CN107620010A - A kind of low yield strength ratio high tenacity high manganese steel sheet and its production method - Google Patents
A kind of low yield strength ratio high tenacity high manganese steel sheet and its production method Download PDFInfo
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- 229910000617 Mangalloy Inorganic materials 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 175
- 239000010959 steel Substances 0.000 claims abstract description 175
- 238000005096 rolling process Methods 0.000 claims abstract description 95
- 238000010438 heat treatment Methods 0.000 claims abstract description 80
- 238000009749 continuous casting Methods 0.000 claims abstract description 57
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000009628 steelmaking Methods 0.000 claims abstract description 25
- 239000011572 manganese Substances 0.000 claims abstract description 23
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 21
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 20
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 19
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 230000009467 reduction Effects 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 35
- 229910001566 austenite Inorganic materials 0.000 claims description 32
- 239000002893 slag Substances 0.000 claims description 27
- 238000005266 casting Methods 0.000 claims description 26
- 238000001953 recrystallisation Methods 0.000 claims description 25
- 238000005275 alloying Methods 0.000 claims description 18
- 238000005516 engineering process Methods 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 13
- 229910008455 Si—Ca Inorganic materials 0.000 claims description 12
- 244000309464 bull Species 0.000 claims description 12
- 230000014759 maintenance of location Effects 0.000 claims description 12
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 238000010583 slow cooling Methods 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims 2
- 238000003466 welding Methods 0.000 abstract description 11
- 229910052799 carbon Inorganic materials 0.000 abstract description 7
- 238000013461 design Methods 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 3
- 239000010955 niobium Substances 0.000 description 19
- 239000011651 chromium Substances 0.000 description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 239000000243 solution Substances 0.000 description 13
- 239000000047 product Substances 0.000 description 12
- 238000012545 processing Methods 0.000 description 11
- 239000011265 semifinished product Substances 0.000 description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910000592 Ferroniobium Inorganic materials 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- ZFGFKQDDQUAJQP-UHFFFAOYSA-N iron niobium Chemical compound [Fe].[Fe].[Nb] ZFGFKQDDQUAJQP-UHFFFAOYSA-N 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 238000005496 tempering Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000604 Ferrochrome Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 239000011574 phosphorus Substances 0.000 description 1
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Abstract
The invention discloses a kind of low yield strength ratio high tenacity high manganese steel sheet and its production method, the steel plate chemical composition composition and its weight/mass percentage composition are：C：0.30~0.40%, Si：0.20~0.40%, Mn：23.50~25.50%, Cr：3.0~4.0%, Al：0.020~0.040%, Nb：0.020~0.040%, P≤0.008%, S≤0.003%, surplus are Fe and inevitable impurity.Plate Production method of the present invention includes steel-making, continuous casting, heating, rolling and heat treatment step.Design of Chemical Composition of the present invention uses C, Mn, Cr solution strengthening, gained steel plate has consistency height, intensity rank is higher, elongation percentage is high, the features such as yield tensile ratio is low and low-temperature impact toughness is excellent, the requirement of low yield strength ratio high tenacity high manganese steel sheet is disclosure satisfy that, there is good combination property and welding performance, and cost is relatively low.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of low yield strength ratio high tenacity high manganese steel sheet and its producer
Method.
Background technology
At present more than pressure vessel low-temperature steel plate and ultralow temperature steel plate based on nickel steel, normalizing or normalizing+tempering or quenched
State is delivered goods, and such as 3.5Ni, 5Ni or 9Ni steel, nickel is main alloy element in steel, using normalizing or normalizing+tempering or quenched shape
State is delivered goods.Nickel steel needs the nickel resources of a large amount of preciousnesses to carry out alloying during the manufacturing, therefore resource consumption pressure is big,
Corresponding production cost remains high.Therefore be badly in need of developing a kind of new ultra-low temperature surroundings steel plate materialses, continuous casting and
The steel plate should have good low-temperature impact toughness, reduce nickel content dosage, so as to effectively reduce production cost.For above-mentioned
Problem, the present invention develop a kind of low yield strength ratio high tenacity high manganese steel sheet and its production method.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of low yield strength ratio high tenacity high manganese steel sheet；The present invention also carries simultaneously
A kind of production method of low yield strength ratio high tenacity high manganese steel sheet is supplied.
In order to solve the above technical problems, the present invention adopts the technical scheme that：A kind of low yield strength ratio high tenacity high manganese steel sheet,
The steel plate chemical composition composition and its weight/mass percentage composition are：C：0.30~0.40%, Si：0.20~0.40%, Mn：23.50
~25.50%, Cr：3.0~4.0%, Al：0.020~0.040%, Nb：0.020~0.040%, P≤0.008%, S≤0.003%,
Surplus is Fe and inevitable impurity.
The mechanism of action of each component of the present invention and content is：
C：Carbon is most important element in steel, and C, which is dissolved in gamma ferrite, forms a kind of interstitial solid solution, in face-centered cubic knot
Structure, stable austenite tissue, surrender, tensile strength on steel, welding performance make a significant impact；Carbon can be shown by gap solid solution
Write and improve armor plate strength, but carbon content is too high, can influence the welding performance and toughness of steel again, carbon content is too low then to reduce the strong of steel
Degree.
Si：Reducing agent and deoxidier are used as in steelmaking process, while Si can also play solution strengthening effect, but exceed
When 0.5%, the toughness of steel can be caused to decline, reduce the welding performance of steel.
Mn：It is most important alloying element in material of the present invention that manganese, which is, as a kind of element for effectively expanding austenite, manganese
The critical transition temperature of austenite is down to below room temperature, steel is kept austenite structure at room temperature；Cost is cheap simultaneously, energy
Increase toughness, intensity and the hardness of steel, improve the hot-working character of steel；Manganese amount is too high, can weaken the resistance to corrosion of steel, reduces
Welding performance.
P、S：In general, p and ses are all harmful elements in steel, increase the fragility of steel.Phosphorus becomes welding performance
It is bad, plasticity is reduced, cold-bending property is degenerated；Sulphur reduces the ductility and toughness of steel, and crackle is caused in forging and rolling；Therefore
Should be tried one's best the content for reducing p and ses in steel.
Al：Aluminium is the deoxidier commonly used in steel.A small amount of aluminium is added in steel, can crystal grain thinning, improve impact flexibility.Aluminium is also
With inoxidizability and corrosion resistance, too high hot-working character, welding performance and the machinability for then influenceing steel.
Nb：The crystal grain refinement for being added to promote steel rolling microscopic structure of niobium, can improve intensity and toughness simultaneously；Niobium
Can be in During Controlled Rolling by suppressing the effective refinement microstructure of austenite recrystallization, and pass through precipitation strength matrix.Niobium can
Reduce the superheated susceptivity and temper brittleness of steel.In welding process, the Ovshinsky when segregation of niobium atom and precipitation can hinder to heat
The roughening of body crystal grain, and obtain relatively fine heat affected area tissue, improving welding property after ensureing welding.
Cr：There is very big invigoration effect to steel, improve intensity, hardness and wearability, reduce the critical cooling rate of steel.
The maximum gauge of steel plate of the present invention is 30mm.
Steel plate yield strength >=300MPa of the present invention, tensile strength 700-860MPa, elongation percentage A50 >=40%, -196
DEG C side knock work(is average >=100J.
Present invention also offers a kind of production method of low yield strength ratio high tenacity high manganese steel sheet, the production method includes refining
Steel, continuous casting, heating, rolling and heat treatment step；The rolling process, using two-stage rolling mill practice.
Rolling process of the present invention, using two-stage rolling mill practice；First stage is the austenite recrystallization stage, open rolling
Temperature is 1050~1100 DEG C, and finishing temperature is 920~950 DEG C, and single pass rolling reduction is 10~30%, and it is 30 to add up reduction ratio
~50%.
Rolling process of the present invention, second stage are the austenite non-recrystallization stage, start rolling temperature≤900 DEG C, optimal
For 870~900 DEG C, finishing temperature is 830~880 DEG C；Single pass reduction ratio is 10~30%, and it is 30~50% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product.
Continuous casting working procedure of the present invention, the molten steel after smelting is subjected to continuous casting, electromagnetic agitation or slighter compress are carried out during continuous casting,
It is cold by force to strengthen solidification end, obtains continuous casting billet；10~25 DEG C of molten steel overheat, casting speed are 0.85~1.00min/mm, even
Casting process is cast using low overheat and mould flux, and casting cycle coordinates dynamic soft reduction technology, continuous casting billet stacking slow cooling
≥72h。
Heating process of the present invention, continuous casting billet heat in continuous-type furnace, maximum heating temperature 1130~1150
DEG C, 1110~1130 DEG C of holding temperature, total heat time >=12min/mm steel billet thickness, steel billet thickness is 200~330mm.
Heat treatment step of the present invention, solution heat treatment is carried out to finished steel plate, and heat treatment temperature is 980~1020
DEG C, heat insulating coefficient 1.8-2.3min/mm, water cooling of coming out of the stove to room temperature.
Steel making working procedure of the present invention, molten steel first pass through just furnace and smelted, using the increase quantity of slag and multiple stream slag, in favor of de-
P, 1610~1650 DEG C of tapping temperature；LF stove refinings are carried out after taking off Slag treatment, Mn, Cr, Nb alloying are completed, using ferro-niobium and chromium
Iron carries out Nb and Cr alloyings, metal alloying of manganese, bull ladle VD stove applications of vacuum during big bag temperature≤1550 DEG C；At VD stove vacuum
Feed aluminum steel and Si-Ca lines during reason into molten steel, vacuum≤66Pa during application of vacuum, the vacuum retention time >=15min,
Solve the higher phenomenon of molten steel nonmetallic inclusionsin steel content, ensure the degree of purity of molten steel.
The present invention and its design concept of method are：Manganese element and nickel element have similar characteristic in some aspects, such as
Both it is soluble in ferrite and austenite, expands austenitic area, both of which makes the reduction of critical-temperature A3 points,（α+γ) under area
Move.The present invention makes steel plate embody austenite structure characteristic at room temperature, with the center of area by manganese element and other alloy collective effects
Based on cubic lattice, avoid or mitigate the crisp phenomenon of steel plate low temperature turn, therefore steel grade of the present invention can use in the range of extremely low temperature.
Because phase transition phenomena is not present in austenitic steel in heating process, therefore the change steel plate of Technology for Heating Processing by a relatively large margin can not be passed through
Mechanical property, it is therefore desirable to composition reasonable in design, using continuous casting process, ensure steel by rational technique in the operation of rolling
The lumber recovery and performance of plate, while pass through heat treatment process uniform formation.
Low yield strength ratio high tenacity high manganese steel sheet method for testing performance of the present invention refers to ASTM A370 and ASTM A751.
It is using beneficial effect caused by above-mentioned technical proposal：1st, the present invention uses C, Mn, Cr solution strengthening；Add
A small amount of Nb plays a part of dispersion-strengthened action and precipitation strength with crystal grain thinning, its carbonitride；Mn still expands simultaneously
The element of austenite phase field, while carbide is not formed with carbon, so as to ensure that the fully austenitic structure of steel plate.2nd, Chinese manganese money
Source is enriched, cheap, and the present invention substitutes nickel element using manganese element and rationally designs composition and proportioning, so as to effectively reduce
Cost of material.3rd, steel plate obtained by the inventive method has consistency high, and intensity rank is higher, elongation percentage A50 >=40%, Qu Qiang
It is more excellent than low and low-temperature impact toughness, -196 DEG C of AKV >=100J, the features such as degree of purity is higher, composition is uniform, interior solid, energy
Enough meet the requirement of inexpensive ultralow temperature steels for pressure vessel use, there is good combination property and welding performance, and cost is relatively low,
Low-temperature pressure container is can be widely used for, is had a extensive future.4th, steel of the present invention is purer, P≤0.008%, S≤0.003%；Steel
Plate moderate strength, yield tensile ratio are low；- 196 DEG C of low-temperature good toughness；Elongation percentage is high；Steel plate maximum gauge can reach 30mm.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
The production method of low yield strength ratio high tenacity high manganese steel sheet of the present invention includes steel-making, continuous casting, heating, rolling and heat treatment
Process, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, in favor of taking off P, tapping temperature
1610~1650 DEG C；Take off and LF stove refinings carried out after Slag treatment, complete Mn, Cr, Nb alloying, using ferro-niobium and ferrochrome carry out Nb and
Cr alloyings, carry out metal alloying of manganese point several times, bull ladle VD stove applications of vacuum during big bag temperature≤1550 DEG C；VD stove vacuum
Feed aluminum steel and Si-Ca lines in processing procedure into molten steel, vacuum≤66Pa during application of vacuum, the vacuum retention time >=
15min, solve the higher phenomenon of molten steel nonmetallic inclusionsin steel content, ensure the degree of purity of molten steel；
（2）Continuous casting working procedure：Molten steel after smelting is subjected to continuous casting, electromagnetic agitation or slighter compress are carried out during continuous casting, strengthens solidification end
End is strong cold, obtains continuous casting billet；10~25 DEG C of molten steel overheat, casting speed are 0.85~1.00min/mm, and casting process uses
Low overheat is cast and mould flux, and casting cycle coordinates dynamic soft reduction technology, continuous casting billet stacking slow cooling >=72h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1130~1150 DEG C of maximum heating temperature, holding temperature
1110~1130 DEG C, total heat time >=12min/mm steel billet thickness, steel billet thickness is 200~330mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1050
~1100 DEG C, finishing temperature is 920~950 DEG C, and single pass rolling reduction is 10~30%, and it is 30~50% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, start rolling temperature≤900 DEG C, most preferably 870 DEG C~900 DEG C, finishing temperature
For 830~880 DEG C；Single pass reduction ratio is 10~30%, and it is 30~50% to add up reduction ratio；Semi-finished product steel plate is obtained after rolling,
Roll rear ACC and be air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 980~1020 DEG C, is incubated 1.8-
2.3min/mm, water cooling of coming out of the stove to room temperature.
Embodiment 1
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 12mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1625 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1550 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 25min during application of vacuum；
（2）Continuous casting working procedure：20 DEG C, casting speed 0.85min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 78h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1150 DEG C of maximum heating temperature, 1130 DEG C of holding temperature,
Total heat time 12min/mm steel billet thickness；Steel billet thickness is 200mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1050
DEG C, finishing temperature is 930 DEG C, single pass rolling reduction 10%, and it is 40% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 900 DEG C of start rolling temperature, finishing temperature is 850 DEG C；Single pass reduction ratio is
12%, it is 45% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 980 DEG C, is incubated 2.2min/mm, goes out
Stove water cooling is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 2
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 25mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1630 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1545 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 25min during application of vacuum；
（2）Continuous casting working procedure：15 DEG C, casting speed 0.88min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 80h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1150 DEG C of maximum heating temperature, 1125 DEG C of holding temperature,
Total heat time 12min/mm steel billet thickness；Steel billet thickness is 200mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1050
DEG C, finishing temperature is 930 DEG C, single pass rolling reduction 10%, and it is 40% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 900 DEG C of start rolling temperature, finishing temperature is 850 DEG C；Single pass reduction ratio is
12%, it is 45% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1000 DEG C, is incubated 2.0min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 3
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 30mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1630 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1545 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 25min during application of vacuum；
（2）Continuous casting working procedure：20 DEG C, casting speed 0.86min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 75h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1150 DEG C of maximum heating temperature, 1130 DEG C of holding temperature,
Total heat time 12min/mm steel billet thickness；Steel billet thickness is 300mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1050,
Finishing temperature is 935 DEG C, single pass rolling reduction 10%, and it is 40% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 900 DEG C of start rolling temperature, finishing temperature is 845 DEG C；Single pass reduction ratio is
12%, it is 45% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1020 DEG C, is incubated 1.9min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 4
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 15mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1610 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1540 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 20min during application of vacuum；
（2）Continuous casting working procedure：10 DEG C, casting speed 1.00min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 75h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1140 DEG C of maximum heating temperature, 1120 DEG C of holding temperature,
Total heat time 13min/mm steel billet thickness；Steel billet thickness is 200mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1070
DEG C, finishing temperature is 930 DEG C, single pass rolling reduction 15%, and it is 35% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 870 DEG C of start rolling temperature, finishing temperature is 830 DEG C；Single pass reduction ratio is
30%, it is 50% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1010 DEG C, is incubated 2.1min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 5
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 18mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1625 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1550 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 22min during application of vacuum；
（2）Continuous casting working procedure：20 DEG C, casting speed 0.90min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 72h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1145 DEG C of maximum heating temperature, 1120 DEG C of holding temperature,
Total heat time 12.5min/mm steel billet thickness；Steel billet thickness is 200mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1060
DEG C, finishing temperature is 940 DEG C, single pass rolling reduction 10%, and it is 30% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 885 DEG C of start rolling temperature, finishing temperature is 840 DEG C；Single pass reduction ratio is
15%, it is 40% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 990 DEG C, is incubated 2.2min/mm, goes out
Stove water cooling is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 6
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 20mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1630 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1540 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 20min during application of vacuum；
（2）Continuous casting working procedure：25 DEG C, casting speed 0.85min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 72h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1130 DEG C of maximum heating temperature, 1110 DEG C of holding temperature,
Total heat time 15min/mm steel billet thickness；Steel billet thickness is 200mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1100
DEG C, finishing temperature is 950 DEG C, single pass rolling reduction 15%, and it is 45% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 880 DEG C of start rolling temperature, finishing temperature is 880 DEG C；Single pass reduction ratio is
20%, it is 35% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1010 DEG C, is incubated 2.1min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 7
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 26mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1635 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1545 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 20min during application of vacuum；
（2）Continuous casting working procedure：22 DEG C, casting speed 0.86min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 72h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1135 DEG C of maximum heating temperature, 1120 DEG C of holding temperature,
Total heat time 14min/mm steel billet thickness；Steel billet thickness is 300mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1080
DEG C, finishing temperature is 940 DEG C, single pass rolling reduction 30%, and it is 50% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 890 DEG C of start rolling temperature, finishing temperature is 860 DEG C；Single pass reduction ratio is
10%, it is 40% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1020 DEG C, is incubated 1.9min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 8
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 28mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1650 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1545 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 66Pa, vacuum retention time 23min during application of vacuum；
（2）Continuous casting working procedure：20 DEG C, casting speed 0.86min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 72h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1140 DEG C of maximum heating temperature, 1120 DEG C of holding temperature,
Total heat time 13min/mm steel billet thickness；Steel billet thickness is 300mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1090
DEG C, finishing temperature is 945 DEG C, single pass rolling reduction 20%, and it is 40% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 890 DEG C of start rolling temperature, finishing temperature is 870 DEG C；Single pass reduction ratio is
10%, it is 30% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1010 DEG C, is incubated 2.3min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
Embodiment 9
The thickness of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is 8mm, the steel plate chemical composition composition and its quality hundred
Point content is shown in Table 1.
The production method of the present embodiment low yield strength ratio high tenacity high manganese steel sheet is included at steel-making, continuous casting, heating, rolling and heat
Science and engineering sequence, concrete technology step are as described below：
（1）Steel making working procedure：Molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, 1630 DEG C of tapping temperature；Skim
LF stove refinings are carried out after processing, complete Mn, Cr, Nb alloying, bull ladle VD stove applications of vacuum during 1540 DEG C of big bag temperature；VD stoves are true
Feed aluminum steel and Si-Ca lines during the reason of vacancy into molten steel, vacuum 60Pa, vacuum retention time 15min during application of vacuum；
（2）Continuous casting working procedure：18 DEG C, casting speed 0.85min/mm of molten steel overheat, casting cycle coordinate dynamic soft-reduction skill
Art, continuous casting billet stacking slow cooling 76h；
（3）Heating process：Continuous casting billet heats in continuous-type furnace, 1140 DEG C of maximum heating temperature, 1120 DEG C of holding temperature,
Total heat time 13min/mm steel billet thickness；Steel billet thickness 330mm；
（4）Rolling process：Using two-stage rolling mill practice；First stage is the austenite recrystallization stage, start rolling temperature 1100
DEG C, finishing temperature is 920 DEG C, single pass rolling reduction 25%, and it is 45% to add up reduction ratio；
Second stage is the austenite non-recrystallization stage, and 885 DEG C of start rolling temperature, finishing temperature is 860 DEG C；Single pass reduction ratio is
25%, it is 40% to add up reduction ratio；
Semi-finished product steel plate is obtained after rolling, rear ACC is rolled and is air-cooled to room temperature and produce steel plate finished product；
（5）Heat treatment step：Solution heat treatment is carried out to finished steel plate, heat treatment temperature is 1000 DEG C, is incubated 1.8min/mm,
Water cooling of coming out of the stove is to room temperature.
Low yield strength ratio high tenacity high manganese steel sheet performance obtained by the present embodiment is shown in Table 2.
The embodiment 1-9 steel plates chemical composition of table 1 forms and content（wt%）
In table 1, composition surplus is Fe and inevitable impurity.
The embodiment 1-9 low yield strength ratio high tenacity high manganese steel sheet properties of product of table 2
Above example is only to illustrative and not limiting technical scheme, although entering with reference to above-described embodiment to the present invention
Go detailed description, it will be understood by those within the art that：Still the present invention can be modified or equally replaced
Change, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover will in right of the invention
Ask among scope.
Claims (10)
1. a kind of low yield strength ratio high tenacity high manganese steel sheet, it is characterised in that the steel plate chemical composition composition and its quality percentage
Content is：C：0.30~0.40%, Si：0.20~0.40%, Mn：23.50~25.50%, Cr：3.0~4.0%, Al：0.020~
0.040%, Nb：0.020~0.040%, P≤0.008%, S≤0.003%, surplus are Fe and inevitable impurity.
A kind of 2. low yield strength ratio high tenacity high manganese steel sheet according to claim 1, it is characterised in that the maximum of the steel plate
Thickness is 30mm.
3. a kind of low yield strength ratio high tenacity high manganese steel sheet according to claim 1, it is characterised in that the steel plate surrender is strong
Degree >=300MPa, tensile strength 700-860MPa, elongation percentage A50 >=40%, -196 DEG C of side knock work(are average >=100J.
4. based on a kind of production method of low yield strength ratio high tenacity high manganese steel sheet described in claim 1-3 any one, it is special
Sign is that the production method includes steel-making, continuous casting, heating, rolling and heat treatment step；The rolling process, using second order
Section rolling mill practice.
5. the production method of a kind of low yield strength ratio high tenacity high manganese steel sheet according to claim 4, it is characterised in that described
Rolling process, using two-stage rolling mill practice；First stage is the austenite recrystallization stage, and start rolling temperature is 1050~1100
DEG C, finishing temperature is 920~950 DEG C, and single pass rolling reduction is 10~30%, and it is 30~50% to add up reduction ratio.
6. the production method of a kind of low yield strength ratio high tenacity high manganese steel sheet according to claim 4, it is characterised in that described
Rolling process, second stage are the austenite non-recrystallization stage, start rolling temperature≤900 DEG C, most preferably 870~900 DEG C, finish to gauge temperature
Spend for 830~880 DEG C；Single pass reduction ratio is 10~30%, and it is 30~50% to add up reduction ratio；Rerolled steel is obtained after rolling
Plate, rolls rear ACC and is air-cooled to room temperature and produce steel plate finished product.
7. a kind of production method of low yield strength ratio high tenacity high manganese steel sheet according to claim 4-6 any one, it is special
Sign is that the continuous casting working procedure, 10~25 DEG C of molten steel overheat, casting speed is 0.85~1.00min/mm, and casting cycle is matched somebody with somebody
Close dynamic soft reduction technology, continuous casting billet stacking slow cooling >=72h.
8. a kind of production method of low yield strength ratio high tenacity high manganese steel sheet according to claim 4-6 any one, it is special
Sign is that the heating process, continuous casting billet heats in continuous-type furnace, 1130~1150 DEG C of maximum heating temperature, insulation
1110~1130 DEG C of temperature, total heat time >=12min/mm steel billet thickness, steel billet thickness are 200~330mm.
9. a kind of production method of low yield strength ratio high tenacity high manganese steel sheet according to claim 4-6 any one, it is special
Sign is, the heat treatment step, solution heat treatment is carried out to finished steel plate, and heat treatment temperature is 980~1020 DEG C, insulation system
Number 1.8-2.3min/mm, water cooling of coming out of the stove to room temperature.
10. a kind of production method of low yield strength ratio high tenacity high manganese steel sheet according to claim 4-6 any one, it is special
Sign is, the steel making working procedure, and molten steel first passes through just furnace and smelted, using the increase quantity of slag and multiple stream slag, tapping temperature 1610~
1650℃；Take off and LF stove refinings are carried out after Slag treatment, complete Mn, Cr, Nb alloying, bull ladle VD stoves are true during big bag temperature≤1550 DEG C
Manage in vacancy；Feed aluminum steel and Si-Ca lines in VD stove vacuum process into molten steel, vacuum≤66Pa during application of vacuum, very
The empty retention time >=15min.
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| CN110117695A (en) * | 2019-05-10 | 2019-08-13 | 舞阳钢铁有限责任公司 | A kind of smelting process of LNG ship potassium steel |
| WO2020085861A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent shape, and manufacturing method therefor |
| WO2020085858A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent shape, and manufacturing method therefor |
| WO2020085864A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent corrosion resistance, and manufacturing method therefor |
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| KR102255826B1 (en) | 2018-10-25 | 2021-05-26 | 주식회사 포스코 | Ultra-low temperature austenitic high manganese steel having excellent shape and manufacturing method for the same |
| WO2020085858A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent shape, and manufacturing method therefor |
| WO2020085864A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent corrosion resistance, and manufacturing method therefor |
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| KR20200047318A (en) * | 2018-10-25 | 2020-05-07 | 주식회사 포스코 | Ultra-low temperature austenitic high manganese steel having excellent shape and manufacturing method for the same |
| WO2020085861A1 (en) * | 2018-10-25 | 2020-04-30 | 주식회사 포스코 | Cryogenic austenitic high-manganese steel having excellent shape, and manufacturing method therefor |
| US12221680B2 (en) | 2018-10-25 | 2025-02-11 | Posco Co., Ltd | Cryogenic austenitic high-manganese steel having excellent corrosion resistance, and manufacturing method therefor |
| EP3872210A4 (en) * | 2018-10-25 | 2021-09-01 | Posco | Cryogenic austenitic high-manganese steel having excellent shape, and manufacturing method therefor |
| CN112930415A (en) * | 2018-10-25 | 2021-06-08 | 株式会社Posco | Austenitic high manganese steel material for ultra-low temperature use excellent in shape and method for producing same |
| CN112912529A (en) * | 2018-10-25 | 2021-06-04 | 株式会社Posco | Austenitic high manganese steel material for ultra-low temperature use excellent in shape and method for producing same |
| EP3872214A4 (en) * | 2018-10-25 | 2021-09-01 | Posco | High manganese steel having excellent oxygen cutting properties, and manufacturing method therefor |
| CN110117695A (en) * | 2019-05-10 | 2019-08-13 | 舞阳钢铁有限责任公司 | A kind of smelting process of LNG ship potassium steel |
| CN113290060A (en) * | 2021-05-18 | 2021-08-24 | 广西柳州钢铁集团有限公司 | Production rhythm control method of hot continuous rolling mill |
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