CN105018856B - The vertically and horizontally little structural steel for bridge plate of mechanical property difference and its manufacture method - Google Patents
The vertically and horizontally little structural steel for bridge plate of mechanical property difference and its manufacture method Download PDFInfo
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- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 8
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 6
- 241001062472 Stokellia anisodon Species 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 59
- 239000010959 steel Substances 0.000 claims description 59
- 238000003466 welding Methods 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- 239000004484 Briquette Substances 0.000 claims description 5
- 238000003801 milling Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 abstract description 3
- 239000011572 manganese Substances 0.000 description 13
- 239000010955 niobium Substances 0.000 description 13
- 239000010949 copper Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 11
- 229910001566 austenite Inorganic materials 0.000 description 10
- 239000011575 calcium Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 9
- 239000011651 chromium Substances 0.000 description 8
- 239000010936 titanium Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000013078 crystal Substances 0.000 description 4
- 238000001953 recrystallisation Methods 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 241000894007 species Species 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011733 molybdenum Substances 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002308 calcification Effects 0.000 description 1
- 229910052729 chemical element Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical group 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000010813 municipal solid waste Substances 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035900 sweating Effects 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of little structural steel for bridge plate of vertically and horizontally mechanical property difference, its chemical component weight percentage ratio is：C：0.02～0.08%, Si：0.10～0.40%, Mn：0.90～1.50%, P≤0.020%, S≤0.010%, Cu≤0.50%, Ni：0.10～0.40%, Mo：0.30～0.50%, Cr：0.30～0.70%, Nb：0.015～0.030%, V：0.030～0.060%, Ti：0.008～0.025%, Ca≤0.0040%, remaining is Fe and inevitable impurity；Production stage include smelt, casting, heating, rolling and classification control cold.The present invention is with low cost, and process is simple is controlled, and product combination property is good, and vertically and horizontally mechanical property difference is little, can be widely applied to the structures such as LONG-SPAN RAILWAY bridge.
Description
Technical field
The present invention relates to the low-alloy structural steel making field in ferrous metallurgy materials, in particular to one kind vertically and horizontally mechanics
The little structural steel for bridge plate of performance difference and its manufacture method.
Background technology
In steel structure bridge field, due to complex structure, the Impact direction of bridge rod piece is often not limited to former rolled steel
A direction of plate.For the sake of security it is desirable to the vertically and horizontally mechanical property difference of steel plate is less.But, in general,
The impact of collision work(of conventional steel plates will be far above laterally, and longitudinal strength especially yield strength will be far below laterally.Steel plate is thinner,
This species diversity is more obvious, and that is, the mechanical property of steel plate presents obvious anisotropy, brings very to the selection of bridge steel plate
Big difficulty.
Research shows, the anisotropic of mechanical property of steel plate and its chemical composition, inherent texture, fibrous tissue and banding group
Knit etc. relevant.Up to the present, composition and microscopic metallographic structure form pair in yield strength 500MPa level structural steel for bridge plate
There is not been reported for the vertically and horizontally diversity of mechanical property of steel plate.
Therefore, the species of appropriate design carbon and alloying element and content, develops production technology simple and easy to control, by strict
Control each technological parameter, research and develop the little yield strength 500MPa level structural steel for bridge plate of vertically and horizontally mechanical property difference
Have important practical significance.
Content of the invention
It is an object of the invention to overcoming above-mentioned the deficiencies in the prior art, provide a kind of low cost of manufacture, process is simple can
Control, high comprehensive performance, the little structural steel for bridge plate of vertically and horizontally mechanical property difference of yield strength 500MPa level and its system
Make method.
For achieving the above object, the technical solution used in the present invention is：A kind of little bridge of vertically and horizontally mechanical property difference
With structural steel and iron, the chemical composition of steel plate and its percentage by weight are as follows：C：0.02～0.08%, Si：0.10～0.40%,
Mn：0.90～1.50%, P≤0.020%, S≤0.010%, Cu≤0.50%, Ni：0.10～0.40%, Mo：0.30～
0.50%, Cr：0.30～0.70%, Nb：0.015～0.030%, V：0.030～0.060%, Ti：0.008～0.025%,
Ca≤0.0040%, remaining is Fe and inevitable impurity；And meet simultaneously：Carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+
(Ni+Cu)/15≤0.475%, welding crack sensibility indices P cm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+
Mo/15+V/10+5B≤0.23%；Acicular ferrite content >=90% in its metallographic structure.
Further, the chemical composition of steel plate and its percentage by weight are as follows：C：0.04～0.06%, Si：0.10～
0.40%, Mn：0.90～1.50%, P≤0.020%, S≤0.004%, Cu≤0.40%, Ni：0.15～0.20%, Mo：
0.30～0.50%, Cr：0.30～0.70%, Nb：0.015～0.030%, V：0.030～0.060%, Ti：0.008～
0.025%, Ca≤0.0040%, remaining is Fe and inevitable impurity.
Further, the chemical composition of steel plate and its percentage by weight are as follows：C：0.04%, Si：0.25%, Mn：
1.20%, P：0.012%, S：0.002%, Cu：0.20%, Ni：0.15%, Mo：0.35%, Cr：0.45%, Nb：
0.022%, V：0.040%, Ti：0.012%, Ca：0.0025%, remaining is Fe and inevitable impurity.
In the little structural steel for bridge plate of the vertically and horizontally mechanical property difference of the present invention, each composition effect is as follows：
Carbon (C)：Carbon is the effective element improving hardness of steel, and when content is more than 0.08%, after rolling, rate of cooling is larger
When, easily form M/A island, and easy Assembled distribution, on segregation band, causes mechanical property of steel plate to present significantly vertically and horizontally poor
Different；When its content is relatively low, such as less than 0.02%, armor plate strength can be made not enough, also can increase difficulty during smelting simultaneously.Cause
This, control carbon content scope is：0.02～0.08%.
Silicon (Si)：Silicon is conventional deoxidizer, has and admittedly melts invigoration effect, is conducive to improving its combination property, but Si content
When higher, reduce toughness, plasticity and the ductility of steel, be easily caused cold short be unfavorable for weld.Therefore, the present invention is by the content of Si
Desired value controls 0.10～0.40%.
Manganese (Mn)：Manganese is important Strengthening and Toughening element, can increase the stability of austenite, expands γ phase region austenite, promotees
Enter the middle temperature structural transformation of steel.Too high toughness steel billet center segregation being adversely affected, impairing steel plate of Mn content, and
Easily crack during welding, Mn content is too low, middle temperature structural transformation can not be effectively facilitated, be easily reduced the intensity of steel.Therefore
Control Mn content range be：0.90～1.50%.
Phosphorus (P)：Phosphorus is harmful element in steel, and its content will strictly control, and high P content can increase the cold short of steel and incline
To, and P is easily in the center portion segregation of steel billet, due to the high strong segregated zone of this P content more crisp so that easily producing after steel rolling
Raw latent defect.The phosphorus content of the present invention is controlled to P≤0.018%.
Sulfur (S)：Sulfur is harmful element in steel, and high S content not only can make steel plate, and vertically and horizontally performance produces notable difference,
Also reduce its low-temperature flexibility and Z-direction performance simultaneously.Sulfur content of the present invention is S≤0.003%.
Copper (Cu)：Copper can improve its quenching degree in steel, acts primarily as solid solution and precipitation enhancement, in addition with beneficial to obtaining
Obtain low-temperature flexibility well, increase its fatigue crack extended capability；But when its addition is more than 0.40%, the sweating heat of steel plate
Zone of influence toughness can reduce, and steel billet is also easy to produce check crack in heating process.The copper content control of the present invention be Cu≤
0.040%.
Nickel (Ni)：Nickel can improve quenching degree, has certain invigoration effect, can significantly improve its low-temperature flexibility, make base material
Increase substantially with Low Temperature Impact Toughness of Heat-affected Zone, Ni can also effectively stop the hot-short check crack causing of Cu simultaneously.When itself plus
Enter amount and be less than 0.10%, then Ni does not have effect, but too high levels easily cause steel-plate iron oxide scale and are difficult to come off and increase steel
Cost.Ni content of the present invention is：0.10～0.40%.
Molybdenum (Mo)：Molybdenum can make ferrite separate out from austenite and increase the stability of austenite, the formation to pearlite
There is strong inhibition, but Mo belongs to noble element, excessive Mo will improve the cost of steel；Simultaneously too high Mo content
The low-temperature flexibility that steel can be made significantly deteriorates, and forms martensite in welding, leads to welding point fragility to increase.Therefore control in steel
Mo content range is：0.30～0.50%.
Chromium (Cr)：Chromium can improve intensity and the hardness of steel, but its too high levels then easily increases welding difficulty, and content mistake
Low, can not effectively play its effect.In the present invention, the content of Cr is controlled to 0.30～0.70%.
Vanadium (V) and niobium (Nb)：In ultra-low-carbon bainite steel, only add substantial amounts of Nb, be remarkably improved intensity, due to it
Substantially, it is higher to also result in yield tensile ratio, therefore, in the present invention, Nb content is limited in reduced levels, it is strong for grain refinement effect
The loss of degree is then ensured by adding suitable V.In the present invention, the content of V is 0.030～0.060%.Niobium is strong carbon nitridation
Compound forms element, can improve the austenite recrystallization temperature of steel, austenite can be rolled under higher rolling temperature.
In addition precipitation strength effect in controlled rolling continuous cooling process for the Nb, the strain induced precipitate by the carbonitride of Nb can
With pinning austenite crystal, crystal grain thinning simultaneously improves intensity and low-temperature flexibility.But when Nb content is more than 0.030%, crystal grain thinning
Improve the effect of intensity clearly, but also lead to its yield tensile ratio too high；When its content is less than 0.015%, do not play controlled rolling
Effect.Therefore control Nb content range be：0.015-0.030%.
Titanium (Ti)：Titanium is carbide, can form trickle TiC granule, crystal grain thinning, can prevent crystalline substance
Between corrosion phenomenon, improving welding property.Ti content of the present invention is：0.008～0.030%.
Calcium (Ca)：Calcium can make the inclusion balling in steel, improves the toughness plasticity of steel it is often more important that improving the low temperature punching of steel
Hit the anisotropic of toughness.But when Ca content is more than 0.0040%, it is also easy to produce more thick field trash, steel can be deteriorated on the contrary
Performance.Therefore in the present invention, calcium content is controlled to Ca≤0.0040%.
Further, the little structural steel for bridge plate of the vertically and horizontally mechanical property difference of the present invention passes through alloying element species
With the scientific design of content, strictly control each production technology it is achieved that having excellent comprehensive performance and vertically and horizontally poor mechanical property
Different little structural steel for bridge plate, its yield strength ReLFor 500～630MPa, -40 DEG C of impact absorbing energy KV2>=120J, in length and breadth
To yield strength difference Δ ReL＜ 30MPa, -40 DEG C are vertically and horizontally impacted work difference Δ KV2＜ 80J；And have excellent welding performance and
Cold machine-shaping.
The production method of the little structural steel for bridge plate of above-mentioned vertically and horizontally mechanical property difference, comprises the steps：Smelt,
Casting, heating, rolling and classification control are cold；In heating stepses, the heating-up temperature of slab is 1250～1320 DEG C；In milling step,
Control broadening ratio=steel plate width/width of steel billet be 1.4～1.8, the operation of rolling controls in two stages, roughing temperature be 1000～
1230 DEG C, total reduction >=60%, intermediate slab thickness H=finished steel plate thickness h+20～30mm, final rolling temperature be 900～
980℃；Classification is controlled in cold step, and when 740～820 DEG C, control cooldown rate is 1～2 DEG C/s to board briquette；Board briquette exists
When 480～740 DEG C, control cooldown rate is 20～40 DEG C/s；During board briquette≤480 DEG C, using the natural type of cooling cooling
To room temperature.
Further, in described heating stepses, the heating-up temperature of slab is 1280～1300 DEG C.
Further, in described milling step, controlled rolling in two stages, roughing temperature is 1060～1160 DEG C, finish rolling
Temperature is 930～960 DEG C.
Compared with prior art, the present invention has advantages below：The present invention is set up separately using the one-tenth of Mn microalloying in low C
Meter, by heating, rolling, the control process meanses such as cold, Optimizing Process Parameters it is ensured that acicular ferrite content >=90% in steel plate,
Ensure that it has excellent mechanical property, it is 500～630MPa that its performance indications meets yield strength, -40 DEG C of impact absorbing energies
>=120J, vertically and horizontally less than 30MPa, -40 DEG C are vertically and horizontally impacted work difference and are less than 80J yield strength difference, have excellent weldability
Can be with cold machine-shaping, can produce steel plate thickness is 10～60mm, and range of application is the welding structures such as LONG-SPAN RAILWAY bridge.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
The chemical elements in percentage by mass of the steel plate of embodiment of the present invention 1-10 as shown in table 1, balance of Fe and can not
The impurity avoiding.
Various embodiments of the present invention produce according to following steps：
1) smelt and be casting continuously to form to heating strand after base, control heating-up temperature at 1250～1320 DEG C；
2) carry out hot rolling, control broadening ratio=steel plate width/width of steel billet to be 1.4～1.8, and control the roughing temperature to be
1000～1230 DEG C, total reduction >=60%, intermediate slab thickness H=finished steel plate thickness h+20～30mm, final rolling temperature is
900～980 DEG C；
3) classification control is cold：When 740～820 DEG C, control rate of cooling is 1～2 DEG C/s to temperature；Temperature is at 480～740 DEG C
When, control rate of cooling is 25～40 DEG C/s；When temperature is below 480 DEG C, naturally cool to room temperature.
The main production parameter of various embodiments of the present invention is as shown in table 2.
The main technologic parameters list of table 2 various embodiments of the present invention
It should be noted that table 1 and table 2 not corresponding relation, it is only for example.
The performance parameter of various embodiments of the present invention is as shown in table 3.
From table 1, in the present invention, by limiting the interpolation of the element such as Mn, Nb in steel, reduce austenite recrystallization area
Final temperature, weakens ausrolling texture；By properly increasing Mo content, it is easy to obtain acicular ferrite；By using super
Low-sulfur calcification processing is so that the vertically and horizontally difference of low-temperature flexibility is less.
From table 2, in heating process, adopt higher heating-up temperature as far as possible, weaken rolling texture；Meanwhile, exist
During two-stage rolling, as far as possible by reduction distribution in rough rolling step, because rough rolling step is in austenite recrystallization area, here
Stage rolling, can fully weaken rolling texture.With the reduction of thickness of slab, the overall reduction of rough rolling step decreases, but one
As all more than 60%.In the finish rolling stage, total drafts is 20～30mm, because the finish rolling stage is in austenite non-recrystallization
Area, is so the rolling texture in order to reduce the finish rolling stage as far as possible.In the finish rolling stage, also it is in high-temperature region rolling as far as possible,
So can also suitably reduce rolling texture.Between 740～480 DEG C, steel plate gives the cold by force of 25～40 DEG C/s, is so
In order to fully obtain acicular ferrite structure, reduce the difference of steel plate mechanical property in length and breadth further.
From table 3, with the increase of steel plate thickness, the vertically and horizontally difference of mechanical property of steel plate is gradually lowered, and surrender is strong
The vertically and horizontally poor Δ R of degreeeLLess than 30MPa, -40 DEG C are vertically and horizontally impacted work difference Δ KV2Less than 80J.
Above-described embodiment only most preferably enumerates, and is not the restriction to embodiments of the present invention.
The part that other is not described in detail is prior art.
Claims (3)
1. a kind of little structural steel for bridge plate of vertically and horizontally mechanical property difference it is characterised in that：The chemical composition of described steel plate
And its percentage by weight is as follows：C：0.04～0.06%, Si：0.10～0.40%, Mn：0.90～1.50%, P≤0.020%,
S≤0.004%, Cu≤0.40%, Ni：0.15～0.20%, Mo：0.30～0.50%, Cr：0.30～0.70%, Nb：
0.015～0.030%, V：0.030～0.060%, Ti：0.008～0.025%, Ca≤0.0040%, remaining is Fe and can not
Avoid impurity；And meet simultaneously：Carbon equivalent ce V=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.475%,
Welding crack sensibility index
Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B≤0.23%；Pin in its metallographic structure
Columnar ferrite content >=90%；The mechanical property of described steel plate is：Yield strength ReLFor 500～630MPa, -40 DEG C of impact absorbings
Work(KV2>=120J, vertically and horizontally yield strength difference Δ ReL＜ 30MPa, -40 DEG C are vertically and horizontally impacted work difference Δ KV2＜ 80J；And have
Excellent welding performance and cold machine-shaping.
2. the little structural steel for bridge plate of vertically and horizontally mechanical property difference according to claim 1 it is characterised in that：Described
The chemical composition of steel plate and its percentage by weight are as follows：C：0.04%, Si：0.25%, Mn：1.20%, P：0.012%, S：
0.002%, Cu：0.20%, Ni：0.15%, Mo：0.35%, Cr：0.45%, Nb：0.022%, V：0.040%, Ti：
0.012%, Ca：0.0025%, remaining is Fe and inevitable impurity.
3. the production method of the little structural steel for bridge plate of the vertically and horizontally mechanical property difference described in a kind of claim 1, it is special
Levy and be：Comprise the steps：Smelt, cast, heating, rolling and classification control is cold；In described heating stepses, the heating temperature of slab
Spend for 1280～1300 DEG C；In described milling step, broadening ratio=steel plate width/width of steel billet is controlled to be 1.4～1.8, rolling
Process controls in two stages, and roughing temperature is 1060～1160 DEG C, total reduction >=60%, intermediate slab thickness H=finished steel
Plate thickness h+20～30mm, final rolling temperature is 930～960 DEG C；Described classification is controlled in cold step, and board briquette is at 740～820 DEG C
When, control cooldown rate is 1～2 DEG C/s；When 480～740 DEG C, control cooldown rate is 20～40 DEG C/s to board briquette；Plate
During base temperature≤480 DEG C, room temperature is cooled to using the natural type of cooling.
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| CN107502705A (en) * | 2017-07-26 | 2017-12-22 | 舞阳钢铁有限责任公司 | A kind of production method for controlling ultra-thick plate performance difference in a thickness direction |
| CN110863139B (en) * | 2019-10-31 | 2021-05-28 | 鞍钢股份有限公司 | 420MPa grade weathering bridge steel resistant to ultra-low temperature impact and production method |
| CN111926256B (en) * | 2020-08-12 | 2021-11-23 | 宝武集团鄂城钢铁有限公司 | Ultra-wide non-anisotropic steel plate with width larger than or equal to 3500mm and production method thereof |
| CN114182165A (en) * | 2021-10-29 | 2022-03-15 | 南京钢铁股份有限公司 | Low-yield-ratio high-toughness Q500qE bridge steel and production method thereof |
| CN114381663A (en) * | 2021-12-16 | 2022-04-22 | 南阳汉冶特钢有限公司 | 100 mm-thick HPS420WZ35 weather-resistant bridge plate and production method for ensuring performance thereof |
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|---|---|---|---|---|
| JPH10237583A (en) * | 1997-02-27 | 1998-09-08 | Sumitomo Metal Ind Ltd | High tensile steel and method for producing the same |
| CN101845602B (en) * | 2009-03-26 | 2012-04-25 | 宝山钢铁股份有限公司 | High-performance weather-proof building structural steel and manufacturing method thereof |
| JP5833964B2 (en) * | 2012-03-29 | 2015-12-16 | 株式会社神戸製鋼所 | Steel sheet excellent in bending workability, impact property and tensile property, and method for producing the same |
| CN103627980B (en) * | 2013-11-25 | 2016-01-20 | 首钢总公司 | Low temperature large wall thickness X80HD gross distortion pipe line steel and production method thereof |
| CN104342600B (en) * | 2014-10-28 | 2017-01-11 | 武汉钢铁(集团)公司 | Medium-thickness steel plate for non-normalized bridge and preparation method thereof |
| CN104831181A (en) * | 2015-03-27 | 2015-08-12 | 武汉钢铁(集团)公司 | Liquefied petroleum gas (LPG) marine storage tank steel plate and making method thereof |
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Effective date of registration: 20180111 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Co-patentee after: CHINA RAILWAY CORPORATION Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Co-patentee before: CHINA RAILWAY CORPORATION Patentee before: Wuhan Iron & Steel (Group) Corp. |