CN110205542A - A kind of cold roll tool steel and preparation method thereof - Google Patents
A kind of cold roll tool steel and preparation method thereof Download PDFInfo
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- CN110205542A CN110205542A CN201910428880.5A CN201910428880A CN110205542A CN 110205542 A CN110205542 A CN 110205542A CN 201910428880 A CN201910428880 A CN 201910428880A CN 110205542 A CN110205542 A CN 110205542A
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- 229910001315 Tool steel Inorganic materials 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 51
- 239000010959 steel Substances 0.000 claims abstract description 51
- 238000009749 continuous casting Methods 0.000 claims abstract description 16
- 238000007670 refining Methods 0.000 claims abstract description 13
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 9
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 9
- 229910052797 bismuth Inorganic materials 0.000 claims abstract description 9
- 229910052745 lead Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 9
- 229910052718 tin Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 241001417490 Sillaginidae Species 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 3
- 238000006477 desulfuration reaction Methods 0.000 claims description 3
- 230000023556 desulfurization Effects 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 238000013021 overheating Methods 0.000 claims 1
- 238000010891 electric arc Methods 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 238000010080 roll forging Methods 0.000 abstract description 2
- 238000009849 vacuum degassing Methods 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 9
- 239000000126 substance Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 4
- 238000005275 alloying Methods 0.000 description 3
- 239000011651 chromium Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005242 forging Methods 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002929 anti-fatigue Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a kind of cold roll tool steel and preparation method thereof, the composition of the tool steel is by weight percent are as follows: C:0.80~0.86%, Si:0.30~0.50%, Mn:0.60~0.90%, P :≤0.015%, S :≤0.005%, Cr:4.80%~5.20%, Mo:0.20~0.50%, Ni:0.10~0.50%, Cu :≤0.20%, V:0.05~0.10%, As :≤0.020%, Sn :≤0.020%, Pb :≤0.0025%, Sb :≤0.025%, Bi :≤0.005%, [O]≤12ppm, [N]≤70ppm, [H]≤1.5ppm, remaining is Fe With inevitable impurity.It is smelted using UHP uhp electric arc furnace, LF external refining, VD vacuum degassing treatment tech, continuous casting circle slab produces steel.Using cold roll forging made from the round billet after the completion of final heat treatment, there is excellent depth of hardening zone, hardenability and wearability, metallographic structure is uniform, tiny.
Description
Technical field
The invention belongs to tool steel technical fields, and in particular to a kind of metallurgical roller tool steel and preparation method thereof.
Background technique
With the continuous bar of the large quantities of modernizations in China, high-speed rod, seamless steel pipe, H profile steel, heavy and medium plate mill and it is cold,
The construction of hot strip continuous-rolling machine is gone into operation, and the technology of China's Steel-rolling Industry and equipment have striden into the international rank of advanced units.
The raising of rolling mill level, steel rolling serialization, high speed, enlargement and the realization of full-automation propose material, the quality of roll
Tightened up requirement out, the heavy forgings such as roll constantly develop to high performance, high-quality, enlargement and high-alloying direction,
Requirements at the higher level are proposed to the control of smelting, casting, forging technology and quality.
For a long time, cold roll or super-huge support roll are usually vacuum with high-carbon high-alloy tool steel material
Deaerate steel ingot or ESR ingot.Metallurgical technology development, as the blank that roll manufactures is one in particular by continuous casting round bloom
Important innovations direction.
The present invention is directed to high-carbon high-alloy cold roll tool steel metallurgical technology feature and quality requirement, passes through the alloy of steel
Change and design and manufacture technology, provides a kind of tool steel and preparation method thereof.
Summary of the invention
The present invention provides a kind of cold roll tool steel and preparation method thereof, based on 9Cr5Mo steel, add Ni, V
Element；Gas content in P, S, As, Sn, Pb, Sb, Bi harmful element content and steel in strict control steel；The present invention also provides
The continuous casting process preparation method of steel, the tool steel of production depth of hardening zone with higher, hardness and wearability, resist it is accident
The good feature of energy, the internal soundness of steel meet cold roll manufacture and require.
In order to achieve the above objectives, The technical solution adopted by the invention is as follows:
A kind of cold roll tool steel, is designed and technical process control by reasonable ingredient, guarantees the quench-hardened case of material
The performance requirements such as depth, hardness and wearability, anti-accident.Its chemical component mass percent are as follows: C:0.80~0.86%, Si:
0.30~0.50%, Mn:0.60~0.90%, P :≤0.015%, S :≤0.005%, Cr:4.80%~5.20%, Mo:
0.20~0.50%, Ni:0.10~0.50%, Cu :≤0.20%, V:0.05~0.10%, As :≤0.020%, Sn :≤
0.020%, Pb :≤0.0025%, Sb :≤0.025%, Bi :≤0.005%, [O]≤12ppm, [N]≤70ppm, [H]≤
1.5ppm, remaining is Fe and inevitable impurity.
One of technical characterstic of the invention is the ingredient design of steel.Based on 9Cr5Mo steel, Ni, V element are added；Sternly
Lattice control in steel gas content in P, S, As, Sn, Pb, Sb, Bi harmful element content and steel.5% chromium cold roll does not need weight
It quenches, and effective depth of hardening can reach 40mm or more, wearability and anti-accident are functional.For improve depth of hardening zone and
Contact fatigue life reduces quench-hardened case brittleness and superheated susceptivity, has carried out optimization of Chemical Composition design, increases Mo, V in steel
Or the elements such as Ni, the effect of Mo are the harden ability to increase roll, significantly improve the intensity of steel, eliminate roll temper brittleness；V's
Effect be for refine crystal grain, guarantee matrix in contain a large amount of Dispersed precipitates spherical MC type carbide, but V be not easy it is excessively high；Mo,V
The increase of content causes to contain more retained austenite in steel after quenching, most of after tempering to be changed into martensite again, in this way
Roll hardness is helped to improve, wearability is enhanced and reduces abrasion surface roughness.Harmful element P, S in steel, As, Sn, Pb, Sb,
Bi can improve the brittle transition temperature of steel, deteriorate the low temperature impact properties of steel, P in strict control steel of the present invention :≤0.015%,
S :≤0.005%, As :≤0.020%, Sn :≤0.020%, Pb :≤0.0025%, Sb :≤0.025%, Bi :≤
0.005%；In steel gas content can cleanliness, hydrogen induced cracking to steel adversely affect, to guarantee the reliability of steel and interior
Portion's quality controls [O]≤12ppm, [N]≤70ppm, [H]≤1.5ppm in steel.
On the basis of above-mentioned optimization design, for the performance stable and consistent for guaranteeing steel, it is preferred that the composition of steel presses quality percentage
Number are as follows:
Its chemical component mass percent are as follows: C:0.81~0.83%, Si:0.40~0.50%, Mn:0.70~
0.80%, P :≤0.015%, S :≤0.005%, Cr:4.90%~5.00%, Mo:0.40~0.45%, Ni:0.15~
0.20%, Cu :≤0.10%, V:0.08~0.10%, As :≤0.020%, Sn :≤0.020%, Pb :≤0.0025%, Sb:
≤ 0.025%, Bi :≤0.005%, [O]≤9ppm, [N]≤70ppm, [H]≤1.5ppm, remaining is for Fe and inevitably
Impurity.
The two of technical characterstic of the invention are reasonable production technology, replace original mould using continuous casting round bloom technology generations
The recovery rate of steel can be improved in caststeel ingot technique, reduces energy consumption, produces more environmentally-friendly energy conservation, cost is greatly reduced.Separately
Outside, continuous casting process improves the cleanliness of steel, ensure that the anti-fatigue performance of steel, meets roll great surface quality and anti-thing
Therefore performance requirement.
The Design of Chemical Composition of a kind of preparation method of cold roll tool steel, steel requires as described above, including following step
It is rapid:
1) it smelts
Using electric furnace smelting, electric furnace smelting feed stock for blast furnace is that low copper, low-phosphorous high-quality steel scrap and molten iron, molten iron proportion be not small
In 70%.Electric furnace smelting uses big quantity of slag depth decarburization to reinforce de- P removal operation, has made foamed slag, has controlled terminal [C]: 0.20
~0.40%, [P]≤0.005%, residual element content meets design requirement；Control tapping temperature 1640~1690 DEG C it
Between, it to guarantee that alloy sufficiently melts, and creates good conditions for subsequent refining process, alloy amount is added extremely as far as possible in electric furnace steel tapping
Chemical component lower limit, ladle alloying pay attention to using low-phosphorous alloy.
2) it refines
It controls basicity of slag and is greater than 5.0, refining process is kept for the white slag time be greater than 20 minutes, reinforces desulfurization operations, refining
Aluminum steel, range of the Holo-Al content control 0.020~0.035% are fed before sample of furnace.Before LF tapping, according to 1.5~3.5m/
T steel feeds calcium line and carries out calcium Metamorphism treatment.
It is vacuum-treated after refining, the measurement of process hydrogen is carried out with hydrogen determinator, hydrogen content is not more than 1.5ppm, and vacuum degree is less than
67Pa, retention time are greater than 27 minutes, and soft argon blowing time 20~30 minutes after VD, when soft blow argon forbids exposed molten steel and big argon gas
Amount stirring cooling.
3) it is poured
UsingStandard round billet continuous casting slab uses M-EMS in continuous casting.Control tundish
15~30 DEG C of the liquid steel temperature degree of superheat, 0.15~0.20m/min of pulling rate, to guarantee slab quality.
Detailed description of the invention
Fig. 1 is the macrostructure figure of embodiment 1.
Specific embodiment
Any feature is disclosed to obtain in this specification, it unless specifically stated, can be equivalent or with similar purpose by other
Alternative features are replaced.Unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.It is described to understand the present invention just for the sake of help, it should not be considered as to concrete restriction of the invention.
With the drawings and specific embodiments, the present invention is described in further detail below.
Embodiment 1-3:
A kind of tool steel and preparation method thereof.Using UHP uhp electric arc furnace, LF external refining, VD Fruit storage
Technique is smelted, and continuous casting circle slab produces steel.Embodiment is come specifically with the production technology of Φ 800mm standard round billet
How the bright present invention is implemented.
Production technology is as follows:
1) it smelts
Using electric furnace smelting, electric furnace smelting feed stock for blast furnace is that low copper, low-phosphorous high-quality steel scrap and molten iron, molten iron proportion be not small
In 70%.Electric furnace smelting uses big quantity of slag depth decarburization to reinforce de- P removal operation, has made foamed slag, has controlled terminal [C]: 0.27
~0.30%, [P]≤0.005%, residual element content meets design requirement；Control tapping temperature 1670~1680 DEG C it
Between, it to guarantee that alloy sufficiently melts, and creates good conditions for subsequent refining process, alloy amount is added extremely as far as possible in electric furnace steel tapping
Chemical component lower limit, ladle alloying pay attention to using low-phosphorous alloy.
2) it refines
It controls basicity of slag and is greater than 5.0, refining process is kept for the white slag time be greater than 25 minutes, reinforces desulfurization operations, refining
Aluminum steel, range of the Holo-Al content control 0.022~0.030% are fed before sample of furnace.Before LF tapping, according to 1.8~2.2m/
T steel feeds calcium line and carries out calcium Metamorphism treatment.
It is vacuum-treated after refining, the measurement of process hydrogen is carried out with hydrogen determinator, hydrogen content is not more than 1.5ppm, and vacuum degree is less than
67Pa, retention time are greater than 27 minutes, and soft argon blowing time 20~30 minutes after VD, when soft blow argon forbids exposed molten steel and big argon gas
Amount stirring cooling.
3) it is poured
UsingStandard round billet continuous casting slab uses M-EMS in continuous casting.Control tundish
It 17~25 DEG C of the liquid steel temperature degree of superheat, 0.16~0.17m/min of pulling rate, to guarantee slab quality, is madeSpecification circle
Base.
Using cold roll forging made from embodiment 1-3 after the completion of final heat treatment, have excellent depth of hardening zone,
Hardenability and wearability, metallographic structure are uniform, tiny.
Table 1 is the chemical component of embodiment, and table 2 is molten steel in bakie in continuous casting temperature, drawing speed, and table 3 is that embodiment is low
It organizes again, Fig. 1 is the macrograph of embodiment 1.Table 4 is embodiment non-metallic inclusion, and table 5 is that roll physics is made in embodiment
Performance.
1 embodiment chemical component of table (mass percent, %)
2 molten steel in bakie in continuous casting temperature of table, drawing speed
| Embodiment | Molten steel in bakie in continuous casting temperature, DEG C | Continuous casting drawing speed, m/min |
| 1 | 1466 | 0.17 |
| 2 | 1468 | 0.17 |
| 3 | 1470 | 0.17 |
3 round billet macroscopic examination result of table
4 examination of nonmetallic inclusion result of table
The comparison of 5 physical property technical indicator of table
| Project | Depth of hardening zone/mm | Wearability (weightless g) |
| Embodiment | 50 | 0.08 |
| International advanced index | ≥40 | > 0.10 |
Technological parameter (such as temperature, time) section bound value of the invention and interval value can realize this law,
Embodiment numerous to list herein.
Ordinary skill in the art knowledge can be used in the unspecified content of the present invention.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (3)
1. a kind of cold roll tool steel, which is characterized in that the composition of the tool steel is by weight percent are as follows:
C:0.80~0.86%, Si:0.30~0.50%, Mn:0.60~0.90%, P :≤0.015%, S :≤0.005%,
Cr:4.80%~5.20%, Mo:0.20~0.50%, Ni:0.10~0.50%, Cu :≤0.20%, V:0.05~0.10%,
As :≤0.020%, Sn :≤0.020%, Pb :≤0.0025%, Sb :≤0.025%, Bi :≤0.005%, [O]≤12ppm,
[N]≤70ppm, [H]≤1.5ppm, remaining is Fe and inevitable impurity.
2. cold roll tool steel according to claim 1, which is characterized in that the composition of the tool steel presses quality percentage
Number are as follows:
C:0.81~0.83%, Si:0.40~0.50%, Mn:0.70~0.80%, P :≤0.015%, S :≤0.005%,
Cr:4.90%~5.00%, Mo:0.40~0.45%, Ni:0.15~0.20%, Cu :≤0.10%, V:0.08~0.10%,
As :≤0.020%, Sn :≤0.020%, Pb :≤0.0025%, Sb :≤0.025%, Bi :≤0.005%, [O]≤9ppm,
[N]≤70ppm, [H]≤1.5ppm, remaining is Fe and inevitable impurity.
3. the preparation method of cold roll tool steel of any of claims 1 or 2, the preparation method comprises the following steps:
1) it smelts
Using electric furnace smelting, electric furnace smelting feed stock for blast furnace is that low copper, low-phosphorous high-quality steel scrap and molten iron, molten iron proportion are not less than
70%, electric furnace smelting uses big quantity of slag depth decarburization to reinforce de- P removal operation, has made foamed slag, has controlled terminal [C]: 0.20~
0.40%, [P]≤0.005%, residual element content meets design requirement；Tapping temperature is controlled between 1640~1690 DEG C；
2) it refines
It controls basicity of slag and is greater than 5.0, refining process is kept for the white slag time be greater than 20 minutes, reinforces desulfurization operations, refining furnace one
Aluminum steel, range of the Holo-Al content control 0.020~0.035% are fed before secondary sample；Before LF tapping, according to 1.5~3.5m/t steel
It feeds calcium line and carries out calcium Metamorphism treatment；
It is vacuum-treated after refining, hydrogen content is not more than 1.5ppm, and vacuum degree is less than 67Pa, and the retention time is greater than 27 minutes, after VD
Soft argon blowing time 20~30 minutes；
3) it is poured
UsingStandard round billet continuous casting slab uses M-EMS in continuous casting, controls Metal in Tundish
15~30 DEG C of temperature overheating degree, 0.15~0.20m/min of pulling rate.
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Cited By (4)
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| CN113462971A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Hot-working die large round billet and preparation method thereof |
| CN113564487A (en) * | 2021-07-16 | 2021-10-29 | 鞍钢股份有限公司 | High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method thereof |
| CN115216586A (en) * | 2022-05-31 | 2022-10-21 | 中钢集团邢台机械轧辊有限公司 | Smelting method of steel for cold roll |
| WO2023000479A1 (en) * | 2021-07-20 | 2023-01-26 | 山东钢铁股份有限公司 | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113462971A (en) * | 2021-06-21 | 2021-10-01 | 山东钢铁股份有限公司 | Hot-working die large round billet and preparation method thereof |
| CN113564487A (en) * | 2021-07-16 | 2021-10-29 | 鞍钢股份有限公司 | High-surface-hardness tool steel with excellent 800MPa electroplating performance and production method thereof |
| CN113564487B (en) * | 2021-07-16 | 2022-05-17 | 鞍钢股份有限公司 | A kind of high surface hardness tool steel with excellent 800MPa electroplating performance and production method |
| WO2023000479A1 (en) * | 2021-07-20 | 2023-01-26 | 山东钢铁股份有限公司 | Hot-rolled, low-temperature-resistant, h-shaped steel with grade of yield strength of 420 mpa, and preparation method therefor |
| CN115216586A (en) * | 2022-05-31 | 2022-10-21 | 中钢集团邢台机械轧辊有限公司 | Smelting method of steel for cold roll |
| CN115216586B (en) * | 2022-05-31 | 2023-10-20 | 中钢集团邢台机械轧辊有限公司 | Smelting method of steel for cold roll |
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Application publication date: 20190906 |