CN105779898B - A kind of cold work die steel plate and its manufacture method - Google Patents

A kind of cold work die steel plate and its manufacture method Download PDF

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Publication number
CN105779898B
CN105779898B CN201410821878.1A CN201410821878A CN105779898B CN 105779898 B CN105779898 B CN 105779898B CN 201410821878 A CN201410821878 A CN 201410821878A CN 105779898 B CN105779898 B CN 105779898B
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China
Prior art keywords
steel
steel plate
heating
temperature
cold work
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CN201410821878.1A
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Chinese (zh)
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CN105779898A (en
Inventor
李广龙
赵坦
范刘群
王勇
原思宇
李文斌
李黎明
钟莉莉
胡海洋
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鞍钢股份有限公司
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Abstract

The present invention provides a kind of cold work die steel plate, and steel plate composition is as follows by weight percentage:C:1.0 1.35%, Si:0.7 1.0%, Mn:0.4 0.5%, Cr:9.0 10.5%, Mo:0.7 1.0%, V:0.6 1.0%, B:0.001 0.0012%, P<0.03,S<0.03, surplus is Fe and inevitable impurity.Manufacture method:Casting gained steel ingot, which is put into heating furnace, to be heated, and heating process heats for two benches, and multi- pass rolling obtains rolled plate, 1,050 1100 DEG C of start rolling temperature, 850 930 DEG C of finishing temperature, total reduction 60 85%;The steel plate slow cooling of rolling, the complete steel plate of slow cooling is quenched and is tempered.The toughness of steel is improved by reducing the content of C element in steel, simultaneously, by adding, cheap B element further improves the quenching degree of steel, obtain a kind of cold work die steel plate coordinated with higher hardness with toughness, its hardness meets or exceeds Cr12 type cold work die steels, and toughness is higher than Cr12 type cold work die steels.

Description

A kind of cold work die steel plate and its manufacture method
Technical field
The invention belongs to metal material production technical field, more particularly to a kind of cold work die steel plate and its manufacture method.
Background technology
Mould is the basis of industrial development, is that the batch production of realization of industrialization product and new-product development institute are indispensable Shaping jig.Mould steel can be divided into cold work die steel, hot die steel and plastic die steel according to its purposes and condition of work, Cold work die steel is mainly used in carrying out the mould of workpiece compacting, cold drawn, punch forming etc. under cold state.High-alloy cold-working mould Steel is the preferred material of high-precision high life cold-working mould, predominantly Cr12 types cold work die steel, and the serial cold work die steel is High carbon and chromium mould steel, this kind of mould steel capital has high hardness, intensity and wearability, but is due to that phosphorus content is higher, therefore Cause its eutectic carbide inhomogeneities serious, make mould impact flexibility poor, easy embrittlement.And traditional production Cr12 type cold-workings The technique of mould steel includes:Electric furnace smelting-refining-ingot casting-ingot casting annealing-heating-forging-heat treatment after forging, causes it Production cost is higher, complex process shortcoming.There is problem for more than, generate some patents for improving disadvantage mentioned above.
《A kind of cold work die steel and preparation method thereof》(application number:201210545009.1), the invention provides one kind Cold work die steel, reduces the content of carbon in steel on the basis of Cr12 type mould steel, the steel has that wearability is good, hardness is high, The small advantage of heat treatment deformation.But the invention with the addition of wolfram element in steel, cause production cost to increase.
《A kind of preparation method of cold working die steel material》(application number:201310289985.X), the invention by fusing, Oxidation, detection alloying component and adjust, refine, casting, be heat-treated etc. process obtain with preferable intensity and toughness coordinate it is cold Make mould steel.But the Technology for Heating Processing of the patent is more complicated, including the subzero treatment process such as 0 DEG C of water and liquid nitrogen, cause production Cost increase.
《A kind of cold work die steel in high alloy through》(application number:200810121969.9), the invention passes through electric arc furnace smelting-pour The note process such as steel ingot-forging-stress relief annealing-cutting-storage obtains a kind of hardness and toughness reach Cr12MoV in Cr12 types, Cr12Mo1V1 mould steel, but the carbon content of the steel is higher, up to 2.5%, will certainly reduce mould steel toughness, Increase the embrittlement tendency of mould steel.
Contrast above prior art and understand that the manufacture of current cold work die steel is primarily present following deficiency.
(1) carbon content is higher in steel, causes eutectic carbide inhomogeneities serious, makes its impact flexibility poor, easy embrittlement.
(2) other noble elements are with the addition of, cause production cost to increase.
(3) complex manufacturing, production cost is higher.
The content of the invention
A kind of cold-working with higher-strength and toughness is provided it is an object of the invention to overcome above mentioned problem and deficiency Mould steel plate and its manufacture method, its hardness meet or exceed Cr12 type cold work die steels, and toughness is higher than Cr12 type cold-workings Mould steel.
What the object of the invention was realized in:
A kind of cold work die steel plate, the composition of the steel plate is as follows by weight percentage:C:1.0-1.35%, Si:0.7- 1.0%, Mn:0.4-0.5%, Cr:9.0-10.5%, Mo:0.7-1.0%, V:0.6-1.0%, B:0.001-0.0012%, P< 0.03,S<0.03, surplus is Fe and inevitable impurity.
Composition of steel design reason of the present invention is as follows:
C:High carbon content can ensure to form substantial amounts of alloy carbide, during Quench heating, and a part is dissolved in austenite, Its stability is improved, while also increasing the alloying element content in martensite, it is ensured that its hardness, and not molten carbide then rises Crystal grain thinning, the effect for improving toughness, and improve the wearability of steel;But it when carbon content is too high, can increase carbide inhomogeneities Plus, have a strong impact on its toughness.It is 1.0-1.35% that present invention selection, which adds scope,.
Si:The essential elements of deoxidation in steel making, solid solution ability is stronger in steel, can play certain invigoration effect;In work In mould steel, with the increase of Si contents, eutectic carbide is become large-sized, increasing number, and post-curing ability is improved, content mistake Height can seriously reduce the toughness of steel.It is 0.7-1.0% that present invention selection, which adds scope,.
Mn:Appropriate Mn can delay steel grade ferrite and pearlite to change, and steel grade quenching degree is significantly increased, and improve impact Toughness.It is 0.4-0.5% that present invention selection, which adds scope,.
Cr:Chromium can increase the quenching degree of steel, improve temper resistance, and produce post-curing phenomenon;Chromium strong carbon in being Compound formation element, carbide can be formed in steel with carbon, also dissolved in solid solution and Fe3C;With chromium in high-carbon steel The raising of content, the carbide content of formation and the amount increase for dissolving in matrix, so that the intensity of steel becomes big with wearability;But When too high levels, excessive ledeburite eutectic and bulk carbide is easily formed.It is 9.0- that present invention selection, which adds scope, 10.5%.
Mo:Molybdenum can improve the quenching degree of steel, heat resistance in steel, prevent temper brittleness, increase anti-temper softening ability, Post-curing effect can be produced in high tempering, carbide stability is improved, the toughness of steel can be improved and improved wear-resisting Property, it can also strengthen age hardening effect in the case where there is chromium addition.It is 0.7-1.0% that present invention selection, which adds scope,.
V:Vanadium is carbide, and VC is formed in steel, can improve the plasticity and toughness of steel with crystal grain thinning, V is the principal element for improving wearability in mould steel.But V content is too high to reduce the grindability of mould steel.It is comprehensive Consider, it is 0.6-1.0% that present invention selection, which adds scope,.
B:Boron can improve matrix quenching degree;Martensite substructure is refined, matrix toughness is improved;In annealing process, Gu Molten B vector preferablies secondary compound is separated out, and increases secondary precipitation thing quantity, improves Me (C, B) form, improves material homogeneity;B Austenite is solid-solution in, matrix high-temperature yield strength is reduced, the heat deformability of matrix is improved, rolling or forge crack is reduced.But It is that eutectic boride is unfavorable to the toughness of steel, and is unfavorable for thermal deformation.It is 0.001-0.0012% that present invention selection, which adds scope,.
A kind of cold work die steel board fabrication method, including smelt, cast, heating stove heat, rolling, heat treatment,
(1) steel of mentioned component is smelted using vacuum melting furnace, the molten steel for smelting completion is cast into steel ingot;
(2) gained steel ingot in (1) is put into heating furnace and heated, heating process heats for two benches, the first stage It is heated to 700-800 DEG C, 50-100 DEG C of programming rate/h, soaking time 0.5-2h;Second stage is heated to 1100-1200 DEG C, 50-100 DEG C of programming rate/h, is incubated 2-4h;
(3) steel ingot completed will be heated and obtains rolled plate, 1050-1100 DEG C of start rolling temperature, finish to gauge temperature through multi- pass rolling 850-930 DEG C of degree, total reduction 60-85%;
(4) steel plate after the completion of rolling is subjected to slow cooling, 700-800 DEG C of slow cooling start temperature, temperature retention time is more than 24h;
(5) steel plate after the completion of slow cooling is heat-treated, Technology for Heating Processing is as follows:
A) quench, heating technique is two-stage heat, the first stage is heated to 800-850 DEG C, 50-100 DEG C of programming rate/ H, soaking time 1-2h;Second stage is heated to 950-1050 DEG C, 50-100 DEG C of programming rate/h, soaking time 1-3h;Quenching The type of cooling uses oil cooling, is cooled to oil temperature;
B) it is tempered, 380-450 DEG C of temperature, soaking time 1-3h.
The beneficial effects of the present invention are:The toughness of steel is improved by reducing the content of C element in steel, meanwhile, by adding Plus cheap B element further improves the quenching degree of steel, a kind of cold-working mould coordinated with higher hardness with toughness is finally given Has steel plate, its hardness meets or exceeds Cr12 type cold work die steels, and toughness is higher than Cr12 type cold work die steels.
Brief description of the drawings
Fig. 1 is steel embodiment metallographic structure figure of the present invention.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention is smelted, cast, heating stove heat, rolling, at heat according to the component proportion of technical scheme Reason.The chemical composition of steel of the embodiment of the present invention is shown in Table 1.The heating technique of steel ingot of the embodiment of the present invention is shown in Table 2.The embodiment of the present invention Steel ingot rolling mill practice is shown in Table 3 with retarded cooling process.Steel plate heat treatment process of the embodiment of the present invention is shown in Table 4.Steel plate of the embodiment of the present invention Mechanical properties test the results are shown in Table 5.
The chemical composition (wt%) of the embodiment of the present invention of table 1
Embodiment C Si Mn Cr Mo V B P S
1 1.05 0.95 0.5 10.5 1.0 0.98 0.0011 0.028 0.015
2 1.21 0.9 0.43 9.7 0.8 0.75 0.0012 0.025 0.018
3 1.33 0.7 0.41 9.2 0.7 0.62 0.001 0.029 0.009
4 1.35 0.82 0.45 9.4 0.9 0.8 0.0011 0.024 0.014
5 1.15 0.9 0.48 9.5 0.8 0.9 0.001 0.023 0.017
The heating technique of the steel ingot of table 2
The steel ingot rolling mill practice of table 3 and retarded cooling process
The steel plate heat treatment process of table 4
The mechanical property of steel plate assay of table 5
Embodiment Hardness/HRC Impact flexibility/J
1 59 60
2 60 70
3 62 61
4 58 75
5 60 68

Claims (1)

1. a kind of manufacture method of cold work die steel plate, it is characterised in that the composition of the steel plate is as follows by weight percentage:C: 1.0-1.35%, Si:0.7-1.0%, Mn:0.4-0.5%, Cr:9.0-10.5%, Mo:0.7-1.0%, V:0.6-1.0%, B:0.001-0.0012%, P<0.03,S<0.03, surplus is Fe and inevitable impurity;
The manufacture method, including smelt, cast, heating stove heat, rolling, heat treatment, (1) is by the steel of mentioned component using true Empty smelting furnace is smelted, and the molten steel for smelting completion is cast into steel ingot;
(2) gained steel ingot in (1) is put into heating furnace and heated, heating process heats for two benches, first stage heating To 700-800 DEG C, 50-100 DEG C of programming rate/h, soaking time 0.5-2h;Second stage is heated to 1100-1200 DEG C, heating 50-100 DEG C of speed/h, is incubated 2-4h;
(3) steel ingot completed will be heated and obtains rolled plate, 1050-1100 DEG C of start rolling temperature, finishing temperature through multi- pass rolling 850-930 DEG C, total reduction 60-85%;
(4) steel plate after the completion of rolling is subjected to slow cooling, 700-800 DEG C of slow cooling start temperature, temperature retention time is more than 24h;
(5) steel plate after the completion of slow cooling is heat-treated, Technology for Heating Processing is as follows:
A) quench, heating technique is two-stage heat, the first stage is heated to 800-850 DEG C, and 50-100 DEG C of programming rate/h is protected Warm time 1-2h;Second stage is heated to 950-1050 DEG C, 50-100 DEG C of programming rate/h, soaking time 1-3h;Quenching cooling Mode uses oil cooling, is cooled to oil temperature;
B) it is tempered, 380-450 DEG C of temperature, soaking time 1-3h.
CN201410821878.1A 2014-12-23 2014-12-23 A kind of cold work die steel plate and its manufacture method CN105779898B (en)

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CN106191706A (en) * 2016-08-16 2016-12-07 安徽瑞泰新材料科技有限公司 A kind of corrosion-resistant impact-resistant abrasion-proof steel ball and preparation method thereof
CN106282510A (en) * 2016-08-25 2017-01-04 瑞安市劲力机械制造有限公司 The forging of Cr12 steel mold and Technology for Heating Processing
CN108396247A (en) * 2017-02-05 2018-08-14 鞍钢股份有限公司 A kind of high strength and low cost toughness cold working die steel plate and its production method
CN106862649B (en) * 2017-03-30 2018-08-28 安徽锋利锐刀片制造有限公司 A kind of high-precision disc rolling shearing blade and its manufacturing method
CN107460408B (en) * 2017-09-04 2019-04-30 东北大学 Strong TRIP steel of a kind of 1.5GPa grades or more of superelevation and preparation method thereof
CN108161367B (en) * 2018-01-17 2019-11-19 昆山腾荣机械有限公司 A kind of new-energy automobile light durable motor casing manufacturing process
CN108690935B (en) * 2018-06-11 2019-08-06 鞍钢股份有限公司 A kind of high-quality alloy tool steel plate and production method
CN109504899B (en) * 2018-12-05 2020-07-17 鞍钢股份有限公司 Plastic die steel and preparation method thereof

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CN101709427A (en) * 2009-11-26 2010-05-19 上海大学 Low-cost, high-strength, high-toughness and high-abrasion resistance cold-working die steel and preparation method thereof
CN102477516A (en) * 2010-11-26 2012-05-30 浙江黄岩冲模厂 Novel cast die steel and manufacture method thereof
CN102719758A (en) * 2012-06-25 2012-10-10 山东理工大学 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

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CN101709427A (en) * 2009-11-26 2010-05-19 上海大学 Low-cost, high-strength, high-toughness and high-abrasion resistance cold-working die steel and preparation method thereof
CN102477516A (en) * 2010-11-26 2012-05-30 浙江黄岩冲模厂 Novel cast die steel and manufacture method thereof
CN102719758A (en) * 2012-06-25 2012-10-10 山东理工大学 Anti-oxidation and anti-thermal fatigue hot working die steel and manufacturing method thereof

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