CN100482842C - High malleable high wear-resisting cold process mould steel - Google Patents

High malleable high wear-resisting cold process mould steel Download PDF

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Publication number
CN100482842C
CN100482842C CNB2007100614022A CN200710061402A CN100482842C CN 100482842 C CN100482842 C CN 100482842C CN B2007100614022 A CNB2007100614022 A CN B2007100614022A CN 200710061402 A CN200710061402 A CN 200710061402A CN 100482842 C CN100482842 C CN 100482842C
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China
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steel
wear
malleable
mould
resisting cold
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CN100999802A (en
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张占普
吴立志
马党参
刘建华
陈再枝
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Heye Sci & Tech Co Ltd
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Heye Sci & Tech Co Ltd
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Abstract

The present invention relates to one kind of high toughness and high wear resistance cold-work die steel, which includes C 0.95-1.15 wt%, Si 0.20-1.20 wt%, Cr 6.50-8.00 wt%, Mo 1.00-2.00 wt%, V 1.80-2.60 wt%, W 0.50-1.50 wt%, Nb 0.10-1.00 wt%, Mn 0.20-0.50 wt%, and Fe and impurity for the rest. The cold-work die steel has high wear resistance, high strength, high toughness, high hardness, high tempering stability and other features, and may be used in replacing M2 high speed die steel for lowering cost.

Description

High malleable high wear-resisting cold process mould steel
Technical field
The present invention relates to a kind of cold-work die steel, especially a kind of high malleable high wear-resisting cold process mould steel.
Background technology
Mould is to boost productivity, and reduces materials consumption, reduces cost, and improves the quality of products and the important means of the market competitiveness.Along with industrial technology constantly advances, require mould harsher, more use under the high speed working conditions, require the precision of mould more and more higher, work-ing life is more and more longer.Present domestic die steel has reached about 400,000 tons, but because of reasons such as kind, quality, homemade die steel can't meet the demands, about 80,000 tons/year of a large amount of importers outer mold steel.The production of new steel grade and usage quantity and kind all seldom only account for 2~3% of die steel output perennate.
The high toughness wear resistant steel has many trades mark, is the new steel grade of domestic development as 7Cr7Mo2V2Si (LD), 9Cr6W3Mo2V (GM), Cr8MoV2Ti, 80Cr7Mo3W2V etc.DC53, ASSAB-88, CRU-WEAR, QCM8, LEXCOWEAR, Vertex, PGK, VascoDIE, TCD, CPM3V etc. are the new trade mark of external development.In the high alloy instrument steel scrap, contain alloying elements such as a large amount of W, Mo, Cr, V simultaneously, some the composition design of above-mentioned new steel grade does not contain W (as LD, Cr8MoV2Ti, DC53, ASSAB-88, QCM8, Vertex, VascoDIE, TCD, CPM3V), makes that the steel scrap utilization of resources is restricted on producing; Some good toughness and wear resistance deficiency (as LD, DC53 etc.); Some C and alloying element proportioning are not too reasonable, the waste alloying element, and hardness is higher and toughness is relatively poor, can not give full play to its effect, narrow application range.
A kind of microalloy high tenacity cold-work die steel is disclosed as Chinese invention patent CN94113823.2, its chemical ingredients is C:0.5~0.9%, Mn:0.5~1.5%, Si:0.5~1.4%, Mo:0.1~0.5%, V:0.1~0.5%, Nb:0.008~0.2%, Ti:0.01~0.1%, S≤0.035%, P≤0.035%, surplus are iron.After adopting such technical scheme, its hardness reaches HRC58~62, impelling strength is greater than 30J, but owing to do not contain W in this die steel, therefore, utilization to the steel scrap resource on producing is restricted, cost is higher, and V, Nb, C do not obtain good cooperation, makes its hardness, toughness and wear resistance lower slightly, over-all properties is slightly poor, more and more can not satisfy the requirement that modern manufacturing industry is more and more higher to the mould and die accuracy requirement, work-ing life is more and more longer.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides and a kind ofly can make full use of resource, effectively reduce production cost, optimize the proportioning between each composition, make it have high-ductility, high-wearing feature, thereby improve the high malleable high wear-resisting cold process mould steel in work-ing life.
For achieving the above object, high malleable high wear-resisting cold process mould steel of the present invention, comprise in this die steel by weight percentage: C:0.95~1.15%, Si:0.20~1.20%, Cr:6.50~8.00%, Mo:1.00~2.00%, V:1.80~2.60%, W:0.50~1.50%, Nb:0.10~1.00%, Mn:0.20~0.50%, surplus are iron and impurity.
As further improvement in the technical proposal, the weight percent of content sum in this die steel of Nb and V is 2.5~3.0% in this die steel.
Wherein, the weight percent of each composition is in the above-mentioned impurity: P≤0.03%, S≤0.01%.
Die steel of the present invention adopts traditional smelting process production, promptly passes through: intermediate frequency+esr → steel ingot → fast is forged, precise forging machine distortion → square billet → milling train is become a useful person → annealed → finishing → produce all size forging rolling material.
After adopting technique scheme, this die steel chemical ingredients has following characteristics:
(1) consider W, Mo, V alloy element proportioning from wear resistance: contain 1.80~2.60%V, conventional production methods is near upper limit 3.0%V, and unlikelyly makes smeltings, deformation processing too difficult for the carbide homogeneity that guarantees steel; 0.50~1.50%W is that the alloying of assisting cooperates with 1.00~2.00%Mo based on Mo, with W, accomplish under the situation of identical carbide amount, less its toughness of alloy total amount is better, has solved a large amount of tool steel steel scraps simultaneously and has contained the resource limit that W, Mo are fully utilized simultaneously.
(2) according to alloying principle, C=0.033W+0.063Mo+0.060Cr+0.2V+0.13Nb carries out carbon content control, effectively brings into play the effect of alloying element.
(3) 1%Si does not form carbide in steel, but strengthens matrix, and intensity and toughness are higher.
(4) add Nb: add more Nb (0.1~1.0%), when especially making the content sum of Nb and V guarantee between 2.5%~3.0%, Nb except that play the microalloying effect as: crystal grain thinning, improve thermostability, recover matrix toughness, tempering more the intensive age hardening effect etc., more Nb and C form NbC, playing the forming core effect makes carbide more even, instead of part V increases more wear-resisting carbide NbC quantity, makes that the steel wear resistance is higher; Annealing hardness can be lower, helps cold machine-shaping; The continuous curve C curve moves to left, and makes the crack sensitivity of steel lower, more helps the control of steel production slow cooling crackle; Nb reserves in the whole world are very abundant in addition, and the Nb-Fe market value is quite stable also, than the cheap resource that makes full use of of V-Fe.
The performance index of this high malleable high wear-resisting cold process mould steel are 1090~1150 ℃ of quenchings, and standard tests such as GB GB/T230, GB/T14452, GB/T229 are pressed in 540 ℃ * 1h * 3 times tempering, and are as shown in the table:
Performance Index
Hardness, HRC 60~65
Bending strength σ bb,MPa 4000~4800
Non-notch impelling strength α k,J/cm 2 70~140
Ultimate compression strength σ bc,MPa 3500~3800
Wear resistance Be higher than D2 near M2
In sum, high malleable high wear-resisting cold process mould steel of the present invention is compared with existing high toughness wear resistant cold-work die steel, has high-wearing feature more, high obdurability; High hardness and high temper resistance are more suitable in postorder coating or nitriding treatment; Can make full use of resource reduces cost; Because over-all properties is all good, the mould scope of applicable making is wide, and alternative D2, GM, LD class steel die improves its toughness and wear resistance improves the life-span greatly; Alternative part M2 high speed steel mould when keeping its life-span, reduces its material cost greatly, is convenient to cold machine-shaping reduction Mould Machining cost.During problems such as not wear-resisting, the poor toughness tipping that uses under solving heavy shock loads, working speed height, high precision and long service life particular surroundings especially that mould exists, fracture, more can show its superiority.
Embodiment
Below in conjunction with concrete embodiment the present invention is done further to describe in detail:
The smelting starting material of embodiment steel are: rapid steel, die steel returns, technically pure iron, ferrotungsten, molybdenum-iron, ferrochrome, vanadium iron, ferro-niobium etc., through 3 tons of intermediate frequency+esr → steel ingots → fast forge, precise forging machine distortion → square billet → milling train becomes a useful person → anneals → finishing → φ 45mm round steel is the finished product material.
To embodiment steel sampling having carried out heat treatment performance experiment, it detects and experimental result is listed in the table below:
???? HYC3 Quenching temperature Tempering process The tempered-hardness of quenching HRC α k?? ????? J/cm 2 σ bb???? MPa?
Embodiment 1125℃ 540 ℃ * 1h * 3 times 63.5 90 4600
With the hexagon bolt cutting die that the embodiment steel is done, 1110 ℃ of quenchings are adopted in thermal treatment, 550 ℃ of three tempering, and hardness 62HRC, the contrast experiment that cuts edge, experimental result:
Test unit: Yuyao shake reaches Seiko mould company limited

Claims (3)

1, a kind of high malleable high wear-resisting cold process mould steel, it is characterized in that this die steel comprises by weight percentage: C:0.95~1.15%, Si:0.20~1.20%, Cr:6.50~8.00%, Mo:1.00~2.00%, V:1.80~2.60%, W:0.50~1.50%, Nb:0.10~1.00%, Mn:0.20~0.50%, surplus is iron and impurity.
2, high malleable high wear-resisting cold process mould steel according to claim 1 is characterized in that: the weight percent of content sum in this die steel of Nb and V is 2.5~3.0% in this die steel.
3, high malleable high wear-resisting cold process mould steel according to claim 1 and 2 is characterized in that the weight percent of each composition in the described impurity is: P≤0.03%, S≤0.01%.
CNB2007100614022A 2007-01-05 2007-01-05 High malleable high wear-resisting cold process mould steel Expired - Fee Related CN100482842C (en)

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CN100482842C true CN100482842C (en) 2009-04-29

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CN102397994A (en) * 2010-09-10 2012-04-04 上海汇众汽车制造有限公司 Mold
CN102126120B (en) * 2011-04-08 2012-10-03 安徽省凌锋冶金机械有限公司 Method for producing upper and lower blades of edge cutting machine
CN102653837A (en) * 2012-02-24 2012-09-05 宝山钢铁股份有限公司 High-toughness wear-resistant cold-working die steel and preparation method thereof
CN103233168B (en) * 2013-05-08 2015-04-29 安泰科技股份有限公司 Powder metallurgy high-toughness cold-work mould steel and preparation method thereof
CN103290328A (en) * 2013-05-30 2013-09-11 钢铁研究总院 High-niobium, high-wear-resistance and high-toughness cold-work die steel
CN104060197A (en) * 2014-07-01 2014-09-24 南通志邦新材料科技有限公司 High-strength die steel
CN105734445A (en) * 2014-12-10 2016-07-06 新疆八一钢铁股份有限公司 Cold work die steel
CN104532135B (en) * 2014-12-24 2017-03-22 河冶科技股份有限公司 Cold work die steel and preparation method thereof
CN104878300B (en) * 2015-05-15 2017-08-04 河冶科技股份有限公司 Injection shaping high tenacity tool steel
CN105925918B (en) * 2016-06-27 2017-08-04 山东建筑大学 A kind of preparation method of alumina carbon SiClx whisker reinforcement cold working die steel material
CN107460405A (en) * 2017-08-22 2017-12-12 中北大学 Ultrahigh hardness superhigh intensity speciality steel and its production method
CN107460411A (en) * 2017-09-08 2017-12-12 江苏精工特种材料有限公司 High silicomanganese high speed steel material and preparation method thereof
CN107937668A (en) * 2017-11-28 2018-04-20 湖北工程职业学院 A kind of heat treatment quenching process of cold work tool steel precision component
CN110318003A (en) * 2018-03-29 2019-10-11 湖北长怡特钢贸易有限公司 A kind of high-wearing feature 7Cr7Mo2V2Si cold work die steel

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