CN103233187B - Steel for cold working die and production method thereof - Google Patents
Steel for cold working die and production method thereof Download PDFInfo
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- CN103233187B CN103233187B CN201310203434.7A CN201310203434A CN103233187B CN 103233187 B CN103233187 B CN 103233187B CN 201310203434 A CN201310203434 A CN 201310203434A CN 103233187 B CN103233187 B CN 103233187B
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Abstract
The invention provides steel for cold working die and a production method thereof. The die is hard to cut and grind, since steel for a cold working die is required to have high hardness, high abrasive resistance, high bending strength and enough toughness so to ensure a smooth stamping process and to the die is complicated in shape and manufacturing process, has large frictional area and high abrasive probability. The steel for the cold working die, disclosed by the invention, is characterized by comprising the following components in percentage by weight: 1.8-2.2% of C, 0.9-1.35% of Mn, 0.12-0.30% of S, not greater than 0.04% of Si, not greater than 0.02% of P, 0.22-0.30% of Pb, 0.05-0.08% of Bi, 0.17-0.45% of W, 0.19-3.00% of Mo, 0.05-0.2% of Al. 0.16-0.80% of Ti, 8.2-12.0% of Cr and the balance of Fe and inevitable impurities. The steel provided by the invention is used to produce cold working dies.
Description
technical field:
The present invention relates to a kind of die steel, a kind of cold-work die steel of specific design and production method thereof.
background technology:
Cold-work die steel is operationally. and because the resistance to deformation of machined material is larger, the working portion of mould bears very large pressure, bending force, surging force and frictional force.Therefore, the normal abandonment reason of cold-work die is generally wearing and tearing. also have because of fracture, collapse power and be out of shape overproof and premature failure.
Cold-work die steel requires that mould has high hardness and wear resistance, high bending strength and enough toughness, to ensure carrying out smoothly of punching course, and due to mold shape and add complex process, and friction area is large, wearing and tearing possibility is large, the difficulty so reconditioning is got up.Therefore require to bear stamping press when there is higher wear-resistingization mold work large. again because complex-shaped being easy to produces stress concentration, so require that there is higher toughness; Die size is large, complex-shaped. so require higher hardening capacity, less distortion and tearing tendency.Simultaneously due to the complex structure of mould, require that steel has and process cutting ability preferably, and process the parameter that cutting ability and good wear and shock-resistant performance are relative contradiction preferably, therefore the proportioning of cold-work die steel, production technique are comparatively complicated.
summary of the invention:
The object of the invention is to provide a kind of cold-work die steel and production method thereof for above-mentioned Problems existing, this steel has high hardness, intensity, wear resistance, enough toughness, and high hardening capacity, hardenability and and there is good resistance to cutting ability, be adapted to the needs of cold-work die.
Above-mentioned object is realized by following technical scheme:
Cold-work die steel, by mass percentage comprise 1.8%-2.2% C, 0.9-1.35% Mn, 0.12%-0.30% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.05% ~ 0.08%, the Mo of W, 0.19%--3.00% of 0.17 ~ 0.45%, the Al of 0.05% ~ 0.2% of 0.22% ~ 0.30%, the Ti of 0.16%--0.80%, the Cr of 8.2-12.0%, surplus is Fe and inevitable impurity.
Cold-work die steel, by mass percentage comprise 2.0%-2.2% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.20% ~ 0.30% Pb, the Bi of 0.06% ~ 0.08%, the Mo of W, 1.00%--2.55% of 0.20 ~ 0.40%, the Al of 0.15% ~ 0.2%, the Cr of 8.8-11.6%, surplus is Fe and inevitable impurity.
Cold-work die steel, by mass percentage comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.07%, W, the Mo of 1.25%, the Al of 0.15% of 0.15% of 0.25%, the Cr of 10.5%, surplus is Fe and inevitable impurity.
A kind of production method of cold-work die steel, the method comprises: according to said ratio, raw material is carried out molten iron pre-desulfurization successively, converter top bottom blowing, end Stirring by Ar Blowing, described bottom blowing Ar churning time is no less than 12 minutes, then carry out carrying out vacuum circulation degassing process after trimming obtains said ratio through RH stove, ensure that the pure degassing time of RH is no less than 6 minutes, whole process is adopted to blow Ar protective casting again, be cast into steel ingot, cut according to the requirement of mould, grinding, polishing, then heat-treating, thermal treatment initial temperature is 950 DEG C ~ 980 DEG C, time 1-2 hour, thermal treatment end temp is 1100 DEG C ~ 1150 DEG C, tempering temperature is 860 DEG C ~ 880 DEG C, tempering time 2 hours, quenching temperature 550 DEG C ~ 650 DEG C.
Beneficial effect:
1. show through the present inventor's experimental study repeatedly: the C adopting 1.8%-2.2% in the present invention, make cold-work die steel of the present invention have good hardening capacity and good wear resistance;
The present invention contains the Mn of 0.9-1.35%, makes cutting easily cataclasm, and is conducive to the quality improving finished surface; The S of 0.10%-0.30% improves the machinability of steel, artificially sulphur content is improved, and to form sulfide, plays and interrupts the successional effect of matrix;
Si, reinforced ferrite, improve intensity and the hardness of steel, reduce the critical cooling velocity of steel, improve the hardening capacity of steel, improve the solidity to corrosion in the oxidizing corrosion medium of steel, improve the thermotolerance of steel;
The present invention adopts the Pb of 0.22% ~ 0.30%, and plumbous be fine metal particles form in steel, is uniformly distributed or is attached to around sulfide.Because the fusing point of lead is lower, during cutting, lubricate is oozed out in melting, reduces friction, improves machinability, but does not affect ambient temperature mechanical properties;
Because mould is when thermal treatment, especially in quenching process, volume change, shape distortion, distortion etc. be produced, for ensureing die quality, require that the heat treatment deformation of die steel is little, particularly for complex-shaped precision die, after quenching, be difficult to finishing, requirement for heat treatment deformation degree is more harsh, the present invention adopts the W of 0.17 ~ 0.45%, improves the intensity of steel, improves the hot strength of steel, improve the resistant to hydrogen performance of steel, make steel have thermohardening;
The present invention adopts the Mo of 0.19%--3.00%, and molybdenum has solution strengthening effect to ferrite, improves steel heat resistance, the effect that resistant to hydrogen corrodes, and improves the hardening capacity of steel.
The present invention adopts the Cr of 8.2-12.0%, and chromium can significantly improve intensity, hardness and wear resistance, but reduces plasticity and toughness simultaneously.Chromium can improve again oxidation-resistance and the erosion resistance of steel, because of but stainless steel, the important alloying element of high temperature steel.
The present invention adopts the Al of 0.15% ~ 0.2%, and deoxidation when being used as steel-making determines nitrogen agent, crystal grain thinning, suppresses the timeliness of soft steel, improves the toughness of steel when low temperature, particularly reduce the brittle transition temperature of steel; Improve the antioxidant property of steel.
2. the step such as the present invention's advanced cutting, grinding, polishing allows after mould molding and is heat-treating, and the effect of the system of heat treatment process taked is as follows:
The thermal treatment of the following temperature of recrystallize: stop the thermal treatment of below temperature can increase the density of ferrite nucleation point in austenite by recrystallize, control ferrite and pearlite grain-size, this toughness for the effect and raising material that play refined crystalline strengthening is very crucial.
Thermal treatment end temp: take lower thermal treatment temp equally can effective thinning microstructure, improves the toughness of product.The present invention adopts average tempering, and carbide in steel is suitably assembled, and obtains the thicker tempered sorbite tissue of carbide particle (organizing similar to Spheroidizing Annealing), and thus, the steel of this condition of delivery have good machinability.
Quenching temperature: suitable quenching temperature is the important guarantee obtaining perlite and the ferrite grain size composition be applicable to,
3., because the present invention adopts rational proportioning, excellent complete processing, makes yield strength of the present invention more than 750MPa, and tensile strength, more than 820MPa, has good wear resistance and thermal fatigue resistance simultaneously.
embodiment:
Embodiment 1:
Cold-work die steel, by mass percentage comprise 1.8%-2.2% C, 0.9-1.35% Mn, 0.12%-0.30% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.05% ~ 0.08%, the Mo of W, 0.19%--3.00% of 0.17 ~ 0.45%, the Al of 0.05% ~ 0.2% of 0.22% ~ 0.30%, the Ti of 0.16%--0.80%, the Cr of 8.2-12.0%, surplus is Fe and inevitable impurity.
Embodiment 2:
Cold-work die steel, by mass percentage comprise 2.0%-2.2% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.20% ~ 0.30% Pb, the Bi of 0.06% ~ 0.08%, the Mo of W, 1.00%--2.55% of 0.20 ~ 0.40%, the Al of 0.15% ~ 0.2%, the Cr of 8.8-11.6%, surplus is Fe and inevitable impurity.
Embodiment 3:
Cold-work die steel, by mass percentage comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.07%, W, the Mo of 1.25%, the Al of 0.15% of 0.15% of 0.25%, the Cr of 10.5%, surplus is Fe and inevitable impurity.
Embodiment 4:
Cold-work die steel, by mass percentage comprise 2.2% C, 1.35% Mn, 0.30% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.08%, W, the Mo of 3.00%, the Al of 0.05% of 0.45% of 0.30%, the Ti of 0.16%, the Cr of 8.2%, surplus is Fe and inevitable impurity.
Embodiment 5:
Cold-work die steel, by mass percentage comprise 1.8% C, 0.9% Mn, 0.12% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.05%, W, the Mo of 0.19%, the Al of 0.05% of 0.17% of 0.22%, the Ti of 0.80%, the Cr of 12.0%, surplus is Fe and inevitable impurity.
The production method of above-mentioned cold-work die steel, the method comprises: according to said ratio, raw material is carried out molten iron pre-desulfurization successively, converter top bottom blowing, end Stirring by Ar Blowing, described bottom blowing Ar churning time is no less than 12 minutes, then carry out carrying out vacuum circulation degassing process after trimming obtains said ratio through RH stove, ensure that the pure degassing time of RH is no less than 6 minutes, whole process is adopted to blow Ar protective casting again, be cast into steel ingot, steel ingot reheats postheat treatment through process furnace, thermal treatment initial temperature is 950 DEG C ~ 980 DEG C, time 1-2 hour, thermal treatment end temp is 1100 DEG C ~ 1150 DEG C, tempering temperature is 860 DEG C ~ 880 DEG C, tempering time 2 hours, quenching temperature 550 DEG C ~ 650 DEG C.
Technique means disclosed in the present invention program is not limited only to the technique means disclosed in above-mentioned technique means, also comprises and is equal to by above technical characteristic the technical scheme that replacement forms.Unaccomplished matter of the present invention, belongs to the common practise of those skilled in the art.
Claims (1)
1. a cold-work die steel, it is characterized in that: by mass percentage comprise 1.8%-2.2% C, 0.9-1.35% Mn, 0.12%-0.30% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.05% ~ 0.08%, the Mo of W, 0.19%--3.00% of 0.17 ~ 0.45%, the Al of 0.05% ~ 0.2% of 0.22% ~ 0.30%, the Ti of 0.16%--0.80%, the Cr of 8.2-12.0%, surplus is Fe and inevitable impurity.
2. a cold-work die steel, it is characterized in that: by mass percentage comprise 2.0%-2.2% C, 0.9-1.25% Mn, 0.15%-0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.20% ~ 0.30% Pb, the Bi of 0.06% ~ 0.08%, the Mo of W, 1.00%--2.55% of 0.20 ~ 0.40%, the Al of 0.15% ~ 0.2%, the Cr of 8.8-11.6%, surplus is Fe and inevitable impurity.
3. a cold-work die steel, it is characterized in that: by mass percentage comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than the P of 0.02%, Pb, the Bi of 0.07%, W, the Mo of 1.25%, the Al of 0.15% of 0.15% of 0.25%, the Cr of 10.5%, surplus is Fe and inevitable impurity.
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| CN201310203434.7A CN103233187B (en) | 2013-05-28 | 2013-05-28 | Steel for cold working die and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105401101A (en) * | 2015-10-28 | 2016-03-16 | 安徽省三方新材料科技有限公司 | High-chromium alloy wear-resisting microsphere and preparation process thereof |
| CN106119738A (en) * | 2016-06-28 | 2016-11-16 | 浙江工贸职业技术学院 | A kind of alloy material for marine drilling platform gauge valve spool and manufacture method |
| CN107523754A (en) * | 2017-06-30 | 2017-12-29 | 太仓旺美模具有限公司 | A kind of mold materials of wear-resisting heat conduction |
| CN113215482B (en) * | 2021-03-22 | 2022-05-20 | 武汉钜能科技有限责任公司 | Wear-resistant cold-work tool steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006193790A (en) * | 2005-01-14 | 2006-07-27 | Daido Steel Co Ltd | Cold working tool steel |
| CN100491576C (en) * | 2006-01-25 | 2009-05-27 | 周向儒 | Cold extruding die steel and heat treatment technique thereof |
| JP2007197784A (en) * | 2006-01-27 | 2007-08-09 | Daido Steel Co Ltd | Alloy steel |
| JP2007231337A (en) * | 2006-02-28 | 2007-09-13 | Jfe Steel Kk | Hot rolled steel sheet and steel component |
| KR20120126131A (en) * | 2007-04-18 | 2012-11-20 | 신닛테츠스미킨 카부시키카이샤 | Hot-worked steel material having excellent machinability and impact value |
| CN102268606B (en) * | 2011-07-22 | 2012-10-31 | 霸州市三迪超硬工模具有限公司 | High-wear-resistance die steel for pressed bricks |
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