CN103233187A - 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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- CN103233187A CN103233187A CN2013102034347A CN201310203434A CN103233187A CN 103233187 A CN103233187 A CN 103233187A CN 2013102034347 A CN2013102034347 A CN 2013102034347A CN 201310203434 A CN201310203434 A CN 201310203434A CN 103233187 A CN103233187 A CN 103233187A
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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 when work. because the resistance to deformation of machined material is bigger, the working portion of mould bears very big pressure, bending force, surging force and frictional force.Therefore, the normal abandonment reason of cold-work die generally is wearing and tearing. also have because of fracture, collapse power and be out of shape and overproofly lost efficacy in advance.
Cold-work die steel requires mould that high hardness and wear resistance, high bending strength and enough toughness are arranged, guaranteeing carrying out smoothly of punching course, and because mold shape and add the technology complexity, and friction area is big, the wearing and tearing possibility is big, the difficulty so reconditioning is got up.It is big to bear stamping press when therefore requiring to have higher wear-resistingization mold work. be easy to produce stress concentration owing to complex-shaped again, so require to have high toughness; So die size is big, complex-shaped. the hardening capacity of having relatively high expectations, less distortion and tearing tendency.Because the complex structure of mould requires steel to have and processes cutting ability preferably, be the parameter of relative contradiction and process cutting ability preferably with wear and shock-resistant performance preferably simultaneously, so the proportioning of cold-work die steel, production technique complexity comparatively.
Summary of the invention:
The objective of the invention is provides a kind of cold-work die steel and production method thereof at the problem of above-mentioned existence, this steel has high hardness, intensity, wear resistance, enough toughness, and high hardening capacity, hardenability and and have good anti-cutting ability, be adapted to the needs of cold-work die.
Above-mentioned purpose realizes by following technical scheme:
Cold-work die steel, by the quality percentage composition 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 0.02% P, Mo, 0.05%～0.2% the Al of 0.22%～0.30% Pb, 0.05%～0.08% Bi, 0.17～0.45% W, 0.19%--3.00%, the Ti of 0.16%--0.80%, 8.2-12.0% Cr, surplus is Fe and unavoidable impurities.
Cold-work die steel, by the quality percentage composition 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, Mo, 0.15%～0.2% Al, 8.8-11.6% the Cr of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
Cold-work die steel, comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.15% Al by the quality percentage composition, 10.5% Cr, surplus is Fe and unavoidable impurities.
A kind of production method of cold-work die steel; this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; requirement according to mould is cut; grinding; polishing; heat-treating then, the thermal treatment initial temperature is 950 ℃～980 ℃, time 1-2 hour; the thermal treatment end temp is 1100 ℃～1150 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
Beneficial effect:
1. show through inventor's experimental study repeatedly: adopt the C of 1.8%-2.2% among the present invention, make cold-work die steel of the present invention have hardening capacity and good wear resistance preferably;
The present invention contains 0.9-1.35% Mn, makes that cutting is cataclasm easily, and is conducive to improve the quality of finished surface; 0.10%-0.30% S improves the machinability of steel, artificially sulphur content is improved, and to form sulfide, works the successional effect of matrix of interrupting;
Si, reinforced ferrite, intensity and the hardness of raising steel, the critical cooling velocity of reduction steel, the hardening capacity of raising steel, the solidity to corrosion in the oxidisability corrosive medium of raising steel, the thermotolerance of raising steel;
The present invention adopts 0.22%～0.30% Pb, plumbous is tiny metallic particles form in steel, evenly distribute or be attached to sulfide around.Because plumbous fusing point is lower, lubricate is oozed out in melting during cutting, reduces friction, improves machinability, but does not influence ambient temperature mechanical properties;
Because mould when thermal treatment, especially in quenching process, produce volume change, shape warpage, distortion etc., for guaranteeing die quality, require the heat treatment deformation of die steel little, particularly for complex-shaped precision die, be difficult to finishing after the quenching, requirement for the heat treatment deformation degree is more harsh, the present invention adopts 0.17～0.45% W, improves the intensity of steel, improves the hot strength of steel, improve the anti-hydrogen performance of steel, make steel have thermohardening;
The present invention adopts the Mo of 0.19%--3.00%, and molybdenum has the solution strengthening effect to ferrite, improves the steel heat resistance, the effect of anti-hydrogen attack, the hardening capacity of raising steel.
The present invention adopts 8.2-12.0% Cr, and chromium can significantly improve intensity, hardness and wear resistance, but reduces plasticity and toughness simultaneously.Chromium can improve oxidation-resistance and the erosion resistance of steel again, thereby is stainless steel, the important alloying element of high temperature steel.
The present invention adopts 0.15%～0.2% Al, and the nitrogen agent is decided in the deoxidation during as steel-making, crystal grain thinning, and the timeliness of inhibition soft steel is improved the toughness of steel when low temperature, has particularly reduced the brittle transition temperature of steel; Improve the antioxidant property of steel.
2. steps such as the advanced cutting of the present invention, grinding, polishing allow is heat-treating behind the mould molding, and the effect of the system of heat treatment process of taking is as follows:
The thermal treatment of the following temperature of recrystallize: stop the density that thermal treatment below the temperature can increase ferrite nucleation site in the austenite by recrystallize, control ferrite and pearlitic grain size, this toughness for the effect of bringing into play refined crystalline strengthening and raising material is very crucial.
Thermal treatment end temp: take equally effectively thinning microstructure of lower thermal treatment temp, improve the toughness of product.The present invention adopts average tempering, and carbide is suitably assembled, and obtain the thicker tempered sorbite tissue of carbide particle (organizing similar to Spheroidizing Annealing), thereby the steel of this condition of delivery has good machinability.
Quenching temperature: suitable quenching temperature is the important assurance that obtains suitable perlite and ferrite grain size composition,
3. because the present invention adopts reasonable proportioning, good complete processing makes yield strength of the present invention surpass 750MPa, and tensile strength surpasses 820MPa, has wear resistance and thermal fatigue resistance preferably simultaneously.
Embodiment:
Embodiment 1:
Cold-work die steel, by the quality percentage composition 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 0.02% P, Mo, 0.05%～0.2% the Al of 0.22%～0.30% Pb, 0.05%～0.08% Bi, 0.17～0.45% W, 0.19%--3.00%, the Ti of 0.16%--0.80%, 8.2-12.0% Cr, surplus is Fe and unavoidable impurities.
Embodiment 2:
Cold-work die steel, by the quality percentage composition 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, Mo, 0.15%～0.2% Al, 8.8-11.6% the Cr of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
Embodiment 3:
Cold-work die steel, comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.15% Al by the quality percentage composition, 10.5% Cr, surplus is Fe and unavoidable impurities.
Embodiment 4:
Cold-work die steel, comprise 2.2% C, 1.35% Mn, 0.30% S, be not more than 0.04% Si, be not more than 0.02% P, 0.30% Pb, 0.08% Bi, 0.45% W, 3.00% Mo, 0.05% Al by the quality percentage composition, 0.16% Ti, 8.2% Cr, surplus is Fe and unavoidable impurities.
Embodiment 5:
Cold-work die steel, comprise 1.8% C, 0.9% Mn, 0.12% S, be not more than 0.04% Si, be not more than 0.02% P, 0.22% Pb, 0.05% Bi, 0.17% W, 0.19% Mo, 0.05% Al by the quality percentage composition, 0.80% Ti, 12.0% Cr, surplus is Fe and unavoidable impurities.
The production method of above-mentioned cold-work die steel; this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; steel ingot is through the postheat treatment of process furnace reheat, and the thermal treatment initial temperature is 950 ℃～980 ℃, time 1-2 hour; the thermal treatment end temp is 1100 ℃～1150 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
The disclosed technique means of the present invention program is not limited only to the disclosed technique means of above-mentioned technique means, also comprises by above technical characterictic being equal to the technical scheme that replacement is formed.Unaccomplished matter of the present invention belongs to those skilled in the art's common practise.
Claims (4)
1. cold-work die steel, it is characterized in that: by the quality percentage composition 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 0.02% P, Mo, 0.05%～0.2% the Al of 0.22%～0.30% Pb, 0.05%～0.08% Bi, 0.17～0.45% W, 0.19%--3.00%, the Ti of 0.16%--0.80%, 8.2-12.0% Cr, surplus is Fe and unavoidable impurities.
2. cold-work die steel, it is characterized in that: by the quality percentage composition 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, Mo, 0.15%～0.2% Al, 8.8-11.6% the Cr of 0.20%～0.30% Pb, 0.06%～0.08% Bi, 0.20～0.40% W, 1.00%--2.55%, surplus is Fe and unavoidable impurities.
3. cold-work die steel, it is characterized in that: comprise 2.2% C, 0.85% Mn, 0.25% S, be not more than 0.04% Si, be not more than 0.02% P, 0.25% Pb, 0.07% Bi, 0.15% W, 1.25% Mo, 0.15% Al by the quality percentage composition, 10.5% Cr, surplus is Fe and unavoidable impurities.
4. the production method of an above-mentioned cold-work die steel; it is characterized in that: this method comprises: according to said ratio raw material is carried out molten iron pre-desulfurization successively; the converter top bottom blowing; bottom blowing Ar stirs; described bottom blowing Ar churning time is no less than 12 minutes; carrying out trimming through the RH stove then obtains carrying out the vacuum circulation degassing processing after the said ratio; guarantee that the pure degassing time of RH is no less than 6 minutes; adopt whole process to blow Ar protection casting again; be cast into steel ingot; requirement according to mould is cut; grinding; polishing; heat-treating then, the thermal treatment initial temperature is 950 ℃～980 ℃, time 1-2 hour; the thermal treatment end temp is 1100 ℃～1150 ℃; tempering temperature is 860 ℃～880 ℃, tempering time 2 hours, 550 ℃～650 ℃ of quenching temperatures.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113215482A (en) * | 2021-03-22 | 2021-08-06 | 武汉钜能科技有限责任公司 | Wear-resistant cold-work tool steel |
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|---|---|---|---|---|
| JP2006193790A (en) * | 2005-01-14 | 2006-07-27 | Daido Steel Co Ltd | Cold working tool steel |
| CN1824818A (en) * | 2006-01-25 | 2006-08-30 | 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 |
| CN101542004A (en) * | 2007-04-18 | 2009-09-23 | 新日本制铁株式会社 | Hot-worked steel material having excellent machinability and impact value |
| CN102268606A (en) * | 2011-07-22 | 2011-12-07 | 北京科技大学 | High-wear-resistance die steel for pressed bricks |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006193790A (en) * | 2005-01-14 | 2006-07-27 | Daido Steel Co Ltd | Cold working tool steel |
| CN1824818A (en) * | 2006-01-25 | 2006-08-30 | 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 |
| CN101542004A (en) * | 2007-04-18 | 2009-09-23 | 新日本制铁株式会社 | Hot-worked steel material having excellent machinability and impact value |
| CN102268606A (en) * | 2011-07-22 | 2011-12-07 | 北京科技大学 | High-wear-resistance die steel for pressed bricks |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN113215482A (en) * | 2021-03-22 | 2021-08-06 | 武汉钜能科技有限责任公司 | Wear-resistant cold-work tool steel |
| 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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| CN103233187B (en) | 2015-02-18 |
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