CN105177430A - Alloy tool steel and production method thereof - Google Patents
Alloy tool steel and production method thereof Download PDFInfo
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- CN105177430A CN105177430A CN201510687941.1A CN201510687941A CN105177430A CN 105177430 A CN105177430 A CN 105177430A CN 201510687941 A CN201510687941 A CN 201510687941A CN 105177430 A CN105177430 A CN 105177430A
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Abstract
The invention discloses an alloy tool steel and a production method thereof. The steel comprises the following chemical components in percentage by mass: 0.5% of C, 0.2% of Si, 0.5% of Mn, 5.0% of Cr, 2.3% of Mo, 0.5% of V, at most 0.003% of S, at most 0.02% of P and the balance of Fe. The hardness of the alloy tool steel is HRC56-58. Compared with the existing alloy tool steel, the alloy tool steel disclosed by the invention has the advantages of higher hardness, excellent toughness, excellent ductility, excellent wear resistance, excellent hardenability and excellent heat treatment dimensional stability, can be used for producing hot-working molds, can also be used for producing cold working molds and engineering steel, and thus, has wider application range.
Description
Technical field
The present invention relates to a kind of tool steel, particularly a kind of alloy tool steel and production method thereof.
Background technology
Alloy tool steel on carbon tool steel basis, adds the alloying elements such as chromium, molybdenum, tungsten, vanadium to improve a class steel grade of hardening capacity, toughness, wear resistance and thermotolerance.It is mainly for the manufacture of the instrument of measurer, cutlery, impact resistant tools and hot and cold mould and some special purposes.When the carbon content in alloy tool steel is medium, namely when the massfraction of carbon is 0.35%-0.70%, the toughness of this alloy tool steel is good, but hardness is slightly low, be HRC50-55, be used for manufacturing hot-work die, range of application is narrower, if improve the hardness of alloy tool steel, then its toughness reduces, and over-all properties is not good.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the first object of the present invention is to provide a kind of alloy tool steel, have excellent toughness and ductility, and the scope of application is wider while having good hardness.
To achieve these goals, a kind of alloy tool steel designed by the present invention, this steel has following chemical composition and mass percent:
C0.5%, Si0.2%, Mn0.5%, Cr5.0%, Mo2.3%, V0.5%, S≤0.003%, P≤0.02%, Fe surplus.
Wherein, C is the hardness and the most effective element of intensity that improve steel, and solution strengthening effect is remarkable, is to ensure the requisite element of tool steel hardness.C is the indispensable fundamental element forming the various carbide such as chromium carbide, and the too high meeting of C content causes increasing and segregation of carbide quantity in steel, reduces toughness and corrosion resistance nature, the too low high rigidity requirement that can not meet tool steel of C content.The present invention controls C content 0.5%.
Have good desoxydatoin containing a small amount of Si in steel, but Si too high levels then reduces welding and the machinability of steel.The present invention's control Si content is 0.2%.
Mn too high levels in steel, has the phenomenon causing grain coarsening, increases steel belt roof bolt fragility simultaneously.The present invention's control Mn content is 0.5%.
Cr is the element with passivation tendency, and Cr can improve hardening capacity, improves temper resistance simultaneously, and its carbide has extreme hardness, and the hardness of steel, wear resistance can be made to improve.The present invention's control Cr content is 5%.
Mo can strengthen hardening capacity and the temper resistance of steel, all right crystal grain thinning, reduces temper brittleness and also improves thermohardening.The present invention's control Mo content is 2.3%.
V can strengthen antiwear property and the ductility of steel.The present invention's control V content is 0.5%.
P element easily in grain boundaries segregation, cause the fragility of steel to increase, therefore the P content in steel should be low as far as possible, the present invention's control P≤0.02% in steel.
S element exists with the form of sulfide in steel, reduce lateral extension and the toughness properties of steel, therefore the S content in steel should be low as far as possible, the present invention's control S≤0.003%.
Another object of the present invention is to provide a kind of production method of above-mentioned alloy tool steel, comprises the following steps: (1), prepare burden according to the chemical composition of above-mentioned tool steel and mass percent, then pours into electrode bar at vacuum induction melting;
(2), using made for above-mentioned smelting and pouring electrode bar as the consumable electrode in esr process, control solidi fication finally forms the even steel ingot of high-quality;
(3) steel ingot, after remelting is rolled or forge into block material or bar;
(4), block material or bar are heat-treated obtain tool steel;
Wherein heat treatment process comprise carry out successively softening annealing, stress relief annealing, quenching and at least double tempering.
The technical process of described softening annealing is: under guard mode, and after being heated to 850 DEG C of sammings, in stove, the speed of 10 DEG C per hour is cooled to 600 DEG C, then is placed in air and cools.
The technical process of described stress relief annealing is: in stove, be heated to 650 DEG C, is incubated after 2 hours, is cooled to 500 DEG C, and then is placed in air and cools.
Preheating temperature in described quenching technology is 600-650 DEG C and 850-900 DEG C, and austenitizing temperature is 1000-1025 DEG C, and adopt oil cooling or air cooling or salt bath to cool, soaking time is 30 minutes.
Tempering temperature in described drawing process is 525-600 DEG C, and the time of each tempering is at least 2 hours.
A kind of alloy tool steel that the present invention obtains and production method thereof, its technique effect is: the hardness of this alloy tool steel is HRC56-58, compared with existing alloy tool steel, there is higher hardness, excellent toughness, ductility, wear resistance, hardening capacity and thermal treatment dimensional stability, not only may be used for producing hot-work die, also may be used for producing cold-work die and engineering steel, range of application is wider.
Embodiment
Below in conjunction with embodiment, the present invention is further described.
A kind of alloy tool steel provided by the invention, this steel has following chemical composition and mass percent:
C0.5%, Si0.2%, Mn0.5%, Cr5.0%, Mo2.3%, V0.5%, S≤0.003%, P≤0.02%, Fe surplus.
The production method of this alloy tool steel is as follows:
(1), according to the chemical composition of above-mentioned tool steel and mass percent prepare burden, then pour into electrode bar at vacuum induction melting;
(2), using made for above-mentioned smelting and pouring electrode bar as the consumable electrode in esr process, control solidi fication finally forms the even steel ingot of high-quality;
(3) steel ingot, after remelting is rolled or forge into block material or bar;
(4), block material or bar are heat-treated obtain tool steel;
Wherein heat treatment process comprise carry out successively softening annealing, stress relief annealing, quenching and at least double tempering.
The technical process of described softening annealing is: under guard mode, and after being heated to 850 DEG C of sammings, in stove, the speed of 10 DEG C per hour is cooled to 600 DEG C, then is placed in air and cools.
The technical process of described stress relief annealing is: in stove, be heated to 650 DEG C, is incubated and slowly cools to 500 DEG C after 2 hours, and then is placed in air and cools.
Preheating temperature in described quenching technology is 600-650 DEG C and 850-900 DEG C, and austenitizing temperature is 1000-1025 DEG C, and in the present embodiment, austenitizing temperature is 1025 DEG C, and adopt oil cooling or air cooling or salt bath to cool, soaking time is 30 minutes.
When bar or block material are cooled to 50-70 DEG C of tempering immediately after quenching.
Tempering temperature in described drawing process is 525-600 DEG C, and the tempering temperature in the present embodiment is 525 DEG C, and the time of each tempering is at least 2 hours.
The hardness of the alloy tool steel after heat treatment obtained is 56-58HRC, get the φ 125mm of 56HRC, the φ 125mm of φ 220mm bar and 396*136mm block material and 58HRC, φ 220mm bar and 396*136mm block material respectively and at room temperature carry out tension test, draw following detected value:
When hardness is 56HRC, yield strength is 1780MPa, and tensile strength is 2150MPa, and rate elongation is 8%, and area contraction ratio is 32%;
When hardness is 58HRC, yield strength is 1780MPa, and tensile strength is 2510MPa, and rate elongation is 8%, and area contraction ratio is 28%;
It can thus be appreciated that while this alloy tool steel has better hardness than existing alloy tool steel, have excellent toughness and ductility, over-all properties is better, and range of application is wider, may be used for hot-work die, cold-work die and engineering steel.
Claims (6)
1. an alloy tool steel, is characterized in that this steel has following chemical composition and mass percent:
C0.5%, Si0.2%, Mn0.5%, Cr5.0%, Mo2.3%, V0.5%, S≤0.003%, P≤0.02%, Fe surplus.
2. the production method of alloy tool steel according to claim 1, is characterized in that comprising the following steps:
(1), according to the chemical composition of above-mentioned tool steel and mass percent prepare burden, then pour into electrode bar at vacuum induction melting;
(2), using made for above-mentioned smelting and pouring electrode bar as the consumable electrode in esr process, control solidi fication finally forms the even steel ingot of high-quality;
(3) steel ingot, after remelting is rolled or forge into block material or bar;
(4), block material or bar are heat-treated obtain tool steel;
Wherein heat treatment process comprise carry out successively softening annealing, stress relief annealing, quenching and at least double tempering.
3. the production method of alloy tool steel according to claim 2; it is characterized in that: the technical process of described softening annealing is: under guard mode; after being heated to 850 DEG C of sammings, in stove, the speed of 10 DEG C per hour is cooled to 600 DEG C, then is placed in air and cools.
4. the production method of alloy tool steel according to claim 2, is characterized in that: the technical process of described stress relief annealing is: in stove, be heated to 650 DEG C, is incubated after 2 hours, is cooled to 500 DEG C, and then is placed in air and cools.
5. the production method of alloy tool steel according to claim 2, it is characterized in that: the preheating temperature in described quenching technology is 600-650 DEG C and 850-900 DEG C, austenitizing temperature is 1000-1025 DEG C, adopt oil cooling or air cooling or salt bath to cool, soaking time is 30 minutes.
6. the production method of alloy tool steel according to claim 2, is characterized in that: the tempering temperature in described drawing process is 525-600 DEG C, and the time of each tempering is at least 2 hours.
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| CN201510687941.1A CN105177430A (en) | 2015-10-20 | 2015-10-20 | Alloy tool steel and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107155509A (en) * | 2017-07-10 | 2017-09-15 | 合肥雄川机械销售有限公司 | A kind of harvester blade and preparation method thereof |
| CN107541591A (en) * | 2017-08-29 | 2018-01-05 | 西安汇丰精密合金制造有限公司 | A kind of manufacture method of super electromagnetic pure iron DT4C bars |
| CN108660390A (en) * | 2017-03-27 | 2018-10-16 | 宝钢特钢有限公司 | A kind of high impact toughness cold work die steel and preparation method thereof |
| CN109355574A (en) * | 2018-12-13 | 2019-02-19 | 天津钢研海德科技有限公司 | A kind of cutter ring alloy of high abrasion high tenacity and preparation method thereof |
| CN109487161A (en) * | 2018-12-13 | 2019-03-19 | 天津钢研海德科技有限公司 | A kind of high strength and high hardness has both toughness cutter ring of disc cutter and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101302599A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | Niobium microalloyed high strength hot work die steel and preparation thereof |
| CN101921959A (en) * | 2009-06-16 | 2010-12-22 | 大同特殊钢株式会社 | Hot working tool steel and the steel work that uses it to make |
| CN103276298A (en) * | 2013-06-09 | 2013-09-04 | 河冶科技股份有限公司 | High-hardness high-tenacity cold and hot work die steel and production method thereof |
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2015
- 2015-10-20 CN CN201510687941.1A patent/CN105177430A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101302599A (en) * | 2008-07-01 | 2008-11-12 | 上海大学 | Niobium microalloyed high strength hot work die steel and preparation thereof |
| CN101921959A (en) * | 2009-06-16 | 2010-12-22 | 大同特殊钢株式会社 | Hot working tool steel and the steel work that uses it to make |
| CN103276298A (en) * | 2013-06-09 | 2013-09-04 | 河冶科技股份有限公司 | High-hardness high-tenacity cold and hot work die steel and production method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108660390A (en) * | 2017-03-27 | 2018-10-16 | 宝钢特钢有限公司 | A kind of high impact toughness cold work die steel and preparation method thereof |
| CN107155509A (en) * | 2017-07-10 | 2017-09-15 | 合肥雄川机械销售有限公司 | A kind of harvester blade and preparation method thereof |
| CN107541591A (en) * | 2017-08-29 | 2018-01-05 | 西安汇丰精密合金制造有限公司 | A kind of manufacture method of super electromagnetic pure iron DT4C bars |
| CN107541591B (en) * | 2017-08-29 | 2019-11-15 | 西安汇丰精密合金制造有限公司 | A kind of manufacturing method of super electromagnetic pure iron DT4C bar |
| CN109355574A (en) * | 2018-12-13 | 2019-02-19 | 天津钢研海德科技有限公司 | A kind of cutter ring alloy of high abrasion high tenacity and preparation method thereof |
| CN109487161A (en) * | 2018-12-13 | 2019-03-19 | 天津钢研海德科技有限公司 | A kind of high strength and high hardness has both toughness cutter ring of disc cutter and preparation method thereof |
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Application publication date: 20151223 |