CN102943216B - Mold steel used for hot-forging mold-pressing casting mold - Google Patents
Mold steel used for hot-forging mold-pressing casting mold Download PDFInfo
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- CN102943216B CN102943216B CN201210406238.5A CN201210406238A CN102943216B CN 102943216 B CN102943216 B CN 102943216B CN 201210406238 A CN201210406238 A CN 201210406238A CN 102943216 B CN102943216 B CN 102943216B
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Abstract
The invention discloses a mold steel used for a hot-forging mold-pressing casting mold. The matrix of the mold steel is composed of the following components of, by mass, 0.23-0.35% of C, 1.4-2.0% of Mn, 0.8-1.5% of Si, 0.11-0.15% of V, 0.10-0.19% of Ti, 0.8-2.0% of Cr, 0.4-1.5% of Ni, 0.21-0.8% of W, 0.02-0.06% of Nb, 0.30%-1.20% of Cu, equal to or less than 0.034% of P, equal to or less than 0.050% of S, and the balance being Fe and inevitable inclusion impurities. A casting process comprises the steps of heating the mold steel containing the above components at a temperature of 650-760 DEG C, keeping the temperature for 5-6 hours, furnace cooling to a temperature of 280-320 DEG C, keeping the temperature for 3-5 hours, heating to a temperature of 650-690 DEG C, keeping the temperature for 32 hours, cooling to a temperature of 400 DEG C at a speed of 43 DEG C/hour, and then cooling to a normal temperature at a speed of 20 DEG C/hour. The mold steel has excellent toughness and cutability, thereby prolonging the life of a tool. At the same time, the mold steel can maintain regular performance and has excellent polishability and wear resistance.
Description
Technical field
The present invention relates to a kind of die steel, specifically belong to hot-forging die transfer mold die steel.
Background technology
The die steel being used for producing mould for plastics needs to have following characteristic:
(1) minute surface finishability (mirror finish workability) is good, not easily pin hole and small pit occurs;
(2) processibility (satinizing workability) of polishing is good;
(3) anticorrosive good with getting rusty property;
(4) intensity, wear resistance and toughness are good;
(5) machinability is good.
The medium C-Mn-Cr-Mo-Fe system steel such as usual use such as JIS SCM440 are as plastic shaping die steel, but above-mentioned requirements has increased, and in addition, in recent years, the reduction of producing the time of delivery occurs as the important requirement of client.In order to reduce procedure of processing number to meet this requirement, the various steel of usual use, such as low-carbon Mn-Cr-Mo-S-Fe system steel (see JP-A-48-093518), in order to improve hardenability to above-mentioned steel (i.e. JP-A-48-093518) add Ni modification steel (JP-A-52-065557) and improve machinability contain the steel (see JP-A-58-067850 or JP-A-60-204868) of Cu without sulphur.
Above-mentioned plastic shaping steel, i.e. low-carbon Mn-Cr-Mo-S-Fe system steel and low-carbon Mn-Ni-Cr-Mo-S-Fe system steel, there is the problem that can not obtain satisfied die life, due to when forming the large size mould of maximum length about 2 meters with this steel, due to sulfide segregation etc., polishability, wear resistance and degraded toughness.The low-carbon (LC) of JP-A-58-067850 has low softening resistance without sulphur Mn-Cr-Cu-Fe system steel to scorching process of quenching back, so when it carries out nitriding treatment at about 550 DEG C, the hardness of steel is deteriorated.Low-carbon Mn-Ni-Cr-Mo (the W/2)-Cu-Fe system steel of JP-A-48-093518 are not necessarily satisfactory, this is because can not obtain enough structural hardening effects because carbon content is low.
In the Mn-Cr-Mo-system steel of the low A1 of the low-carbon and low-sulphur of JP-A-03-115523 and hypoxemia, machinability is improved due to the hardness of base material is reduced to HRC30, although so by suppressing the appearance of nonmetal impurities to improve minute surface finishability, this material has low hardness and not satisfied polishability and wear resistance.Low-carbon Mn-Cr-Mo (W)-V-Cu-Fe steel or low-carbon Mn-Ni-Cr-Mo (the W)-V-Cu-Fe steel of JP-A-07-062491 are guaranteed: namely use this steel to form large-sized mould, also the above-mentioned requirements of energy plastic shaping mould can be met, due to Cr, Mo (W/2), Cu and V, because of enough precipitation-hardenings, these steel have the machinability of the excellence of high intensity.But when using engineering plastic materials widely, polishability and wear resistance are not necessarily satisfactory.
Summary of the invention
Object of the present invention provides a kind of hot-forging die transfer mold die steel, it has excellent toughness and machinability, thus can extend the life-span of instrument, maintains conventional performance simultaneously, has excellent polishability and wear resistance.
Technical scheme of the present invention is as follows:
Hot-forging die transfer mold die steel, die steel matrix is made up of the component of following mass percent: C 0.23-0.35%, Mn 1.4-2.0%, Si 0.8-1.5%, V 0.11-0.15%, Ti 0.10-0.19%, Cr 0.8-2.0%, Ni 0.4-1.5%, W 0.21-0.8%, Nb 0.02-0.06%, Cu 0.30%-1.20%, P≤0.034%, S≤0.050%, surplus is Fe and is inevitably mingled with matter; Die steel containing said components is heated to 650-760 DEG C, insulation 5-6 hour, stove is chilled to 280-320 DEG C, and insulation 3-5 hour, reheats to 650-690 DEG C, be incubated 32 hours, be cooled to 400 DEG C, then with 20 DEG C/h, be cooled to normal temperature with 43 DEG C/h.5-6 hour is processed in liquid nitrogen under about-190 DEG C; Rise to room temperature, preserve after 24-36 hour, reheat to 240-260 DEG C, insulation 2-3 hour, air cooling.
The present invention has excellent toughness and machinability, thus can extend the life-span of instrument, maintains conventional performance simultaneously, has excellent polishability and wear resistance.
Embodiment
Hot-forging die transfer mold die steel, die steel matrix is made up of the component of following mass percent: C 0.23-0.35%, Mn 1.4-2.0%, Si 0.8-1.5%, V 0.11-0.15%, Ti 0.10-0.19%, Cr 0.8-2.0%, Ni 0.4-1.5%, W 0.21-0.8%, Nb 0.02-0.06%, Cu 0.30%-1.20%, P≤0.034%, S≤0.050%, surplus is Fe and is inevitably mingled with matter; Die steel containing said components is heated to 650-760 DEG C, insulation 5-6 hour, stove is chilled to 280-320 DEG C, insulation 3-5 hour, reheats to 650-690 DEG C, is incubated 32 hours, 400 DEG C are cooled to 43 DEG C/h, again with 20 DEG C/h, be cooled to normal temperature, under about-190 DEG C, process 5-6 hour in liquid nitrogen; Rise to room temperature, preserve after 24-36 hour, reheat to 240-260 DEG C, insulation 2-3 hour, air cooling.
The metal construction of die steel matrix has the primary phase of lower bainite.Of the present invention
powerperformance detection data is as follows:
Performance index are as follows after testing:
Hardness HRC:66-67
Bending strength: 2400-2800Mpa
Impelling strength: 60-74J/cm2
Ultimate compression strength: 2100-2300 Mpa
Wear resistance: reach D2.
Claims (2)
1. hot-forging die transfer mold die steel, is characterized in that, die steel matrix is made up of the component of following mass percent: C 0.23-0.35%, Mn 1.4-2.0%, Si 0.8-1.5%, V 0.11-0.15%, Ti 0.10-0.19%, Cr 0.8-2.0%, Ni 0.4-1.5%, W 0.21-0.8%, Nb 0.02-0.06%, Cu 0.30%-1.20%, P≤0.034%, S≤0.050%, surplus is Fe and is inevitably mingled with matter; Die steel containing said components is heated to 650-760 DEG C, insulation 5-6 hour, stove is chilled to 280-320 DEG C, and insulation 3-5 hour, reheats to 650-690 DEG C, be incubated 32 hours, be cooled to 400 DEG C, then with 20 DEG C/h, be cooled to normal temperature with 43 DEG C/h; 5-6 hour is processed in liquid nitrogen at-190 DEG C; Rise to room temperature, preserve after 24-36 hour, reheat to 240-260 DEG C, insulation 2-3 hour, air cooling.
2. hot-forging die transfer mold die steel according to claim 1, it is characterized in that, the metal construction of described die steel matrix has the primary phase of lower bainite, and described die steel has the hardness of HRC66 ~ 67.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210406238.5A CN102943216B (en) | 2012-10-23 | 2012-10-23 | Mold steel used for hot-forging mold-pressing casting mold |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210406238.5A CN102943216B (en) | 2012-10-23 | 2012-10-23 | Mold steel used for hot-forging mold-pressing casting mold |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102943216A CN102943216A (en) | 2013-02-27 |
| CN102943216B true CN102943216B (en) | 2015-04-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210406238.5A Expired - Fee Related CN102943216B (en) | 2012-10-23 | 2012-10-23 | Mold steel used for hot-forging mold-pressing casting mold |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110195186B (en) * | 2019-05-14 | 2021-02-23 | 鞍钢股份有限公司 | Ultra-thick hot-rolled high-alloy hot-work die steel and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270124A (en) * | 1989-06-30 | 1993-12-14 | The Broken Hill Proprietary Co., Ltd. | Composite roll |
| CN1955328A (en) * | 2005-10-27 | 2007-05-02 | 日立金属株式会社 | Die steel |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494457C (en) * | 2006-06-27 | 2009-06-03 | 宝山钢铁股份有限公司 | Super-thick non-hardening plastic mold steel and method for manufacturing the same |
| CN101230442A (en) * | 2007-01-22 | 2008-07-30 | 宝山钢铁股份有限公司 | Low-alloy untempered steel for plastic mould frame steel and method for manufacturing same |
| CN100494461C (en) * | 2007-03-05 | 2009-06-03 | 大连海事大学 | Alloy tool steel in multi-type super-fine carbonates |
| CN101880829B (en) * | 2010-07-09 | 2013-10-30 | 中国第一汽车集团公司 | Magnesium alloy hot die steel |
| CN101956136B (en) * | 2010-11-01 | 2012-06-27 | 机械科学研究总院先进制造技术研究中心 | Martensite-granular bainite plastic die steel and manufacturing method thereof |
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2012
- 2012-10-23 CN CN201210406238.5A patent/CN102943216B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5270124A (en) * | 1989-06-30 | 1993-12-14 | The Broken Hill Proprietary Co., Ltd. | Composite roll |
| CN1955328A (en) * | 2005-10-27 | 2007-05-02 | 日立金属株式会社 | Die steel |
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| CN102943216A (en) | 2013-02-27 |
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