CN102808129A - Niobium microalloyed Si-Mn-B series thermoformed steel plate and thermal treatment process for same - Google Patents
Niobium microalloyed Si-Mn-B series thermoformed steel plate and thermal treatment process for same Download PDFInfo
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- CN102808129A CN102808129A CN2012103075778A CN201210307577A CN102808129A CN 102808129 A CN102808129 A CN 102808129A CN 2012103075778 A CN2012103075778 A CN 2012103075778A CN 201210307577 A CN201210307577 A CN 201210307577A CN 102808129 A CN102808129 A CN 102808129A
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Abstract
The invention discloses a niobium microalloyed Si-Mn-B series thermoformed steel plate and a thermal treatment process for the same, and belongs to the technical field of thermal treatment. The niobium microalloyed Si-Mn-B series thermoformed steel plate is characterized in that a plate blank comprises the following chemical components in percentage by weight: 0.16 to 0.35 percent of C, 0.6 to 1.6 percent of Si, 1.5 to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.004 percent of S, 0.01 to 0.06 percent of Nb, less than or equal to 0.0040 percent of B and the balance of Fe and inevitable impurities. A heat treatment process system comprises austenitizing temperature of 890 to 930 DEG C, heat preservation time of 0.5 to 3 hours, water quenching after the heat preservation, tempering temperature of 190 to 290 DEG C and heat preservation time of 3 to 10 hours. A finished product steel plate has a thickness of 5 to 30mm, high mechanical properties, tensile strength reaching 1,500 to 1,700 MPa, yield strength of 1,200 to 1,300 MPa and specific elongation of 8 to 15 percent.
Description
Technical field
The invention discloses a kind of Nb-microalloying Si-Mn-B is thermoforming steel plate and thermal treatment process thereof, belongs to the thermal treatment process technology field.
Background technology
The thermoforming steel is the super-strength martensitic steel that obtains through the thermoforming technology.Be tensile strength under the normal temperature that the HS boron alloy steel plate of 500-600MPa is heated to 880-950 ℃ at first; Make it even austenitizing; Send into the interior drawing of mould that inside has cooling system then; Pressurize rapid quenching cooling afterwards makes austenite become martensite, thereby drip molding obtains the intensity sclerosis.After the stamping parts quench cooled, intensity can reach 1500 MPa.Because boron and oxygen and nitrogen unit have the intensive affinity interaction, must add some strong oxide compound and nitride forming elements when in steel, adding boron, like aluminium, titanium etc., anti-block and nitrogen element combine with boron.The boron of solid solution is segregated on the crystal boundary; Can suppress the forming core of ferritic and bainite to a certain extent, thereby improve the mechanical property of steel, the tensile strength of boron-containing steel can reach more than the 1.5GPa; Be more than 3 times of common iron intensity, be widely used in wear-resisting facility fields such as agricultural machinery, automobile.Common alloy series comprises series such as Mn-B, Mn-Mo-B, Mn-Cr-B.Yet the higher thermoforming boron steel of relevant Nb-microalloying and silicone content is reported less.For this reason, the invention discloses a kind of Nb-microalloying Si-Mn-B is thermoforming steel plate and thermal treatment process thereof, and the effect through niobium and silicon has guaranteed that each item performance index of thermoforming boron steel reach the international leading level.
Summary of the invention
The objective of the invention is to disclose a kind of Nb-microalloying Si-Mn-B is thermoforming steel plate and thermal treatment process thereof, and (weight percent) chemical composition content of its slab should meet: C 0.16%-0.35%, Si 0.6%-1.6%; Mn 1.5%-2.0%; P≤0.015%, S≤0.004%, Nb0.01%-0.06%; B≤0.0040%, surplus are Fe and unavoidable impurities.
System of heat treatment process is: austenitizing temperature 890-930 ℃, and shrend after soaking time 0.5-3 hour; Tempering temperature 190-290 ℃, air cooling after soaking time 3-10 hour.
The steel plate of thermal treatment process processing has excellent mechanical property thus, and tensile strength reaches 1500-1700MPa, ys 1200-1300MPa, unit elongation 8-15%.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed explanation.
(weight percent) chemical composition content of steel plate is: C 0.25%, and Si 1.06%, and Mn 1.67%, and P 0.015%, and S 0.003%, and Nb 0.032%, and B 0.0004%, and surplus is Fe and unavoidable impurities.
Embodiment 1
Steel plate thickness is 8mm, and its system of heat treatment process is: 900 ℃ of austenitizing temperatures, soaking time shrend after 45 minutes.200 ℃ of low-temperaturetemperings are incubated 5 hours, air cooling.Sampling detects, and its mechanical property detected value is seen table 1.
Table 1 mechanical property detected value
| Numbering | R m(MPa) | R 0.2(MPa) | A?(%) |
| 1 | 1567 | 1280 | 10.0 |
| 1 | 1546 | 1273 | 10.5 |
Embodiment 2
Steel plate thickness is 8mm, and its system of heat treatment process is: 910 ℃ of austenitizing temperatures, soaking time shrend after 45 minutes.200 ℃ of low-temperaturetemperings are incubated 5 hours, air cooling.Sampling detects, and its mechanical property detected value is seen table 2.
Table 2 mechanical property detected value
| Numbering | R m(MPa) | R 0.2(MPa) | A?(%) |
| 2 | 1555 | 1279 | 8.5 |
| 2 | 1542 | 1274 | 9.0 |
Embodiment 3
Steel plate thickness is 8mm, and its system of heat treatment process is: 920 ℃ of austenitizing temperatures, soaking time shrend after 45 minutes.200 ℃ of low-temperaturetemperings are incubated 5 hours, air cooling.Sampling detects, and its mechanical property detected value is seen table 3.
Table 3 mechanical property detected value
| Numbering | R m(MPa) | R 0.2(MPa) | A?(%) |
| 3 | 1541 | 1284 | 8.0 |
| 3 | 1550 | 1271 | 12.0 |
Claims (2)
1. a Nb-microalloying Si-Mn-B is the thermoforming steel plate, it is characterized in that by weight percentage chemical ingredients and content thereof are: C 0.16%-0.35%, Si 0.6%-1.6%; Mn 1.5%-2.0%; P≤0.015%, S≤0.004%, Nb0.01%-0.06%; B≤0.0040%, surplus are Fe and unavoidable impurities; Its mechanical property is: tensile strength reaches 1500-1700MPa, ys 1200-1300MPa, unit elongation 8-15%.
One kind according to claim 1 the Nb-microalloying Si-Mn-B of characteristic be the thermal treatment process of thermoforming steel plate, it is characterized in that system of heat treatment process is: austenitizing temperature 890-930 ℃, shrend after soaking time 0.5-3 hour; Tempering temperature 190-290 ℃, soaking time 3-10 hour, air cooling.
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| CN2012103075778A CN102808129A (en) | 2012-08-27 | 2012-08-27 | Niobium microalloyed Si-Mn-B series thermoformed steel plate and thermal treatment process for same |
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| CN2012103075778A CN102808129A (en) | 2012-08-27 | 2012-08-27 | Niobium microalloyed Si-Mn-B series thermoformed steel plate and thermal treatment process for same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760752A (en) * | 2019-10-10 | 2020-02-07 | 邯郸钢铁集团有限责任公司 | NM300XT steel strip with good formability and method for producing the same |
| CN113462970A (en) * | 2021-06-21 | 2021-10-01 | 武汉钢铁有限公司 | Steel for high-plasticity-toughness automobile structural part with tensile strength of 1800MPa produced by CSP and production method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005232581A (en) * | 2004-01-19 | 2005-09-02 | Jfe Steel Kk | Hot-forged product excellent in fatigue-strength and its producing method |
| JP2006104489A (en) * | 2004-09-30 | 2006-04-20 | Jfe Steel Kk | Wear-resistant steel superior in bendability, and manufacturing method therefor |
| CN102534423A (en) * | 2012-02-29 | 2012-07-04 | 宝山钢铁股份有限公司 | High-strength steel plate and manufacturing method thereof |
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2012
- 2012-08-27 CN CN2012103075778A patent/CN102808129A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005232581A (en) * | 2004-01-19 | 2005-09-02 | Jfe Steel Kk | Hot-forged product excellent in fatigue-strength and its producing method |
| JP2006104489A (en) * | 2004-09-30 | 2006-04-20 | Jfe Steel Kk | Wear-resistant steel superior in bendability, and manufacturing method therefor |
| CN102534423A (en) * | 2012-02-29 | 2012-07-04 | 宝山钢铁股份有限公司 | High-strength steel plate and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110760752A (en) * | 2019-10-10 | 2020-02-07 | 邯郸钢铁集团有限责任公司 | NM300XT steel strip with good formability and method for producing the same |
| CN113462970A (en) * | 2021-06-21 | 2021-10-01 | 武汉钢铁有限公司 | Steel for high-plasticity-toughness automobile structural part with tensile strength of 1800MPa produced by CSP and production method |
| CN113462970B (en) * | 2021-06-21 | 2022-06-17 | 武汉钢铁有限公司 | Steel for high-plasticity-toughness automobile structural part with tensile strength of 1800MPa produced by CSP and production method |
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Application publication date: 20121205 |