CN102796953A - Niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and heat threatment technique thereof - Google Patents
Niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and heat threatment technique thereof Download PDFInfo
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- CN102796953A CN102796953A CN2012103075763A CN201210307576A CN102796953A CN 102796953 A CN102796953 A CN 102796953A CN 2012103075763 A CN2012103075763 A CN 2012103075763A CN 201210307576 A CN201210307576 A CN 201210307576A CN 102796953 A CN102796953 A CN 102796953A
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Abstract
The invention discloses a niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and a heat treatment technique thereof, belonging to the technical field of metallurgy and relating to a forming technology. The invention is characterized in that the plate blank comprises the following chemical components in percentage by weight: 0.16-0.35% of C, 0.6-1.6% of Si, 1.5-2.0% of Mn, at most 0.015% of P, at most 0.005% of S, 0.01-0.06% of Nb, 0.001-0.3% of La, and the balance of Fe and inevitable impurities. The heat treatment technique comprises the following steps: after keeping the austenitizing temperature of 890-940 DEG C for 0.5-3 hours, quenching with water; and keeping the tempering temperature of 190-300 DEG C for 3-10 hours. The finished steel plate is 5-30mm, and has favorable mechanical properties: the tensile strength is up to 1450-1700 MPa, the yield strength is 1150-1300 MPa, and the elongation percentage is 8-15%.
Description
Technical field
The invention discloses a kind of niobium lanthanum microalloying Si-Mn is thermoforming steel plate and thermal treatment process thereof, belongs to the thermal treatment process technology field.
Background technology
The main supplier of domestic automobile steel plate pays much attention to the thermoforming technology; Oneself is through having carried out the research of thermoforming high-strength vehicle plate; And successfully develop the commercial hot shaping with HS boron alloy steel plate, this can promote thermoforming technology and the development and the application that are equipped in China undoubtedly.But at present domestic only have one or two company from external introducing production line; Be used for the production of several kinds of stamping parts such as A post, B post, front and back collision bumper of several sedans such as domestic Sagitar, Magotan, Bora, Audi; Expensive very huge, domestic most automobile production producer can't bear.Motor corporations such as a domestic vapour, Cherry, lucky, Chang'an are urgently seeking to make stamping parts of automobile with this technology.Common alloy series comprises series such as Mn-B, Mn-Mo-B, Mn-Cr-B.Yet the production technique report of the thermoforming boron steel that relevant dual rare elements microalloying of niobium lanthanum and silicone content are higher is less.For this reason, the invention discloses a kind of niobium lanthanum microalloying Si-Mn is thermoforming steel plate and thermal treatment process thereof, and the effect through niobium and lanthanum 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 niobium lanthanum microalloying Si-Mn 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≤0.005%, Nb0.01%-0.06%; La0.001-0.3%, surplus is Fe and unavoidable impurities.
System of heat treatment process is: austenitizing temperature 890-940 ℃, and shrend after soaking time 0.5-3 hour; Tempering temperature 190-300 ℃, 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 1450-1700MPa, ys 1150-1300MPa, 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 0.24%, and Si 0.93%, and Mn 1.76%, and P 0.015%, and S 0.003%, and Nb 0.035%, and La 0.006%, 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 | 1491 | 1234 | 9.5 |
| 1 | 1519 | 1255 | 11.0 |
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 | 1497 | 1226 | 10.5 |
| 2 | 1502 | 1250 | 10.0 |
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 | 1492 | 1175 | 11.5 |
| 3 | 1431 | 1255 | 10.0 |
Claims (2)
1. a niobium lanthanum microalloying Si-Mn 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≤0.005%, Nb0.01%-0.06%; La0.001-0.3%, surplus is Fe and unavoidable impurities; Its mechanical property is: tensile strength 1450-1700MPa, ys 1150-1300MPa, unit elongation 8-15%.
One kind according to claim 1 a kind of niobium lanthanum microalloying Si-Mn of characteristic be the thermal treatment process of thermoforming steel plate, it is characterized in that system of heat treatment process is: austenitizing temperature 890-940 ℃, shrend after soaking time 0.5-3 hour; Tempering temperature 190-300 ℃, soaking time 3-10 hour, air cooling.
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|---|---|---|---|
| CN2012103075763A CN102796953A (en) | 2012-08-27 | 2012-08-27 | Niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and heat threatment technique thereof |
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| CN2012103075763A CN102796953A (en) | 2012-08-27 | 2012-08-27 | Niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and heat threatment technique thereof |
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| CN102796953A true CN102796953A (en) | 2012-11-28 |
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| CN2012103075763A Pending CN102796953A (en) | 2012-08-27 | 2012-08-27 | Niobium-lanthanum microalloyed Si-Mn thermoformed steel plate and heat threatment technique thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948987A (en) * | 2010-09-21 | 2011-01-19 | 武汉钢铁(集团)公司 | High-strength and high-toughness steel plate and manufacturing method thereof |
| CN102345063A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof |
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2012
- 2012-08-27 CN CN2012103075763A patent/CN102796953A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948987A (en) * | 2010-09-21 | 2011-01-19 | 武汉钢铁(集团)公司 | High-strength and high-toughness steel plate and manufacturing method thereof |
| CN102345063A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 郭洪飞等: "《稀土La对5CrNiMo模具钢力学性能的影响》", 《北京科技大学学报》, vol. 29, no. 12, 31 December 2007 (2007-12-31), pages 1209 - 1211 * |
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Application publication date: 20121128 |