CN103510025A - Ultrahigh strength steel plate containing rare earth La and heat treatment process thereof - Google Patents
Ultrahigh strength steel plate containing rare earth La and heat treatment process thereof Download PDFInfo
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- CN103510025A CN103510025A CN201210205566.9A CN201210205566A CN103510025A CN 103510025 A CN103510025 A CN 103510025A CN 201210205566 A CN201210205566 A CN 201210205566A CN 103510025 A CN103510025 A CN 103510025A
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Abstract
Belonging to the technical field of iron and steel material heat treatment, the invention relates to an ultrahigh strength steel plate containing rare earth La and a heat treatment process thereof. The steel plate comprises the following chemical components (wt%): 0.25%-0.30% of C, 1.0%-1.6% of Si, 1.5%-2.0% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.18%-0.28% of Cr, 0.2%-0.4% of Ni, 0.05%-0.2% of Mo, 0.10%-0.20% of Cu, greater than or equal to 0.03% of Al, 0.001%-0.1% of La, and the balance Fe and unavoidable impurities. According to the heat treatment process: the austenitizing temperature is 900-950DEG C, the temperature preservation time is 0.5-3h, and then water quenching is conducted; the tempering temperature is 220-280DEG C, and the temperature preservation time is 1-30h. The steel plate produced by the heat treatment process has excellent mechanical properties, tensile strength of more than 1500MPa, yield strength of more than 1300MPa, and elongation of greater than 10%. With a low production cost, the process can be used for industrial production of steel plates with thickness of 5-25mm.
Description
Technical field
The present invention relates to a kind of ultrahigh-strength steel plates and thermal treatment process thereof containing rare earth La, belong to ferrous materials heat treatment technics field.
Background technology
At present, that the ultrahigh-strength steel plates that yield strength is greater than 1GPa mainly be take is low, medium carbon steel is as main, adds alloying element with Cr-Ni-Mo, Cr-Mn-Mo, and Cr-Ni-Mn-Mo is more.Under the certain condition of carbon content, although by adding the alloying element can crystal grain thinning, improve mechanical property and barrier propterty.Yet, for the requirement of high-hardenability, can not only rely on above-mentioned alloy system design.Should consider to utilize the good metallurgy condition of ultra-clean steel water extraction confession, by adding rare earth element and obtaining and meet the high-end demand of steel plate for national economy every profession and trade in conjunction with thermal treatment.
Rare earth element adds as alloying element, mainly works to change beginning temperature MS and the final temperature Mf of martensitic transformation, thereby reduces retained austenite quantity in steel, and then obtains martensitic fine structure.The metal activity of rare-earth elements of lanthanum is only second to alkali and alkaline earth metal ions, and lanthanum adds in Clean Steel, can change the microstructure morphology of steel, the inclusion and improve inclusion morphology of can going bad, and has improved the performance of Clean Steel.It by process systems such as accurate control heating, rolling, thermal treatments, is the key factor that obtains high-performance ultrahigh-strength steel plates.The invention discloses a kind of ultrahigh-strength steel plates and thermal treatment process thereof containing rare earth La, fully utilized the advantage of rare earth La and other alloying elements, by thermal treatment, obtained yield strength up to ultrahigh-strength steel plates more than 1300MPa.
Summary of the invention
The object of this invention is to provide a kind of ultrahigh-strength steel plates and thermal treatment process thereof containing rare earth La.
Realize technical scheme of the present invention as described below, the steel plate that contains following chemical composition is put into process furnace and heat-treat heating, after insulation for some time, carry out shrend and low-temperaturetempering and process.
The chemical composition of steel plate and content (weight percent) are: C0.25%-0.30%, Si1.0%-1.6%, Mn1.5%-2.0%, P≤0.015%, S≤0.010%, Cr0.18%-0.28%, Ni0.2%-0.4%, Mo0.05%-0.2%, Cu0.10%-0.20%, Al >=0.03%, La0.001%-0.1%, surplus is Fe and inevitable impurity.
System of heat treatment process is: austenitizing temperature 900-950 ℃, shrend after soaking time 0.5-3 hour; Tempering temperature 220-280 ℃, soaking time 1-30 hour.
The steel plate that thermal treatment process is processed thus has excellent mechanical property, and the tensile strength of sample is greater than 1500MPa, and yield strength is greater than 1300MPa, and unit elongation is greater than 10%.
Embodiment
Below in conjunction with embodiment, the present invention is explained in detail.
The chemical composition of steel plate and content (weight percent) are: C0.26%, Si1.28%, Mn1.51%, P0.015%, S0.009%, Cu0.173%, Cr0.249%, Ni0.333%, Mo0.155%, Al0.051%, La0.05%, surplus is Fe and inevitable impurity.
Embodiment 1
Steel plate thickness is 12mm, and its system of heat treatment process is: 900 ℃ of austenitizing temperatures, soaking time shrend after 44 minutes, 265 ℃ of low-temperaturetemperings, afterwards air coolings.Sampling detects, and its mechanical property detected value is in Table 1:
Table 1 mechanical property detected value
Embodiment 2
Steel plate thickness is 12mm, and its system of heat treatment process is: 920 ℃ of austenitizing temperatures, soaking time shrend after 44 minutes, 265 ℃ of low-temperaturetemperings, afterwards air coolings.Sampling detects, and its mechanical property detected value is in Table 2.
Table 2 mechanical property detected value
Claims (2)
1. containing ultrahigh-strength steel plates and the thermal treatment process thereof of rare earth La, it is characterized in that its chemical composition and content are by weight percentage: C0.25%-0.30%, Si1.0%-1.6%, Mn1.5%-2.0%, P≤0.015%, S≤0.010%, Cr0.18%-0.28%, Ni0.2%-0.4%, Mo0.05%-0.2%, Cu0.10%-0.20%, Al >=0.03%, La0.001%-0.1%, surplus is Fe and inevitable impurity.
2. a thermal treatment process for a kind of ultrahigh-strength steel plates containing rare earth La of feature as claimed in claim 1, is characterized in that the system of heat treatment process of described steel plate is: austenitizing temperature 900-950 ℃, shrend after soaking time 0.5-3 hour; Tempering temperature 220-280 ℃, soaking time 1-30 hour.
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| CN201210205566.9A CN103510025A (en) | 2012-06-21 | 2012-06-21 | Ultrahigh strength steel plate containing rare earth La and heat treatment process thereof |
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| CN201210205566.9A CN103510025A (en) | 2012-06-21 | 2012-06-21 | Ultrahigh strength steel plate containing rare earth La and heat treatment process thereof |
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| CN103510025A true CN103510025A (en) | 2014-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115874112A (en) * | 2022-11-02 | 2023-03-31 | 包头钢铁（集团）有限责任公司 | Method for manufacturing 1300MPa cold-rolled martensitic steel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101649420A (en) * | 2008-08-15 | 2010-02-17 | 宝山钢铁股份有限公司 | Ultra-strength, high toughness and low yield ratio steel and steel plate and manufacturing method thereof |
| CN102230129A (en) * | 2011-07-12 | 2011-11-02 | 内蒙古包钢钢联股份有限公司 | High-strength steel plate containing rare earth (RE) and heat treatment process thereof |
| CN102251180A (en) * | 2011-07-07 | 2011-11-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and production method thereof |
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2012
- 2012-06-21 CN CN201210205566.9A patent/CN103510025A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649420A (en) * | 2008-08-15 | 2010-02-17 | 宝山钢铁股份有限公司 | Ultra-strength, high toughness and low yield ratio steel and steel plate and manufacturing method thereof |
| CN102251180A (en) * | 2011-07-07 | 2011-11-23 | 内蒙古包钢钢联股份有限公司 | Rare-earth-containing ultrahigh strength collapse-resistant petroleum casing and production method thereof |
| CN102230129A (en) * | 2011-07-12 | 2011-11-02 | 内蒙古包钢钢联股份有限公司 | High-strength steel plate containing rare earth (RE) and heat treatment process thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115874112A (en) * | 2022-11-02 | 2023-03-31 | 包头钢铁（集团）有限责任公司 | Method for manufacturing 1300MPa cold-rolled martensitic steel |
| CN115874112B (en) * | 2022-11-02 | 2024-04-30 | 包头钢铁（集团）有限责任公司 | Manufacturing method of 1300 megapascal cold-rolled martensitic steel |
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Application publication date: 20140115 |