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Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof

A technology of yield strength and ultra-high-strength steel, which is applied in the field of iron and steel metallurgy, can solve problems such as inability to produce, and achieve the effects of excellent welding performance, stable mechanical properties, and good strength

Inactive Publication Date: 2012-07-11
QINHUANGDAO SHOUQIN METAL MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Quenched and tempered ultra-high-strength steel has high requirements for various performance indicators. In the production process, the requirements for smelting, rolling, and heat treatment processes are relatively strict; High-strength steel, many enterprises are not yet able to produce

Method used

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  • Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof
  • Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof
  • Hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and production method thereof

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Embodiment Construction

[0021] According to the chemical composition range of the "1000MPa grade quenched and tempered ultra-high-strength steel" of the present invention, slab smelting, slab casting (slab specification: 250mm×1600mm×2700mm~4100mm), steel plate rolling ( Rolling specifications: 12mm, 20mm, 40mm, 50mm), quenching and tempering treatment. The actual chemical composition of quenched and tempered ultra-high-strength steel in this example is shown in Table 1:

[0022] Table 1 billet smelting composition (wt%)

[0023]

[0024] Example rolling process parameters are as shown in table 2:

[0025] Table 2 Controlled rolling process parameters

[0026]

[0027] Note: H-finished product thickness

[0028] The actual quenching process is shown in Table 3:

[0029] Table 3 Quenching heating temperature and holding time

[0030] Steel plate thickness / mm

Quenching temperature / ℃

Holding time / min

12

900±20

10

20

900±20

15

...

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PUM

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Abstract

The invention provides hardened and tempered ultrahigh-strength steel with 1000MPa-grade yield strength and a production method thereof. The steel comprises the following chemical components by weight percent: 0.15%-0.20% of C, 0.10%-0.40% of Si, 1.00%-1.50% of Mn, 0.30%-0.50% of Cr, 0.30%-0.50% of Mo, 0.20%-0.50% of Ni, 0.0010%-0.0030% of B, 0.010%-0.030% of Nb, 0.030%-0.050% of V, 0.010%-0.020% of Ti, 0.030%-0.050% of Alt, less than or equal to 0.020% of P and less than or equal to 0.010% of S. The steel can meet the property requirement of the1000MPa-grade hardened and tempered ultrahigh-strength steel.

Description

technical field [0001] The invention relates to a quenched and tempered ultra-high-strength steel with a yield strength of 1000 MPa, and a manufacturing method of the steel of this level, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] Steel for construction machinery requires materials with high strength, good impact toughness, cold formability and excellent welding performance; with the development of large-scale and light-weight construction machinery, the requirements for the above-mentioned properties are particularly prominent. Quenched and tempered ultra-high-strength steel has good strength, toughness, plasticity, weldability, etc., and has been widely used in welding structural parts of various construction machinery. come higher. In China, the production of quenched and tempered ultra-high-strength steel ≥ 1000MPa still has certain difficulties; many patents or papers only provide data in the experimental stage, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D1/25
Inventor 宋欣王根矶刘春明邹阳顾林豪陈楠何元春白学军姜中行
Owner QINHUANGDAO SHOUQIN METAL MATERIAL
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