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Ultrahigh-strength atmospheric-corrosion resistant steel

An atmospheric corrosion-resistant steel and ultra-high-strength technology, applied in the field of low-carbon and low-alloy steel, can solve problems such as no specific solution disclosed, and achieve the effects of ensuring weather resistance, good low-temperature toughness, and reducing costs

Inactive Publication Date: 2007-05-16
武钢集团有限公司
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AI Technical Summary

Problems solved by technology

The yield strength after controlled rolling and controlled cooling is only ≥450MPa, and the patent publication does not disclose a specific scheme for containing Mo in the steel composition

Method used

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Examples

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Embodiment Construction

[0027] Examples 1-9 of the ultra-high strength atmospheric corrosion-resistant steel of the present invention, the weight percentages of the chemical components of the steel are: C: 0.04-0.05%, Si: 0.25-0.35%, Mn: 1.75-1.9%, P: 0.013-0.016 %, S: 0.003-0.006%, Cu: 0.20-0.50%, Cr: 0.40-0.75%, Ni: 0.25-0.60%, Nb: 0.03-0.08%, Mo: 0.10-0.40%, Ti: ≤0.02%, Als: ≤ 0.035%, B: ≤ 0.003%, and the balance is Fe and impurities. The specific ingredients are shown in Table 1.

[0028] The production method of the above embodiment is as follows: the top-bottom composite blowing is carried out on an 80-ton converter in a steelmaking plant, and the molten iron deep desulfurization technology is adopted to make S≤0.005% in the molten iron; in the alloying process, Cu plate, Ni Plate, Mo-Fe, metal manganese, Si-Fe, Cr-Fe, Nb-Fe and other alloys are added at 1 / 3 of the tapping after the furnace, and the addition is completed at 2 / 3 of the tapping; after the molten steel is blown with argon, After...

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Abstract

The invention discloses a hyperstrength atmospheric corrosion-tolerant steel, which comprises the following parts: 0.01-0.07% C, 0.25-0.50% Si, 1.60-2.00% Mn, not more than 0.018% P, not more than 0.008% S, 0.20-0.50% Cu, 0.40-0.75% Cr, 0.25-0.60% Ni, 0.03-0.08% Nb, 0.10-0.40% Mo, not more than 0.02 Ti, not more than 0.035% Als, not more than 0.003% B and Fe and impurity.

Description

technical field [0001] The present invention relates to low-carbon and low-alloy steel, in particular to extra-high-strength low-carbon and low-alloy steel suitable for manufacturing atmospheric corrosion-resistant components. Background technique [0002] The hot-rolled sheet steel Domex700MC of similar strength grade produced by SSAB in Sweden has a carbon content of less than or equal to 0.12%, generally around 0.07%, and other components are mainly conventional alloying elements, through Mo and microalloying elements Nb, Ti, V The compound added to achieve the purpose of increasing strength and improving performance. The yield strength of this steel reaches 700MPa, but due to the lack of consideration of atmospheric corrosion resistance in the composition design, the steel has great limitations in applications requiring weather resistance. Aiming at the requirements of the weather-resistant use environment, the patent publication No. CN 1800428A for "An Economical Weath...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58
Inventor 陈邦文宋育来陈吉清胡敏刘志勇郑华
Owner 武钢集团有限公司
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