High-strength weather-resistant steel with yield strength of 700 MPa and production method thereof

A yield strength and weathering steel technology, applied in the field of preparation of 700MPa grade high-strength weathering steel, can solve the problems of poor processing and forming, shear delamination, large strength fluctuation, etc., to achieve excellent microstructure, stable plate size, toughness and so on. The effect of low brittle transition temperature

Inactive Publication Date: 2019-06-18
RIZHAO STEEL HLDG GROUP
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Problems solved by technology

At present, domestic enterprises producing 700MPa high-strength weathering steel are gradually increasing, and the components and processes used are different. However, the finished products generally have large fluctuations in strength, poor processing and molding, shear delamination, and cracking during bending. Can not fully meet the use and manufacturing requirements

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  • High-strength weather-resistant steel with yield strength of 700 MPa and production method thereof

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Embodiment Construction

[0012] The present invention will be further described below in combination with specific embodiments and accompanying drawings.

[0013] The technical solution of the present invention is: adopting Nb-Ti microalloying process to prepare the components of 700MPa grade high-strength weathering steel, the mass percentages of the chemical components are: C: 0.05-0.09%; Si: 0.25-0.35%; Mn: 1.50-1.60 %; P: ≤0.020%; S: ≤0.005%; Cu: 0.25~0.30%; Cr: 0.30~0.40%; Ni: 0.05~0.15%; : ≤0.006%; O: ≤0.005%; the rest is Fe and unavoidable impurities.

[0014] Based on the design of low carbon and high manganese, the composition of this scheme increases the strength by adding micro-alloying elements Nb and Ti to enhance the strength, and the compounding effect of Nb, Ti and Cr elements, and finally obtains good comprehensive performance.

[0015] If the C content of the steel is too high, although the strength of the steel can be greatly improved, the plasticity of the steel will decrease, whi...

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Abstract

The invention discloses high-strength weather-resistant steel with yield strength of 700 MPa and a production method thereof, and belongs to the technical field of steel and iron production. The high-strength weather-resistant steel with the yield strength of 700 MPa is prepared from the following chemical components in percentage by mass: 0.05 to 0.09 percent of C, 0.25 to 0.35 percent of Si, 1.50 to 1.60 percent of Mn, less than or equal to 0.020 percent of P, less than or equal to 0.005 percent of S, 0.25 to 0.30 percent of Cu, 0.30 to 0.40 percent of Cr, 0.05 to 0.15 percent of Ni, 0.040 to 0.050 percent of Nb 0.10 to 0.15 percent of Ti, less than or equal to 0.006 percent of N, less than or equal to 0.005 percent of O, and the balance of Fe and unavoidable impurities. Compared with the prior art, a final product is reliable in corrosion resistance and has good weather resistance.

Description

technical field [0001] The invention relates to a steel production technology, in particular to a preparation method suitable for 700MPa high-strength weathering steel. Background technique [0002] Weather-resistant steel, that is, atmospheric corrosion-resistant steel, is a low-alloy steel series between ordinary steel and stainless steel. Weather-resistant steel is made of ordinary carbon steel with a small amount of trace elements such as phosphorus, copper, chromium, and nickel. It has the strength of high-quality steel. Toughness, plastic extension, forming, welding and cutting, abrasion, high temperature, fatigue resistance and other characteristics. The principle of weathering steel is that after adding phosphorus, copper, chromium, nickel and other trace elements to the steel, a dense and highly adherent protective film is formed on the surface of the steel, which hinders the diffusion and development of rust, protects the substrate under the rust layer, and slows d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/50C22C38/48C22C38/42C22C38/02
Inventor 刘启森薛洪涛秦哲李强刚王超赵任王欢龙马锦峰林承江吴青松赵文徐正彪
Owner RIZHAO STEEL HLDG GROUP
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