700MPa-grade high-strength weather-resistant steel plate resistant to atmospheric corrosion and production method thereof

Abstract

The invention discloses a 700MPa-grade high-strength weather-resistant steel plate resistant to atmospheric corrosion and a production method thereof, and belongs to the field of high-strength weather-resistant steel. The steel plate comprises the following main chemical components in percentage by mass: 0.06 percent to 0.09 percent of C, 0.30 percent to 0.50 percent of Si, 1.10 percent to 1.50 percent of Mn, 0.010 percent to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.60 percent to 1.00 percent of Cr, 0.03 percent to 0.07 percent of Ni, 0.25 percent to 0.40 percent of Cu, 0.020 percent to 0.045 percent of Als, 0.100 percent to 0.140 percent of Ti, less than or equal to 0.0040 percent of N, less than or equal to 0.0035 percent of O, and the balance of Fe and inevitable impurity elements; and a microscopic structure of the steel plate is quasi-polygonal ferrite and pearlite, and the pearlite content is 2 percent to 4 percent. The high-strength weather-resistant steel has good atmospheric corrosion resistance and high plasticity, and the thickness range of the plate is 1.6 to 6.0 mm.

Description

technical field [0001] The invention belongs to the field of high-strength weather-resistant steel, and more specifically relates to a 700MPa high-strength weather-resistant steel plate resistant to atmospheric corrosion and a production method thereof. Background technique [0002] Weathering steel is atmospheric corrosion-resistant steel. Compared with stainless steel, it can greatly reduce the manufacturing cost, and has good welding performance. Compared with ordinary carbon steel, it has good atmospheric corrosion resistance. widely used. At present, weather-resistant steel plates for containers mainly use SPA-H with a yield strength of 345 MPa. With the rapid development of the container transportation industry, lightweight containers, large loads, and long life are the future development trends, and weathering steel for containers is also developing in the direction of high strength and high weather resistance. Using high-strength weathering steel, on the one hand, ...

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Problems solved by technology

[0008] Aiming at the problem that the existing high-strength weather-resistant steel is difficult to produce, the present invention provides a 700MPa high-strength weather-resistant steel plate resistant to atmospheric corrosion and its production method, which is produced by a conventional hot rolling process. The high-strength weather-resistant steel has good atmospheric corrosion resistance and Strong plasticity, sheet thickness range 1.6 ~ 6.0mm

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