Welded structure refractory and weathering steel with yield strength being no less than 620 MPa and production method thereof

Abstract

The invention relates to a welded structure refractory and weathering steel with yield strength being no less than 620 MPa and production method thereof, and the welded structure refractory and weathering steel with the yield strength being no less than 620 MPa comprises, by mass, 0.035-0.075% of C, 0.13-0.24% of Si, 1.56-1.82% of Mn, no more than 0.003% of P, no more than 0.002% of S, 0.12-0.23%of Mo, 0.21-0.40% of W, 0.22-0.48% of Cu, 0.21-0.43% of Ni, 0.026-0.048% of Nb, 0.058-0.077% of V, 0.045-0.068% of Ti, 0.0022-0.0052% of Ca, 0.0028-0.0065% of Ta. The welded structure refractory and weathering steel with the yield strength being no less than 620 MPa has good mechanical properties, excellent fire resistance, weather resistance and resistance to laminar tearing, as well as the excellent welding property.

Description

technical field [0001] The invention belongs to the technical field of low-alloy high-strength steel manufacturing, and relates to a fire-resistant and weather-resistant steel for welded structures with a yield strength of 620 MPa and a production method thereof. Background technique [0002] With the continuous development of iron and steel metallurgy technology, structural parts such as columns and beams of steel structures have put forward new requirements for steel plate strength, fire and disaster resistance, corrosion resistance, and earthquake resistance, while ordinary steel structures are poor in the construction industry. The ability to resist fire, disaster and corrosion is facing a severe test. In recent years, metallurgists at home and abroad have actively carried out research on fire-resistant, weather-resistant, and earthquake-resistant steels. The use of fire-resistant and weather-resistant steels can not only make up for the shortcomings of ordinary steel st...

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Problems solved by technology

However, it is mainly researched and developed for steel for railway vehicles. It is produced by hot rolling and coiling process. The steel contains a large amount of Cr element, which is not conducive to steel plate welding and low temperature toughness. In addition, the steel type does not have fire resistance

[0008] In addition, China Invention Patent Application Nos. CN103695772A and CN103695773A disclose fire-resistant, weather-resistant, and earthquake-resistant building steel with a yield strength of 550 MPa and its production method, and fire-resistant, weather-resistant, and earthquake-resistant building steel with a yield strength of 690 MPa and its production method. The two invention patents The application for construction steel contains C, Si, Mn, P, S, Nb, Ti, Mo, W, Mg, O, in addition to Sb or Zr or a mixture of the two in any proportion, and the rest is Fe and unavoidable Inclusions, after hot metal desulfurization, converter smelting, vacuum treatment, adding Mg element, conventional continuous casting and heating of the billet, segmental rolling, cooling after final rolling, etc., the steel has excellent fire resistance, weather resistance and shock resistance. The overall performance is excellent, but the disadvantages of these two steels are that the welding performance and corrosion resistance are not very ideal

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