Industrial atmospheric corrosion resistant and high strength bolt steel for non-spraying bridge structure and manufacturing method of industrial atmospheric corrosion resistant and high strength bolt steel

Abstract

The invention provides industrial atmospheric corrosion resistant and high strength bolt steel for a non-spraying bridge structure and a manufacturing method of the industrial atmospheric corrosion resistant and high strength bolt steel, and belongs to the technical field of high strength bolt steel for the bridge structure. The industrial atmospheric corrosion resistant and high strength bolt steel for the non-spraying bridge structure comprises, by weight, 0.16-0.45% of C, 0.01-2.2% of Si, 0.3-2.2% of Mn, 0.001-0.024% of P, 0.002-0.025% of S, 0.0005-0.0100% of B, 0.04-0.50% of Ti, 0.01-0.20% of V, 0.001-0.10% of Al, 0.001-0.34% of Cr, 0.2-0.5% of Cu, 0.2-1.5% of Ni and the balance Fe and trace of impurities. According to the high strength and weather resistant bolt steel, the corrosion resistance index I worked out according to the chemical composition prediction formula is larger than or equal to 6.3, the bolt steel is suitable for producing bolts with the specification range M of 16-30 mm, after the bolt steel is made into bolts in a bolt machining plant, the quenching-and-tempering heat treatment process system is combination of oil quenching of 840-920 DEG C and tempering of 380-625 DEG C, and the optimal strength and toughness match is obtained. The industrial atmospheric corrosion resistant and high strength bolt steel for the non-spraying bridge structure and the manufacturing method of the industrial atmospheric corrosion resistant and high strength bolt steel have the advantages that the bolt steel is applicable to matched connection of plates and profiles of the non-spraying bridge structure and has excellent industrial atmospheric corrosion resistance and low temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of bolt steel for bridge structures, and in particular relates to a 10.9-grade paint-free bridge structure corrosion-resistant high-strength bolt steel for industrial atmospheric environments and a manufacturing method, which is suitable for processing and manufacturing high-strength bolts with a bolt specification of M16-30mm weather resistance. Background technique [0002] With the development of large steel girder bridges towards high parameters, the requirements for the safety and reliability of bridge structures are becoming more and more stringent. This not only puts forward higher requirements for designers, but also raises a higher level for steel materials, that is, not only has high strength to meet the requirements of lightweight structures, but also has excellent low-temperature toughness and corrosion resistance to meet steel requirements. Requirements for safety, reliability and longevity of t...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a 10.9-grade paint-free bridge structure resistant to industrial atmospheric environment high-strength bolt steel and its preparation method, which solves the problem that ordinary 10.9-grade high-strength bolts are not resistant to atmospheric environment corrosion, but surface spraying requires anti-corrosion every 3 to 5 years Coating maintenance and re-corrosion coating every 10 to 15 years, and the coating process causes health hazards, environmental pollution, high coating costs, etc.

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