S460 high-strength low-temperature structural steel and normalizing rolling preparation method thereof

Abstract

The invention discloses S460 high-strength low-temperature structural steel, and relates to the technical field of steel production. The S460 high-strength low-temperature structural steel comprises the following chemical components in percentage by mass: 0.15%-0.18% of C, 1.4%-1.6% of Mn, 0.15%-0.4% of Si, 0.04%-0.05% of Nb, 0.08%-0.10% of V, 0.008%-0.015% of Ti, 0.4%-0.6% of Ni, 0.015%-0.040% of Alt, 0.15%-0.20% of Cu, less than or equal to 0.02% of P, less than or equal to 0.005% of S, less than or equal to 0.006% of N, less than or equal to 0.30% of Cr, less than or equal to 0.10% of Mo and the balance of Fe and inevitable impurities. The high-strength low-temperature structural steel with the thickness of 60-80 mm is produced, the yield strength is higher than 460 MPa, the tensile strength is 540-720 MPa, the ductility is larger than 18%, and the low-temperature impact energy at the temperature of -50 DEG C is higher than 34 J.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a S460 high-strength low-temperature structural steel and a normalizing rolling preparation method thereof. Background technique [0002] High-strength low-temperature structural steel is a resource-saving product with high technical content and high added value. Normalized hot-rolled structural steel plates are widely used in large-scale construction machinery, construction, offshore engineering platforms, UHV power transmission Components, vehicle frame structures, pressure vessels and other fields, especially in some welded structures, some components must be made of structural steel with excellent performance in the normalized state. The traditional normalizing process is to reheat the rolled steel plate to the normalizing temperature for a certain period of time and then air cool it, which not only increases the production cost and energy consumption, but a...

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application with the publication number CN101403075A announced "a bridge steel plate with a yield strength of 460 MPa and its preparation method". The bridge steel plate with high strength, excellent low-temperature toughness, excellent weldability and certain weather resistance is obtained through the TMCP process. Where the content of precious metals such as Cu and Ni is high, the production cost of the steel plate is high

Images