Ultrahigh strength structural steel BG960 and preparation method

Abstract

The invention belongs to technical field of special steel preparation processes, and particularly provides an ultrahigh strength structural steel BG960 and a preparation method. The structural steel comprises, by weight, 0.15%-0.17% of C, 1.10%-1.30% of Mn, 0.20%-0.30% of Si, 0.010%-0.030% of Al, 0.45%-0.55% of Cr, 0.35%-0.45% of Mo, 0.015%-0.030% of Ti, 0.020%-0.030% of Nb, 0.030%-0.040% of V, 0.020%-0.30% of Ni, 0.0010%-0.0018% of B, no more than 0.010% of P, no more than 0.002% of S, no more than 0.045% of N, no more than 0.002% of O and the balance Fe and inevitable inclusions. According to the preparation method, through control over the types and contents of components and technological parameters, the structural steel BG960 with higher toughness is obtained.

Description

technical field [0001] The invention belongs to the technical field of special steel preparation technology, and particularly provides an ultra-high-strength structural steel BG960 and a preparation method. Background technique [0002] In order to improve equipment efficiency, reduce energy consumption and reduce self-weight, construction machinery is constantly developing in the direction of high-parameterization, large-scale and light-weight. In order to meet the above requirements, a large number of high-strength steels must be used. Compared with the foreign advanced level, my country's ultra-high-strength structural plates with a yield strength of 900MPa or more cannot be completely domestically produced and need to be imported in large quantities. This production process technology heats up the experimental steel to make it austenitized, and transforms the steel plate material from austenite structure to bainite structure through controlled rolling and controlled cool...

AI Technical Summary

Problems solved by technology

[0008] 3. The shape of the steel plate is not good

[0009] In particular, thin-gauge steel plates (not greater than 6mm) basically cannot be mass-produced stably;

[0010] 4. The cost of alloying is higher