Method for producing large-thickness lamination-crack-resistant tempered high-strength steel plate

Abstract

The invention discloses a method for producing a large-thickness lamination-crack-resistant tempered high-strength steel plate. The method is characterized by comprising the steps: smelting, performing continuous casting, performing electroslag remelting, heating, rolling, annealing and performing heat treatment. The steel plate comprises the following chemical components in percentage by weight: 0.14-0.18 percent of C, 0.20-0.50 percent of Si, 0.95-1.25 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.80-1.15 percent of Ni, 0.40-0.60 percent of Cr, 0.40-0.60 percent of Mo, 0.020-0.050 percent of Nb, 0.010-0.030 percent of Ti, 0.020-0.045 percent of TAl, and the balance of Fe and inevitable impurities. According to the method, electroslag remelting treatment is adopted, good overall performance of the large-thickness steel plate with the diameter of 30mm can be met due to the reasonable controlled rolling and heat treatment process, and the production cost is reduced; and the specification range is wide. The method adopts the steps of electric furnace smelting, continuous casting and electroslag remelting smelting, the contents of P and S in the obtained tempered high-strength steel plate are low, and the steel is pure; and moreover, a large-slab electroslag remelting technology is adopted, the round ingot hammer cogging process during electroslag remelting is reduced, the production period is shortened, and the cost is obviously reduced.

Description

technical field [0001] The invention relates to a production method of quenched and tempered high-strength steel plate, in particular to a production method of large-thickness layered tear-resistant quenched and tempered high-strength steel plate. Background technique [0002] The number of high-quality alloy steel and special alloys required by modern industrial production is increasing day by day, and the quality and performance requirements of metal materials are constantly improving, especially in construction machinery, nuclear power, pressure vessels, military industry, high-quality molds and other high-quality steel plates with large thickness and single weight. Higher requirements are put forward for the mechanical properties, welding properties and Z-direction properties of steel, but ordinary smelting and casting methods cannot meet the needs, especially in terms of internal quality. [0003] In recent years, with the development of hydropower industry at home and ...

AI Technical Summary

Problems solved by technology

[0002] The number of high-quality alloy steel and special alloys required by modern industrial production is increasing day by day, and the quality and performance requirements of metal materials are constantly improving, especially in construction machinery, nuclear power, pressure vessels, military industry, high-quality molds and other high-quality steel plates with large thickness and single weight. Higher requirements are put forward for the mechanical properties, welding properties and Z-direction properties of steel, but ordinary smelting and casting methods cannot meet the needs, especially in terms of internal quality.