Thick steel plate with high strength and toughness as well as uniform performance in thickness direction and production method of thick steel plate

Abstract

A thick steel plate with high strength and toughness as well as uniform performance in the thickness direction comprises components in percentage by weight as follows: 0.03%-1% of C, 0.10%-0.32% of Si, 0.60%-1.35% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.002% of S, 0.012%-0.032% of Nb, 0.06%-0.12% of V, 1.25%-2.75% of Cu, 1.10%-2.85% of Ni, 0.0015-0.012% of Ca, 0.0015%-0.020% of Zr and (10-40)*10<-4>% of [N]. A production method comprises steps as follows: converter smelting, LF (ladle furnace) refining, RH (Ruhstahl hausen) vacuum treatment, pouring, ingot blank heating, rolling in an austenite recrystalization region, fast cooling, and air cooling to room temperature. According to the thick steel plate and the production method, a large amount of Mo or Cr is not needed to be added, and the alloy cost is low; the produced 80-120-mm thick steel plate has characteristics of high strength and toughness, good welding and hot and cold processing performance, uniform mechanical property of whole plate and the like; and heat treatment processes such as normalizing, hardening and tempering and the like are not needed, so that the production method has the advantages of low cost, simple production processes and the like.

Description

technical field [0001] The invention relates to a low-alloy structural steel and a production method thereof, in particular to a high-strength toughness thick steel plate with uniform properties along the thickness direction and a production method thereof. Background technique [0002] As we all know, low-alloy high-strength structural steel is one of the most important engineering structural materials in my country. It has high strength and toughness, good plasticity and cold and hot processing performance, and can resist overload. It is widely used in building structures and offshore platforms. , pressure vessels, boiler manufacturing, water / nuclear power plants, shipbuilding industry, oil and gas pipelines, bridge structures, heavy machinery manufacturing, transportation and other engineering fields of the national economy. With the continuous development of the national economy and science and technology, engineering construction is also becoming heavier and larger, and ...

AI Technical Summary

Problems solved by technology

[0007] The invention aims at the lack of uneven mechanical properties of the existing ultra-thick steel plate, and provides a uniform performance along the thickness direction without adding a large amount of precious metals su

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