High-low-temperature-toughness extra-thick corrosion-resistant steel plate with yield strength of higher than 460 MPa and production method of steel plate

Abstract

The invention discloses a high-low-temperature-toughness extra-thick corrosion-resistant steel plate with the yield strength of higher than 460 MPa and a production method of the steel plate. The steel plate contains the following chemical components in percentage by mass: 0.146-0.182% of C, 0.36-0.58% of Si, 2.02-2.35% of Mn, 0.041-0.062% of Nb, 0.121-0.162% of V, 0.022-0.051% of Ti, 0.76-1.02% of Cu, 0.77-1.08% of Ni, 0.0013-0.0034% of Hf, 0.0024-0.0076% of Mg, no more than 0.010% of P, no more than 0.003% of S, (32-62)x10<-4>% of [N], (20-48)x10<-4>% of [O], and the balance of Fe and inevitable impurities, wherein the mass percentages of part of the above chemical components have to meet the following relations: 1, the sum of 7C and Mn is equal to 3.25-3.42%; and 2, the quotient of thesum of Mg and 2Hf divided by [O] is equal to 2.16-3.12. The extra-thick corrosion-resistant steel plate has the beneficial effects that a lot of precious metals such as Mo and Cr need not be added andthe production process is simple; the produced extra-thick corrosion-resistant steel plate of 120-130 mm is high in strength, high in plasticity, low in yield ratio, high in low-temperature toughness, as well as excellent in corrosion-resistant property, anti-lamellar-tearing property, welding property and cold-hot processing property; and the property uniformity of all parts of the steel plate is high.

Description

technical field [0001] The invention relates to the technical field of manufacturing low-alloy high-strength structural steel, in particular to an extra-thick corrosion-resistant steel plate with a yield strength > 460 MPa and excellent low-temperature toughness 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 strong 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 constructio...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a yield method for the existing methods for preparing extra-thick steel plates, which have high production costs and long cycles, and cannot well solve the problems of uneven performance and corrosion resistance of various parts of extra-thick steel plates. Extra-thick corrosion-resistant steel plate with strength>460MPa and excellent low-temperature toughness and production method thereof

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