Low-alloy heat-resistant high-strength steel and member thereof

Abstract

The invention discloses a member with superior high temperature performance and small deformation, which is prepared by rationally optimizing components of the steel and controlling parameters of preparation processes such as smelting, rolling and thermal treatment on the basis of 15CrMo, wherein the room temperature tensile strength of the member is 610 MPa; the effective life of the member is twice that of 15CrMo through stress test of 600 DEG C and 200 MPa; the application temperature of the heat-resistant steel is obviously improved; the surface hardness after thermal treatment is 750 HV;the thickness of a hard layer with the hardness over 500 HV is 0.5 mm; the deformation is small; the welding property is also extremely excellent; and the member exceeds 15CrMo in all aspects.

Description

technical field [0001] The invention relates to a steel material and its components, in particular to a low-alloy heat-resistant high-strength steel and its components. Background technique [0002] Under high temperature conditions (usually refers to the temperature above 0.3-0.5 times the melting point of the material), the steel with oxidation resistance, sufficient high temperature strength and good heat resistance is called heat-resistant steel, and the most representative of heat-resistant steel One is low-alloy heat-resistant high-strength steel. For example, 15CrMo in my country is a typical low-alloy heat-resistant high-strength steel. 15CrMo is widely used in boilers, petroleum Pipelines, containers, components, etc. of large-scale equipment with harsh service conditions and complex corrosive media such as chemical industry, coal conversion, steam turbine cylinder block, thermal power, and nuclear power. [0003] However, with the rapid development of modern industr...

AI Technical Summary

Problems solved by technology

[0003] However, with the rapid development of modern industry, 15CrMo heat-resistant high-strength steel has become increasingly difficult to meet the higher requirements of industrial equipment in terms of strength, toughness, creep, weldability, etc., optimize alloy composition, adjust smelting, rolling and other production Process parameters in engineering have increasingly become the focus of people's attention to improving 15CrMo steel

At the same time, in order to obtain the required excellent wear resistance and fatigue resistance, it is necessary to perform heat treatment such as carburizing and quenching, which often causes a certain deformation of the product and affects the dimensional accuracy of the product.