Preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers

Abstract

The invention relates to a preparation and heat treatment method of low-alloy heat-resistant high-strength steel memebers, which is characterized in that on the basis of 15CrMo, the steel ingredients are reasonably optimized, the heat-resistant memebers with excellent high-temperature performance and little deformation quantity are prepared and obtained through controlling preparation process parameters, such as smelting, rolling, heat treatment and the like, the room-temperature tensile strength of the memebers is 610 MPa, the effective service life of the memebers is twice that of the 15CrMo through the stress test of 200 MPa under 600 DEG C, the use temperature of the heat-resistant steel is obviously improved, the surface hardness after the heat treatment is about 750 HV, in addition,the thickness of a hardening layer with the hardness exceeding 500 HV is 0.5mm, the deformation quantity is little, in addition, the weldability is also very excellent, and the performance of the memebers in all aspects exceeds that of 15CrMo products.

Description

technical field [0001] The invention relates to a steel material component, in particular to a preparation and heat treatment method of a low-alloy heat-resistant high-strength steel component. 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 deve...

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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.