Method for improving structure and performance of T92 steel welding joint and T92 steel welding joint

Abstract

The invention relates to a method for improving the structure and performance of a T92 steel welding joint. By means of a test on deposited metal and the welding joint, the weldability of heat-resistant steel of T/92 steel ferrite is analyzed, the mechanical property of the three kinds of deposited metal different in component and the welding joint is analyzed, comparative study is carried out on the weldability and the weldability of imported welding wires, the influence mechanism of the nickel content and different postweld heat treatment processes and cooling speeds on the structure and the mechanical property of the T/P92 ferrite heat-resistant steel welding joint is analyzed, and control over the preheating temperature, heat input, interlayer temperature and postweld heat treatment process of the T92 steel welding joint and the nickel content are obtained.

Description

technical field [0001] The invention relates to a method for improving the structure and performance of T92 steel welded joints and the T92 steel welded joints. Background technique [0002] In order to improve the power generation efficiency of thermal power plants, reduce CO2 gas emissions and massive fuel consumption, countries all over the world are developing supercritical and supercritical supercritical units. However, the development of materials with long service life under high temperature and high pressure has become the key to the development of supercritical and ultra-supercritical units. [0003] During the T92 welding process, the impact toughness of the welded joint is much lower than that of the base metal, which is a prominent problem encountered in the application process of T92 steel. Since the toughness of T92 steel decreases very quickly after aging, improving the toughness of welded joints before aging to increase the toughness reserve of the joint is...

AI Technical Summary

Problems solved by technology

The research on welding materials and welding processes is mainly aimed at meeting the minimum requirements of the ASME standard for the impact toughness of

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