Method for processing austenite seamless stainless steel rectangular water pipe used for turbine generator

Abstract

The invention relates to a processing method of an austenitic seamless stainless steel rectangle water pipe used for a turbo-generator, which sequentially has the processing steps of hot rolling round bar, continuous extruding round pipe, drawing an elliptic pipe with a non-core bar, drawing a rectangle pipe with a short core bar, and carrying out solution treatment and annealing to obtain the finished product. According to the mass percentage, the stainless steel which is adopted by the water pipe contains carbon less than or equal to 0.030%, silicon less than or equal to 1.0%, manganese less than or equal to 2.0%, sulphur less than or equal to 0.030 %, phosphorus less than or equal to 0.035%, chromium ranging from 18.00% to 20.00%, Ni ranging from 9.0% to 13.0%, rare earth element Re ranging from 0.002% to 0.008%, silver ranging from 0.001% to 0.005%, and iron and other impurities with the residual quantity; wherein, the rare earth element is a compound which consists of 40% to 45% of Ce, 40% to 45% of lanthanum and Yt with residual quantity according to the mass percentage. The processed water pipe has good toughness, strong corrosion resistance and low magnetic permeability, and is an ideal material used for the motor stator water pipes of 1000MW-class turbo-generators.

Description

technical field

[0001] The invention relates to a processing method for a high-strength and strong corrosion-resistant austenitic seamless stainless steel rectangular water pipe used for a 1000MW ultra-supercritical turbogenerator. Background technique

[0002] At present, the manufacture of generators is developing in the direction of large capacity, environmental protection, high efficiency, and low cost. Therefore, the key components of the stator water cooling pipe, that is, the performance and quality of the water pipe, such as strength, corrosion resistance, and magnetic permeability, are increasingly required. High, the cost requirements are getting lower and lower. The copper hollow wires widely used in 300MW and 600MW steam turbine generators cannot meet the requirements of 1000MW ultra-supercritical turbine generators due to their shortcomings such as poor strength, poor corrosion resistance, large additional loss, and high cost.

[0003] The 1000MW ultra-supercri...

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