Stainless steel for heat exchanger welded pipe and manufacturing method thereof

Abstract

The invention relates to a stainless steel for a heat exchanger welded pipe and a manufacturing method thereof. The stainless steel for the heat exchanger welded pipe comprises the following components in mass by percent: less than or equal to 0.015 percent of C, 0.05-0.30 percent of Si, 0-0.30 percent of MnO, 16.0-23.0 percent of Cr, less than or equal to 0.035 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.015 percent of N, Ti, 0.03-0.12 percent of Al, Ca, Ni, Cu and O, and the balance of Fe and inevitable impurity, wherein the C and the N are totally less than or equal to 0.025 percent, the Ti is 10 times the total mass of the C and the N or 0.8 percent at most, the Ca is 0.12-0.14 times the mass of the AL, and the Ni, the Cu and the O are totally less than or equal to 0.5 percent. Through reasonable design of type and content of elements, the stainless steel has the characteristics of large heat conductivity, little expansion coefficient, excellentresistance to oxidation, excellent stress corrosion resistance, and the like, and is suitable for manufacturing parts for resisting atmosphere, steam, water and oxidability acid corrosion.

Description

Technical field [0001] The invention belongs to the field of stainless steel, and mainly relates to the smelting and manufacturing of stainless steel. Specifically, it relates to a stainless steel for heat exchanger welded pipe with good forming performance and a manufacturing method thereof. Background technique [0002] High-pressure heaters, low-pressure heaters, and condensers are important auxiliary equipment in a turbo-generator set. The performance and operational reliability of these heat exchangers will directly affect the economy and safety of the overall operation of the generator set. With the rapid development of my country's electric power industry, the number of high-parameter and large-capacity generating units is increasing. The increase in parameters and the increase in capacity also make the size of the heat exchanger larger and larger, and at the same time increase the difficulty of design and manufacture. Frequent start and stop and rapid load changes make t...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the stainless steel in the prior art cannot fully meet the current use and manufacturing requirements, and it is necessary to develop a stainless steel for heat exchanger welded pipes with high corrosion resistance, high strength, and economical production.

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