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09338 Heat Treatment Issues on Stainless Steel Heat Exchanger Tubes

Picture for 09338 Heat Treatment Issues on Stainless Steel Heat Exchanger Tubes
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Proper heat treatment on stainless steel (SS) heat exchanger tubes is very important to obtain the expected stress corrosion cracking (SCC) and corrosion resistance of the material. This paper will discuss three recent issues that have arisen on this topic.

Product Number: 51300-09338-SG
ISBN: 09338 2009 CP
Author: Cathleen A. Shargay, Karly Moore and John J. Wodarcyk
Publication Date: 2009
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$20.00
$20.00

Proper heat treatment on stainless steel (SS) heat exchanger tubes is very important to obtain the expected stress corrosion cracking (SCC) and corrosion resistance of the material. This paper will discuss three recent issues that have arisen on this topic. The first issue involves a review of whether 321 SS twisted tubes required heat treatment after twisting, and the results of chloride SCC tests are presented. The second issue summarizes a review of whether heat treatment of duplex SS u-bends is or is not beneficial. Case histories where heat treating of bends contributed to in-service failures are highlighted. The third issue discusses the pros and cons between furnace and electric resistance heat treatment for austenitic SS U-bends.

Keywords: heat treatment, heat exchangers, tubing, stress corrosion cracking, duplex stainless steel, austenitic stainless steel

Proper heat treatment on stainless steel (SS) heat exchanger tubes is very important to obtain the expected stress corrosion cracking (SCC) and corrosion resistance of the material. This paper will discuss three recent issues that have arisen on this topic. The first issue involves a review of whether 321 SS twisted tubes required heat treatment after twisting, and the results of chloride SCC tests are presented. The second issue summarizes a review of whether heat treatment of duplex SS u-bends is or is not beneficial. Case histories where heat treating of bends contributed to in-service failures are highlighted. The third issue discusses the pros and cons between furnace and electric resistance heat treatment for austenitic SS U-bends.

Keywords: heat treatment, heat exchangers, tubing, stress corrosion cracking, duplex stainless steel, austenitic stainless steel

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