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98580 UNUSUAL STABILIZATION BEHAVIOR IN TYPE 347H SS TUBULARS FOR A REFINERY HEATER

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Product Number: 51300-98580-SG
ISBN: 98580 1998 CP
Author: S. R. Bolinger, L. E. Kolp, W. C. Fort
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Type 347H SS was specified for the tubulars in a Refinery Lube Oil Vacuum Flasher Heater. The heater was designed for tube metal temperatures of 565°C ( 1050°F), and the tubes were specified to be stabilized annealed in order to resist polythionic acid stress corrosion cracking (PTA-SCC). Testing was performed to determine if resistance to PTA-SCC had been compromised during fabrication of the heater. The test protocol was based on ASTM A-262 Practice C, the 65% nitric acid (Huey) test. All return bends failed the tests, while most of the straight tubes sections passed the tests. The columbium carbide phase was present in very large particles instead of being evenly dispersed as fine particles throughout the matrix. This compromised the effectiveness of the stabilizing anneal and reduced the resistance to PTA-SCC. Keywords: austenitic stainless steel, corrosion, stress corrosion cracking, polythionic acid, sensitization
Type 347H SS was specified for the tubulars in a Refinery Lube Oil Vacuum Flasher Heater. The heater was designed for tube metal temperatures of 565°C ( 1050°F), and the tubes were specified to be stabilized annealed in order to resist polythionic acid stress corrosion cracking (PTA-SCC). Testing was performed to determine if resistance to PTA-SCC had been compromised during fabrication of the heater. The test protocol was based on ASTM A-262 Practice C, the 65% nitric acid (Huey) test. All return bends failed the tests, while most of the straight tubes sections passed the tests. The columbium carbide phase was present in very large particles instead of being evenly dispersed as fine particles throughout the matrix. This compromised the effectiveness of the stabilizing anneal and reduced the resistance to PTA-SCC. Keywords: austenitic stainless steel, corrosion, stress corrosion cracking, polythionic acid, sensitization
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