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51315-5662-Qualification of Diffusion-Bonded Heat Exchanger Materials to NACE MR0175/ISO 15156

Picture for Qualification of Diffusion-Bonded Heat Exchanger Materials to NACE MR0175/ISO 15156
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Product Number: 51315-5662-SG
ISBN: 5662 2015 CP
Author: Xiuqing Li
Publication Date: 2015
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Qualification of Diffusion-Bonded Heat Exchanger Materials to NACE MR0175/ISO 15156
Xiuqing Li
Heatric
46 Holton Road Holton Heath
Poole Dorset BH16 6LT
United KingdomPhone: +44(0) 1202 627000 Fax: +44(0) 1202 632299 Email: xiuqing.li @meggitt.com
ABSTRACT
Dual certified SS316/316L austenitic stainless steel and 22Cr duplex stainless steel are widely used for the construction of compact diffusion-bonded heat exchangers. One of the unique features of the units is to join flat metal plates together through diffusion bonding. As there is no braze filler metals involved qualified diffusion bonding joints can have parent metal properties. Space and weight savings are the major benefits of using these exchangers in the oil and gas industry.The first part of this paper describes diffusion bonding process and presents data from mechanical testing and microstructure examination of bonded SS316/316L and 22Cr duplex. This is to demonstrate that our diffusion bonding procedures are qualified to ASME code requirements for the production of heat exchangers.The main part of this paper deals with the qualification of diffusion bonded alloys to NACE MR0175/ISO 15156 for use in specified H2S-containing environments. For SS316/316L and 22Cr duplex the primary cracking mechanism in H2S-service is stress corrosion cracking (SCC). Two heat exchanger design conditions which have specified temperature chloride concentration and H2S partial pressure were simulated for laboratory testing. Four-point bend specimens were loaded to 100% of the actual yield strength (AYS) and fully submerged to the test solutions for 720 hours. None of the samples showed any indication of SCC or pitting. Based on the results it can be concluded that diffusion bonded SS316/316L and 22 Cr duplex heat exchangers can be used for the specified sour service conditions.Key words: NACE MR0175/ISO 15156 diffusion bonding heat exchanger stainless steel stress corrosion cracking
Qualification of Diffusion-Bonded Heat Exchanger Materials to NACE MR0175/ISO 15156
Xiuqing Li
Heatric
46 Holton Road Holton Heath
Poole Dorset BH16 6LT
United KingdomPhone: +44(0) 1202 627000 Fax: +44(0) 1202 632299 Email: xiuqing.li @meggitt.com
ABSTRACT
Dual certified SS316/316L austenitic stainless steel and 22Cr duplex stainless steel are widely used for the construction of compact diffusion-bonded heat exchangers. One of the unique features of the units is to join flat metal plates together through diffusion bonding. As there is no braze filler metals involved qualified diffusion bonding joints can have parent metal properties. Space and weight savings are the major benefits of using these exchangers in the oil and gas industry.The first part of this paper describes diffusion bonding process and presents data from mechanical testing and microstructure examination of bonded SS316/316L and 22Cr duplex. This is to demonstrate that our diffusion bonding procedures are qualified to ASME code requirements for the production of heat exchangers.The main part of this paper deals with the qualification of diffusion bonded alloys to NACE MR0175/ISO 15156 for use in specified H2S-containing environments. For SS316/316L and 22Cr duplex the primary cracking mechanism in H2S-service is stress corrosion cracking (SCC). Two heat exchanger design conditions which have specified temperature chloride concentration and H2S partial pressure were simulated for laboratory testing. Four-point bend specimens were loaded to 100% of the actual yield strength (AYS) and fully submerged to the test solutions for 720 hours. None of the samples showed any indication of SCC or pitting. Based on the results it can be concluded that diffusion bonded SS316/316L and 22 Cr duplex heat exchangers can be used for the specified sour service conditions.Key words: NACE MR0175/ISO 15156 diffusion bonding heat exchanger stainless steel stress corrosion cracking
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