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07092 Effects of Chemical Components on Resistance to Intergranular Stress Corrosion Cracking in Supermartensitic Stainless Steel

Picture for 07092 Effects of Chemical Components on Resistance to Intergranular Stress Corrosion Cracking in Sup
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Product Number: 51300-07092-SG
ISBN: 07092 2007 CP
Author: Yukio Miyata, Mitsuo Kimura, and Katsumi Masamura
Publication Date: 2007
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Low carbon martensitic stainless steels, called supermartensitic stainless steels (SMSS), have widely been applied for flowlines transporting corrosive oil and gas. However, intergranular stress corrosion cracking (IGSCC) in girth welds of the steel has become a major concern recently. A number of research works have been conducted to clarify the mechanism and to establish the measures. The most likely mechanism of IGSCC is chromium depletion on grain boundazy because it is observed in lean grade SMSS, which contains no molybdenum. However, neither depletion nor carbide of chromium has been detected so far in 2-3% Mo-added high grade SMSS, although the steel suffers IGSCC under some conditions. In order to clarify the mechanism in high grade steel, effects of chemical components on IGSCC resistance were investigated. Simulated HAZ specimens with various conditions of thermal cycles were tested in hot acid environments by U-bend SCC test. The test results showed that reduction of carbon and addition of titanium are effective to improve the resistance to IGSCC. Both would inhibit to form chromium carbide that causes to chromium depletion. Therefore, it suggests that the mechanism of IGSCC in high grade SMSS is chromium depletion, as in lean grade.
Low carbon martensitic stainless steels, called supermartensitic stainless steels (SMSS), have widely been applied for flowlines transporting corrosive oil and gas. However, intergranular stress corrosion cracking (IGSCC) in girth welds of the steel has become a major concern recently. A number of research works have been conducted to clarify the mechanism and to establish the measures. The most likely mechanism of IGSCC is chromium depletion on grain boundazy because it is observed in lean grade SMSS, which contains no molybdenum. However, neither depletion nor carbide of chromium has been detected so far in 2-3% Mo-added high grade SMSS, although the steel suffers IGSCC under some conditions. In order to clarify the mechanism in high grade steel, effects of chemical components on IGSCC resistance were investigated. Simulated HAZ specimens with various conditions of thermal cycles were tested in hot acid environments by U-bend SCC test. The test results showed that reduction of carbon and addition of titanium are effective to improve the resistance to IGSCC. Both would inhibit to form chromium carbide that causes to chromium depletion. Therefore, it suggests that the mechanism of IGSCC in high grade SMSS is chromium depletion, as in lean grade.
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Picture for 07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic
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07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic Stainless Steel

Product Number: 51300-07094-SG
ISBN: 07094 2007 CP
Author: Paul Woollin
Publication Date: 2007
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This paper describes a Joint Industry Project designed to test existing understanding of the mechanism of sensitisation to intergranular corrosion or stress corrosion cracking (IGSCC) of welded supermartensitic stainless steels.  Existing data were reviewed and two series of welding trials and corrosion tests were undertaken.
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Product Number: 51300-05095-SG
ISBN: 05095 2005 CP
Author: Yukio Miyata, Mitsuo Kimura, Haruo Nakamichi, Kaoru Sato, Noritugu Itakura, and Katsumi Masamura, JF
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