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07091 Effect of Alloying Element on Intergranular Stress Corrosion Cracking Susceptibility of Super Martensitic Stainless Steel Welded Joints in Sweet Environment

Picture for 07091 Effect of Alloying Element on Intergranular Stress Corrosion Cracking Susceptibility of Super
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Product Number: 51300-07091-SG
ISBN: 07091 2007 CP
Author: Hisashi Amaya, Kazuhiro Ogawa, Akira Taniyama, and Masakatsu Ueda
Publication Date: 2007
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The effect of alloying elements such as titanium or phosphorus, and the effect of PWHT on SCC susceptibility of super martensitic stainless steel welded joints were examined. On the basis of the sensitization mechanism due to the formation of Cr-carbides, the effect of titanium on the SCC susceptibility was determined. It is revealed that the super martensitic stainless steel (0.01C-12Cr-6.5Ni- 2.5Mo) without titanium suffered SCC in the specific region of the TTS diagram (Time - Temperature - Sensitization) during the 2nd thermal cycle of the simulation HAZ. On the other hand, the super martensitic stainless steel of the Ti-alloyed type (0.01C-12Cr-6.5Ni-2.5Mo-0.1Ti) was immune to SCC in the same thermal cycle conditions. From these results, titanium is considered to prevent the formation of Cr-carbide, which can promote the Cr-depletion along the prior austenite grain boundary, by TiC formation. However, even if the titanium could suppress the Cr-carbide formation, it was reported that the Ti-alloyed high grade steel girth welds in as-welded condition showed IGSCC along the high temperature HAZ. Therefore, in this study, the effect of phosphorus was also examined. It was revealed that the SCC susceptibility of the welded joints in as-welded condition decreased with the lowering of the phosphorus content in steels. The TEM observation revealed that Cr-depletion along the grain boundary in the vicinity of the surface oxide layer on HAZ disappeared after PWHT, and molybdenum enrichment along the grain boundary was also observed after PWHT. The Laves (?) phase which contained phosphorus was observed on the grain boundary after long duration PWHT. The good SCC
The effect of alloying elements such as titanium or phosphorus, and the effect of PWHT on SCC susceptibility of super martensitic stainless steel welded joints were examined. On the basis of the sensitization mechanism due to the formation of Cr-carbides, the effect of titanium on the SCC susceptibility was determined. It is revealed that the super martensitic stainless steel (0.01C-12Cr-6.5Ni- 2.5Mo) without titanium suffered SCC in the specific region of the TTS diagram (Time - Temperature - Sensitization) during the 2nd thermal cycle of the simulation HAZ. On the other hand, the super martensitic stainless steel of the Ti-alloyed type (0.01C-12Cr-6.5Ni-2.5Mo-0.1Ti) was immune to SCC in the same thermal cycle conditions. From these results, titanium is considered to prevent the formation of Cr-carbide, which can promote the Cr-depletion along the prior austenite grain boundary, by TiC formation. However, even if the titanium could suppress the Cr-carbide formation, it was reported that the Ti-alloyed high grade steel girth welds in as-welded condition showed IGSCC along the high temperature HAZ. Therefore, in this study, the effect of phosphorus was also examined. It was revealed that the SCC susceptibility of the welded joints in as-welded condition decreased with the lowering of the phosphorus content in steels. The TEM observation revealed that Cr-depletion along the grain boundary in the vicinity of the surface oxide layer on HAZ disappeared after PWHT, and molybdenum enrichment along the grain boundary was also observed after PWHT. The Laves (?) phase which contained phosphorus was observed on the grain boundary after long duration PWHT. The good SCC
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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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07096 Effect of Variation of Local pH on Stress Corrosion Cracking of Stainless Steels in High Concentration Brines

Product Number: 51300-07096-SG
ISBN: 07096 2007 CP
Author: Hisashi Amaya, Masakatsu Ueda, Masayuki Sagara, and Kazuhiko Noda
Publication Date: 2007
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07090 SCC Performance of a Super 13%Cr Martensitic Stainless Steel for OCTG: Three-Dimensional Fitness-For-Purpose Mapping According to PH2S, pH and Chloride Content

Product Number: 51300-07090-SG
ISBN: 07090 2007 CP
Author: Herve Marchebois, Jean Leyer, and Bertine Orlans-Joliet
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