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02044 Development of new 13Cr steel pipe with high strength and good toughness

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Product Number: 51300-02044-SG
ISBN: 02044 2002 CP
Author: Mitsuo Kimura, Yukio Miyata and Takaaki Toyooka
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Two types of new 13Cr OCTG with high strength and good toughness have been developed by controlling of microstructure. One is Nb containing 13Cr steel pipe and the other is warm reduced 13Cr steel pipe. The toughness of 13Cr steels was improved by addition of Nb. The 13Cr steel containing 0.02-0.04% of Nb with 110ksi grade of yield strength showed as good toughness as the conventional 13Cr steel with 95ksi grade of yield strength. The CO2 corrosion resistance for high strength material was same as conventional 13Cr steel pipe. The SSC resistance for new 13Cr steel was same as conventional QT type 13Cr steel pipe. Nb precipitation prevents the grain growth and improves the low temperature toughness. The warm reducing process also improves the low temperature toughness. Fine sub grain for warm reduced pipe improves the low temperature toughness, same as the Nb containing 13Cr steel. Keywords: martensitic stainless steel, seamless pipe, OCTG, CO2 corrosion, sulfide stress cracking, toughness, Nb
Two types of new 13Cr OCTG with high strength and good toughness have been developed by controlling of microstructure. One is Nb containing 13Cr steel pipe and the other is warm reduced 13Cr steel pipe. The toughness of 13Cr steels was improved by addition of Nb. The 13Cr steel containing 0.02-0.04% of Nb with 110ksi grade of yield strength showed as good toughness as the conventional 13Cr steel with 95ksi grade of yield strength. The CO2 corrosion resistance for high strength material was same as conventional 13Cr steel pipe. The SSC resistance for new 13Cr steel was same as conventional QT type 13Cr steel pipe. Nb precipitation prevents the grain growth and improves the low temperature toughness. The warm reducing process also improves the low temperature toughness. Fine sub grain for warm reduced pipe improves the low temperature toughness, same as the Nb containing 13Cr steel. Keywords: martensitic stainless steel, seamless pipe, OCTG, CO2 corrosion, sulfide stress cracking, toughness, Nb
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This paper discusses a study wherein the SSC resistance of 13Cr bar stock quenched and tempered to 22 HRC maximum hardness was tested and evaluated beyond the maximum H2S limit of 10 kPa (1.5 psi) established in NACE MR0175/ISO 15156-3 for use in sour service.

 
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