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07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic Stainless Steel

Picture for 07094 Understanding and Avoiding Intergranular Stress Corrosion Cracking of Welded Supermartensitic
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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.

Product Number: 51300-07094-SG
ISBN: 07094 2007 CP
Author: Paul Woollin
Publication Date: 2007
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$20.00
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Supermartensitic stainless steels (SMSS), including both lean grades (without molybdenum) and high grades (with 2% molybdenum), have shown sensitivity to intergranular corrosion or stress corrosion cracking (IGSCC) in weld HAZs during laboratory testing in chloride solutions acidified with CO2 at above about 100°C(1-9). Also, lean SMSS grades have cracked in service when exposed to hot acidic brines(4,6). This paper describes a Joint Industry Project designed to test existing understanding of the mechanism of sensitisation to IGSCC of welded SMSS. The project also sought to determine whether IGSCC could be reliably avoided via control of the welding process or by brief PWHT. Existing data were reviewed and two series of welding trials and corrosion tests were undertaken. The review and first series of tests allowed a hypothesis of the mechanism of sensitisation in SMSS to be developed, which was then tested via the second series of tests.

Keywords: Supermartensitic stainless steel, intergranular stress corrosion cracking, post weld heat treatment

 

Supermartensitic stainless steels (SMSS), including both lean grades (without molybdenum) and high grades (with 2% molybdenum), have shown sensitivity to intergranular corrosion or stress corrosion cracking (IGSCC) in weld HAZs during laboratory testing in chloride solutions acidified with CO2 at above about 100°C(1-9). Also, lean SMSS grades have cracked in service when exposed to hot acidic brines(4,6). This paper describes a Joint Industry Project designed to test existing understanding of the mechanism of sensitisation to IGSCC of welded SMSS. The project also sought to determine whether IGSCC could be reliably avoided via control of the welding process or by brief PWHT. Existing data were reviewed and two series of welding trials and corrosion tests were undertaken. The review and first series of tests allowed a hypothesis of the mechanism of sensitisation in SMSS to be developed, which was then tested via the second series of tests.

Keywords: Supermartensitic stainless steel, intergranular stress corrosion cracking, post weld heat treatment

 

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