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035451 EFFECTS OF POTENTIAL AND ENVIRONMENT ON THE STRESS CORROSION CRACKING SUSCEPTIBILITY OF NICKEL-CHROMIUM-MOLYBDENUM ALLOYS

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Product Number: 51300-03541-SG
ISBN: 03541 2003 CP
Author: G.A. Cragnolino, D.S. Dunn, Y.-M. Pan
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The effect of potential on the susceptibility to stress corrosion cracking (SCC) of Type 316L stainless steel (SS) \[UNS $31603\] and Alloy 22 \[UNS N06022\] was determined in hot, concentrated chloride solutions using precracked compact tension (CT) specimens. In the case of Alloy 22, constant deflection tests using single and double U-bend specimens were also conducted in hot, acidified and supersaturated PbC12 solutions. It was found that Alloy 22 is very resistant to crack initiation and propagation at an initial stress intensity of 47 MPam 1/2 \[43 ksi'in 1/2\] in 9.1 molal LiC1 solution at 95 °C \[203 °F\], confirming previously reported results. No crack growth was observed even when cyclic loading at a frequency of 0.001 Hz and a R ratio (R = Kimin/Kimax) of 0.7, with Klmax - 47 MPa'm 1/2 \[43 ksi'inV2\], was applied. Also, no SCC was detected in the chloride solutions containing lead species, even for thermally aged specimens. On the contrary, relatively fast crack growth was observed on Type 316L SS specimens in 9.1 molal LiC1 solution at 95 °C \[203 °F\] when the potential was above the repassivation potential for crevice corrosion, even at a stress intensity of 20 MPam 1/2 \[18 ksi'inl/2\].

Keywords: Stress corrosion cracking, localized corrosion, stainless steel, nickel base alloys, nuclear waste disposal
The effect of potential on the susceptibility to stress corrosion cracking (SCC) of Type 316L stainless steel (SS) \[UNS $31603\] and Alloy 22 \[UNS N06022\] was determined in hot, concentrated chloride solutions using precracked compact tension (CT) specimens. In the case of Alloy 22, constant deflection tests using single and double U-bend specimens were also conducted in hot, acidified and supersaturated PbC12 solutions. It was found that Alloy 22 is very resistant to crack initiation and propagation at an initial stress intensity of 47 MPam 1/2 \[43 ksi'in 1/2\] in 9.1 molal LiC1 solution at 95 °C \[203 °F\], confirming previously reported results. No crack growth was observed even when cyclic loading at a frequency of 0.001 Hz and a R ratio (R = Kimin/Kimax) of 0.7, with Klmax - 47 MPa'm 1/2 \[43 ksi'inV2\], was applied. Also, no SCC was detected in the chloride solutions containing lead species, even for thermally aged specimens. On the contrary, relatively fast crack growth was observed on Type 316L SS specimens in 9.1 molal LiC1 solution at 95 °C \[203 °F\] when the potential was above the repassivation potential for crevice corrosion, even at a stress intensity of 20 MPam 1/2 \[18 ksi'inl/2\].

Keywords: Stress corrosion cracking, localized corrosion, stainless steel, nickel base alloys, nuclear waste disposal
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02425 STRESS CORROSION CRACKING OF NICKEL-CHROMIUM-MOLYBDENUM ALLOYS IN CHLORIDE SOLUTIONS

Product Number: 51300-02425-SG
ISBN: 02425 2002 CP
Author: D.S. Dunn, Y.-M. Pan and G.A. Cragnolino
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Picture for Sulfide Stress Cracking Resistance of High Strength Low Alloy Steels with Varying Nickel Content
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Sulfide Stress Cracking Resistance of High Strength Low Alloy Steels with Varying Nickel Content

Product Number: 51319-12900-SG
Author: Karthik Krishnan
Publication Date: 2019
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Low alloy steels are one of the most commonly used material systems in oil and gas fields as they can be heat treated to appropriate strength levels including higher strengths such as 758 MPa (110 ksi) and 862 MPa (125 ksi) minimum yield strength while providing economical solutions for various oilfield conditions. Higher hardenability of low alloy steels is an important factor to ensure proper heat treatment to higher strength levels and this is typically achieved by addition of elements such as Chromium (Cr) Molybdenum (Mo) Nickel (Ni) etc. in the alloy chemistry. It is also essential to ensure adequate toughness in these high strength steels to reduce risk of brittle fracture. Increasing Ni content in the chemistry of low alloy steel can provide increased hardenability while maintaining good toughness when heat treated to high strengths. However the guidelines of NACE MR0175/ISO 15156-2 currently restrict the maximum Ni content to 1% mass fraction and in general recommend use of Cr-Mo type low alloy steels such as 41XX series in sour (H2S) service. This has generally led to exclusion of low alloy steels containing higher Ni such as 43XX series in sour service. In this paper an effort is made to evaluate the sulfide stress cracking (SSC) resistance of common grades of Cr-Mo and Ni-Cr-Mo steels heat treated to high strength using NACE TM0177 Method A testing. This would also assist when comparing the cracking resistance of high strength low alloy steels with greater than 1% mass fraction Ni content to those which are within this limit.Keywords: high strength low alloy steel Cr-Mo Ni-Cr-Mo sulfide stress cracking (SSC) 1% Nickel content
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