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API Standard 6A718 Inclusion of Additional Alloy 718 Strength Classes – J une Update

API Standard 6A718 Inclusion of Additional Alloy 718 Strength Classes – J une Update. Acceptance of alloy 718 at 140 ksi min yield strength. Rashmi Bhavsar Global Materials Métier Manager Schlumberger June 2012. Agenda. Background Inclusion of 718 -140 Corrosion testing.

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API Standard 6A718 Inclusion of Additional Alloy 718 Strength Classes – J une Update

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  1. API Standard 6A718 Inclusion of Additional Alloy 718 Strength Classes – June Update Acceptance of alloy 718 at 140 ksi min yield strength Rashmi Bhavsar Global Materials Métier Manager Schlumberger June 2012

  2. Agenda • Background • Inclusion of 718 -140 • Corrosion testing

  3. Inclusion of Additional Alloy 718 Strength Classes Background • 718 -120 ksi - API Standard 6A718, 1st and 2nd Editions • 718-140 ksi - need for inclusion • Heat treatment and microstructure discussed last meeting

  4. Mechanical Properties

  5. Inclusion of Additional Strength Level • The 140 KSI grade cannot simply be added in this manner. It will require aging temperature to be changed from 1425 - 1475 F to 1400 -1475 F for 140 grade. • The yield strength range will be 140 to 150 ksi (the current spec limits the yield strength to 145 ksi max for 120 grade) • 40HRc max remain for now (Future 43 HRc max – NACE approval will require)

  6. Initial Ballots • A Ballot in 1982 from various suppliers and Shell Development to change hardness to 40HRC max • Hardness up to 45HRc and YS up to 165 ksi • Most data were at 750 and 1670F

  7. Recent Testing Testing also successful at extremely high H2S/CO2 at 350 and 450 F – No cracks (30 days test) Courtesy : Schlumberger 500 Psi H2S, 500 psi CO2, 25%NaCl at 500oF 144 ksi actual yield strength at room temp – 100% stress level for six months Courtesy: Foroni Metals

  8. Validation Testing • With 40 HRc Max per Current MR0175 – min 3 heats • Perform 90 days four point bent beam or c-ring Or Perform 30/90 days creviced bent beam or c-ring • Perform SSRT in duplicates for information and ranking • Test 140 and 150 ksi actual yield strength • Test environment • NACE level 6 (500 psi H2S, 500 CO2 and 121,300 mg/l cl at ) 350F) Or • H2S per NACE limits at 350F Approximate cost $90 to 100K

  9. Feedback from Corrosion 2012 • Supported the validation testing idea • Testing required for Hydrogen Embrittlement • Recommendation for SSRT with hydrogen charging by Total or • perform alternate testing - Uniaxial notched tensile test with hydrogen charging • Testing procedure information being collected. • Higher temperature testing recommended

  10. Corrosion Testing being Considered • Test 718-140 ksi(actual close to 150 ksi) along with 718-120 ksi (actual 140 ksi ) • Perform 90 days 3” C-ring in duplicate from 3 suppliers min. (possibly 5) H2S-500 psi, CO2-1000 psi, Cl -180,000 ppm at 400F • SSRT – the same environment • Hydrogen embrittlement test – TBD • Quotes from three labs to be collected

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