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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

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

agenda
Agenda
  • Background
  • Inclusion of 718 -140
  • Corrosion testing
inclusion of additional alloy 718 strength classes
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
inclusion of additional strength level
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)
initial ballots
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
recent testing
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

validation testing
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

feedback from corrosion 2012
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
corrosion testing being considered
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