CSOEM Materials Advisory Group Summer Meeting:Status Update - UNS S66286 Elevated Temperature Tensile Testing

Tim HaeberleChief Consulting Engineer – Materials and

ProcessesGE Oil & Gas24 June 2015

Background

• Issue initially raised at API SC6 Summer Meeting in 2013 by Joel Russo– Existing derating values in API 6A Appendix G and API TR6MET for ASTM UNS

S66286 (A453 Grade 660) stainless steels seem to be unrealistic– The tables indicate the strength starts to decrease, but then increases with

higher temperatures

• UNS S66286 derating values were removed from Appendix G in API 6A Errata 6

• API SRRR approved in 2014 to provide funding for new elevated temperature tensile testing .

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1220 L Street, NW • Washington, DC 20005-4070 • www.api.org

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Background - Scope of API SRRR

• Obtain ASTM A453 Grade 660 Type D stainless steel bar stock from 3 heats

• Have 1-3 independent test labs perform elevated temperature tensile testing

• The test temperatures are to be room temp, 300F, 350F, 400F, and 450F

• 3 tensile test specimens from each heat are to be tested at each temperature by each lab .

API TG Formed

1. Bill Bailey – Baker Hughes2. Chris Carlton – Chevron3. Hernan Enrique Rincon – ConocoPhillips4. Joel Russo – FMC5. Joshua Rooker – Bohler-Edelstal6. Egidio Marotta – GE7. Pat Markle – ATI Metals8. Saki Krishnamurthy – Carpenter

Technology9. Tim Haeberle – GE10. Tinsley S. Fehnel – Carpenter Technology

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Status Update – Actions Taken

Status Update – Actions Taken

• Bill Bailey raised questions regarding the potential of a low temperature aging phenomena increasing the strength of Grade 660

• Was the upward trend of the yield strength with increasing temperature evidence of an aging phenomena or something else?

• Tinsley Fehnel with Carpenter Technology coordinated a Carpenter Technology aging study

• All other TG activities were put on hold until this issue was resolved (see next slide for results) .

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1800F Solution Anneal Data

Heat TreatmentAverage Y.S.

(ksi)Average T.S. (ksi)

Average El. (%)

Average R.A. (%)

Std Dev of Y.S. (ksi)

1796F/1h/WQ + 1328F/16h 109.5 163.9 25.2 49.9 2.31796F/1h/WQ + 1328F/16h +

350F/16h109.5 164.6 25.2 49.3 0.2

1796F/1h/WQ + 1328F/16h + 400F/16h

110.4 167.2 24.8 49.8 1.6

1796F/1h/WQ + 1328F/16h + 450F/16h

109.1 162.2 25.7 50.4 1.9

Heat TreatmentAverage Y.S.

(ksi)Average T.S. (ksi)

Average El. (%)

Average R.A. (%)

Std Dev of Y.S. (ksi)

1650F/2h/WQ + 1328F/16h 116.0 172.0 23.5 44.9 1.31650F/2h/WQ + 1328F/16h +

350F/16h113.6 171.8 22.6 45.4 0.2

1650F/2h/WQ + 1328F/16h + 400F/16h

115.0 171.8 22.8 46.5 1.3

1650F/2h/WQ + 1328F/16h + 450F/16h

115.2 171.4 22.1 42.8 .041650F Solution Anneal Data

This study indicates the low temperature exposure did not increase the yield strength

Status Update – Carpenter Technology Aging Study Results

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ORIGINAL AWHEM UNS S66286 TEST

PROPOSED API HPHT PROGRAM

NEW API UNS S66286

TEST

A. Number of heats 5 3 3

B. Number of mill sources (ATI, Bohler, Carpenter Tech volunteered)

5 3 3

C. Number of test labs (company names) 3 22

(? & ?)

D. Number of test specimens per heat per test temp per lab

3 5 5

E. Raw material diameter 8.5”1.00 - 1.25”

(check lab grip size)

F. Test temperatures (number) RT, 300F, 350F, 400F, 450F (5)

RT, 300F, 350F, 400F, 450F (5)

G. Type of elevated temp tensile test (use same type of grip, std soak time, fixed strain rate, digital stress-strain data, use large TG findings)

?(ASTM E21 Mod)

?

H. Cost per elevated temp tensile test(Get quotes)

?

I. Total number of elevated temperature tensile tests (A X C X D X F)

?

J. Total cost of elevated temperature tensile tests (H X I) ?

K. Number of extra specimens per heat to be supplied to each lab

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L. Total length of bar required per heat (C X D X F) + I ?

M. Grade 660 heat treat condition

ASTM A453 Type 660 Class D, Sol Ann 1650F, Age to 105 -125 KSI

Status Update – Proposed Preliminary Test Matrix

Summary• Carpenter Technology has performed a laboratory aging study of Grade 660 and

eliminated low temperature aging as a potential cause of the upwards trend in the original AWHEM data

• The larger Elevated Temperature Testing TG has been surveying labs to identify (1) the best labs and (2) the best lab practices for elevated temperature tensile testing

• A proposed preliminary test matrix has been developed for the Grade 660 testing, but needs to be finalized by the TG

• A test procedure that can be sent to the labs needs to be generated by the TG

• Test material needs to be obtained (the mills will donate)

• Formal quotes need to be obtained from the labs for testing

• PO’s need to be issued to test labs by API . 8

Thank you.

BACKUP SLIDES

Title or Job Number | XX Month 201X See tutorial regarding confidentiality disclosures.

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Elevated Temperature Derating Data Issues

• The data in API Technical Report 6MET shows the yield strength of Grade 660 stainless steel is increasing with increasing temperature

• The yield strength of the other alloys decreases

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Manufacturer Input

• Carpenter Technology historical data shows excellent 0.2% offset yield retention– Why does Grade 660 show such excellent retention?– Data does not cover exact temperatures used by API, but does show

trend

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