CSOEM Materials Advisory Group Summer Meeting:
Status Update - UNS S66286 Elevated Temperature
Tensile Testing
Tim Haeberle
Chief Consulting Engineer – Materials and Processes
GE Oil & Gas
24 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 .
2
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 .
1220 L Street, NW • Washington, DC 20005-4070 • www.api.org
3
Status Update – Actions Taken
API TG Formed
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Bill Bailey – Baker Hughes
Chris Carlton – Chevron
Hernan Enrique Rincon – ConocoPhillips
Joel Russo – FMC
Joshua Rooker – Bohler-Edelstal
Egidio Marotta – GE
Pat Markle – ATI Metals
Saki Krishnamurthy – Carpenter Technology
Tim Haeberle – GE
Tinsley S. Fehnel – Carpenter Technology
4
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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Status Update – Carpenter Technology Aging Study Results
Heat Treatment
Average Y.S.
(ksi)
Average T.S.
(ksi)
Average El.
(%)
Average R.A.
(%)
Std Dev of Y.S.
(ksi)
1796F/1h/WQ + 1328F/16h
1796F/1h/WQ + 1328F/16h + 350F/16h
1796F/1h/WQ + 1328F/16h + 400F/16h
1796F/1h/WQ + 1328F/16h + 450F/16h
109.5
109.5
110.4
109.1
163.9
164.6
167.2
162.2
25.2
25.2
24.8
25.7
49.9
49.3
49.8
50.4
2.3
0.2
1.6
1.9
1800F Solution Anneal Data
Heat Treatment
Average Y.S.
(ksi)
Average T.S.
(ksi)
Average El.
(%)
Average R.A.
(%)
Std Dev of Y.S.
(ksi)
1650F/2h/WQ + 1328F/16h
1650F/2h/WQ + 1328F/16h + 350F/16h
1650F/2h/WQ + 1328F/16h + 400F/16h
1650F/2h/WQ + 1328F/16h + 450F/16h
116.0
113.6
115.0
115.2
172.0
171.8
171.8
171.4
23.5
22.6
22.8
22.1
44.9
45.4
46.5
42.8
1.3
0.2
1.3
.04
1650F Solution Anneal Data
This study indicates the low temperature exposure did not increase the yield strength
1220 L Street, NW • Washington, DC 20005-4070 • www.api.org
6
Status Update – Proposed Preliminary Test Matrix
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)
volunteered)
5
3
3
C. Number of test labs (company names)
3
2
2
(? & ?)
D. Number of test specimens per heat per test temp per lab
3
5
5
8.5”
1.00 - 1.25”
(check lab grip size)
E. Raw material diameter
F. Test temperatures (number)
RT, 300F, 350F, 400F,
400F, 450F (5)
RT, 300F, 350F, 400F,
400F, 450F (5)
G. Type of elevated temp tensile test (use same type of grip, std soak
?
H. Cost per elevated temp tensile test
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
L. Total length of bar required per heat (C X D X F) + I
1220 L Street, NW • Washington, DC 20005-4070 • www.api.org
M. Grade 660 heat treat condition
(ASTM E21 Mod)
?
(Get quotes)
?
?
?
5
?
ASTM A453 Type 660
7
660 Class D, Sol Ann
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 .
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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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