Dear all,
Please refer to attached stress -strain graph obtained during tensile testing of SA 106 Gr B pipe.
While performing tensile testing of SA 106 pipes for Div 1 vessels ,we were not getting yield point even though required tensile strength is obtained.
The specimen were taken in both transverse and longitudinal direction from half thickness.
Kindly share your experience in finding the root cause..
Please inform if any further details is required for clarity.
Best regards,
Padmasanker,
Quality coordinator,
Bilfal heavy industries ltd.
That is because we define as Yield Point the stress at 0,2% permanent elongation
best regards
Dr. Georgios Dilintas
Authorized Nuclear Inspector
Authorized Inspector Supervisor
I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE
Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
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Just to endorse the statements below and to confirm that there is nothing unusual in finding that many grades of steel (and most other metals) do not have a defined yield point and we take the 0.2% proof stress as being ‘yield’ for design purposes. One exception is pipeline steels (many of which do not have clear yield point) but where we follow US practice and take as ‘yield’ the intercept with the stress strain curve corresponding to the 0.5% total strain. However if in doubt take the 0.2% proof stress as defined in Mohan Ananthanarayanan’s email below.
Alan
Alan Denney
AKD Materials Consulting Ltd
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