Saturday, July 24, 2010

[MW:6109] SSC of carbon steels.

We are reviewing procurement spec for CS Forging ASTM A 694 F51 for
Pipeline (ASME B 31.8/31.4 design spec)
It's sour service NACE MR0175 is applicable.while idenfiying the HIC
and SSC requirements we have some doubts.
Since forging HIC is applicable if Sulphur is more than 0.025% .
while identifying SSC requirements refer to the following section A.2
in NACE MR0175

Carbon and low alloy steels shall comply with A.2.1.2 through A.2.1.9
Carbon and low alloy steels, products and components that comply with
A.2 are, with stated exceptions, qualified
in accordance with this part of NACE MR0175/ISO 15156 without further
SSC testing. Nevertheless, any SSC
testing that forms part of a materials manufacturing specification
shall be carried out successfully and the results
reported.
The majority of steels that comply with the general requirements of A.
2 are not individually listed; however, for
convenience, some examples of such steels are listed in Table A.2,
Table A.3 and Table A.4.

Here my question is our material (A694 F51 )is not identified in the
table (A.2,A.3 & A.4) even though we can comply with sections A.2.1.2
through A.2.1.9 as applicable and consider this material without any
specific SSC testing
Please provide your expertise

thanks in advance
regards,
vaithiyanathan

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