[MW:14464] Sulphide Stress (SSC) and Chloride Stress Cracking (CSC) corrosion requirement

Dear Experts,

Please clarify the below mentioned particulars,

we have carried out a SDSS PQR with 12" Dia. x 8.38mm thick, matl.
grade: ASTM A 928 Cl.1 (UNS S32760), thickness qualified range: 8.38mm
to 16.76mm - carried out corrosion tests (like, pitting, crevice,
chloride stress and sulphide stress), all physical and chemical tests
are passed.

Hence for covering the thickness range, we have also carried out a PQR
with 4" Dia. x 3.05mm, matl. grade: ASTM A790 (UNS S32750), qualified
thickness range: 1.525mm to 6.1 mm. Here we got stuck up due to
Sulphide stress (test as per NACE TM-0177)and chloride stress (test as
per ASTM G-36) due to lower specimen thickness. As per NACE TM-0177
the minimum reqd. thickness for sulphide stress corrosion test is
3.81mm.

Now my PMC/Client is insisting to carry out the SSC corrosion test
also in 4" Dia. x 3.05mm PQR test coupon. (Filler wire used: ER 2594,
same batch & Lot Number used also in 12" Dia. x 8.38 mm)

Hence, kindly advise me that whether SSC test is required for the 4"
Dia. specimen or not.

Thanking You.

Govin

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