Material Class API-6A

AA-General Service
Carbon or low alloy steel

BB-General Service
Carbon or low alloy steel

CC-General Service
Stainless steel

DD-Sour Service a
Carbon or low alloy steel b

EE-Sour Service a
Carbon or low alloy steel b

FF-Sour Service a
Stainless steel b

HH-Sour Service a
CRA bcd

a) As defined by NACE Standard
MR0175 / ISO 15156.

b) In compliance with NACE Standard
MR0175 / ISO 15156.

c) CRA required on retained fluid wetted surfaces only; CRA cladding of low allow or stainless steel permitted.

d) CRA as defined in API 6A latest edition. NACE MR0175 / ISO 15156 definition of CRA does not apply.

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