geirkvaale
Mechanical
thread725-287736
Ref. earlier discussed question:
Can A333 always be used to replace A106?
I have almost the same question:
Does steel A333 Grade 6 always satisfy the requirements for A106 Grade B?
We do all testing for our products on A106 Grade B pipes and with this assume that results with A333 Gr. 6 will be equivalent or better. A client has questined this aproach, and we need to come up with a good explanation.
We have bought copies of both standards, and they are indeed very similar. Only real difference is impact testing. I have also bought ASTM A530 which is reffered to in A106 and ASTM A999 which is reffered to in A333.
For almost all requirements I find Gr. 6 to have clearly stated equal or stricter requirements than Gr. B.
The only kind of vague area is that Gr. B requires bending test, which is not required for Gr. 6, but Gr. 6 requires flattening test. I understand flattening test is considered a stricter test than bending test, to prove sufficient ductility, so I guess it can be argumented that Gr. 6 also in this area has a stricter requirement.
I cannot find any requirements in the above mentioned standards about grain size that was a concern for stanweld in refferenced thread... It may be that Gr. 6 usually has smaller grain size, but regardless of grain size it should still be accepted as Gr. B, since no requirements are given.
Anyway, after studying the standards, I feel pretty safe to state that a pipe according to A333 Grade 6 will always pass the tests required to be certified as A106 Grade B.
Any oppinions to this?
Am I on thin ice here?
Ref. earlier discussed question:
Can A333 always be used to replace A106?
I have almost the same question:
Does steel A333 Grade 6 always satisfy the requirements for A106 Grade B?
We do all testing for our products on A106 Grade B pipes and with this assume that results with A333 Gr. 6 will be equivalent or better. A client has questined this aproach, and we need to come up with a good explanation.
We have bought copies of both standards, and they are indeed very similar. Only real difference is impact testing. I have also bought ASTM A530 which is reffered to in A106 and ASTM A999 which is reffered to in A333.
For almost all requirements I find Gr. 6 to have clearly stated equal or stricter requirements than Gr. B.
The only kind of vague area is that Gr. B requires bending test, which is not required for Gr. 6, but Gr. 6 requires flattening test. I understand flattening test is considered a stricter test than bending test, to prove sufficient ductility, so I guess it can be argumented that Gr. 6 also in this area has a stricter requirement.
I cannot find any requirements in the above mentioned standards about grain size that was a concern for stanweld in refferenced thread... It may be that Gr. 6 usually has smaller grain size, but regardless of grain size it should still be accepted as Gr. B, since no requirements are given.
Anyway, after studying the standards, I feel pretty safe to state that a pipe according to A333 Grade 6 will always pass the tests required to be certified as A106 Grade B.
Any oppinions to this?
Am I on thin ice here?