Manganese value is more

[chiru123pc]

Dear all,

We have LTCS Pipe(18" 160 sch A333 GR. 6), completed the flattening test. In the chemical analysis report shows manganese composition value is 1.49 but the range is between. 290 to 1.06

Shal we accept dis. Experts share your opinions

 

[XL83NL]

Do you own a copy of A/SA 333? Read note A on Table 1. You're clearly above the limit of note A.

 

[bobjustbob]

Is the Mn composition on the suppliers CMTR or was this a check that you performed? If the latter, what method was used to perform the check?

Also, I don't have the -18 revision of the standard but I doubt it has changed, on the chemistry table there is a footnote for grade 6 that allows Mn up to 1.35% depending on the carbon content.

Bob

 

[EdStainless]

And there is the additional tolerance on a check chemistry.
Though like Bob I am more concerned with how you measured it.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

 

[bobjustbob]

Ed,
I initially expected the same thing on the product analysis. I worked to the casting specs for years and A703 has the additional tolerances for a product analysis.

Unless it was changed in the -18 version A333 references A999. For product analysis A999 kicks you back to the material standard, the chemical testing standard A751 does not include product analysis tolerances either. A333 has a method if the product analysis if requested on the PO to be done by the supplier but does not mention a product analysis done by the purchaser. A333 does not provide extended tolerances for the product analysis. Unless there are other standards that they are working to it looks like any product analysis would need to meet the chemical requirements in A333.

Bob