low alloy steel 1

[engineer54]

Is ASME SA-516-70 Normalized material considered low alloy steel?

 

[metengr]

No, by ASME terms. According to the Material Specification title, SPECIFICATION FOR PRESSURE VESSEL PLATES,CARBON STEEL, FOR MODERATE- AND LOWERTEMPERATURE SERVICE.... it would be carbon steel plate. The only reason I don't want to get in the semantics of carbon steel versus low alloy is that ASME has specific designations for low alloy steel by material specification and weldability.

 

[SnTMan]

But, at least within Sec VIII, Div 1, you could kind of say, although not with a great deal of precision, that, sort of, anything with about 1% to about 13% Cr is low alloy. Mostly.

Regards,

Mike

 

[metengr]

SnTMan;
That is exactly why you stay out of metallurgical semantics. The chemical composition ranges for SA-516 meet the category for carbon steel plate. Now you start adding spices like V, Cb, and Ti, you start moving into high strength low-alloy steels or Cr and Mo spices, and you are into families of common low-alloy steels.

 

[racookpe1978]

And "all" of those "spices" affect weld procedures, filler material, pre-heat and PWHT requirements, etc.

Etc, etc.

 

[SnTMan]

Yup