ASME SA213 vrs ASTM A213 for 304H solution annealing

[chickinwire]

Does anybody know for all H grade stainless steels why ASME SA213 does not allow in process heat treatments yet ASTM A213 does essentially for the same material?

Looking at 304H for an ASME PV boiler tubes, but finding most manufacture ASTM A 304H with in-process heat treatment which ASME SA213 does not allow.

SA213 section 6.4 states "All H grades shall be furnished in the solution-treated condition. For these grades, seperate solution heat treatemnts are required for solution annealing; in-process heat treatments are not permitted as a substitute for the seperate solution annealing treatements"

What is the difference in having a separate solution heat treatment? What effect does it have on the material?
I assume that given ASME has stuck with this requirement you can't install ASTM tubes into an ASME vessel? Can anybody shed some light on this.

 

[metengr]

A separate solution treatment results in dissolution of any carbides that could have forned during fabrication. The solutuon anneal results in optimum peoptimum performance for this material in elevated temperature service.

 

[blacksmith37]

Mills can make lax interpretations of spec requirements: an in-line solution anneal may have marginal temperature, soak time ,and quench speed. A batch process is much easier to quantify/ verify . ASME wants more tracability than ASTM .

 

[SnTMan]

chickinwire, ASTM specs that can be used in ASME work will generally have SA- or SB- prefixes rather than A- or B-.

In general no, you cannot use just any ASTM spec in ASME work. ASME Sec II, Part D lists acceptable materials.

Regards,

Mike