ASTM A234: specification for piping fitting of wrought carbon steel and alloy steel for moderate and high-temperature service.

Ordering information and general requirement sees ASTM A960.


__Killed steel, forging, bars, plates, seamless or fusion-welded tubular product with filler added. “fusion-welded tubular with filler added: SAW, GTAW (filler add), GMAW”. MTC shall be cleared marking specification number, grades and date.

__If product comply another standard like, the MTC shall be stated test value, “ex. NACE MR 0175, MTC shall state hardness value, forming and heat treatment, read more in NACE MR0175 part 1, 2, 3.


__Forging or shaping operation by cold and hot forming.

__NDE may be performed either prior to or after forming on welded product.

__NDE reports must state in the MTC and available review by purchase.

Heat treatment

__Heat treatment shall be performed after forming, see para. 7 on ASTM A960

__ASTM A234 WPB most finished by normalizing, Annualizing.

__Other grades see section 7.0.

Chemical composition

__See table 1, It is identification by trace number, heat number, casting number, or heat code.

____L- ladle: test on casting, another name heat, casing.

____P- product: test on production after forming, see ASTM A960 for acceptance criteria.

__Carbon equivalent (CE) % = C n+ Mn/6 + (Cr+Mo+V)/5 +(Ni+Cu)/15: there are limit in the project specification and application.

__And other content limitation in specification, don’t forget see any foot notes in each table. If piping fitting formed from pipe, the MTC shall be stated “Material made from seamless pipe/welded pipe” and traceable heat number of pipe. NDE reports such RT/UT MP/PT shall attach to MTC if fitting made from welded tubular.

Mechanical properties

__See table 2 and ASTM A960.

__If tensile test on product, the MTC shall be stated sample dimension.


__Fitting of all grades is allowed maximum 197 HB, except WP5, WP9, WPR, WP91, WP911.

Hydrostatic test

__See ASTM A960 if PO requirement.


__Dimension and tolerance given in ASME B16.9 for butt-weld fitting, ASTM B16.11 for threading/socket weld.

Surface quality

__See ASTM A960.

Repair by welding

__Most project prohibited, please check in PO requirement.


__See section 17.

Product marking

__It is a task of welding inspection to evaluate acceptance or rejection.

__See MSS-P-25 and ASME B16.9, B16.11.

Read more material markings.


__The supplementary requirements shall apply only when specified by the purchaser in the inquiry, contract, and order such as CE%, hardness, heat treatment, NDE after forming, etc.


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Disclaimer: is based on information from multiple sources and our experience with welding and inspection scopes. It is not a replacement for manufacturers directions and is only to provide reminders for inspector.

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