ASTM A234 Carbon Steel Alloy Steel Pipe Fitting


ASTM A234 covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ANSI B16.9, ANSI B16.11, ANSI B16.28, and MSS SP-79. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperature. Fittings differing from these ANSI and MSS standard shall be furnished in accordance with Supplementary Requirement S9.
 
Optional supplementary requirements are provided for fittings where a greater degree of examination is desired. When desired, one or more of these supplementary requirements may be specified in the order.
 
This specification does not cover cast welding fittings or fittings machined from castings. Cast steel welding fittings are governed by Specifications ASTM A216/ A 216M and A 217/ A 217M.
ASTM A234 steel pipe fittings dimensions
Standards: ANSI /ASME B16.9, B16.28, MSS-SP-43.
Outer Diameter Range: 1/2” to 48”
Thickness Range: SCH 10, sch 20, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160, SCH XXS etc.
Steel pipe fittings manufacturing types in forged, threaded, butt weld, and seamless.

This specification is expressed in both inch-pound units and in SI units. However, unless the order specifies the applicable “M” specification designation (SI units), the material shall be furnished to inch-pound units.
 
The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.Steel pipe fitting are made of carbon or alloy steel pipe, plates, profiles, to a certain shape that could make a function (Change the fluids direction or rate) in pipeline systems. Mostly these fittings includes steel elbow (45 or 90 degree bend), tee, reducer (concentric or eccentric reducer), cross, caps, nipple, flanges, gasket, studs and etc.
 
For industrial purposes, in pipeline systems usually we need to change the transmission direction; Adjust fluids (oil and gas, water, slurry) flow rate; Open or close the pipelines, etc. So to complete these activities, steel pipe fittings will be applied.ASTM A234 specification has many grades, such as WPB, WPC, WP5, WP9 WP11, WP12, WP22, WP91 and so on.
 
In these standard Grade WPB is the most common material used for medium and high temperature pipelines. W means weldable, P means pressure, B is grade b, refer to the minimum yield strength.
 
The source raw material of ASTM A234 WPB steel pipe fittings may be from steel pipe, such as ASTM A106 Gr.B and C. Also from steel plate, as ASTM A285 Gr.C, ASTM A516 Gr 70, ASTM A572 etc.ASTM A234 includes seamless and welded pipe fittings
For the seamless steel pipe fittings refers to the fittings raw material from the seamless steel pipes and tubes;
Thus the welded steel pipe fittings covers the fittings raw material from welded steel pipes.
 
It shall be noted that,
 
ASTM A234 specification does not cover cast welding fittings or fittings machined from castings.

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