ASTM A234 fitting material specification

ASTM A234 covers wrought carbon steel and alloy steel fittings of seamless and welded construction covered by the latest revision of ASME B16.9, B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, and MSS-SP-97. These fittings are for use in pressure piping and in pressure vessel fabrication for service at moderate and elevated temperatures.

The starting material for fittings shall be fully killed steel consisting of forgings, bars, plates, and seamless or fused tubular products to which filler metal has been added and shall meet the chemical requirements in the table below.

Unless otherwise specified for carbon steel sheets and plates, the steel may be made according to the coarse-grained or fine-grained practice. Grade WP9 is made using the fine-grain method.

Chemical Composition

Mechanical Requirements

Heat Treatment

Heat Treatment Procedures-Fittings, after forming at an elevated temperature, shall be cooled to a temperature below the critical range under suitable conditions to prevent injurious defects caused by too rapid cooling, but in no case more rapidly than the cooling rate in still air. Heat treatment temperatures specified are metal (part) temperatures. Heattreated fittings shall be treated according to Section‎‏ 7 in specification‎‏ ASTM A960.

Referenced Documents

In addition to those reference documents listed in Specification AASTM‎‏ A960, the following list of standards apply to the ASTM‎‏ A234 specification.

ASTM Standards

• ASTM A105 Specification for Carbon Steel Forgings for Piping Applications
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• ASTM A216 Specification for Steel Castings, Carbon, Suitable for Fusion Welding, for High-Temperature Service
• ASTM A217 Specification for Steel Castings, Martensitic Stainless and Alloy, for Pressure-Containing Parts, Suitable for High-Temperature Service
• ASTM A960 Specification for Common Requirements for Wrought Steel Piping Fittings

ASME Standards

• ASME B16.9 Steel Butt-Welding Fittings
• ASME B16.11 Forged Steel Fittings, Socket Welding and Threaded

ASME Boiler and Pressure Vessel Code

• Section V, Section VIII, Division‎‏ 1, Section‎‏ IX

MSS Standards

• MSS-SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions
• MSS-SP-79 Socket Welding Reducer Inserts
• MSS-SP-83 Steel Pipe Unions, Socket-Welding and Threaded
• MSS-SP-95 SwageNipples and Bull Plugs
• MSS-SP-97 Integrally Reinforced Forged Branch Outlet Fittings—Socket Welding, Threaded and Buttwelding Ends

Frequently used ASTM Grades

Material	Pipes	Fittings	Flanges	Valves	Bolts Nuts
Carbon Steel	A106 Gr A	A234 Gr WPA	A105	A216 Gr WCB	A193 Gr B7 A194 Gr 2H
	A106 Gr B	A234 Gr WPB	A105	A216 Gr WCB
	A106 Gr C	A234 Gr WPC	A105	A216 Gr WCB
Carbon Steel Alloy High-Temp	A335 Gr P1	A234 Gr WP1	A182 Gr F1	A217 Gr WC1	A193 Gr B7 A194 Gr 2H
	A335 Gr P11	A234 Gr WP11	A182 Gr F11	A217 Gr WC6
	A335 Gr P12	A234 Gr WP12	A182 Gr F12	A217 Gr WC6
	A335 Gr P22	A234 Gr WP22	A182 Gr F22	A217 Gr WC9
	A335 Gr P5	A234 Gr WP5	A182 Gr F5	A217 Gr C5
	A335 Gr P9	A234 Gr WP9	A182 Gr F9	A217 Gr C12
Carbon Steel Alloy Low-Temp	A333 Gr 6	A420 Gr WPL6	A350 Gr LF2	A352 Gr LCB	A320 Gr L7 A194 Gr 7
	A333 Gr 3	A420 Gr WPL3	A350 Gr LF3	A352 Gr LC3
Austenitic Stainless Steel	A312 Gr TP304	A403 Gr WP304	A182 Gr F304	A182 Gr F304	A193 Gr B8 A194 Gr 8
	A312 Gr TP316	A403 Gr WP316	A182 Gr F316	A182 Gr F316
	A312 Gr TP321	A403 Gr WP321	A182 Gr F321	A182 Gr F321
	A312 Gr TP347	A403 Gr WP347	A182 Gr F347	A182 Gr F347

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