ASTM A234

ASTM A234: American Society for Testing and Materials
For Piping Fittings of Wrought Carbon Steel and Alloy Steel Moderate and High Tmeperature Service

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Introduction
Description

ASTM A234: American Society for Testing and Materials
For Piping Fittings of Wrought Carbon Steel and Alloy Steel Moderate and High Tmeperature Service

Chemical Requirements
Grade and Marking Symbol	Composition %
Grade and Marking Symbol	C	Mn	P max	S max	Si	Cr	Mo	Ni	Cu	Others
WPB	0.30 max	0.29–1.06	0.05	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	V 0.08 max
WPC	0.35 max	0.29–1.06	0.05	0.058	0.10 min	0.40 max	0.15 max	0.40 max	0.40 max	V 0.08 max
WP1	0.28 max	0.30–0.90	0.045	0.045	0.10–0.50	…	0.44–0.65	…	…	…
WP12 CL1, WP12 CL2	0.05-0.20	0.30–0.80	0.045	0.045	0.60 max	0.80–1.25	0.44–0.65	…	…	…
WP11 CL1	0.05-0.15	0.30–0.60	0.03	0.03	0.50–1.00	1.00–1.50	0.44–0.65	…	…	…
WP11 CL2, WP11 CL3	0.05-0.20	0.30–0.80	0.04	0.04	0.50–1.00	1.00–1.50	0.44–0.65	…	…	…
WP22 CL1, WP22 CL3	0.05-0.15	0.30–0.60	0.04	0.04	0.50 max	1.90–2.60	0.87–1.13	…	…	…
WP5 CL1, WP5 CL3	0.15 max	0.30–0.60	0.04	0.03	0.50 max	4.0–6.0	0.44–0.65	…	…	…
WP9 CL1, WP9 CL3	0.15 max	0.30–0.60	0.03	0.03	1.00 max	8.0–10.0	0.90–1.10	…	…	…
WPR	0.20 max	0.40–1.06	0.045	0.05	…	…	…	1.60–2.24	0.75–1.25	…
WP91	0.08-0.12	0.30–0.60	0.02	0.01	0.20–0.50	8.0–9.5	0.85–1.05	0.40 max		V 0.18–0.25 Nb 0.06–0.10 N 0.03–0.07 Al 0.02 max Ti 0.01 max Zr 0.01 max
WP911	0.09-0.13	0.30–0.60	0.02	0.01	0.10–0.50	8.5–9.5	0.90–1.10	0.40 max		V 0.18–0.25 Nb 0.060–0.10 N0.04–0.09 Al0.02 max B 0.0003–0.006 W 0.90–1.10 Ti0.01 max Zr0.01 max

Tensile Requirements
Grade and Marking Symbol	WPB	WPC, WP11 CL2, WP12 CL2	WP1	WP11 CL1, WP22 CL1, WP5,WP9	WPR	WP11 CL3, WP22 CL3	WP91	WP911	WP12 CL1
Tensile strength, range ksi [MPa]	60–85	70–95	55–80	60–85	63–88	75–100	85–110	90–120	60–85
	[415–585]	[485–655]	[380–550]	[415–585]	[435–605]	[520–690]	[585–760]	[620–840]	[415–585]
Yield strength, min, ksi [MPa](0.2 % offset or 0.5 %extensionunder-load)	35 [240]	40 [275]	30 [205]	30 [205]	46 [315]	45 [310]	60 [415]	64 [440]	32 [220]
Elongation Requirements: As per standard