ASTM A333 Seamless and Welded Steel Pipes

Nov 28, 2025 Leave a message

ASTM A333 pipes description

The ASTM A333 standard classifies steel pipes into two types: seamless and welded, suitable for low-temperature and other applications requiring notch toughness. These steel pipes are primarily used in equipment operating in cryogenic environments, such as oil and gas pipelines, liquefied natural gas transportation, and other industrial piping systems.

ASTM A333 Chemical Composition Requirements

Chemical Composition of ASTM A333
Element	Grade 1, %	Grade 3, %	Grade 4, %	Grade 6, %	Grade 7, %	Grade 8, %	Grade 9, %	Grade 10, %	Grade 11, %
C	0.30	0.19	0.12	0.30	0.19	0.13	0.20	0.20	0.10
Mn	0.40–1.06	0.31–0.64	0.50–1.05	0.29–1.06	0.90	0.90	0.40–1.06	1.15–1.50	0.60
P	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.035	0.025
S	0.025	0.025	0.025	0.025	0.025	0.025	0.025	0.015	0.025
Si	...	0.18–0.37	0.08–0.37	0.10 min	0.13–0.32	0.13–0.32	...	0.10–0.35	0.35
Ni	...	3.18–3.82	0.47–0.98	0.40	2.03–2.57	8.40–9.60	1.60–2.24	0.25	35.0–37.0
Cr	...	...	0.44–1.01	0.30	...	...	...	0.15	0.50
Cu	...	...	0.40–0.75	0.40	...	...	0.75–1.25	0.15	...
Al	...	...	0.04–0.30	...	...	...	...	0.06	...
V	...	...	...	0.08	...	...	...	0.12	...
Cb	...	...	...	0.02	...	...	...	0.05	...
Mo	...	...	...	0.12	...	...	...	0.05	0.50
Co	...	...	...	...	...	...	...	...	0.50

ASTM A333 Mechanical Properties

ASTM A333	Tensile Strength, min.		Yield Strength, min.		Elongation %, min.
Grade	psi	MPa	psi	MPa	Longitudinal	Transverse
Grade 1	55 000	380	30 000	205	35	25
Grade 3	65 000	450	35 000	240	30	20
Grade 4	60 000	415	35 000	240	30	16.5
Grade 6	60 000	415	35 000	240	30	16.5
Grade 7	65 000	450	35 000	240	30	22
Grade 8	100 000	690	75 000	515	22	...
Grade 9	63 000	435	46 000	315	28	...
Grade 10	80 000	550	65 000	450	22	...
Grade 11	65 000	450	35 000	240	18	...

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