Astm A333 Gr.6 Seamless Pipe

Overview

ASTM A333 Grade 6 seamless pipe is designed for low-temperature service where impact toughness is critical. The specification covers nominal wall seamless ferritic steel pipe intended for applications exposed to subzero temperatures, including energy, industrial, and infrastructure systems.

Standard & Grades

ASTM A333 (ASME S/A-333) includes multiple ferritic steel grades for low-temperature service. Among these, Grade 6 is one of the most widely used due to its balanced strength, toughness, and weldability.

Size Range

Nominal Size	1/4 in. to 24 in. OD
Wall Thickness	Schedule 10 through XXH

Chemical Composition – ASTM A333 Grade 6 (%)

C	Mn	P	S	Si	Cr	Cu	Mo	Ni	Cb	V
0.30	0.29 – 1.06	0.025	0.025	0.10 min	0.30	0.40	0.12	0.40	0.12 max	0.08 max

Mechanical Properties – ASTM A333 Grade 6

Minimum Tensile Strength	60,000 psi (415 MPa)
Minimum Yield Strength	35,000 psi (240 MPa)

Impact Test Requirements

Test Type	Charpy V-Notch (CVN)
Minimum Test Temperature	-50 °F (-45 °C)

Heat Treatment

ASTM A333 Grade 6 pipes are heat treated to control microstructure and ensure consistent low-temperature toughness and mechanical performance.

Typical Applications

ASTM A333 Gr.6 seamless pipes are commonly used in low-temperature piping systems, cryogenic services, oil and gas processing, petrochemical plants, and industrial installations operating in cold climates.