ASTM A333 Grade 3 Pipe

Low-Temperature Service Carbon & Alloy Steel Pipe

ASTM A333 Grade 3 is a part of the standard specification for seamless and welded steel pipe intended for use at low temperatures. Grade 3 is specifically alloyed with approximately 3.5% Nickel, which allows the pipe to retain its notched-bar impact properties at temperatures as low as -150°F (-101°C). This makes it the primary choice for cryogenic applications and extreme cold-weather oil and gas infrastructure.

Technical Specifications

Feature	Details
Standard	ASTM A333 / ASME SA333
Grade	Grade 3 (3.5% Nickel Steel)
Min. Impact Test Temp	-150°F (-101°C)
Size Range	1/2" NB to 36" NB
Schedule	SCH 40, SCH 80, SCH 160, SCH XXS
Manufacturing	Seamless / Welded

Mechanical Properties

Property	ASTM A333 Grade 3 Value
Yield Strength (Min)	35,000 psi (240 MPa)
Tensile Strength (Min)	65,000 psi (450 MPa)
Elongation	Refer to standard elongation table

Chemical Composition (%)

Element	Percentage (Max unless specified)
Carbon (C)	0.19% max
Manganese (Mn)	0.31% - 0.64%
Phosphorus (P)	0.025% max
Sulphur (S)	0.025% max
Silicon (Si)	0.18% - 0.37%
Nickel (Ni)	3.18% - 3.82% (Critical for Low Temp)

Features and Benefits of A333 Grade 3 Pipe

Excellent impact toughness at cryogenic temperatures down to -101°C
3.5% Nickel content prevents brittle failure in extreme cold
High tensile strength suitable for high-pressure cryogenic fluid transfer
Full compliance with Charpy V-Notch impact testing requirements
Superior structural stability during rapid temperature cycles
Available in seamless construction for maximum safety and reliability

Applications & Uses

Cryogenic

Used in the transportation of liquefied gases such as Nitrogen, Oxygen, and Ethane.

Arctic Service

Primary choice for oil and gas pipelines in extremely cold geographical regions.

Chemical Plant

Ideal for process piping involving low-temperature chemical reactions and storage.