ASTM A333 / SA333 Gr 8 Low Temperature Steel Pipe
ASTM A333 / SA333 Gr 8 covers seamless and welded steel pipes specifically designed for low-temperature service. Unlike the carbon steel grades, Grade 8 contains higher nickel content, which provides exceptional toughness, ductility, and impact resistance in extremely cold environments. This makes it a preferred material for cryogenic applications, LNG plants, and offshore projects where temperatures can fall well below –100°C.
Key Features
- Alloyed with 3.5% nickel for superior cryogenic performance
- Excellent impact strength at very low temperatures
- Available in both seamless and welded types
- Good weldability and workability
- Widely used in cryogenic systems and LNG pipelines
ASTM A333 / SA333 Gr 8 Chemical Composition
Element |
Composition (%) |
Carbon (C) |
0.13 max |
Manganese (Mn) |
0.90 max |
Phosphorus (P) |
0.025 max |
Sulfur (S) |
0.025 max |
Silicon (Si) |
0.13 – 0.32 |
Nickel (Ni) |
3.18 – 3.82 |
ASTM A333 / SA333 Gr 8 Mechanical Properties
Property |
Requirement |
Tensile Strength (MPa) |
520 min |
Yield Strength (MPa) |
345 min |
Elongation (%) |
22 min |
Impact Test (–195°C) |
Required (Charpy V-Notch) |
Heat Treatment
- Normalized
- Normalized & Tempered
- Quenched & Tempered (if required by specification)
Applications
- LNG storage and transportation pipelines
- Cryogenic equipment and plants
- Offshore oil & gas projects
- Chemical and petrochemical plants
- Shipbuilding and marine industries
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