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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