ASTM A333 / SA333 Gr 4 Low Temperature Carbon Steel Pipe
ASTM A333 Gr 4 is a low-temperature carbon steel pipe designed for use in sub-zero environments. Part of the ASTM A333 / ASME SA333 specification, Grade 4 provides high strength and toughness, making it ideal for cryogenic and other low-temperature applications in the oil & gas, chemical, and power industries.
Key Features
- Low-temperature service suitability
- Excellent impact toughness at sub-zero temperatures
- Good weldability and formability
- Available in seamless and welded types
- Suitable for cryogenic pipelines, LNG applications, and industrial piping
ASTM A333 / SA333 Gr 4 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30 max |
| Manganese (Mn) | 0.40 – 1.06 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 min |
| Nickel (Ni) | 3.18 – 3.82 |
ASTM A333 / SA333 Gr 4 Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength (MPa) | 485 min |
| Yield Strength (MPa) | 260 min |
| Elongation (%) | 30 min |
| Impact Test (–45°C) | Required (Charpy V-Notch) |
Heat Treatment
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Pipes are supplied in normalized, normalized & tempered, or quenched & tempered condition depending on application requirements.
Applications
- Cryogenic Pipelines: Transportation of LNG, liquid nitrogen, and other cryogenic fluids
- Oil & Gas Industry: Pipelines, storage tanks, and processing units operating at low temperatures
- Chemical & Petrochemical Plants: Process piping and storage vessels for low-temperature chemicals
- Power Generation: Low-temperature boilers, heat exchangers, and condensers
- Shipbuilding & Offshore: Subsea pipelines, LNG carriers, and offshore structures
- Refineries: Low-temperature process piping and storage systems
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