ASTM A333 / SA333 Gr 6 Low Temperature Carbon Steel Pipe
ASTM A333 / SA333 Gr 6 is the most commonly used grade under the ASTM A333 specification, covering seamless and welded carbon and alloy steel pipes for low-temperature service. Known for its superior toughness and strength at sub-zero temperatures, Grade 6 is widely used in cryogenic applications, oil & gas pipelines, LNG storage, and power generation.
Key Features
- Excellent performance at low temperatures
- Good weldability and machinability
- Available in seamless and welded forms
- High impact toughness at –45°C
- Globally accepted and widely used grade
ASTM A333 / ASME SA333 Gr 6 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.30 max |
| Manganese (Mn) | 0.29 – 1.06 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 min |
ASTM A333 / ASME SA333 Gr 6 Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength (MPa) | 415 min |
| Yield Strength (MPa) | 240 min |
| Elongation (%) | 30 min |
| Impact Test (–45°C) | Required (Charpy V-Notch) |
Heat Treatment
- Normalized
- Normalized & Tempered
- Quenched & Tempered (if required by specification)
Applications
- LNG pipelines and storage tanks
- Cryogenic piping systems
- Oil & Gas transmission lines
- Petrochemical and chemical plants
- Power generation boilers and heat exchangers
- Shipbuilding and offshore structures
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