ASTM A333 / SA333 Gr 7 Seamless and Welded Carbon Steel Pipes
ASTM A333 / SA333 Gr 7 covers seamless and welded carbon steel pipes intended for low-temperature service. This grade provides reliable toughness and strength in sub-zero conditions, making it suitable for cryogenic systems, LNG transport, and applications requiring excellent notch toughness. Grade 7 is alloyed with a small amount of nickel to enhance low-temperature impact resistance.
Key Features
- Designed for low-temperature service
- Alloyed with nickel for better toughness
- Excellent weldability and machinability
- Available in seamless and welded forms
- Ideal for cryogenic and LNG applications
ASTM A333 / SA333 Gr 7 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.19 max |
| Manganese (Mn) | 0.90 max |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.13 – 0.32 |
| Nickel (Ni) | 0.40 – 1.06 |
ASTM A333 / SA333 Gr 7 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 cryogenic storage
- Petrochemical and chemical plants
- Oil & Gas transmission pipelines
- Power plants and refineries
- Shipbuilding and offshore platforms
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