ASTM A333 Gr. 6 ERW Carbon Steel Pipes Description
A333 GR.6 seamless steel pipe is a Grade 6 seamless steel pipe manufactured according to the ASTM A333 standard. It is specifically designed for low-temperature to extremely cold environments, and has become a "star material" in the field of cryogenic engineering due to its excellent low-temperature toughness, high strength, and good weldability. The following is a detailed analysis:
Core Characteristics: The "Guardian" of Low-Temperature Toughness
Excellent Low-Temperature Toughness: The standard test temperature is -50°F (-45°C), and it is often used in even lower temperature scenarios (subject to design safety factors). Its high impact energy (KV2) value ensures that it is not prone to brittle fracture at low temperatures.
Through fine-grained normalizing treatment, the microstructure is optimized, improving the material's toughness and adapting to a wide range of temperature changes from room temperature to cryogenics.
High Strength and Reliability: High tensile strength and yield strength, capable of withstanding high-pressure transportation requirements, ensuring the structural stability of the pipeline system at low temperatures.
Excellent weldability: With strictly controlled carbon content (typically ≤0.30%), cold cracking is less likely during welding. It can be joined using common processes such as manual arc welding and submerged arc welding, resulting in stable post-weld performance.
Economy and practicality: Compared to lower-temperature materials (such as Grade 3, 9% Ni steel), GR.6 is more cost-effective, making it a top choice for cost-effectiveness in cryogenic engineering.
Chemical Requirements of Carbon Steel ASTM A333 Gr 6 Pipe
| Compositions | Data |
| Carbon(max.) | 0.30 |
| Manganese | 0.40–1.06 |
| Phosphorus(max.) | 0.025 |
| Sulfur(max.) | 0.025 |
| Silicon | … |
| Nickel | … |
| Chromium | … |
| Other Elements | … |
Mechanical Properties of Carbon Steel ASTM A333 Grade 6 Pipes
| Properties | Data |
| Yield strength(min) | 240Mpa |
| Tensile strength(min) | 415Mpa |
| Elongation(%) | 30/16.5 |
Test and inspection
Packaging and shipping
