The core technical specifications, material grades, and chemical compositions of ASTM A106 seamless steel pipes are outlined in the ASTM A106 standard, which encompasses three primary grades, each optimized for specific temperature and service conditions:
Grade A: Basic grade, suitable for moderate temperature and pressure conditions. Compared to Grades B and C, it has lower carbon and manganese content, providing good weldability.
Grade B: The most commonly used grade, balancing strength, weldability, and economy. It excels in most high-temperature applications and is the preferred material for power plants and petrochemical plants.
Grade C: With the highest carbon and manganese content, it provides excellent strength characteristics and is suitable for the most demanding high-temperature and high-pressure environments.
| 等级 | 碳含量（最大值） | 锰含量 | 磷含量（最大值） | 硫含量（最大值） | 硅含量 |
|---|---|---|---|---|---|
| A级 | 0.25% | 0.27-0.93% | 0.035% | 0.035% | ≥0.10% |
| B级 | 0.30% | 0.29-1.06% | 0.035% | 0.035% | ≥0.10% |
| C级 | 0.35% | 0.29-1.06% | 0.035% | 0.035% | ≥0.10% |
Yield strength: Grade A ≥ 205 MPa, Grade B ≥ 240 MPa, Grade C ≥ 275 MPa
Elongation: According to the wall thickness and diameter, it is required to be between 22-35%