1. Definition of ASTM A283 Grade D welded pipe
ASTM A283 Grade D welded pipe is a carbon structural steel welded steel pipe that complies with the American ASTM A283/A283M standard. It is mainly used for low-pressure static structural parts (such as storage tanks and general pressure-bearing equipment). Its core characteristics include:
The lower limit of yield strength is 230MPa, which belongs to medium-low strength steel.
The material is low carbon steel, emphasizing weldability and surface quality, and is suitable for the manufacture of welded pipes delivered in hot-rolled state.
This welded pipe belongs to the D grade (Gr.D) of the ASTM A283 standard, which is different from the B and C grades and is often used in non-dynamic load scenarios.
2. Comparison of Equivalent Materials
| Standard | Grade | Reasons |
|---|---|---|
| GB | Q235B/Q235D | Yield strength ≥ 235MPa, close to the 230MPa requirement of ASTM A283 D grade, and all are carbon structural steel, suitable for welding pipe fittings manufacturing |
| JIS | SS400(JIS) | The tensile strength overlaps with A283 D grade (400MPa grade), but the suitability for specific working conditions needs to be verified. |
Equivalent Notes
Differences between Q235B and Q235D:
The sulfur content of Q235B (≤0.045%) is slightly higher than that of A283 D grade (the standard is not clear but tends to be low sulfur), and Q235D is preferred to improve purity.
Q235D has better low-temperature impact toughness and is more suitable for harsh environment replacement.
Application Limitations:
ASTM A283 D grade welded pipes are not suitable for dynamic loads or high strength requirements, and equivalent materials need to simultaneously verify static pressure bearing capacity.
When domestic substitution, it is necessary to ensure that the welded pipes comply with the GB/T 3091 standard to match the manufacturing requirements of ASTM A283.
