What is A252 GR2 equivalent to?
1. Standards and Grade Definitions
ASTM A252 is a U.S. material standard for welded and seamless Steel Pipe Piles used primarily in deep foundation engineering support structures such as buildings and bridges.
GR.2 (Grade 2) denotes the second grade of the standard, with a minimum yield strength of 345 MPa (50 ksi) for moderate loading scenarios. 2.
2. Domestic Approximate Equivalent Materials
According to the mechanical properties and application scenarios of ASTM A252 GR.2, it is closer to the following domestic materials:
Q345B (GB/T 1591):
Yield strength ≥345 MPa, consistent with ASTM A252 GR.2.
Widely used in construction, bridges and other structural steel fields, suitable for medium strength requirements of pipe piles.
L360 (GB/T 9711):
Steel for oil and gas transmission pipe, yield strength ≥ 360 MPa, slightly higher than GR.2, but the chemical composition and mechanical properties are close.
3. Core differences and selection recommendations
| comparison term | ASTM A252 GR.2 | Similar materials in China(Q345B/L360) |
|---|---|---|
| standard | Specialised structural steel for tubular piles | General-purpose structural steel or steel for pipelines |
| application | Bridge piling, building foundation support | Building frames, oil and gas pipelines |
| Processing | LSAW or Spiral Welded Pipe Piles | Welded or seamless steel tubes |
| chemical composition | Low carbon with manganese(like Q345B) | Q345B contect C≤0.20%,Mn≤1.70% |
Selection recommendations:
For a fully equivalent replacement, yield strength ≥ 345 MPa is preferred, as well as for piling applications. It is recommended that the material be adjusted to the actual conditions (e.g. corrosive environment, type of load).
Q345B can be used as a general alternative when there is no strict standard restriction; L360 can be used for oil and gas transport and its welding performance can be verified.
4. International standards cross-references
EN 10219 (European Standard): S355J2H (yield strength 355 MPa), slightly higher than GR.2, applicable to similar scenarios.
JIS G3444 (Japanese standard): STK490 (yield strength ≥ 325 MPa), slightly lower than GR.2, should be chosen with caution.
