Astm252 gra grb carbon ssaw steel pipe
- Model
- Astm252 gra grb SSAW Pipe
Item specifics
- Special Pipe
- API Pipe, Other, EMT Pipe, Thick Wall Pipe
- Section Shape
- Round
- Standard
- ASTM A252
- Technique
- SSAW
- Certificate
- API, CE, JIS, ISO9001, ISO14001, ISO45001, BV, CNAS,etc.
- Product name
- spiral welded tube pipe
- Oiled or Non-oiled
- Non-oiled
- Processing Service
- Welding, Punching, Cutting, Bending, Decoiling
- Length
- 12M, 6m, 6.4M, 1-30M
- Tolerance
- ±15%, ±5%, ±1%, ±10%
- Outer Diameter
- 219 - 3620mm
- Ends
- 1.Plain End2. Beveled3
- Material
- ASTM A252 Grade A(GR 1)Grade B(Gr B)
- Surface Treatment
- galvanized,3PE,PLE,Oiled,Painted,etc.
Review
Description
The official corresponding steel pipe product for Astm252 gra grb carbon ssaw steel pipe is ASTM A252 Grade 1 Carbon Steel SSAW Steel Pipe，ASTM A252 Grade 2 Carbon Steel SSAW Steel Pipe, Grade A and Grade B here usually correspond to Grade 1 and Grade 2, so in terms of mechanical properties, the yield strength of GrA (Gr 1) spiral steel pipe should be greater than or equal to 205MPa, and the tensile strength should be greater than or equal to 345Mpa; The yield strength of Gr B carbon steel spiral welded steel pipe should be greater than or equal to 240Mpa, and the tensile strength should be greater than or equal to 415Mpa
Mechanical Properties
| Property | Grade A（Grade 1） | Grade B（Grade 2） |
| Yield Strength | ≥205 Mpa | ≥240 Mpa |
| Tensile Strength | ≥345 Mpa | ≥415 Mpa |
| Elongation | ≥20% | ≥20% |
GRB provides higher strength for deep foundations and heavy loads. GRA is more economical under normal load conditions.
Chemical Composition(MAX)
| C | Si | Mn | P | S |
| 0.26% | 0.45% | 1.60% | 0.050% | 0.030% |
The chemical composition requirements for two grades of steel pipes are the same. These values belong to the upper limit and do not mean that every type of steel will approach the upper limit.
The actual chemical composition depends on the actual analysis results of the material at that time. As long as it does not exceed the upper limit, it is a qualified product.
Delivery Inspection Meets The Standard
In addition to meeting the mechanical properties and chemical composition requirements of the steel pipes mentioned above, the following other testing requirements must also be met.
| Test Name | Gr A(Grade 1) | Gr B(Grade 2) |
| Guided Beed Test(Weld) | non-cracking | non-cracking |
| Flattening Test | No weld crack | No weld crack |
| NDT Test | Perform 100% ultrasonic or X-ray testing along the entire length of the weld seam. Automatic ultrasonic online monitoring. | |
Hydrostatic Test | According to ASTM A252, maintain pressure for ≥ 5 seconds without leakage. Typical pressure range: 3.0 to 12.0 megapascals. | |
Size And Appearance Inspection | Outer diameter, weight, length, ellipticity, straightness, weld contour, surface defects. | |
Hardness Test(Optional) | Each batch of Charpy V-notch (optional) | |
How To Choose: Grade A(Grade 1) VS Grade B(Grade 2)
If the drawing clearly states ASTM A252 Grade B (Grade 2), it must be purchased according to Grade B (Grade 2);
If the drawing only states ASTM A252, SSAW, and does not indicate the grade, the quotation is usually based on the commonly used grade, which is Grade B (Grade 2);
Low load, long pile, and easy buckling: the design party can calculate Grade A (Grade 1) and obtain written permission before adopting it, which can save material costs;
Bridges, ports, high-rise buildings, or large-diameter pipe piles: Grade 2 (Grade B) is given priority as it provides more safety margin.
Application
Usually, these ASTM A252 GRA GrB Carbon Spiral Welded Steel Pipes are widely used in Building & Bridge,Port & Marine,Transportation,Hydraulic & Environmental,Temporary Works Waiting in the scene.
