Q235B SSAW Welded Carbon Steel Pipe description
Q235B spiral pipe is a spiral seam steel pipe made from strip steel coils as raw material, using a room temperature extrusion forming process and automatic double-wire double-sided submerged arc welding. Its production process includes strip pretreatment, single/double-wire submerged arc welding, weld gap control, and other steps, and employs continuous ultrasonic testing and hydrostatic pressure testing for quality inspection. Raw materials undergo rigorous physical and chemical testing before input, and the steel plate exhibits uniform deformation and low residual stress during the forming process, supporting the production of high-grade thick-walled pipes.
Chemical Composition Table (Melting Analysis, %)
| Element | Standard Requirement (GB/T 700-2006) | Typical Value (Reference) |
|---|---|---|
| Carbon (C) | ≤ 0.20% | 0.12~0.18% |
| Silicon (Si) | ≤ 0.35% | 0.10~0.25% |
| Manganese (Mn) | ≤ 1.40% | 0.30~0.70% |
| Phosphorus (P) | ≤ 0.045% | ≤0.035% |
| Sulfur (S) | ≤ 0.045% | ≤0.030% |
| Trace Elements | Cr/Ni/Cu ≤ 0.30% (each) | - |
Welded Pipe Performance (Per GB/T 3091-2015)
| Property | Requirement (DN≤100mm) | Test Method |
|---|---|---|
| Tensile Strength (Rm) | ≥ 375 MPa | GB/T 228.1 |
| Yield Strength (ReL) | ≥ 235 MPa | GB/T 228.1 |
| Flattening Test | H=2/3×OD, no cracking | GB/T 246 |
| Bend Test | 180° bend, no crack (DN≤50mm) | GB/T 244 |
| Hydrostatic Test | 2.5~5.0 MPa, 5s hold, no leak | GB/T 241 |
| Zinc Coating Mass | ≥500g/m² (galvanized pipes) | GB/T 3091 |
Application Areas
Construction: Used in building structures such as columns, beams, and floor slabs; also for erecting temporary structures such as scaffolding and formwork supports. In bridge engineering, it can be used for bridge support structures, piers, abutments, etc., and can also be used to manufacture bridge crash barriers, sound barriers, and other ancillary facilities.
Test and inspection
Packaging and shipping
