Q215 Welded pipe is a carbon structural steel pipe known for its excellent weldability, good plasticity, and cost-effectiveness. Manufactured from Q215 grade steel strip through high-frequency electric resistance welding (ERW) or submerged arc welding (SAW) processes, this pipe offers a dependable balance of strength and versatility. It is a fundamental building block for a wide array of industrial and commercial projects where high strength is not the primary requirement, but reliability and value are paramount.

Key Features & Advantages

Excellent Weldability and Formability: The chemical composition of Q215 steel, with its moderate carbon and manganese content, makes it exceptionally easy to weld and fabricate. It can be easily cut, bent, and formed into required shapes without pre-heating under normal conditions, simplifying on-site installation and reducing labor costs.

Good Strength and Durability: Q215 grade provides a minimum yield strength of 215 MPa, offering sufficient mechanical strength for many low-to-medium pressure applications and structural supports. It delivers reliable performance and long-term durability in various environments.

Cost-Effectiveness: As a non-high-grade carbon steel, Q215 is more economical than higher-grade alternatives like Q235 or Q345. This makes it the ideal choice for projects with strict budget constraints without sacrificing essential quality and performance.

Surface Quality: Our Q215 Welded pipes are produced with stringent quality control, resulting in a smooth surface finish with minimal imperfections. This ensures a uniform appearance and provides a good base for painting or other surface treatments if required.

Variety of Sizes: Available in a comprehensive range of outer diameters (OD) and wall thicknesses (WT) to meet diverse project specifications.

Technical Specifications

Standard: GB/T 3091 (Welded steel pipes for low-pressure fluid conveyance), GB/T 13793 (Welded steel pipes for construction purposes), or as required.

Grade: Q235A, Q235B, Q215A, Q215B (Equivalent to ASTM A53 Grade A, S235JR)

Yield Strength (min): 215 MPa

Tensile Strength: 335 - 450 MPa

Elongation (min): 26% - 31% (varies based on specimen)

Chemical Composition (typical):

Carbon (C): ≤ 0.15%

Manganese (Mn): ≤ 0.60%

Silicon (Si): ≤ 0.30%

Sulfur (S): ≤ 0.050%

Phosphorus (P): ≤ 0.045%

Manufacturing Process

Our Q215 pipes are primarily manufactured using the High-Frequency Induction Welding (HFIW / ERW) process. This advanced method ensures a clean, strong, and continuous weld seam that is often nearly indistinguishable from the parent metal. The process involves:

Uncoiling and leveling the Q215 steel strip.

Forming the strip into a cylindrical shape through a series of rollers.

Welding the edges together using high-frequency electrical current.

Sizing the pipe to precise dimensional tolerances.

Cutting to specified lengths.

Subjecting finished pipes to rigorous non-destructive testing.

Applications

Q215 Welded Pipes are widely used in numerous sectors due to their adaptability and reliability:

Structural Frameworks: Scaffolding, support frames, fence posts, and architectural frameworks.

Fluid Transportation: Low-pressure water and gas conveyance systems, irrigation systems.

Automotive and Furniture: Parts for vehicles, frames for furniture, and shopping carts.

Agricultural Equipment: Structural components for greenhouses, barns, and farming machinery.

General Engineering: For machinery parts, rollers, and conveyors where high strength is not critical.

Packaging and Supply

Pipes are bundled securely with steel straps for protection during shipping and handling. We offer standard lengths of 6 meters or 12 meters, or can cut to your specified length. Both black (uncoated) and galvanized (zinc-coated) versions are available to suit different environmental conditions and application requirements.