Q195 Welded Steel Pipe is a low-carbon steel pipe manufactured from Q195 grade steel strip through a high-frequency welding process. Renowned for its excellent formability, good weldability, and cost-effectiveness, it serves as a fundamental component across a wide spectrum of industrial and commercial sectors. This pipe offers a reliable balance of strength and ductility, making it an ideal choice for applications where high strength is not the primary requirement but consistent performance and economic value are paramount.

Key Features & Advantages

Superior Weldability & Formability: The low carbon content (typically max 0.12%) of Q195 steel ensures easy welding and bending without compromising the integrity of the material. This allows for effortless fabrication and installation on-site.

Excellent Surface Quality: Our Q195 pipes are produced with precise control, resulting in a smooth, uniform surface finish with minimal imperfections, which is crucial for aesthetic applications and certain mechanical uses.

Cost-Effectiveness: As an economical carbon steel grade, Q195 provides a highly competitive price-to-performance ratio, making it the preferred choice for projects with budget constraints without sacrificing essential mechanical properties.

Consistent Mechanical Properties: Manufactured under strict quality control standards, our pipes guarantee consistent yield strength, tensile strength, and elongation, ensuring reliability and predictability in your designs.

Wide Range of Sizes: Available in an extensive array of outer diameters (OD) and wall thicknesses (WT) to meet diverse project specifications.

Manufacturing Process: High-Frequency Induction Welding (HFI / ERW)

Our Q195 pipes are produced using advanced High-Frequency Induction Welding (HFI/ERW) technology. This process heats the edges of the formed steel strip to a precise temperature using high-frequency electrical current and then forges them together under pressure to create a seamless, strong, and homogeneous weld bead. This method ensures:

A clean, narrow heat-affected zone (HAZ).

High production efficiency and dimensional accuracy.

A robust weld strength often comparable to the base metal.

Technical Specifications & Standards

Material Grade: Q195 (Equivalent to: ASTM A36, S185, SS330, E195)

Standard: GB/T 3091 (Chinese National Standard for welded steel pipes for low-pressure fluid conveyance), but can be produced to other international standards upon request.

Yield Strength (σs): ≥ 195 MPa

Tensile Strength (σb): 315 - 430 MPa

Elongation (δ5): ≥ 33%

Chemical Composition (Typical):

Carbon (C): ≤ 0.12%

Manganese (Mn): ≤ 0.50%

Silicon (Si): ≤ 0.30%

Sulfur (S): ≤ 0.050%

Phosphorus (P): ≤ 0.045%

Available Sizes

Outer Diameter (OD): 1/2 inch (21.3mm) to 6 inches (165mm) and larger.

Wall Thickness (WT): 0.8mm to 4.0mm (SCH 10, SCH 40, etc.).

Length: Standard random lengths (5.8m - 6m), or cut-to-length as required.

Surface Treatment & End Finishes

Black / Bare: Plain mill finish, ready for painting or galvanizing on-site.

Galvanized (Q195 Galvanized Welded pipe): Hot-dip galvanized (HDG) or electro-galvanized (EG) to provide superior corrosion resistance for outdoor and harsh environments.

Oiled: Lightly oiled to prevent rust during storage and transportation.

Ends: Plain end, beveled end, or threaded end (as per customer request).

Primary Applications

Q195 Welded pipe is extensively used in:

Low-Pressure Fluid Systems: Water, gas, air, and heating systems.

Structural Frameworks: Guardrails, fencing, greenhouse structures, scaffolding components, and indoor furniture frames.

Automotive and Machinery: Parts for vehicles, agricultural machinery, and low-stress mechanical components.

Decoration: Handrails, furniture, and display systems, often in its galvanized form.

General Engineering: Conduits for protecting electrical wires and cables.