China Suppliers Factory Hot-Rolled Carbon Steel Coils Q195 Q235 Q345 A36 SS400 for Construction Industry

Our high-performance carbon steel pipes cover seamless and welded types, with a full range of grades including low-carbon (Q235B, A106 Gr.B, 10#) and medium-carbon (20#, 45#, A53 Gr.B) variants, tailored to industrial transport and structural needs. Seamless pipes—manufactured via hot rolling/cold drawing of solid billets—excel in high-pressure scenarios (up to 30MPa) with uniform wall thickness, while welded pipes (ERW, SAW processes) offer cost-effectiveness for large-diameter, low-to-medium pressure applications, with longitudinal/spiral welds for different load requirements.

We provide flexible specifications: outer diameters from 10mm (precision instrumentation tubes) to 1600mm (large-diameter structural pipes), wall thicknesses 1–60mm, and lengths up to 12m (or custom cut-to-length). Surface treatments include hot-dip galvanizing (for corrosion resistance in humid/outdoor environments), epoxy coating (for chemical transport), or plain mill finish. All pipes undergo strict quality control—ultrasonic flaw detection for welds, water pressure testing for leak tightness, and tensile testing—to ensure compliance with ASTM A106, GB/T 8163, API 5L, and EN 10217 standards.

With excellent weldability, high tensile strength (235–600MPa), and cost-efficiency, these pipes are foundational across sectors: oil/gas (transmission pipelines, well casings), construction (structural columns, scaffolding tubes), water treatment (sewage/desalination pipelines), machinery (hydraulic cylinders, conveyor rollers), and energy (power plant steam pipes, boiler tubes). They balance durability and affordability, suitable for both temporary infrastructure and long-term industrial systems. We offer bulk supply, fast delivery, and technical support—including custom threading/flanging—to meet global clients' diverse project demands.