Alland - Cold-Drawn Seamless Pipe

ALLLAND Steel Pipe Factory. Our Cold-drawn Seamless Pipe is manufactured using premium hot-rolled pipe as raw material, meticulously processed through cold drawing, and then subjected to multiple inspections for dimensions, wall thickness, and surface quality. The pipes comply with multiple standards including ASTM, EN, DIN, and GB, and are available in various steel grades to meet the needs of diverse industries.

Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!

During cold drawing, the pipe undergoes dual processing through dies and mandrels, significantly improving its outer diameter, wall thickness, and straightness. This results in higher dimensional accuracy, smoother surface quality, and more uniform and stable mechanical properties.

Compared to hot-rolled seamless steel pipes, cold-drawn seamless steel pipes are better suited for applications demanding higher precision, assembly consistency, and machinability. Examples include hydraulic systems, precision mechanical components, and the automotive industry.

• High dimensional accuracy, reducing secondary processing.
• Smooth inner and outer walls, ideal for precision components and assembly applications.
• Uniform microstructure after cold working ensures high batch-to-batch consistency.
• Multiple standards and steel grades available.
• Supports third-party inspection, minimizing procurement risks.

As is well known, cold-drawn pipes undergo multiple cold drawing processes rather than a single one. Why is repeated cold drawing necessary to achieve standard wall thickness and dimensions?

First, we must understand the purpose of cold drawing: it reduces the pipe’s wall thickness and inner/outer diameters to meet specifications. A single cold drawing process with excessive dimensional reduction risks pipe breakage or surface defects; conversely, insufficient reduction lowers efficiency and increases costs. Multiple drawing passes minimize the risk of fractures and cracks.

Secondly, intermediate annealing is performed after each drawing pass. This process eliminates work hardening, restores material plasticity, and prepares the pipe for subsequent operations.

• O.D.: 6 mm – 273 mm
• W.T.: 0.8 mm – 40 mm
• Length: 6-12 m, 2–12 m (custom lengths available upon request)
• Standards: EN 10297-1 / EN 10216; DIN 2391; ASTM A106, A179, A192; GB/T 3639
• Steel Grades: E355 / E470/ ASTM A106 Gr.B/ 20#, 45#/ SAE 1026     
• OD tolerance: ±0.05 mm – ±0.1 mm     
• Process: Hot-rolled parent pipe → Pickling → Cold drawing/Cold rolling → Heat treatment → Straightening → Inspection → Cutting → Packaging
• Tube Ends& Surface Treatment: Phosphated surface/ Bright annealed/ Rust-preventive oil treatment; Plain End/ Beveled End