ALLLAND Boiler Steel Pipe Supply
Welcome to 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!
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Cold-drawn Seamless Pipe is a high-precision seamless steel pipe manufactured by further processing hot-rolled seamless steel pipes through cold drawing or cold rolling at ambient temperatures.
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.
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
Cold-drawn Seamless Pipe Manufactured by ALLLAND
Hot-rolled parent tube → Pickling → Cold drawing/Cold rolling → Heat treatment → Straightening → Inspection → Cutting → Packaging
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.
| OD (mm) | WT (mm) | Weight(kg/m) |
| 20 | 2 | 0.89 |
| 30 | 3 | 2.02 |
| 40 | 4 | 3.58 |
| 50 | 5 | 5.34 |
| 60 | 6 | 7.46 |
| 80 | 8 | 14.91 |
| 100 | 10 | 23.5 |
Supports customization according to EN/DIN/ASTM standards and customer drawings.
The core value of cold-drawn seamless pipe lies in its precise dimensions. Typically small-sized, cold-drawn pipes require tighter tolerance ranges and multiple forming processes to achieve ideal dimensional tolerances.
Outer Diameter Tolerance: ±0.05 to ±0.10 mm. For higher precision pipes, tolerances must be controlled within ±0.03 mm (depending on specifications). Smaller tolerances enhance adaptability across scenarios and broaden application possibilities.
Wall Thickness Tolerance: ±8% to ±10%. For precision pipes, tolerances are ±5% or even tighter, with uniform wall thickness being paramount.
They are particularly suitable for industries with high precision requirements, such as hydraulic systems, machinery manufacturing, and the automotive industry.
Cold-drawn pipes are more suitable for applications demanding high precision and surface quality, but hot-rolled pipes remain the primary choice for large-diameter, thick-walled applications.
Yes, we provide custom manufacturing based on drawings or technical specifications.
