Cold Drawn Seamless Tubing
Materials: 1010, 1020, 1026, 4130, 4140, 304/304L, 316/316L. Other grades upon request
OD: 4 mm to 200 mm (Custom sizes available)
WT:0.5 mm to 20 mm
L: Up to 12 meters (standard), custom lengths on request
Dimensional Tolerance: Precision Grade: OD ±0.03mm, Wall ±5%
Commercial Grade: OD ±0.1mm, Wall ±10% ASTM A519, DIN 2391
Surface Finish Ra ≤ 0.8 µm (Precision Grade) Can be polished to Ra ≤ 0.4 µm
Cold drawn seamless tubing is are precision cold-drawn seamless tube used in mechanical structures and hydraulic equipment, requiring high dimensional accuracy and a smooth surface finish. Using precision seamless tubes in the manufacture of mechanical structures or hydraulic equipment can significantly save machining time, improve material utilization, and enhance product quality.
Technical Specifications
| Parameter | Specification | Standard / Note |
|---|---|---|
| Outer Diameter (OD) | 4 mm to 200 mm (Custom sizes available) | - |
| Wall Thickness | 0.5 mm to 20 mm | - |
| Length | Up to 12 meters (standard), custom lengths on request | - |
| Dimensional Tolerance | Precision Grade: OD ±0.03mm, Wall ±5% Commercial Grade: OD ±0.1mm, Wall ±10% |
ASTM A519, DIN 2391 |
| Surface Finish | Ra ≤ 0.8 µm (Precision Grade) | Can be polished to Ra ≤ 0.4 µm |
| Common Standards | ASTM A519, DIN 2391-1/2, EN 10305-1, GB/T 3639 | - |
| Materials | 1010, 1020, 1026, 4130, 4140, 304/304L, 316/316L | Other grades upon request |
Production Process:
Cold-drawn seamless tubes typically use hot-rolled seamless tubes as raw materials. The raw materials undergo surface treatment to remove oxide scale and other impurities. Then, the raw materials are placed in a cold-drawing machine, where the steel tube is stretched using dies to reduce its diameter and wall thickness, achieving the required dimensions and precision. During the cold-drawing process, multiple stretching and annealing treatments may be required to ensure the quality and performance of the steel tube.
Classification:
By material: Cold drawn seamless tubing can be classified into carbon steel, alloy steel, and stainless steel.
By structural precision, Cold-drawn seamless steel tubes can be classified into ordinary cold-drawn seamless steel tubes and precision cold-drawn seamless steel tubes. Ordinary cold-drawn seamless steel pipes have an outer diameter tolerance of ±0.1mm and a wall thickness tolerance of ±10%; precision cold-drawn seamless steel pipes can have an outer diameter tolerance of ±0.03mm and a wall thickness tolerance of ±5%.
Classification by shape: There are round pipes and irregularly shaped pipes, including square, rectangular, elliptical, and triangular pipes.
Applications:
Machinery Manufacturing: Commonly used in the manufacture of automotive drive shafts, shock absorbers, piston pins, hydraulic cylinders, and other mechanical components.
Fluid Transportation: Widely used in hydraulic systems, fuel lines, and high-pressure pipelines, where high-pressure, high-precision fluid transportation is required.
Precision Instruments: Can be used as measuring tubes, pressure gauge tubes, and various precision fittings to ensure the accuracy and reliability of instruments.
Medical Devices: Used in the manufacture of surgical instruments, endoscopes, syringes, and other medical devices.
Aerospace: Cold drawn seamless tubing used in the manufacture of high-strength structural components and hydraulic system pipelines for aircraft and rockets.
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