We are professional manufacturer of cold drawn seamless steel pipe in China. Our seamless steel pipe with very high precision of size
Standard: GB/T8162, GB/T8163, GB/T3639, DIN2391-2
Steel material: 20#(AISI 1020/DIN1.0402 C22), 45#(ASTM 1045,DIN45), 20Cr, Q345B, etc
Technique: Cold rolling
OD: 21mm~416mm
Wall thickness: 0.8mm~20mm
Toleraance of size: ±0.1mm(outer diameter).
Usage: widely used for mechanical processing, Automobile industry, hydraulic equipments
Advantages of our high precision seamless steel pipe:
1. Smaller caliber
2. Accept small qty order
3. Good surface treatment
4. The pipe with superior performance, suitable for mechanical making
Chemical Composition of seamless steel pipe
Mechanical Properties of seamless steel pipe
Standard: GB/T8162, GB/T8163, GB/T3639, DIN2391-2
Steel material: 20#(AISI 1020/DIN1.0402 C22), 45#(ASTM 1045,DIN45), 20Cr, Q345B, etc
Technique: Cold rolling
OD: 21mm~416mm
Wall thickness: 0.8mm~20mm
Toleraance of size: ±0.1mm(outer diameter).
Usage: widely used for mechanical processing, Automobile industry, hydraulic equipments
Advantages of our high precision seamless steel pipe:
1. Smaller caliber
2. Accept small qty order
3. Good surface treatment
4. The pipe with superior performance, suitable for mechanical making
| OD | Standard tolerance | Special tolerance | |||
| Outer Diameter | GB/T3639 | DIN2391 | EN10305 | O D | thickness |
| 4mm-20mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.05mm | ±0.05mm |
| 20mm-30mm | ±0.10 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm | ±0.08 mm |
| 31mm-40mm | ±0.15 mm | ±0.15 mm | ±0.15 mm | ±0.10 mm | ±0.08 mm |
| 41mm-60mm | ±0.20 mm | ±0.20 mm | ±0.20 mm | ±0.15 mm | ±0.15 mm |
| 61mm-80mm | ±0.30 mm | ±0.30 mm | ±0.30 mm | ±0.20 mm | ±0.20 mm |
| 81mm-120mm | ±0.45 mm | ±0.40 mm | ±0.40 mm | ±0.30 mm | ±0.30 mm |
Chemical Composition of seamless steel pipe
| Material | Chemical composition (%) | ||||||
| C | Mn | P | S | Si | Ni | Cu | |
| 20# AISI 1020 | 0.17~0.23 | 0.35~0.65 | ≤0.035 | ≤0.035 | 0.17~0.37 | ≤0.3 | ≤0.25 |
| 45# ASTM1045, DIN45 | 0.42~0.5 | 0.5~0.8 | ≤0.04 | ≤0.045 | 0.17~0.37 | ≤0.25 | ≤0.25 |
| Steel material | Tensile Strength Mpa | Yield strength Mpa | Elongation % | Hardness | Straightness |
| 20# | ≥510 | ≥245 | ≥25 | ≤156HB | 0.3~1.0 |
| 45# | ≥647 | ≥355 | ≥16 | ≤HRC62 | 0.3~1.0 |