Precise Seamless steel pipe by cold drawn/cold rolling
OD: 8mm~140mm
Wall thickness: 0.8mm~20mm
Tolerance: +/-0.1mm
Technique: Cold drawing/Cold rolling
Standard: ASME SA192/SA179, GB/T8162, GB/T8163, GB/T3639, DIN2391-2
Steel material: 20#(AISI 1020/DIN1.0402 C22), 45#(ASTM 1045,DIN45), 20Cr, 40Cr, ST52, ST45, ST37.4, Q345B, etc
Delivery state: BK, BKW, NBK, GBK, BKS
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
Introduction of delivery state
| Designation |
Symbol |
Description |
| Cold finished (hard) |
BK |
Tubes do not undergo heat treatment following the final cold forming and,thus, have a rather high resistance to deformation |
| Cold finished (soft) |
BKW |
The final heat treatment is followed by cold drawing involving limited deformation.Appropriate further processing allows a certain degree of cold forming(e.g. bending expanding). |
| Cold finished and stress-relleved |
BKS |
Heat treatment is applled following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree |
| Annealed |
GBK |
The last cold forming process is followed by annealing in a controlled atmosphere |
| Normalized |
NBK |
The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere |
Preicision Seamless Tube Size List
| OD (mm) |
Thickness (mm) |
OD (mm) |
Thickness (mm) |
OD (mm) |
Thickness (mm) |
OD (mm) |
Thickness (mm) |
| Φ13.1 |
1.5-3 |
Φ35.5 |
1.5-7 |
Φ46.1 |
1.5-10 |
Φ93 |
1.5-15 |
| Φ19.25 |
1.5-5 |
Φ35.9 |
1.5-7 |
Φ47.8 |
1.5-10 |
Φ19-Φ121 |
1.5-15 |
| Φ22 |
1.5-5 |
Φ36.6 |
1.5-7 |
Φ49.2 |
1.5-10 |
|
|
| Φ22.2 |
1.5-5 |
Φ38 |
1.5-8 |
Φ49.5 |
1.5-10 |
|
|
| Φ25 |
1.5-6 |
Φ38.4 |
1.5-8 |
Φ52.3 |
1.5-10 |
|
|
| Φ26.3 |
1.5-6 |
Φ40 |
1.5-10 |
Φ53.8 |
1.5-10 |
|
|
| Φ27 |
1.5-6 |
Φ40.2 |
1.5-10 |
Φ57 |
1.5-10 |
|
|
| Φ28 |
1.5-6 |
Φ40.9 |
1.5-10 |
Φ59 |
1.5-10 |
|
|
| Φ30 |
1.5-6 |
Φ41.3 |
1.5-10 |
Φ60 |
1.5-11 |
|
|
| Φ30.25 |
1.5-6 |
Φ41.6 |
1.5-10 |
Φ62.5 |
1.5-11 |
|
|
| Φ30.9 |
1.5-6 |
Φ42 |
1.5-10 |
Φ74 |
1.5-11 |
|
|
| Φ31 |
1.5-7 |
Φ43 |
1.5-10 |
Φ75 |
1.5-11 |
|
|
| Φ32 |
1.5-7 |
Φ44.5 |
1.5-10 |
Φ76 |
1.5-11 |
|
|
| Φ35 |
1.5-7 |
Φ45.8 |
1.5-10 |
Φ89 |
1.5-15 |
|
|
Size tolerance
| 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 |
Mechanical Properties of seamless steel pipe
| 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 |
Our Factory has 15 production lines for full range sizes of cold drawn seamless pipes.
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