1.Seamless steel tube and carbon tube
Widely used in oil,drilling, gas, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT ST52 CK45 and AISI 1020. We can also offer as customized seamless steel tube.
2.precision steel tubes
cold drawn steel tube/cold rolled steel pipe
Grade: 20#45#16Mn25Mn Q345 27SiMnE355ST52 STKM13A STKM13C
Standard: GB/T8713GB/T3639DIN2391EN10305ASTMA519
Range: 30-300mm
Length: 11m(max)
The cold process can remove the oxide layer outside to improve surface and offer better mechanical property, also can change ID,OD,WT to meet every client request.
3. Honed steel tube&SRB steel pipe
ID Tolerance: H8H9 or as client's request
ID Roughness: RA0.4micron(max)
Length: 6m(max)
Inner roughness: Ra0.2-0.8um
Straightness: 1:1000 or customized
This process can improve the roughness of the inner tube to 0.2-0.8um and make tube for cylinder using directly.
4.Hydraulic cylinder steel tube
precision steel tube technique and tolerance
Working method | Range | ID size | Tolerance | ||||||
ID Tolerance | WT | Ovality | Curvature | ||||||
H8 | H9 | H10 | |||||||
cold drawn | 25-250 | >30-50 | +0.039 0 | +0.062 0 | +0.100 0 |
±5% to 7.5% ID>210mm ±10% |
≤0.10-0.20 |
0.3 | |
cold rolling | 25-150 | >50-80 | +0.046 0 | +0.074 0 | +0.120 0 | ||||
cold-drawn-honed | 40-250 | >80-120 | +0.054 0 | +0.087 0 | +0.10 0 | ||||
cold drawn-SRB | 50-250 | >120-180 | +0.063 0 | +0.100 0 | +0.160 | ||||
cold drawn-polish | 40-250 | >180-250 | +0.072 0 | +0.115 0 | +0.185 0 | ||||
polish-SRB | 50-250 | other size and technique parameter upon request | |||||||
Cold Drawn Carbon Seamless Steel Pipe
ID tolerance:
ID size | ID deviation (mm) | |||
H7 | H8 | H9 | H10 | |
30 | +0.021 0 | +0.033 0 | +0.052 0 | +0.084 0 |
>30~50 | +0.025 0 | +0.039 0 | +0.062 0 | +0.100 0 |
>50~80 | +0.030 0 | +0.046 0 | +0.074 0 | +0.120 0 |
>80~120 | +0.035 0 | +0.054 0 | +0.087 0 | +0.140 0 |
>120~180 | +0.040 0
| +0.063 0 | +0.100 0 | +0.160 0 |
>180~250 | +0.046 0 | +0.072 0 | +0.115 0 | +0.185 0 |
>250~315 | +0.052 0 | +0.081 0 | +0.130 0 | +0.210 0 |
>315~400 | +0.0527 0 | +0.089 0 | +0.140 0 | +0.230 0 |
Delivery Condition
1. BK(+C)
the final heat treatment after cold forming, threfore small steel pipe plasticly, the plasticly degree does not guarantee
2. BKS(+SR)
have a stress relief after cold forming, heat treatment, steel pipe can be carried out within a certain limit in the appropriate processing again
3. NBK(+N)
after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium
4. BKW(+LC)
after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)
5. GBK(+A)
after cold forming, annealing in non oxidizing medium protective gas
packaging details: brand parcel bundle with steel strips wooden box as clients request
delivery details:15 days after 30% T/T payment in advance 
Yantai Xinpeng Steel Pipe Co,.Ltd. is one of the best suppliers of the precision tube and hydraulic cylinder tube in North of China. Since 2002 cold drawn machine set importing, Xinpeng become a big precision steel pipe manufacture with 500Mt month productivity in the next 12 years.
Products widely used in the hydraulic cylinder of the heavy machinery, Cranes, excavator, forklifts and the Petrol industry.
1. Hydraulic Cylinder Tube------Main products of Xinpeng,
Used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT ST52 CK45 and 1020. We can work and get the mechanical property of the clients need and extended the life of the hydraulic cylinder.
2.SRB tube ----- used in Elevator buffer and Hydraulic Cylinder .
This kind tube have a better roughness inner the tube, ra0.2-0.4um and can use directly in the hydraulic cylinder tube. Range: ID 50-250mm and Length can work at most 6M.
3. Cold finished tube---- Widely Used.
Processing range 30-300mm, biggest length is 11M.
Xinpeng Have passed ISo9001 verified from 2015; each tube of ours is strictly in quality control that can assure the product quality of Xinpeng.
1.Hydraulic Cylinder Tube---Used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT, ST52, CK45 and 1020. We can work and get the mechanical property of the clients need and extended the life of the hydraulic cylinder.
2.SRB tube ----- Used in Elevator,buffer and Hydraulic Cylinder .This kind tube have a better roughness inner the tube, ra0.2-0.4um and can use directly in the hydraulic cylinder tube.
Range: ID 50-250mm and Length can work at most 6M.
3.Cold finished tube---- Widely Used. Processing range 30-300mm, biggest length is 11m
1. Free sample is available
2. Small quantity order is acceptable
3. Quality control is strict
4. Third party inspection is acceptable
5. 12 months quality guarantee
6. Payment term is negotiable