High precision GB/T 3639 Steel cold drawn seamless tube
technique and tolerance
Working method | Range | ID size | Tolerance | |||||
ID Torlance | 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 | ||||||
chemical composition of seamless carbon steel pipe
Grade:20#45# Q345B Q345D 25Mn 27SiMn E355 SAE1026
Standard:GB/T8713 GB/T3639 DIN2391 EN10305 ASTMA519
Grade | chemical composition% | ||||
C | Si | Mn | P | S | |
20# | 0.17-0.24 | 0.17-0.37 | 0.35-0.65 | 0.035 | 0.035 |
45# | 0.42-0.50 | 0.17-0.37 | 0.50-0.80 | 0.035 | 0.035 |
SKTM13C-T(25Mn) | 0.22-0.29 | 0.17-0.37 | 0.70-1.00 | 0.035 | 0.035 |
27SiMn | 0.24-0.32 | 1.10-1.40 |
1.10-1.40 | 0.035 | 0.035 |
E355 | ≤0.22 | ≤0.55 | ≤1.6 | 0.025 | 0.025 |
Q345B | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 |
Q345D | ≤0.2 | ≤0.5 | 1.00-1.60 | 0.030 | 0.030 |
SAE1026 | 0.22-0.28 | 0.15-0.35 | 0.60-0.90 | 0.040 | 0.050 |
our tubes
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
raw material purchasing→material testing→picking→cold drawn/rolled→anneal→straightening
→straightness inspecting→dimension inspecting→sawing→UT test→lathe→surface polishing
→honed or SRB→product inspected→package
packaging details: steel strips bundle
black painting
beveled ends
wooden box
as clients request
delivery details: 15days after 30% payment in advance
1.portable hardness tester
2.wall thickness gauge
3.ultrasonic flaw detector
4.digital rockwall hardness tester
5.tensile testing machine
All our products can be produced according to your requirement strictly and guarantee the quality.
Our advantages as below:
1. Stable stock with competitive price and good quality
2. Special size is available.
3. Indoor warehouse can prevent rust
Tel +86-535-6835398
Website: www.ur-brand.net www.ur-brand.net www.ur-brand.nethttp://www.yt-xinpeng.com