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Help CenterCold Drawn Seamless Mechanical Tube H8 H9 Tolerance
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Product: cold drawn seamless mechanical tube H8 H9 tolerance
Technical specification: Suitable for hydraulic cylinder tube
Grade:20# 45# Q345 25Mn 27SiMn
Tensile strengh: ≥ 600N/mm2
Outer diameter: 30-250mm
Wall thickness: 2-30mm
ID Tolerance: H8 H9 or as customized
Package: standard packing with plastic bags or as client's request
Delivery time: within 20-30 days after receiving downpayment or as client's request
Trade terms: FOB Yantai, Qingdao or as client's request
Company
Located in the beautiful coastal city-Yantai, our company mainly produces various specifications of precision hydraulic steel tube, which are widely used in hydraulic and Pneumatic cylinder for automobile, engineering machinery, textile machinery, printing machinery, oil drilling and other field.
Product
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 Elevatorbuffer 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.
The difference between precision steel pipe and seamless pipe?
1. the seamless steel tube with obvioue difference is that dimensional accuracy, can be up to 0.1mm.
2. high precision steel pipe diameter surface finish, the customer without processing can be used directly and ordinary seamless steel tube to the customer and lather, polishing processing.
3.Superior surface finish
4.Dimensional accuracy and excellent micro-structure uniformity
Process
Equipped with JLB250T hydraulic cold drawn set, LD120 cold rolling set, annealing furnace, strong honed machine, polising machine,lathe,saws CNC skived and roller burnished machine, kinds of testing machine.
Technique and tolerance
Working Method |
Range |
Size of ID |
Tolerance |
|||||
ID tolerance |
WT(mm) |
Ovality |
Curvature |
|||||
H8 |
H9 |
H10 |
||||||
Cold Drawn |
25-250 |
>30-50 |
+0.0390 |
+0.0620 |
+0.1000 |
±5% to 7.5% ID>210mm ±10% |
≤0.10-0.20 |
0.3 |
Cold rolling |
25-150 |
>50-80 |
+0.0460 |
+0.0740 |
+0.1200 |
|||
Cold drawn-hone |
40-250 |
>80-120 |
+0.0540 |
+0.0870 |
+0.1400 |
|||
Cold drawn-SRB |
50-250 |
>120-180 |
+0.0630 |
+0.1000 |
+0.160 |
|||
Cold drawn-polish |
40-250 |
>180-250 |
+0.0720 |
+0.1150 |
+0.1850 |
|||
Cold drawn-polish-SRB |
50-250 |
Other size and technique parameter upon request |
||||||
Mechanical Property
Delivery Condition |
Cold drawn+stress-relieved(BK+S)(SR) |
Cold finished(hard)(BK) |
|||
Steel Grade |
Tensile strength (Rm Mpa)
|
Yield strength (ReH Mpa)
|
Elongation A5% |
Tensile strength (Rm Mpa)
|
Elogation A5%
|
20# |
≥520 |
≥375 |
≥15 |
≥550 |
≥8 |
45# |
≥600 |
≥520 |
≥10 |
≥640 |
≥5 |
16Mn(Q345B Q345D) |
≥600 |
≥520 |
≥14 |
≥640 |
≥5 |
25Mn |
≥600 |
≥510 |
≥15 |
≥640 |
≥5 |
27SiMn |
≥760 |
≥610 |
≥10 |
≥800 |
≥5 |
St45 |
≥520 |
≥375 |
≥15 |
≥550 |
≥5 |
E355(St52) |
≥600 |
≥520 |
≥14 |
≥640 |
≥5 |
SAE1026 |
≥600 |
≥510 |
≥15 |
≥640 |
≥5 |
Delivery condition
1. NBK(+N)
after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium
2. GBK(+A)
after cold forming, annealing in non oxidizing medium protective gas
3. BK(+C)
the final heat treatment after cold forming, therefore small steel pipe plastically, the plastically degree does not guarantee
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. 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
Our service
1. Cargo track service during transporting and feedback service after cargo is loaded on board
2. Flexible terms of payment by T/T , L/C And so on.
3. Big discount for repeat customers
4. Smooth delivering procedure
5. More than 20 years steel trading experience
6.Alibaba trade assurance supplier
Our customer
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