JIS G3445 STKM 11 12 13 Cold finished Hydraulic cylinder tube
We offer an extensive range of seamless precision steel tubes. The seamless precision steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard DIN2391/ EN10305-1/ GB/T3639-2009.
Processing: Cold drawn or cold rolled (Burnish or other requirements can be agreed)
Length: ≤10m
Straightness:0.3~0.8mm/m
Wall Thickness tolerance: ±10%
Inner roughness: 0.8~1.6μm
Dimensional Accuracy:
1. Tolerance on Inner Diameter: H8 H9
2. Tolerance on Wall Thickness:
Diameter: >40 +/-0.2mm
Diameter: 40 <100 +/-0.3mm
Diameter >100 +/-0.5mm
3. Surface Roughness: a=0.3~0.4micron
Length: Random length4.5-6m or as per order confirmation
Mill Test Certification: En10204/3.1B
4. Delivery condition: BKS
Main products of Yantai Xinpeng Steel Pipe Co,.Ltd
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 inElevatorbuffer 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 2008; each tube of ours is strictly in quality control that can assure the product quality of Xinpeng.
Technique Parameter
Material | (OD)(mm) | (ID) (mm) | (Tolerance) | ||||
OD(mm) | ID(mm) | W.T(mm) | Ovality | Curvature | |||
20# 45# Q345D 25Mn 42CrMo 27SiMn St35 St45 St52 St52.4 STKM13CT A519 … | 40-74 | 30-65 | ±0.01 | -0.3,-0.5 | ≤0.5 | ≤0.1 | 0.3 |
74-98 | 65-85 | ±0.01 | -0.4,-0.6 | ≤0.5 | ≤0.15 | 0.3 | |
100-116 | 85-100 | ±0.02 | -0.4,-0.6 | ≤0.6 | ≤0.15 | 0.3 | |
124-134 | 110-115 | ±0.02 | -0.6-0.8 | ≤0.6 | ≤0.20 | 0.3 | |
140-158 | 120-135 | ±0.02 | -0.7,-0.9 | ≤0.8 | ≤0.20 | 0.3 | |
165-176 | 140-150 | ±0.02 | -0.7,-0.9 | ≤0.8 | ≤0.20 | 0.3 | |
188-203 | 160-180 | ±0.02 | -0.7,-0.9 | ≤0.8 | ≤0.20 | 0.3 | |
For Honed /SRB tube standard 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 |
Material Range of Yantai Xinpeng
Steel Grade | ||
DIN | 1629 | ST 37 / 44 / 52 |
1630 | ST 37.4 / 44.4 / 52.4 | |
2391-2 | ST 35 / 45 / 52 | |
EN | 17204 | C22 – Ck 22 – Cm22 – |
17210 | C15 – Ck 15 – Cm 15 – 16MnCr5 | |
10305-1 | E215/235/355/255 | |
GB | 3639 | 10#, 20#, 16Mn, 45# |
ASTM | A 519 | 1010 |
A179-A450 | A450 | |
A822-A450 | A450 | |
BS | BS 6323 | CFS3 CFS4 CFS5 CFS6 CFS7 |
NFA | 49310 | TU 37 b |
Delivery conditions:
Precision tubes are delivered in following conditions
BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after last cold forming process.
BKW (+LC) Cold finished/soft
After last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized.
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.
Tests: 100% eddy current test, chemical and mechanical inspection, size checking and others
- Product Process
- Pickling-Phosphide-Saponification
- Cold Drawn/Rolled
- Anneal-Stress relieve( BKS)
- Straightening(0.3mm/M)
- Straightness Testing
- Dimension testing
- Lathe
- Surface polishing
- SRB
- Xinpeng Workplate
11.Package
3. The packaging process and other terms
Transportation: by sea
20' FCL (means the length than 5,800mm)
40' FCL (means the length than 11,800mm)
Bulk cargo (means the quantity is more than 200MT)
With regards to other length or quantity, it should be taken by clients themselves
Delivery time: 10-30days to the dispatch port after receipt of T/T or L/C at sight
Optional: wooden box; caps; vanished coating. Clients should pay for this fee
Payment: T/T or L/C at sight, T/T 100% in advance (the order less than 30MT)
Price item: FOB, CFR, CNF, C&F, CIF
Origin: China
Third party inspection: BV, SGS, Lloyds. The Expense need to stand by clients.
Finished Products
Yan Tai Xinpeng Steel Pipe Co., Ltd. was established in December, 1992, with the registered capital of 5 million Yuan. Xinpeng Company Locatedin Yantai which is one of the beautiful coast city of China.
Our plant and office cover an area of 12,000sqm, with the total area of 20,000sqm.
Our company mainly produces various specifications of cold-drawn precision seamless steel tubes and hydraulic precision cylinders also honed tube. Sell the seamless tube also the cold drawn welded tube (Dom tube_ from Italy Marcegalia.
Our products are widely used in such industries as:
hydro-cylinders, automobiles, engineering machinery, textile machinery, printing machinery, oil drilling, etc.
Welcome to inquiry at any time, we will try our best!