Oil pump barrel with cold drawn precision steel pipe
material: st45(20＃) ck45(45＃)
hardness: st45 HB:165-200 ck45 HB:207-240
length: ≤11m
inner hole roughness: Ra≤1.6um
| Hardness | Nominal diameter | Outer diameter(mm) | inner diameter(mm) | Inside diameter deviation | Inner hole roundness | |
| Chrome plated | 28 | 41.28 | 28.58 | long≤80m | length≥8m | |
| 32 | 44.45 47.75 | 31.75 | +0.03 -0.05 | -0.05 -0.15 | 0.03 | |
| 38 | 50.80 54.10 | 38.10 | ||||
| 44 | 57.10 60.45 | 44.45 | ||||
| 57 | 69.85 73.15 | 57.15 | ||||
| 70 | 82.55 85.85 | 69.85 | ||||
| 83 | 95.25 98.55 | 82.55 | -0.03 -0.15 | -0.15 -0.25 | 0.05 | |
| 95 | 111.25 | 95.25 | ||||
| 108 | 123.95 | 107.95 | ||||
| permeability | 32 | 44.45 | 31.75 | -0.15 -0.25 | 0.05 | |
| 38 | 50.80 | 38.10 | ||||
| 44 | 57.15 | 44.45 | ||||
| 57 | 69.85 | 57.15 | ||||
| 70 | 82.55 | 69.85 | ||||
We mainly specialized in manufacturing and marketing on steel tubes & pipes. Now we have five manufacturers with total capacity of 60,000 tonnes of Cold Drawn/Rolled Seamless, 50,000 tonnes of Electrical Resistance Welded, 30,000 tonnes of Cold Drawn Welded(DOM) and 30,000 tonnes of Cold Drawn Special Shape/Large Diameter, the first phase(10,OOO tonnes) of 30,000 tonnes high alloy project already completed. Total annual capacity of 200,000 tonnes for above five types and manufacturing base of high quality steel tubes & pipes(medium & small diameter) will be realized soon. Our tubes & pipes can be widely used in Power Plant Boiler, Heat Exchanger, Automobile Components, Mechanical Structure, Bearing Machining, Shipbuilding, Bridge Construction, Petroleum Exploration & Transportation, and some other relative fields.
Continuous improvement
The development of more than ten years, we have a set of complete, standardized quality control management system and quality program. The establishment of quality system internal audit team, through the strengthening of the usual supervision and inspection to continue to standardize the management of the company, meet the company's continuous improvement. The company has established the quality control procedures of the main production process, from the quality system and quality control to ensure the long-term stable development.
Quality assurance department detection center equipped with direct reading spectrometer (Germany), impact test machine, universal material testing machine, optical microscope, hardness tester, infrared spectroscopy steel analyzer and other modern testing equipment. The ultrasonic flaw detector has 4 eddy current flaw detector and four channels, six channels at the same time each 1.
German LOI atmosphere international first-class is tempering furnace and protective atmosphere bright normalizing furnace on heat treatment temperature precise automatic control ability, to provide a strong guarantee, laid the foundation for the build quality steel production base for the intrinsic quality .
