GB/T3639 Cold Drawn / Cold Rolled Precision Seamless Steel Tubes For Precision Application
GB/T3639 Cold Drawn Or Cold Rolled Precision Seamless Steel Tubes For Precision Application
Material
| Material Type | Description |
|---|---|
| Steel | Carbon Steel, Alloy Steel, Stainless Steel |
Specification
| Specification | Details |
|---|---|
| Standard | GB/T3639 |
| Outer Diameter | 6-168mm |
| Wall Thickness | 0.5-15mm |
| Length | 5.8m, 6m, 11.8m, or customized |
Chemical Composition
The chemical composition of GB/T3639 precision seamless steel tubes may vary depending on the specific steel grade. Below is a general overview:
| Element | Carbon Steel (% weight) | Alloy Steel (% weight) | Stainless Steel (% weight) |
|---|---|---|---|
| Carbon (C) | 0.08-0.20 | 0.10-0.20 | 0.08 max |
| Silicon (Si) | 0.17-0.37 | 0.17-0.37 | 0.75 max |
| Manganese (Mn) | 0.35-0.65 | 0.40-0.70 | 2.00 max |
| Phosphorus (P) | 0.035 max | 0.035 max | 0.045 max |
| Sulfur (S) | 0.035 max | 0.035 max | 0.030 max |
Note: The above values are indicative and may vary based on the specific steel grade.
Mechanical Properties
The mechanical properties of GB/T3639 precision seamless steel tubes are determined by the specific steel grade and the manufacturing process. The following table provides general mechanical properties:
| Property | Carbon Steel | Alloy Steel | Stainless Steel |
|---|---|---|---|
| Tensile Strength | 540-720 MPa | 590-835 MPa | 520-720 MPa |
| Yield Strength | 390-590 MPa | 390-590 MPa | 205-520 MPa |
| Elongation | 10%-20% | 10%-20% | 35% min |
| Hardness | 170-210 HV | 170-210 HV | HRB 80 max / HV 180 max |
Note: The mechanical properties mentioned above are typical values and may vary depending on the steel grade and specific product.
Steel Grade
GB/T3639 precision seamless steel tubes are available in various steel grades, including but not limited to:
- 10
- 20
- 35
- 45
- Q345B
- 25Mn
- 27SiMn
- 20CrMo
- 35CrMo
- 42CrMo
Application
GB/T3639 cold drawn or cold rolled precision seamless steel tubes are widely used in various precision engineering applications. Some common areas of application include:
- Automotive industry (precision parts, shock absorber tubes, steering systems)
- Machinery and equipment manufacturing (precision machinery components, hydraulic cylinders)
- Bicycle and motorcycle manufacturing (fork tubes, frame tubes)
- Precision instruments (optical equipment, measuring devices)
- Construction and infrastructure (structural components, scaffolding)
Haiyan Sanxin Steel Pipe Factory is a leading manufacturer of steel pipes in China. Located in a region with excellent geographical advantages, the factory is situated close to the Zhoushan Port and Ningbo Port.
Our factory covers an area of more than 25,000 square meters and has been in the steel pipe manufacturing business for 20 years. Over this period, we have accumulated a wealth of professional experience, which has helped us establish ourselves as a trusted name in the industry.
At our factory, we specialize in the production of various types of steel pipes, including stainless steel pipe, carbon steel pipe, copper pipe, steel pipe,seamless steel pipe and welded pipe. Our expertise in this field is evident from the 12 patents that we hold, which demonstrate our commitment to innovation and excellence.
Q: Are you trading company or manufacturer ?
A: manufacturer,also can do trading.
Q: How long is your delivery time?
A: Generally speaking,it is 10-15 days if the goods are in stock,or it is 30-40 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples? is it free or extra ?
A: Yes, we could offer the sample for free charge but need pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=2000USD, 100% in advance. Payment>=2000USD, 30% T/T in advance ,balance before shippment.
If you have another question, pls feel free to contact with me.
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