GB/T 3639 10# Precision Seamless Steel Pipe Cold Rolled Precision Seamless Steel Tubes For Precision Application
GB/T 3639 10# 20# 35# 45# Precision Seamless Steel Pipe
Cold Rolled Precision Seamless Steel Tubes For Precision Application
Precision seamless steel pipes are essential components in various industries that require high precision and accuracy in their applications. These pipes are manufactured using a cold rolling process, ensuring excellent dimensional accuracy and surface finish. GB/T 3639 is the Chinese national standard that specifies the requirements for precision seamless steel pipes. In this article, we will explore the key features, material specifications, chemical composition, mechanical properties, steel grades, applications, and possible alternative grades of GB/T 3639 10#, 20#, 35#, and 45# precision seamless steel pipes.
Material and Specification
GB/T 3639 precision seamless steel pipes are made from carbon steel and are available in four different grades: 10#, 20#, 35#, and 45#. These pipes are produced through a cold rolling process, which involves passing the steel billet through a series of rollers at room temperature to achieve the desired dimensions and surface finish.
The standard specifies the following dimensions for GB/T 3639 precision seamless steel pipes:
- Outer diameter: 4-120mm
- Wall thickness: 0.5-10mm
- Length: 4-12m
Key Features
Precision seamless steel pipes manufactured according to GB/T 3639 exhibit several key features that make them suitable for precision applications:
- High Precision: These pipes have excellent dimensional accuracy, ensuring precise and reliable performance in various applications.
- Smooth Surface Finish: The cold rolling process provides a smooth surface finish, reducing friction and enhancing the overall performance of the pipes.
- Good Mechanical Properties: GB/T 3639 precision seamless steel pipes possess excellent mechanical properties, including high tensile strength, good toughness, and resistance to deformation.
- Wide Range of Applications: These pipes find applications in industries such as automotive, machinery, hydraulic systems, and precision instruments, where precision and reliability are crucial.
Chemical Composition
The chemical composition of GB/T 3639 precision seamless steel pipes is as follows:
| Steel Grade | Chemical Composition (%) |
|---|---|
| 10# | C: 0.07-0.14, Si: 0.17-0.37, Mn: 0.35-0.65, P: ≤0.035, S: ≤0.035 |
| 20# | C: 0.17-0.24, Si: 0.17-0.37, Mn: 0.35-0.65, P: ≤0.035, S: ≤0.035 |
| 35# | C: 0.32-0.39, Si: 0.17-0.37, Mn: 0.50-0.80, P: ≤0.035, S: ≤0.035 |
| 45# | C: 0.42-0.50, Si: 0.17-0.37, Mn: 0.50-0.80, P: ≤0.035, S: ≤0.035 |
Mechanical Properties
The mechanical properties of GB/T 3639 precision seamless steel pipes are as follows:
| Steel Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 10# | ≥335 | ≥205 | ≥24 |
| 20# | ≥410 | ≥245 | ≥20 |
| 35# | ≥510 | ≥305 | ≥17 |
| 45# | ≥590 | ≥335 | ≥14 |
Steel Grade and Application
The different steel grades of GB/T 3639 precision seamless steel pipes have specific applications based on their mechanical properties and chemical composition. Here are the steel grades and their corresponding applications:
- 10#: Suitable for general mechanical structures and engineering components.
- 20#: Used in the manufacturing of various machinery parts, such as gears, crankshafts, and connecting rods.
- 35#: Ideal for applications requiring high strength and toughness, such as hydraulic cylinders and automobile parts.
- 45#: Widely used in the manufacturing of precision instruments, machinery parts, and high-strength components.
Possible Alternative Grades
While GB/T 3639 precision seamless steel pipes are widely used, there are alternative grades available in other international standards. Some possible alternative grades include:
- ASTM A519 1010, 1020, 1035, 1045: These American standards provide similar specifications and mechanical properties to GB/T 3639 steel grades.
- DIN 2391 ST35, ST45, ST52: These German standards offer comparable precision seamless steel pipes suitable for precision applications.
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.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.