About Us
Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
News
In this column you can find the steel pipe related articles you need, including industry trends, product standards and materials, and some technical guidelines.
Services
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Facility
Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
Projects
Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Seamless steel pipe is a kind of steel pipe with special manufacturing process. It has smooth appearance, uniform thickness and very good internal quality. Seamless steel pipe is processed by cold drawing, hot rolling, cold heading and cold rolling of steel billet under the action of perforator and puller. Seamless steel pipe has been widely used in machinery manufacturing, automobile manufacturing, petrochemical and other fields.
Common outer diameter size of seamless steel pipe
Common outer diameter sizes of seamless steel pipe are 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 25mm, 30mm, 32mm, 35mm, 40mm, 45mm, 50mm, etc.
1. Small-diameter seamless steel pipe
The outer diameter size of small-diameter seamless steel pipe is generally between 4mm and 50mm. Common outer diameter sizes are 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. This type of pipe is mainly used in mechanical processing, bicycle manufacturing, automobile manufacturing and other fields.
2. Medium-diameter seamless steel pipe
The outer diameter of medium-diameter seamless steel pipe is generally between 50mm and 159mm. Common outer diameter sizes are 25mm, 30mm, 32mm, 35mm, 40mm, 45mm, etc. This type of pipe is mainly used in machinery, automobiles, aviation, power and other fields.
3. Large-diameter seamless steel pipe
The outer diameter of large-diameter seamless steel pipe is generally above 159mm, and common sizes are 168mm, 219mm, 273mm, 325mm, 377mm, 426mm, 508mm, etc. This type of pipe is mainly used in oil, natural gas, chemical industry, water conservancy, power and other fields for conveying high-pressure fluids or as structural support.
Seamless steel pipe outer diameter size specification table
The following table shows some commonly used seamless steel pipe models, sizes and parameters for reference only.
|
Model |
Outer diameter（mm） |
Wall thickness（mm） |
Permissible deviation（mm） |
|
10# |
6-168 |
1-20 |
±12.5% |
|
20# |
5-108 |
1-20 |
±12.5% |
|
35# |
6-108 |
1-20 |
±12.5% |
|
45# |
5-108 |
1-20 |
±12.5% |
|
16Mn |
6-108 |
1-20 |
±12.5% |
|
20Cr |
6-108 |
1-20 |
±12.5% |
|
40Cr |
5-108 |
1-20 |
±12.5% |
|
45Mn2 |
16-76 |
1-20 |
±12.5% |
|
27SiMn |
25-110 |
4-20 |
±12.5% |
|
12CrMo |
14-168 |
2-20 |
±12.5% |
|
15CrMo |
14-168 |
2-20 |
±12.5% |
In the above table, 10#, 20#, 35#, 45#, 16Mn, 20Cr, 40Cr, 45Mn2, 27SiMn, 12CrMo, 15CrMo, etc. are all common seamless steel pipe models, with outer diameters ranging from 5mm to 168mm and wall thicknesses ranging from 1mm to 20mm.
The above is a detailed display of the outer diameter size specification table of seamless steel pipes. Seamless steel pipes of different models, sizes, and specifications have differences in outer diameter dimensions, and need to be selected according to actual needs. When choosing the seamless steel pipe size, in addition to paying attention to the outer diameter size, you also need to pay attention to factors such as the wall thickness, material, and purpose of the pipe. At the same time, you also need to choose the appropriate material and specification according to the pipeline use environment and use requirements.
E-mail: sales@eastern-steels.com
