The carbon steel seamless pipe is widely used in boilers, petrochemicals, hydraulic systems, structural engineering and other fields due to their excellent mechanical properties and corrosion resistance. Accurately calculating their weight is crucial for engineering design, material procurement and cost control.
Types of carbon steel seamless pipes
There are many types of carbon steel seamless pipes, mainly the following.
1. Low and medium pressure boiler tube
Used to manufacture various low and medium pressure boilers.
2. Seamless pipes for hydraulic props
Used to manufacture hydraulic props and hydraulic cylinders.
3. Pipes for petroleum cracking
Mainly used for pipes in reactors, catalysts, heat exchangers and other equipment in petrochemical plants.
4. Seamless pipes for structures
Various components, mechanical parts, hydraulic and power equipment used in general structural engineering.
5. Hydraulic seamless pipes
Hydraulic tubes used in hydraulic systems.
Weight calculation of carbon steel seamless pipe
For ordinary carbon steel seamless pipe, the following formula can be used:
Theoretical weight (kg) = (outer diameter (mm) - wall thickness (mm)) × wall thickness (mm) × 0.02466 × pipe length (m)
The coefficient 0.02466 is the carbon steel density conversion value, which is applicable to ordinary materials.
Note: This formula is only for conventional carbon steel seamless pipes, and special alloys or ultra-high pressure steel pipes need to be corrected for density coefficients separately.
Carbon steel seamless pipe specification and weight table
The following table shows the specifications and weights of commonly used carbon steel seamless pipes, for reference only.
Model |
Outer diameter (mm) |
Wall thickness (mm) |
Theoretical weight (kg/m) |
10# |
6-426 |
1-40 |
0.283-81.40 |
20# |
6-426 |
1-60 |
0.283-129.90 |
45# |
6-426 |
1-100 |
0.283-222.91 |
Q345B |
6-426 |
1-100 |
0.283-222.91 |
27SiMn |
6-426 |
1-70 |
0.283-186.21 |
16Mn |
6-426 |
1-80 |
0.283-196.82 |
Factors affecting the weight of carbon steel seamless pipes
1. Material differences
Carbon steel seamless pipes of different materials have different densities, which directly lead to changes in weight. For example, there may be differences in density between mild steel pipe and carbon steel pipe, which affects their weight.
2. Processing technology
Different processing techniques used in the manufacture of carbon steel seamless pipes will change their average wall thickness, which will affect the final weight. When seamless pipes are processed by hot rolling or cold drawing, their wall thickness and weight will be different.
3. Surface treatment
Whether the carbon steel seamless pipe is surface treated, as well as the method and degree of treatment, will affect the weight. Special surface treatment of boiler tubes will increase their surface quality, which will affect the weight.
4. Size factors
Under the same length, the larger the outer diameter and the thicker the wall thickness of the carbon steel seamless pipe, the greater its weight.
Therefore, when calculating the weight of steel pipes, it is necessary to comprehensively consider all the above factors to ensure the accuracy and practicality of the calculation results.
Summary
As a key material widely used in various industrial fields, the weight calculation of carbon steel seamless pipes is of great importance. The calculation formula and influencing factor analysis provided in this article are intended to provide practical reference and guidance for relevant practitioners.
Read more: Seamless pipe weight calculation formula