Specifications, models and dimensions of seamless steel pipes
Contents
- Diameter and wall thickness of seamless steel pipe
- Length of seamless steel pipe
- Bending degree of seamless steel pipe
- Quality of seamless steel pipe
- Small diameter seamless steel pipe size
- Large diameter seamless steel pipe size
In order to facilitate users in selecting and calculating seamless steel pipes, this article will introduce the seamless steel pipe specification and size comparison table in detail.
Diameter and wall thickness of seamless steel pipe
The diameter and wall thickness of seamless steel pipes are two important parameters. According to the national standard GB/T17395, the diameter of seamless steel pipes can be divided into two types: outer diameter and inner diameter.
The outer diameter refers to the diameter of the outer circle of the pipe, and the inner diameter refers to the inner diameter of the pipe. The inner diameter is the outer diameter of the seamless steel pipe minus twice the wall thickness.
Length of seamless steel pipe
The length of seamless steel pipe is generally divided into two types: fixed length and variable length. Fixed length refers to the pipe cut according to a certain length, and variable length refers to the pipe that has not been cut.
The standard length of seamless steel pipe is generally 6 meters, 9 meters, 12 meters, etc.
Bending degree of seamless steel pipe
The curvature of a seamless steel pipe refers to the radial runout of any point on its outer circumference. Generally speaking, the smaller the curvature, the better the quality of the seamless steel pipe.
According to the national standard GB/T17395, the curvature of a seamless steel pipe shall not exceed 1.0 mm/m.
Quality of seamless steel pipe
The quality of seamless steel pipes is one of the important factors to consider when selecting. Generally speaking, the better the quality of seamless steel pipes, the higher the mechanical properties such as yield strength, tensile strength, elongation, etc., and also have higher corrosion resistance and safety.
Therefore, when selecting seamless steel pipes, comprehensive considerations should be made.
Small diameter seamless steel pipe size
Small-diameter seamless steel pipe refers to seamless steel pipe with an outer diameter less than 89mm, which is widely used in mechanical structures, power equipment, auto parts and other fields. Common small-diameter seamless steel pipe diameters are:
Cold-drawn seamless steel pipe: outer diameter 6mm-89mm, wall thickness 0.5mm-15mm;
Hot-rolled seamless steel pipe: outer diameter 32mm-630mm, wall thickness 2.5mm-75mm;
Cold-rolled seamless steel pipe: outer diameter 5mm-90mm, wall thickness 0.5mm-10mm.
Large diameter seamless steel pipe size
Large-diameter seamless steel pipe refers to seamless steel pipe with an outer diameter greater than or equal to 89mm, which is usually used for equipment and pipelines in special environments such as high pressure, high temperature, and corrosion resistance. Common large-diameter seamless steel pipe diameters are:
- Hot-rolled seamless steel pipe: outer diameter is 57mm-630mm, wall thickness is 4mm-80mm;
- Cold-drawn seamless steel pipe: outer diameter is 42mm-820mm, wall thickness is 4mm-120mm;
- Forged seamless steel pipe: outer diameter is 180mm-1200mm, wall thickness is 20mm-220mm;
- Large-diameter boiler pipe: outer diameter is 33.4mm-76.2mm, wall thickness is 2.5mm-8.0mm.
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