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Introduction to the length of seamless pipes

Definition and characteristics of seamless pipe

1. Definition of seamless pipe
Seamless pipe refers to a long strip of steel with a hollow section and no joints around it.

2. Features of seamless pipe
First, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the higher the processing cost; secondly, the technology of the product determines its limited performance, generally The precision of seamless steel pipe is low: uneven wall thickness, low brightness inside and outside the pipe, high cost of sizing, and there are pits and black spots on the inside and outside that are not easy to remove; third, its detection and shaping must be processed offline. Therefore, it reflects its superiority in terms of high pressure, high strength, and mechanical structural materials.

Length of seamless pipe

1. The usual length of seamless steel pipes (also known as non-fixed-length lengths): any length within the length range specified by the standard and no fixed length requirement is called the usual length; for example, the structural pipe standard stipulates: rolling (extrusion, Expanded) steel pipe 3000mm ~ 12000mm; cold drawn (rolled) steel pipe 2000mm ~ 10500mm.

2. Fixed-length length of seamless steel pipe: The fixed-length length should be within the usual length range, which is a certain fixed length size required in the contract. However, it is impossible to cut out the absolute fixed length in actual operation, so the standard stipulates the allowable positive deviation value for the fixed length.

3. Double ruler length of seamless steel pipe: the multiple ruler length should be within the usual range, and the single ruler length and the multiple of the total length should be indicated in the contract (for example, 3000mm×3, that is, 3 multiples of 3000mm, the total length is 9000mm) . In actual operation, the allowable positive deviation of 20mm should be added on the basis of the total length, and the incision allowance should be reserved for each single ruler length.

4. GB/T 8163-2008 Provisions for seamless steel pipes for conveying fluids:
① Steel pipes are divided into two types: hot-rolled and cold-drawn. Its specifications should comply with the provisions of GB/T 17395.
②The usual length of steel pipe is specified as follows:
Hot rolled steel pipe 3000~12000mm & cold drawn steel pipe 3000~10500mm.

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