Seamless pipe delivery length range standard

In the process of purchasing seamless pipes (SMLS), we often encounter several terms for the length of steel pipes. If we cannot fully understand these terms, hidden dangers will often be buried in the signing of the contract, which will bring inconvenience or major losses to our later use. Therefore, we should fully understand these terms in the procurement process and confirm the reasonable length of the seamless steel pipe we need.

What is the delivery length?

The delivery length is also called the user's required length or the contract length.

The standard has the following regulations on the delivery length:

①Usual length (also known as non-fixed length): Any length within the length range specified by the standard and without fixed length requirements is called ordinary length. For example, the structural pipe standard stipulates: hot-rolled (extrusion, expansion) steel pipe 3000mm~12000mm; cold drawn (rolled) steel pipe 2000mm~10500mm.

② Length to length: The length to length should be within the usual length range, which is a certain fixed length dimension required in the contract. However, it is impossible to cut out the absolute cut-to-length length in actual operation, so the standard stipulates the allowable positive deviation value for the cut-to-length length. Since the production rate of seamless steel pipes with fixed lengths is much lower than that of the usual lengths, it is reasonable for manufacturers to ask for price increases.

③Double ruler length: The double ruler length should be within the usual length range, and the single ruler length and the multiple of the total length should be specified in the contract (for example, 3000mmx3, which is 3 times of 3000mm, the total length is 9000mm). In actual operation, an allowable positive deviation of 20mm should be added to the total length, plus a margin of notch should be left for each single ruler length. Taking the structural pipe as an example, it is stipulated that the incision margin is 5-10mm for the outer diameter ≤ 159mm; 10-15mm for the outer diameter > 159mm.

If there are no regulations on the length deviation and cutting allowance in the standard, it should be negotiated between the supplier and the buyer and indicated in the contract. The double-length length is the same as the fixed-length length, and it will also bring a significant reduction in the yield of the production enterprise, and its price increase is basically the same as that of the fixed-length length.

④ Range length: The range length is within the usual length range. When the user requires one of the fixed range lengths, it must be specified in the contract.
For example: the usual length is 3000~12000mm, while the range length is 6000~8000mm or 8000-10000mm.

Although the range length is looser than the fixed-length and double-length length requirements, it is much stricter than the usual length, which will also bring a reduction in the yield of seamless steel pipes to production enterprises.

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