Delivery length is also called the length required by the user or the length of the contract. The standard has the following provisions on the delivery length: A. Normal length (also called non-fixed length): Any length within the length range specified by the standard and no fixed length requirement is called normal length. For example, the structural pipe standard stipulates: hot-rolled (extruded, expanded) steel pipe 3000mm ~ 12000mm; cold drawn (rolled) steel pipe 2000mm ~ 10500mm. B. Fixed-length length: The fixed-length 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 fixed-length length in actual operation, so the standard specifies the allowable positive deviation value for the fixed-length length. The standard for structural pipes is: The yield rate of the production of fixed-length pipes is larger than that of the usual length pipes, and it is reasonable for the manufacturer to raise the price. The rate of price increase varies from company to company. Generally, the price increase is about 10% on the base price. C. Length of multiple ruler: The length of the multiple ruler should be within the range of normal length. The contract should indicate the length of the single ruler and the multiples of the total length (for example, 3000mm×3, which is 3 multiples of 3000mm, and the total length is 9000mm). In actual operation, the allowable positive deviation of 20mm should be added to the total length, plus the allowance for the incision of each single ruler length. Take the structural pipe as an example, the allowance for cutting is stipulated: 5-10mm for outer diameter ≤159mm; 10-15mm for outer diameter >159mm. If there is no double-length deviation and cutting allowance in the standard, it should be negotiated by the supplier and the buyer and indicated in the contract. The double-length scale is the same as the fixed-length length, which will bring about a significant reduction in the yield rate of Heilongjiang stainless steel manufacturers. Therefore, it is reasonable for the manufacturer to raise the price, and the increase is basically the same as the fixed-length length. D. Range length: The range length is within the usual length range. When the user requires a fixed range length, it must be indicated in the contract. For example: Heilongjiang stainless steel pipes usually have a length of 3000-12000mm, and the range of fixed-length lengths is 6000-8000mm or 8000-10000mm. It can be seen that the range length is looser than the fixed-length and double-length length, but it is much stricter than the usual length, which will also reduce the yield of production enterprises. Therefore, it is reasonable for the manufacturer to raise the price, and the price increase is generally about 4% above the base price.