Delivery length, also known as the length of the user requirements or contract length. There are several rules for the length of the delivery:

A, usually length (also known as non-length length): Where the length of the standard length of the provisions and no fixed length requirements, are called the usual length. For example, the structure of the pipe standard: hot (extrusion, expansion) steel pipe 3000mm ~ 12000mm; cold drawn (rolling) steel pipe 2000mmm ~ 10500mm.

B, length of length: length should be within the length of the length of the contract is required in a fixed length of the size. But the actual operation are cut out the absolute length of the length is not possible, so the standard length of the specified length of the allowable positive deviation. The standard of the structural pipe is that the production capacity of the length pipe is larger than that of the normal length pipe, and it is reasonable for the production enterprise to raise the price requirement. Increase the rate of the enterprise is not consistent, generally based on the base price increase of about 10%.

C, the length of the length: the length of the length should be within the normal length range, the contract should be marked with a single length and the length of the total length of the composition (for example, 3000mm 3, 3000mm 3 times the total length of 9000mm). In practice, should be based on the total length of the allowable positive deviation of 20mm, plus the length of each monogon should stay incision margin. To structural tube, for example, the provisions of the remaining incision margin: diameter ≤ 159mm for the 5 ~ 10mm; diameter> 159mm for 10 ~ 15mm. If the length of the standard without the length of the deviation and cut the provisions of the provisions of the supply and demand sides should be negotiated and specified in the contract. Times the length of the same length with the length of the production will bring a significant reduction in production rate, so the production enterprises to raise the price is reasonable, the rate of increase with the length of the increase in the length of the same.

D, the length of the range: the length of the range in the normal length range, when the user requires a fixed range of length, the need to specify in the contract. For example: usually length of 3000 ~ 12000mm, and the length of the length of 6000 ~ 8000mm or 8000 ~ 10000mm. It can be seen that the length of the length is longer than the length and length of the length requirements, but much more than the usual length, but also to the production enterprises to bring the yield reduction. So the production enterprises to raise the price is justified, the increase in the price increase in the base price of about 4%