What is the limitation of delivery length in steel pipe standard

Delivery length of the steel pipe is also known as the length required by the user or the length of the contract. The standard has the following provisions on the delivery length of steel pipe:

Normal length (also known as non fixed length): where the length is within the length range specified in the standard and there is no fixed length requirement, it is called normal length. For example, the standard of structural steel pipe stipulates: hot rolled (extruded, expanded) steel pipe 3000mm - 12000mm; cold drawn (rolled) steel pipe 2000mm - 10500mm.

Fixed length: the fixed length should be within the normal length range, which is a fixed length required in the contract. However, it is impossible to cut out the absolute length in practice, so the standard stipulates the allowable positive deviation value for the steel pipe length.

In addition, there are multiple length, range length and so on.