Knowledge of the length and size of galvanized seamless steel pipe

1. Unfixed length (usual length)

The length of galvanized seamless steel pipe is generally different, and the length within the standard range is called unfixed length. Unfixed length is also called usual length (through length). For example, the usual length of 159*4.5 galvanized seamless steel pipe is 8~12.5

2. Fixed length

The fixed length is cut according to the order requirements. When delivering according to the fixed length, the delivered galvanized seamless steel pipe must have the length specified by the buyer in the order contract. For example, if the contract states that the delivery is in a fixed length of 6m, the delivered materials must all be 6m long, and those shorter or longer than 6m are unqualified. But in fact, it is impossible for the delivery to be 6m long, so it is stipulated that positive deviation is allowed, but negative deviation is not allowed. (When the fixed length is not more than 6m, the allowable deviation is expanded to +30mm; when the fixed length is more than 6m, the allowable deviation is expanded to +50mm)

3. Multiple length

The fixed size cut into integer multiples according to the order requirements is called multiple length. When delivering in multiple lengths, the length of the delivered galvanized seamless steel pipe must be an integer multiple of the length (called single length) specified by the purchaser in the order contract (plus saw cuts). For example, if the purchaser requires a single length of 2m in the order contract, then the length is 4m when cut into double lengths, and 6m when cut into 3 times, and one or two saw cuts are added respectively. The saw cuts are specified in the standard. When delivering in multiple lengths, only positive deviations are allowed, and negative deviations are not allowed.

4. Short length

The length is less than the lower limit of the non-fixed length specified in the standard but not less than the shortest length allowed. It is called short length. For example, the standard for fluid transport steel pipes stipulates that each batch is allowed to have 10% (calculated by number) of short-length steel pipes of 2-4m in length. 4m is the lower limit of the irregular length, and the shortest length allowed is 2m.