The "batch" in the batch standard refers to an inspection unit: inspection batch. If the batch is grouped by delivery unit, it is called delivery batch. When the delivery batch is large, a delivery batch can be divided into several inspection batches; when the delivery batch is small, an inspection batch can be divided into several delivery batches.

The composition of "batch" has the following provisions:

A. Each batch should be composed of steel pipes of the same grade (steel grade), the same heat (tank) number or the same mother heat number, the same specification and the same heat treatment system (heat).

B. For high-quality carbon steel structural pipes and fluid pipes, it can be composed of steel pipes of the same grade, the same specification and the same heat treatment system (heats) from different furnaces (tanks).

C. Each batch of welded steel pipes should be composed of steel pipes of the same grade (steel grade) and of the same specification.

Changsha Xiangjia Metal Materical Co., Ltd. specializing in the production and sales of carbon steel pipes, alloy pipes, stainless steel pipes, etc., welcome to call us for consultation.