Changsha Xiangjia Metal Materical Co., Ltd.

High-quality steel and high-grade quality steel in GB/T699-1999 and GB/T3077-1999 standards, those with the word "A" after grades are high-grade quality steels, the steel without "A" are general high-quality steels. High-grade quality steel is superior to high-quality steel in the following: A. Reduce the range of ingredient content; B. Reduce the content of harmful elements (such as sulfur, phosphorus, copper); C. Ensure high purity (requires less non-metallic inclusions); D, to ensure high mechanical properties and process performance. 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.

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 X

  ①Delivery status Delivery status is the final plastic deformation or final heat treatment state of the delivered product. Generally,  tubes  delivered without heat treatment are called hot rolled or cold drawn (rolled) state or manufactured state; tubes delivered after heat treatment are called heat treated state, or normalized (normalized), quenched and tempered, solid solution, annealed according to the type of heat treatment. The delivery status should be indicated in the contract when place order. ②Delivery by actual weight or theoretical weight Actual weight - when delivered, the weight of the product is delivered according to the weighing (over-pound) weight; Theoretical weight - When delivered, the weight of the product is calculated according to the nominal size of the steel. The calculation formula is as follows (for those who require delivery by theoretical weight, it should be indicated in the contract): Theoretical weight per meter of steel pipe (the density of steel is 7

Galvanized Steel Pipe is indispensable to industrial transportation and construction industries, additionally, agricultural greenhouse construction is also using galvanized steel pipe for its durable property. Galvanized pipe is anti-corrosion with extended service life, which can greatly save cost and ensure use safety. There are several points for attention in the use of galvanized steel pipe. The service life of galvanized steel pipe can be up to 15-30 years because of the galvanized surface. The process of galvanized steel pipe is mainly divided into three parts: The first part is to treat the galvanized steel pipe and apply for decontamination work with acid to achieve a clean and bright surface result. The second part is to clean it with chemical solvents, and then put it into the hot dip galvanized tank for galvanized work, which is also a very important step. The third part is to coil the galvanized steel pipe and put it into storage, and when there is a need or when a merchant