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.