Hardness: It is a performance indicator used to measure the softness or hardness of a material. There are numerous methods for conducting hardness tests, and the principles vary as well. The hardness values obtained and their meanings are not exactly the same.

This article provides a detailed introduction to the common methods for testing the hardness of steel and their corresponding tables, including Brinell hardness (HB), Rockwell hardness (HRC), and Vickers hardness (HV), etc. Brinell hardness is suitable for softer materials, Rockwell hardness is suitable for high-hardness materials, and Vickers hardness is suitable for microscopic analysis.

This article provides a detailed analysis of the allowable error standards for the thickness of stainless steel plates, covering specific values from mainstream international (ISO), Chinese (GB), and American (ASTM) standards. It also analyzes the causes and influencing factors of the errors, and offers suggestions for material selection in practical applications, helping users reasonably control the tolerance range according to engineering requirements.

In the modern industrial system, steel strips, as a basic and key metal material, are widely used in multiple fields such as medical care, the aviation industry, automobile manufacturing, electronics and electricals, and tool cutting.

Medium and heavy plates are mainly used in construction engineering, mechanical manufacturing, container manufacturing, shipbuilding, bridge construction, etc.

Square tubes, as important profiles widely used in various fields such as construction, machinery, and furniture, are highly favored for their stable structure and strong load-bearing capacity.