What do different steel grades represent?

The steel grade, abbreviated as steel number, is a common language for people to understand steel. The steel grade representation method in our country adopts a combination of Chinese Pinyin letters, chemical element symbols, and Arabic numerals according to national standards. Namely:

Chemical elements in steel grades are represented by international chemical symbols, such as Si, Mn, Cr, etc. Mixed rare earth elements are represented by "RE" (or "Xt").

The product name, purpose, smelting and pouring methods, etc. are generally represented by abbreviated letters in Chinese Pinyin, as shown in the table.

The main chemical element content (%) in steel is represented by Arabic numerals.

• Example:

A Q235B: Q refers to the yield strength

235 refers to 235 MPA or higher (including 345).

The suffix B has undergone a room temperature impact energy test (20. c)

C: 0 degrees, D: -20 degrees, E -40 degrees

B 45 #: High quality carbon structural steel with a carbon content of around 0.45%

C 09cupcrni-a: Now also known as Q345NQR1

09 refers to a carbon content of around 0.09%

CU, P, CR, and NI are the content elements, respectively.

Steel grade is the most important indicator of steel, and only by understanding the steel grade can suitable steel be purchased.

• Previous article：What are the grades of low-alloy wear-resistant steel?
• Next article：What is the difference between NM400, NM450, and NM500?