Classified by chemical composition
Can be divided into carbon steel, low alloy steel
Classified by major quality level
1 Ordinary carbon steel,
2 ordinary low alloy steel,
3 Ordinary alloy steel,
According to the national standard “Steel Product Brand Representation Method”, China’s steel product grades use the combination of Chinese Pinyin letters, chemical symbols and Arabic numerals, namely:
l) The chemical elements in the grades are represented by international chemical elements.
2) The product name, purpose, characteristics and process methods are usually indicated by the abbreviated letters of the Hanyu Pinyin representing the Chinese characters of the product.
3) The content of major chemical elements (%) in steel products is expressed in Arabic numerals.
The alloy structural steel grades are prepared according to the following rules. The numbers represent the average of the carbon content. Alloy structural steel and spring steel use two digits to represent the average carbon content, and the carbon content of stainless acid and steel and heat resistant steel is expressed in thousands. The average carbon content is <0.1% (expressed as “0”; when the average carbon content is 1.00%, the carbon content is not calibrated, otherwise it is expressed in thousands. High-speed tool steel and ball bearing steel are not marked with carbon, ball bearing steel Mark the use symbol “C”. If the average alloy content is <1.5%, only the element symbol is marked in the grade, not the content.