What are the grades of low alloy steel classified according to?
1. Indicated by steel properties
The method of expressing the grades of low alloy steel and high strength structural steel is the same as that of carbon structural steel. The representation method has three components: the pinyin letter Q representing the yield point, the yield point value (in MPa), the quality grade of the steel, the deoxidation method and other symbols are used to form a grade in order.
2. Indicated by steel composition and use
As needed, the grade of low alloy structural steel can be expressed: The first two digits represent the average carbon content in the low alloy cast steel. The element symbol represents the alloying elements contained in the low alloy cast steel. The number after the element symbol represents the The percentage of the average content of alloying elements.
If the average content is <1.5%, no number will be marked after the element symbol;
If the average content is 1.5%~2.49%, mark 2 after the corresponding alloy element symbol;
If the average content is 2.5%~3.49%, mark 3 after the corresponding alloy element symbol.
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