What are the grades of low alloy steel classified according to?
Expressed 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.
① Yield point value: Yield point value (unit: Mpa). For example, Q390 just represents low-alloy steel and high-strength structural steel with Reh≥390MPa.
②+Quality grade: The quality grade is from A to E, the sulfur and phosphorus content decreases in sequence, and the quality increases in sequence. For example Q345C, Q345D, etc.
③+Deoxidation method: Deoxidation method symbols: F means boiling steel; b means semi-killed steel; Z means killed steel; TZ means special killed steel. Killed steel does not need to be marked with symbols, that is, both Z and TZ need not be marked. For example, Q235-AF represents Grade A boiling steel.
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