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What are the four grades of carbon structural steel?
Deoxidation mode symbol: f stands for boiling steel; B stands for semi-killed steel; Z stands for killed steel; TZ stands for special killed steel, and killed steel can be left unmarked, that is, Z and TZ can be left unmarked. For example, Q235-AF stands for Class A boiling steel.
Carbon steel for special purposes, such as bridge steel and marine steel, basically adopts the representation method of carbon structural steel, but the letter indicating the purpose is attached at the end of the steel number.
Carbon structural steel consists of Q+ number+quality grade symbol+deoxidation method symbol. Its steel grade is preceded by "Q", which represents the yield point of steel, and the number behind it represents the yield point value in MPa. For example, Q235 stands for carbon structural steel with a yield point (σs) of 235 MPa.
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