1. Ordinary carbon structural steel: carbon structural steel is divided into 5 grades according to the yield strength of steel: Q195, Q215, Q235, Q255, Q275. Each grade is divided into A, B, C, D grades due to different quality. Q195, Q215, Q235 have good plasticity and can be rolled into steel plates, steel bars, Steel pipes, etc.; Q255, Q275 can be rolled into section steels, steel plates, etc.
2. High-quality carbon structural steel: the grade is expressed in terms of the average mass per thousand of the carbon element content, such as 20#, 45#, etc. High-quality carbon structural steel is mainly used in the manufacture of various machine parts.
3. Carbon tool steel: the grade is expressed in terms of the average mass percent of carbon element content, and is prefixed with T, such as T9, T12, etc. Carbon tool steel is mainly used to manufacture various cutting tools, molds, measuring tools, etc.
4. Cast steel: cast steel grades are prefixed with ZG in front of the number. Cast steel is mainly used to manufacture parts with complex shapes and requiring certain strength, plasticity and toughness, such as gears, couplings, etc.
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