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 and D grades due to different quality. Q195, Q215, Q235 good plasticity, can be rolled into steel plate, steel bar, steel pipe, etc. Q255, Q275 can be rolled into steel, steel plate, etc.

2. High-quality carbon structural steel:

The steel number is expressed as the average mass thousandth fraction of the carbon content. Such as 20#, 45#, etc. Usage: Mainly used for manufacturing various machine parts.

3. Carbon tool steel:

The steel number is expressed as the average mass fraction of carbon content, and is preceded by a T. Such as T9, T12, etc. Application: Mainly used in manufacturing various cutting tools, molds, measuring tools and so on.

4. Cast steel:

The cast steel grade is prefixed with ZG before the number. Uses: Mainly used in the manufacture of complex shapes and require a certain strength, plasticity and toughness of parts, such as gears, couplings, etc.