What are the main steel grades of carbon structural steel in China

Q195 carbon structural steel:
Q195 steel is used as structural parts: wire rod for wire drawing; general engineering steel, such as low carbon steel wire, steel plate, welded steel pipe, steel nail, steel mesh, chimney, roof panel, bolt, rivet, plow, etc.; special shaped structural parts; welded pipe used for conveying water, air, oil, heating steam and other general low pressure fluid; section steel, such as worker, groove, angle steel and profile, etc.

Q215A carbon structural steel:
Q215A steel has higher strength than Q195. In addition to the above purposes, it is mainly used for building structural parts, welded pipes, wire drawing, etc.

Q215B carbon structural steel:
The difference between Q215B steel and Q215A is that it can guarantee + 20℃ impact energy. Its purpose is similar to Q215A, but it can bear impact load.

Q235A carbon structural steel:
Q235A material is the most productive grade of carbon structural steel, including steel plate, steel strip, section steel, steel bar, wire rod (for wire drawing and structure), pipe, etc. Steel Q235A is used for all kinds of structural steel (bar, tool, groove, angle steel), medium thick steel plate, rivet, spike; all kinds of mechanical structural parts, such as pull rod, bolt, screw, hook, collar, shaft, connecting rod, pin, wire rod steel, etc. Welded pipe is used to transport low pressure fluid of water and gas.

Q235B carbon structural steel:
Compared with Q235A, Q235B steel should bear impact load. And it guarantees +20℃ industrial impact energy.

Q235C / Q235D carbon structural steel:
The impact energy is guaranteed at 0℃ for Q235C and -20℃ for Q235D. Q235C and Q235D steel are mainly used for various mechanical and engineering structures working at lower temperatures.

Q275A / B / C / D carbon structural steel:
Q275 steel is rolled into plate, shape and bar. It has high strength and can replace low alloy structural steel. Material Q275 is also used as fishplate, a variety of special-shaped steel for agricultural machinery, etc.