GB 700 Q255A steel has high strength, good ductility, high corrosion resistance and excellent weldability. It also has high work hardening rate, meaning it is capable of withstanding heavy loads and wear and tear. This makes it an ideal material for use in a variety of structural applications.

GB 700 Q275 steel is known for its hardness and strength. It has a Brinell hardness of 415 and can be strengthened further through heat treatment. GB 700 Q275 steel is often used in applications that require toughness and strength, such as in bridges, buildings, and other structures.

The chemical composition of GB 700 Q255B steel is very important to its performance. It is made up of a combination of iron and carbon (98.2%), along with small percentages of other elements such as manganese, sulfur, phosphorus, and silicon (1.2%). The carbon content of the steel allows it to be stronger than other lower-carbon steels.