The featurs and usage of carbon structural steel.doc

The features and usage of carbon structural steel (1) Q195, Q215, Q235A and Q235B plasticity is good, has the certain strength, usually rolled into steel, steel plates, steel pipes, etc.; Q235C Q235D, can be used for important components; Q235 and Q275 high strength, usually rolled into steel, steel plates for artifacts. (2) carbon structural steel has good plasticity and toughness, easy to forming and welding, often at hot state, generally not to carry out heat treatment, can satisfy the requirements of the general engineering components, so widely used. Mechanical and electrical engineering, for example, common in all kinds of steel, steel bar, steel wire, etc., the high quality carbon steel also can be made into steel wire, steel strand, round steel, high strength bolt and prestressed anchorage, etc. (2) low alloy structural steel 1. Low alloy structural steel grade. Low alloy structural steel, also known as high strength low alloy steel, according to the division yield strength, the total of Q345, Q390, of Q420 and Q460, Q500, Q550, Q620 and Q690 eight strength grade. 2. The features and usage of low alloy structural steel (1) low alloy structural steel is adding trace alloy elements in ordinary steel with high strength, high toughness, good cold forming and welding performance, low ductile-brittle transition temperature and good comprehensive mechanical properties such as corrosion resistance, such as, Q345 intensity of about 20% to 30% higher than the general carbon steel Q235 and atmospheric corrosion resistance of 20% to 38%, with its manufacturing engineering structure, the weight can reduce 20% to 30%. (2) low alloy structural steel is mainly used in Bridges, steel structure, boiler steam drum, pressure vessel, pressure piping, vessels, vehicles, heavy rail, light rail and other manufacturing, use it to replace carbon structural steel, can greatly reduce the quality of structure, save steel. For example, used in the mechanical and electrical engin