Explanation

As used low-cardon steel with ferrite and partial pearlite structure. Most engineering structural steel belong to ferritic pearlite steel with low strength, which decreases with the decrease of carbon content or pearlite volume fraction in steel. The as used structure of ferrite-pearlite steel is a balanced structure, so it has good toughness and weldability. In order to improve the strength of ferrite-pearlite steel, fine-grained or ultra-fine grained controlled rolling technology is widely used to produce fine-grained strengthening and adding appropriate microalloying elements to produce microalloyed carbonitride precipitation strengthening. In order to further improve the toughness and weldability of ferrite-pearlite steel, it is an important development direction to reduce the carbon content and even the pearlite fraction, thus developing low pearlitic steel and non pearlitic steel.

Classification