Introduction of low carbon steel
Low carbon steel is generally rolled into angle steel, channel steel, I-beam, steel pipe, steel strip or steel plate for the production of various building components, containers, boxes, furnaces and agricultural machinery. High-quality low-carbon steel is rolled into a thin plate to make deep-drawn products such as automobile cabs and engine covers; it is also rolled into bars for the production of mechanical parts with low strength requirements. Low carbon steel is generally not heat treated before use, and carburized or cyanidated with a carbon content of 0.15% or more is used for parts such as shafts, bushings and sprockets which require high surface temperature and good wear resistance.
Low carbon steel is limited in its use due to its low strength. Appropriate increase of manganese content in carbon steel, and the addition of trace amounts of vanadium, titanium, niobium and other alloying elements can greatly improve the strength of steel. If the carbon content in the steel is lowered and a small amount of aluminum, a small amount of boron and a carbide forming element are added, the ultra-low carbon bainite group can be obtained with high strength and good plasticity and toughness.