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Chemical Influence Of Carbon Steel
- Aug 15, 2018 -

The properties of carbon steel mainly depend on the carbon content and microstructure of the steel.Under annealing or hot rolling, as the carbon content increases, the strength and hardness of the steel increases, while the plasticity and impact toughness decreases (see figure).Poor weldability and cold bending.Therefore, steel used in engineering structure is usually limited in carbon content.The residual elements and impurity elements, such as manganese, silicon, nickel, phosphorus, sulfur, oxygen and nitrogen, also affect the properties of carbon steel.These effects sometimes reinforce each other and sometimes offset each other.For example, sulphur, oxygen and nitrogen at the interface can all increase the hot brittleness of steel, while appropriate manganese can reduce or partially offset its hot brittleness.In addition to manganese and nickel, the residual elements in the initial part reduce the impact toughness of the steel and increase the cold brittleness.In addition to sulfur and oxygen reducing strength, other impurity elements increase the strength of steel to different degrees.Almost all the impurity elements can reduce the plasticity and weldability of steel.

Hydrogen can cause many serious defects in steel, such as white spot, spot-like segregation, hydrogen embrittlement, surface bubbling and cracks in the weld hot zone.To guarantee the quality of steel, hydrogen content in steel must be reduced as much as possible (see stress corrosion cracking and hydrogen embrittlement).The residual elements brought by deoxygenation, such as aluminum, can reduce the aging tendency of low carbon steel, refine grain and improve the toughness of steel at low temperature, but the surplus should not be too much.The residual elements brought into the furnace, such as nickel, chromium, molybdenum and copper, can improve the hardenability of steel when the content is high.