Effect of carbon, manganese and silicon on the properties of SPV355 steel plate

Effect of carbon element on the performance of SPV355 steel plate:
The carbon content in the steel increases, the yield point and tensile strength increase, but the plasticity and impact resistance decrease. When the carbon content exceeds 0.23%, the welding performance of the steel deteriorates. Therefore, the carbon content of low alloy structural steel used for welding generally does not exceed 0.20%. High carbon content will also reduce the atmospheric corrosion resistance of steel, and the high carbon steel in the open yard is easy to rust; In addition, carbon can increase the cold brittleness and aging sensitivity of steel.

Effect of manganese element on the performance of SPV355 steel plate:
In the process of steelmaking, manganese is a good deoxidizer and desulfurizer. Generally, manganese content in steel is 0.30-0.50%. When 0.70% or more is added to carbon steel, it is considered as "manganese steel". Compared with ordinary steel, steel has not only enough toughness, but also higher strength and hardness, improving the hardenability of steel, and improving the hot working property of steel, such as 16Mn steel is 40% higher than A3 yield point. Steel containing 11-14% manganese has extremely high wear resistance and is used for excavator bucket, ball mill liner, etc. The increase of manganese content will weaken the corrosion resistance of steel and reduce the welding performance.

Effect of silicon element on SPV355 steel plate performance:
Silicon is added as reducing agent and deoxidizer during steelmaking, so killed steel contains 0.15-0.30% silicon. If the silicon content in steel exceeds 0.50-0.60%, silicon is considered as an alloy element. Silicon can significantly improve the elastic limit, yield point and tensile strength of steel, so it is widely used as spring steel. The strength of quenched and tempered structural steel can be increased by 15-20% by adding 1.0-1.2% silicon. Silicon, combined with molybdenum, tungsten, chromium, etc., can improve corrosion resistance and oxidation resistance, and can be used to manufacture heat-resistant steel. Low-carbon steel containing 1-4% silicon has extremely high permeability, and is used for making silicon steel sheet in electrical industry. The increase of silicon content will reduce the weldability of steel.