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What is the effect of chemical elements on the performance of stainless steel?

What is the effect of chemical elements on the performance of stainless steel?

Time:2022-03-16 Source:WUXI JIANO SPECIAL STEEL CO.

What is the effect of chemical elements on the performance of stainless steel? Today Wuxi JiaNuo special steel to give you an introduction. We know that there are various chemical elements in stainless steel, which constitute hundreds of different models, so what are the roles of these chemical elements in stainless steel in the end?

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1, the carbon element: the steel carbon content increases, the yield point and tensile strength rise, but plasticity and impact decreases, when the carbon amount of 0.23% over, the welding characteristics of steel is affected, so suitable for welding of low-alloy structural steel, carbon content generally does not exceed 0.20%. High carbon will also reduce the steel’s ability to resist atmospheric corrosion, high-carbon steel in the outdoor yard is prone to rust; in addition, carbon can increase the steel’s cold brittleness and aging sensitivity.

2, silicon element: in the steelmaking process, silicon is added as a reducing agent and deoxidizer, so the sedimentation steel contains 0.15-0.30% of silicon. If the steel contains more than 0.50-0.60% silicon, silicon even if the alloying element. Silicon can significantly improve the elastic limit of steel, yield point and tensile strength, so it is mainly suitable for spring steel. The addition of 1.0-1.2% silicon in the tempered alloy structural steel, the strength can be increased by 15-20%. Silicon and molybdenum, tungsten, chromium and other combinations, have improved corrosion resistance and oxidation resistance, can be produced to manufacture heat-resistant steel. Low carbon steel containing 1-4% silicon has high permeability and is suitable for making silicon steel sheets in the electrical appliance manufacturing industry. The amount of silicon increases, will reduce the welding characteristics of steel.

3, manganese element: in the steelmaking process, manganese is an excellent deoxidizer and desulfurizer, general steel containing 0.30-0.50% manganese. Add 0.70% or more in carbon steel, even if “manganese steel”, more general steel not only has sufficient toughness, and higher strength and hardness, improve the hardenability of steel, improve the heat treatment characteristics of steel, such as 16Mn steel than A3 yield point 40% higher. Steel containing 11-14% manganese has high wear resistance and is suitable for excavator buckets, ball mill liners, etc. The amount of manganese increases, weakening the corrosion resistance of steel and reducing the welding characteristics.

4, phosphorus: In general, phosphorus is a harmful element in steel, increasing the cold brittleness of steel, so that the welding characteristics are affected, reduce plasticity, so that the cold bending characteristics are affected. Therefore, the general provisions of the steel phosphorus content of less than 0.045%, high-quality steel provisions are lower.

5, elemental sulfur: sulfur in general is also a harmful element. Make steel thermal embrittlement, reduce the ductility and toughness of steel, in calcining and rolling caused by cracking. Sulfur is also bad for welding characteristics, reducing corrosion resistance. Therefore, the general provisions of sulfur content of less than 0.055%, high-quality steel provisions of less than 0.040%. Add 0.08-0.20% sulfur in the steel, can improve the machinability, generally known as easy to cut steel.

6, chromium element: in alloy structural steel and alloy steel, chromium can significantly improve the strength, hardness and wear resistance, but at the same time reduce plasticity and toughness. Chromium can also improve the oxidation resistance and corrosion resistance of steel, but is an important alloying element of stainless steel, heat-resistant steel.

7, nickel elements: nickel can improve the strength of steel, while maintaining a stable plasticity and toughness. Nickel has a high corrosion resistance to acids and bases, and has the ability to prevent rust and heat at high temperatures. However, because nickel is a more scarce resource, so other alloying elements should be used as far as possible in place of nickel-chromium steel.

The above is the chemical elements have an impact on the performance of stainless steel all content, if there is still do not understand the place can call us. At present, Wuxi JiaNuo special steel has established long-term strategic cooperation with a number of well-known brands, provide products and materials widely used in kitchen and bathroom supplies, environmental protection equipment, building decoration, catering medical, petrochemical, animal husbandry and other fields.