Determination of Quality and Properties of Stainless Steel Round Bars
The quality and performance of stainless steel round bar are determined according to the needs, different needs, different element content.
The higher the carbon content of carbon, the higher the hardness is, but the worse its plasticity and toughness. Sulfur is a harmful impurity in steel. When the steel with high sulfur content is pressed at high temperature, it is easily brittle and is often called hot brittleness. Phosphorus can significantly reduce the plasticity and toughness of steel, especially at low temperatures, this phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus must be strictly controlled.
However, on the other hand, high sulfur and phosphorus content in low carbon steels can make the cutting easier, and it is beneficial to improve the machinability of steel. Manganese can increase the strength of steel, can weaken and eliminate the adverse effects of sulfur(slip on flange), and can improve the hardenability of steel, high-alloy steel (high manganese steel) with high manganese content has good wear resistance and other physical performance. Silicon can increase the hardness of steel, but its plasticity and toughness decrease. Electrical steel contains a certain amount of silicon, which can improve soft magnetic properties. Tungsten can improve the red hardness and thermal strength of steel, and can improve the wear resistance of steel. Chromium can improve the hardenability and wear resistance of steel, and can improve the corrosion resistance and oxidation resistance of steel. Vanadium can refine the grain structure of steel, improve the strength, toughness and wear resistance of steel. When it melts into the austenite at high temperature, it can increase the hardenability of the steel; conversely, when it exists in the form of carbide, it will reduce its hardenability. Molybdenum can significantly improve the steel's hardenability and thermal strength, prevent temper brittleness, improve remanence and coercivity. Titanium can refine the grain structure of the steel, thereby increasing the strength and toughness of the steel. In stainless steel, titanium can eliminate or reduce the intergranular corrosion of steel. Nickel can improve the strength and toughness of steel and improve hardenability. When the content is high, it can significantly change some of the physical properties of steel and alloys and improve the corrosion resistance of steel. Boron When the steel contains traces of boron, the hardenability of the steel can be doubled. Aluminum can refine the grain structure of the steel and suppress the aging of low-carbon steel. Improve the toughness of steel at low temperatures, but also improve the oxidation resistance of steel, improve the wear resistance and fatigue strength of steel. The prominent role of copper is to improve the atmospheric corrosion resistance of ordinary low alloy steels, especially when used in combination with phosphorus.