Various chemical elements have different effects on the properties of steel. Here are some common elements and operations:
• Carbon (C): As the carbon content increases, the yield point and tensile strength increase, but the plasticity and impact properties decrease. Too high a carbon content can easily cause intergranular corrosion failure. The boundary between steel and iron is controlled by the C content: <2.11% is steel
• Silicon (Si): Si is a deoxidizer and desulfurizer, has high strength and hardness, and can improve the hot working properties of steel.
• Chromium (Cr): Chromium can significantly improve the strength, hardness and wear resistance of steel, but at the same time it will reduce plasticity and toughness.
• Nickel (Ni): Nickel can increase the strength of steel and keep the steel in good plasticity and toughness.
• Molybdenum (Mo): Adding molybdenum to steel can improve the mechanical properties of steel.
• Titanium (Ti): Titanium is a deoxidizer in steel. Reduces effective sensitivity and cold brittleness. Adding a certain amount of titanium to steel has the ability to resist intergranular corrosion.
• Phosphorus (P): Phosphorus is a harmful element in steel, which increases the cold brittleness of steel, deteriorates welding performance, reduces plasticity, and deteriorates cold bending performance. Generally, the lower the phosphorus content in steel, the better.
• Sulfur (S): Sulfur is a harmful element in steel, which makes steel hot brittle, reduces the ductility and toughness of steel, easily causes cracks during forging, and also reduces the corrosion resistance of steel. Therefore, the sulfur content must be controlled as low as possible.
• Nitrogen (N): Nitrogen can improve the strength, low temperature toughness and weldability of steel. Increase the sensitivity of the actual effect. The right amount of nitrogen can improve the pitting corrosion resistance and strength of stainless steel.
austenitic welded pipe
