Basic knowledge of steel pipe

Influence of several main elements in steel on steel properties

Carbon (c): As the carbon content increases, the yield point and tensile strength increase, but the plasticity and impact properties decrease. If the carbon content is too high, intergranular corrosion may be unqualified. The boundary between steel and iron is controlled by the C content: <2.11% is steel.

Silicon (Si): Si is a deoxidizer and desulfurizer, which has higher strength and hardness, which can improve the hot workability 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 the steel, while maintaining good plasticity and toughness. Influence of several main elements in steel on steel properties

Molybdenum (Mo): Adding molybdenum to steel can improve the mechanical properties of steel.

Titanium (Ti): Titanium is a deoxidizer in steel. Reduce effectiveness sensitivity and cold brittleness. Adding a certain amount of titanium to the 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 causes the steel to become hot-embrittled, reduces the ductility and toughness of the steel, easily causes cracks during forging, and also reduces the corrosion resistance of the 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 effectiveness sensitivity. The right amount of nitrogen can improve the pitting resistance and strength of stainless steel.