Wear Resistant High Strength Alloy Steel Plate NM550

Wear Resistant High Strength Alloy Steel Plate NM550

Effect of five elements content in NM550 on steel plate properties:

a, carbon (C) : the carbon content in the steel increases, the yield point and tensile strength increases, but the plasticity and impact are reduced, when the carbon content exceeds 0.23%, the welding performance of the steel deteriorates, so the low alloy structural steel used for welding, the carbon content generally does not exceed 0.20%. The high carbon content will also reduce the atmospheric corrosion resistance of the steel, and the high carbon steel in the open air yard is easy to rust; In addition, carbon can increase the cold brittleness and aging sensitivity of steel.

b, silicon (Si) : Silicon is added as a reducing agent and deoxidizer in the steelmaking process, so the killed steel contains 0.15-0.30% silicon. If the silicon content of the steel exceeds 0.50-0.60%, silicon is considered an alloying element. Silicon can significantly improve the elastic limit, yield point and tensile strength of steel, so it is widely used as spring steel. When 1.0-1.2% silicon is added to the tempered structural steel, the strength can be increased by 15-20%. The combination of silicon and molybdenum, tungsten, chromium, etc., has the effect of improving corrosion resistance and oxidation resistance, and can manufacture heat-resistant steel. Low carbon steel containing 1-4% silicon, with very high magnetic permeability, used in the electrical industry to make silicon steel sheet. The increase of silicon will reduce the weldability of the steel.

c, manganese (Mn) : in the steelmaking process, manganese is a good deoxidizer and desulfurizer, and the general steel contains 0.30-0.50% manganese. When more than 0.70% is added to carbon steel, it is considered as "manganese steel", which is not only sufficient toughness, but also has higher strength and hardness than the general steel, improving the quenching of steel and improving the thermal processing performance 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 in excavator buckets, ball mill linings, etc. The increase of manganese content weakens the corrosion resistance of steel and reduces the weldability.

d, phosphorus (P) : under normal circumstances, phosphorus is a harmful element in steel, which increases the cold brittleness of steel, deteriorates the welding performance, reduces plasticity, and deteriorates the cold bending performance. Therefore, the phosphorus content in steel is usually required to be less than 0.045%, and the requirements for high-quality steel are lower.

e, sulfur (S) : Sulfur is also a harmful element in general. The steel produces hot brittleness, reduces the ductility and toughness of the steel, and causes cracks during forging and rolling. Sulfur is also detrimental to welding performance, reducing corrosion resistance. Therefore, the sulfur content is usually required to be less than 0.055%, and the high-quality steel is required to be less than 0.040%. Adding 0.08-0.20% sulfur to the steel can improve the machinability, usually called free-cutting steel.

Product Display

Productive Process

Packing&Delivery