Chrome vanadium steel has better mechanical properties and more stable chemical properties than ordinary carbon steel.
In tool steel metal materials,
1) The general term for iron-carbon alloys with carbon content (mass percentage) between 0.02% and 2.11%.
2) When the total impurity content is less than 0.2% and the carbon content does not exceed 0.0218%, it is called industrial pure iron. Industrial pure iron is also a kind of steel, and its chemical composition is mainly iron.
3) When the carbon content exceeds 2.4% (the amount that can be retained in the austenite solid solution at the eutectic temperature), it is called cast iron. It is mainly composed of iron, carbon and silicon.
Carbon steel is an iron-carbon alloy with a carbon content of 0.0218% to 2.11%. Also called carbon steel. Generally contains a small amount of silicon, manganese, sulfur, phosphorus. The higher the carbon content in carbon steel, the greater the hardness and the higher the strength, but the plasticity is lower.
1) Medium carbon steel is carbon steel with a carbon content of 0.25% to 0.65%. Medium carbon steel is often tempered when it is used, so it is also called tempered steel.
2) Carbon content less than 0.25% (mass fraction) is called low carbon steel. Low carbon steel is often carburized after surface hardening, so it is also called carburized steel.
3) Carbon content higher than 0.60% (mass fraction) is called high carbon steel. High-carbon steels are often surface-quenched, so they are also called hardened steels.
In addition to iron and carbon, other alloy elements are added to carbon steel, which is called alloy steel.
1) There are binary alloy steel, ternary alloy steel, quaternary alloy, etc. according to the number of types of alloy elements added.
2) According to the amount of added alloy elements, there are low alloy steel, medium alloy steel, high alloy steel, etc .:
(1) Low alloy steel The total content of alloy elements is less than or equal to 5%;
(2) Medium alloy steel The total content of alloy elements is between 5% and 10%;
(3) High alloy steel The total content of alloy elements is greater than or equal to 10%;
There are many alloy steels with special or special purposes, they will be called: spring steel, bearing steel, tool steel, structural steel, boiler steel, marine steel, bridge steel, construction steel, rail steel, heat resistant steel, etc. Wait.
The chrome vanadium steel you mentioned refers to the alloy steel with a certain amount of chromium vanadium alloy elements.
1) In carbon steel, chromium can significantly increase the strength, hardness and wear resistance, but at the same time reduce the plasticity and toughness. Chromium can also improve the oxidation resistance and corrosion resistance of steel, so it is an important alloy element of stainless steel and heat-resistant steel.
2) Add vanadium to alloy steel to act as a deoxidizer. The addition of 0.5% vanadium in steel can refine the structure grains and improve the strength and toughness. The carbide formed by vanadium and carbon can improve the resistance to hydrogen corrosion under high temperature and high pressure.
3) Therefore, chrome vanadium steel has better mechanical properties and more stable chemical properties than ordinary carbon steel.