Supply high quality 20CRNIMO structural steel round steel with excellent quality

The main characteristics of the steel are the steel grades in the American and American standards. The hardenability is similar to steel. Although the content in steel is half that of steel, due to the addition of a small amount of elements, the upper part of the austenite isothermal transformation curve moves to the right and due to the appropriate increase in content, the hardenability of this steel is still very good and the strength is higher than steel. It is commonly used in the manufacture of gears in the engines and transmission systems of small and medium-sized automobiles and tractors. It can also replace steel in the manufacture of carburized parts and cyanide parts that require higher core performance, such as the teeth of cone drill bits used in oil drilling and metallurgical open pit mines. Claw and gear body. Because it contains molybdenum, it not only has good overall performance, but also can withstand a certain temperature. Used for manufacturing steam turbine gear complete rotor internal combustion engine connecting rod valve section forgings.
Chemical composition
Mass fraction (%)
Carbon.~
Silicon.~
Manganese.~
Allowable residual content of sulfur
Round steel
Permissible residual content of phosphorus
Chromium.~
Nickel.~
Molybdenum.~
Allowable residual content of copper
Mechanical properties
[Sample Blank size]
[Heat treatment]
Quenching heating temperature (℃) coolant oil
Tempering heating temperature (℃) coolant air
Round steel
Round steel< br/> Tensile strength&()
Yield strength&()
Elongation&(%)
Area reduction&(%)
Impact energy
Impact toughness value & Brinell hardness (/) (annealed or high temperature tempering state)
The delivery state is delivered in a heat treatment (normalizing, annealing or high temperature tempering) or non-heat treatment state. The delivery state should be in the contract indicated in.