35CrMo Alloy Steel Chemical Composition

35CrMo alloy steel is a type of steel that has a high amount of carbon, chromium, and molybdenum in its composition. 35CrMo steel is often used to make gears, shafts, and other machine parts that require high strength and toughness. The chemical composition of the steel, particularly its carbon, chromium, manganese, and molybdenum content, has a significant impact on its properties. Understanding the chemical composition of 35CrMo alloy steel is important when selecting the appropriate steel for a particular application.

The chemical composition of 35CrMo alloy steel is as follows:

Carbon: 0.32–0.40%

Chromium: 0.80–1.10%

Manganese: 0.40–0.70%

Molybdenum: 0.15–0.25%

Phosphorus: ≤0.035%

Sulfur: ≤0.035%

Silicon: 0.17–0.37%

Carbon is an important element in steel because it increases its strength and hardness. It also improves the toughness of the steel. The carbon content in 35CrMo alloy steel is between 0.32% and 0.40%. This is considered a medium carbon steel.

Chromium is a key element in 35CrMo alloy steel because it improves the corrosion resistance of the steel. It also increases the hardenability of the steel. The chromium content in 35CrMo alloy steel is between 0.80% and 1.10%. This is a high amount of chromium, which means that the steel has good resistance to corrosion.

Manganese is added to steel to improve its toughness and to act as a deoxidizer during the production process. It also helps to remove impurities from the steel. The manganese content in 35CrMo alloy steel is between 0.40% and 0.70%.

Molybdenum is a key element in 35CrMo alloy steel because it increases the strength of the steel. It also improves its hardenability and machinability. The molybdenum content in 35CrMo alloy steel is between 0.15% and 0.25%.

Phosphorus and sulfur are impurities that are found in steel. They can affect the properties of the steel, such as its strength and toughness. The maximum amount of phosphorus and sulfur allowed in 35CrMo alloy steel is 0.035%.

Silicon is added to steel to improve its strength and toughness. It also helps to deoxidize the steel during the production process. The silicon content in 35CrMo alloy steel is between 0.17% and 0.37%.

How the Chemical Composition Affects the Properties of 35CrMo Alloy Steel

The tensile strength of 35CrMo alloy steel is between 930 and 1080 MPa. The high carbon content in the steel contributes to its high tensile strength. The chromium and molybdenum in the steel also contribute to its strength.

The yield strength of 35CrMo alloy steel is between 785 and 930 MPa. The yield strength is an important property because it represents the point at which the steel will start to deform permanently. The high carbon content in the steel contributes to its high yield strength.

The elongation of 35CrMo alloy steel is between 12% and 20%. Elongation is a measure of how much the steel can stretch before it breaks. The high molybdenum content in the steel contributes to its high elongation.

The impact toughness of 35CrMo alloy steel is between 63 and 80 J/cm². Impact toughness is a measure of the material's ability to absorb energy during impact. The high manganese content in the steel contributes to its high impact toughness.