What is alloy steel 30CrMnTi gear steel

30CrMnTi alloy steel is a kind of titanium carburizing steel, which is often called gear steel because it is commonly used in gear manufacturing industry. Sometimes it can also be used as quenched and tempered steel. After carburizing and quenching, it has the characteristics of good wear resistance, high static strength, and good heat treatment process. After carburizing, 30CrMnTi gear steel can be directly cooled and quenched, and the quenching deformation is very small. When tempering at high temperature, it has temper brittleness.

Chemical composition of 30CrMnTi gear steel:
Carbon C: 0.24-0.32, Silicon Si: 0.17-0.37, Manganese Mn: 0.80 - 1.10, Sulfur S: the allowable residual content is less than or equal to 0.035, Phosphorus P: allowable residual content is less than or equal to 0.035, Chromium Cr: 1.00 - 1.30, Ni: the allowable residual content is less than or equal to 0.030, Cu: the allowable residual content is less than or equal to 0.030, Ti: 0.04-0.10.

Mechanical properties of 30CrMnTi gear steel:
Tensile strength σb (MPA): ≥ 1470 (150), Elongation δ5 (%): ≥ 9, Reduction of area ψ (%): ≥ 40, Impact energy Akv (J): ≥ 47, Impact toughness value αkV (J / cm2): ≥ 59 (6), Hardness: ≤ 229HB.

The heat treatment specification and microstructure of 30CrMnTi steel are as follows:
Heat treatment specification: quenching: 880℃ for the first time, 850℃ for the second time, oil cooling; tempering 200℃, water cooling and air cooling.
Microstructure: tempered martensite.

30CrMnTi alloy steel delivery status:
Delivered in heat treated (normalized, annealed or tempered) or non heat treated condition.

Application direction of 30CrMnTi gear steel:
30CrMnTi steel is mainly used as carburizing steel. It can be cooled and quenched directly after carburizing. It has high bending strength and good wear resistance. It can be used after quenching, low temperature tempering or quenching and tempering, with medium machinability. 30CrMnTi alloy steel can be used to manufacture carburized parts with high strength in the center, such as gear shaft, gear, worm, etc. It can also be used to manufacture quenched and tempered parts, such as driving gears with large section on automobiles and tractors.