24 July 2021 Gear Steel Bar
20CrMnTiH Gear Steel Bar
20CrMnTiH gear steel is a carburizing steel with good performance, with high hardenability, after carburizing and quenching, it has a hard and wear-resistant surface and a tough core, has high low-temperature impact toughness, medium weldability, after normalizing Good machinability. It is used to manufacture important parts with a cross section of less than 30mm that are subject to high speed, medium or heavy load, impact and friction, such as gears, ring gears, gear shaft crossheads, piston parts, and various special parts of automobiles and airplanes.
20CrMnTiH researched for instead of 18CrMnTi gear steel, which is widely used as carburizing parts. It is used in the automobile and tractor industries for important carburized parts with a cross-section below 30mm, bearing high speed, medium or heavy load, and impact and friction, such as gears, shafts, and teeth. Ring. Gear shaft. Sliding bearing main shaft. Cross head. Claw clutch. Worm etc.
Chemical Composition:
| C(％) | Si(％) | Mn(％) | P(％) | S(％) | Cr(％) | Cu(%) | Ni(%) | Ti(%) |
|---|---|---|---|---|---|---|---|---|
| 0.17~0.23 | 0.17~0.37 | 0.80~1.15 | ≤0.035 | 0.035 | 1.00~1.35 | ≤0.035 | ≤0.035 | 0.04~0.10 |
Mechanical Properties:
| Yield Rp0.2 (MPa) | Tensile Rm (MPa) | Impact KV/Ku (J) | Elongation A (%) | Reduction in cross section on fracture Z (%) | Impact toughness αkv (J/cm2)： | Hardness | Elastic Modulus | Poisson's ratio | Heat Transfer Rate |
|---|---|---|---|---|---|---|---|---|---|
| ≥835(85) | ≥1080(110) | ≥55 | ≥10 | ≥45 | ≥69(7) | ≤217HB | 207Gpa | 0.29 | 1.26 × 10-51/℃ |
Heat treatment Related
Annealing of 20CrMnTiH Alloy Gearing steel
Slowly heated to 790-810 ℃ and store enough times, thoroughly heated steel, Then cool slowly in the furnace.
Quenching and temperature of 20CrMnTiH gear steel
Heated slowly to 788°C, Then put in salt-bath furnace keep temperature range from 1191 ℃ to 1204 ℃, quenching by oil can get 60 to 66 HRc hardness.
High temperature tempering: 650-700℃,cool in air, get hardness from 22 to 30HRC.
Lowtemperature tempering: 150-200 ℃, Cool in air, get hardness from 61 to 66HRC.
Hot work and cold work of 20CrMnTiH Alloy Gearing steel
20CrMnTiH steel can hot worked at 205 to 538°C, 20CrMnTiH Gearing steel can be cold worked using conventional techniques in the annealed or normalized conditions.