Transmission Gear MIM Parts

Item

Material

Production Process

Sintering Temperature

Mold

Custom

Gearbox gear

20CrMnTi

Metal Injection Molding

1350°C-1500°C

To be customized

Yes

Chemical Composition

C: 0.17～0.23
Si: 0.17～0.37
Mn: 0.80～1.10
Cr: 1.00～1.30
S: high-quality steel not more than 0.030
High-grade high-quality steel is not more than 0.020
Special high-quality steel is not more than 0.010
P: high-quality steel not more than 0.030
High-grade high-quality steel is not more than 0.020
Super high-quality steel is not more than 0.020
Ni: high-quality steel not more than 0.30
High-grade high-quality steel is not more than 0.30
Special high-quality steel is not more than 0.30
Cu: high-quality steel not more than 0.30
High-grade high-quality steel is not more than 0.25
Special high-quality steel is not more than 0.25
Ti: 0.04～0.10
Note 1: The copper content of steel for hot press processing is not more than 0.2%

Available Materials

Low carbon stainless steel, titanium alloy (Ti, TC4), copper alloy, tungsten alloy, hard alloy, high temperature alloy (718, 713)

Finish

Dimensional Accuracy

Product Density

Appearance Treatment

Appropriate Weight

Roughness 1～5μm

（±0.1%～±0.5%）

92～95%

Mirror Reflection

0.03g～400g）

Mechanical properties

Tensile strength σb (MPa): ≥1080(110)
Yield strength σs (MPa): ≥835(85)
Elongation δ5 (%): ≥10
Reduction of area ψ (%): ≥45
Impact energy Akv (J): ≥55
Impact toughness value αkv (J/cm2): ≥69(7)
Hardness: ≤217HB
Sample size: sample blank size is 15mm
20CrMnTi Density: 7.8×103kg/m3
Elastic modulus: 207GPa
Poisson's ratio: 0.25
Thermal conductivity: 1.26×10-5 (1/℃)

Heat treatment

●Heat treatment specification and metallographic structure:
Heat treatment specifications: Quenching: 880°C for the first time, 870°C for the second time, oil cooling; tempering 200°C, water cooling, air cooling.
Detailed heat treatment specifications and mechanical properties:
Sample blank size/mm: 15
Heat treatment|quenching|heating temperature/℃|first quenching: 880
Heat treatment|quenching|heating temperature/℃|second quenching: 870
Heat Treatment|Quenching|Coolant: Oil
Heat treatment|tempering|heating temperature/℃: 200
Heat Treatment | Tempering | Coolant: Water, Air
Mechanical properties|tensile strength σb/MPa|≥: 1080
Mechanical properties|yield point σs/MPa|≥: 850
Mechanical Properties|Elongation δ5(%)|≥: 10
Mechanical properties|area reduction ψ(%)|≥: 45
Mechanical Properties|Impact Absorption AKV/J|≥: 55
Delivery state hardness HBS|≥: 217
●Heat treatment specification and metallographic structure:
Heat treatment specifications: Quenching: 880°C for the first time, 870°C for the second time, oil cooling; tempering 200°C, water cooling, air cooling;
Metallographic structure: tempered martensite.
●Delivery status: delivery in heat treatment (normalizing, annealing or high temperature tempering) or without heat treatment, delivery status should be specified in the contract.
●Density and elastic modulus of 20CrMnTi:
Density: 7.8×103kg/m3 Elastic modulus: 207GPa Poisson’s ratio: 0.25 Thermal conductivity: 1.26×10-51/℃
●20CrMnTi normalizing
20CrMnTi normalizing, 20CrMnTi steel is heated at 860°C and rapidly cooled to 680°C for air cooling and high temperature normalizing process for heating at 960°C and then fog-cooled. The differences and functions of the two processes are compared.