YMT 2738
Introducing Plastic Mold Steel YMT 2738, the trailblazing pre-hardened alloy steel designed specifically for molds. This innovative steel boasts exceptional through-hardening capabilities, superior machinability, and outstanding polishability, making it a top choice for demanding applications.
YMT 2738 has been meticulously engineered for large-dimension molds, ensuring a remarkable degree of through-hardening throughout the
entire section.
Main Features :
• excellent machinability;
• very good suitability for photo-engraving;
• very good suitability for polishing;
• excellent suitability for nitriding, in order to increase the wear resistance;
• good wear resistance in the whole section of the mold;
• internal homogeneous hardness on blocks in the whole section of the mold;
Chemical Analysis :
| Alloy | C | Si | Mn | Cr | Mo | Ni |
| % in weight | 0.35-0.45 | 0.20-0.40 | 1.40-1.70 | 1.80-2.20 | 0.15-0.30 | 0.90-1.30 |
Application
Suitable for large-dimension, plastic injection molds requiring uniform hardness, strength and toughness, take for instance:
- -Molds for auto bumpers, dashboards and other interior and exterior parts in auto industry,
- -Cases and frames for plastic molds of home appliances, such as TV, washing machines and AC, etc.
- -Cases for plastic molds of office supplies, e.g. printers, copy machines, paper shredder, trash-bins
- -Mold base for die casting
Physical Property
Modulus of Elasticity [103x N/mm2]: 205
Density[g/cm3]: 7.80
Specific Heat Capacity [J/Kg.K]: 460
Thermal Conductivity [W/m.K]: 29.0
Coefficient of Linear Thermal Expansion 10-6°C-1
| 20-100 °C | 20-200 °C | 20-300 °C | 20-400 °C | 20-500 °C | 20-600 °C | 20-700 °C |
| 11.7 | 12.3 | 13.0 | 13.3 | 13.7 | 13.7 | 14.0 |
Non-metallic Inclusion
As per ASTM E45 method A
At ≤1.5, Bt≤l.5, Ct≤l.5, Dt≤l.5; Ad≤1,5, Bd≤l.5, Cd≤1.5, Dd≤l.5 or DIN50602 or subject to customer's requirements.
UT Test Standard
SEP 1921 Group3, Class E/e or subject to customer's requirements.
Delivery Conditions
Delivered in pre-hardened condition: HRC 28-34, and HRC 33-38 optional
Tempering
| Tempering temperature (degree C) | 100 | 200 | 300 | 400 | 500 | 600 | 700 |
| HRC | 51 | 50 | 48 | 46 | 42 | 36 | 28 |
Heat-Treatment
| Soft annealing | Quenching | Tempering |
| 710-740 (OC) | 840-880 (OC) | 560-680 (OC) |
Annealing: Heat to 710-740(OC), cool slowly. This will produce a maximum Brinell hardness of 235.
Stress Relieving: Heating to 650(OC),holding for one hour at heat, followed by air cooling.
Quenching: Harden from a temperature of 840-880(OC), followed by oil, air or warm bath 180-220(OC) quenching. Hardness after quenching is 52 HRC.
