P20+N, 2738, Tool Steel for Mold Making, Mold Building

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Jiangsu Longchangxing New Material Technology Co Ltd.

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2738
Forged
AISI, JIS, ASTM, DIN, GB
IS0
YMT
Container and Pallets
according to customers
China
7224909090
Product Description

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 :

AlloyCSiMnCrMoNi
% in weight0.35-0.450.20-0.401.40-1.701.80-2.200.15-0.300.90-1.30


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 °C20-200 °C20-300 °C20-400 °C20-500 °C20-600 °C20-700 °C
11.712.313.013.313.713.714.0



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)
 
100200300400500600700
HRC51504846423628

Heat-Treatment
Soft annealingQuenchingTempering
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.
 

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