1.2738 mold steel
Main performance editor-1.2738 MOULD STEEL
- Uniform hardness
2.Excellent polishing performance
3.Good machining performance
4.Pre-hardened plastic mold steel
- Nitriding can be applied
- Suitable surface treatment, such as: Cr plating
Physical properties edit
(Sample hardness 340HBW, at room temperature and high temperature)
1) Temperature 20 ° C / 200 ° C / 400 ° C, density 7.8g / cm / 7.75g / cm / 7. 7g / cm.
2) Temperature 20 ~ 200 ° C / 20 ~ 400 ° C, coefficient of linear expansion: 12.6 × 10K / 13.5 × 10K.
3) Temperature 20 ° C / 200 ° C / 400 ° C, thermal conductivity 29.0W · (m · K) /29.5W· (m · K) /31.0W· (m · K)
4) Temperature 20 ° C / 200 ° C / 400 ° C, elastic modulus: 205000MPa / 200000MPa / 185000MPa
Editing of mechanical properties
(Sample hardness 340HBW)
1) Temperature 20 ° C / 200 ° C / 400 ° C, tensile strength 1100MPa / 1050MP8 / 850MPa.
2) Temperature 20 ° C / 200 ° C / 400 ° C, conditional yield strength 980MPa / 925MPa / 770MPa.
3) Temperature 20 ° C / 200 ° C / 400 ° C, reduction in area of 49% / 51% / 52%
4) Temperature 20 ° C / 200 ° C / 400 ° C, elongation 13% / 14% / 16%
5) Temperature 20 ° C / 200 ° C / 400 ° C, impact toughness (≥) 20J / cm / 32J / cm / 42J / cm
Process specification editor
Soft annealing
The annealing temperature is 710 ~ 740 ° C, and the heat preservation time is determined by 1h per 25mm wall thickness. After the heat preservation, it is cooled with the furnace.
Destress
The heating temperature is 600 ° C (annealed state), 550 ° C (quenched and tempered state). The heat preservation time is determined as 1h per 50mm wall thickness. After the heat preservation, it is cooled with the furnace.
Quenching and tempering
Preheating temperature is 500 ~ 600 ° C, quenching temperature is 840 ~ 880 ° C, heat preservation is 30min (the mold must be quenched in a protective atmosphere to avoid oxidation and decarburization). Oil-cooled, cooled to 50 ~ 70 ° C, and tempered immediately.
Tempering and holding time is determined according to the thickness of the workpiece 1h every 25mm, at least 2h. Tempering temperature 180 ° C / 200 ° C /
300 ° C / 400 ° C / 500 ° C / 600 ° C, hardness 52HRC / 51HRC / 48 HRC / 46HRC / 42HRC / 34HRC.
Induction hardening
The steel can be surface-hardened to 50HRC by flame or induction hardening, and air-cooled after hardening. Small modules can use general quenching medium. After hardening, they should be tempered immediately. The tempering temperature is 180 ~ 200 ° C.
Nitriding Specification
Nitriding temperature × nitriding time: 525 ° C × 20h, nitride layer thickness 0.30mm; 525 ° C x30h, nitride layer thickness 0.35mm; 525 ° C × 50h, nitride layer thickness 0.50mm.
Soft nitriding
After 570 ° C for 2h, the surface hardness of the mold is about 700HV, and the depth of the nitrided layer is about 0.1mm. [2]
Practical application
1.-Skin pattern, pear skin pattern, imitation stone pattern etching mold.
2.- Transparent plastics such as stationery boxes and daily necessities containers require high gloss molds.
3.- Particularly suitable for hard rubber (PS) and non-breakable rubber (ABS) parts.
4.- Large molds with high output requirements such as automobile bumpers, interior parts, refrigerators, and air conditioners.
