The material lays the foundation, while heat treatment determines hardness, toughness and service life; only when the two are properly matched can the cutting effect be ensured.
I. Common Materials (Key Points)
1.65Mn: Low cost, good toughness, suitable for low-speed cutting of soft materials (paper, film), poor red hardness
2.SK5/T8~T10: High hardness, moderate cost, for general medium-to-low speed cutting, low impact resistance
3.9CrSi: Balanced wear resistance and toughness, mainstream economical type, suitable for long blades, transverse/longitudinal cutting blades
4.Cr12/Cr12MoV: High hardness and wear resistance, small deformation, top choice for high-end applications, suitable for high-speed cutting of thick films/aluminum foils
5.SKD11/DC53: High hardness and high toughness, high-end alternative to imported materials, suitable for high-speed and high-precision cutting
6.High-Speed Steel (M2): Excellent red hardness, for ultra-high-speed cutting, high cost
Cemented Carbide: Extremely wear-resistant (service life 10~30 times that of ordinary steel), suitable for highly abrasive materials, brittle and expensive
II. Core Heat Treatment (Simplified)
1.Annealing: Facilitates processing and relieves internal stress
2.Quenching: Heating (800~1050℃) + oil cooling / air cooling to improve hardness and wear resistance
3.Tempering: Low temperature preserves hardness and reduces brittleness; medium temperature enhances toughness for balanced performance
Cryogenic treatment (-70~-196℃): Essential for high-end knives, stabilizes dimensions, boosts hardness and wear resistance
4.Fine grinding: Ensures precision and sharp cutting edges
III. Core Correspondence
●65Mn/SK5: Quenching + Low-temperature Tempering (HRC58-62)
●9CrSi: Quenching + Tempering (HRC60-63)
●Cr12MoV/SKD11/DC53: Quenching + Cryogenic Treatment + Tempering (HRC61-65)
●High-speed Steel: High-temperature Quenching + Multiple Temperings (HRC64-67)
●Cemented Carbide: Powder Sintering (HRC80-90)
