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Nitriding Treatment Comparison Table for Molds
The following is a detailed comparison table of mold nitriding treatment, including the main process types, characteristics and application scenarios
Nitriding Treatment Comparison Table for Molds |
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| Parameter | Gas Nitriding | Plasma Nitriding | Salt Bath Nitriding | Liquid Nitriding |
| Process Temp. | 500-580℃ | 350-600℃ | 500-580℃ | 500-580℃ |
| Duration | 10-100 hours | 2-20 hours | 0.5-4 hours | 1-4 hours |
| Surface Hardness | 800-1200 HV | 800-1200 HV | 500-1000 HV | 500-900 HV |
| Case Depth | 0.1-0.8 mm | 0.1-0.5 mm | 0.005-0.025 mm | 0.005-0.020 mm |
| Distortion | Small | Minimal | Moderate | Moderate |
| Eco-Friendliness | Good | Excellent | Poor (cyanide salts) | Poor (cyanide salts) |
| Suitable Materials | Alloy steels, tool steels | Stainless steels, alloy steels | Carbon steels, cast iron | Carbon steels, cast iron |
| Typical Applications | Gears, shafts | Precision molds, medical devices | Fasteners, small parts | Cutting tools, wear parts |
| Main Advantages | Mature process, low cost | Minimal distortion, high efficiency | Short cycle time | Simple equipment |
| Main Disadvantages | Long duration, high energy consumption | Expensive equipment | Environmental pollution | Environmental pollution |
Additional Notes
- Plasma nitriding is particularly suitable for stainless steel molds as it can break through the passive surface layer
- For hot work tool steels like H13, plasma nitriding is recommended, achieving surface hardness of 1000-1200HV
- Precision injection molds should preferably use plasma nitriding, with distortion controllable within 0.02mm
- Salt bath/liquid nitriding are being phased out in developed regions due to environmental concerns
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