 |
| Quantity: | |
|---|---|
|
| |
4047166
YASSIAN or Your's
The characteristics of nitrided steel as edge tooth material
Nitrided steel, as a material for the edge teeth of construction machinery, has core characteristics reflected in surface hardening and thermal stability, especially suitable for high-precision, high-temperature and corrosive working conditions. The specific characteristics are as follows:
1. Ultra-high hardness and wear resistance of the surface layer
The surface hardness reaches HV 850-1200 (equivalent to HRC 65-72), which is much higher than that of carburized steel (HRC 58-62) .
The ε phase compound layer (white bright layer) is formed through nitriding treatment, and the wear resistance is increased by more than three times , and it still maintains high hardness at 500℃ high temperature.
Comparative case : the hardness of 38CrMoAlA steel after nitriding is > 920HV , suitable for precision transmission components with relatively small impact loads .
️ 2. Fatigue resistance and dimensional stability of
Anti-fatigue strengthening :
The residual compressive stress in the nitrided layer increases the fatigue limit by 15%-35% and reduces the crack sensitivity under alternating loads by .
Micro-deformation property :
The low-temperature nitriding process (500-520℃) has a deformation rate of ≤0.02%, ensuring high-precision gear assembly (for example, the precision of 7-6 grade gears only drops by 1-2 grades after nitriding) .
Corrosion resistance :
The dense structure of the ε phase layer can resist corrosion by water vapor and alkaline media, replacing the traditional galvanizing process .
️ III. Limitations of and adaptability to working conditions
Features Advantage scenarios Limitations and risks
Impact resistance good low-temperature toughness (suitable for -20℃ environment) aluminum-containing nitrided steel (such as 38CrMoAl) is relatively brittle and prone to cracking under heavy impact
The depth of the diffusion layer for precision transmission parts (layer depth 0.3-0.6mm) the diffusion layer of traditional process is less than 0.4mm, and the contact fatigue strength is lower than that of carburized steel
Economic efficiency eliminates the cost of post-grinding treatment. The deep nitriding (> 0.6mm) process is time-consuming and costly
Breakthrough direction : New age-hardening steels (such as 1.8509) combined with deep nitriding technology can simultaneously enhance the core hardness (42-46 HRC) and the strength of the nitrided layer .
️ IV. Technical specifications for selection
markdown
Copy Code
# Core Parameters of Nitrided steel edge teeth
- ‌ ** Applicable grades **‌ : 38CrMoAlA (light impact), 34CrAlNi7 (high corrosion resistance), 1.8509 (high fatigue strength) :ml-citation{ref="1,5" data="citationList"}
- ‌ ** Pretreatment Requirements **‌" Quenched and tempered hardness ≥260 HB (e.g. 262-302 HB) :ml-citation{ref="2" data="citationList"}
- ‌ ** Deep nitride layer **‌ Precision parts ≥0.3mm, heavy-duty parts ≥0.6mm (deep process) :ml-citation{ref="5" data="citationList"}
- ‌ ** Surface roughness **‌" : ≤Ra 0.2 μm (reduces gluing risk) :ml-citation{ref="4" data="citationList"}
summary: The core value of nitrided steel
Irreplaceable scenarios : high-temperature operations (> 300℃), corrosive environments, high-precision no-grinding gears;
Scenarios to be cautious about : ultra-high impact conditions such as ore crushing (carburized steel is preferred) .
Nitrided steel achieves dual breakthroughs in service life and precision under specific working conditions through its "super-hard surface + micro-deformation" characteristics.
The characteristics of nitrided steel as edge tooth material
Nitrided steel, as a material for the edge teeth of construction machinery, has core characteristics reflected in surface hardening and thermal stability, especially suitable for high-precision, high-temperature and corrosive working conditions. The specific characteristics are as follows:
1. Ultra-high hardness and wear resistance of the surface layer
The surface hardness reaches HV 850-1200 (equivalent to HRC 65-72), which is much higher than that of carburized steel (HRC 58-62) .
The ε phase compound layer (white bright layer) is formed through nitriding treatment, and the wear resistance is increased by more than three times , and it still maintains high hardness at 500℃ high temperature.
Comparative case : the hardness of 38CrMoAlA steel after nitriding is > 920HV , suitable for precision transmission components with relatively small impact loads .
️ 2. Fatigue resistance and dimensional stability of
Anti-fatigue strengthening :
The residual compressive stress in the nitrided layer increases the fatigue limit by 15%-35% and reduces the crack sensitivity under alternating loads by .
Micro-deformation property :
The low-temperature nitriding process (500-520℃) has a deformation rate of ≤0.02%, ensuring high-precision gear assembly (for example, the precision of 7-6 grade gears only drops by 1-2 grades after nitriding) .
Corrosion resistance :
The dense structure of the ε phase layer can resist corrosion by water vapor and alkaline media, replacing the traditional galvanizing process .
️ III. Limitations of and adaptability to working conditions
Features Advantage scenarios Limitations and risks
Impact resistance good low-temperature toughness (suitable for -20℃ environment) aluminum-containing nitrided steel (such as 38CrMoAl) is relatively brittle and prone to cracking under heavy impact
The depth of the diffusion layer for precision transmission parts (layer depth 0.3-0.6mm) the diffusion layer of traditional process is less than 0.4mm, and the contact fatigue strength is lower than that of carburized steel
Economic efficiency eliminates the cost of post-grinding treatment. The deep nitriding (> 0.6mm) process is time-consuming and costly
Breakthrough direction : New age-hardening steels (such as 1.8509) combined with deep nitriding technology can simultaneously enhance the core hardness (42-46 HRC) and the strength of the nitrided layer .
️ IV. Technical specifications for selection
markdown
Copy Code
# Core Parameters of Nitrided steel edge teeth
- ‌ ** Applicable grades **‌ : 38CrMoAlA (light impact), 34CrAlNi7 (high corrosion resistance), 1.8509 (high fatigue strength) :ml-citation{ref="1,5" data="citationList"}
- ‌ ** Pretreatment Requirements **‌" Quenched and tempered hardness ≥260 HB (e.g. 262-302 HB) :ml-citation{ref="2" data="citationList"}
- ‌ ** Deep nitride layer **‌ Precision parts ≥0.3mm, heavy-duty parts ≥0.6mm (deep process) :ml-citation{ref="5" data="citationList"}
- ‌ ** Surface roughness **‌" : ≤Ra 0.2 μm (reduces gluing risk) :ml-citation{ref="4" data="citationList"}
summary: The core value of nitrided steel
Irreplaceable scenarios : high-temperature operations (> 300℃), corrosive environments, high-precision no-grinding gears;
Scenarios to be cautious about : ultra-high impact conditions such as ore crushing (carburized steel is preferred) .
Nitrided steel achieves dual breakthroughs in service life and precision under specific working conditions through its "super-hard surface + micro-deformation" characteristics.
