Machinery's Handbook, 31st Edition
Bevel Gearing
2269
Typical Steels Used for Bevel Gear Applications Carburizing Steels
Purchase Specifications
SAE or AISI No.
Brinell Hard ness Number
ASTM Grain Size
Remarks
Type of Steel
Preliminary Heat Treatment
Low alloy—oil quench limited to thin sections
1024
Manganese
Normalize
Normalize— anneal
2512
Nickel Alloy
163–228 5–8 Aircraft quality
Normalize, then heat to 1450 ° F, cool in furnace. Reheat to 1170 ° F— cool in air
Used for maximum resistance to wear and fatigue
3310 3312X Nickel-Chromium
163–228 5–8
4028
Molybdenum Normalize
163–217
Low alloy
Good machining qualities. Well adapted to direct quench—gives tough core with minimum distortion
4615 4620 4815 4820 5120 8615 8620 8715 8720
Nickel-Molybdenum Normalize— 1700 ° F–1750 ° F 163–217 5–8
Nickel-Molybdenum Normalize
163–241 5–8 For aircraft and heavily loaded service
Chromium
Normalize
163–217 5–8
Chromium-Nickel- Molybdenum
Normalize— cool at hammer
163–217 5–8 Used as an alternate for 4620
Oil Hardening and Flame Hardening Steels
Free-cutting steel used for unhardened gears, oil-treated gears, and for gears to be surface hardened where stresses are low surface-hardened gears. Machine qualities of 4640 are superior to 4140, and it is the preferred steel for flame hardening Fair machining qualities. Used for surface hardened gears when 4640 is not available Used for heat-treated, oil-hardened, and Used as an alternate for 4640
Sulfurized free- cutting carbon steel
Normalize— heat-treated
179–228 255–269
5 or Coarser
1141
179–212
4140
For oil hardening, normalize— anneal
Chromium- MolybdenumNickel- Molybdenum
235–269 269–302 302–341 235–269 269–302 302–341
For surface hardening,
4640
Normalize, reheat, quench, and draw
Normalize— reheat, quench, and draw
Chromium- Vanadium
6145
8640 8739
Chromium-Nickel- Molybdenum Same as for 4640
Nitriding Steels
Normal hardness range for cutting is 20–28 RC (Rockwell C scale)
Nitralloy H & G Special Alloy
Anneal
163–192
Other steels with qualities equivalent to those listed in the table may also be used.
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