Henan Yizhi Machinery Co., Ltd
Focus on transmission parts and drive your mechanical system better
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1) Description of Girth Gear
As a principle structural and mechanical component, the girth gear on a rotary drum has widespread effects
when allowed to wear. As a result, gear wear should be addressed immediately, typically through replacement,
though in cases of onset wear, simple adjustments may prevent further damage.
2) Heat Treatment of Girth Gear
Gears are flame or induction hardened to achieve a desirable hardness. Hardness of the girth and pinion
gears plays an essential role in maximizing equipment life.
3) Material of Girth Gear
Castings Steel/ ZG 42CrMo (AISI 4140) or ZG40CrNiMo (AISI 4340)
| Products | Girth Gears |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gears |
| Gear Teeth manufacturing | Gear Milling/Gear Hobbing |
| Gear Teeth Grinding |
|
| Module (M) | Custom |
| Number of Teeth (Z) | Custom |
| Pressure Angle (α) | 20° |
| Helix Angle (β) | Custom |
| Teeth Accuracy Grade | ISO 8-9 Grade |
| Heat Treatment | Quenching & Tempering |
| Surface Hardness | 230-260 HB |
| STEEL CODE GRADES COMPARISON | |||||
| CHINA/GB | ISO | ГΟСТ | ASTM | JIS | DIN |
| 45 | C45E4 | 45 | 1045 | S45C | CK45 |
| 40Cr | 41Cr4 | 40X | 5140 | SCr440 | 41Cr4 |
| 20CrMo | 18CrMo4 | 20ХМ | 4118 | SCM22 | 25CrMo4 |
| 42CrMo | 42CrMo4 | 38XM | 4140 | SCM440 | 42CrMo4 |
| 20CrMnTi | 18XГT | SMK22 | |||
| 20Cr2Ni4 | 20X2H4A | ||||
| 20CrNiMo | 20CrNiMo2 | 20XHM | 8720 | SNCM220 | 21NiCrMo2 |
| 40CrNiMoA | 40XH2MA/ 40XHMA | 4340 | SNCM439 | 40NiCrMo6/ 36NiCrMo4 | |
| 20CrNi2Mo | 20NiCrMo7 | 20XH2MA | 4320 | SNCM420 | |
