Henan Yizhi Machinery Co., Ltd
Focus on transmission parts and drive your mechanical system better
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1) Description of Girth Gear
Girth gears are used in a number of the world’s critical industries, including mining, cement and minerals.
Usually fitted to the outside of horizontal mills, rotary mills and kilns, girth gears provide the system’s primary
rotational drive and as such need to be robust, efficient and built to last.
2) Applications of Girth Gear
Girth gears are used in a number of mining, cement and minerals processing applications, including copper,
gold, silver, platinum and iron ore production where operational downtime is not an option.
3) Material of Girth Gear
Castings Steel
| Products | Girth Gears |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gears |
| Gear Teeth manufacturing | Gear Milling/Gear Hobbing |
| Gear Teeth Grinding | √ |
| Module (M) | 22 |
| 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 | |
