Henan Yizhi Machinery Co., Ltd
Focus on transmission parts and drive your mechanical system better
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25 Module Casting Steel Custom Made Girth Gears For Ball Mill of Cement Plants
1) Description of Girth Gear
a) Girth gears are manufactured from alloy steel castings with a capacity of up to 150 tons or Ø12.5m per gear set
b) We manufacture pinions and gearbox internals from through-hardened or case-hardened alloy steel forgings
c) Gear tooth and root areas are subjected to grinding if necessary, ensuring a high degree of accuracy in gear manufacture
d) An in-board testing head enables the production of gear quality inspection graphs to verify tooth profile, lead, pitch,
run out and span values and deviations.
| Products | Girth Gears |
| Custom Made | √ |
| Gear Profile Type | Cylindrical Gears |
| Manufacturing | Gear Milling/Gear Hobbing |
| Teeth Grinding | |
| Module (M) | 25 |
| Number of Teeth (Z) | Custom |
| Pressure Angle (α) | 20° |
| Lead Angle | 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 | |
