The rotary kiln shell is made of steel plate, which has refractory liner inlaid inside. And the rotary kiln shell is supported by 3 kiln tyres that on each support roller device.
The kiln tyre which installed on the feeding head of rotary kiln will be fixed on a large girth gear, and the pinion will be installed under it and meshed together.
 
The girth gear is an important steel casting spare parts for rotary kiln that requires to meet the high strength, good wear resistance quality and high fatigue resistance. The large girth gear materials in China mainly as below:

• ZG35CrMo

1. Composition:：（C）0.32%-0.40%，（Cr）0.80%-1.10%，（Mo）0.15%-0.25%
2. Features: high strength, good wear resistance and fatigue resistance
3. Application: widely used in the manufacture of large ring gears in China.

• ZG42CrMo

1. Composition：（C）0.38%-0.45%，（Cr）0.90%-1.20%，（Mo）0.15%-0.25%
2. Features: ZG42CrMo has higher strength and wear resistance than ZG35CrMo, which suitable for large rotary kilns.
3. Applicaiton: high-load and high speed rotary kilns.

The large gear rings materials in International mainly as belows:

• ASTM A148 Grade 90-60

1. Composition：（C）0.25%-0.35%，（Mn）0.60%-0.90%，（Cr）0.80%-1.10%
2. Features: high strength, good toughness and wear resistance
3. Application: Unites States and European countries 

• EN 10083-3 34CrNiMo6

1. Composition:（C）0.30%-0.38%，（Cr）1.30%-1.70%，（Ni）1.30%-1.70%，（Mo）0.15%-0.30%
2. Features: high strength, excellent fatigue resistance and toughness
3. Application: Common used in European countries 

• JIS SCM440

1. Composition: （C）0.38%-0.43%，（Cr）0.90%-1.20%，（Mo）0.15%-0.30%
2. Features: high strength, excellent fatigue resistance and toughness
3. Application: Common used in Japan and Southeast Asian counties

As for the leading steel casting parts factory in China, Tenfaye can manufacture all kinds of materials and size girth gears for customer as drawings, your inquiry will be highly valued.