The kiln tyre is one of the most critical load-bearing components of a rotary kiln, supporting the full weight of the kiln shell and lining as it rotates. LIMING manufactures forged alloy steel riding rings engineered for decades of reliable service under extreme thermal and mechanical stress.
The kiln tyre — also known as the riding ring — is a massive steel ring that encircles the rotary kiln shell and rides on the support rollers. It transmits the entire weight of the rotating kiln (including shell, refractory lining, and material charge) to the support stations. Because the kiln rotates continuously at high temperature, the tyre must withstand enormous radial loads, thermal expansion stresses, and contact fatigue at the roller interface.
A poorly manufactured kiln tyre can lead to uneven shell movement, excessive roller wear, refractory damage, and ultimately catastrophic kiln failure. LIMING's kiln tyres are produced from high-grade forged alloy steel, precision-machined to exacting tolerances, and subjected to comprehensive non-destructive testing. Each riding ring is engineered to match your kiln's specific operating parameters — diameter, rotation speed, operating temperature, and load conditions.
We manufacture kiln tyres for all rotary kiln types used in cement production, lime calcination, activated carbon production, and mineral processing. Whether you need a replacement for an OEM kiln or a custom tyre for a modified installation, our engineering team can produce a riding ring that meets or exceeds the original specifications.
LIMING offers kiln tyres in three primary material grades, each selected based on the kiln's size, operating temperature, and load requirements:
| Material Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Hardness (HB) | Typical Application |
|---|---|---|---|---|
| ZG45 (Cast Carbon Steel) | ≥570 | ≥310 | 150-210 | Small to medium rotary kilns, moderate temperature |
| ZG35CrMo (Alloy Steel) | ≥590 | ≥390 | 180-240 | Medium to large kilns, elevated temperature service |
| ZG42CrMo (Chrome-Moly Alloy) | ≥690 | ≥490 | 200-270 | Large cement kilns, heavy-duty high-temperature applications |
For the most demanding applications — large-diameter cement kilns operating above 1200°C — we recommend ZG42CrMo for its superior creep resistance, hardenability, and toughness under thermal cycling. The chrome-molybdenum alloy provides excellent wear resistance at the roller contact surface and maintains mechanical properties at elevated temperatures.
Decades of experience manufacturing critical rotary kiln components for cement plants worldwide.
30,000-ton annual casting capacity with dedicated facilities for large-scale components. No middlemen — direct factory pricing.
Every tyre undergoes ultrasonic testing (UT) and magnetic particle inspection (MT). Full test certificates provided.
CNC turning and grinding ensure exact bore diameter, OD tolerance, and surface finish for optimal roller contact.
Experienced in shipping oversized components worldwide. Complete export documentation and logistics support included.
The following specifications are representative examples. All kiln tyres are manufactured to customer drawings or reverse-engineered from samples.
| Parameter | Specification |
|---|---|
| Product Type | Kiln Tyre / Riding Ring (solid or split design) |
| Material Options | ZG45, ZG35CrMo, ZG42CrMo (forged alloy steel) |
| Outer Diameter | 1,500 mm – 7,000+ mm (custom) |
| Inner Diameter (Bore) | Matched to kiln shell OD + expansion allowance |
| Face Width | 400 mm – 1,200 mm (per design) |
| Cross-Section | Rectangular, box-section, or custom profile |
| Unit Weight | 5 – 60+ tons per tyre |
| Surface Hardness | 150-270 HB (material dependent) |
| Manufacturing Standard | GB, ASTM, DIN, JIS — per customer requirement |
| Heat Treatment | Quench and temper, normalized + tempered |
| Inspection | UT (ultrasonic), MT (magnetic particle), dimensional CMM |
| Lead Time | 60-120 days (depending on size and quantity) |
From raw steel ingot to finished, inspected riding ring — every step controlled under our ISO 9001 quality system.
Steel melted and poured into custom sand molds designed for the specific tyre geometry.
Ring rolling or open-die forging refines grain structure and enhances mechanical properties.
Quench and temper or normalize to achieve target hardness, strength, and toughness.
CNC turning and grinding to exact bore, OD, and face width tolerances.
UT, MT, hardness testing, and dimensional CMM verification before shipment.
Every kiln tyre produced by LIMING undergoes a multi-stage quality control protocol that begins with raw material verification and concludes with final dimensional inspection. Our metallurgical laboratory performs chemical analysis (spectrometer) and mechanical property testing (tensile, impact, hardness) on every heat.
Non-destructive testing is mandatory for all kiln tyres regardless of size:
Full mill test certificates (MTC) including chemical composition, mechanical properties, and NDT reports are provided with every shipment.