Rotary Kiln Spare Parts
Comprehensive range of heat-resistant steel spare parts for rotary cement kilns. From kiln guard plates and dipping tubes to supporting rollers and thrust rollers. 30+ years of casting expertise for FLSmidth, Polysius, KHD, Sinoma, and Chinese OEM designs
Rotary Kiln Spare Parts
Material Specifications & Selection Guide
| Component | Material Grade | Standard | Max Temp | Hardness (HBW) | Key Property | Typical OEM Compat. |
|---|---|---|---|---|---|---|
| Kiln Guard Plate | ZG40Cr25Ni20Si2 | GB/T 8492 | 1050 C | 180-240 | Excellent oxidation resistance | FLSmidth, Polysius, KHD |
| Kiln Guard Plate (Hot Zone) | ZG35Cr28Ni48 | GB/T 8492 | 1150 C | 180-240 | Superior creep strength | FLSmidth, Polysius, KHD |
| Kiln Guard Plate (Trans. Zone) | ZG40Cr28Ni16 | GB/T 8492 | 1050 C | 170-230 | Thermal shock resistance | Sinoma, CITIC HIC, Pengfei |
| Dip Tube / Inner Cylinder | ZG35Cr24Ni7SiN | GB/T 8492 | 1050 C | 170-220 | N-strengthened, high creep | FLSmidth, KHD, IKN |
| Lifting Blade / Lifter | ZG30Cr26Ni5 | GB/T 8492 | 950 C | 170-220 | Cost-effective wear resistance | Sinoma, Pengfei, KHD |
| Burner Pipe / Nozzle | ZG35Ni35Cr26 | EN 10295 | 1100 C | 170-230 | Carburization resistant | FLSmidth, Pillard, Greco |
| Air Seal Ring | ZG40Cr25Ni12Si2 | GB/T 8492 | 1000 C | 180-230 | Balanced oxidation & wear | FLSmidth, Polysius, KHD |
| Component | Material Grade | Standard | Hardness (HBW) | Tensile (MPa) | Process | Typical Wt Range |
|---|---|---|---|---|---|---|
| Supporting Roller | 42CrMo / ZG42CrMo | GB/T 3077 / JB/T 6396 | 280-320 | 1080 | Forged / Cast + QT | 5,000-120,000 kg |
| Kiln Tyre / Riding Ring | ZG35CrMo / ZG42CrMo | JB/T 6396 | 220-280 | 650-800 | Cast + Normalized | 8,000-150,000 kg |
| Thrust Roller | 42CrMo / 40CrNiMo | GB/T 3077 | 300-360 | 1080 | Forged + QT | 500-5,000 kg |
| Girth Gear / Ring Gear | ZG35CrMo / ZG42CrMo | JB/T 6396 | 220-280 | 650-800 | Cast + Normalized | 5,000-60,000 kg |
| Kiln Shell Section | Q345R / 16Mn / A516 Gr.70 | GB 713 / ASME SA516 | 140-190 | 470-630 | Hot-rolled Plate | Per design |
| Pinion Shaft | 42CrMo / 40CrNi2Mo | GB/T 3077 | 300-360 | 1080 | Forged + QT + Machined | 100-3,000 kg |
| Bearing Housing | ZG270-500 / ZG35CrMo | GB/T 11352 / JB/T 6396 | 160-220 | 500-650 | Cast + Annealed | 500-8,000 kg |
| OEM | Kiln Series / Model | Guard Plate Compat. | Roller Compat. | Tyre Compat. | Girth Gear Compat. | Lead Time |
|---|---|---|---|---|---|---|
| FLSmidth | SLC-D / ILC / SLC | Yes | Yes | Yes | Yes | 15-25 Days |
| Polysius / ThyssenKrupp | Prepol-AS / Dopol | Yes | Yes | Yes | Yes | 15-25 Days |
| KHD Humboldt Wedag | Pyroclon / Pyrorapid | Yes | Yes | Yes | On Request | 15-25 Days |
| Sinoma / CBMI | NSP 2500-10000 t/d | Yes | Yes | Yes | Yes | 15-20 Days |
| CITIC HIC | Various 1500-8000 t/d | Yes | Yes | Yes | Yes | 15-20 Days |
| Jiangsu Pengfei | PF 1500-10000 t/d | Yes | Yes | Yes | Yes | 15-20 Days |
Selection Quick Reference
- Burning zone internals (1100-1400 C clinker, 1050-1150 C gas): ZG35Cr28Ni48 guard plates + ZG35Ni35Cr26 burner nozzles for maximum life under extreme thermal and chemical conditions
- Transition zone internals (900-1050 C): ZG40Cr25Ni20Si2 guard plates + ZG35Cr24Ni7SiN dip tubes, balanced oxidation resistance and cost
- Kiln support system (ambient to 300 C): 42CrMo forged rollers and tyres, heat-treated to 280-360 HBW for maximum contact fatigue life
- Structural / shell components: Q345R / 16Mn / A516 Gr.70 boiler-quality steel plate, ultrasonic tested, available in thicknesses from 20 mm to 120 mm
- All internal castings are ISO 9001:2015 certified. External structural components include EN 10204 3.1 material certificates and UT reports
- Reverse engineering available for all OEM designs. Send part numbers, drawings, or worn samples for quotation
Certifications & Authorizations
Quality you can verify. Partners you can trust.
Custom OEM / ODM
From drawing to delivery — one-stop customization, no minimum order
Send Drawing
Upload your technical drawing (PDF, DWG, STEP, IGES) or share sample photos with dimensions
Engineering Review
Material recommendation, casting process design, DFM analysis — free quotation within 24 hours
Sampling & Test
Prototype production with full inspection: hardness test, spectrometer, dimensional check
Production & Ship
ISO 9001 certified. 15-25 days standard lead time. Global shipping with full documentation
Frequently Asked Questions
ZHILI is a full-scope rotary kiln spare parts manufacturer covering both internal heat-resistant components and external structural parts. With 30+ years of casting and machining experience, we produce:
- Hot zone internals (cast): Kiln guard plates, dip tubes, inner cylinders, lifting blades, air seal rings, burner pipe nozzles — manufactured in heat-resistant steel grades (ZG40Cr25Ni20Si2, ZG35Cr28Ni48, etc.) using lost-foam and precision casting.
- Support system (forged/cast): Supporting rollers, thrust rollers, kiln tyres (riding rings), pinion shafts, and girth gears — manufactured from 42CrMo, ZG42CrMo, ZG35CrMo in weights up to 150,000 kg per piece.
- Structural & wear parts: Kiln shell sections (Q345R / A516 Gr.70 up to 120 mm thick), bearing housings, inlet/outlet seals, and refractory anchors.
Reverse engineering: We maintain a database of 2,000+ kiln component specifications. If your kiln is older and original drawings are unavailable, send us the worn part — our metrology lab will 3D laser scan and reverse-engineer a perfect replacement.
Rotary kiln components have predictable wear patterns based on location and operating conditions. Here are the key inspection criteria and replacement triggers for the most common parts:
Inspection checklist by component:
- Kiln guard plates: Use ultrasonic thickness gauge at 6-8 measurement points per plate. Replace when remaining thickness falls below 50% of original. Also check bolt tightness — loose bolts cause vibration and accelerated wear.
- Supporting rollers: Measure roller diameter at 3 axial positions (left, center, right). Replace when diameter loss exceeds 5% (roller body) or when surface spalling exceeds 20% of contact area. Check axial float monthly.
- Kiln tyres (riding rings): Ultrasonic test for sub-surface cracks annually. Any surface crack visible to naked eye requires immediate engineering assessment. Check creep gap between tyre and shell quarterly.
- Girth gear: Measure tooth thickness at 4 positions around the gear. Replace when tooth thinning exceeds 25% of original profile. Check backlash quarterly — increased backlash >2x original indicates excessive wear.
Effective kiln maintenance planning requires matching spare parts lead times with shutdown windows. Kiln stops cost USD 50,000-200,000 per day in lost production — having the right spares on hand is critical.
Recommended inventory strategy:
- Always in stock (critical spares): One full set of kiln guard plates per burning zone section, one set of inlet/outlet seal rings, one complete burner pipe nozzle. These are the highest-wear components with the shortest replacement window.
- Planned order (annual shutdown spares): Dip tubes, inner cylinders, lifting blades — order 30 days before the annual shutdown. These are inspected during shutdown and replaced as needed.
- Long-lead items (3-5 year replacement): Supporting rollers, thrust rollers, and girth gears have 5-15 year service life. Place replacement orders 3-4 months in advance of the planned shutdown.
- Kiln tyres: 15-25 year service life. When tyres approach minimum thickness, plan replacement 6 months ahead. Kiln tyres are the longest-lead item weighing up to 150 tonnes.
Emergency service: Rush orders for cast internals can be shipped in 7-10 days for premium rates. For forged components, we stock 42CrMo billet to reduce emergency lead time to 20-25 days. Contact our 24/7 service line for urgent requirements.
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