Preheater Spare Part
Heat-resistant steel preheater components for cement plant suspension preheaters. Includes cyclone cones, dip tubes, spreader plates, and volutes. Manufactured with ZG35Cr24Ni7SiN and ZG30Cr26Ni5 alloy for 1000-1100 C service.
Preheater Spare Part
Material Specifications & Selection Guide
| Grade | Standard | Max Temp | Key Feature | Application |
|---|---|---|---|---|
| ZG35Cr24Ni7SiN | GB/T 8492 | 1050 C | Nitrogen-strengthened, high creep resistance | Cyclone cones, volutes, dip tubes |
| ZG30Cr26Ni5 | GB/T 8492 | 1000 C | Good thermal shock resistance, cost-effective | Meal pipes, lower stage dip tubes |
| ZG40Cr25Ni12Si2 | GB/T 8492 | 1050 C | Excellent oxidation resistance | Spreader plates, internal components |
| ZG30Cr20Ni10 | GB/T 8492 | 900 C | Economical, general heat resistance | Casing segments, lower temp parts |
| ZG35Ni24Cr18Si2 | EN 10295 | 1050 C | Superior carburization resistance | High-temp dip tubes, meal distributors |
| Grade | C (%) | Cr (%) | Ni (%) | Si (%) | Mn (%) | N (%) | P/S Max |
|---|---|---|---|---|---|---|---|
| ZG35Cr24Ni7SiN | 0.30-0.40 | 23.0-26.0 | 6.0-8.0 | 1.30-2.00 | 0.50-1.50 | 0.15-0.25 | 0.040 |
| ZG30Cr26Ni5 | 0.25-0.35 | 24.0-28.0 | 4.0-6.0 | 1.00-2.00 | 0.50-1.50 | – | 0.040 |
| ZG40Cr25Ni12Si2 | 0.35-0.45 | 24.0-27.0 | 11.0-14.0 | 1.50-2.50 | 0.50-1.50 | – | 0.040 |
| ZG30Cr20Ni10 | 0.25-0.35 | 18.0-22.0 | 8.0-12.0 | 1.00-2.00 | 0.50-1.50 | – | 0.040 |
| Grade | Tensile (MPa) | Yield (MPa) | Elong. (%) | Hardness (HBW) | Density |
|---|---|---|---|---|---|
| ZG35Cr24Ni7SiN | 480 | 245 | 8 | 170-220 | 7.75 |
| ZG30Cr26Ni5 | 450 | 235 | 10 | 170-220 | 7.80 |
| ZG40Cr25Ni12Si2 | 440 | 220 | 6 | 180-230 | 7.70 |
| ZG30Cr20Ni10 | 400 | 200 | 8 | 160-210 | 7.85 |
Selection Quick Reference
- Cyclone cones & volutes: ZG35Cr24Ni7SiN – nitrogen-strengthened for superior creep resistance at 1050 C
- Dip tubes & meal pipes: ZG30Cr26Ni5 – balanced thermal shock resistance, most cost-effective option
- Spreader plates: ZG40Cr25Ni12Si2 – high oxidation resistance for material impact zones
- Lower stage components: ZG30Cr20Ni10 – economical solution for <900 C zones
- All grades compatible with FLSmidth, KHD, Polysius, Sinoma, IKN, Tianjin preheater designs
Certifications & Authorizations
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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
Unlike static castings, preheater components operate in high-temperature, high-velocity gas streams with abrasive raw meal particles. The typical service life varies significantly based on the component location and operating conditions:
Three main failure modes:
- Thermal fatigue cracking: Repeated heating/cooling cycles cause surface cracking. ZG35Cr24Ni7SiN with nitrogen strengthening reduces thermal fatigue by 40-50% vs standard grades.
- Abraisve erosion: High-velocity raw meal particles cause gradual wall thinning. Higher hardness grades (ZG40Cr25Ni12Si2) offer better erosion resistance.
- Carburization attack: In reducing zones, carbon diffusion causes embrittlement. ZG35Ni24Cr18Si2 provides superior carburization resistance for problematic areas.
Installation tip: Ensure proper expansion gap design and avoid mechanical stress during installation. Thermal expansion of heat-resistant steel is approximately 1.3% at 1000 C.
Material selection depends on operating temperature, gas composition, and particle velocity. Here’s our recommended grade mapping based on preheater stage and conditions:
- Top stages (cooler zones): ZG30Cr20Ni10 offers cost-effective performance for temperatures below 900 C. Good for casing segments and cooler zone components.
- Mid stages: ZG30Cr26Ni5 provides the best balance of thermal shock resistance and cost. Ideal for meal pipes and standard dip tubes.
- Hot zone (Stage 5, calciner): ZG35Cr24Ni7SiN with nitrogen addition delivers superior creep resistance at 1000-1050 C. Essential for cyclone cones and hot dip tubes.
- Reducing atmosphere zones: ZG35Ni24Cr18Si2 resists carburization in areas with incomplete combustion or CO-rich gas.
Still unsure? Send us your operating parameters (temperature profile, gas analysis, fuel type) and our engineers will recommend the optimal grade.
Yes. ZHILI specializes in reverse engineering and custom manufacturing for all major preheater OEM designs including FLSmidth, KHD, Polysius, IKN, Sinoma, and Tianjin. We support three sourcing approaches:
- From your technical drawings: Submit CAD drawings (PDF, DWG, STEP) with material specifications and we manufacture to exact tolerances.
- From worn samples: Send us your used components. Our metrology lab performs 3D laser scanning and reverse engineering to recreate accurate drawings and cast new parts.
- From OEM part numbers: Provide the original manufacturer part number and we cross-reference to our database of 2,000+ preheater component specifications.
Design optimization: We can suggest material upgrades or design modifications to extend service life based on your failure history. Our engineering team has 30+ years of cement plant experience.
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