Cooling Grate / Grate Cooler Plate
Heat-resistant steel grate plates for cement plant clinker coolers. Designed for high-temperature clinker transport (up to 1400 C inlet) with optimized air flow channels. Compatible with FLSmidth, IKN, KHD, Sinoma grate cooler systems
Cooling Grate / Grate Cooler Plate
Material Specifications & Selection Guide
| Grade | Standard | Max Temp | Plate Type | Key Feature | Application |
|---|---|---|---|---|---|
| ZG40Cr25Ni20Si2 | GB/T 8492 | 1050 C | Fixed + Movable | Excellent oxidation & wear resistance, highest Ni | Hot zone inlet rows 1-5, clinker discharge |
| ZG35Cr24Ni7SiN | GB/T 8492 | 1050 C | Fixed + Movable | N-strengthened, best thermal fatigue resistance | Mid-cooler rows 6-12, severe thermal cycling |
| ZG30Cr26Ni5 | GB/T 8492 | 950 C | Movable | Good thermal shock, economical | Rear zone rows 13+, lower temperature |
| ZG40Cr25Ni12Si2 | GB/T 8492 | 1000 C | Fixed | Balanced performance, dimensional stability | Transition zone, side row plates |
| ZG30Cr20Ni10 | GB/T 8492 | 900 C | Movable | Most economical, adequate for cool zones | End zone rows, ambient-temp sections |
| Grade | C (%) | Cr (%) | Ni (%) | Si (%) | Mn (%) | N (%) | P/S Max |
|---|---|---|---|---|---|---|---|
| ZG40Cr25Ni20Si2 | 0.35-0.45 | 24.0-27.0 | 19.0-22.0 | 1.50-2.50 | 0.50-1.50 | – | 0.040 |
| 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 |
| Plate Type | Typical Dimensions (mm) | Weight per Plate | Slot Pattern | Air Flow Direction | Compatible OEM Coolers |
|---|---|---|---|---|---|
| Fixed Grate (Hot Zone) | 300 x 250 x 40-50 | 12-25 kg | Slotted (3-5 mm gap) | Vertical upward | FLSmidth, IKN, KHD, Sinoma |
| Fixed Grate (Mid Zone) | 300 x 300 x 35-45 | 10-20 kg | Slotted (5-8 mm gap) | Vertical upward | FLSmidth, IKN, KHD, Sinoma |
| Movable Grate (All Zones) | 300 x 250 x 35-50 | 12-25 kg | Slotted / Louvered | Inclined (30-45 ) | FLSmidth, IKN, KHD, Sinoma |
| Side Seal Plate | 250 x 100 x 25-35 | 5-10 kg | Plain / Ribbed | N/A (sealing) | All OEM designs |
| End Row Plate | 300 x 200 x 30-40 | 8-15 kg | Slotted (8-10 mm gap) | Vertical upward | FLSmidth, IKN, Sinoma |
Selection Quick Reference
- Hot zone fixed grates (rows 1-5, 900-1100 C): ZG40Cr25Ni20Si2 — highest Ni content (20%) for maximum oxidation resistance and dimensional stability where clinker is hottest
- Mid-cooler grates (rows 6-12, 700-950 C): ZG35Cr24Ni7SiN — nitrogen-strengthened to resist thermal fatigue cracking from rapid cooling air, 40% longer life than standard grades in cycling zones
- Rear zone grates (rows 13+, 300-700 C): ZG30Cr26Ni5 — cost-effective with good wear resistance, 18-36 month service life in cooler zones
- Fixed vs movable: Fixed plates experience only thermal stress. Movable plates have additional mechanical wear from reciprocating motion — consider upgrading to the next higher grade for movable applications
- All plates precision-cast with air slot gap tolerance of +/- 0.5 mm. Slot gap is critical for proper air distribution and cooling efficiency
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
Grate coolers use an alternating fixed and movable plate design to transport clinker while cooling it with forced air. Each plate type has distinct wear characteristics and replacement triggers:
Fixed plates: Experience thermal stress and clinker abrasion only. Hot clinker sits directly on these plates. Key failure sign: through-wall burning (hole formation) and slot edge erosion widening air gaps beyond 10 mm.
Movable plates: Experience thermal stress + mechanical wear + friction. The reciprocating motion (120-150 mm stroke, 10-20 cycles/min) causes sliding wear on the underside against the support beam. Key failure signs: mounting lug cracking, excessive movement clearance (>5 mm gap between plate and beam), and underside gouging.
Inspection tip: Movable plates wear 15-25% faster than fixed plates in the same row. Order 10-15% extra movable plates when stocking spares to account for the higher replacement rate.
The air slot design is critical to cooler efficiency. It must balance three competing requirements: maximum airflow for cooling, minimum clinker fall-through, and structural integrity of the plate. ZHILI offers several slot patterns optimized for different cooler zones:
- Narrow straight slots (3-5 mm): For hot zone fixed plates where clinker is still plastic/sticky. Narrow gaps prevent liquid-phase clinker from penetrating while maintaining high air velocity. Air velocity through slots: 40-60 m/s.
- Wide straight slots (5-8 mm): For mid-zone plates where clinker has solidified. Higher airflow volume for maximum heat recovery. Reduced clogging risk from fine particles.
- Louvered / angled slots (30-45 degrees): For movable plates. The angled design directs cooling air against clinker flow direction, improving heat transfer efficiency by 15-20% compared to vertical slots.
Performance tip: Wider slots increase airflow but reduce plate life due to reduced cross-sectional area. For every 1 mm increase in slot width, expect 5-8% reduction in grate plate service life. Balance cooling needs with spare parts cost.
Many older cement plants operate coolers where original drawings are lost or the OEM no longer supports the model. ZHILI specializes in reverse-engineering grate plates from minimal information:
Minimum information needed for quotation:
- Plate dimensions: Length x width x thickness in millimeters. Include bolt hole count, spacing, and diameter. A smartphone photo with a ruler placed on the plate works perfectly.
- Cooler type confirmation: Is it a cross-bar (FLSmidth), pendulum (IKN), or conventional reciprocating grate (KHD/Sinoma)? Even a photo of the cooler from outside helps identify the model.
- Row position: Which row number? Hot zone is rows 1-5, mid is 6-12, rear is 13+. This determines material grade selection.
Free sample evaluation: Send us one worn grate plate via courier. We will 3D scan it, produce a CAD drawing, manufacture one sample plate, and ship it back with the drawing for your approval — all before proceeding with the full order. This eliminates the risk of ordering incorrect parts.
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