Heat Resistant Castings
Grate Bars for Sinter and Cooler Lines
Grate bars cycle between hot burden and cooling air thousands of times. What fails is almost never strength at temperature, it is thermal fatigue and section loss.
- Service normally under 1100 °C
- Cast to your existing bar drawing
- Composition verified and reported
- Batch quantities produced from held tooling
Product Overview
About This Programme
Grate bars carry the burden on sinter machines and cooling lines while air is drawn or blown through the bed. They are exposed to high temperature, to constant thermal cycling and to the abrasion of the material sitting on them.
Section design matters as much as the alloy. A bar with a thick, unrelieved section builds thermal stress between the hot face and the cool interior. Ribs and reliefs let the section move, which is why two bars in the same grade can have very different lives.
Key Benefits
Key Benefits
Why buyers move this part to us, in their words rather than ours.
Designed for thermal movement
We review the section design against the duty and flag geometry that will build thermal stress.
Alloy matched to position
Bars in the hottest zone can be quoted in a higher grade than those further down the line.
Reproducible batches
Composition and dimensions checked across the batch so bar life is predictable.
Application Scenarios
Application Scenarios
- Sinter machine grate bars
- Cooler grate bars
- Furnace hearth grate elements
- High temperature support castings
Who It Is For
Who It Is For
Steel and sinter plants
Replacing bars across a pallet car fleet on a maintenance cycle.
Cement and lime plants
Cooler and calciner side grate elements.
Equipment builders
Supplying bars as part of a grate line rebuild.
Problems It Solves
Problems It Solves
If one of these is happening on your plant, send us the part and the current life figures.
- Bars cracking from thermal fatigue after a few months
- Section loss closing the air gaps and reducing draught
- Bars that warp and jam in the pallet frame
- Mixed grades arriving in one delivery with different service lives
- No composition report, so alloy cuts go unnoticed until failure
Technical Features
Technical Features and Materials
Grades
GB 9437 RTCr and RQT series, GB/T 20878 06Cr25Ni20 and ZG40Cr25Ni20Si2, EN 10295 1.4777, 1.4837 and 1.4848.
Service temperature
Normally used under 1100 degrees Celsius.
Geometry
Cast to your drawing including air gap geometry and end fixing.
Verification
Spectrometer composition analysis and dimensional check per batch.
Manufacturing Process
Manufacturing Process
The moulding route is chosen for the part. It is confirmed in writing with the quotation, together with the tolerance class and the machining allowance.
| Process | Best Suited For | Tolerance | Piece Weight |
|---|---|---|---|
| Green sand process | Small and medium parts with low dimensional requirement | CT11–CT14 | 0.2–200 kg |
| Resin sand process | Medium and large parts with high dimensional requirement | CT10–CT11 | 100–3000 kg |
| Shell molding process | Small and medium parts with strict dimensional requirement | CT7–CT9 | ≤50 kg |
| Lost foam process | Small and medium parts with complex structure | CT7–CT9 | ≤100 kg |
| Vacuum process | Medium and large parts needing good surface roughness | CT7–CT9 | ≤10000 kg |
Quality Control
Quality Control and Certification
Inspection is planned at the stages where a problem is still cheap to fix.
- Chemical composition by optical emission and handheld spectrometer
- Hardness tested and reported on every batch
- Dimensions checked against your drawing or the master sample
- Non destructive testing by magnetic particle, penetrant or ultrasonic method where the drawing requires it
Certification documents are issued by the producing factory for the specific order. Ask for the certificate package that applies to your part before you place the order.
Customization
Customization Options
Material and grade
Any grade in the programme, or a grade you nominate with the local equivalent confirmed before production.
Geometry and fixing
Produced to your drawing or reverse engineered from a worn sample, including bolt and seat geometry.
Marking and packing
Part number marking, position marking for sets, and export packing agreed before production.
Use Guide
How to Order
STEP 01
Send the drawing or the worn part
A drawing, a 3D file, or photographs with overall dimensions and the machine details. Add the annual quantity.
STEP 02
Confirm material and construction
We propose the grade and, where relevant, the construction, and explain the trade off against your current part.
STEP 03
First article
Tooling is made and the first article is measured and tested before the batch is released.
STEP 04
Batch and inspection
Stage inspections during production and a final inspection to the agreed standard with the reports you need.
STEP 05
Packing and shipment
Export packing marked with your part numbers, with the shipping documents you require.
FAQ
Questions About Grate Bars for Sinter and Cooler Lines
How long should a grate bar last?
Can you match bars from a previous supplier?
Do you supply mixed grades on one order?
Is a composition report included?
What quantity do you normally produce?
Send the Part and We Will Quote It
Photographs of the worn part with dimensions and the machine details are usually enough to start. Our engineers reply with the material, the construction and a price.