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Product Description
High-Performance High Chrome Grate Solutions for Extreme Sintering Environments
High chrome grate bars are the cornerstone of the modern sintering process, functioning as a robust skeleton structure that supports mineral materials in high-temperature environments. At Shandong Jiujiu Machinery, we engineer these thermal-resistant components to enable hot air to pass through the material bed effectively, creating a stable and controlled combustion zone. Without high-integrity grate bars, the entire sintering strand would suffer from inconsistent heat distribution and mechanical failure, leading to massive production losses in iron and steel plants.
Advanced Metallurgy for Thermal Resilience
The operational demands on a sintering machine are among the most brutal in the metallurgy industry. These grates need to withstand high temperatures (800°C–1100°C), aggressive chemical corrosion from flue gases, and significant mechanical stress. To meet these challenges, our high chrome grate products are manufactured from specialized heat-resistant alloys, primarily high-chromium cast iron (Cr18 to Cr28).
By infusing the iron matrix with high levels of Chromium and Nickel, we ensure:
Oxidation Resistance: The formation of a dense, protective oxide film prevents the metal from "growing" or scaling at temperatures exceeding 1000°C.
Optimal Hardness: Our castings maintain a surface hardness of HRC 48–55, providing the necessary defense against the constant abrasive scrubbing of iron ore and sinter mix.
Structural Stability: High creep strength ensures that the bars do not "sag" or deform under the heavy weight of the material bed during long-term exposure to intense heat.
Functional Design and Airflow Optimization
Typically, the grates feature a wavy or concave-convex surface design to increase friction, prevent material slipping, and facilitate air distribution. This optimized geometry is key to enhancing sintering efficiency. The precision-cast air slots in our high chrome grate bars are designed to prevent clogging by ash or fines, ensuring a uniform upward or downward draft. This results in a higher-quality sinter with a more consistent mineral structure, directly improving the productivity of the blast furnace.
Maintenance Team FAQ
Q: How do your grate bars handle the corrosive effects of sulfur and chlorides?
A: We adjust the Nickel and Silicon content in our high-chrome alloys to provide an extra layer of protection against the acidic gases released during the sintering of low-grade ores.
Q: Can you produce custom dimensions for older sintering strands?
A: Yes. We use CNC pattern making and 3D scanning to ensure our replacement grates fit any legacy or modern sintering machine perfectly, including those from major global OEMs.
Q: What is the benefit of the "vacuum casting" process you use?
A: Vacuum-sealed molding eliminates internal gas porosity. This creates a much denser casting that is less likely to develop the microscopic cracks that lead to structural snapping under thermal shock.
Chemical composition % of high chromium cast iron
This product is a customized product and is produced according to customer drawings or samples.
Casting Process
Casting Process
Casting Process
Casting Process
Casting Process
Delivery site
Delivery site
Delivery site
Delivery site
Delivery site
Inspections & Certifications
Certifications
Certifications
Customer visits
Customer visits
Customer visits
Customer visits
Customer visits
Keywords
sinter machine grate bars
sinter machine grate bars
Contact Us
Telephone:+86-13792621099
Weifang Binhai New Area Sino-foreign Cooperation Industrial Park, about 260 meters west of the intersection of Hai 'an Road and Zhenhai Street
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CONTACT US
Telephone：+86-13792621099
Weifang Binhai New Area Sino-foreign Cooperation Industrial Park, about 260 meters west of the intersection of Hai 'an Road and Zhenhai Street
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