Heat-resistant Furnace Grate Bars

What are Heat-resistant furnace grate bars? Heat-resistant furnace grate bars are a category of special metal materials that maintain structural stability under long-term high-temperature conditions (500–1200℃), cyclic heating and cooling, and flue gas corrosion. The core requirements are...

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Product Introduction

What are Heat-resistant furnace grate bars?

Heat-resistant furnace grate bars are a category of special metal materials that maintain structural stability under long-term high-temperature conditions (500–1200℃), cyclic heating and cooling, and flue gas corrosion. The core requirements are high-temperature oxidation resistance, thermal shock deformation resistance, and corrosion resistance.

Different materials are suitable for various fireplace types (residential fireplaces, industrial fireplaces, biomass fireplaces, etc.).

Requirements for Heat-resistant furnace grate bars

Requirements for Heat-Resistant Metals for Fireplaces

High-temperature oxidation resistance: Forms a dense oxide film on the surface when exposed to open flames, preventing continuous corrosion of the metal matrix.

Thermal shock resistance: Withstands repeated cycles of "high temperature during ignition - cooling after flameout" without cracking or deformation.

Structural strength: Supports the furnace body and bears fuel loads without zsoftening or collapsing under long-term high temperatures.

Corrosion resistance: Resists erosion by acidic substances (e.g., sulfur oxides) in flue gas, extending service life.

Material Selection Recommendations for Different Fireplace Components

Product Center

Inner Liner/Combustion Chamber: Prioritize 310S stainless steel or Cr25Ni20 alloy. Directly exposed to open flames, these require excellent oxidation and thermal shock resistance.

Grate/Fuel Support: Select high-chromium-nickel alloy castings (e.g., ZG40Cr25Ni20Si2). These need to satisfy both high-temperature resistance and wear resistance (to withstand fuel friction).

Flue/Exhaust Pipe: Choose 309S stainless steel. Operating at temperatures slightly lower than the combustion chamber, it emphasizes corrosion resistance and welding tightness.

Fireplace Door/Outer Decorative Parts: Use heat-resistant cast iron or ordinary stainless steel. These components work at relatively low temperatures, balancing cost and aesthetics.

The Heat-resistant furnace grate bars we produce can withstand temperatures up to 1800℃ and will not d heat-resistant metal accessorieseform or rust even after years of cyclic heating and cooling.

Do you need components suitable for different fireplace types (wood-burning, biomass, industrial)? We can customize samples according to your drawings with no minimum order quantity (MOQ) requirement

About Us

Core strengths

Choose the plan that suits you best.

Self-constructed closed loop of industrial integration

Tengzhou Tiangong Machinery Co., Ltd. is a professional precision casting manufacturer equipped with product R&D capability, quality assurance system, and batch production capacity.

Powerful Brand Influence

Our facility has a full suite of physical & chemical testing equipment, including imported German spectrometers, U.S.-standard mechanical property testers, plus top domestic impact & hardness testers.

25 Years of Deep Technology Accumulation

Founded in June 2004, we are located in Nilou Industrial Park, Guanqiao Town, Tengzhou City, Shandong Province.

Our Product Processes

Our casting processes include water glass/silica sol precision casting and coated sand shell molding. With 10+ years of experience, we cast carbon/alloy/stainless/heat-resistant steel, boasting 2,000t annual precision casting capacity and 3,000t coated sand casting capacity. Our products serve machinery and chemical industries with great market potential.

What distinguishes us from other manufacturers?

We are a direct source factory specializing in heat-resistant metal accessories for fireplaces, with years of focused R&D and manufacturing experience. Choosing us means partnering with a supplier that truly understands the high-temperature, thermal shock, and corrosion challenges of fireplace applications. Here are our core strengths:

As a middleman-free source factory, we cut out unnecessary markup, offering competitive factory prices that save you 10–20% of procurement costs. We support full OEM/ODM customization - whether you need custom-sized inner liners, heavy-duty alloy grates, flue connectors, or combustion chamber brackets, we can tailor every detail to your requirements. MOQs for trial orders are negotiable, making it easy to test our quality.

We don't use generic metals - our products are crafted from fireplace-specific heat-resistant materials, including 310S stainless steel (max temp 1150℃), Cr25Ni20 high-chromium-nickel alloy, and customized high-performance grades. All materials comply with ASTM/DIN/EN international standards, delivering exceptional oxidation resistance, thermal shock resistance, and structural stability. Our accessories last 30% longer than ordinary alternatives, even under cyclic heating and cooling of wood-burning or biomass fireplaces.

We are proud to have established proven partnerships with enterprises across more than ten countries worldwide. Furthermore, our heat-resistant metal accessories for fireplaces have earned high recognition in global markets for their superior durability and performance.