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Heat-resistant castings are specialized castings designed for the high-temperature, high-pressure, and highly corrosive environments of the coal chemical industry. Their core function is to maintain long-term stability under extreme operating conditions through optimized material composition and process. Heat-resistant castings are key components that ensure the long-term stable operation of high-temperature equipment. Their selection requires a comprehensive consideration of temperature, corrosion, load, and cost factors, achieving a balance between performance and cost-effectiveness through optimized material composition and process.
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Material |
Gray Iron Casting/Ductile Iron Casting/Steel castings |
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Process |
Sand casting/lost foam casting/investment casting + CNC machining |
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Casting Tolerance |
CT9-10 for Machine Molding Process, |
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Casting surface roughness |
Ra 12.5-25 um |
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Casting weight range |
0.5kg to 20 tons per piece |
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Casting Size |
As Requirement/As drawing |
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Machining surface roughness |
As Requirement |
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Surface treatment |
KTL (E-coating), Zinc plating, Mirror Polishing, Sand Blasting, Acid pickling, black oxide, Painting, Hot galvanizing, Powder coating, and Nickel plating. |
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Service available |
OEM & ODM |
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Quality control/Testing facility |
Sectrometer, tensile test machine, hardness test machine,metallographic microscope. 100% inspection |
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Application |
Train & railway, automobile& truck, construction machinery, forklift, agricultural machinery, shipbuilding, petroleum machinery,construction, valves and pumps, electric machine, hardware, power equipment, and so on. |
Exceptional Heat Resistance
Heat resistance makes these castings ideal for high-temperature applications. These castings are specifically engineered to retain structural integrity and mechanical qualities even when subjected to high temperatures. Let’s take a closer look at the major components of their outstanding heat resistance.
Increased Strength and Durability
One of the major advantages of heat-resistant castings is their improved durability and toughness, which distinguishes them from traditional materials in high-temperature applications. Let’s look at the important variables that contribute to their increased strength and durability.
Excellent Mechanical Properties
Heat-resistant castings are well-known for their superior mechanical qualities even at high temperatures. These characteristics considerably contribute to their practicality for high-temperature applications. Let’s look at the main reasons for their remarkable mechanical performance.
Silicon-Based Heat-Resistant Cast Iron
Silicon forms a complex and dense oxide film composed of silicon dioxide and other components on the surface of cast iron, protecting the substrate. It exhibits excellent heat resistance around 600°C and can be used at high temperatures, with satisfactory oxidation and growth resistance.
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Chromium-Based Heat-Resistant Cast Iron
It remains stable at higher temperatures. With a chromium content of 15%-18%, it can operate in air furnaces at 900°C; with a chromium content of 26%-30%, it can withstand temperatures up to 1000°C; and with a chromium content of 32%-36%, it can withstand temperatures up to 1150°C. Chromium-based heat-resistant cast iron also exhibits high strength and toughness.
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Aluminum-Based Heat-Resistant Cast Iron
It can be used in high-temperature environments of 700-1100°C. At high temperatures, aluminum quickly forms a dense protective film of aluminum oxide (Al₂O₃) on the surface of cast iron, preventing further oxygen diffusion and effectively improving the cast iron's oxidation resistance.
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Nickel-based heat-resistant cast iron
Nickel-based heat-resistant cast iron offers excellent high-temperature strength and corrosion resistance, maintaining stable performance at high temperatures.
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High-alloy heat-resistant steel castings
Offer excellent high-temperature strength, oxidation resistance, and thermal fatigue resistance. For example, ZG4Cr22Ni10 heat-resistant steel castings can remain stable at 1100°C, demonstrating excellent high-temperature strength and oxidation-corrosion resistance.
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Alloying elements in heat-resistant steel
The exceptional heat resistance of these castings is attributed to the careful selection of alloying elements. Chromium, nickel, and molybdenum are common additives that form stable oxides on the surface, providing protection against corrosion and high-temperature oxidation.
High-temperature mechanical properties
Heat-resistant steel castings retain their mechanical strength and hardness even at elevated temperatures, ensuring that they can withstand heavy loads and stresses in extreme conditions.
Resistance to corrosion and oxidation
One of the most significant advantages of heat-resistant steel castings is their resistance to corrosion and oxidation, which makes them highly reliable and durable in aggressive environments.
Temperature requirements
Different applications have varying temperature requirements. It is crucial to select Heat-resistant Castings that can withstand the specific temperatures of the intended application.
Corrosion resistance
Considering the operating environment is essential to ensure that the castings possess the necessary corrosion resistance to withstand aggressive chemicals and gases.
Load-bearing capabilities
When choosingHeat-resistant Castings, it’s important to consider the loads and stresses the components will experience during operation.
Proper cleaning and inspection
Regular cleaning and inspection are necessary to identify any signs of wear, damage, or corrosion on heat-resistant steel castings.
Monitoring and preventive measures
Implementing monitoring systems and preventive measures can help detect potential issues early and extend the service life of heat-resistant steel castings.
We're professional coal chemical heat-resistant castings manufacturers and suppliers in China. If you're going to buy customized coal chemical heat-resistant castings, welcome to get quotation from our factory. Quality products and low price are available.
coal chemical heat resistant castings, Grate For Lurgi Drah ash Gasfier, Ring Component(0/10)
