Graphitized petroleum coke, as a high-quality casting raw material, is mainly used in the following three areas in the field of automobile manufacturing:
Graphitized petroleum coke is often used as a carburizer in the smelting process of cast iron, such as ductile iron, gray cast iron, and cast steel, to adjust the carbon content in the molten metal. It is mainly used to cast engine cylinder blocks, crankshafts, brake discs, and other parts that require high strength and wear resistance.
Casting coatings and refractory materials, as additives for casting coatings or sand coatings, improve the surface finish of castings and reduce defects such as pores and slag inclusions. It is mainly used for precision casting of complex structural parts such as cylinder heads and gearbox housings. Graphitized petroleum coke is used to manufacture high-performance brake pads and brake discs due to its excellent friction properties and thermal stability. This helps to improve the braking performance and safety of vehicles. It is suitable for the manufacture of engine piston rings and other seals to extend engine life and improve efficiency.
The main application scenario for high-temperature alloy casting is the investment casting of high-temperature-resistant parts such as turbocharger blades and exhaust manifolds. These parts are used as mold materials or auxiliary additives to enhance heat resistance.
Its core function is to optimize material properties. By precisely controlling the carbon content, the target content is usually 3.0% or 4.5%, and the tensile strength of the casting is improved. For example, ductile iron can reach 600MP 900MP and elongation 2% and 18%. At the same time, the content of impurities such as sulfur and nitrogen is reduced, for example, sulfur <0.05%, reducing the brittleness of the casting.
Improve the casting process, and carbon equivalent adjustment ability (CE value is controlled at 4.3 4.5), improve the fluidity of molten iron, and increase the filling capacity by 20% or 30%. At the same time, reduces shrinkage defects and increases the casting yield by 5% 8to %. Replace traditional metallurgical coke, the carbon absorption rate can reach 90% or 95%. Ordinary carburizers are about 75%, and 85%, reducing the cost of a ton of steel by about 50,100 yuan.
In the casting of automobiles and auto parts, common specifications and technical parameters are fixed carbon content ≥98.5%, ultra-high purity ≥99.5%, sulfur content ≤0.03%, and ultra-low sulfur ≤0.01%. Volatile matter ≤0.5%, special process ≤0.2%, particle size distribution 0.21mm (micro-powder carbonization), 15mm (coarse particle application), tap density 0.81.2g/cm³ ,and customized adjustment.
In industry applications, die casting of motor housings for new energy vehicles: using 13mm particle specifications, combined with silica sol precision casting process, to achieve mass production of thin-walled parts with a wall thickness of 3mm±0.2mm. In future technological developments, it can be composite modified, and with silicon carbide, for example, adding a proportion of 5% or 15%, to make high-performance casting materials resistant to more than 1200℃.
Through the above technical solutions, graphitized petroleum coke has achieved the full chain value from material modification to process optimization in automotive casting.
