Views: 1010 Author: Site Editor Publish Time: 2024-06-04 Origin: Site
Traditional process: The two-step production process is EAF-AOD-LF-CMM. Raw materials such as nickel containing pig iron, stainless steel scrap, high chromium alloy, and electrolytic nickel are melted and refined into stainless steel mother liquor in an electric arc furnace (EAF) in a certain proportion (adjusted according to the manufacturer, process, and price difference between materials). The mother liquor is then mixed into AOD for decarburization, alloying and refining. The refined AOD molten steel is subjected to composition, temperature adjustment, and inclusion removal refining in LF, and then handed over to slab continuous casting.
The three-step production process flow is DEP-KOBMS-VOD-LF. The blast furnace molten iron is pre treated for desilication and dephosphorization using the injection method, and then mixed into the KOBMS converter for decarburization, heating, and alloying before steelmaking. The molten steel is further decarburized and denitrified in VOD, and refined in LF for fine adjustment of composition temperature and removal of inclusions before being cast into slab continuous casting.
RKEF integrated production process: The drying kiln dehydrates the laterite nickel ore into dry ore with a water content of less than 20% by recycling the exhaust gas generated by the ore heating furnace as energy. The dry ore is then transported to the rotary kiln for roasting at around 780 ℃ to remove the crystallization water from the ore and pre reduce it to calcined sand. The calcined sand enters the ore heating furnace and is electrolytically reduced to produce high-grade nickel iron. The produced nickel iron water is then sent to the AOD furnace for refining into various high-quality stainless steel.
The RKEF+AOD process can reduce intermediate processes such as casting of coarse nickel alloys and remelting in intermediate frequency furnaces, fully utilizing the thermal energy of molten iron from coarse nickel alloys. Adopting this process not only reduces electricity consumption and production costs, but also shortens product completion time and creates a cleaner and more environmentally friendly on-site environment. On average, the electricity consumption per ton of iron in the production process is reduced by 1500 degrees Celsius, and dust emissions are reduced by 80%.
Generally speaking, the cost of 300 series cold-rolled stainless steel=nickel iron cost+high carbon chromium iron cost+scrap steel cost+electrolytic nickel cost+electricity cost+steel rolling cost+acid washing cost+coke and coal cost (floating)+refractory material cost (floating)+other raw material cost+packaging cost+material loss cost.
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