Stainless Steel AOD Furnace: Equipment and Process (Shopping - Wholesale)
Item ID 9636512 in Category: Shopping - Wholesale
Stainless Steel AOD Furnace: Equipment and Process | |
An AOD (Argon Oxygen Decarburization) furnace is the primary equipment used for refining stainless steel. Globally, there are approximately 155 AOD furnaces with capacities ranging from 1 to 175 tons. Half of these are found in stainless steel plants, while the rest are in foundries. Over 80% of the world’s stainless steel is refined using AOD furnaces. AOD furnaces have produced more than 2 million tons of stainless steel, with significant operational improvements achieved over time. After their first upgrade, furnace capacity increased from 18 to 40 tons, while production rose from 160,000 to 400,000 tons annually. 1. Improving Furnace Lining Wear The lifespan of furnace linings is a key technical and economic factor in AOD production. Advances in process optimization and materials technology have extended the linings’ durability. Key improvements include: Reducing silicon content during steel tapping from electric furnaces. Enhancing slag-making systems. Raising the basicity of the decarburization period from 0.5 to 1.0. Increasing the basicity of another refining period from 0.8–1.0 to 2.0–3.5. High-quality refractory materials and better construction techniques have also improved furnace performance and reliability. 2. Enhancing the Desulfurization Process In China, AOD furnaces primarily use a single slag-blowing process. To reduce sulfur (S) content in steel, rapid desulfurization is implemented: The slag’s alkalinity is maintained at around 2.5 during the refining period. SiCa is added to the ladle for desulfurization. Strong stirring during steel tapping ensures residual calcium in the steel effectively removes sulfur. These improvements have increased the desulfurization rate to over 70%. 3. Producing Nitrogen-Containing Stainless Steel Nitrogen is added to stainless steel through two main methods: Alloying with nitrided materials. Direct alloying, which offers lower production costs. AOD furnaces enable direct alloying using bronze, providing significant advantages. For instance, Taigang developed a process model for nitriding stainless steel in 18-ton and 40-ton AOD furnaces. This model ensures accurate nitrogen content in the final product, with a control precision of ±0.0135%, without requiring online analysis during smelting. 4. Recycling AOD Dust and Ash AOD furnace smelting generates dust and ash, amounting to 0.7–1.0% of steel output. This waste contains valuable materials, including: 15% Cr₂O₃ 4% NiO 26% CaO 27% Fe 15% MgO The particle size is typically ≤20μm. Cr₂O₃ and NiO are precious metal oxides, and failing to recycle them wastes resources and pollutes the environment. Effective recycling of chromium (Cr) and nickel (Ni) remains a crucial focus for stainless steel manufacturers.  | |
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| Target Nation: All Nations Target City : All Cities Last Update : 25 December 2024 9:45 AM Number of Views: 34 | Item Owner : TIANJIN TEDA GANGHUA Contact Email: Contact Phone: +86 15822676888 |
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2025-01-04 (0.226 sec)