Electroslag remelting slag
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Electroslag remelting is a process that uses the resistance heat generated by liquid slag to melt, refine, and solidify a consumable metal electrode in a crystallizer. Electroslag remelted steel has many advantages, including high purity, dense structure, uniform composition, smooth surface, and excellent properties. The quality of steel and nickel-based alloys depends critically on their purity and microstructure. These two characteristics can be optimized by adding (electroslag) products during the steel and alloy ESR refining process. Electroslag remelting technology has been an important means of producing special materials since its inception. Slag is an indispensable raw material in the field of electroslag metallurgy, playing an important role in heat generation, refining, and ingot formation in electroslag metallurgy. The quality of the slag used directly affects the quality of the final product. The main components of the slag are CaF2, CaO, MgO, Al2O3, SiO2, TiO2, etc., and the raw materials come from fluorite, lime, magnesia, industrial alumina, quartz sand, titanium dioxide, etc. Domestic slag is mostly produced in a single step, while foreign countries use pre-melted slag for electroslag production, achieving good results.
Product Model
The typical composition of Electroslag remelting slag is: 40F/25/3/25/7: 40% CaF2, 25% CaO, 3% MgO, 25% Al2O3, 7% SiO2, other residual amounts controlled: ≤0.15% H2O, ≤0.3% FeO, ≤0.05% C, ≤0.005% P, ≤0.03% S. Hemispherical temperature 1233℃, viscosity at 1500℃ is 0.0359 Pa·s. Due to the extremely low water content in the slag and the strict control of impurities such as FeO, P, S, and Bi that easily cause ingot quality problems, the product quality is stable. The company mainly produces binary, ternary, quaternary, and quinary slag systems, which can also be divided into the following models:
Asia-Pacific New Materials ESR Slag System
| Product Name | Specifications | CaF2% | Al2O3% | CaO% | MgO% | TiO2% | SiO2% | H2O% | S% | P% | C% | FeO% |
| Electroslag Pre-melted Slag | YT-2050 | 20±3 | 50±2 | 30±2 | / | / | ≤1.2 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-3534 | 35±3 | 34±2 | 28±2 | 3±1 | / | ≤1.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-3830 | 38±3 | 30±2 | 28±2 | 4±1 | / | ≤2.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-4035 | 40±3 | 35±2 | 20±2 | 3±1 | 2±1 | ≤1.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-4822 | 48±3 | 22±2 | 20±2 | 5±1 | 3±1 | ≤1.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-5025 | 50±3 | 25±2 | 19±2 | 3±1 | / | 3±1 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-5527 | 54±3 | 26±2 | 5±1 | 3±1 | 9±1 | ≤1.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-6020 | 58±3 | 20±2 | 15±2 | 5±1 | / | ≤1.2 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
| Electroslag Pre-melted Slag | YT-6229 | 62±3 | 29±2 | 5±2 | 4±1 | / | ≤2.0 | ≤0.03 | ≤0.03 | ≤0.014 | ≤0.05 | ≤0.15 |
Common Electroslag Remelting Slag Systems
| Slag System | Chemical Composition (wt%) | Application Characteristics | ||||||
| CaF₂ | CaO | MgO | Al₂O₃ | SiO₂ | TiO₂ | Fe₂O₃ /Mno | ||
| AF7 or 70F/0/0/30 | 69.0 | -- | -- | 29.0 | 1.5 | -- | 0.5 | General purpose, low hydrogen absorption |
| CAF6 or 60F/20/0/20 | 58.0 | 20.0 | -- | 20.0 | 1.5 | -- | 0.5 | Low melting point, good fluidity at low melting rate Fluidity |
| CAF4 or 40F/30/0/30 | 40.0 | 27.5 | 1.5 | 29.0 | 1.5 | -- | 0.5 | Moderate conductivity, moderate melting rate, low energy consumption |
| CAF3 or 32F/30/3/32/3 | 31.5 | 29.5 | 3.0 | 33.0 | 3.0 | -- | 1 | Suitable for exchanging electrodes, saving electricity |
| CAF1 or 10F/43/0/43/3 | 10.0 | 43.0 | -- | 43.0 | -- | 1.0 | High melting rate, low energy consumption, not suitable for low-aluminum steel | |
| AC-FS 42-2 or 20F/15/5/40/20 | 20.0 | 15.0 | 5 | 40.0 | 20.0 | -- | -- | Acidic slag, suitable for sulfur-containing steel |
| FC2-AT or 60F/20/0/10/10 Ti | 60.0 | 20.0 | -- | 5-15 | -- | 5-16 | 0.5 | Contains TiAl alloy steel |
| CA-S or 0F/45/0/45/8 | -- | 56.0 | 2.0 | 33.0 | 8.5 | -- | 1.0 | Fluorine-free slag is suitable for aluminum-containing steel |
Application Range
Electroslag pre-melted slag has been widely used in electroslag remelting processes in recent years, and is very maturely applied to the smelting of special steel grades, martensitic and austenitic stainless steels at home and abroad. Our products are currently widely used in Shandong, Jiangsu, Tianjin, Shanghai, Shanxi, Wuhan, Sichuan, Gansu, etc., and exported to Japan, South Korea, Taiwan, Pakistan, Russia, etc. As follows:
| G20Cr2Ni4 | 4Cr13 | 5Cr15MoV | 70CrNiMoV | H13 | 304L |
| TP321 | TP316LN | 0Cr17Ni12Mo2 | 022Cr19Ni10 | X2CrNi19.10 | 9Cr2Mo |
Advantages
01
Stable slag composition to avoid the disadvantage of unstable slag composition during production.
02
Easy to arc slag formation, short time, good quality at the bottom of the steel ingot, and high yield.
03
Significantly simplifies or even eliminates slag baking, reducing the power consumption of slag baking.
04
The moisture content in the slag is extremely low, effectively preventing a large amount of hydrogen increase during the remelting process, preventing slag bursting during slag formation, and ensuring operational safety.
05
Using granular slag, less dust, less environmental pollution, and especially less wear and tear on the transmission parts of mechanical equipment.
06
From the domestic and international development point of view, using pre-melted slag for electroslag metallurgy production is an inevitable trend of future development.
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Electroslag remelting slag
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