Chemical method to decrease oxide scale generation in hot rolling
A kind of oxide skin, thermal processing technology, applied in the direction of coating, anti-corrosion coating, metal material coating process, etc., can solve the problem of reducing processing productivity, affecting the quality of steel surface and so on
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Embodiment 1
[0189] 50 g of Ferro Frit 3110 and 50 g of water were mixed together under uniform stirring in a high shear blender (IKA® RW 20) to form a solid suspension (slurry) in which the chemical composition contained 3.7% Al 2 o 3 , 69.8% SiO 2 , 2.4%K 2 O, 15.2% Na 2 O, 6.3% CaO, 2.6% B 2 o 3 (See composition of Ferro Frit 3110 in Table 2). The slurry was applied to a part of the surface of a steel Q-Panel® R-46 (Q-Lab Corporation, size: 152 x 102 x 0.8 mm or diameter: 65 mm) with a brush or a trowel bar to provide a coated glaze material Frit 3110 grout for steel panels. The steel panels coated with the slurry were heated in an oven (Fisher Scientific TM , 30°C to about 300°C) at 100°C for half an hour to allow the formation of a powder-coated steel panel. The powder coated steel panels were placed in a furnace (Nabertherm™ C450 (30°C to about 3000°C)) and heated at 1060°C for 20 minutes followed by 1250°C for 4 hours. After heating at 1060 °C for 20 min, a translucent gla...
Embodiment 2
[0193] Under uniform agitation in a high shear blender (IKA® RW 20), 50 grams (50 g) of 325 US mesh (44 micron, see alumina specifications from ceramic suppliers in Table 5) calcined alumina and 50 g of water mixed together to form a solid suspension (slurry) in which the chemical composition contains greater than 99.0% Al 2 o 3 As a high melting point inorganic material (melting point 2000°C, bulk density 1.25 g / cm 3 ). Use a brush or a scraper to coat the solid suspension at 1 kg / m 2 up to 10 kg / m 2 A range of coating weight rates were applied to the surface of AISI 1040 mild steel panels (dimensions: 153 x 102 x 6.4 mm) to provide calcined alumina slurry coated steel panels.
[0194] Table 5 Alumina specifications
[0195] granularity melting point main component Bulk density Relative density ρ* Calcined alumina 325 mesh 2000℃ >99%Al 2 o 3
1.25 g / cm 3
31.7%
[0196] *Density relative to alumina crystals (3.94 g / cm 3 )
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Embodiment 3
[0204] The glass frit, clay and alumina are blended together. The frit was sintered at 1250 °C before producing FeO, which might bond the clay and alumina together and lower the sintering point of the film.
[0205] Sodium carboxymethylcellulose (Aqualon® CMC 7L) (0.3 g, Ceramic Shop) and water (33.4 ml) were mixed with stirring. The resulting mixture was heated at 85°C to about 90°C for about 2 hours until the CMC was completely dissolved. Cool the hot aqueous CMC solution to below 50°C. To the cooled CMC solution was added Darvan® 811 (1.0 g, Ceramic Shop) with stirring, followed by kaolin (17.6 g, Ceramic Shop), Zircopax Plus™ (17.0 g, Ceramic Shop) and silicon carbide (30.7 g , Superior Graphite). The resulting mixture was stirred for an additional 2 hours to form a slurry (17.6 wt % Kaolin, 17.0 wt % Zircopax Plus™, 30.7 wt % silicon carbide, 0.3 wt % CMC and 1.0 wt % Darvan® 811 and 33.4 wt of deionized water). (4311-012A Laboratory Formula)
[0206] The slurry was...
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