3results about How to "Smooth casting" patented technology

This application relates to the field of building construction technology, and in particular to a roof slab formwork structure, including embedded components and multiple support components. The embedded components include multiple embedded frames, which are evenly spaced along a first direction, with one right-angled side of the embedded frame close to the outer side of the shear wall. The support components correspond one-to-one with the embedded frames and include a support base, multiple channel steels, and multiple plywoods. The support base includes a first end face and a second end face, which are perpendicularly connected. The first end face is attached to the right-angled side of the embedded frame near the outer side of the shear wall. The multiple channel steels are evenly divided into multiple groups, with two channel steels in each group. The multiple groups of channel steels are distributed along the first direction and are all connected to the top of the second end face. Two channel steels in each group are sequentially spaced along the second direction on the second end face. The plywoods are connected to the side of the channel steels away from the second end face. This application has the effect of increasing the stability and safety of the entire formwork system.

The invention provides a method for inhibiting blockage of a rare earth steel casting nozzle, which comprises the following steps of: before rare earth steel is cast, casting calcium treatment molten steel, and starting to cast the rare earth steel after the calcium treatment molten steel is cast; the molten steel subjected to calcium treatment comprises the following components in percentage by weight: 0.0020 to 0.0040 percent of Ca, 0.025 to 0.035 percent of Als, less than or equal to 0.0015 percent of T.O and less than or equal to 0.0020 percent of S; the rare earth steel is characterized in that T.O is less than or equal to 0.0015 wt%, S is less than or equal to 0.0010 wt%, Als is 0.030-0.050 wt%, and RE is 0.003-0.006 wt%. According to the method, a CaO-Al2O3-RE2O3 stable corrosion-resistant protective layer is generated on the inner wall of the nozzle through calcium treatment in the first furnace before rare earth steel casting and rare earth molten steel casting, direct contact and erosion reaction of rare earth elements and nozzle refractory are blocked, the generation condition of a chemical deposition layer on the inner wall of the nozzle is eliminated, and the nozzle nodulation and blockage risks are remarkably reduced.

This invention belongs to the field of metallurgical technology, specifically relating to a method for preparing industrial pure iron. The composition of this industrial pure iron, calculated by weight percentage, is: [C]≤0.01%, [Si]≤0.01%, [Mn]≤0.05%, [P]≤0.01%, [S]≤0.010%, [Al]: 0.03~0.05%, total oxygen ≤0.005%, with the remainder being Fe. By adding an oxygen barrier, calcium carbide, and aluminum granules to the LF refining furnace to create white slag, it is possible to achieve slag FeO≤1% while controlling the oxygen content of the molten steel at 0.05~0.09%, ensuring the decarburization requirements under non-oxygen blowing conditions in the RH furnace. After decarburization in the RH furnace, aluminum is added to remove oxygen from the molten steel, ultimately ensuring that the slag FeO content is controlled below 2%, enabling the smooth casting of small square billets containing aluminum steel.