7 results about "Vacuum arc remelting" patented technology

This invention discloses a smelting method for large-size Fe-based superalloys for gas turbines, comprising two steps: casting metal raw materials into 710mm electrode rods in a vacuum induction furnace, and then remelting the electrode rods in a vacuum arc remelting furnace to produce 810mm steel ingots. This invention employs a combined vacuum induction melting and vacuum arc remelting (VIM+VAR) process, which effectively controls Ti element burn-off to ensure its content meets standards, and avoids excessive formation of Ti-based carbonitrides, fundamentally mitigating the negative impact on the purity of the molten steel.

The present invention relates to remelting plants for metals, such as vacuum arc furnaces (vacuum arc remelting, VAR) and electro slag remelting plants (electro slag remelting, ESR), which have one or more melting locations. The plants have a uniformly low overall height and allow weighing with the highest precision. For this purpose, they are provided with a non-coaxially driven electrode rod (140) and a weighing device (230, 240) arranged laterally. The electrode is centered without generating transverse forces which have a negative influence on the plant structure and the weighing result.

This invention relates to the field of precision alloy material processing technology, and discloses an Invar alloy precision strip for semiconductor displays, its preparation method, and applications. This invention controls sulfur content at the source and combines this with microalloying by adding 0.002–0.005 wt.% rare earth cerium (Ce) to strengthen grain boundaries and improve thermoplasticity. It innovatively employs an ultra-high purity smelting route of "vacuum induction melting (VIM) + two vacuum arc remelting (double VAR)" combined with intermediate forging to remove non-metallic inclusions such as oxides and reduce gas content, obtaining ultra-high purity ingots. Finally, through a multi-stage high-temperature diffusion forging, controlled rolling and cooling, multi-stage intermediate annealing, and precision cold rolling, a precision strip with a thickness of 0.10 mm is prepared. Through the above process, the strip prepared by this invention has extremely high purity, a uniform and fine microstructure (grain size 8–10), and excellent surface quality and shape, fully meeting the stringent requirements of semiconductor display devices for substrates.

This application discloses a method for controlling white spot defects and a vacuum arc remelting device, belonging to the field of vacuum arc remelting technology. Its main purpose is to achieve real-time identification of electrode shavings and to adjust the power differentially based on the size of the shavings, thereby improving the control effect of white spot defects during the vacuum arc remelting process. The main technical solution of this application is as follows: The white spot defect control method includes: acquiring vacuum arc remelting process parameters; identifying shavings and determining the equivalent size of the shavings based on the process parameters; generating control commands based on the correspondence between the equivalent size of the shavings and at least two determined critical sizes; and adjusting the melting power of the vacuum arc remelting device in response to the control commands.

The present application relates to the metallurgical technology field, especially relate to a kind of off-oven refining combined vacuum arc remelting preparation ultra-pure stainless steel method.The preparation method of the present application is by AOD station to transfer the crude molten steel obtained by EAF smelting to AOD refining furnace to blow oxygen refining, pre-reduction refining slag is CaO-CaF2-SiO2-MgO slag system;After pre-reduction treatment, reduction treatment is carried out, and the reduction refining slag is CaO-CaF2-SiO2-MgO slag system;The molten steel after reduction treatment is transferred to VD furnace for vacuum treatment, and the treated molten steel is transferred to ladle, then poured into mold, and ingot is obtained;After ingot is forged into electrode, ultra-pure stainless steel is prepared by VAR, with ultra-high cleanliness, coarse system inclusions is 0 level, fine system A+B+C+D inclusions≤0.5 level, effectively realize the accurate low control of aluminum content in steel, and simultaneously reduce the oxygen content and non-metallic inclusion content in steel, finally prepare high-quality ultra-pure stainless steel.

The present invention relates to remelting plants for metals, such as vacuum arc remelting (VAR) furnaces and electroslag remelting (ESR) plants, which have one or more melting points. The plants have a consistently low overall height and enable weighing with the highest accuracy. For this purpose, they are equipped with a non-coaxially driven electrode rod and a laterally arranged weighing device. The electrode is centered without generating transverse forces that could negatively affect the plant design and the weighing result.