摘要:
A process for producing an ultra-low phosphorus steel containing 0.010% or less of phosphorus is disclosed, which comprises charging a desiliconized pig iron into a top- and bottom-blowing oxygen converter, introducing a slag-forming agent in a powdered form onto the molten iron together with the top-blowing oxygen and introducing a bottom-blowing gas selected from the group consisting of an inert gas, nitrogen gas, oxygen gas, carbon monoxide gas, carbon dioxide gas and mixtures thereof during the oxygen top-blowing or during both the oxygen top-blowing and the subsequent tapping.
摘要:
A method of dephosphorization and desulfurization for molten iron alloy containing chromium, which adds to the bath of molten iron alloy flux comprising alkaline-earth metal oxide and alkaline-earth halide and further adds to the same the predetermined quantity of oxidizing agent, so that simple, highly efficient and economical dephosphorization and desulfurization are performable to produce high-chromium steel or stainless steel of high quality, iron oxide, chromium oxide or oxidizing gas are used as the oxidizing agent.
摘要:
A pachinko game machine mounting unit capable of promoting its mass production, shorten its construction period and reduce a construction cost of a pachinko island. The unit is equipped with a playing ball supply tank for supplying playing balls to pachinko game machines and further to playing ball hire-out apparatus, a playing ball collecting tank for collecting the playing balls, a raising apparatus for transferring the playing balls from the playing ball collecting tank up to the playing ball supply tank, a prize ball accepting opening provided in a counter table in correspondence with each of the pachinko game machines, a cover member for opening and closing each of the prize ball accepting openings, a prize ball collecting conduit for making a communication between the prize ball accepting openings and the playing ball collecting tank, a prize ball counter for counting prize balls flowing downwardly along the prize ball collecting conduit, and a receipt issuing device for printing the number of the prize balls counted by the prize ball counter to issue a receipt.
摘要:
The invention relates to a refining lance used in blowing some additive into molten metal in a vacuum vessel when molten metal, such as molten steel, refined by employing a converter or electric furnace or the like is further refined into a metal having the desired composition. The lance includes a center hole for jetting the additive in the presence of gas and a plurality of side holes (Laval nozzle holes) for supply of accelerating gas so as to have the additive effectively added to the molten metal. The invention also proposes a method for producing low-carbon high-purity steels in molten state by using the refining lance.