Abstract: An orifice plate for liquid injection made of plate-shaped stainless steel, wherein an orifice is formed by shearing, is characterized in that the average crystal grain size of the stainless steel is 3 ?m or less. The thickness of the plate-shaped stainless steel is 1.2 mm or less, and preferably 0.1 mm or less. The aspect ratio of the orifices is 0.8 or lower. The orifices are formed orthogonal to the plate surface, or slanted by 50° or at smaller angles. The plate-shaped stainless steel has a composition containing C, Mn, and Si.

Abstract: An orifice plate for liquid injection made of plate-shaped stainless steel, wherein an orifice is formed by shearing, is characterized in that the average crystal grain size of the stainless steel is 3 ?m or less. The thickness of the plate-shaped stainless steel is 1.2 mm or less, and preferably 0.1 mm or less. The aspect ratio of the orifices is 0.8 or lower. The orifices are formed orthogonal to the plate surface, or slanted by 50° or at smaller angles. The plate-shaped stainless steel has a composition containing C, Mn, and Si.

Abstract: Disclosed is a multilayered steel composite which compatibly achieves properties such as strength and ductility that are incompatible in conventional steels and is excellent in strength, ductility, weldability, toughness and fatigue strength. Also, disclosed is a method for producing the multilayered steel which is produced by rolling with least two kinds of steels having different chemical compositions and microstructure or different mechanical properties, in combination.

Abstract: Disclosed is a multilayered steel composite which compatibly achieves properties such as strength and ductility that are incompatible in conventional steels and is excellent in strength, ductility, weldability, toughness and fatigue strength. Also, disclosed is a method for producing the multilayered steel which is produced by rolling with least two kinds of steels having different chemical compositions and microstructure or different mechanical properties, in combination.

Abstract: A method and an apparatus for simply disposing medical waste from a medical institution on site. The method comprises crushing medical waste in a closed container, exhausting air out of the container, sterilizing the air before releasing it into the atmosphere, and filling the container with a high-pressure steam having a temperature between 110.degree. C. and 150.degree. C. to sterilize the crushed medical waste. The apparatus is equipped with a pressure container having at least one air-tight seal, an internal waste crushing mechanism such as blades, an internal supply of steam, a valve for exhausting air from the container, and an air sterilizer for the exhausted air.

Abstract: A multilayer interconnection circuit board includes insulating layers and conductor wiring layers which are alternately laminated. The uppermost conductor wiring layer is electrically connected to an intermediate conductor wiring layer to a predetermined stage by irradiating laser beams in the direction of lamination of layers so that the conductor wiring layer or layers located above the intermediate conductor wiring layer are successively molten by the laser beams. The surface irradiated by the laser beams of the conductor wiring layer at the predetermined stage is treated to reflect laser energy, and the surface of the conductor wiring layer or layers which are molten by the laser beams is treated so as to be susceptive to absorb the laser beams.