Abstract: A brake disc material which does not crack under a great braking action, such as in a large-sized truck, consisting of 0.03 percent to 1 percent of carbon, 1.2 percent to 20 percent of chromium, and 0.1 percent to 1 percent of molybdenum, the balance being essentially iron.

Abstract: A cast steel stave cooler comprising a carbon steel cooling pipe having a roughened surface and having a coating thereon, and a cast steel embedding the cooling pipe therein. The cast steel contains 10 to 25% Cr and has a very reduced liquid-solid zone so as to prevent fusion of the cooling pipe during the casting. The cooling pipe is provided with fins which are integratedly welded to the cast steel.

Abstract: Disclosed is a sealing compound for cans, which is applied to the periphery of a can end member to seal the double-seamed portion between the can end member and a can body, said sealing compound comprising as a base component an aqueous latex of a styrene-butadiene rubber containing as a particle size-adjusting agent an alkali metal carbonate or an alkali metal salt of a phosphorus oxyacid in an amount of 0.3 to 2.0 parts by weight per 100 parts by weight of solids of the styrene-butadiene rubber.

Abstract: An electromagnetic-acoustic measuring apparatus is disclosed in which an exciting coil is wound around a body to be inspected in order to generate a magnetic field within the body in the direction parallel to a surface of the body, a transmitting coil is used to generate mechanical strain in the surface of the body by utilizing the magnetic field, a receiving coil detects the mechanical strain at the surface of the body after the mechanical strain has been propagated in the body, the exciting coil is enclosed with a separable core, the transmitting and receiving coils are supported by respective head portions of pole pieces fixed to the core, and the transmitting and receiving coils and pole pieces are water-cooled by means of cooling pipes.

Abstract: In non-contact ultrasonic flaw detection, a pulse laser beam having a frequency in the infrared band is focused by a lens and caused to strike the material to be inspected, the ultrasonic wave generated by the shock upon the laser beam striking the material is propagated within the material to be inspected and received by an electromagnetic probe which detects the defects in the material being inspected.

Abstract: Sensitivity of an electromagnetic ultrasonic probe for transmission-reception or for reception is maintained at a fixed level by first obtaining the relationship between the resonance frequency and the transmission-reception sensitivity in the range between the maximum and the minimum lift-offs and then electrically creating a relationship therebetween having an inverse frequency-sensitivity characteristic to said frequency-sensitivity characteristic and electrically adding said two relationships together.