摘要:
A method continuously creates a bainite structure in a carbon steel, especially a strip steel by austenitizing the carbon steel; introducing the austenitized carbon steel into a bath containing a quenching agent; adjusting the carbon steel to the transformation temperature for bainite and maintaining the transformation temperature for a certain period of time; and then cooling the carbon steel. The carbon steel stays in the bath until a defined percentage of the bainite structure relative to the total structure of the carbon steel has formed. Residues of the quenching agent are removed from the surface of the carbon steel by blowing the same off when the carbon steel is discharged from the bath, and the remaining structure components of the carbon steel are then transformed into bainite in an isothermal tempering station without deflecting the carbon steel at all.
摘要:
An apparatus for processing nonferrous metal alloy includes a first liquid metal sodium tub, a second liquid metal sodium tub, and a carrier. The first liquid metal sodium tub stores liquid metal sodium at about 450null C., and heats the nonferrous metal alloy rapidly to put the nonferrous metal alloy in a solid solution state. The second liquid metal sodium tub stores liquid metal sodium at about 120null C., and cools the nonferrous metal alloy rapidly to suppress growth of a Guinier-Preston (G-P) zone in the nonferrous metal alloy while in the solid solution state. The carrier, such as a guide roller, carries the nonferrous metal alloy from the first liquid metal sodium tub to the second liquid metal sodium tub. Crystal structures in the nonferrous metal alloy can be miniaturized while preserving grating defects generated in crystal structures of the nonferrous metal alloy. Also, the solid solution state itself becomes a supersaturated solid solution state in which segregation and concentration are suppressed in accordance with solute atoms in the solid solution. As the result of these effects, growth of the G-P zone, in which solute atoms in solid solution are gathered and deposited, is suppressed so as to realize ultrahigh strength for the nonferrous metal alloy.
摘要:
Cold-rolled, non-microalloyed carbon manganese steel (0.11% to 0.18% C, 1.20% to 1.40% Mn) is preheated at 700.degree. to 1000.degree. F., heated to 1500.degree. to 1575.degree. F., and quenched to 800.degree. to 950.degree. F. in a continuous process to develop minimum yield strength of 70,000 psi, minimum tensile strength of 85,000 psi, and 14% minimum elongation.
摘要:
A method continuously creates a bainite structure in a carbon steel, especially a strip steel by austenitizing the carbon steel; introducing the austenitized carbon steel into a bath containing a quenching agent; adjusting the carbon steel to the transformation temperature for bainite and maintaining the transformation temperature for a certain period of time; and then cooling the carbon steel. The carbon steel stays in the bath until a defined percentage of the bainite structure relative to the total structure of the carbon steel has formed. Residues of the quenching agent are removed from the surface of the carbon steel by blowing the same off when the carbon steel is discharged from the bath, and the remaining structure components of the carbon steel are then transformed into bainite in an isothermal tempering station without deflecting the carbon steel at all.
摘要:
A steel wire to be coated is brought across the graphite spout of a crucible filled with a bath of molten metal, after having first been heated in a tubular duct filled with protective gas by an electric coil powered by a high frequency source to a temperature lower than that of the molten metal contained in the spout. The melting point of this metal is greater than the austenizing temperature of the steel. On leaving the spout, the coated steel wire is then cooled in a controlled manner to avoid hardening, for example, if it is a question of a steel of approximately 0.7% carbon, by having it spend several seconds in a fluidized bed whose temperature is maintained at a temperature of the order of 550.degree. C.
摘要:
A method for heating a metallic strand 16 such as a wire or strip comprises passing the strand 16 along a metallic tube 4 which is filled with molten metal 13, the tube wall being heated by a furnace chamber 3 through which the tube 4 extends.