We can provide free samples . Please contact Email for any inquiries

Quenching, the workpiece after heat insulation, rapid cooling in the water, oil or other inorganic salts, organic aqueous quenching medium. Quenched steel hardened, but brittle. In order to reduce the brittleness of the steel parts, steel parts after quenching for long time in a proper temperature higher than room temperature and below 710 degrees Celsius heat preservation, then cooling down, this process is called tempering. Annealing, normalizing, quenching, tempering heat treatment in the overall "four fire", quenching and the tempering relations closely, often used in conjunction, are indispensable.
"Four fire" with the heating temperature and cooling way is different, and the evolution of different heat treatment process. In order to obtain a certain strength and toughness, the process of combination of quenching and tempering, called quenching and tempering. Some of the alloys quenched after the formation of supersaturated solid solution, will be placed at room temperature or slightly higher to maintain the proper temperature for longer periods of time, in order to improve the alloy hardness, strength or electrical magnetic. This heat treatment process known as aging treatment. The pressure deformation and heat treatment effectively and closely integrated, so that the workpiece to obtain the method of strength, toughness good called thermomechanical treatment; heat treatment in vacuum atmosphere or in vacuum is called the vacuum heat treatment, it can not only make the workpiece no oxidation, no decarbonization, keep treating workpiece the surface is smooth and improve the performance, but also through infiltration agent for chemical heat treatment.
Heat treatment is the only heating the surface of the workpiece, a rolling bearing steel heat treatment process to change its surface mechanical properties. In order to heat the workpiece surface and not only make excessive internal heat incoming workpiece, using the heat source must have high energy density, that is, to give greater heat in the workpiece in unit area, so that the workpiece surface or in part to short-term or transient to high temperature. The main methods of surface treatment, laser heat treatment, quenching flame and induction heat treatment, commonly used heat source with oxygen acetylene and oxygen propane flame, the induced current, laser and electron beam.