What are the heat treatment processes for stainless steel plates

Annealing is to heat the stainless steel plate to an appropriate temperature, use different holding times according to the material and the size of the workpiece, and then slowly cool it. Internal stress is released to obtain good process performance and performance, or to prepare for further quenching. Normalizing or normalizing is to heat the workpiece to a suitable temperature and then cool it in the air. The effect of normalizing is similar to that of annealing, except that the structure obtained is finer. It is often used to improve the cutting performance of materials, and sometimes it is used for some Less demanding parts are treated as final heat treatment.

Quenching is to rapidly cool the workpiece in water, oil or other inorganic salt solution, organic aqueous solution and other quenching medium after heating and keeping warm. After quenching, the stainless steel plate becomes hard, but at the same time becomes brittle. In order to reduce the brittleness of the stainless steel plate, the quenched stainless steel is kept at an appropriate temperature higher than room temperature and lower than 650°C for a long time, and then cooled. This process is called tempering. Annealing, normalizing, quenching, and tempering are the "four fires" in the overall heat treatment. Among them, quenching and tempering are closely related, and they are often used together, and one is indispensable. The above four fires have evolved different heat treatment processes with different heating temperatures and cooling methods. In order to obtain a certain strength and toughness, the process of combining quenching and high temperature tempering is often called quenching and tempering. After some alloys are quenched to form a supersaturated solid solution, the material is kept at room temperature or a slightly higher temperature for a long time to improve the hardness, strength or electrical magnetism of the alloy. Such heat treatment process is called aging treatment.
Surface heat treatment is a heat treatment process that only heats the surface of the stainless steel plate to change the mechanical properties of the surface of the stainless steel plate. In order to only heat the surface of the stainless steel plate without passing too much heat into the interior of the stainless steel plate, the heat source used must have a high energy density, that is, a large amount of heat energy must be given to the workpiece per unit area to make the stainless steel The surface or part of the plate can reach high temperature for a short time or instantaneously. The main methods of surface heat treatment of stainless steel plate are flame quenching and induction heating heat treatment. The commonly used heat sources are flames such as oxyacetylene or oxypropane, induced current, laser and electron beam. the
Chemical heat treatment is a metal heat treatment process that changes the chemical composition, structure and properties of the surface of stainless steel plates. The difference between chemical heat treatment and surface heat treatment is that the latter changes the chemical composition of the surface layer of the workpiece. Chemical heat treatment is to heat the workpiece in a medium (gas, liquid, solid) containing carbon, nitrogen or other alloying elements, and keep it warm for a long time, so that the surface of the workpiece is infiltrated with elements such as carbon, nitrogen, boron and chromium. After infiltration of elements, other heat treatment processes such as quenching and tempering are sometimes performed. The main methods of chemical heat treatment are carburizing, nitriding and metallizing. the


Heat treatment is an important process in the manufacturing process of mechanical parts and stainless steel plate workpiece molds. In general, this process can ensure and improve various properties of stainless steel plates, such as wear resistance and corrosion resistance. It can also improve the structure and stress state of the blank to facilitate various cold and hot processing.