Analysis of delivery status of stainless steel pipes

Common stainless steel delivery states include hot rolling, cold rolling, controlled rolling, normalizing, tempering, annealing, quenching, tempering, etc. The hot rolling state can effectively reduce energy consumption and costs, and can optimize stainless steel pipes and alloys. processing performance.
Cold rolling uses hot-rolled stainless steel coils as raw materials. After pickling to remove scale, cold rolling is performed. The finished product is hard-rolled coils. The cold work hardening caused by continuous cold deformation increases the strength and hardness of hard-rolled coils. , the toughness and plasticity index decreases, so its stamping performance will deteriorate, and it can only be used to produce stainless steel parts with simple deformation.
Controlled rolling means controlled rolling, that is, on the basis of adjusting the chemical composition of the stainless steel pipe, by controlling the heating temperature, rolling temperature, deformation system and other process parameters, the change pattern of the austenitic stainless steel structure and the structure of the phase transformation products are controlled. shape to achieve the purpose of refining the structure and enhancing strength and toughness.
Normalizing is a metal heat treatment process in which the stainless steel pipe fittings are heated to 30-50°C above Ac3 or Acm, and after being kept warm for a period of time, they are taken out of the furnace and cooled in the air or by spraying water, spraying or blowing air. The purpose is to refine the grains and uniformize the distribution of carbides. The difference between normalizing and annealing is that the normalizing cooling rate is faster than the annealing cooling rate, so the normalized structure is finer than the annealed structure, and its mechanical properties are also significantly enhanced. In addition, cooling outside the normalizing furnace does not occupy equipment and has higher productivity, so normalizing should be used as much as possible instead of annealing in production.
Annealing is a metal heat treatment process that rapidly heats stainless steel pipes to a certain temperature, maintains it for a certain period of time, and then cools it at an appropriate speed. One of the main process parameters of annealing is high heating temperature. The selection of annealing heating temperature for most alloys is based on the phase diagram of this alloy system.
Quenching refers to heating the stainless steel pipe to a temperature above the critical temperature Ac3 or Ac1, holding it for a period of time, making it fully or partially austenitized, and then rapidly cooling it to below Ms with a cooling rate greater than the critical cooling rate. Heat treatment process for martensitic transformation.
Tempering refers to a stainless steel material heat treatment process in which the quenched stainless steel pipe is heated below AC1, insulated and then cooled down.
Quenching and tempering treatment is a heat treatment process of high temperature tempering after quenching. High temperature tempering refers to tempering in the range of 500-650℃. Quenching and tempering can adjust the performance and material of stainless steel pipes to a great extent, so that the strength, plasticity and toughness of the pipes have better performance, thereby achieving good comprehensive mechanical properties.