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Stainless steel seamless tube

Stainless steel seamless tube
Stainless steel seamless tube

One of the materials produced by stainless steel pipe manufacturers is stainless steel seamless steel pipes. The process and specifications of heat treatment in production: The heat treatment process of stainless steel seamless steel pipes consists of three stages: heating, heat preservation and cooling. The main types of heat treatment are annealing, normalizing, quenching, tempering solution treatment, aging treatment, cold treatment, chemical treatment and so on. The annealing is further divided into diffusion annealing, complete annealing, incomplete annealing, spheroidizing annealing, isothermal annealing, recrystallization annealing, and low temperature annealing.


Xi'an stainless steel pipe manufacturers introduce that the billet of stainless steel seamless steel pipe is heated to a higher temperature above the upper critical point Ac3 or Accm, which is generally 1050-1250 degrees. After a long period of sufficient heat insulation, and then slow cooling heat treatment, called diffusion annealing, Also called homogenizing annealing.

Diffusion annealing is mainly used for ingots, slabs and castings. The purpose of diffusion annealing is to eliminate component segregation, eliminate stress, reduce hardness, and improve steel properties.

The heating temperature of diffusion annealing is Ac3 + 150 ~ 200 degrees. The cooling system of Xi'an stainless steel tube is that the furnace temperature is cooled to 250 degrees and then air cooled. Diffusion annealing can be performed in a dedicated annealing furnace or during heating before slab rolling.