CALL US ANYTIME +86-577-86383608
Search
Contact Us
inner banner

What is Annealing of Stainless Steel 304 Pipes?

What is annealing of stainless steel 304 pipes? What is the annealing process? Annealing is a heat treatment process for stainless steel welded pipes. Its purpose is to eliminate residual stress, stabilize size, and reduce deformation and cracking tendency.


What is stainless steel 304 pipes annealing?

With the pipe produced by cold processing, carbide precipitation, lattice defects, inconsistent organization and composition would be caused, which reduces the corrosion resistance of stainless steel. At this time, annealing treatment (or solution treatment) is required.


Why should stainless steel 304 pipes be annealed?

1. Reduce the hardness of steel and increase the plasticity to facilitate cutting and cold deformation processing.

2. Refine the grains, uniform the structure and composition of the steel, improve the performance of the steel or prepare for the subsequent heat treatment.

3. Eliminate residual internal stress in steel to prevent deformation and cracking.


In production, the annealing process is widely used. According to the different purposes of annealing of the workpiece, there are various annealing process specifications, commonly used are stress relief annealing, full annealing and spheroidizing annealing.


(1) Full annealing

It is used to refine the coarse superheated structure of poor mechanical properties after casting, forging and welding of medium and low carbon steel. Heat the workpiece to 30-50℃ above the temperature at which all ferrite is transformed into austenite, keep it for a period of time, and then slowly cool down with the furnace. During the cooling process, the austenite transforms again to make the steel structure finer.


(2) Spheroidizing annealing

It is used to reduce the high hardness of tool steel and bearing steel after forging. The workpiece is heated to 20-40°C above the temperature at which the steel begins to form austenite, and then slowly cooled after holding the temperature. During the cooling process, the lamellar cementite in the pearlite becomes spherical, thereby reducing the hardness.

Related News

More Tubing Fittings To Consider

  • 45 Degree Elbow

    45 Degree Elbow

    July 10, 201845 degree elbows are handy to convey, easy to cope with,viable, reliable and come with a right floor finish.view
  • Eccentric Reducer

    Eccentric Reducer

    July 10, 2018Eccentric reducer is the size of the head whose center of the circle is not on the same line.view
  • Lap Joint Flanges

    Lap Joint Flanges

    July 10, 2018ASME/ANSI B16.5; 1/2"-24" ; 150LB, 300LB, 600LB, 900LB; 1/2"-12";1500LB; 2500LB.view