February 23, 2024

5 Heat Treatment Approaches for Seamless Steel Pipes

Heat course of treatment of seamless steel pipe mainly includes the next 5 groups:

1. Quenching   hot temperature tempering

The steel pipe is heated towards the quenching temperature to change the interior structure from the steel pipe into austenite, after which quickly cooled in a speed more than the critical quenching speed to change the interior structure from the steel pipe into martensite, after which rich in temperature tempering, the steel pipe structure is finally changed into a uniform Tempered sorbite structure. This method can’t only enhance the strength and hardness from the steel pipe, but additionally organically combine the force, plasticity and toughness from the steel pipe.

2. Normalizing

After heating the steel pipe to normalizing temperature, the interior structure from the steel pipe is totally changed into austenite structure, and then it’s a heat course of treatment that utilizes air like a medium to cool down the. Different metal structures could be acquired after normalizing, for example pearlite, bainite, martensite or their mixed structure. This method can’t only refine the grains, uniform the composition, and get rid of the stress, but additionally boost the hardness from the steel pipe and improve its cutting performance.

3. Normalizing   tempering

Following the steel pipe is heated towards the normalizing temperature, the interior structure from the steel pipe is totally changed into austenite structure, and then it’s cooled in mid-air after which matched using the tempering process. The steel pipe structure is tempered ferrite   pearlite, or ferrite   bainite, or tempered bainite, or tempered martensite, or tempered sorbite. This method can stabilize the interior structure from the steel pipe and enhance the plasticity and toughness from the steel pipe.

4. Annealing

Following the steel pipe is heated towards the annealing temperature and stored for any certain time period, it’s gradually cooled to some certain temperature using the furnace after which discharged in the furnace to cool down the. Lessen the hardness from the steel pipe while increasing its plasticity to facilitate subsequent cutting or cold deformation processing Refine grains, eliminate structural defects, uniform internal structure and composition, enhance the performance from the steel pipe or get ready for subsequent processes Get rid of the inner area of the steel pipe Stress to avoid deformation or cracking.

5. Solution treatment

The steel pipe is heated towards the solid solution temperature, so the carbides as well as other alloying elements are fully and uniformly dissolved within the austenite, after which rapidly cooled , so the carbon and alloying elements are extremely late to precipitate and acquire a heat course of treatment for any single austenite structure. The part from the process: To uniform the interior structure from the steel pipe and also the composition from the steel pipe Get rid of the hardening during processing to facilitate subsequent cold deformation processing Restore the corrosion resistance of stainless pipe.