304L SS Erw Stainless Steel Metal Pipe H13 30mm 20mm Cold Rolled

304L SS Erw Stainless Steel Metal Pipe H13 30mm 20mm Cold Rolled

Cold Rolling

Often used when precision is required, cold rolling occurs below the recrystallization temperature of the steel. Multiple supported rollers are used to shape the steel. This process creates a more attractive, uniform finish.

However, it can also deform the steel’s structure and often requires heat treatment to recrystallize the steel to its original microstructure.

Annealing

After rolling, most steel undergoes an annealing process. This involves controlled heating and cooling cycles. These cycles help to soften steel and relieve internal stress.

The exact temperatures and times involved will depend on the grade of steel, with both heating and cooling rates impacting the final product.

Descaling or Pickling

As steel is worked through the various steps, it often accumulates scale on the surface.

This accumulation isn’t simply unattractive. It can also impact the stain-resistance, durability and weldability of the steel. Removing this scale is essential to creating the oxide barrier that gives stainless it’s characteristic corrosion and stain resistance.

Descaling or pickling removes this scale using either acid baths (known as acid pickling) or through controlled heating and cooling in an oxygen free environment.

Depending on the final product, the metal might return to rolling or extruding for further processing. This is followed by repeated annealing phases until achieving the desired properties.

Stainless Steel Metal Pipe Specification