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Properties

Drawing and Spinning Stainless Steel




Austenitic stainless steel exhibit strong work hardening characteristics which affect many of the forming techniques. Machinery power levels need to be increased or existing capability levels down-rated compared with carbon steel. A higher rigidity of tools and machinery is necessary for working stainless steel.

Drawing Stainless Steel

This is the forming operation whereby flat sheet is pressed into cylindrical and rectangular shapes by means of a punch and die set up. The work is best carried out in a double action press using a bolster or pressure plate to hold back the material whilst forming is taking place, thus avoiding wrinkling of the component flange.

Within the austenitic family, similar materials will give marked differences in their deep drawing characteristics, depending on their precise chemical composition.

Mechanical and hydraulic pressure in general use can be used for stainless steel drawing operations, but again the capability is significantly reduced. For deep drawing work, the hydraulic press is preferred because speed and pressure can be accurately controlled.

Punch and die radii of nominally 5 to 10 times the material thickness will allow a smooth draw in of the flat sheet. Too large a radius will cause wrinkling, too small a radius will limit the amount of reduction achieved.

For deep drawing work, several operations are necessary with inter-stage annealing to achieve a high depth to diameter ratio. Where lubricants are used to aid drawing, then these should be removed prior to annealing. Descaling after annealing and prior to further working is essential.

Certain plastics protective coatings applied to sheet products can remain in position whilst drawing takes place and will act as an aid to pressing.

For information, annealing of the austenitic stainless steel is carried out at a temperature of 1050/1120ÂșC with rapid cooling thereafter.

Spinning Stainless Steel

Spinning can form cylindrical and bowl shaped components. This is often a one step operation using a round nose tool working over a rotating mandrel. Manual and power operated tools are used.

Related References:
1. Drawing Drawn
2. Drawing and Spinning Stainless Steel
3. Cold Drawn Stainless Steel Pipe Production
Stainless Steel Tubing, Nickel Alloy Tubing, Brass Alloy Tubing, Copper Nickel Pipe Material Grades


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