Deep drawing steel

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The term deep-drawing steel encompasses those types of steel that are suitable for further processing by deep-drawing . These steels are generally very soft and must not have a pronounced yield point .

Classification

Soft steels for cold forming are standardized according to DIN EN 10111 and have the designations DD11 to DD14.

  • DD11: Drawing quality - up to medium drawing depth, tight radii
  • DD12: Deep drawing quality - increased forming requirements, very tight radii
  • DD13: Special deep-drawing quality - high forming requirements, multi-stage deep-drawing
  • DD14: Special deep-drawing quality containing boron - highest forming requirements, wider application range than DD13

The designations DC01 - DC07 standardized according to DIN EN 10130 are also common, whereby DC07 has the so-called special deep-drawing quality.

Bake-hardening steel sheets are of great importance , especially in the motor vehicle industry. The sheet metal is only soft and easy to form, the finished drawn part is heated to 170–200 ° C after the deep-drawing process and experiences an increase in strength.

TRIP steel sheets (TRansformation Induced Plasticity) are also mainly used in the automotive industry. They have high strength and also good elasticity. They are softer before forming than afterwards, because during the forming process the retained austenite in the TRIP steel is transformed into a harder martensite structure.

literature

EUROPA teaching material: Specialist knowledge of metal, mechanical technology, 55th edition