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Expanded/Shaped

Product advice on steels to be used for:
Important specification
  • Weldability
  • Flanging ability
  • Corrosion resistance
  • Expansion ability
Recommendation

Complex 3D surfaces can be created by shaping 3P bodies using fluid or solid pressure. The steel is typically strained in a uniaxial mode (equivalent to the uniaxial tensile test), although the manufacturing process is commonly described as ‘expansion’.

The expansion rate is typically up to 15% for mechanical forming, and up to 30% for pressurised fluid forming. If the wrong grade is selected, there is a risk that the metal body will burst during expansion, or that there will be excessive variation in the height of the can bodies.

The optimum 3P welded-body performance (axial and panelling resistance, dent resistance) is achieved through a combination of thickness and hardness.

The expansion rate of the can body may require a steel grade specifically developed for this application. These grades typically exhibit a high n-value and tighter r-value range.

For expansion rates over 20%, grades TS245 -TS260 (for expansion) are required. For non-asymmetric shapes, Creasteel® is mandatory.

Metallic coating: Tin coating only (ECCS not weldable).

Corrosion resistance: Tin coating must be selected based on the aggressiveness of the food.

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