Wuxi stamping processing involves bending or slight stretching to press metal sheets into workpieces that closely match the contour of the mold. The selection of mold steel for stamping processing should be determined based on factors such as the production batch size of the formed workpiece, the material and thickness shape of the workpiece, dimensions, and required accuracy. The normal failure of stamping molds is mainly due to wear. Soft, thin, and low-strength workpieces require low forming pressure and experience less wear. Conversely, mold wear will accelerate.

For small stamping molds, high-alloy mold steel Cr12MoV or Cr12Mo1V1 is generally used (hardness HRC 58–62). Molds that are prone to surface scratches can be subjected to nitriding treatment.

For large dies used in stamping large workpieces, the punch is often made of Cr12MoV or Cr12Mo1V steel (hardness HRC 58–62), while the die body is made of cast iron, with only the easily worn parts using inserts made of hardened Cr5Mo1V, Cr12MoV, or Cr12Mo1V1 steel. To simplify the process, inserts made of locally hardened 7CrSiMnMoV steel can also be used.

For molds producing complex and thicker workpieces, a higher grade of mold steel can be used; for forming molds of simple and thinner workpieces, a lower grade of mold material can be selected.

Cemented carbide has very high wear resistance and scratch resistance, but it is expensive, brittle, and difficult to process, generally used only for making inserts in important molds.

In recent years, steel-bonded cemented carbides and high-alloy wear-resistant steels, such as air-cooled high wear-resistant powder mold steel CPM10V (2.45% C, 5.0% Cr, 9.75% V, 1.25% Mo), have shown high wear resistance and high toughness, and their development has been quite good.

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