Performance indicators such as yield strength, tensile strength, elongation, r value, n value can affect the stamping performance of steel. So, when we judge the stamping performance of steel, which indexes should we mainly consider?
Yield strength: yield strength is the stress of a metal material against slight plastic deformation. The smaller the yield strength, the easier the material will yield, and the rebound after forming will be smaller, and the moldabilitshape freezing performance will be better. However, materials with low yield strength tend to wrinkle during compression deformation.
Yield strength ratio: yield strength ratio is the ratio of yield strength/tensile strength. The yield ratio has a greater influence on the sheet metal forming performance. The smaller the yield strength ratio, the longer the plastic deformation stage from yielding to rupture of the sheet, that is, the larger the deformation interval of the sheet, which is more conducive to stamping.
Elongation: elongation reflects the ability of the plate to deform plastically. In general, the greater the elongation, the better the stamping performance.
r value: r value is the ratio of the degree of narrowing in the width direction and the degree of thinning in the thickness direction when the sheet is stretched. The larger the r value, the lower the probability of cracking.
n value: n value is the work hardening index of the material. The material with large n value has uniform deformation and good stamping p
