DIN 50103-3:2017-05

This standard specifies modified Rockwell method Bm and Fm for thin sheets. The modified Rockwell method Bm and Fm apply if the samples are that thin that a visible deformation occurs on the bearing surface of the sample when using the Rockwell method B and F according to DIN EN ISO 6508-1. It is recommended to limit the application of the modified Rockwell method Bm and Fm on thin sheet according to the following thickness ranges: - Modified method according to Rockwell Bm: product thickness s > 1,1 mm - Modified method according to Rockwell Fm: product thickness 1,1 mm >= s > 0,6 mm The hardness test according to the modified Rockwell method Bm and Fm is applicable for thin sheet of steel whose hardness is within the following ranges: - Modified method according to Rockwell Bm: 50 HRBm to 100 HRBm - Modified method according to Rockwell Fm: 60 HRFm to 115 HRFm.