专家解读视频
NEN-EN-ISO 4957 specifies requirements for the following grades of wrought tool steels: a) non-alloy cold-work tool steels; b) alloy cold-work tool steels; c) alloy hot-work tool steels; d) high- speed tool steels.
EN ISO 4957 : 2018 - Identical
EN ISO 4957 : 1999 - Identical
ISO 4957:2018 - Identical
EN ISO 4957 : 2018 - Identical
EN ISO 4957 : 1999 - Identical
ISO 4957:2018 - Identical
