NS EN ISO 4957 Ed. 1 (2000)现行
Tool Steels
出版：Norwegian Standards (Norges Standardiseringsforbund)
专家解读视频
Describes 4 grades of wrought tool steels - 1 non-alloy cold-work steels 2 alloy cold-work tool steels 3 alloy hot-work tool steels 4 high-speed tool steels
NEN EN ISO 4957:2000 - Identical
UNE EN ISO 4957:2000 - Identical
SN EN ISO 4957:2001 - Identical
BS EN ISO 4957:2000 - Identical
DIN EN ISO 4957 (2001-02) - Identical
ONORM EN ISO 4957:2001 - Identical
NF EN ISO 4957:2000 - Identical
NBN EN ISO 4957:2000 - Identical
UNI EN ISO 4957:2002 - Identical
I.S. EN ISO 4957:2000 - Identical
ISO 4957:1999 - Identical
SS EN ISO 4957 Ed. 1 (1999) - Identical
