BS EN ISO 4957:2018,Tool steels.You can download it here for free.Thanks for your visiting.
BS EN ISO 4957:2018 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;
If not stated otherwise, this document applies to all types of hot-rolled, forged, cold-drawn or cold rolled products or products produced by powder metallurgy, which are supplied in one of the surface and heat-treatment conditions given in 6.2 and Table 1.
Where the heat resistance of the tools is of particular importance, as for example in the case of tools for hot forming glass, the material selection is based on ISO 4955.
4 Classification and designation
4.1 Classification
The classification of the relevant steel grades shall be in accordance with ISO 4948-1.
4.2 Designation
For the steel grades covered by this document, the steel names, as given in the relevant tables, shall be allocated in accordance with ISO/TS 4949.
For information on designation of comparable steels, see Annex C,