answersLogoWhite

0

emergency number. These numbers were actual devised for use during the period of the second world war and remained in useinto the 1970's and beyond

the actual full description was in the form BS970 EN8 for example

they were effectively made obsolete when the system was implemented

EN8 became 080M40 wher the M refered to mechenical properties ( or A for analysis or rather chemical properties), and the number refering to the chemical composition of key elements.

For example the 40 of M 40 refers to the carbon range

other examples would be EN16 became 605M36

0r

EN24 becomes 817M40

User Avatar

Wiki User

14y ago

What else can I help you with?