
Ferrous alloys 223
sulphurized and rephosphorized, 13XX has 1.75 per cent
manganese, etc.
2000 series Nickel steels; 23XX are nickel steels having 3.50 per cent nickel,
25XX has 5.00 per cent nickel.
3000 series Nickel chromium steels; 32XX has 1.75 per cent nickel and 1.07
per cent chromium, 34XX has 3.00 per cent nickel and 0.77 per
cent chromium.
4000 series Chromium molybdenum steels; 40XX has 0.20 or 0.25 per cent
molybdenum, 41XX has 0.50 per cent, 0.80 per cent or 0.95 per
cent chromium with 0.12 per cent, 0.20 per cent or 0.30 per cent
molybdenum.
5000 series Chromium steels containing up to 1 per cent chromium.
6000 series Chromiu