To BS 4659 B01
bars are goround to width +0-0.010″ and thickness +/- 0.001″

lengths 6″ up 18″ and 3ft long some sizes
stock bars are annealled HB229 max

C Mn Cr W V
0.95 1.20 0.55 0.55 0.20

harden -Quench in oil from 780c to 820c
for hardness of Hrc 63/64
Temper for 1 hour at

150c HRc 62
200c ” 60
250c ” 58
350c ” 56