This British Standard, having been approved by the Aerospace Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council of the Institution on 31st January, 1967.
BS S 136:1967 history
1977BS 2S 136:1977 Specification for 1% carbon-chromium steel (vacuum arc remelted) billets, bars, forgings and parts (limiting ruling section 25 mm)
1967BS S 136:1967 BRITISH STANDARD SPECIFICATION FOR AIRCRAFT MATERIAL; 1 PER CENT CARBON-CHROMIUM STEEL