BS 970-4:1970被替代
Specification For Wrought Steels In The Form Of Blooms, Billets, Bars And Forgings - Part 4: Valve Steels
出版：British Standards Institution
專家解讀視頻
1970 AMD 4326 [01/08/1983]1970 AMD 3606 [01/04/1981]1970 AMD 1419 [01/04/1974]1970 AMD 829 [01/11/1971]1970 [01/02/1970]
? British Standards Institution 2013
Amendment notes:
AMD 1419 published 15 April 1974
AMD 3606 published 30 April 1981
AMD 4326 published 31 August 1983
AMD 829 published 15 November 1971
EURONORM 90:1971 - Similar
ISO 683-15:1992 - Similar
ISO 683-17:1999 - Similar
ISO 683-13:1986 - Similar
