BS 970-4 70th Edition, February 12, 1970
Wrought Steels in the Form of Blooms, Billets, Bars and Forgings Part 4: Valve Steels
Includes all amendments and changes through Amendment 4, August 1983
Additional Comments: W/D S/S BY BS EN 10090
Published By:British Standards Institution (BSI)
General requirements: information to be supplied by purchaser, product analysis and permitted variations, condition of material on delivery, hardness testing, etc. En steels replaced. Chemical composition, condition of supply, approval test and heat treatment of individual valve steels. Summary tables.