BS 970-3:1971

General requirements: information to be supplied by purchaser, product analysis and permitted variations, condition of material on delivery, provision of test material, testing, etc. En steels replaced. Specific requirements for alloy steels for case hardening supplied to close limits of chemical composition, to hardenability requirements, and to specified mechanical properties. Purchase to hardenability requirements, chemical composition of individual steels, hardenability data. Summary tables.