BRIGHT MEDIUM CARBON STEELS
BS970: 1955 BS970: 1991 COLOUR CODE DESCRIPTION 
KEY STEEL - EN6 TYPEBS 46 PART 1 1958red/yellowBright drawn. Imperial plus tols, metric minus tols       
EN8D080A42yellowBright / black "40" carbon steel       
EN8DM212A42yellow/greenBright drawn semi freecutting carbon steel       
EN9070M55yellow/whiteBright / black "55" carbon steel       
EN14A150M19blue/red/greenBlack carbon manganese steel       
EN32M210M15red/greenBright drawn semi freecutting case hardening steel