BIS Indian standards for Designation of steels | Designation of steel alloys

Bureau of Indian Standard shortly BIS uses the following designation. Symbolic Letters and Numbers to designate the steel grade (e.g. Mechanical, Physical, and Chemical). The standard IS No. is 7598:1990. Classification of Steel names For the purpose of designation, steels are classified into two types. They are: Group 1 Group 2 Group 1 – According to their application and Mechanical or Physical properties Group 2 – According to their Chemical composition Principal symbols: G – Steel casting P – Steel for pressure purposes D – Flat products for cold forming R – Rails nnn – specified minimum yield strength for the smallest thickness range Cnn – Cold rolled Dnn – Hot rolled for direct cold forming Xnn – Product where rolled conditions are not specified Additional Symbols: B – Gas bottles M – Thermo-mechanically rolled N – Normalized rolled Q – Quenched / Tempered S – Simple pressure vessels T

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