For the purpose of this standard, the definitions given in IS 1956 and the following shall apply.
3.1
Micro-Alloying Elements — Elements, such as niobium, vanadium and titanium added singly or in combination to obtain higher strength to weight ratio combined with better toughness, formability and weldability as compared to unalloyed steel of similar strength level.
3.2
Weldability — A metallic substance is considered to be weldable by a given process and for the given purpose, when metallic continuity to a stated degree can be obtained by welding using a suitable procedure, so that the joints comply with the requirements specified in regard to both their local properties and their influence on the construction of which they form a part.
3.3
Controlled Rolling — A hot rolling process in which the temperature of the steel and its reduction ratio are controlled, particularly during the final rolling passes, in order to achieve fine grain microstructure and optimum mechanical properties.
3.4
Normalizing Rolling — A hot rolling process in which the final rolling passes are carried out at a suitable temperature equivalent to normalizing temperature, followed by cooling in air to a temperature below the transformation temperature, in order to produce a structure, analogous to that obtained by a separate normalizing treatment of hot rolled product.