They are divided into three groups : low alloy (up to 5 per cent alloying elements) , medium alloy ( over 5 per cent) and high alloy ( more than 10 per cent).
IS : 7598 - 1974
Alloy structural steels are widely employed in engineering industry for parts that are subject to both static and dynamic loads in operation. They have more favorable set of mechanical properties than carbon steels especially for articles of large cross-section. The alloying elements strengthen the ferrite , which is the chief constituent in the structure of these steels; increase the hardenability , refine the grain size ; and increase the resistance to softening on heating to moderate temperatures.
The principal alloying elements in structural steels are chromium, nickel, and manganese. Tungsten, molybdenum, vanadium, and titanium are not usually employed as independent additions, They are added in conjunction with chromium, nickel and manganese.
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