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Specifications of Structural and Heat Treatable Steels

(IS : 1977-1969; IS : 2062-1969; IS : 226-1969; IS : 961-1962)

Designation of steel Tensile strength kgf/mm Yield strength for thickness Elongation percent C
%
S
%
P
%
Typical Applications

upto 20
mm
20-40
mm

St 32-O 32-44 - - 26 - 0.07 0.07 General engineering purposes
St 42-O 42-54 26.0 - 23 - 0.07 0.07
 
St 42-S 42-54 26.0 24.0 23 0.25 0.055 0.055 All welded structures
 
St 42-W 42-54 26.0 24.0 23 0.20 0.055 0.055 Subjected to fusion welding
 
St 58-HT 58 Min. 36.0 35.0 20 0.27 0.055 0.055 Structures without welding
 
St 55-HTW 55 Min. 36.0 35.0 20 0.20 0.055 0.055 Structures with guaranteed weldability