Usual grades are referred to as 'S275J2' or 'S355K2W'. In these illustrations, 'S' denotes structural rather then engineering steel; 275 or 355 denotes the generate power in newtons for each sq. millimetre or even the equal megapascals; J2 or K2 denotes the elements toughness by reference to Charpy affect test values; plus the 'W' denotes weatherin… Read More