ASTM A709 Grade 50W equal grade are EN10155 :S355K2G1W,NFA 35-502,E 36 WB 4 .A709 Grade 50W is the specification used for steel plate used in the manufacture of bridges.
Type 1 and Type 2, while type 1 is the most used structural steel grade.ASTM A242 covers high-strength low-alloy structural steel shapes, plates, and bars.ASTM A242/A242M Standard Specification for High-Strength Low-Alloy Structural Steel.
A high-strength, low-alloy steel plate utilized primarily in structural applications such as bridges and buildings. This grade is designed for projects requiring atmospheric corrosion resistance.
A606 steel is a High Strength Low Alloy (HSLA) steel with improved corrosion resistance compared with carbon steel. It is formable, machinable, and weldable.