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ANSWER: JIS G 3101 steel is the common carbon steels for general structural use . SS540 steel can be used such as bridges, ships and rolling stocks, and hot extruded sections. SS540 steel have plates, sheets, strip in coil, flat and bars, section condition.
SS540 hot rolled general carbon steel is under the Japanese standard JIS G 3101. The Carbon chemical composition of SS540 in standard is not more than 0.30%. The Yield strength of SS540 is above 390MPa, and Tensile strength is above 540MPa.