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ANSWER: JIS G 3101 steel specification is the hot rolled carbon steels to be used for bridges ships,rolling stocks, petroleum storage tanks containers and other constructions that are required superiority in weldability.
The applicable thickness of SM570 steel strip is not more than 100mm (steel plates, steel strip, section steel). not more than 40mm ( flat bar)
SM570 steel delivery under steel plates, steel strip, section steel and flat steel condition.
SM570 hot rolled steel for welded structural use is under the Japanese standard JIS G 3106. The Carbon chemical composition of SM570 in standard is not more than 0.18%. Carbon equivalent Of SM570 is ≤0.44% (≤50mm); ≤0.47% (above 50mm-100mm)
The Elongation rate of SM570 is above 15%, Yield strength is above 325MPa, tensile strength is 520-640MPa. SM570 has impact test under -5 degree and the energy is above 47J.