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ANSWER: JIS G 4051 steel is the carbon steels for machine structural use . S40C steel can be manufactured by hot rolling, hot forging and hot extruding and cold rolling. S40C steel have plates, sheets, round bars, square bars , wire rod, coil, strip, hot extruded section and so on condition.
S40C hot rolled steel is under the Japanese standard JIS G 4051. S40C is fully killed carbon steel for machine structural use quality steel.
The Carbon chemical composition of S40C is max 0.37%-0.43% .
