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Ss440 A36 S20c S45c 1020 1045 St37 1018 Cold Drawn Round Steel Bar / 4140 1045 Cold Drawn Steel Bars / 1045 1020 Cold Rolled Steel Square Bars, Find Details and Price about Steel Bar Round Steel Bar from Ss440 A36 S20c S45c 1020 1045 St37 1018 Cold Drawn Round Steel Bar / 4140 1045 Cold Drawn Steel Bars / 1045 1020 Cold Rolled Steel Square Bars - Laiwu Xincheng Metal Co., Ltd.