Specification 1, 4140 china supplier tool steel round bars 2, grade dia: max 100 mm length: max 12000 mm 3, sample free & 24 hours online Shape:steel plate/flat bar/round bar Technology:Hot work / Forged/cold drawn Heat treatment:Annealed / Q+T Surface condition:Black/Peeling/Polishing/Machined Delivery condition:Hot rolled or forged, Peeled or black surface Test:UT 100% / SGS Certification:ISO/mill certificate