Continuous-cast low-carbon resulfurized free-cutting steel

Details Continuous-cast low-carbon resulfurized free-cutting steel Continuous-cast low-carbon resulfurized free-cutting steel

C - Chemistry, Metallurgy

22

C

75/1.2

C22C 38/60 (2006.01)

Patent

CA 1289777

CONTINUOUS-CAST LOW-CARBON RESULFURIZED FREE-CUTTING STEEL ABSTRACT OF THE DISCLOSURE A continuous-cast low-carbon resulfurized free- cutting steel which consists in weight percentage of C: 0.05 - 0.15, Mn: 0.5 - 1.5, P: 0.05 - 0.10, S: 0.15 - 0.40, O: 0.010 - 0.020, one or more of Pb, Bi, and Te as accompanying elements for improving machinability at a following content: Pb: 0.05 - 3.40, Bi: 0.05 - 0.40, and Te: 0.003 - 0.10, Si: 0.003 or less, Al: 0.0009 or less, and the remainder consisting of Fe and unavoidable impurities, and contains a manganese sulfide-base inclusion with the provision that: a mean sectional area of the manganese sulfide-base inclusion present in a sectional area of 1 mm2 in the rolling direction of the steel is not less than 30 µm2; and a rate of the number of a manganese sulfide-base inclusions not in the form of a complex with oxide is not less than 80% of the total amount of manganese sulfide-base inclusion.

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