KR880000615A - Cold drawn free cutting resulfurization and reprinting rods with controlled mechanical properties and controlled machinability - Google Patents

Abstract

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Description

Cold drawn free cutting resulfurization and reprinting rods with controlled mechanical properties and controlled machinability

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Claims (15)

Cold drawn resulfurization and rephosphorization free cutting steel bars having the following composition: C 0.08 wt% or less 0.6 wt% to 1.4 wt% Mn Si 0.1 wt% or less P at least 0.03% by weight S 0.25 wt% to 0.50 wt% Cb 0.01 wt% to 0.10 wt% V 0.1 wt% or less 0.15% by weight or less of total amount of Ni, Cr, Mo, and Cu, and the remaining amount of iron; The ratio of wt% Mn / wt% S is 1.6 to 4.0, and the ratio of (wt% Mn-1.62 × wt% S) / wt% Cb is 2 to 50. The cold drawn steel bar according to claim 1, wherein the cold drawn steel bar contains Pb in an amount of 0.03% to 0.35% by weight. The cold drawn steel bar according to claim 1, wherein the cold drawn steel bar contains Zr in an amount of 0.005% by weight to 0.05% by weight. The cold drawn steel bar according to claim 1, wherein Bi is contained in an amount of 0.05% to 0.25% by weight. The cold drawn steel bar according to claim 1, which contains Pb in an amount of 0.03% to 0.15% by weight and Bi in an amount of 0.05% to 0.15% by weight. The cold drawn steel bar of Claim 1 containing N in the quantity of 0.006 weight%-0.012 weight%. The cold drawn steel bar according to claim 1, which contains Bi in an amount of 0.05% to 0.25% by weight and Te in an amount of 0.005% to 0.05% by weight. 2. The cold drawn steel bar according to claim 1, wherein the amount of Cb is 0.01% to 0.04% by weight and the rod has a yield strength of approximately 60 ksi. 2. The cold drawn steel bar according to claim 1, wherein the amount of Cb is 0.02% to 0.06% by weight and the rod has a yield strength of approximately 65 ksi. 2. The cold drawn steel bar according to claim 1, wherein the amount of Cb is 0.02% to 0.07% by weight and the rod has a yield strength of approximately 70 ksi. 2. The cold drawn steel bar according to claim 1, wherein the amount of Cb is 0.06% to 0.1% by weight and the rod has a yield strength of approximately 80 ksi. Cold drawn redrawing and resulfurized free cut steel bars formed from hot rolled steel coils having the following composition: C 0.06% by weight or less Mn 0.6% to 1.15% by weight Si 0.1 wt% or less P 0.03% to 0.06% by weight S 0.25 wt% to 0.40 wt% Cb 0.01 wt% to 0.07 wt% 0.15% by weight or less of total amount of Ni, Cr, Mo, and Cu, and the remaining amount of iron; The ratio of wt% Mn / wt% S is 2.0 to 3.5, (wt% Mn-1.62 × wt% S) / wt% Cu is 2 to 50, wt% S = (0.0042-0.0054) × desired yield strength ( ksi). The cold drawn steel bar according to claim 1, wherein the area reduction during cold drawing is 15% to 30% of the hot rolled bar having a yield strength of 60 to 80 ksi. Cold drawn redrawing and resulfurized free cutting steels having the following composition, formed by hot rolling a rod having a cross section of 5.08 cm (2 in) or less: C 0.08 wt% or less Mn 0.7% to 1.30% by weight Si 0.1 wt% or less P 0.03% to 0.09% by weight S 0.28 wt%-0.50 wt% Cb 0.02% to 0.08% by weight V 0.1 wt% or less 0.15% by weight or less of total amount of Ni, Cr Mo, and Cu, and the remaining amount of iron; The ratio of weight% Mn / wt% S is 2.0 to 3.2, the ratio of (wt% Mn-1.62 × wt% S) / wt% Cb is 4 to 51, wt% S = (0.0045-0.0058) × desired yield strength ( ksi). Cold drawn and resulfurized free-cut steel bars of the following composition, formed from hot rolled rods having a cross-section of at least 5.08 cm (2 in): C 0.08 wt% or less Mn 0.8% to 1.4% by weight Si 0.1 wt% or less P 0.03% to 0.9% by weight S 0.30% to 0.50% by weight Cb 0.02% to 0.10% by weight V 0.1 wt% or less 0.15% by weight or less of the total amount of Nr, Cr, Mo, and Cu, and the remaining amount of iron; The ratio of wt% Mn / wt% S is 2.0 to 3.5, and the ratio of (wt% Mn-1.62 × wt% S) / wt% Cb is 5 to 25, wt% S = (0.0045-0.0063) × desired yield strength (ksi). ※ Note: The disclosure is based on the initial application.