Wire material
A wire and quality technology, applied in the furnace type, furnace, heat treatment furnace, etc., can solve the problem of reducing fatigue characteristics, and achieve the effect of excellent resistance to hydrogen embrittlement
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Embodiment 1
[0105] In order to investigate the effect of the average number density of sulfides with a particle diameter of 10 to 100 nm in the 1 / 4D portion on the reduction of area value of the wire rod, the experiment described below was performed. First, by applying the condition (3) of Table 2 to the steel type K in Table 1, a region having a distribution along the prior-austenite grain boundary, And the average number density is 0.100 / μm 3A wire rod of sulfide with a particle size of 10-100nm. Next, the present inventors applied the condition (4) of Table 2 to the steel type K in Table 1 to manufacture a steel that does not have a particle diameter of 10 to 100 nm in a region from the surface of the wire rod to a depth of 1 / 4 of the diameter of the wire rod. Sulfide wire. In addition, by changing the temperature of the molten salt bath in DLP (Direct in-Line Patenting) after hot rolling, the tensile strength of these wire rods was changed within the range of 1280 to 1400 MPa. Furt...
Embodiment 2
[0109] High carbon steel having the composition shown in Table 1 was rolled under the conditions shown in Table 2 to obtain billets. These billets were hot-rolled and heat-treated to manufacture wire rods with wire diameters shown in Table 3. In the process of hot rolling a steel slab, the heating temperature of the steel slab is in the range of 900 to 1200°C, and the finish rolling temperature of the steel slab is in the range of 800 to 1050°C. In the toughening process, the temperature of the molten salt bath or the molten lead bath is in the range of 400 to 600° C., and the time for immersing the wire in the molten salt bath or the molten lead bath is in the range of 30 to 180 seconds. In the step of cooling the wire rod after the toughening treatment, the cooling rate of the wire rod is in the range of 1 to 100° C. / sec, and the cooling end temperature of the wire rod is 150° C. or less. Sol.N (mass %), measured maximum TiN-based inclusion size (μm), calculated maximum TiN...
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Abstract
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