Steel wire rod having excellent drawability and fatigue properties, and manufacturing method of the same
A technology of steel wire rod and axis, applied in the field of steel wire rod, can solve the problem of difficult inclusions, and achieve the effect of excellent fatigue performance and excellent drawability
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Embodiment 1
[0082]
[0083] 240 tons of various molten steels in which P has been reduced to 0.007-0.020% and S has been reduced to 0.002-0.01% in the molten steel pretreatment process are mixed with 0-5 tons of cold iron and / or 0-4 Tons of steel scrap are loaded into the converter together. At that time, molten iron, chilled iron, and steel scrap were mixed together so that the average P concentration of all iron raw materials was 0.020% or less. In the converter, the iron raw material is decarburized and blown to have a predetermined concentration, and then poured into a ladle, followed by composition adjustment (for the composition, see Table 1 below) and slag refining in a ladle furnace. The slag in ladle refining is CaO / SiO 2 0.7-1.7 and Al 2 o 3 4-25% CaO-SiO 2 -Al 2 o 3 base slag. Argon is used as the stirring gas during ladle refining, and the gas flow rate is 0.0003-0.012Nm 3 / min changes within the range of per ton of molten steel. Gas agitation times were in each cas...
Embodiment 2
[0107]
[0108] Perform molten iron pretreatment, converter operation, slag refining, continuous casting, blooming and hot rolling as in Example 1 to obtain a steel wire rod with a diameter of 8 mm, then measure the composition of inclusions in the obtained steel wire rod in the same manner as in Example 1 , size and quantity. As an example of the detailed measurement results of the inclusion morphology, the measurement results of No. 18 are shown in Table 5, and the measurement results of No. 22 are shown in Table 6. Similar measurements were made for other examples.
[0109] Then, the fatigue performance in the case where the steel wire rod was used as a spring was evaluated according to the following method.
[0110] [Evaluation method]
[0111] The fatigue properties of steel wires with a diameter of 8.0 mm were evaluated by Nakamura type rotation-bend fatigue test.
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