Steel wire for non-heat treated machine part, and non-heat treated machine part
A mechanical component, non-quenched and tempered technology, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of fracture, hydrogen embrittlement resistance, etc., and achieve excellent tensile strength and hydrogen embrittlement resistance, and excellent cold workability , Excellent effect of hydrogen embrittlement resistance
Active Publication Date: 2018-08-03
NIPPON STEEL CORP
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Problems solved by technology
[0003] However, as the strength of the high-strength mechanical parts increases, especially when the tensile strength of the high-strength mechanical parts is 1100 MPa or more, fractures caused by hydrogen embrittlement (that is, the hydrogen embrittlement resistance characteristics become more likely to occur) fall easily)
Method used
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Embodiment
[0292] Examples of the present application are shown below, but the present application is not limited to the following examples.
[0293] [Level (condition) 1 to 28]
[0294]
[0295] Using the billet with the chemical composition shown in Table 1, the steel wire of the diameter (D) shown in Table 3 was produced.
[0296] In the chemical composition of each steel grade in Table 1, the remainder other than the elements shown in Table 1 is Fe and impurities.
[0297] For levels 1 to 6, 8 to 9, 11 to 13, 15 to 24, and 27 to 28, hot rolling, isothermal transformation treatment, water cooling, and wire drawing under the conditions shown in Table 2 were sequentially applied to the billets to obtain Steel wires with diameters (D) as shown in Table 3 were used.
[0298] For levels 14, 25, and 26, the slabs were subjected to hot rolling under the conditions shown in Table 2, followed by air cooling, reheating at a heating temperature of 950°C, and lead under the conditions of a le...
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Provided is a steel wire for a non-heat treated machine part, said steel wire containing, by mass%, 0.40-0.65% C, 0.05-0.50% Si, 0.20-1.00% Mn, and 0.005-0.050% Al, with the remainder comprising Fe and impurities, wherein the metallographic structure contains at least (35*[C%]+65)% pearlite, and, if the diameter is taken as D, the average aspect ratio of the pearlite block at a depth of 50 [mu]m in an L cross-section is taken as AR, and the average block grain diameter of the pearlite block at a depth of 50 [mu]m in a C cross-section is taken as GD, the following conditions are satisfied: AR is at least 1.4; (AR) / (the average aspect ratio of the pearlite block at a depth of 0.25D in the L cross-section) is at least 1.1; GD does not exceed (15 / AR) [mu]m; and (GD) / (the average block grain diameter of the pearlite block at a depth of 0.25D in the C cross-section) is less than 1.0.
Description
technical field [0001] The present application relates to steel wires for non-quenched and tempered mechanical parts and non-quenched and tempered mechanical parts. Background technique [0002] In recent years, there has been an increasing demand for high-strength machine parts in the fields of various machines, such as automobiles, and construction, from the viewpoint of weight reduction and space saving. [0003] However, as the strength of high-strength mechanical parts increases, in particular, when the tensile strength of high-strength mechanical parts is 1100 MPa or more, it becomes easier to generate fractures caused by hydrogen embrittlement (that is, the resistance to hydrogen embrittlement changes). fall easily). [0004] As a method for improving the resistance to hydrogen embrittlement of high-strength machine parts, a method of forming a structure into pearlite structure and strengthening the structure by wire drawing is known, and many methods have been propo...
Claims
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Login to View More IPC IPC(8): C22C38/00C22C38/04C22C38/32C21D8/06C21D9/00C21D9/52
CPCC21D8/06C21D9/00C21D9/52C22C38/00C22C38/04C22C38/32C22C38/02C22C38/06
Inventor 小此木真平上大辅多田达诚
Owner NIPPON STEEL CORP