Steel for mechanical structures and induction hardened steel parts
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A mechanical structure and high-frequency quenching technology, which is applied in the fields of high-frequency hardened steel parts, mechanical structural steel and high-frequency hardened steel parts, can solve the problems of decreased hardenability, difficulty in completing the transformation to austenite, and unclear , to achieve excellent surface fatigue strength, excellent machinability and quality improvement
Inactive Publication Date: 2018-06-08
NIPPON STEEL CORP
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Patent Document 3 shows that the machinability of the steel for induction hardening is improved, but since no comparative study of the machinability of the steel of the invention and that of the case-hardened steel has been conducted, whether it is possible to obtain a steel that is as good as that of the case-hardened steel Machinability is not clear
In addition, in Patent Document 3, since the Al content needs to be set to exceed 0.100%, it is difficult to complete the transformation to austenite during high-frequency heating, and there is a possibility that the hardenability may be lowered.
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[0139] The present invention will be described in detail below through examples. The conditions in the examples are one example of conditions employed to confirm the feasibility and effects of the present invention, and the present invention is not limited to this one example of conditions. As long as the object of the present invention can be achieved without departing from the gist of the present invention, various conditions can be employed in the present invention.
[0140] Steel materials No.a to ii having the chemical compositions shown in Table 1 and Table 2 were melted in a 270-ton converter, and continuously casted using a continuous casting machine to manufacture a 220×220 mm square billet. Pressing is applied at a stage in the middle of solidification of continuous casting. In the continuous casting of the slab, the average cooling rate in the temperature range from the liquidus temperature to the solidus temperature at a position at a depth of 15 mm from the surfa...
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Abstract
The chemical components of this steel for mechanical structures include, in mass%, C: 0.40 to 0.70%, Si: 0.15 to 3.00%, Mn: 0.30 to 2.00%, Cr: 0.01% or more but less than 0.50%, S: 0.003 to 0.070%, Bi: more than 0.0001% but not more than 0.0050%, N: 0.0030 to 0.0075%, Al: 0.003 to 0.100%, P: 0.050% or less, and B, Mo, Ni, Cu, Ca, Mg, Zr, Rem, Ti, Nb, V, Sb, Te, and Pb as necessary, the balance being Fe and impurities. Both 290*C + 50*Si + 430>=620 and d + 3sigma<20 are satisfied. In a cross section parallel to the longitudinal direction, the density of MnS having an equivalent circle diameterof less than 2.0 mu m is 300 / mm2 or more.
Description
technical field [0001] The present invention relates to structural steel and high-frequency quenched steel parts, and in particular to power transmission parts (such as gears, bearings, CVT pulleys, shafts, etc.) Induction hardened steel parts used in, etc.) and mechanical structural steel as its raw material. [0002] this application claims priority based on Japanese Patent Application No. 2015-205631 for which it applied in Japan on October 19, 2015, and uses the content here. Background technique [0003] In the past, power transmission parts such as gears were often used after surface hardening treatment. As a surface hardening method, carburizing, nitriding, or induction hardening is used. Among them, "carburizing" is a method of hardening the surface by carbonizing the surface layer of a material with high toughness in the base (base material), and it is mainly used in gears and CVTs for automobiles in order to improve fatigue strength (surface fatigue strength). O...
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