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Steel product for induction hardening, induction-hardened member using the same, and methods for producing them

A technology of high-frequency quenching and manufacturing methods, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., and can solve problems such as not considering machinability, shortened life of cutting tools, and problems with machinability

Inactive Publication Date: 2006-07-12
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in JP-A-2000-154819 and JP-8-53714, machinability is not considered at all.
In fact, when the steel described in these publications is cut, the life of the cutting tool is shortened, and there are problems with machinability.

Method used

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  • Steel product for induction hardening, induction-hardened member using the same, and methods for producing them
  • Steel product for induction hardening, induction-hardened member using the same, and methods for producing them

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] No. 1-31 steels having the composition shown in Table 1 were smelted by a converter, and formed into billets with a cross-sectional size of 300×400 mm by continuous casting. After the billet is rolled into a 150 mm square billet through the billet opening process, it is rolled into a bar steel of 24-60 mmφ according to the hot working conditions shown in Table 2.

[0071] Select a rotating bending fatigue test piece with a diameter of 8mmφ at the parallel part from the steel bar, and use an induction quenching device with a frequency of 15kHZ for the test piece and quench it under the induction quenching conditions shown in Table 2-1 and Table 2-2 Thereafter, a tempering treatment at 170° C.×30 m was performed to manufacture a sample of No. 1-43 steel material. For these samples, an Ono-type rotational bending tester was used to change the stress conditions at a rotational speed of 3000 rpm to conduct a rotational bending fatigue test, and the measured life was 1×10 8 ...

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PUM

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Abstract

A steel product for induction hardening which has a chemical composition in mass % that C: 0.3 to 0.7 %, Si: 1.1 % or less, Mn: 0.2 to 1.1 %, Mo: 0.05 to 0.6, S: 0.06 % or less, P: 0.025 % or less, Al: 0.25 % or less, Cr: 0.3 % or less and the balance: Fe and inevitable impurities, has a ferrite structure and a pearlite structure, wherein the sum of the ferrite structure and the pearlite structure accounts for 90 volume % or more of the steel product, the ferrite structure has a thickness of 30 mum or less, and a hardened layer after induction hardening has an average old austenite grain diameter of 12 mum or less. The above steel product is improved in the easiness to be machined and exhibits excellent fatigue strength, and thus is suitable for a drive shaft and a constant-velocity universal joint.

Description

technical field [0001] The present invention relates to steel materials for induction hardening suitable for use in propeller shafts and constant velocity joints of automobiles in which a hardened layer is formed on the surface layer by induction hardening, induction hardened parts using the steel materials, and their manufacturing methods. Background technique [0002] Conventionally, hot forging is usually performed on hot-rolled bar steel, and further cutting and cold forging are performed on mechanical structural parts such as propeller shafts, constant velocity joints, crankshafts, input shafts, output shafts, gears, and hubs of automobiles. After being processed into a predetermined shape, it is subjected to induction hardening-tempering to impart fatigue strengths such as torsional fatigue strength, bending fatigue strength, rolling fatigue characteristics, and sliding-rolling fatigue strength, which are important properties for mechanical structural parts. [0003] I...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/00C21D9/28
Inventor 松崎明博大森靖浩黑泽伸隆林透丰冈高明山田克美
Owner JFE STEEL CORP