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Steel for carburizing

A technology of quality and chemical composition, applied in the field of carburizing steel, can solve the problems of reducing and failing to achieve surface C concentration, and achieve the effect of improving manufacturing efficiency

Active Publication Date: 2015-09-02
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, the reduction of surface C concentration, which is effective for improving the impact value, cannot be achieved.

Method used

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  • Steel for carburizing
  • Steel for carburizing
  • Steel for carburizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0112] Next, examples of the present invention will be described, but the conditions in the examples are examples of conditions adopted for confirming the practicability and effects of the present invention, and the present invention is not limited to the examples of conditions. The present invention can adopt various conditions as long as it does not deviate from the gist of the present invention and achieves the object of the present invention.

[0113] Soaking treatment is performed after forging and stretching various steel billets having the chemical compositions shown in Table 1-1 and Table 1-2 into a square bar shape with a cross-sectional dimension of 50 mm in length and 50 mm in width (50 mm × 50 mm) in the longitudinal direction. After normalizing (normalizing), it was further divided into four square rod shapes with cross-sectional dimensions of 25 mm in length and 25 mm in width. The obtained rods were collected along their central axis from the figure 2 Shown is...

reference example 29

[0133] Reference Example 29 is the same steel as Comparative Example 26, but the carburizing conditions are different, and the carbon potential (carburizing treatment of 0.6) is set low, so it can be seen that the surface C concentration is low and a good impact value is obtained. However, setting the carbon potential low in actual production is not preferable since productivity decreases.

[0134] Table 1-1

[0135]

[0136] ※The symbol "-" in the table indicates that the element content is 0 or the amount regarded as an impurity.

[0137] Table 1-2

[0138]

[0139] ※The symbol "-" in the table indicates that the element content is 0 or the amount regarded as an impurity.

[0140] Table 2

[0141]

[0142] ※The carburizing conditions of Comparative Example 29 are different from other examples

[0143] Symbol Description

[0144] 1 Surface C concentration measurement area

[0145] 2 notches (notches)

[0146] 3 Charpy impact test piece (carburized material)

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Abstract

This steel has a chemical composition which contains, in mass%, 0.16-0.30% of C, 0.01-2.0% of Si, 0.35-1.45% of Mn, 0.05-3.0% of Cr, 0.001-0.2% of Al, 0.04-5.0% of Ni, 0.015%-1.0% of Sn, 0.004-0.05% of S, 0.003-0.03% of N, 0.005% or less of O, 0.025% or less of P, 0-1.0% of Mo, 0-1.0% of Cu, 0-0.005% of B, 0-0.3% of Nb, 0-0.3% of Ti, 0-1.0% of V, 0-0.01% of Ca, 0-0.01% of Mg, 0-0.05% of Zr, 0-0.1% of Te and 0-0.005% of a rare earth element, with the balance made up of Fe and impurities. If [Si%], [Ni%], [Al%] and [Sn%] are the contents of Si, Ni, Al and Sn in terms of mass%, the relation 42 ≥ 21 × [Si%] + 5 × [Ni%] + 40 × [Sn%] + 32 × [Al%] ≥ 8.5 is satisfied.

Description

technical field [0001] The present invention relates to carburizing steel capable of improving the impact resistance of various carburizing steel parts without adjusting carburizing conditions for each carburizing steel part. [0002] this application claims priority based on Japanese Patent Application No. 2012-288131 for which it applied in Japan on December 28, 2012, and uses the content here. Background technique [0003] There are cases where machine structural members are damaged due to sudden and large stress. In particular, in vehicle gears such as differential gears, transmission gears, and carburized shafts with gears, dedendums may be damaged by impact fracture due to loads during emergency start and emergency stop of the vehicle. In order to prevent this phenomenon, it is desired to further improve the shock value (shock resistance characteristic) of differential gears and transmission gears in particular. By sufficiently increasing the impact value of these pa...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D1/06C22C38/60
CPCC22C38/02C22C38/40C22C38/04C22C38/005C23C8/22C22C38/06C22C38/44C22C38/48C22C38/46C22C38/008C22C38/42C22C38/60C22C38/001C22C38/00C21D1/06C22C38/50C22C38/002C22C38/54C21D2211/004
Inventor 小山达也久保田学吉田卓
Owner NIPPON STEEL CORP
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