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Age-hardening steel

A technology of age hardening and hardness, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of cutting resistance and poor tool life

Active Publication Date: 2015-12-16
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, among machinability, the higher the hardness of the raw material, the lower the cutting resistance and tool life tend to be.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0146] Steels A to AG having the chemical compositions shown in Table 1 and Table 2 were melted in a 50 kg vacuum melting furnace.

[0147]Steels A to W in Table 1 and Table 2 are steels whose chemical compositions are within the range specified by the present invention. On the other hand, steels X to AG in Table 2 are steels whose chemical compositions deviate from the conditions specified in the present invention.

[0148] It should be noted that "<0.001" in the column of Ti indicates that the content of Ti as an impurity is less than 0.001%.

[0149] [Table 1]

[0150]

[0151] [Table 2]

[0152]

[0153] The ingots of the respective steels were heated at 1250° C., and then hot forged into steel bars with a diameter of 60 mm. Each hot-forged steel bar was left to cool in the atmosphere and cooled to room temperature. Then, it was further heated to 1250°C for 30 minutes, assumed to be forged into a part shape, and the surface temperature of the forged material at t...

Embodiment 2

[0177] A part of steel bars with a diameter of 60 mm of steel P and steel Y produced in Example 1 by hot forging and cooling to room temperature were cut out. The cut steel bar was further heated to 1250°C for 30 minutes, and was forged into a component shape assuming that the surface temperature of the forged material during finishing was 950-1100°C, and hot forged into a steel bar with a diameter of 35mm. After the hot forging, it was cooled to a temperature of 400° C. or lower by letting it cool in the air, or using a blower and a liquid mist (mist) at various cooling rates.

[0178] With regard to each test number, the hardness before aging treatment was measured using a part of steel bars that were finished by hot forging to the above-mentioned diameter of 35 mm and then cooled to 400° C. or lower using a blower and a liquid sprayer. temperature, thereby cooling the room temperature.

[0179] On the other hand, with respect to each test number, aging treatment was perfor...

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Abstract

The invention provides age-hardening steel having a chemical composition containing 0.05 to 0.20% of C, 0.01 to 0.50% of Si, 1.5 to 2.5% of Mn, 0.005 to 0.08% of S, 0.03 to 0.50% of Cr, 0.005 to 0.05% of Al, 0.25 to 0.50% of V, 0 to 1.0% of Mo, 0 to 0.3% of Cu, 0 to 0.3% of Ni, 0 to 0.005% of Ca, 0 to 0.4% of Bi and a remainder made up by Fe and impurities, wherein the following formulae P <= 0.03%, Ti < 0.005% and N < 0.0080% are satisfied in the impurities, and the following formulae [C+0.3Mn+0.25Cr+0.6Mo >= 0.68], [C+0.1Si+0.2Mn+0.15Cr+0.35V+0.2Mo <= 0.85] and [-4.5C+Mn+Cr-3.5V-0.8Mo >= 0.00] are satisfied. The age-hardening steel has hardness of 290 HV or less before being subjected to an aging treatment, also has an amount of hardening of 25 HV or more and fatigue strength of 350 MPa or more when subjected to an aging treatment, and also has an absorption energy of 16 J or more at 20 DEG C after being subjected to an aging treatment as evaluated by a Charpy impact test that is carried out using a U-notched standard test specimen having a notch depth of 2 mm and a notch root radius of 1 mm. Therefore, the age-hardening steel is extremely suitable as a material for machine parts.

Description

technical field [0001] The present invention relates to age hardenable steels. More specifically, the present invention relates to age hardening treatment (hereinafter simply referred to as "aging treatment") after being processed into a predetermined shape by hot forging and cutting, and the desired strength and toughness can be ensured by this aging treatment, and extremely Steel suitable for use as a raw material for manufacturing machine parts such as automobiles, industrial machines, and construction machines. Background technique [0002] From the standpoint of higher engine output and weight reduction aimed at improving fuel efficiency, mechanical parts such as automobiles, industrial machinery, and construction machinery are required to have high fatigue strength. If only high fatigue strength is provided to steel, it can be easily achieved by increasing the hardness of steel by using alloying elements and / or heat treatment. However, the above-mentioned mechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/60C21D8/06
CPCC21D1/06C21D1/18C21D8/06C21D9/0075C21D2211/002C22C38/001C22C38/002C22C38/02C22C38/06C22C38/20C22C38/22C22C38/24C22C38/28C22C38/38C22C38/42C22C38/44C22C38/46C22C38/50C22C38/58C22C38/60
Inventor 祐谷将人东田真志松本齐长谷川达也根石丰牧野泰三
Owner NIPPON STEEL CORP
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