High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same

A technology of heat deformation resistance and manufacturing method, applied in the direction of manufacturing tools, low internal friction springs, springs/shock absorbers, etc., to achieve high strength heat deformation resistance, excellent heat deformation resistance, and promote the formation of fine compounds Effect

Active Publication Date: 2014-11-05
NIPPON STEEL STAINLESS STEEL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The problem to be solved by the present invention is to provide materials with sufficient high strength characteristics and High-stre

Method used

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  • High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same
  • High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same
  • High-strength stainless steel wire having excellent heat deformation resistance, high-strength spring, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] "Manufacturing of Stainless Steel Wire"

[0127] Table 1 and Table 2 show the chemical components of the stainless steels used in the examples, and also describe the comparative steels. In both Tables 1 and 2, numerical values ​​outside the range specified in this embodiment are underlined.

[0128]

[0129]

[0130] The steels with these chemical compositions are melted in a vacuum melting furnace, cast into a billet of φ178mm, and the billet is made into a bar steel of φ62mm by hot forging. Next, it was heated to 1250° C. and extruded using a hot extrusion simulator to produce a wire rod with a diameter of 10.7 mm. After that, solution treatment and pickling are performed, and the wire is drawn to φ5.5mm to make a wire rod.

[0131]Then, this was processed into a soft wire having a wire diameter of 2.2 mm while repeatedly performing cold drawing processing and solution heat treatment as a raw material. Next, a hard thin wire (drawn wire rod) having a wire dia...

Embodiment 2

[0140] "Verification of aging characteristics"

[0141] Next, in order to evaluate the change in properties caused by the aging heat treatment of the stainless steel wires (drawn wire rods) of Example 1, each stainless steel wire (drawn wire rod) in Example 1 after the final wire drawing process was cut into A sample was obtained with a length of 150 mm. Then, aging heat treatment was performed on the sample at 500° C. for 30 minutes. The aging heat treatment factor represented by the formula (3) is 612.

[0142] Then, the tensile strength, yield strength, yield ratio, number of torsion values, and rigid modulus of the stainless steel wire (drawn wire, aging heat-treated material) after the aging heat treatment were evaluated. The results are shown in Table 5 and Table 6. In addition, the rigidity modulus was evaluated using the torsion pendulum method.

[0143] table 5

[0144]

[0145] Table 6

[0146]

[0147] Underline: outside the scope of this embodiment

[...

Embodiment 3

[0151] "Verification of Spring Products"

[0152] Then, in order to further verify the effect of Example 2, each stainless steel wire (drawing wire) before the aging heat treatment is implemented to be coiled, forming a coil with an average diameter of 7mm, an effective number of coils of 4.5 turns, and a spring free length of 25mm, compressed coil spring with an expanded length of 100mm. Next, aging heat treatment was performed at 500° C. for 30 minutes. Then, the heat deformation resistance of the actual spring product was evaluated. The heat deformation resistance (residual shear strain ε) was measured by the method described in the above-mentioned "Manufacturing method of a spring product". Specifically, it was held at 200° C. for 96 hours while maintaining a state where a compressive stress of 600 MPa was applied. Then, the residual shear strain ε was calculated using formula (7).

[0153] The obtained results are shown in Table 5 and Table 6. It was confirmed that t...

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Abstract

This high-strength stainless steel wire contains, by mass percent, C (0.02-0.12%), N (0.005-0.03%), where 0.05% <= (C + N) <= 0.13%, Si (0.1-2.0%), Mn (0.1-2.0%), Ni (6.8-9.0%), Cr (12.0-14.4%), Mo (1.0-3.0%), and Al (0.5-2.0%), the remainder being Fe and unavoidable impurities; the generated index MdS value for deformation-induced martensite being 15-60, the amount of deformation-induced martensite being 80-99 vol%, and tensile strength being 1800-2200 MPa. MdS = 551 - 462 (C + N) - 9.2 Si - 8.1 Mn - 29 (Ni + Cu) - 13.7 Cr - 18.5 Mo

Description

technical field [0001] The present invention relates to a high-strength stainless steel wire used as a heat-resistant steel wire material for heat-resistant springs, heat-resistant cables, etc., for parts requiring heat resistance and high strength, such as automobile engine exhaust system parts and electrical parts. The present invention relates to a high-strength stainless steel wire of a precipitation-hardened metastable austenite system having a metal structure of austenite (γ) phase + deformation-induced martensite (α') phase, adding Mo, Al, etc. and performing cold working And aging heat treatment to control fine precipitates. In particular, the present invention relates to a high-strength heat-resistant stainless steel wire, a high-strength spring using the high-strength heat-resistant stainless steel wire, and particularly to a high-strength heat-resistant spring and a manufacturing method thereof. [0002] This application claims priority based on Japanese Patent App...

Claims

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Application Information

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IPC IPC(8): C22C38/00B21C1/00C21D8/06C21D9/02C22C38/58F16F1/02
CPCC22C38/04C22C38/002C21D9/52C22C38/02C21D9/02C22C38/46C22C38/48C22C38/00C22C38/42C22C38/44C21D8/065C22C38/06C21D6/004C22C38/50B21C1/003B21C37/04C21D2211/008C22C38/58
Inventor 东城雅之高野光司梶村治彦饱浦常夫豊田豪
Owner NIPPON STEEL STAINLESS STEEL CORP
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