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A high-hardness and high-strength foldable stainless steel foil

A technology of stainless steel foil and austenitic stainless steel, which is applied in the field of high-hardness and high-strength foldable stainless steel foil

Active Publication Date: 2022-03-29
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, so far, there are few public reports on high-hardness and high-strength foldable stainless steel foil and its preparation technology

Method used

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  • A high-hardness and high-strength foldable stainless steel foil
  • A high-hardness and high-strength foldable stainless steel foil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A solid solution austenitic stainless steel sheet with a thickness of 1.0 mm is used as a raw material, and rolled into a steel foil with a thickness of 0.035 mm by 4 passes. The composition of the stainless steel sheet is shown in Table 1, the grain size grade number G=6, the alloy composition is the mass fraction, and the calculation of M D30 / 50 ≈35.6°C, calculate γ SF =18.74mJ / m 2 . Test martensite content V M =64.8%, austenite content V A = 35.2%. The measured 6-point Vickers hardness is: HV595, HV571, HV 601, HV 587, HV 579, HV 602, the average hardness is HV589, and the converted tensile strength is 2050Mpa. The measured bending radius R is about 4mm, the bending angle is ~173°, and the number of folds is ≥210,000 without breaking.

Embodiment 2

[0021] A solid solution austenitic stainless steel sheet with a thickness of 0.5 mm is used as raw material, and rolled into a steel foil with a thickness of 0.025 mm after 5 passes. The composition of the stainless steel sheet is shown in Table 1, the grain size grade number G=7, and the alloy composition is mass score, calculate M D30 / 50 ≈35.3°C, calculate γ SF =19.24mJ / m 2 . Test martensite content V M =62.3%, austenite content V A = 37.7%. The measured 6-point Vickers hardness is: HV589, HV588, HV 585, HV 583, HV 585, HV 590, the average hardness is HV586, and the converted tensile strength is 2040MPa. The measured bending radius R is about 2.4mm, the bending angle is ~174°, and the number of folding times is ≥210,000 without breaking.

Embodiment 3

[0023] The solid solution austenitic stainless steel sheet with a thickness of 0.5mm is used as raw material, and rolled into a steel foil with a thickness of 0.02mm after 5 passes. score, calculate M D30 / 50 ≈56.2°C, calculate γ SF =19.06mJ / m 2 . Test martensite content V M =72.4%, austenite content V A = 27.6%. The measured 6-point Vickers hardness is: HV 602, HV 599, HV 601, HV 603, HV 601, HV 602, the average hardness is HV 601, and the converted tensile strength is 2100MPa. It is measured that when the bending radius R is about 2mm, the bending angle is ~172°, and the number of folds is ≥210,000 times without breaking.

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Abstract

A high-hardness and high-strength foldable stainless steel foil belongs to the technical field of stainless steel foil. Austenitic stainless steel sheet as raw material, alloy composition range mass percentage: 0.1%≤C+N≤0.2%, 6%≤Ni+Cu≤8%, 0.5%≤Mn≤1.5%, 16%≤Cr≤18% , 0.01%≤Mo≤0.03%, 0.3%≤Si≤1%, the balance is Fe; based on M D30 / 50 and stacking fault energy γ SF The formula is adjusted within the above composition range, and a stainless steel foil product with a martensite ratio of 50%-80% is obtained through 3-7 passes of rolling and annealing. The thickness of the steel foil is between 15μm and 50μm, the hardness is ≥580HV, and the tensile strength is ≥1800MPa; the bending angle can reach ≥170°, the bending radius R can reach 1.5mm-8mm, and the folding times ≥200,000 without breaking.

Description

technical field [0001] The invention belongs to the technical field of stainless steel foil, and in particular provides a high-hardness and high-strength foldable stainless steel foil with a thickness of not less than 15 μm and not more than 50 μm. Background technique [0002] With the rapid development of modern high-end manufacturing, high-end products require more precision, high integration, lightweight and high performance, requiring thinner foils and better performance, such as spring shrapnel, gaskets, precision parts, etched parts, Photoelectric protection cable, thermostat, automobile expansion valve diaphragm, elastic clockwork, precision electronics, auto parts, camera parts, air-conditioning pressure switch membrane, electronic appliances, metal stamping parts, air compressor shrapnel, injection needle piston ring expansion There is a wide range of application requirements for high-hardness, high-strength, foldable and resilient stainless steel foil in many fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C22C38/44C22C38/02C22C38/04C22C38/00C21D8/02
CPCC22C38/42C22C38/44C22C38/02C22C38/04C22C38/001C21D8/0205C21D8/0247C21D2211/008C21D2211/001
Inventor 孟利张宁杨勇
Owner CENT IRON & STEEL RES INST