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High strength spring steel having excellent hydrogen embrittlement resistance

A high-strength, spring steel technology, used in low internal friction springs, springs/shock absorbers, heat treatment equipment, etc., can solve problems such as difficulty in achieving hydrogen embrittlement resistance, and achieve low alloying elements and excellent recyclability. Effect

Inactive Publication Date: 2008-08-13
KOBE STEEL LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if the precipitation form of the precipitate is controlled, the improvement of the hydrogen storage capacity is still limited, and it is difficult to achieve more excellent hydrogen embrittlement resistance

Method used

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  • High strength spring steel having excellent hydrogen embrittlement resistance

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Experimental program
Comparison scheme
Effect test

Embodiment

[0096] After smelting No.A to P steel materials composed of the composition listed in Table 1, a 115 mm square billet was produced by forging, and rolled to Afterwards, the drawing process achieves Heat treatment (tempering) was performed after cutting this wire-drawn material into lengths of 300 mm. The heat treatment, in (A 3 point + 30°C) for 5 minutes, then cooled to To°C in Table 2 at 10°C / s, and kept at this temperature (To°C) for t seconds as shown in Table 2, after which naturally cooled spring steel was obtained.

[0097] The metal structure, tensile strength (TS), elongation [full extension (E1)], hydrogen embrittlement resistance, and fatigue properties of each spring steel thus obtained were investigated in the following manner.

[0098] [Observation of metal structure]

[0099] In the measurement area (approximately 50 μm × 50 μm, measurement interval: 0.1 μm) at any position in the cross-section of the obtained sample at the position of 1 / 2 radius, the baini...

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Abstract

The present invention provides a high strength steel used for spring steel that has excellent hydrogen embrittlement resistance. The high strength steel which spring steel having excellent hydrogen embrittlement resistance comprises 0.20 to 0.60% of C, 1.0 to 3.0% of Si, 1.0 to 3.5% of Mn, higher than 0% and not higher than 1.5% of Al, 0.15% or less P, 0.02% or less S, and balance of iron and inevitable impurities and the structure includes: 1% or more residual austenite; 80% or more in total of bainitic ferrite and martensite; and 10% or less (may be 0%) in total content of ferrite and pearlite in the proportion of area to the entire structure, and also the mean axis ratio (major axis / minor axis) of the residual austenite grains is 5 or higher and the steel tensile strength is 1860 MPa or higher.

Description

technical field [0001] The present invention relates to a high-strength spring steel excellent in resistance to hydrogen embrittlement, and in particular to a high-strength spring steel capable of suppressing hydrogen embrittlement, self-generated cracks, and delayed failure, which are problems in spring steel having a tensile strength of 1860 MPa or more. Background technique [0002] The chemical composition of spring steel used for high-strength springs such as valve springs of automobile engines and suspension springs of suspensions is specified as JIS G 3565-3567 and JIS G 4801. After hot-rolling the steel that meets the composition composition, Wire drawing is performed to reach the specified wire diameter, and then spring processing is performed after oil tempering (cold coiled spring), or after wire drawing is performed on a rolled material, it is heated to form a spring, and then quenched and tempered (hot coiled spring) spring), thus producing the spring. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C21D8/06C21D11/00F16F1/02
Inventor 汤濑文雄齐藤贤司池田周之杉本公一
Owner KOBE STEEL LTD
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