JPWO2021240740A5 - - Google Patents
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- JPWO2021240740A5 JPWO2021240740A5 JP2022527408A JP2022527408A JPWO2021240740A5 JP WO2021240740 A5 JPWO2021240740 A5 JP WO2021240740A5 JP 2022527408 A JP2022527408 A JP 2022527408A JP 2022527408 A JP2022527408 A JP 2022527408A JP WO2021240740 A5 JPWO2021240740 A5 JP WO2021240740A5
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- 238000005496 tempering Methods 0.000 claims description 18
- 238000004519 manufacturing process Methods 0.000 claims description 14
- 239000000126 substance Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 229910000639 Spring steel Inorganic materials 0.000 claims description 4
- 238000000113 differential scanning calorimetry Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 238000005482 strain hardening Methods 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Description
（１）本発明の一態様に係るばね用鋼線は、質量％で、化学成分として、Ｃ：０．５０％超０．６０％以下、Ｓｉ：１．００～３．００％、Ｍｎ：０．１０～１．５０％、Ｃｒ：０．１５～１．２０％、Ａｌ：０．００１～０．０５０％、Ｐ：０．０１５％以下、Ｓ：０．０１５％以下、Ｔｉ：０．０１０～０．１００％、Ｂ：０．００１０～０．００６０％、及びＮ：０．００７０％以下、を含有し、残部がＦｅ及び不純物からなり、ＴｉとＮの含有量が、式１を満足し、長手方向に垂直に切断した断面において、中心および表面の両方から等距離にある地点の金属組織が焼戻しマルテンサイト組織であり、５０℃から６００℃までの温度範囲を０．２５℃／ｓで昇温して示差走査熱量を測定することにより得られる発熱反応のピークのうち４５０℃以下の領域の面積が、発熱反応のピークの全ピーク面積の３０％以下である。
［Ｔｉ］≧３．５×［Ｎ］・・・（式１）
式１において、［Ｔｉ］と［Ｎ］には、ＴｉとＮの質量％での前記含有量が代入される。
（２）上記（１）に記載のばね用鋼線は、さらに、質量％で、前記化学成分として、Ｍｏ：０～１．００％、Ｎｉ：０～１．００％、Ｃｕ：０～１．００％Ｎｂ：０～０．１００％、Ｖ：０～０．５０％Ｓｂ：０～０．０５０％の１種または２種以上を含有してもよい。
（３）本発明の別の態様に係るばねは、上記（１）又は（２）に記載の化学成分を有するばねであって、５０℃から６００℃までの温度範囲を０．２５℃／ｓで昇温して示差走査熱量を測定することにより得られる発熱反応のピークのうち４５０℃以下の領域の面積が、発熱反応のピークの全ピーク面積の３０％以下である。
（４）本発明の別の態様に係るばね用鋼線の製造方法は、上記（１）又は（２）に記載のばね用鋼線の製造方法であって、上記（１）又は（２）に記載の化学成分からなる線材を、８５０～１０５０℃に加熱して焼入れ処理する工程と、焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理する工程と、を備える。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２）
（５）本発明の別の態様に係るばねの製造方法は、上記（３）に記載のばねの製造方法であって、上記（１）又は（２）に記載の化学成分からなる線材を、ばね形状に冷間加工する工程と、８５０～１０５０℃に加熱して焼入れ処理をする工程と、焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理を行う工程とを備える。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２）
（６）本発明の別の態様に係るばねの製造方法は、上記（３）に記載のばねの製造方法であって、上記（１）又は（２）に記載の化学成分からなる線材を、８５０～１０５０℃に加熱してばね形状に熱間加工する工程と、前記ばね形状を有する線材を焼入れ処理する工程と、焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理をする工程と、を備える。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２）
（７）本発明の別の態様に係るばねの製造方法は、上記（１）又は（２）に記載のばね用鋼線にばね加工をする工程を備える。
(1) A spring steel wire according to an aspect of the present invention has, in terms of mass%, chemical components of C: more than 0.50% and 0.60% or less, Si: 1.00 to 3.00%, Mn: 0.10-1.50%, Cr: 0.15-1.20%, Al: 0.001-0.050 %, P: 0.015% or less, S: 0.015% or less, Ti: 0 .010 to 0.100%, B: 0.0010 to 0.0060%, and N: 0.0070% or less, the balance being Fe and impurities, and the content of Ti and N is determined by the formula 1 is satisfied, and in the cross section cut perpendicular to the longitudinal direction, the metal structure at points equidistant from both the center and the surface is the tempered martensite structure, and the temperature range from 50 ° C to 600 ° C is 0.25 ° C. The area of the region of 450° C. or lower among the peaks of the exothermic reaction obtained by measuring the differential scanning calorimetry by raising the temperature at a rate of 1/s is 30% or less of the total peak area of the peaks of the exothermic reaction.
[Ti]≧3.5×[N] (Formula 1)
In Formula 1, [Ti] and [N] are substituted with the above contents in mass % of Ti and N.
(2) The steel wire for spring according to (1) above further includes, in mass %, the chemical components of Mo: 0 to 1.00%, Ni: 0 to 1.00%, and Cu: 0 to 1. .00% Nb: 0 to 0.100%, V: 0 to 0.50% Sb: 0 to 0.050%, one or more of these may be contained.
(3) A spring according to another aspect of the present invention is a spring having the chemical composition described in (1) or (2) above, wherein the temperature range from 50 ° C. to 600 ° C. is 0.25 ° C./s The area of the exothermic reaction peak at 450° C. or below obtained by measuring the differential scanning calorimetry by raising the temperature at 30% or less of the total peak area of the exothermic reaction peak.
(4) A method for producing a steel wire for spring according to another aspect of the present invention is the method for producing a steel wire for spring according to (1) or (2) above, wherein A step of heating and quenching the wire made of the chemical composition described in 850 to 1050 ° C., tempering temperature T [K], tempering time t [s], and C content C% [mass%] and and a step of tempering under the condition that the Cr content C% [mass %] satisfies Equation 2.
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
(5) A method for manufacturing a spring according to another aspect of the present invention is the method for manufacturing a spring according to (3) above, wherein the wire rod made of the chemical composition according to (1) or (2) above is A step of cold working into a spring shape, a step of quenching by heating to 850 to 1050 ° C., tempering temperature T [K], tempering time t [s], and C content C% [mass%] and Cr content C % [mass %] satisfies Equation 2, and tempering is performed.
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
(6) A method for manufacturing a spring according to another aspect of the present invention is the method for manufacturing a spring described in (3) above, wherein a wire rod comprising the chemical composition described in (1) or (2) above is A step of heating to 850 to 1050 ° C. and hot working into a spring shape, a step of quenching the wire having the spring shape, tempering temperature T [K], tempering time t [s], and C content C % [mass %] and Cr content C % [mass %] satisfies Equation 2, and a step of tempering.
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
(7) A method for manufacturing a spring according to another aspect of the present invention comprises the step of subjecting the spring steel wire according to (1) or (2) to spring processing.
Claims (7)
Ｃ：０．５０％超０．６０％以下、
Ｓｉ：１．００～３．００％、
Ｍｎ：０．１０～１．５０％、
Ｃｒ：０．１５～１．２０％、
Ａｌ：０．００１～０．０５０％、
Ｐ：０．０１５％以下、
Ｓ：０．０１５％以下、
Ｔｉ：０．０１０～０．１００％、
Ｂ：０．００１０～０．００６０％、及び
Ｎ：０．００７０％以下、
を含有し、残部がＦｅ及び不純物からなり、
ＴｉとＮの含有量が、式１を満足し、
長手方向に垂直に切断した断面において、中心および表面の両方から等距離にある地点の金属組織が焼戻しマルテンサイト組織であり、
５０℃から６００℃までの温度範囲を０．２５℃／ｓで昇温して示差走査熱量を測定することにより得られる発熱反応のピークのうち４５０℃以下の領域の面積が、発熱反応のピークの全ピーク面積の３０％以下である
ことを特徴とするばね用鋼線。
［Ｔｉ］≧３．５×［Ｎ］ ・・・（式１）
式１において、［Ｔｉ］と［Ｎ］には、ＴｉとＮの質量％での前記含有量が代入される。 In mass %, as a chemical component,
C: more than 0.50% and 0.60% or less,
Si: 1.00 to 3.00%,
Mn: 0.10-1.50%,
Cr: 0.15-1.20%,
Al: 0.001 to 0.050 %,
P: 0.015% or less,
S: 0.015% or less,
Ti: 0.010 to 0.100%,
B: 0.0010 to 0.0060%, and N: 0.0070% or less,
and the balance consists of Fe and impurities,
The content of Ti and N satisfies Equation 1,
In a cross section cut perpendicular to the longitudinal direction, the metal structure at a point equidistant from both the center and the surface is the tempered martensite structure,
Among the peaks of the exothermic reaction obtained by measuring the differential scanning calorimetry by increasing the temperature from 50°C to 600°C at a rate of 0.25°C/s, the area of the region below 450°C is the peak of the exothermic reaction. 30% or less of the total peak area of the spring steel wire.
[Ti]≧3.5×[N] (Formula 1)
In Formula 1, [Ti] and [N] are substituted with the above contents in mass % of Ti and N.
Ｍｏ：０～１．００％、
Ｎｉ：０～１．００％、
Ｃｕ：０～１．００％
Ｎｂ：０～０．１００％、
Ｖ：０～０．５０％
Ｓｂ：０～０．０５０％
の１種または２種以上を含有することを特徴とする請求項１に記載のばね用鋼線。 Furthermore, in mass%, as the chemical component,
Mo: 0 to 1.00%,
Ni: 0 to 1.00%,
Cu: 0-1.00%
Nb: 0 to 0.100%,
V: 0-0.50%
Sb: 0-0.050%
The steel wire for a spring according to claim 1, characterized by containing one or more of
５０℃から６００℃までの温度範囲を０．２５℃／ｓで昇温して示差走査熱量を測定することにより得られる発熱反応のピークのうち４５０℃以下の領域の面積が、発熱反応のピークの全ピーク面積の３０％以下であることを特徴とするばね。 A spring having the chemical composition according to claim 1 or 2,
Among the peaks of the exothermic reaction obtained by measuring the differential scanning calorimetry by increasing the temperature from 50°C to 600°C at a rate of 0.25°C/s, the area of the region below 450°C is the peak of the exothermic reaction. 30% or less of the total peak area of the spring.
請求項１又は２に記載の化学成分からなる線材を、８５０～１０５０℃に加熱して焼入れ処理する工程と、
焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理する工程と、
を備えるばね用鋼線の製造方法。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２） A method of manufacturing the steel wire for spring according to claim 1 or 2, wherein the wire rod composed of the chemical composition according to claim 1 or 2 is heated to 850 to 1050° C. and quenched;
A step of tempering under conditions where the tempering temperature T [K], the tempering time t [s], the C content C% [mass%], and the Cr content C% [mass%] satisfy Equation 2; ,
A method for manufacturing a steel wire for a spring.
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
請求項１又は２に記載の化学成分からなる線材を、ばね形状に冷間加工する工程と、
８５０～１０５０℃に加熱して焼入れ処理をする工程と、
焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理を行う工程と
を備えるばねの製造方法。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２） A method for manufacturing the spring according to claim 3,
a step of cold-working a wire comprising the chemical composition according to claim 1 or 2 into a spring shape;
A step of heating to 850 to 1050 ° C. and quenching;
Tempering temperature T [K], tempering time t [s], C content C% [mass%] and Cr content C% [mass%] satisfy formula 2. A step of performing tempering treatment A method of manufacturing a spring comprising:
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
請求項１又は２に記載の化学成分からなる線材を、８５０～１０５０℃に加熱してばね形状に熱間加工する工程と、
前記ばね形状を有する線材を焼入れ処理する工程と、
焼戻し温度Ｔ［Ｋ］、焼戻し時間ｔ［ｓ］、並びにＣの含有量Ｃ％［質量％］及びＣｒの含有量Ｃ％［質量％］が式２を満足する条件で、焼戻し処理をする工程と、
を備えるばねの製造方法。
５８０００≦（Ｔ＋７００×［Ｃ％］＋５０×［Ｃｒ％］）×（５１．７＋ｌｏｇｔ）≦６２０００・・・（式２） A method for manufacturing the spring according to claim 3,
A step of hot-working a wire made of the chemical composition according to claim 1 or 2 to a spring shape by heating it to 850 to 1050° C.;
a step of quenching the wire having the spring shape;
A step of tempering under conditions where the tempering temperature T [K], the tempering time t [s], the C content C% [mass%], and the Cr content C% [mass%] satisfy Equation 2. When,
A method of manufacturing a spring comprising:
58000≦(T+700×[C%]+50×[Cr%])×(51.7+logt)≦62000 (Formula 2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2020/021159 WO2021240740A1 (en) | 2020-05-28 | 2020-05-28 | Spring steel wire, spring, and production method of same |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPWO2021240740A1 JPWO2021240740A1 (en) | 2021-12-02 |
| JPWO2021240740A5 true JPWO2021240740A5 (en) | 2022-09-15 |
| JP7260838B2 JP7260838B2 (en) | 2023-04-19 |
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ID=78723220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2022527408A Active JP7260838B2 (en) | 2020-05-28 | 2020-05-28 | Steel wire for spring, spring and method for producing them |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7260838B2 (en) |
| WO (1) | WO2021240740A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3577411B2 (en) * | 1997-05-12 | 2004-10-13 | 新日本製鐵株式会社 | High toughness spring steel |
| JP4451951B2 (en) * | 1999-12-20 | 2010-04-14 | 新日本製鐵株式会社 | Steel material for high strength springs |
| JP3764715B2 (en) * | 2002-10-22 | 2006-04-12 | 新日本製鐵株式会社 | Steel wire for high-strength cold forming spring and its manufacturing method |
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2020
- 2020-05-28 WO PCT/JP2020/021159 patent/WO2021240740A1/en active Application Filing
- 2020-05-28 JP JP2022527408A patent/JP7260838B2/en active Active
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