JP2008163423A - 疲労特性に優れたSiキルド鋼線材およびばね - Google Patents
疲労特性に優れたSiキルド鋼線材およびばね Download PDFInfo
- Publication number
- JP2008163423A JP2008163423A JP2006356308A JP2006356308A JP2008163423A JP 2008163423 A JP2008163423 A JP 2008163423A JP 2006356308 A JP2006356308 A JP 2006356308A JP 2006356308 A JP2006356308 A JP 2006356308A JP 2008163423 A JP2008163423 A JP 2008163423A
- Authority
- JP
- Japan
- Prior art keywords
- steel wire
- ppm
- wire rod
- killed steel
- inclusions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000655 Killed steel Inorganic materials 0.000 title claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 35
- 239000010959 steel Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 229910052720 vanadium Inorganic materials 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052803 cobalt Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 238000002844 melting Methods 0.000 abstract description 23
- 238000000034 method Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 description 33
- 229910052791 calcium Inorganic materials 0.000 description 22
- 229910052749 magnesium Inorganic materials 0.000 description 22
- 230000000694 effects Effects 0.000 description 20
- 229910052788 barium Inorganic materials 0.000 description 14
- 229910004298 SiO 2 Inorganic materials 0.000 description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 8
- 239000011521 glass Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound data:image/svg+xml;base64,PD94bWwgdmVyc2lvbj0nMS4wJyBlbmNvZGluZz0naXNvLTg4NTktMSc/Pgo8c3ZnIHZlcnNpb249JzEuMScgYmFzZVByb2ZpbGU9J2Z1bGwnCiAgICAgICAgICAgICAgeG1sbnM9J2h0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnJwogICAgICAgICAgICAgICAgICAgICAgeG1sbnM6cmRraXQ9J2h0dHA6Ly93d3cucmRraXQub3JnL3htbCcKICAgICAgICAgICAgICAgICAgICAgIHhtbG5zOnhsaW5rPSdodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rJwogICAgICAgICAgICAgICAgICB4bWw6c3BhY2U9J3ByZXNlcnZlJwp3aWR0aD0nMzAwcHgnIGhlaWdodD0nMzAwcHgnIHZpZXdCb3g9JzAgMCAzMDAgMzAwJz4KPCEtLSBFTkQgT0YgSEVBREVSIC0tPgo8cmVjdCBzdHlsZT0nb3BhY2l0eToxLjA7ZmlsbDojRkZGRkZGO3N0cm9rZTpub25lJyB3aWR0aD0nMzAwLjAnIGhlaWdodD0nMzAwLjAnIHg9JzAuMCcgeT0nMC4wJz4gPC9yZWN0Pgo8dGV4dCB4PSc5MS4xJyB5PScxNzAuMCcgY2xhc3M9J2F0b20tMCcgc3R5bGU9J2ZvbnQtc2l6ZTo0MHB4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO3RleHQtYW5jaG9yOnN0YXJ0O2ZpbGw6IzVCQjc3MicgPkg8L3RleHQ+Cjx0ZXh0IHg9JzExOC43JyB5PScxNzAuMCcgY2xhc3M9J2F0b20tMCcgc3R5bGU9J2ZvbnQtc2l6ZTo0MHB4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO3RleHQtYW5jaG9yOnN0YXJ0O2ZpbGw6IzVCQjc3MicgPkM8L3RleHQ+Cjx0ZXh0IHg9JzE0Ni4zJyB5PScxNzAuMCcgY2xhc3M9J2F0b20tMCcgc3R5bGU9J2ZvbnQtc2l6ZTo0MHB4O2ZvbnQtc3R5bGU6bm9ybWFsO2ZvbnQtd2VpZ2h0Om5vcm1hbDtmaWxsLW9wYWNpdHk6MTtzdHJva2U6bm9uZTtmb250LWZhbWlseTpzYW5zLXNlcmlmO3RleHQtYW5jaG9yOnN0YXJ0O2ZpbGw6IzVCQjc3MicgPmw8L3RleHQ+Cjwvc3ZnPgo= data:image/svg+xml;base64,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 Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 6
- 238000005098 hot rolling Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound data:image/svg+xml;base64,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 data:image/svg+xml;base64,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 [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 238000007711 solidification Methods 0.000 description 5
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[Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N nitric acid Chemical compound 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O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
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- 229910052745 lead Inorganic materials 0.000 description 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials 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[Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Abstract
【解決手段】本発明のSiキルド鋼線材は、Ba:0.03〜30ppm(「質量ppm」の意味、以下同じ)、Al:1〜30ppmおよびSi:0.2〜4%(「質量%」の意味、以下同じ)を夫々含有する他、Mgおよび/またはCaを合計で0.5〜30ppmの範囲で含むものであり、こうした鋼線材からばねを成形することによって、疲労特性に優れたばねが得られる。
【選択図】なし
Description
「第182・183回西山記念技術講座」、(社)日本鉄鋼協会編、第131〜134頁
Baは、介在物を複合化して低融化するためになくてはならない成分である。介在物中にBaOを含有させると、ガラスの安定性はあまり低下させずに、低融点化させる効果がある。また、Si濃度の高い鋼中に酸素との結合力の強いBaを含有させることで、凝固時に、著しくSiO2濃度の高い介在物が生成しても、ある程度の融点に保つ効果がある。これらの効果を発現するためには、最低でも0.03ppmのBaが必要である。好ましくは0.2ppm以上含有させるのが良い。一方、Ba濃度が高くなり過ぎると、介在物のほかの成分(Mg,Ca,Al,Si,Mn等)の濃度を下げ、最も融点が低くなる組成に制御できなくなる。従って、Ba濃度は30ppm以下とする必要があり、好ましくは10ppm以下とするのが良い。
Alは、Siキルド鋼の介在物組成を低融点化する効果がある。また、介在物中のCaOなどの濃度が高くなったときにガラス化を制御する効果もある。更に、Alは、Ca,Ba等と比べて鋼中に溶存しやすい成分であり、凝固時に著しくSiO2濃度の高い介在物が生成するのを抑制する効果が高い。これらの効果を発揮するためには、1ppm以上含有させる必要がある。しかしながら、Al含有量が高くなると、凝固時に純粋なAl2O3が生成する危険があるため、30ppm以下とする必要がある。尚、介在物の融点を最も下げる最適な組成に制御するためには、20ppm以下とすることが好ましい。
Siは、Siキルド鋼の製鋼時における主たる脱酸剤であり、本発明の線材を得るための必須の元素である。また高強度化にも寄与し、本発明の疲労特性向上効果が顕著にあらわれる点からも重要な元素である。更には、軟化抵抗を高め耐へたり性を向上させるのにも有用な元素である。こうした効果を発揮させるためには、Si含有量は0.2%以上(好ましくは2%以上)とする。しかしながら、Si含有量が過剰になると、凝固中に純粋なSiO2が生成する可能性があり、表面脱炭や表面疵が増加するため疲労特性が却って低下することになる。こうしたことから、Siは4%以下、好ましくは3%以下とする。
MgやCaは、介在物を最適な複合組成にし、低融点化するために必須の成分である。Ba単独、Mg単独、Ca単独、Al単独を含有させれば、高融点の介在物となる。従って、いずれかは必ず含有させる必要がある。また、MgやCaは酸素との親和力が強く、純粋なSiO2がまれに生成した場合に、それらを複合組成に改質しやすいという効果もある。これらの効果を発揮させるためには、MgやCa(Mg、Ca単独または併用)の含有量(併用する場合は合計含有量)は、0.5ppm以上とする必要がある。尚、好ましくは各元素を少なくとも0.1ppm以上(但し、合計含有量は0.5ppm以上)含有させて併用するのが良い。しかしながら、これらの元素が過剰になると、介在物中の他の成分の濃度が低くなり、最適な低融点組成が保てなくなる。従って、その上限は30ppm(好ましくは、20ppm以下)とする。
1)含有量が0.2ppm(mg/kg)以上の場合(定量下限値が0.2ppm)
対象となる線材から試料0.5gを採取してビーカーに取り、純水、塩酸および硝酸を加えて加熱分解した。放冷後、100mL(ミリリットル)のメスフラスコに移し入れ、測定溶液とした。この測定溶液を純水で希釈し、ICP質量分析装置(型式 SPQ8000:セイコーインスツルメント社製)を用い、BaおよびLiを定量分析した。
対象となる線材から試料0.5gを採取してビーカーに取り、純水、塩酸および硝酸を加えて加水分解を行った。その後塩酸を加えて酸濃度を調整し、メチルイソブチルケトン(MIBK)を加えて振とうし、鉄分をMIBK相に抽出した。静置後、水相のみを取り出し、100mLのメスフラスコに移し入れ、測定溶液とした。この測定溶液を純水で希釈し、ICP質量分析装置(型式 SPQ8000:セイコーインスツルメント社製)を用い、上記の条件でBaおよびLiを定量分析した。
各熱間圧延線材(直径:8.0mm)について、皮削り(直径:7.4mm)→パテンティング→冷間線引き加工(直径:4mm)→オイルテンパー[油焼入れと鉛浴(約450℃)焼戻し連続工程]にて直径4.0mm×650mmのワイヤを作製した。得られたワイヤについて、歪取焼鈍相当処理(400℃)→ショットピーニング→低温焼鈍200℃を行った後、中村式回転曲げ試験機を用いて、公称応力908MPa、回転数:4000〜5000rpm、中止回数:2×107回で試験を行った。そして、破断したもののうち介在物折損したものについて、下記式により破断率を求めた。
破断率(%)=[介在物折損本数/(介在物折損本数+所定回数に達し中止した本数)]×100
C:燃焼赤外線吸収法
Si,Mn,Ni,Cr,VおよびTi:ICP発光分光分析法
Al,Mg,ZrおよびREM:ICP質量分析法
Ca:フレームレス原子吸光分析法
O:不活性ガス融解法
Claims (6)
- Ba:0.03〜30ppm(「質量ppm」の意味、以下同じ)、Al:1〜30ppmおよびSi:0.2〜4%(「質量%」の意味、以下同じ)を夫々含有する他、Mgおよび/またはCaを合計で0.5〜30ppmの範囲で含むものであることを特徴とする疲労特性に優れたSiキルド鋼線材。
- Liを0.03〜20ppmの範囲で含むものである請求項1に記載のSiキルド鋼線材。
- C:1.2%以下(0%を含まない)、Mn:0.1〜2.0%を夫々含む鋼材からなるものである請求項1または2に記載のSiキルド鋼線材。
- 更に、Cr,Ni,V,Nb,Mo,W,Cu,Ti,Coおよび希土類元素よりなる群から選択される1種以上の元素を含有するものである請求項3に記載のSiキルド鋼線材。
- 残部がFeおよび不可避不純物である請求項3または4に記載のSiキルド鋼線材。
- 請求項1〜5のいずれかに記載のSiキルド鋼線材から得られたものであるばね。
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JP2006356308A JP4177403B2 (ja) | 2006-12-28 | 2006-12-28 | 疲労特性に優れたSiキルド鋼線材およびばね |
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JP2006356308A JP4177403B2 (ja) | 2006-12-28 | 2006-12-28 | 疲労特性に優れたSiキルド鋼線材およびばね |
PCT/JP2007/073338 WO2008081674A1 (ja) | 2006-12-28 | 2007-12-03 | Siキルド鋼線材およびばね |
BR122015020249A BR122015020249B1 (pt) | 2006-12-28 | 2007-12-03 | haste e mola de fio de aço acalmado com si |
KR1020117015457A KR101146842B1 (ko) | 2006-12-28 | 2007-12-03 | Si 킬드강 선재 및 스프링 |
CN2010105262801A CN102031450A (zh) | 2006-12-28 | 2007-12-03 | 硅镇静钢线材和弹簧 |
KR1020097013336A KR101168480B1 (ko) | 2006-12-28 | 2007-12-03 | Si 킬드강 선재 및 스프링 |
CN2007800453832A CN101553588B (zh) | 2006-12-28 | 2007-12-03 | 硅镇静钢线材和弹簧 |
EP12004453.2A EP2527485B1 (en) | 2006-12-28 | 2007-12-03 | A silicon killed steel wire rod |
US12/519,179 US9290822B2 (en) | 2006-12-28 | 2007-12-03 | Si-killed steel wire rod and spring |
BRPI0721174A BRPI0721174B1 (pt) | 2006-12-28 | 2007-12-03 | haste e mola de fio de aço acalamdo com si |
EP07832958.8A EP2143812B1 (en) | 2006-12-28 | 2007-12-03 | Silicon-killed steel wire material and spring |
US14/967,520 US9725779B2 (en) | 2006-12-28 | 2015-12-14 | Si-killed steel wire rod and spring |
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Cited By (2)
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WO2012018144A1 (ja) | 2010-08-04 | 2012-02-09 | 日本発條株式会社 | ばねおよびその製造方法 |
WO2012121115A1 (ja) | 2011-03-04 | 2012-09-13 | 日本発條株式会社 | ばねおよびその製造方法 |
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JP5937973B2 (ja) * | 2013-01-15 | 2016-06-22 | 株式会社神戸製鋼所 | 疲労特性に優れたSiキルド鋼線材、およびそれを用いたばね |
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TW408184B (en) * | 1997-09-29 | 2000-10-11 | Kawasaki Steel Co | Manufacturing method for producing Titanium killed steel with smooth surface texture |
US7608130B2 (en) * | 2004-01-22 | 2009-10-27 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for producing high cleanliness steel excellent in fatigue strength or cold workability |
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WO2012018144A1 (ja) | 2010-08-04 | 2012-02-09 | 日本発條株式会社 | ばねおよびその製造方法 |
WO2012121115A1 (ja) | 2011-03-04 | 2012-09-13 | 日本発條株式会社 | ばねおよびその製造方法 |
US9341223B2 (en) | 2011-03-04 | 2016-05-17 | Nhk Spring Co., Ltd. | Spring and manufacture method thereof |
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CN101553588B (zh) | 2011-05-11 |
CN101553588A (zh) | 2009-10-07 |
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