JP2022024978A - 浸炭軸受鋼及びその製造方法 - Google Patents
浸炭軸受鋼及びその製造方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 95
- 239000010959 steel Substances 0.000 title claims abstract description 95
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 20
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000005255 carburizing Methods 0.000 claims abstract description 13
- 238000000265 homogenisation Methods 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000003723 Smelting Methods 0.000 claims description 25
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 238000005242 forging Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000000137 annealing Methods 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 8
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 150000001247 metal acetylides Chemical class 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 238000007670 refining Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 241001417490 Sillaginidae Species 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
Description
浸炭軸受鋼を製造するための原材料を製錬することで、化学組成が上記手段に記載の浸炭軸受鋼の化学組成に対応する鋼インゴットを得るステップと、
前記鋼インゴットを均質化した後、棒材に加工されるステップと、
前記棒材に対して順次浸炭処理、焼入れ、焼戻しを行い、浸炭軸受鋼を得るステップと、を含む、
上記の手段に記載の浸炭軸受鋼の製造方法を提供する。
浸炭軸受鋼を製造するための原材料を製錬することで、化学組成が上記手段に記載の浸炭軸受鋼の化学組成に対応する鋼インゴットを得るステップと、
前記鋼インゴットを均質化した後、棒材に加工されるステップと、
前記棒材に対して順次浸炭処理、焼入れ、焼戻しを行い、浸炭軸受鋼を得るステップと、を含む、
上記の手段に記載の浸炭軸受鋼の製造方法を提供する。
本発明の鋼は、実験用真空誘導炉で製錬され、キャストインゴットタイプは50kgの丸型インゴットであり、棒状サンプルを鍛造するために合計5個炉の鋼が製錬され、化学組成を表1に示す。NA1~NA4鋼は、本発明の浸炭軸受鋼及びCV1と比較用軸受鋼であった。実験用真空誘導製錬による鋼インゴットは、1200℃、6時間の高温均質化処理を経った後、鍛造・鍛伸加工され、鍛造初期温度は1150℃、最終鍛造温度は900℃、初期断面サイズは120mmである鋳造ビレットを断面サイズ60mmの丸棒に放射状に鍛造し、鍛造した後に室温まで水冷した。直径60mmの丸棒を930℃で12時間浸炭し、室温まで油冷却し、その後、820℃で0.5時間保温し、焼入れ、室温まで油焼入れ、最後に、170℃で2時間保温して焼きなまし、室温まで空冷して浸炭軸受鋼を得た。接触疲労試験(最大ヘルツ応力4.5GPaのスラストピース試験)を実施し、その結果を表2と図1に示す。
Claims (9)
- 浸炭軸受鋼であって、0.18~0.24wt%C、0.4~0.6wt%Cr、0.20~0.40wt%Si、0.40~0.70wt%Mn、1.6~2.2wt%Ni、0.15~0.35wt%Mo、0.001~0.01wt%S、0.001~0.015wt%P、0~0.20wt%Nb、0~0.20wt%V及び残りの鉄という含有量の元素を含み、前記NbとVの含有量は、同時に0ではないことを特徴とする浸炭軸受鋼。
- 前記NbとVの総量は、0.3wt%より小さいことを特徴とする請求項1に記載の浸炭軸受鋼。
- 請求項1又は2に記載の浸炭軸受鋼の製造方法であって、
浸炭軸受鋼を製造するための原材料を製錬することで、化学組成が請求項1又は2に記載の浸炭軸受鋼の化学組成に対応する鋼インゴットを得るステップと、
前記鋼インゴットを均質化した後、棒材に加工されるステップと、
前記棒材に対して順次浸炭処理、焼入れ、焼戻しを行い、浸炭軸受鋼を得るステップと、を含む浸炭軸受鋼の製造方法。 - 前記製錬の方法は、エレクトロスラグ製錬、二重真空製錬、炉外精製または真空誘導炉製錬であることを特徴とする請求項3に記載の製造方法。
- 前記均質化処理の温度は1100~1250℃、保温時間は2~6時間であることを特徴とする請求項3に記載の製造方法。
- 前記浸炭処理の温度は930℃±10℃、保温時間は6~12時間であることを特徴とする請求項3に記載の製造方法。
- 前記焼入れの温度は、820℃±10℃、保温時間は、0.5~2時間であり、前記焼入れの冷却方法は室温まで油焼入れることであることを特徴とする請求項3に記載の製造方法。
- 前記焼きなましの温度は、170℃±10℃、保温時間は、1~2時間であり、前記焼きなましの冷却方法は室温まで空冷することであることを特徴とする請求項3に記載の製造方法。
- 前記棒材の加工方法は熱間鍛造または熱間圧延であり、前記熱間鍛造または熱間圧延の温度は1150~1200℃であり、最終鍛造または最終圧延の温度は900℃以上であることを特徴とする請求項3に記載の製造方法。
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