JP7221882B2 - コーティングを備えた鋼部品の製造方法および鋼部品 - Google Patents
コーティングを備えた鋼部品の製造方法および鋼部品 Download PDFInfo
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Description
0.0034℃/分≦Q≦0.021℃/分 (1)
Q=(T*d)/(t*L)において、式中、
T=炉内温度(℃)、
d=ブランク厚さ(mm)、
t=炉内のブランクの保持時間(分)、
L=炉長(m)
-第1ケイ素リッチ層Si1は、不可避の不純物の他に、4超~8重量%以下のSi、40~70重量%のFe、1重量%以下のMnおよび30~60重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、第1低ケイ素層Aの上に位置する。
-第1低ケイ素層Aは、不可避の不純物の他に、1~4重量%のSi、30~60重量%のFe、1重量%以下のMnおよび40~60重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、第1ケイ素リッチ層Si1と第2ケイ素リッチ層Si2との間に位置する。
-第2ケイ素リッチ層Si2は、不可避の不純物の他に、4重量%超~8重量%以下のSi、40~70重量%のFe、1重量%以下のMnおよび20~50重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、第1低ケイ素層Aと第2低ケイ素層Bとの間に位置する。
-第2低ケイ素層Bは、不可避の不純物の他に、0.5~4重量%のSi、40~97重量%のFe、0.5~1.5重量%のMnおよび2~40重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、鋼基材に接している。
0.4≦X≦1.1 (2)
X=dB/dAにおいて、式中、
dB=低Si層Bの厚さ(μm)
dA=低Si層Aの厚さ(μm)。
Claims (13)
- 防食コーティングで被覆された鋼部品の製造方法であって、前記方法は、
a)アルミニウム系防食コーティングで被覆された平鋼製品を供給する作業工程と、
b)前記コーティングで被覆された平鋼製品から得られたブランクを連続炉内で熱処理する作業工程であって、
0.0034℃/分≦Q≦0.021℃/分
Q=(T*d)/(t*L)において、式中、
T=炉内温度(℃)、
d=ブランク厚さ(mm)、
t=炉内のブランクの保持時間(分)、
L=炉長(mm)
である、作業工程と、
c)前記ブランクを成形ツールで鋼部品の形に成形する作業工程と
を含み、
前記炉内温度Tが少なくとも830℃、最大で980℃であり、前記アルミニウム系防食コーティングが3~15重量%のケイ素と、3.5重量%以下の鉄とを含有し、残部はアルミニウムおよび不可避の不純物であることを特徴とする、方法。 - 作業工程b)中に少なくとも1.5m/分、最大で25m/分の平均速度(vP)で前記ブランクが前記炉内を移動することを特徴とする、請求項1に記載の方法。
- 前記炉内の前記ブランクの保持時間tが少なくとも1分、最大で18分であることを特徴とする、請求項1または2に記載の方法。
- 前記アルミニウム系防食コーティングのSi含有率が7~12重量%であることを特徴とする、請求項1から3のいずれか一項に記載の方法。
- 前記アルミニウム系防食コーティングのSi含有率が9~10重量%であることを特徴とする、請求項1から4のいずれか一項に記載の方法。
- 前記アルミニウム系防食コーティングのFe含有率が1~3.5重量%であることを特徴とする、請求項1から5のいずれか一項に記載の方法。
- 前記アルミニウム系防食コーティングのFe含有率が2~3.5重量%であることを特徴とする、請求項1から6のいずれか一項に記載の方法。
- 作業工程c)において前記成形ツール内で少なくとも20K/秒、最大で1000K/秒の冷却速度(CR)で前記ブランクが冷却されることを特徴とする、請求項1から7のいずれか一項に記載の方法。
- 鋼基材と、前記鋼基材の少なくとも片面上の防食コーティングとを含む鋼部品において、前記防食コーティングが少なくとも、
-不可避の不純物の他に、4超~8重量%以下のSi、40~70重量%のFe、1重量%以下のMnおよび30~60重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、第1低ケイ素層(A)の上に位置する、第1ケイ素リッチ層(Si1)と、
-不可避の不純物の他に、1~4重量%のSi、30~60重量%のFe、1重量%以下のMnおよび40~60重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、第1ケイ素リッチ層(Si1)と第2ケイ素リッチ層(Si2)との間に位置する、第1低ケイ素層(A)と、
-不可避の不純物の他に、4超~8重量%以下のSi、40~70重量%のFe、1重量%以下のMnおよび20~50重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、前記第1低ケイ素層(A)と前記第2低ケイ素層(B)との間に位置する、第2ケイ素リッチ層(Si2)と、
-不可避の不純物の他に、0.5~4重量%のSi、40~97重量%のFe、0.5~1.5重量%のMnおよび2~40重量%のアルミニウムを含有し、存在する成分の合計は100重量%であり、前記鋼基材に接している、第2低ケイ素層(B)と
を含み、
前記第1低ケイ素層(A)の厚さ(dA)(μm)に対する前記第2低ケイ素層(B)の厚さ(dB)(μm)から得られた商Xは、少なくとも0.4、最大で1.1であることを特徴とする、鋼部品。 - 前記鋼基材が、0.10~0.25重量%のC、1.0~1.4重量%のMn、0.35~0.4重量%のSi、0.03重量%以下のP、0.01重量%以下のS、0.040重量%以下のAl、0.15重量%以下のTi、0.1重量%以下のNb、0.005重量%以下のB、0.5重量%以下のCr、0.5重量%以下のMoであり、CrおよびMoの合計量は最大で0.5重量%であり、残部は鉄および不可避の不純物である鋼材からなることを特徴とする、請求項9に記載の鋼部品。
- Xが少なくとも0.45、最大で0.9であることを特徴とする、請求項9または10に記載の鋼部品。
- 前記第1ケイ素リッチ層(Si1)および/または前記第2ケイ素リッチ層(Si2)のSi含有率が5~8重量%であることを特徴とする、請求項9から11のいずれか一項に記載の鋼部品。
- 前記第1ケイ素リッチ層(Si1)のFe含有率および前記第2ケイ素リッチ層(Si2)のFe含有率がいずれの場合にも前記第1低ケイ素層(A)のFe含有率よりも高いことを特徴とする、請求項9から12のいずれか一項に記載の鋼部品。
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