JP2019531896A - 圧延接合金属シートの製造方法 - Google Patents
圧延接合金属シートの製造方法 Download PDFInfo
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Abstract
Description
58%≦Ni≦73%、20%≦Cr≦25%、0%≦Fe≦5%、0%≦C≦0.03%又は0.1%、0%≦Mn≦0.5%、0%≦Si≦0.5%、0%≦Co≦1%、0%≦Al≦0.4%、0%≦Ti≦0.4%、0%≦P≦0.015%、0%≦S≦0.015%、8%≦Mo≦10%、1.5%≦Nb+Ta≦x(xは3.1%、2.8%、2.5%又は2.2%)、残部は不純物。
1.5%≦Nb+Ta≦3.1%
1.5%≦Nb+Ta≦2.8%
1.5%≦Nb+Ta≦2.5%
1.5%≦Nb+Ta≦2.2%
1.7%≦Nb+Ta≦2.3%
59%≦Ni≦69%
60%≦Ni≦69%
21%≦Cr≦23%
0%≦C≦0.03%
0%≦Mn≦0.3%
0%≦Si≦0.4%
0%≦Co≦0.7%
0%≦Al≦0.3%
0%≦Ti≦0.3%
0%≦Ta≦0.5%
0%≦Ta≦0.2%
Cu≦0.3%
W≦0.50%
W≦0.20%
Pb≦0.002%
Zn≦0.002%
Sn≦0.002%
これら含有量が高いと加工性が低下する。
0%≦C≦0.16%、0%≦Si≦0.50%、1.10%≦Mn≦1.65%、0%≦P≦0.022%、0%≦S≦0.010%、0%≦Nb≦0.05%、0%≦Ti≦0.06%、0%≦V≦0.10%、残部は鉄及び不純物。
0%≦C≦0.16%、0%≦Si≦0.50%、1.10%≦Mn≦1.60%、0%≦P≦0.022%、0%≦S≦0.005%、0%≦Cr≦0.50%、0%≦Mo≦0.20%、0%≦Ni≦0.20%、0.020%≦Al≦0.060%、0%≦Cu≦0.20%、0%≦N≦0.014%、0%≦Nb≦0.05%、0%≦Ti≦0.02%、0%≦V≦0.010%、0%≦As≦0.02%、0%≦Sb≦0.01%、0%≦Sn≦0.015%、0%≦Pb≦0.010%、0%≦Bi≦0.010%、0%≦Ca≦0.005%、0%≦B≦0.0005%、0%≦Cr+Mo+Ni+Cu≦0.5%、0%≦Nb+V≦0.10%及び0%≦Nb+V+Ti≦0.15%、残部は鉄及び不純物であり、更に、CEV≦0.43%及びPcm≦0.25%を満たす。(ここで、CEV=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15であり、Pcm=C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5Bである)。
PREN=Cr+3.3×(Mo+W)+16×N
ここで、Cr、Mo、W及びNはそれぞれの元素の含有量(質量%)である。Cr、Mo、W、Nの各含有量が高いと耐孔食性が高い。PRENは、更に影響するパラメータを含まない、経験的な式である。
Claims (16)
- 圧延接合クラッド金属シートの製造方法であって、
金属基材からなる層と金属クラッド材からなる層とを合一して積層体を製造する工程と、
前記積層体を加熱する工程と、
加熱した前記積層体を熱機械的に圧延する工程であって、前記金属基材層と前記金属クラッド材層との間に冶金的接合を形成するために、加熱した前記積層体の予備圧延を行う第一圧延フェーズと、前記積層体の最終成形のための第二圧延フェーズと、前記第一圧延フェーズ及び前記第二圧延フェーズの間の冷却期間とを含む工程と
を包含し、
前記クラッド材はニッケル基材料であって、その化学組成は、質量%で、50%を超えるNiと、3.1%以下のNbとを含み、Nbは好ましくは2.8%以下であり、特にNb+Taは2.8%以上であり、
前記第二圧延フェーズで実施する最終圧延の温度は、880℃以下、特に850℃以下に設定する、製造方法。 - 前記クラッド材の化学組成は、質量%で、2.5%以上のNbを含み、特にNb+Taは2.5%以上である、請求項1に記載の方法。
- 前記クラッド材はニッケル基合金、特にニッケル−クロム−モリブデン−ニオブ合金である、請求項1又は2に記載の方法。
- 前記クラッド材の化学組成は、質量%で、58%≦Ni≦73%、20%≦Cr≦25%、0%≦Fe≦5%、0%≦C≦0.1%、0%≦Mn≦0.5%、0%≦Si≦0.5%、0%≦Co≦1%、0%≦Al≦0.4%、0%≦Ti≦0.4%、0%≦P≦0.015%、0%≦S≦0.015%、8%≦Mo≦10%、1.5%≦Nb+Ta≦2.8%、残部は不純物である、請求項1〜3のいずれか一項に記載の方法。
- 前記クラッド材は、質量%で、下記元素の少なくとも1種を任意でさらに含む、請求項4に記載の方法。
0%≦Ta≦1%、0%≦B≦0.008%、Cu≦0.5%、W≦1%、V≦0.5%、N≦0.05%、Mg≦0.05%、Ca≦0.05%、Pb≦0.002%、Zn≦0.002%、Sn≦0.002%。 - 前記金属基材は炭素鋼である、請求項1〜5のいずれか一項に記載の方法。
- 前記炭素鋼の化学組成は、質量%で、下記範囲の少なくとも1種を満たす、請求項6に記載の方法。
0%≦C≦0.30%又は0.16%、0%≦Si≦0.50%、1.10%≦Mn≦1.65%又は1.40%、0%≦P≦0.022%、0%≦S≦0.010%、0%≦Nb≦0.05%、0%≦Ti≦0.06%、0%≦V≦0.10%(質量%)、残部は鉄及び不純物である。 - 前記第一圧延フェーズは、1000℃〜1200℃の初期圧延温度で実施する、請求項1〜7のいずれか一項に記載の方法。
- 前記最終圧延の温度は、前記金属基材からなる層の再結晶停止温度より低い、特に少なくとも10℃低い、請求項1〜8のいずれか一項に記載の方法。
- 圧延フェーズ間の前記冷却期間は、大気中で3〜15分である、請求項1〜9のいずれか一項に記載の方法。
- 冶金的接合により互いに接合された金属基材層と金属クラッド材層とを含む、圧延接合クラッド金属シートであって、
前記金属クラッド材はニッケル基材料であり、その化学組成は、質量%で、50%を超えるNiと、3.1%以下のNbとを含み、Nbは好ましくは2.8%以下であり、特にNb+Taは2.8%以上であり、
前記圧延接合クラッド金属シートは熱機械的圧延によって得られうるものであり、前記熱機械的圧延は、予備圧延のための第一圧延フェーズと、最終成形のための第二圧延フェーズと、前記第一圧延フェーズ及び前記第二圧延フェーズの間の冷却期間とを含み、前記第二圧延フェーズの最終圧延の温度は、880℃以下、特に850℃以下に設定する、
圧延接合クラッド金属シート。 - 前記第一圧延フェーズと前記第二圧延フェーズの間の前記冷却期間は、前記金属シートの加速冷却及び/又は加熱を含む、請求項11に記載の圧延接合クラッド金属シート。
- 前記金属基材層の厚さは25mm以上、特に30mm以上又は35mm以上である、請求項11又は12に記載の圧延接合クラッド金属シート。
- 前記金属基材層の化学組成は、API 5L規格、特にAPI 5L グレードX65、DNV OS−F101、ISO 3183又は他の同様の規格の1以上に従う、請求項11〜13のいずれか一項に記載の圧延接合クラッド金属シート。
- 前記金属基材層は、ノッチ付き衝撃試験で測定したの靭性が、−70℃、特に−80℃において50J以上、及び/又はバテル落錘式衝撃試験後のマット破壊比が、−20℃、特に−30℃において80%以上である、請求項11〜14のいずれか一項に記載の圧延接合クラッド金属シート。
- 前記金属クラッド材層の厚さは2mm以上、特に2.5mm以上である、請求項11〜15のいずれか一項に記載の圧延接合クラッド金属シート。
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