JP7459251B2 - 多層圧延複合板及びその製造方法 - Google Patents
多層圧延複合板及びその製造方法 Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims description 109
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 65
- 239000010959 steel Substances 0.000 claims description 65
- 230000007704 transition Effects 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 19
- 238000005096 rolling process Methods 0.000 claims description 17
- 229910052729 chemical element Inorganic materials 0.000 claims description 16
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- 239000000463 material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000002184 metal Substances 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 229910000734 martensite Inorganic materials 0.000 claims description 5
- 238000000137 annealing Methods 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- 239000010960 cold rolled steel Substances 0.000 claims description 3
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 80
- 230000000052 comparative effect Effects 0.000 description 17
- 238000009792 diffusion process Methods 0.000 description 10
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- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
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- 230000009471 action Effects 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
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Description
本発明の技術的解決策において、異方性の薄い鋼板の配向度が高い場合、結晶粒内の欠陥密度が増加し、オーステナイト再結晶および結晶粒成長速度が増加し、鋼板に垂直な方向の再結晶駆動力は、鋼板に平行な方向の鋼板の駆動力よりも大きいので、熱間圧延鋼板の加熱・均熱過程では、鋼板の配向度が高いことは、遷移層としての異方性薄鋼板が、ビレットの組み立て中に母材の表面の酸化膜を溶解し、複合板の他の層と急速に冶金学的に結合することに寄与する。配向度が大きすぎることを考慮すると、複合層内の異方性の薄い鋼板の成分の拡散率が高くなり、層間の成分の拡散を制御することは困難であり、これに基づいて、組立て前の異方性の薄い鋼板の配向度は、1.25≧AI≧1.05を満たすように制御される。
また、本発明の多層圧延複合板では、異方性の薄い鋼板の各層の厚さは、多層圧延複合板の全厚の5%未満、好ましくは全厚の1%未満である。
また、本発明の多層圧延複合板において、多層圧延複合板の少なくとも1つの表面は、金属または非金属メッキ層を有する。
(1)隣接する複合層の間に遷移層を設定して、ビレットの組み立を行い、各層間を真空にする;
(2)複合圧延:ビレットを1100-1260℃まで加熱し、0.5時間以上、好ましく0.6時間以上保温し、最終圧延温度を超820℃に制御し、圧延後30~100℃/sの速度で冷却してから巻取りを行い、巻取り温度を20~750℃に制御する。
本発明の多層圧延複合板は、組成やプロセスに応じて大幅に変更でき、100MPaから1700MPaまでのさまざまな強度レベルを達成でき、鋼板全体にさまざまな特定の機械的特性の基礎を提供する。
実施例1~6の多層圧延複合板は、以下のステップによって得られる:
(1)隣接する複合層の間に遷移層を設定して、ビレットの組み立を行い、各層間を真空にして、ただし、各層のビレットの質量パーセントを表1に示す。本願には、複合層は、基材層と複合材料層とを含む。
他の実施形態において、ステップ(4)の焼鈍も含まれる:均熱温度は700~880℃であり、その後、3~20℃/秒の速度で600~780℃、好ましくは600~770℃の急速冷却開始温度に冷却され、その後、20-1000℃/s、好ましくは40-1000℃/sの速度で150-550℃に冷却する。
表1に、実施例1~6の多層圧延複合板と比較実施例1の比較複合板の各化学元素の質量パーセントを示した。
図2は、実施例1の多層圧延複合板の構造を示す。
遷移層3の異方性の薄い鋼板は、冷間圧延鋼板または熱間圧延酸洗鋼板であり、組立て前の異方性の薄い鋼板の配向度は、1.25≧AI≧1.05を満たすように制御され、異方性の薄い鋼板の各層の厚さは、多層圧延複合板の全厚の5%未満である。
図4は、実施例1の多層圧延複合板の微細構造の金属組織図である。
つまり、本発明の多層圧延複合板は、組成やプロセスに応じて大幅に変更でき、100MPaから1700MPaまでのさまざまな強度レベルを達成でき、鋼板全体にさまざまな特定の機械的特性の基礎を提供する。
本発明の保護の範囲における従来技術部分は、本出願書類に記載の実施例に限定されるものではなく、本発明の方案と矛盾しない先行技術(先行の特許文献、先行の公開出版物、先行の公開使用などを含むが、それらに限定されない)は、全て本発明の保護の範囲に取り入れられることを説明すべきである。
Claims (14)
- 2つの隣接する複合層の間に配置された遷移層を含む、上記の遷移層は、異方性の薄い鋼板であることを特徴とする多層圧延複合板であって、
組立て前の異方性の薄い鋼板の配向度は、1.25≧AI≧1.05を満たし、
上記の異方性の薄い鋼板の各層の厚さは、多層圧延複合板の全厚の5%未満で、
上記の異方性の薄い鋼板の化学元素組成質量パーセントは、C:0.01-0.10%;Si:0.01-0.5%;Mn:0.5-2.5%;Al:0.01-0.06%;Ti:≦0.06%;Cr:≦0.50%;Mo:≦0.30%;残部はFeと不可避不純物で、
前記複合層は軟鋼、高強度鋼、マルテンサイト鋼または高析出強化鋼であって、
前記軟鋼の化学元素組成質量パーセントは、C:0.0005-0.003%;Si:0.001-0.01%;Mn:0.1-0.5%;Al:0.01-0.04%;Ti:≦0.06%;残部はFeと不可避不純物である、または、
前記軟鋼の化学元素組成質量パーセントは、C:0.01-0.04%;Si:0.01-0.05%;Mn:0.1-0.5%;Al:0.01-0.04%;残部はFeと不可避不純物であって、
前記高強度鋼の化学元素組成質量パーセントは、C:0.1-0.3%;Si:1.3-2.0%;Mn:1.5-3.0%;Al:0.01-0.05%;Ti:0.01-0.03%;Mo:≦0.3%;残部はFeと不可避不純物である、または、
前記高強度鋼の化学元素組成質量パーセントは、C:0.05-0.15%;Si:0.1-0.4%;Mn:1.5-3.0%;Al:0.01-0.05%;Ti:0.01-0.03%;Cr:0.4-0.6%;Mo:0.1-0.3%;残部はFeと不可避不純物であって、
前記マルテンサイト鋼の化学元素組成質量パーセントは、C:0.2-0.3%;Si:0.1-0.5%;Mn:1.0-1.6%;Al:0.01-0.25%;B:0.001-0.005%;Ti:≦0.05%;Cr:≦0.3%;Mo:≦0.2%;残部はFeと不可避不純物であって、
前記高析出強化鋼の化学元素組成質量パーセントは、C:0.03-0.08%;Si:0.1-0.4%;Mn:1.0-1.5%;Al:0.01-0.05%;Ti:0.05-0.12%;残部はFeと不可避不純物である、
多層圧延複合板。 - 上記の異方性の薄い鋼板は、冷間圧延鋼板または熱間圧延酸洗鋼板であることを特徴とする請求項1に記載された多層圧延複合板。
- 多層圧延複合版が1つまたは複数の遷移層を有することを特徴とする請求項1に記載された多層圧延複合板。
- 上記の多層圧延複合複合板は、基材層、基材層の片側または両側に配置された遷移層、および遷移層の外側に配置された複合材料層を含む;ただし、基板層の厚さは、0.5~4.0mmであり、各の複合材料層の厚さは、0.05~0.4mmの範囲にあることを特徴とする請求項1に記載された多層圧延複合板。
- 上記の多層圧延複合板の少なくとも1つの表面は、金属または非金属メッキ層を有することを特徴とする請求項1に記載された多層圧延複合板。
- 上記の異方性の薄い鋼板の化学元素組成質量パーセントは、C:0.01-0.10%;Si:0.01-0.4%;Mn:1.0-2.3%;Al:0.02-0.04%;Ti:≦0.05%;Cr:≦0.50%;Mo:≦0.30%;残部はFeと不可避不純物であることを特徴とする請求項1に記載された多層圧延複合板。
- 上記の多層圧延複合板は、基材層、遷移層、と複合材料層を含み、ただし、遷移層のC含有量は、基材層と複合材料層との間にあることを特徴とする請求項1に記載された多層圧延複合板。
- 以下のステップを含むことを特徴とする請求項1-7のいずれか一つに記載された多層圧延複合板の製造方法:
(1)隣接する複合層の間に遷移層を設定して、ビレットの組み立を行い、各層間を真空にする;
(2)複合圧延:ビレットを1100-1260℃まで加熱し、0.5時間以上保温し、Ar3以上の温度で熱間圧延し、最終圧延温度を超820℃に制御し、圧延後30~100℃/sの速度で冷却してから巻取りを行い、巻取り温度を20~750℃に制御する。 - さらにステップ(3)の冷間圧延を含むことを特徴とする請求項8に記載された製造方法。
- さらにステップ(4)の焼鈍:均熱温度は700~880℃であり、その後、3~20℃/秒の速度で600~780℃の急速冷却開始温度に冷却され、その後、20-1000℃/sの速度で150-550℃に冷却することを含むことを特徴とする請求項9に記載された製造方法。
- さらにステップ(5)の焼戻し:焼戻し温度は150~550℃であり、焼戻し時間は100~400秒であることを特徴とする請求項10に記載された製造方法。
- さらに平坦化ステップを含むことを特徴とする請求項8~11のいずれか一つに記載された製造方法。
- 上記の異方性の薄い鋼板の各層の厚さは、0.5-10.0mmであることを特徴とする請求項1に記載された多層圧延複合板。
- 上記の異方性の薄い鋼板の各層の厚さは、1-3mmであることを特徴とする請求項13に記載された多層圧延複合板。
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