JP2022513973A - 熱間圧延鋼及びその製造方法 - Google Patents
熱間圧延鋼及びその製造方法 Download PDFInfo
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Abstract
Description
- 1100MPa以上、好ましくは1200MPaを超える引張強さ、
- 18%以上、好ましくは19%を超える全伸び、
- NACE TM0177規格の降伏強度荷重の少なくとも85%に従う酸性腐食性及び亀裂のない鋼。
表2は、表1の鋼に実施された処理パラメータをまとめたものである。
Ms=764.2-302.6C-30.6Mn-16.6Ni-8.9Cr+2.4Mo-11.3Cu+8.58Co+7.4W-14.5Si
式中、元素の含有率は重量パーセントで表す。
Ae3=955-350C-25Mn+51Si+106Nb+100Ti+68Al-11Cr-33Ni-16Cu+67Mo
式中、元素の含有率は重量パーセントで表す。
表3は、本発明の鋼及び参考の鋼の両方の微細組織を決定するための走査型電子顕微鏡のような異なる顕微鏡に関する標準に従って行われた試験の結果を例示する。
Claims (28)
- 熱間圧延鋼であって、重量パーセントで表される、以下の元素:
15%≦ニッケル≦25%
6%≦コバルト≦12%
2%≦モリブデン≦6%
0.1%≦チタン≦1%
0.0001%≦炭素≦0.03%
0.002%≦リン≦0.02%
0%≦硫黄≦0.005%
0%≦窒素≦0.01%
を含み、以下の任意元素
0%≦アルミニウム≦0.1%
0%≦ニオブ≦0.1%
0%≦バナジウム≦0.3%
0%≦銅≦0.5%
0%≦クロム≦0.5%
0%≦ホウ素≦0.001%
0%≦マグネシウム≦0.0010%
の1種以上を含むことができる組成を有し、残余の組成は鉄及び加工により生じた不可避の不純物から構成され、前記鋼板の微細組織は、面積分率で20%~40%の焼戻しマルテンサイト、少なくとも60%の逆変態オーステナイト、並びにモリブデン、チタン及びニッケルの金属間化合物を含む、熱間圧延鋼。 - 前記組成が16%~24%のニッケルを含む、請求項1に記載の熱間圧延鋼。
- 前記組成が16%~22%のニッケルを含む、請求項1又は2に記載の熱間圧延鋼。
- 前記組成が6%~11%のコバルトを含む、請求項1~3のいずれか一項に記載の熱間圧延鋼。
- 前記組成が7%~10のコバルトを含む、請求項1~4のいずれか一項に記載の熱間圧延鋼。
- 前記組成が3%~6%のモリブデンを含む、請求項1~5のいずれか一項に記載の熱間圧延鋼。
- 前記組成が3.5%~5.5%のモリブデンを含む、請求項1~6のいずれか一項に記載の熱間圧延鋼。
- 前記組成が0.1%~0.9%のチタンを含む、請求項1~7のいずれか一項に記載の熱間圧延鋼。
- 前記組成が0.2~0.8%のチタンを含む、請求項1~8のいずれか一項に記載の熱間圧延鋼。
- モリブデン、チタン及びニッケルの前記金属間化合物が、Ni3Ti、Ni3Mo又はNi3(Ti、Mo)の少なくとも1種以上である、請求項1~9のいずれか一項に記載の熱間圧延鋼。
- モリブデン、チタン及びニッケルの前記金属間化合物が、粒間金属間化合物及び粒内金属間化合物を含む、請求項1~10のいずれか一項に記載の熱間圧延鋼。
- 前記鋼が、1100MPa以上の引張強さ及び18%以上の全伸びを有する、請求項1~11のいずれか一項に記載の熱間圧延鋼。
- 前記鋼が、1200MPa以上の引張強さ及び19%以上の全伸びを有する、請求項1~12のいずれか一項に記載の熱間圧延鋼。
- 次の連続した工程を含む熱間圧延鋼の製造方法:
- 請求項1~9のいずれか一項に記載の鋼組成を提供する工程、
- 前記半完成品を1150℃~1300℃の間の温度に再加熱する工程、
- 熱間圧延仕上げ温度が800~975℃の間となるように前記半完成品をオーステナイテトの範囲で圧延して、熱間圧延鋼ストリップを得る工程、
- 次いで、前記熱間圧延鋼ストリップを10℃~Msの間の温度範囲に冷却する工程、
- その後、前記熱間圧延鋼ストリップをAe3~Ae3+350℃の間の焼鈍温度まで再加熱し、そのような温度で30分よりも長い間保持し、及び1℃/秒~100℃/秒の間の速度で10℃~Msの間の温度範囲まで冷却する工程、
- その後、前記熱間圧延鋼ストリップを0.1℃/秒~100℃/秒の間の加熱速度で575℃~700℃の間の焼戻し温度範囲まで再加熱し、及び前記熱間圧延鋼ストリップを前記焼戻し温度範囲に30分~72時間の間の持続時間保持する工程、
- 次いで、前記熱間圧延鋼ストリップを室温まで冷却し、熱間圧延鋼を得る工程。 - 半完成品の前記再加熱温度が1150℃~1275℃の間である、請求項14に記載の方法。
- 前記熱間圧延仕上げ温度が800℃~950℃の間である、請求項14又は15に記載の方法。
- 熱間圧延終了後の熱間圧延ストリップの前記冷却温度範囲が、15℃~Ms-20℃の間である、請求項14~16のいずれか一項に記載の方法。
- 前記焼鈍温度範囲がAe3+20℃~Ae3+350℃の間である、請求項14~17のいずれか一項に記載の方法。
- 前記焼鈍温度範囲がAe3+40℃~Ae3+300℃の間である、請求項18に記載の方法。
- 焼鈍後の前記冷却速度が1℃/秒~80℃/秒の間である、請求項14~19のいずれか一項に記載の方法。
- 焼鈍後の前記冷却速度が1℃/秒~50℃/秒の間である、請求項20に記載の方法。
- 焼鈍後の前記冷却温度範囲が15℃~Ms-20℃の間である、請求項14~21のいずれか一項に記載の方法。
- 前記焼戻し温度範囲が575℃~675℃の間である、請求項14~22のいずれか一項に記載の方法。
- 前記焼戻し温度範囲が590℃~660℃の間である、請求項23に記載の方法。
- 焼戻しのための前記加熱速度が0.1℃/秒~50℃/秒の間である、請求項14~24のいずれか一項に記載の方法。
- 焼戻しのための前記加熱速度が0.1℃/秒~30℃/秒の間である、請求項25に記載の方法。
- 石油及びガス井戸の構造部品又は操作部品の製造のための、請求項1~14のいずれか一項に記載の鋼又は請求項14~26のいずれか一項に記載の方法で製造された鋼の使用。
- 請求項27に従って得られたシームレスチューブ、パイプ又は部品。
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CN113549842A (zh) * | 2021-06-21 | 2021-10-26 | 首钢集团有限公司 | 一种高强度防弹头盔壳及其制备方法 |
CN113751679B (zh) * | 2021-09-09 | 2022-10-28 | 中南大学 | 一种无钴马氏体时效钢冷轧薄带的制造方法 |
CN114369769B (zh) * | 2021-11-30 | 2022-10-11 | 中国科学院金属研究所 | 一种超高强高韧贝氏体时效钢及其热处理工艺 |
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KR102634503B1 (ko) | 2024-02-07 |
CA3121604A1 (en) | 2020-06-25 |
ZA202103681B (en) | 2022-04-28 |
CN113166827A (zh) | 2021-07-23 |
WO2020128568A1 (en) | 2020-06-25 |
EP3899062A1 (en) | 2021-10-27 |
CA3121604C (en) | 2023-08-15 |
MX2021007122A (es) | 2021-08-11 |
KR20210091774A (ko) | 2021-07-22 |
WO2020128725A1 (en) | 2020-06-25 |
BR112021010529B1 (pt) | 2024-01-23 |
BR112021010529A2 (pt) | 2021-08-24 |
MA54506A (fr) | 2022-03-23 |
UA127398C2 (uk) | 2023-08-09 |
US20220074029A1 (en) | 2022-03-10 |
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