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RU2016149784A - Дважды отожженный стальной лист с высокими механической прочностью и пластичностью, способ изготовления и использование таких листов - Google Patents

Дважды отожженный стальной лист с высокими механической прочностью и пластичностью, способ изготовления и использование таких листов Download PDF

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RU2016149784A
RU2016149784A RU2016149784A RU2016149784A RU2016149784A RU 2016149784 A RU2016149784 A RU 2016149784A RU 2016149784 A RU2016149784 A RU 2016149784A RU 2016149784 A RU2016149784 A RU 2016149784A RU 2016149784 A RU2016149784 A RU 2016149784A
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temperature
rolled
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RU2667947C2 (ru
RU2016149784A3 (ru
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Артем Арлазаров
Жан-Кристоф ХЕЛЛ
Фредерик КЕГЕЛЬ
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Арселормиттал
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Claims (50)

1. Стальной лист, состав которого в % по весу включает в себя:
0,20% ≤ С ≤ 0,40%,
0,8% ≤ Mn ≤1,4%,
1,60% ≤ Si ≤ 3,00%,
0,015 ≤ Nb ≤ 0,150%,
Al ≤ 0,1%,
Cr ≤ 1,0%,
S ≤ 0,006%,
P ≤ 0,030%,
Ti ≤ 0,05%,
V ≤ 0,05%,
Mo ≤ 0,03%,
B ≤ 0,003%,
N ≤ 0,01%,
остальную часть состава составляет железо и неизбежные примеси, возникающие при получении стали, при этом микроструктура в процентах площади состоит из от 10 до 30% остаточного аустенита, от 30 до 60% отожженного мартенсита, от 5 до 30% бейнита, от 10 до 30% свежего мартенсита и менее 10% феррита.
2. Стальной лист по п. 1, в котором в % по весу содержится
0,22% ≤ С ≤ 0,32%.
3. Стальной лист по п. 1 или 2, в котором в % по весу содержится
1,0% ≤ Mn ≤ 1,4%.
4. Стальной лист по любому из пп. 1-3, в котором в % по весу содержится
1,8% ≤ Si ≤ 2,5%.
5. Стальной лист по любому из пп. 1-4, в котором в % по весу содержится
Cr ≤ 0,5%.
6. Стальной лист по любому из пп. 1-5, в котором в % по весу содержится
0,02% ≤ Nb ≤ 0,13%.
7. Стальной лист по любому из пп. 1-6, содержащий покрытие из цинка или цинкового сплава.
8. Стальной лист по любому из пп. 1-6, содержащий покрытие из алюминия или алюминиевого сплава.
9. Стальной лист по любому из пп. 1-8, механическая прочность которого превышает или равна 980 МПа, предел упругости превышает или равен 650 МПа, равномерное удлинение превышает или равно 15%, а удлинение при разрыве превышает или равно 20%.
10. Способ изготовления дважды отожженного холоднокатаного стального листа, включающий в себя следующие последовательные этапы:
получают сталь с составом по любому из пп. 1-6, затем
указанную сталь отливают в виде полуфабриката, затем
указанный полуфабрикат нагревают до температуры Trech, составляющей от 1100°С до 1280°С, для получения нагретого полуфабриката, затем
указанный нагретый полуфабрикат подвергают горячей прокатке, при этом температура конца горячей прокатки Tfl превышает или равна 900°С, для получения горячекатаного листа, затем
указанный горячекатаный лист сматывают в рулон при температуре Tbob, составляющей от 400 до 600°С, для получения смотанного горячекатаного листа, затем
указанный смотанный горячекатаный лист охлаждают до окружающей температуры, затем
указанный смотанный горячекатаный лист разматывают и очищают его поверхность, затем
указанный горячекатаный лист подвергают холодной прокатке с коэффициентом обжатия от 30 до 80% для получения холоднокатаного листа, затем
производят первый отжиг указанного холоднокатаного листа, нагревая его со скоростью VC1 от 2 до 50°С/с до температуры Tsoaking1, составляющей от TS1 = 910,7 - 431,4⋅C - 45,6⋅Mn + 54,4⋅Si - 13,5⋅Cr + 52,2⋅Nb, где значения состава выражены в % по весу, до 950°С в течение времени tsoaking1 от 30 до 200 секунд, затем
указанный лист охлаждают до окружающей температуры со скоростью, превышающей или равной 30°С/с, затем
производят второй отжиг указанного листа, нагревая его со скоростью VC2 от 2 до 50°С/с до температуры Tsoaking2, составляющей от Ас1 до TS2 = 906,5 - 440,6⋅C - 44,5⋅Mn + 49,2⋅Si - 12,4⋅Cr + 55,9⋅Nb, в течение времени tsoaking2 от 30 до 200 секунд, затем
- указанный лист охлаждают со скоростью, превышающей или равной 30°С/с, до температуры конца охлаждения TOA, составляющей от 420°С до 480°С, затем
указанный лист выдерживают в температурном диапазоне от 420 до 480°С в течение времени tOA от 5 до 120 секунд, затем
опционально на указанный лист наносят покрытие и производят отжиг,
указанный лист охлаждают до окружающей температуры.
11. Способ по п. 10, в котором осуществляют отжиг в камерной печи указанного смотанного в рулон горячекатаного листа перед холодной прокаткой таким образом, чтобы указанный лист нагреть и выдержать при температуре, составляющей от 400°С до 700°С в течение времени от 5 до 24 часов.
12. Способ по п. 10 или 11, в котором указанный лист выдерживают при температуре конца охлаждения ТОА в условиях изотермии от 420 до 480°С от 5 до 120 секунд.
13. Способ по любому из пп. 10-12, в котором дважды отожженный холоднокатаный лист подвергают затем холодной прокатке с коэффициентом обжатия от 0,1 до 3% перед нанесением покрытия.
14. Способ по любому из пп. 10-13, в котором последним этапом лист нагревают до температуры выдержки Tbase, составляющей от 150°С до 190°С, в течение времени выдержки tbase от 10 часов до 48 часов.
15. Способ по любому из пп. 10-12, в котором после выдержки при ТОА на лист наносят покрытие путем погружения в жидкую ванну с одним из следующих элементов: алюминий, цинк, алюминиевый сплав или цинковый сплав.
16. Применение листа по любому из пп. 1-9 или листа, полученного способом по любому из пп. 10-15, для изготовления деталей для транспортных средств.
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