RU2016109549A - Коррозионностойкая и износостойкая инструментальная сталь для холодной обработки - Google Patents

Коррозионностойкая и износостойкая инструментальная сталь для холодной обработки Download PDF

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RU2016109549A
RU2016109549A RU2016109549A RU2016109549A RU2016109549A RU 2016109549 A RU2016109549 A RU 2016109549A RU 2016109549 A RU2016109549 A RU 2016109549A RU 2016109549 A RU2016109549 A RU 2016109549A RU 2016109549 A RU2016109549 A RU 2016109549A
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steel
powder metallurgy
ecc
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Себастиан ЭЙНЕРМАРК
Томас ХИЛЛЬСКОГ
Ларс Экман
Рикард РОБЕРТССОН
Виктория БЕРГКВИСТ
Йенни КАРЛССОН
Петтер ДАММ
Ульрика МОССФЕЛЬДТ
Роланд ЭДВИНССОН
СВЕНССОН Анника ЭНГСТРЁМ
Берне ХЁГМАН
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Уддехольмс АБ
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Claims (20)

1. Изготовленная с помощью порошковой металлургии сталь, состоящая из, масс. %:
С 0,3-0,8 N 1,0-2,2 (C+N) 1,3-2,2 C/N 0,17-0,50 Si ≤1,0 Mn 0,2-2,0 Cr 13-30 Mo 0,5-3,0 W ≤1 (Mo+W/2) 0,5-3,0 V 2,0-5,0 Nb ≤2,0 (V+Nb/2) 2,0-5,0 (Ti+Zr+Al) ≤7,0 Ta ≤0,5 Со ≤10,0 Ni ≤5,0 Cu ≤3,0 Sn ≤0,3 В ≤0,01 Be ≤0,2 Bi ≤0,3 Se ≤0,3 Te ≤0,3 Mg ≤0,01 P3M ≤0,2 Ca ≤0,05 S ≤0,5 железо и примеси остальное
2. Изготовленная с помощью порошковой металлургии сталь по п. 1, в которой верхний предел содержания V ограничен 4,8%, 4,6%, 4,4%, 4,2% или 4,0%.
3. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь удовлетворяет по меньшей мере одному из следующих требований, в масс. %:
С 0,3-0,6 N 1,1-1,8 (C+N) 1,7-2,1 C/N 0,20-0,46 Cr 15-30 Mo 0,7-2,5 V 2,5-4,5 Nb ≤0,5
4. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь удовлетворяет по меньшей мере одному из следующих требований, в масс. %:
С 0,35-0,45 N 1,3-1,7 (C+N) 1,8-2,0 C/N 0,22-0,45 Cr 16-28 Mo 0,8-2,0 V 2,5-3,8 Со 4,0-6,0 Nb ≤0,1 Cu 0,02-2,0
5. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь удовлетворяет по меньшей мере одному из следующих требований, в масс. %:
Cr 18-26 Mo 0,8-1,5 Se <0,05 Cu 0,05-1,5 Со ≤0,2 за исключением, когда Со добавлен как определено в п. 4 W ≤0,2 Ti ≤0,1 Nb ≤0,05 P3M ≤0,05 В ≤0,004
6. Изготовленная с помощью порошковой металлургии сталь по п. 1, в которой микроструктура содержит отпущенный мартенсит и твердые фазы, состоящие из одной или более фаз, выбранных из MX, М2Х, М23С6 и М7С3, и сталь имеет твердость 58-64 HRC, предпочтительно 60-62 HRC.
7. Изготовленная с помощью порошковой металлургии сталь по п. 6, в которой содержание твердых фаз MX, М2Х, М23С6 и М7С3 удовлетворяет следующим требованиям, в об. %:
MX 5-25, предпочтительно 5-20, более предпочтительно 5-15 М2Х ≤10, предпочтительно ≤5, более предпочтительно ≤1 М23С67С3 ≤10, предпочтительно ≤5, более предпочтительно ≤1,
где М представляет собой один или более элемент из V, Мо и Cr, и X представляет собой один или более элемент из С, N или В.
8. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь при температуре аустенизации, ТА, составляющей 1080°C, имеет вычисленный ЭСТК≥18, где ЭСТК=Cr+3,3Mo+30N, и Cr, Мо и N являются вычисленными равновесными содержаниями элементов, растворенными в матрице при ТА, и содержание растворенного в аустените хрома составляет по меньшей мере 13%.
9. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь при температуре аустенизации, ТА, составляющей 1080°C, имеет вычисленный ЭСТК≥20, где ЭСТК=Cr+3,3Mo+30N, и Cr, Мо и N являются вычисленными равновесными содержаниями элементов, растворенными в матрице при ТА, и содержание растворенного в аустените хрома составляет по меньшей мере 16%.
10. Изготовленная с помощью порошковой металлургии сталь по п. 1, где сталь при температуре аустенизации, ТА, составляющей 1080°C, имеет вычисленный ЭСТК≥22, где ЭСТК=Cr+3,3Mo+30N, и Cr, Мо и N являются вычисленными равновесными содержаниями, растворенными в матрице при ТА.
11. Изготовленная с помощью порошковой металлургии сталь по любому из пп. 1-10, где сталь при температуре аустенизации, ТА, составляющей 1080°C, имеет вычисленный ЭСТК≥25, где ЭСТК=Cr+3,3Mo+30N, и Cr, Мо и N являются вычисленными равновесными содержаниями, растворенными в матрице при ТА.
12. Способ получения стали, имеющей состав, как определено в любом из пп. 1-11, включающий стадии распыления стального сплава, имеющего химический состав, определенный в любом из предшествующих пунктов, кроме содержания азота, обработки порошка азотированием, чтобы отрегулировать содержание азота в сплаве до содержания, определенного в любом из предшествующих пунктов, загрузки порошка в капсулу и осуществление ГИП капсулы, образования полученной стали и осуществление ее закалки и отпуска.
13. Способ получения стали по п. 12, включающий закалку при 950-1200°C, предпочтительно при 1080-1150°C в течение 30 минут, глубокое охлаждение закаленной стали в жидком азоте и двукратный отпуск при 180-250°C, предпочтительно при 200±10°C в течение 2 часов.
14. Способ получения стали по п. 12, включающий закалку при 950-1200°C, предпочтительно при 1080-1150°C в течение 30 минут, глубокое охлаждение закаленной стали в жидком азоте и двукратный отпуск при 450-550°C, предпочтительно при 500±10°C в течение 2 часов.
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