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RU2016119955A - MARTENSITAL STAINLESS STEEL, ITEMS MADE FROM THE SPECIFIED STEEL AND METHOD FOR THEIR MANUFACTURE - Google Patents

MARTENSITAL STAINLESS STEEL, ITEMS MADE FROM THE SPECIFIED STEEL AND METHOD FOR THEIR MANUFACTURE Download PDF

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RU2016119955A
RU2016119955A RU2016119955A RU2016119955A RU2016119955A RU 2016119955 A RU2016119955 A RU 2016119955A RU 2016119955 A RU2016119955 A RU 2016119955A RU 2016119955 A RU2016119955 A RU 2016119955A RU 2016119955 A RU2016119955 A RU 2016119955A
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stainless steel
martensitic stainless
trace amounts
steel according
semi
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RU2016119955A
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Сильвен Пьер ПЮШ
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Обер Э Дюваль
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
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    • C21D2211/008—Martensite

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Claims (53)

1. Мартенситная нержавеющая сталь, отличающаяся тем, что ее состав, в массовых процентах, содержит:1. Martensitic stainless steel, characterized in that its composition, in mass percent, contains: - следовые количества≤C≤0,030%;- trace amounts≤C≤0,030%; - следовые количества≤Si≤0,25%;- trace amounts ≤ Si ≤ 0.25%; - следовые количества≤Mn≤0,25%;- trace amounts≤Mn≤0.25%; - следовые количества≤S≤0,020%;- trace amounts≤S≤0,020%; - следовые количества≤P≤0,040%;- trace amounts≤P≤0,040%; - 8%≤Ni≤14%;- 8% ≤Ni≤14%; - 8%≤Cr≤14%;- 8% ≤Cr≤14%; - 1,5%≤Mo+W/2≤3,0%;- 1.5% ≤Mo + W / 2≤3.0%; - 1,0%≤Al≤2,0%;- 1.0% ≤Al≤2.0%; - 0,5%≤Ti≤2,0%;- 0.5% ≤Ti≤2.0%; - 2%≤Co≤9%;- 2% ≤Co≤9%; - следовые количества≤N≤0,030%;- trace amounts≤N≤0,030%; - следовые количества≤O≤0,020%;- trace amounts≤O≤0,020%; причем остальное количество составляют железо и примеси, внесенные при производстве стали;the remaining amount being iron and impurities introduced in the production of steel; и что ее температура Ms начала мартенситного превращения, рассчитываемая по формулеand that its temperature Ms of the onset of martensitic transformation, calculated by the formula (1) Ms (°C)=1302-28Si-50Mn-63Ni-42Cr-30Mo+20Al-12Co-25Cu+10[Ti-4(C+N)],(1) Ms (° C) = 1302-28Si-50Mn-63Ni-42Cr-30Mo + 20Al-12Co-25Cu + 10 [Ti-4 (C + N)], причем содержание различных элементов выражены в массовых процентах, является большей или равной 50°С, предпочтительно большей или равной 75°С.moreover, the content of various elements expressed in mass percent is greater than or equal to 50 ° C, preferably greater than or equal to 75 ° C. 2. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤C≤0,010%.2. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤C≤0.010%. 3. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤Si≤0,10%.3. The martensitic stainless steel according to claim 1, characterized in that the trace amounts of S Si 0 0.10%. 4. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤Mn≤0,10%.4. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤Mn≤0.10%. 5. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤S≤0,005%.5. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤S≤0.005%. 6. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤P≤0,020%.6. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤P≤0.020%. 7. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 11,3%≤Ni≤12,5%.7. Martensitic stainless steel according to claim 1, characterized in that 11.3% ≤Ni≤12.5%. 8. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 8,5%≤Cr≤10%.8. Martensitic stainless steel according to claim 1, characterized in that 8.5% ≤Cr≤10%. 9. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 1,5%≤Mo+W/2≤2,5%.9. Martensitic stainless steel according to claim 1, characterized in that 1.5% ≤Mo + W / 2≤2.5%. 10. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 1,0%≤Al≤1,5%.10. Martensitic stainless steel according to claim 1, characterized in that 1.0% ≤Al≤1.5%. 11. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 1,10%≤Ti≤1,55%.11. Martensitic stainless steel according to claim 1, characterized in that 1.10% ≤Ti≤1.55%. 12. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 2,5%≤Co≤6,5%.12. Martensitic stainless steel according to claim 1, characterized in that 2.5% ≤Co≤6.5%. 13. Мартенситная нержавеющая сталь по п. 12, отличающаяся тем, что 2,50%≤Co≤3,50%.13. Martensitic stainless steel according to claim 12, characterized in that 2.50% ≤ Co ≤ 3.50%. 14. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤N≤0,0060%.14. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤N≤0.0060%. 15. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что следовые количества≤O≤0,0050%.15. Martensitic stainless steel according to claim 1, characterized in that the trace amounts are ≤O≤0.0050%. 16. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что 1,05%≤Al≤2,0%.16. Martensitic stainless steel according to claim 1, characterized in that 1.05% ≤Al≤2.0%. 17. Мартенситная нержавеющая сталь по п. 16, отличающаяся тем, что 1,05%≤Al≤1,5%.17. The martensitic stainless steel according to claim 16, characterized in that 1.05% ≤Al≤1.5%. 18. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что Creq/Nieq≤1,05, при18. Martensitic stainless steel according to claim 1, characterized in that Creq / Nieq≤1.05, at Cr eq=Cr+2Si+Mo+1,5Ti+5,5Al+0,6WCr eq = Cr + 2Si + Mo + 1.5Ti + 5.5Al + 0.6W Ni eq=2Ni+0,5Mn+30C+25N+Co+0,3CuNi eq = 2Ni + 0.5Mn + 30C + 25N + Co + 0.3Cu 19. Мартенситная нержавеющая сталь по п. 1, отличающаяся тем, что доля дельта-феррита в ее микроструктуре является меньшей или равной 1%.19. The martensitic stainless steel according to claim 1, characterized in that the proportion of delta ferrite in its microstructure is less than or equal to 1%. 20. Способ изготовления детали из мартенситной нержавеющей стали, отличающийся тем, что:20. A method of manufacturing a part from martensitic stainless steel, characterized in that: - получают стальной полуфабрикат, имеющий состав по одному из пп. 1-19, одним из следующих способов:- get the steel semi-finished product having a composition according to one of paragraphs. 1-19, in one of the following ways: * получают жидкую сталь, имеющую состав по одному из пп. 1-19, и из этой жидкой стали отливают и отверждают отливку, и преобразуют ее в стальной полуфабрикат по меньшей мере одним горячим преобразованием;* get liquid steel having a composition according to one of paragraphs. 1-19, and casting is cast and cured from this molten steel, and is converted into a steel semi-finished product by at least one hot conversion; * способом порошковой металлургии получают спеченный полуфабрикат из стали, имеющей состав по одному из пп. 1-19;* by the method of powder metallurgy, a sintered semi-finished product is obtained from steel having a composition according to one of claims. 1-19; - достигают полной термической обработки на твердый раствор полуфабриката с образованием аустенитного домена, при температуре, составляющей между 800 и 940°С;- achieve complete heat treatment for the solid solution of the semi-finished product with the formation of the austenitic domain, at a temperature of between 800 and 940 ° C; - проводят закалку полуфабриката до конечной температуры закалки, меньшей или равной -60°С;- conduct hardening of the semi-finished product to a final hardening temperature less than or equal to -60 ° C; - выполняют дисперсионное твердение при температуре между 450 и 600°С в течение времени от 4 до 32 часов.- perform dispersion hardening at a temperature between 450 and 600 ° C for a time from 4 to 32 hours. 21. Способ по п. 20, отличающийся тем, что закалку полуфабриката проводят до конечной температуры закалки, меньшей или равной -75°С.21. The method according to p. 20, characterized in that the hardening of the semi-finished product is carried out to a final hardening temperature of less than or equal to -75 ° C. 22. Способ по п. 20, отличающийся тем, что отливают и отверждают отливку, и что между затвердеванием отливки и термической обработкой на твердый раствор полуфабриката проводят гомогенизацию отливки или полуфабриката при температуре 1200-1300°С в течение по меньшей мере 24 часов.22. The method according to p. 20, characterized in that the casting is cast and cured, and that between the solidification of the casting and heat treatment of the solid solution of the semi-finished product, the casting or the semi-finished product is homogenized at a temperature of 1200-1300 ° C for at least 24 hours. 23. Способ по п. 20, отличающийся тем, что между закалкой и дисперсионным твердением выполняют холодное преобразование полуфабриката.23. The method according to p. 20, characterized in that between the hardening and dispersion hardening perform cold conversion of the semi-finished product. 24. Способ по п. 20, отличающийся тем, что закалку проводят в две стадии, в двух различных закалочных средах.24. The method according to p. 20, characterized in that the hardening is carried out in two stages, in two different quenching media. 25. Способ по п. 24, отличающийся тем, что первую стадию закалки проводят в воде.25. The method according to p. 24, characterized in that the first stage of hardening is carried out in water. 26. Способ по п. 20, отличающийся тем, что жидкую сталь получают двойной обработкой с плавкой в вакууме, причем вторая обработка в вакууме представляет собой обработку способом электрошлаковой переплавки (ESR) или вакуумного дугового переплава (VAR).26. The method according to p. 20, characterized in that the molten steel is obtained by double processing with melting in vacuum, and the second processing in vacuum is a treatment by electroslag remelting (ESR) or vacuum arc remelting (VAR). 27. Деталь из мартенситной нержавеющей стали, отличающаяся тем, что она получена способом по одному из пп. 20-26.27. Part of martensitic stainless steel, characterized in that it is obtained by the method according to one of paragraphs. 20-26. 28. Деталь из мартенситной нержавеющей стали по п. 27, отличающаяся тем, что она представляет собой авиационную конструкционную деталь.28. Part of martensitic stainless steel according to p. 27, characterized in that it is an aircraft structural part.
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