RU2017120972A - ULTRA-STRENGTH HAZARDED AIR-BASED, MULTI-PHASE STEEL WITH EXCELLENT TECHNOLOGICAL CHARACTERISTICS AND METHOD FOR PRODUCING THE STEELS OF THE SPECIFIED STEEL - Google Patents

ULTRA-STRENGTH HAZARDED AIR-BASED, MULTI-PHASE STEEL WITH EXCELLENT TECHNOLOGICAL CHARACTERISTICS AND METHOD FOR PRODUCING THE STEELS OF THE SPECIFIED STEEL Download PDF

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RU2017120972A
RU2017120972A RU2017120972A RU2017120972A RU2017120972A RU 2017120972 A RU2017120972 A RU 2017120972A RU 2017120972 A RU2017120972 A RU 2017120972A RU 2017120972 A RU2017120972 A RU 2017120972A RU 2017120972 A RU2017120972 A RU 2017120972A
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steel
paragraphs
strip
content
air
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RU2017120972A3 (en
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Томас ШУЛЬЦ
Йоахим ШЁТЛЕР
Саша КЛЮГЕ
Марион БЕХТОЛЬД
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Зальцгиттер Флахшталь Гмбх
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Claims (65)

1. Сверхвысокопрочная закаливающаяся на воздухе, многофазная сталь с минимальным пределом прочности на разрыв в незакаленном на воздухе состоянии, равном 750 МПа, с отличными технологическими характеристиками, включающая элементы (содержание в % по массе):1. Ultrahigh-strength air-hardened, multiphase steel with a minimum tensile strength in a state not hardened in air, equal to 750 MPa, with excellent technological characteristics, including elements (content in% by weight): C ≥ 0,075 до ≤ 0,115C ≥ 0.075 to ≤ 0.115 Si ≥ 0,600 до ≤ 0,750Si ≥ 0.600 to ≤ 0.750 Mn ≥ 1,000 до ≤ 1,950Mn ≥ 1,000 to ≤ 1,950 Cr ≥ 0,200 до ≤ 0,600Cr ≥ 0.200 to ≤ 0,600 Al ≥ 0,010 до ≤ 0,060Al ≥ 0.010 to ≤ 0.060 N ≥ 0,0020 до ≤ 0,0120N ≥ 0.0020 to ≤ 0.0120 S ≤ 0,0030 S ≤ 0,0030 Mo ≥ 0,0200 Mo ≥ 0,0200 Nb ≥ 0,005 до ≤ 0,040Nb ≥ 0.005 to ≤ 0.040 Ti ≥ 0,005 до ≤ 0,030Ti ≥ 0.005 to ≤ 0.030 B ≥ 0,0005 до ≤ 0,0030B ≥ 0.0005 to ≤ 0.0030 Ca ≥ 0,0005 до ≤ 0,0060Ca ≥ 0,0005 to ≤ 0,0060 Cu ≤ 0,050Cu ≤ 0,050 Ni ≤ 0,050,Ni ≤ 0,050, остальное приходится на железо, включая обычные сопровождающие сталь примеси, связанные с плавкой, в которой, что касается возможного наиболее широкого технологического интервала во время непрерывного отжига горячей полосы или холодной полосы, изготовленной из этой стали, суммарное содержание (Mn + Si + Cr + Mo) устанавливается в зависимости от толщины полученной полосы, следующим образом:the rest is iron, including the usual steel-related impurities associated with smelting, in which, as regards the possible widest process interval during continuous annealing of a hot strip or cold strip made of this steel, the total content (Mn + Si + Cr + Mo ) is set depending on the thickness of the obtained strip, as follows: вплоть до 1,00 мм: сумма (Mn + Si + Cr + Mo) ≥ 2,450 и ≤ 2,800%,up to 1.00 mm: sum (Mn + Si + Cr + Mo) ≥ 2,450 and ≤ 2,800%, свыше 1,00 до 2,00 мм: сумма (Mn + Si + Cr + Mo) ≥ 2,600 и ≤ 3,150%,over 1.00 to 2.00 mm: sum (Mn + Si + Cr + Mo) ≥ 2,600 and ≤ 3,150%, свыше 2,00 мм: сумма (Mn + Si + Cr + Mo) ≥ 3,000 и ≤ 3,450%.over 2.00 mm: sum (Mn + Si + Cr + Mo) ≥ 3,000 and ≤ 3.450%. 2. Сталь по п. 1, отличающаяся тем, что при толщине полосы до 1,00 мм содержание C составляет ≤ 0,100% и углеродный эквивалент CEV (IIW) ≤ 0,50%.2. Steel according to claim 1, characterized in that, with a strip thickness of up to 1.00 mm, the content of C is ≤ 0.100% and the carbon equivalent of CEV (IIW) ≤ 0.50%. 3. Сталь по п. 1, отличающаяся тем, что при толщине полосы больше, чем 1,00 до 2,00 мм, содержание C составляет ≤ 0,105% и углеродный эквивалент CEV (IIW) ≤ 0,55%.3. Steel according to claim 1, characterized in that when the strip thickness is more than 1.00 to 2.00 mm, the content of C is ≤ 0.105% and the carbon equivalent of CEV (IIW) ≤ 0.55%. 4. Сталь по п. 1, отличающаяся тем, что при толщине полосы больше, чем 2,00 мм, содержание C составляет ≤ 0,115% и углеродный эквивалент CEV (IIW) ≤ 0,60%.4. Steel according to claim 1, characterized in that when the strip thickness is more than 2.00 mm, the content of C is ≤ 0.115% and the carbon equivalent of CEV (IIW) ≤ 0.60%. 5. Сталь по п. 1 или 2, отличающаяся тем, что при толщине полосы вплоть до 1,00 мм содержание Mn составляет от ≥ 1,000 до ≤ 1,500%.5. Steel according to claim 1 or 2, characterized in that with a strip thickness of up to 1.00 mm, the Mn content is from ≥ 1,000 to ≤ 1,500%. 6. Сталь по п. 1 или 3, отличающаяся тем, что при толщине полосы больше 1,00 и до 2,00 мм содержание Mn составляет от ≥ 1,300 до ≤ 1,700%.6. Steel according to claim 1 or 3, characterized in that when the strip thickness is more than 1.00 and up to 2.00 mm, the Mn content is from ≥ 1,300 to ≤ 1,700%. 7. Сталь по п. 1 или 4, отличающаяся тем, что при толщине полосы больше 2,00 мм, содержание Mn составляет от ≥ 1,600 до ≤ 1,900%.7. Steel according to claim 1 or 4, characterized in that when the strip thickness is more than 2.00 mm, the Mn content is from ≥ 1,600 to ≤ 1,900%. 8. Сталь по любому из пп. 1, 2 и 5, отличающаяся тем, что при толщине полосы вплоть до 1,00 мм содержание Cr составляет от ≥ 0,250 до ≤ 0,350%.8. Steel according to any one of paragraphs. 1, 2 and 5, characterized in that with a strip thickness of up to 1.00 mm, the Cr content is from ≥ 0.250 to ≤ 0.350%. 9. Сталь по любому из пп. 1, 3 и 6, отличающаяся тем, что при толщине полосы больше 1,00 мм и до 2,00 мм содержание Cr составляет от > 0,350 до ≤ 0,450%.9. Steel according to any one of paragraphs. 1, 3 and 6, characterized in that when the strip thickness is more than 1.00 mm and up to 2.00 mm, the Cr content is from> 0.350 to ≤ 0.450%. 10. Сталь по любому из пп. 1, 4 и 7, отличающаяся тем, что при толщине полосы больше 2,00 мм содержание Cr составляет от > 0,450 до ≤ 0,550%.10. Steel according to any one of paragraphs. 1, 4 and 7, characterized in that when the strip thickness is more than 2.00 mm, the Cr content is from> 0.450 to ≤ 0.550%. 11. Сталь по любому из пп. 1 - 10, отличающаяся тем, что при сумме (Ti+ Nb+ B) ≥ 0,010 и до ≤ 0,050% содержание N составляет от ≥ 0,0020 до ≤ 0,0090%.11. Steel according to any one of paragraphs. 1 to 10, characterized in that with the sum of (Ti + Nb + B) ≥ 0.010 and up to ≤ 0.050%, the N content is from ≥ 0.0020 to ≤ 0.0090%. 12. Сталь по любому из пп. 1 - 10, отличающаяся тем, что при сумме (Ti+ Nb+ B) > 0,050% содержание N составляет от ≥ 0,0040 до ≤ 0,0120%.12. Steel according to any one of paragraphs. 1 to 10, characterized in that when the sum (Ti + Nb + B)> 0.050%, the N content is from ≥ 0.0040 to ≤ 0.0120%. 13. Сталь по любому из пп. 1 - 12, отличающаяся тем, что содержание S составляет ≤ 0,0020%.13. Steel according to any one of paragraphs. 1 to 12, characterized in that the content of S is ≤ 0.0020%. 14. Сталь по любому из пп. 1 - 13, отличающаяся тем, что содержание Mo составляет от ≥ 0,050 до ≤ 0,100%.14. Steel according to any one of paragraphs. 1 to 13, characterized in that the Mo content is from ≥ 0.050 to ≤ 0.100%. 15. Сталь по любому из пп. 1 - 14, отличающаяся тем, что сумма Cr+Mo составляет ≤ 0,800%.15. Steel according to any one of paragraphs. 1 to 14, characterized in that the sum of Cr + Mo is ≤ 0.800%. 16. Сталь по любому из пп. 1 - 14, отличающаяся тем, что сумма Cr+Mo составляет ≤ 0,700%.16. Steel according to any one of paragraphs. 1 to 14, characterized in that the sum of Cr + Mo is ≤ 0.700%. 17. Сталь по любому из пп. 1 - 16, отличающаяся тем, что содержание Nb составляет от ≥ 0,015 до ≤ 0,035%.17. Steel according to any one of paragraphs. 1 to 16, characterized in that the Nb content is from ≥ 0.015 to ≤ 0.035%. 18. Сталь по любому из пп. 1 - 17, отличающаяся тем, что содержание Ti составляет от ≥ 0,005 до ≤ 0,025%.18. Steel according to any one of paragraphs. 1 to 17, characterized in that the Ti content is from ≥ 0.005 to ≤ 0.025%. 19. Сталь по любому из пп. 1 - 18, отличающаяся тем, что сумма Nb + Ti составляет ≤ 0,065%.19. Steel according to any one of paragraphs. 1 to 18, characterized in that the sum of Nb + Ti is ≤ 0.065%. 20. Сталь по любому из пп. 1 - 18, отличающаяся тем, что сумма Nb + Ti составляет ≤ 0,055%.20. Steel according to any one of paragraphs. 1 to 18, characterized in that the sum of Nb + Ti is ≤ 0.055%. 21. Сталь по любому из пп. 1 - 20, отличающаяся тем, что содержание бора составляет от ≥ 0,0005 до ≤ 0,0020%.21. Steel according to any one of paragraphs. 1 to 20, characterized in that the boron content is from ≥ 0,0005 to ≤ 0,0020%. 22. Сталь по любому из пп. 1 - 21, отличающаяся тем, что сумма (Ti + Nb + B) составляет ≤ 0,070%.22. Steel according to any one of paragraphs. 1 to 21, characterized in that the sum (Ti + Nb + B) is ≤ 0.070%. 23. Сталь по любому из пп. 1 - 21, отличающаяся тем, что сумма (Ti + Nb + B) составляет ≤ 0,060%.23. Steel according to any one of paragraphs. 1 to 21, characterized in that the sum (Ti + Nb + B) is ≤ 0.060%. 24. Сталь по любому из пп. 1 - 23, отличающаяся тем, что сумма (Ti + Nb + B + Mo + V) составляет ≤ 0,175%.24. Steel according to any one of paragraphs. 1 to 23, characterized in that the sum (Ti + Nb + B + Mo + V) is ≤ 0.175%. 25. Сталь по любому из пп. 1 - 24, отличающаяся тем, что содержание Ca составляет ≤ 0,0030%.25. Steel according to any one of paragraphs. 1 to 24, characterized in that the Ca content is ≤ 0.0030%. 26. Сталь по любому из пп. 1 - 25, отличающаяся тем, что добавки кремния и марганца, в связи с характеристиками прочности, которые должны быть достигнуты, являются взаимозаменяемыми согласно соотношению:26. Steel according to any one of paragraphs. 1 to 25, characterized in that the additives of silicon and manganese, in connection with the strength characteristics that must be achieved, are interchangeable according to the ratio: YS (МПа) = 160,7 + 147,9 [% Si] + 161,1 [% Mn]YS (MPa) = 160.7 + 147.9 [% Si] + 161.1 [% Mn] TS (МПа) = 324,8 + 189,4 [% Si] + 174,1 [% Mn]TS (MPa) = 324.8 + 189.4 [% Si] + 174.1 [% Mn] 27. Способ получения холоднокатаной или горячекатаной стальной полосы из многофазной стали, которая может быть закалена на воздухе по любому из пп. 1 - 26, в котором необходимую микроструктуру получают во время непрерывного отжига, отличающийся тем, что холоднокатаную или горячекатаную стальную полосу нагревают до температуры от 700 до 950°C в течение непрерывного отжига, при этом отожженную стальную полосу последовательно охлаждают от температуры отжига до первой промежуточной температуры от 300 до 500°C со скоростью охлаждения 15 - 100°C/с с последующим охлаждением до второй промежуточной температуры от 160 до 250°C при скорости охлаждения 15 - 100°C/с, затем стальную полосу охлаждают до комнатной температуры при скорости охлаждения от 2 до 30°C/сек, или охлаждают от первой промежуточной температуры до комнатной температуры при поддержании скорости охлаждения 15 - 100°C/с.27. A method of obtaining a cold-rolled or hot-rolled steel strip of multiphase steel, which can be hardened in air according to any one of paragraphs. 1 to 26, in which the necessary microstructure is obtained during continuous annealing, characterized in that the cold-rolled or hot-rolled steel strip is heated to a temperature of from 700 to 950 ° C during continuous annealing, while the annealed steel strip is successively cooled from the annealing temperature to the first intermediate temperatures from 300 to 500 ° C with a cooling rate of 15 - 100 ° C / s followed by cooling to a second intermediate temperature from 160 to 250 ° C at a cooling rate of 15 - 100 ° C / s, then the steel strip is cooled to room t temperatures at a cooling rate of 2 to 30 ° C / s, or cooled from a first intermediate temperature to room temperature while maintaining a cooling rate of 15-100 ° C / s. 28. Способ получения холоднокатаной или горячекатаной стальной полосы из многофазной стали, которая может быть закалена на воздухе по любому из пп. 1 - 26, в котором необходимую структуру получают во время непрерывного отжига, отличающийся тем, что охлаждение прекращают до поступления в ванну горячего окунания, а после рафинирования горячим способом окунания охлаждение продолжают со скоростью охлаждения 15 - 100°C/с до достижения промежуточной температуры от 200 до 250°C, и затем стальную полосу охлаждают на воздухе до достижения комнатной температуры со скоростью охлаждения от 2 до 30°C/с.28. A method of obtaining a cold-rolled or hot-rolled steel strip of multiphase steel, which can be hardened in air according to any one of paragraphs. 1 - 26, in which the necessary structure is obtained during continuous annealing, characterized in that the cooling is stopped until the hot dipping enters the bath, and after refining with the hot dipping method, cooling is continued at a cooling rate of 15-100 ° C / s until an intermediate temperature of 200 to 250 ° C, and then the steel strip is cooled in air until it reaches room temperature with a cooling rate of 2 to 30 ° C / s. 29. Способ получения холоднокатаной или горячекатаной стальной полосы из многофазной стали, которая может быть закалена на воздухе по любому из пп. 1 - 26, в котором необходимую структуру получают во время непрерывного отжига, отличающийся тем, что в случае рафинирования горячим способом окунания, после нагрева и последующего охлаждения до промежуточной температуры от 200 до 250°C, температуру поддерживают в течение 1 - 20 секунд до поступления в ванну горячего окунания, а затем стальную полосу повторно нагревают до температуры от 400 до 470°C, а после рафинирования горячим способом окунания охлаждение проводят со скоростью охлаждения 15 - 100°C/с вплоть до промежуточной температуры от 200 до 250°C с последующим охлаждением на воздухе до комнатной температуры со скоростью охлаждения от 2 до 30°C/с.29. A method of obtaining a cold-rolled or hot-rolled steel strip of multiphase steel, which can be hardened in air according to any one of paragraphs. 1 to 26, in which the necessary structure is obtained during continuous annealing, characterized in that in the case of refining by hot dipping, after heating and subsequent cooling to an intermediate temperature of 200 to 250 ° C, the temperature is maintained for 1 to 20 seconds before arrival into a hot dipping bath, and then the steel strip is reheated to a temperature of 400 to 470 ° C, and after refining with a hot dipping method, cooling is carried out at a cooling rate of 15 - 100 ° C / s up to an intermediate temperature of 200 to 250 ° C with subsequent cooling in air to room temperature with a cooling rate of 2 to 30 ° C / s. 30. Способ по любому из пп. 23 - 25, отличающийся тем, что при непрерывном отжиге с конфигурацией устройства, состоящей из печи непосредственного огневого нагревания и печи с радиантными трубами, потенциал окисления увеличивают путем регулирования содержания CO в печи непосредственного огневого нагревания меньше, чем 4% по объему, причем в печи с радиантными трубами парциальное давление кислорода в атмосфере, восстанавливающей железо, регулируют согласно следующему уравнению,30. The method according to any one of paragraphs. 23 - 25, characterized in that during continuous annealing with the configuration of a device consisting of a direct fire heating furnace and a furnace with radiant tubes, the oxidation potential is increased by controlling the CO content in the direct fire heating furnace is less than 4% by volume, moreover, in the furnace with radiant tubes, the partial pressure of oxygen in the iron-reducing atmosphere is controlled according to the following equation, -18 > Log pO2 ≥ 5* Si-0,3 – 2,2* Mn-0,45 – 0,1* Cr-0,4– 12,5* (-lnB)0,25 -18> Log pO 2 ≥ 5 * Si -0.3 - 2.2 * Mn -0.45 - 0.1 * Cr -0.4 - 12.5 * (-lnB) 0.25 где Si, Mn, Cr, B - соответствующие доли легирующих компонентов в стали, в процентах по массе, и pO2 - парциальное давление кислорода в миллибарах, а температуру конденсации газообразной атмосферы устанавливают равной -30°C или ниже, чтобы предотвратить окисление полосы непосредственно до ее погружения в ванну горячего окунания.where Si, Mn, Cr, B are the corresponding fractions of alloying components in steel, in percent by weight, and pO 2 is the partial pressure of oxygen in millibars, and the condensation temperature of the gaseous atmosphere is set to -30 ° C or lower to prevent oxidation of the strip directly before diving into a hot dipping bath. 31. Способ по любому из пп. 27 - 29, отличающийся тем, что парциальное давление кислорода в атмосфере печи удовлетворяет следующему уравнению, в случае отжига только в одной печи с радиантными трубами,31. The method according to any one of paragraphs. 27 - 29, characterized in that the partial pressure of oxygen in the atmosphere of the furnace satisfies the following equation, in the case of annealing in only one furnace with radiant tubes, -12 > Log pO2 ≥ 5* Si-0,25 – 3* Mn-05 – 0,1* Cr-0,5 – 7* (-lnB)0,5 -12> Log pO 2 ≥ 5 * Si -0.25 - 3 * Mn -05 - 0.1 * Cr -0.5 - 7 * (-lnB) 0.5 где Si, Mn, Cr, B - соответствующие доли легирующих компонентов в стали, в процентах по массе, и pO2 - парциальное давление кислорода в миллибарах, а температуру конденсации газообразной атмосферы устанавливают равной -30°C или ниже, чтобы предотвратить окисление полосы непосредственно до ее погружения в ванну горячего окунания.where Si, Mn, Cr, B are the corresponding fractions of alloying components in steel, in percent by weight, and pO 2 is the partial pressure of oxygen in millibars, and the condensation temperature of the gaseous atmosphere is set to -30 ° C or lower to prevent oxidation of the strip directly before diving into a hot dipping bath. 32. Способ по любому из пп. 27 - 31, отличающийся тем, что в случае полос различной толщины во время непрерывного отжига, сопоставимые микроструктурные состояния и механические характеристики полос регулируют путем согласования пропускной способности устройства в процессе термической обработки.32. The method according to any one of paragraphs. 27 - 31, characterized in that in the case of strips of different thicknesses during continuous annealing, comparable microstructural states and mechanical characteristics of the strips are controlled by coordinating the throughput of the device during the heat treatment. 33. Способ по любому из пп. 27 - 32, отличающийся тем, что стальную полосу пропускают в дрессировочной клети после термической обработки или рафинирования горячим способом окунания.33. The method according to any one of paragraphs. 27 - 32, characterized in that the steel strip is passed in a training stand after heat treatment or refining by hot dipping. 34. Способ по любому из пп. 27 - 33, отличающийся тем, что стальную полосу подвергают изгибу с растяжением после термической обработки или рафинирования горячим способом окунания.34. The method according to any one of paragraphs. 27 - 33, characterized in that the steel strip is subjected to bending with tension after heat treatment or refining by hot dipping. 35. Стальная полоса, полученная способом по любому из пп. 27 - 34, имеющая минимальное значение раздачи отверстия, согласно ISO 16630, равное 20% в состоянии, не упрочненном на воздухе.35. Steel strip obtained by the method according to any one of paragraphs. 27 to 34, having a minimum hole distribution value according to ISO 16630 of 20% in a state not hardened in air. 36. Стальная полоса по п. 35, имеющая минимальное значение раздачи отверстия, согласно ISO 16630, равное 30% в состоянии, не упрочненном на воздухе.36. A steel strip according to claim 35, having a minimum value for the distribution of the hole, according to ISO 16630, equal to 30% in a state not hardened in air. 37. Стальная полоса по п. 35, имеющая минимальное значение угла изгиба согласно VDA 238-100, равное 60° в продольном направлении или поперечном направлении в состоянии, не упрочненном на воздухе.37. A steel strip according to claim 35, having a minimum bending angle according to VDA 238-100 equal to 60 ° in the longitudinal direction or transverse direction in a state not hardened in air. 38. Стальная полоса по любому из пп. 35 - 37, имеющая минимальное значение угла изгиба согласно VDA 238-100, равное 75° в продольном направлении или поперечном направлении в состоянии, не упрочненном на воздухе.38. Steel strip according to any one of paragraphs. 35 to 37, having a minimum bending angle according to VDA 238-100, equal to 75 ° in the longitudinal direction or transverse direction in a state not hardened in air. 39. Стальная полоса по любому из пп. 35 - 38, имеющая минимальное значение произведения Rm x α (предел прочности на разрыв x угол изгиба согласно VDA 238-100) 60000 МПа° в состоянии, не упрочненном на воздухе.39. Steel strip according to any one of paragraphs. 35 - 38, having a minimum product value of Rm x α (tensile strength x bending angle according to VDA 238-100) 60,000 MPa ° in a state not hardened in air. 40. Стальная полоса по п. 38, имеющая минимальное значение произведения Rm x α (предел прочности на разрыв x угол изгиба согласно VDA 238-100) 70000 МПа° в состоянии, не упрочненном на воздухе.40. The steel strip according to claim 38, having a minimum product value Rm x α (tensile strength x bending angle according to VDA 238-100) 70,000 MPa ° in a state not hardened in air. 41. Стальная полоса по любому из пп. 35 - 40, имеющая состояние без замедленного разрушения, по меньшей мере, в течение 6 месяцев, что соответствует нормативу SEP 1970 для испытания на растяжение перфораций и испытания изгиба балки.41. Steel strip according to any one of paragraphs. 35 to 40, having a state without delayed fracture for at least 6 months, which complies with the SEP 1970 standard for tensile testing of perforations and beam bending tests.
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DE102014017275A1 (en) 2016-05-19
RU2682913C2 (en) 2019-03-22
RU2017120972A3 (en) 2018-12-19
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US20180044759A1 (en) 2018-02-15
EP3221478B1 (en) 2023-03-29

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