WO2019086934A1 - Acier inoxydable martensitique, et son procédé de fabrication - Google Patents
Acier inoxydable martensitique, et son procédé de fabrication Download PDFInfo
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- WO2019086934A1 WO2019086934A1 PCT/IB2017/056865 IB2017056865W WO2019086934A1 WO 2019086934 A1 WO2019086934 A1 WO 2019086934A1 IB 2017056865 W IB2017056865 W IB 2017056865W WO 2019086934 A1 WO2019086934 A1 WO 2019086934A1
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Definitions
- the present invention relates to a martensitic stainless steel and its method of manufacture.
- This steel is more particularly, but not exclusively, intended for use in the automotive industry, to form parts such as body parts, intended to deform during an impact by absorbing a maximum amount of energy.
- martensitic stainless steels shaped by hot stamping from a sheet may be used. They have the advantage of having a very high mechanical strength Rm, and thus allow a lightening of the body, with equal performance compared to steels more conventionally used in the past.
- the martensitic stainless steels known for this purpose have the disadvantage of having a limited folding capacity. As a result, they do not have the possibility of satisfactorily absorbing the energy received by the vehicle during an impact and the requirements imposed by the regulations on this subject, verified during impact tests ("crash" -tests "), are difficult to satisfy.
- This folding capacity of the steel is usually appreciated by three-point folding tests carried out according to the NF EN ISO 7438 standard and the VDA 238-100 procedure.
- the punch is brought into contact with the sheet, itself supported by two rollers, with a pre-force of 30 N. Once the contact is established, the displacement of the punch is indexed to zero. The test then consists in moving the punch so as to perform the "three-point folding" of the sheet.
- the test stops when a micro-cracking of the sheet leads to a force drop on the punch of at least 30 N, or when the punch has moved 14.2 mm, which corresponds to the stroke maximum allowed.
- the sheet sample is thus folded.
- the ductility in service is then evaluated by measuring the bending angle at 10 %, in degrees. The higher the angle at 10 %, the better the crimping or folding ability of the sheet.
- the object of the invention is to propose a martensitic stainless steel composition and microstructure which make it well adapted to the use just mentioned, in that it would have a good V-shaped folding ability characterized by the aforementioned standard, and a high bending angle ⁇ , as well as sufficiently high strength properties Rm.
- the subject of the invention is a martensitic stainless steel, characterized in that its composition is, in percentages by weight:
- microstructure comprises at least 75% of martensite, at most 20% of ferrite and at most 0.5% of carbides, the size of the ferrite grains being between 4 and 80 ⁇ m, preferably between 5 and 40 ⁇ m. ⁇ . According to a variant of the invention, traces ⁇ Cu ⁇ 0.5%.
- the invention also relates to a method for preparing a martensitic stainless steel product, characterized in that:
- austenitizing said hot and / or cold processed steel bringing it to a temperature between Ac1 and 1100 ° C for 10 s to 1 h, preferably 2 min to 10 min for reheating in an oven 30 s to 1 min for an induction furnace, with a heating rate of at least 5 ° C / s, the duration of the austenitization being adjusted to obtain, in the steel as a whole, an austenitic microstructure containing at most 0.5% of carbides in volume fraction and at most 20% of residual ferrite in volume fraction;
- Said steel can be converted into a hot-rolled and / or cold-rolled sheet.
- Said hot-rolled and / or cold-rolled sheet may have a thickness of 0.5 to 12 mm, preferably 0.5 to 4 mm.
- the hot and / or cold processed steel can be brought to a temperature of between Ac 1 + 100 ° C. and 1050 ° C. for 10 s to 1 h.
- a further thermal treatment is carried out on the austenitized steel and then quenched at a temperature of 90 to 250 ° C. for 10 s to 1 h.
- the invention is based on the coupling between a steel composition and a particular microstructure.
- This coupling makes it possible, in particular, to prepare sheets that can be easily shaped by hot stamping, and to have a very good compromise between a high tensile strength Rm and a high end-state martensitic folding ability. translating by a folding angle ⁇ also high, measured according to the NF EN ISO 7438 standard and the VDA 238-100 procedure.
- These sheets are particularly well suited for use as automotive body elements having a high energy absorption capacity during shocks to the vehicle.
- the measurement of the product "Rm x ⁇ / 180”, Rm expressed in MPa and ⁇ in degrees, which should be as high as possible, would be a good indicator of the steel's ability to reach such a compromise.
- the minimum C content of 0.05% is justified by the need to obtain austenitization of the microstructure during the first stage of the manufacturing process, therefore before quenching. This will govern the mechanical properties of the sheet, including its ability to be shaped and its mechanical strength.
- a content of more than 0.30% is undesirable so as not to weaken the hardened formed martensite quenching (which would reduce the folding ability) and degrade the weldability, which would be a disadvantage for the preferred application of the invention to the automobile.
- a maximum content of 0.20% is, however, preferred, to better ensure a completely satisfactory folding angle when other conditions required by the invention on the composition of the steel and / or the treatments. thermal damage is close to the set limits.
- the minimum Mn content of 0.20% makes it possible to obtain the necessary austenitization. Above 2.0% of oxidation problems are to be feared during thermal treatments if they are not carried out in neutral or reducing atmospheres. The obligatory use of neutral atmospheres can result in a high cost for the execution of heat treatments. In addition, the manganese in an amount greater than 2.0% is unfavorable to obtaining the desired martensitic structure because of the possible presence of residual austenite after quenching.
- Si content is between traces and 1.0%. Silicon can be used as a deoxidizer during the elaboration, just like Al, to which it can be added or substituted. Above 1, 0%, it is considered that it excessively promotes the formation of ferrite and thus makes it more difficult to austenitize, and that it weakens the sheet too much so that the shaping of a complex piece can certainly proceed satisfactorily. Moreover, the total content of Mn and Si must not exceed 1, 5%. As Mn and Si are both segregating elements, a too strong total presence of Mn and Si could adversely affect the homogeneity of the martensitic microstructure, particularly depending on the thickness of the piece if it is relatively high. The minimum content of Mn + Si is 0.2%, since Mn is necessarily present at a content of at least 0.2%, as seen above.
- P content is between traces and 0.04%, to ensure that the final product will not be excessively fragile. P is also detrimental to weldability and increases the fragility of ferrite and martensite at grain boundaries.
- Its Cr content is between 10.5 and 17.0%. The minimum content of 10.5% is justified to ensure the stainless steel sheet. A content greater than 17% would make austenitization difficult and unnecessarily increase the cost of steel.
- Ni content is between traces and 4.0%.
- Its Mo content is between traces and 2.0%, preferably 1.0%.
- Mo is not essential. But Mo is in favor of a good resistance to corrosion. Above 2.0%, austenitization would be hampered and the cost of steel unnecessarily increased. A maximum content of 1.0% is preferred since Mo is a weakening element in that it limits the diffusion of hydrogen, which can thus be more difficult to remove from the metal.
- W Its content of W is defined according to that of Mo by the respect of the trace relation Mo Mo + 2W 2,0 2.0%, preferably traces Mo Mo + 2W 1 1.0%.
- the advantages and disadvantages of W are qualitatively comparable to those of Mo.
- Cu content is between traces and a maximum of 2.0%, with a preference for a content ⁇ 0.5% if the steel is intended to manufacture a part to be welded.
- the sum Cu + Co should not exceed 2.0%, and the sum Cu + Co + Ni should not exceed 4.0%.
- Ti is a deoxidizer, like Al and Si, but its cost and its lower efficiency than that of Al for deoxidation, with equal added quantity, makes its use in general unattractive from this point of view.
- Ti may, however, have an interest in that the formation of Ti nitrides and carbonitrides can limit grain growth and favorably influence certain mechanical properties and weldability.
- this formation may be a disadvantage in the case of the process according to the invention, since Ti tends to hinder the austenitization due to the formation of carbides, and the TiN degrade the resilience and the folding capacity. A maximum content of 0.5% is therefore not to be exceeded.
- V content is between traces and 0.3%.
- V and Zr are embrittling elements which are capable of forming nitrides, and must not be present in too large amounts, alone and in combination. On this last point, the following limit must be satisfied: traces ⁇ Ti + V + Zr ⁇ 0.5%
- Al is usually used as a deoxidizer during processing. It is not necessary that after the deoxidation there remain in the steel an amount exceeding 0,2%, because there would be a risk of forming an excessive amount of AIN degrading the mechanical properties, and also to have difficulties in obtain the majority martensitic microstructure because Al is very ferritic.
- the requirements on the O content are those which are conventional on martensitic stainless steels, depending on the ability to form them without cracks starting from the inclusions, and the quality of the mechanical properties. of bending sought on the final piece, and that the excessive presence of oxidized inclusions is likely to alter.
- a maximum Ca content of 20 ppm is tolerated.
- the addition of this element is not justified for reasons that would be related to the final properties of the steel. But it may be present following the development of liquid steel, if it was used, as is conventional, for the deoxidation of the liquid steel and the control of the composition and morphology of the inclusions oxidized.
- Nb content is between traces and 0.3%, as well as its Ta content.
- Ta being a very close element of Nb with respect to its metallurgical effects, in particular the formation of carbonings, we will satisfy the relation 0.25 ⁇ (Nb + Ta) / (C + N) ⁇ 8.
- Nb and Ta are important elements for obtaining good resilience and folding ability, and at least one of them must be significantly present. But since they can interfere with austenitization, they must not be present in quantities exceeding what has just been prescribed. These elements also capture C and N, and their total content must be adjusted according to the C and N contents actually present in the steel. If there are too few Nb and / or Ta in the steel when the C and N contents are relatively high, there is not enough dissolved Nb and Ta for these elements to sufficiently improve the resilience.
- Co content is between traces and 0.5%.
- This element is, like Cu, likely to help with austenitization. But do not put too much not to deteriorate the weldability if the steel is intended to be transformed into a piece to be welded. Otherwise, a Co content of not more than 2.0% is acceptable, provided, as stated, not to exceed a total Cu + Co content of 2.0% and a total Cu + Co + Ni of 4.0%, so as not to end up with a too high content of residual austenite.
- Sn content is between traces and 0.05%. This element is not desired because it is detrimental to the weldability and the ability of the steel to be hot processed.
- the limit of 0.05% is a tolerance which, in practice, will most often correspond to a lack of voluntary addition.
- B is not obligatory, but its presence is advantageous for hardenability and forgeability of austenite. It therefore facilitates hot formatting. Its addition above 0.1% however does not bring significant additional improvement on this point, and increases the risk of precipitation in the form of boron nitrides, which would be unfavorable for shaping.
- H content is between traces and 5 ppm (0.0005%), preferably not more than 1 ppm (0.0001%) and more preferably not more than 0.1 ppm (0.00001%).
- N content is between traces and 0.2%.
- N is an impurity whose same treatments that make it possible to reduce the H content contribute to limiting the presence, or even substantially reducing it. It is not always necessary to have a particularly low N content, but its content, taken together with elements with which it can combine to form nitrides or carbonitrides, must not be too high. This results in the relation 0.25 ((Nb + Ta) / (C + N) ⁇ 8 seen above, the respect of which contributes to provide sufficient resilience.
- the rare earths and Y improve the properties of resistance to oxidation (lower oxidation kinetics, therefore less oxide formed), which can be an advantage during hot forming.
- the nonmetallic inclusions that they form generate serious problems with the casting, or, further downstream, during the stripping, because of the great reactivity of the rare earths and Y
- the potential total addition of rare earths and Y is limited to 0.06%.
- the price of these elements is that it is, in any case, generally preferable to use more common elements, such as Al or Si, to ensure deoxidation.
- the sheets prepared according to the invention may be coated sheets, the coating (generally by Zn, or Al, or alloys of which one and / or the other are among the main components ) that can take place before or after shaping the sheet.
- the coating techniques employable do not differ from those usually practiced on steels (immersion in a molten bath of AI, or Zn, or one of their alloys, electrodeposition, CVD / PVD).
- This coating typically of thickness from 1 to 200 ⁇ and present on one or both sides of the sheet, may have been deposited by any technique conventionally used for this purpose. Simply, if it was deposited before the austenitization, it does not evaporate during the stay of the sheet at austenitization temperatures, which can sometimes happen even if this stay is short.
- the steel having the composition according to the invention is prepared, cast and heat-treated conventionally, for example formed into hot-rolled and / or cold-rolled sheets in a typical thickness range of 0.5 mm. at 12 mm.
- the preferred thickness will be in the range 0.5 to 4 mm.
- the transformed product thus obtained initially undergoes austenitization, which carries it in a range of temperatures between the temperature Ac1 appearance of austenite during heating and 1100 ° C, ideally between Ac1 + 100 ° C and 1050 ° C, for a period ranging from 10 s to 1 h to both ensure complete austenitization and limit the oxidation of the product as well as the energy cost of austenitization.
- this austenitization temperature must concern the entire volume of the sheet, and that the treatment must be sufficiently long so that, given the thickness of the sheet and the kinetics of the transformation, the Austenitization is complete throughout this volume. This is, of course, valid for a half-product different from a sheet.
- the furnace where the austenitization takes place may be a conventional furnace or an induction furnace which allows rapid and homogeneous heating, but the heating rates must be greater than 5 ° C / s to avoid coalescence of the carbide precipitates already present. , which would slow down their dissolution during austenitization.
- the desire not to impose a too long total duration to the austenitization step also motivates this minimum heating rate.
- the atmosphere is, in the standard case, air, and the conditions of time and temperature are optimized to limit oxidation while ensuring complete austenitization.
- a non-oxidizing, therefore neutral or reducing, atmosphere nitrogen, argon, CO, hydrogen and their mixtures, preferably in air, makes it possible to increase the treatment temperature without damage, which makes it possible to ensure complete austenitization by a minimum of time. If we use an atmosphere hydrogenated, it must be ensured that it does not lead to a recovery of hydrogen by the metal that would exceed the limits prescribed above.
- the austenitization takes place at a temperature of between 925 ° C. and 1000 ° C. for a duration of 10 s to 1 h (this time being that the sheet passes over Ac1), preferably between 2 min and 10 min for heating in a conventional oven and between 30 s and 1 min for an induction furnace.
- An induction furnace has the advantage, known in itself, of providing rapid heating up to the nominal austenitization temperature. In addition, it concerns from the outset the entire volume of the sheet, and therefore allows a treatment shorter than a conventional oven to achieve the desired result. These temperatures and times make it possible to ensure that the rest of the treatments will lead to a sufficient formation of martensite, and this for a reasonable duration allowing a good productivity of the process.
- This austenitization is to pass all the metal of the initial ferrite + carbide microstructure to an austenitic microstructure containing at most 0.5% of carbides in volume fraction, and at most 20% of residual ferrite in volume fraction.
- One aim of this austenitization is, in particular, to lead to a dissolution of at least the majority of carbides initially present, so as to release C atoms to form the martensitic structure during the subsequent steps of the process.
- the maximum residual ferrite content of 20% which must remain up to the final product, is justified by the resilience and the conventional yield strength that is desired.
- the duration of the austenitization is adjusted so that this microstructure is obtained in all the treated steel, and can therefore vary according to the precise dimensions of the semi-finished product at this stage. The skilled person can easily make this adjustment by modeling and / or experiments conducted on the installation at his disposal, for a half-product of given shapes and dimensions.
- the temperature Ac1 depends on the chemical composition, and also on the heating rate. It is measured, as is known, by following the expansion of a sample during a heating performed at a preset heating rate of between 10 and 100 ° C./s.
- the semi-products are quenched, from the austenitization temperature, either in the open air, calm or pulsed, or by immersing in a tray of water or oil at room temperature, either in the shaping tools in the case of using a hot forming method such as hot stamping.
- the objective is to obtain, throughout the volume of the semi-finished product, a cooling rate of between 0.5 and 1000 ° C./s up to a temperature lower than the start temperature of the martensitic transformation, which is typically about 300 ° C, then cooling between 0.5 and 20 ° C / s to room temperature.
- MS depends on the composition of the steel and can be determined, conventionally, by formulas and models or dilatometric tests.
- Cooling to room temperature is the most common case. Usually, a special control of the cooling rate below Ms is not necessary.
- Absorption capacity in impact test measured by the relation (Rm x bend angle / 180 °) greater than 450, where Rm is expressed in MPa and the bending angle in degrees, measured according to the VDA 238-100 standard on a sample of thickness 1, 5mm.
- composition of the aforementioned steel and a suitable microstructure of this steel obtained by the austenitization-quenching treatment described, which is at least 75% martensitic, and contains at most 20% of ferrite whose grain size is from 1 to 80 ⁇ , preferably from 5 to 40 ⁇ , and a volume fraction of carbides of at most 0.5%.
- the residual austenite fraction that can be tolerated after quenching is therefore at most about 5%, corresponding to C iil the iitt om p osons seonnvenon
- an additional heat treatment can be carried out on the final part, therefore after cooling to the ambient, to improve its elongation at break and bring it to a value of more than 10% and without reducing the mechanical characteristics and the capacity in folding.
- This treatment consists in making the final part stay between 90 ° C and 250 ° C for 10 s to 1 h.
- This additional treatment can also be undergone during hardening by painting annealing (bake hardening), whose temperatures and times are in this range, typically 180 ° C and 20 min. These treatments and the cooling that follows are carried out under calm air, therefore at a cooling rate of the order of a few ° C / s.
- Table 1 shows steel compositions which were applied after hot forming and rolling under similar and conventional conditions, followed by furnace annealing under an inert hydrogen atmosphere at 800 ° C for 5 hours. hours on the hot rolled product, then a cold rolling up to 1, 5mm:
- annealing at 800 ° C. for 15 min, without quenching, followed by stripping.
- the following heat treatment according to the invention raised to 950 ° C. at a heating rate of 20 ° C./s, austenitization at 950 ° C. for 5 min, quenching up to 300 ° C. at a cooling rate of 10 ° C. ° C / s in the air; this treatment may or may not be preceded by the reference treatment and stripping.
- Table 2 shows, for the steels in Table 1, how they satisfy or not the relations required by the invention. The values outside the invention are underlined.
- Table 3 shows the metallurgical structures obtained after the heat treatments carried out on the different steels of Table 1.
- the underlined values are those which make that the examples concerned are not considered as conforming to the invention, from the point of view of their microstructure.
- Table 3 Microstructural Characteristics of Table 1 Steels after Heat Treatments
- Table 4 shows the properties of the examples according to the invention, and those of the reference examples which do not satisfy all the relations and do not reach all the properties that the invention aims to obtain.
- the underlined values are those which are not satisfactory with regard to the criteria mentioned above. Resilience tests were not carried out on the steels which had an insufficient martensite content which placed them in any case outside the invention.
- Reference steels 9 to 13 are martensitic non-stainless steels (therefore not belonging to the class of the steels of the invention and the other reference steels 14 and 15) of known type, commonly used in the field of the automobile. They were tested in order to show how the properties of the steels of the invention were in relation to theirs.
- the reference steels 9 to 12 have compositions in accordance with the invention on elements other than Cr taken alone. But they do not contain enough Nb + Ta with respect to the sum C + N, not enough Mn + Si (except the 9, and just) and too much Mn with respect to S. Those who have undergone a heat treatment according to the invention, at 950 ° C for 5 min, are nevertheless found with a suitable microstructure. Their martensitic fold angles are correct, but at the same time their Rm is not high enough to provide them with shock absorption capacity that would meet expectations.
- the reference steel 13 has, in addition, a C content too high. As expected, the bending angle is even lower than those of other examples of non-stainless martensitic steels that have undergone the same heat treatment. In the shock test, its very high Rm does not compensate for this poor folding ability.
- the reference steels 14 and 15 are martensitic stainless steels.
- the 14 has a measured C content which is only very little less than the minimum required by the invention, and which could be assimilated to this minimum. However, it does not respect the binding relationship Mn, Ni, Cr, C and N. At the end of the heat treatment performed under conditions that would be in accordance with the invention, it is found with a ferrite content too high. Accordingly, if its bending angle is correct, its Rm is, by far, not high enough to provide sufficient shock absorption capacity.
- the reference steel has a lower C content than required by the invention, which provides a substantially ferritic microstructure after the heat treatment. The virtual absence of Nb and Ta gives it a lower ratio (Nb + Ta) / (C + N) than the invention requires.
- the treatment at 950 ° C. for 5 minutes followed by quenching is in accordance with the invention.
- the result is a steel that meets the requirements of the invention in all respects.
- its angle of folding of 135 ° is very high, and as its Rm is correct, its absorption capacity in shock test is excellent.
- the steel 3 according to the invention has also undergone different heat treatments, one according to the invention at 950 ° C for 5 min, the other according to the reference treatment.
- the treatment according to the invention has made it possible to obtain on the steel 3 properties that are satisfactory from all points of view with regard to the objectives aimed at, with a structure that is almost entirely martensitic, to be linked to the lower presence of Si than in the 1 steel, and a small ferritic grain size.
- heat treatment only led to poor Rp 0.2 and Rm properties, insufficient to ensure good shock absorption capacity despite high folding ability.
- Steel 8 according to the invention which is relatively rich in C, Nb and V, has also undergone the same two heat treatments as steel 3.
- its structure is integrally martensitic. Its elongation at break and its bending angle are only correct, but its high Rm gives it sufficient shock absorption capacity. If we apply the reference heat treatment, its structure is fully ferritic. The high bending angle is not accompanied by a sufficient Rm for the shock absorbing ability to be adequate.
- the steel 6 according to the invention is distinguished from the other examples by a C content of 0.24%, therefore even higher than that of the steel 8. Its structure is almost exclusively martensitic after the application of the heat treatment according to the invention. the invention. Its folding angle is just sufficient because of the high C content which is not in the preferred range for the invention, but its very high Rm nevertheless gives it a good shock absorbing capacity.
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Abstract
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JP2020524610A JP2021503545A (ja) | 2017-11-03 | 2017-11-03 | マルテンサイト系ステンレス鋼及びその製造方法 |
KR1020207015883A KR20200077583A (ko) | 2017-11-03 | 2017-11-03 | 마르텐사이트계 스테인리스강 및 그 제조 방법 |
US16/761,158 US11702717B2 (en) | 2017-11-03 | 2017-11-03 | Martensitic stainless steel and method for producing the same |
CN201780098122.0A CN111902551A (zh) | 2017-11-03 | 2017-11-03 | 马氏体不锈钢及其制造方法 |
EP17809010.6A EP3704280B1 (fr) | 2017-11-03 | 2017-11-03 | Acier inoxydable martensitique, et son procédé de fabrication |
BR112020008649-5A BR112020008649B1 (pt) | 2017-11-03 | 2017-11-03 | Aço inoxidável martensítico e método para preparar um produto de aço inoxidável martensítico |
PCT/IB2017/056865 WO2019086934A1 (fr) | 2017-11-03 | 2017-11-03 | Acier inoxydable martensitique, et son procédé de fabrication |
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EP (1) | EP3704280B1 (fr) |
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US20230059069A1 (en) * | 2021-08-06 | 2023-02-23 | Halliburton Energy Services, Inc. | High strength stainless steel material |
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JP7490251B2 (ja) * | 2019-03-12 | 2024-05-27 | 国立大学法人大阪大学 | 固相接合用耐候性鋼、固相接合用耐候性鋼材、固相接合構造物及び固相接合方法 |
JP7018537B1 (ja) * | 2021-08-19 | 2022-02-10 | 日本冶金工業株式会社 | 溶接性に優れる析出硬化型マルテンサイト系ステンレス鋼とその製造方法 |
CN113897546A (zh) * | 2021-09-17 | 2022-01-07 | 温州瑞银不锈钢制造有限公司 | 一种17-4ph不锈钢 |
CN114438402B (zh) * | 2021-12-24 | 2023-03-28 | 西安陕鼓动力股份有限公司 | 用于低温高酸性工况的能量回收透平叶片材料及制备方法 |
KR20240019488A (ko) * | 2022-08-04 | 2024-02-14 | 주식회사 포스코 | 고내식 고강도 스테인리스강 및 이의 제조방법 |
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EP0083254A2 (fr) * | 1981-12-25 | 1983-07-06 | Hitachi, Ltd. | Acier résistant aux températures élevées |
EP1199374A1 (fr) * | 2000-10-18 | 2002-04-24 | Shimano Inc. | Acier inoxydable pour rotor de frein à disque |
JP2004052060A (ja) * | 2002-07-23 | 2004-02-19 | Hitachi Ltd | 蒸気タービン翼,蒸気タービン及び高強度マルテンサイト鋼 |
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JPH07138704A (ja) | 1993-11-12 | 1995-05-30 | Nisshin Steel Co Ltd | 高強度高延性複相組織ステンレス鋼およびその製造方法 |
JP4094388B2 (ja) | 2002-09-09 | 2008-06-04 | エヌケーケーシームレス鋼管株式会社 | 高強度高靭性高クロム継目無鋼管の製造方法 |
JP4832834B2 (ja) | 2005-09-05 | 2011-12-07 | 新日鐵住金ステンレス株式会社 | 焼き入れ性に優れた耐熱ディスクブレーキ用マルテンサイト系ステンレス鋼板 |
CN102260826B (zh) | 2010-05-28 | 2013-06-26 | 宝山钢铁股份有限公司 | 一种耐高温马氏体不锈钢及其制造方法 |
JP6226081B2 (ja) | 2015-07-10 | 2017-11-08 | Jfeスチール株式会社 | 高強度ステンレス継目無鋼管およびその製造方法 |
ES2805067T3 (es) * | 2016-04-22 | 2021-02-10 | Aperam | Procedimiento de fabricación de una pieza de acero inoxidable martensítico a partir de una chapa |
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EP1199374A1 (fr) * | 2000-10-18 | 2002-04-24 | Shimano Inc. | Acier inoxydable pour rotor de frein à disque |
JP2004052060A (ja) * | 2002-07-23 | 2004-02-19 | Hitachi Ltd | 蒸気タービン翼,蒸気タービン及び高強度マルテンサイト鋼 |
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US20230059069A1 (en) * | 2021-08-06 | 2023-02-23 | Halliburton Energy Services, Inc. | High strength stainless steel material |
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KR20200077583A (ko) | 2020-06-30 |
JP2021503545A (ja) | 2021-02-12 |
BR112020008649A2 (pt) | 2020-10-27 |
US11702717B2 (en) | 2023-07-18 |
EP3704280B1 (fr) | 2022-04-13 |
CN111902551A (zh) | 2020-11-06 |
BR112020008649B1 (pt) | 2023-01-10 |
EP3704280A1 (fr) | 2020-09-09 |
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