WO2004005565A1 - 高強度低熱膨張鋳物鋼 - Google Patents
高強度低熱膨張鋳物鋼 Download PDFInfo
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- WO2004005565A1 WO2004005565A1 PCT/JP2002/006883 JP0206883W WO2004005565A1 WO 2004005565 A1 WO2004005565 A1 WO 2004005565A1 JP 0206883 W JP0206883 W JP 0206883W WO 2004005565 A1 WO2004005565 A1 WO 2004005565A1
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- ring
- thermal expansion
- strength
- low
- steel
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Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/021—Aluminium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/02—Light metals
- F05C2201/028—Magnesium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0403—Refractory metals, e.g. V, W
- F05C2201/0406—Chromium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0436—Iron
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0448—Steel
- F05C2201/0451—Cast steel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2201/00—Metals
- F05C2201/04—Heavy metals
- F05C2201/0433—Iron group; Ferrous alloys, e.g. steel
- F05C2201/0466—Nickel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
- F05C2251/00—Material properties
- F05C2251/04—Thermal properties
Definitions
- the present invention relates to a high Ni-containing low thermal expansion steel having good high-temperature strength and oxidation resistance, and to a blade ring and a seal ring retaining ring of a gas turbine made of such high-strength low thermal expansion green steel. It concerns ring-shaped parts. Direct view technology
- Ring-shaped components for gas turbine blade rings or seal ring retaining rings are known as applications requiring high strength and low thermal expansion characteristics at high temperatures.
- high strength and low thermal expansion characteristics have been required for ring-shaped parts for blade rings of gas bottles even at high temperatures, and materials used in such applications include SCP H 2 1 (1.2 Cr-0.5 Mo steel), SCPH32 (2.2 Cr-1. OM o ⁇ steel) or SCSI (13 Cr steel) was there.
- invar alloys usually emphasize the average thermal expansion coefficient in a relatively low temperature range from normal temperature to about 200 ° C. 0
- Zhang properties are certainly excellent.
- a heater is heated to a high temperature of about 500 ° C during use, such as a wing-shaped part of a gas bottle or a ring-shaped part for a seal ring holding ring
- inverter is required.
- Alloy alloys are not suitable because the clearance between the blade and the blade ring and the clearance between the seal fin and the seal ring retaining ring greatly change due to a rapid increase in the coefficient of thermal expansion.
- the ring alloy is used for the ring-shaped parts for the blade ring of the gas bottle and the seal ring holding ring ', which are applications that require both low coefficient of thermal expansion and high strength. Can not be used.
- the coefficient of thermal expansion from 00 ° C to 500 ° C is low and the strength at room temperature is very high.
- this alloy material can certainly exhibit low thermal expansion characteristics in a temperature range as low as 300 ° C, it can be used as a ring for a gas ring or a ring for holding a seal ring.
- the Cr resistance is as low as 1.0%, so the oxidation resistance and high-temperature strength at about 500 ° C are not sufficient.
- Ni is ⁇
- the alloy described in Japanese Patent Application Laid-Open No. 63-65055 contains Ni of 29 to 33% and Co of 4.5 to 6.5%. Since the amount of i is low, the average coefficient of thermal expansion up to a high temperature of about 500 ° C. increases, which is insufficient. Furthermore, in order to improve machinability with emphasis on machining accuracy, a large amount of spherical graphite is precipitated by adding 1.0 to 2.7% of C. On the other hand, not only does the strength decrease, but the addition of a large amount of C increases the coefficient of thermal expansion up to high temperatures (500 ° C). Disclosure of the invention
- An object of the present invention is to provide a low average thermal expansion coefficient in a temperature range from 20 ° C. to 500 ° C. required for a ring-shaped part for a blade ring of a gas turbine and a seal ring retaining ring, and an approximately 50 ° C.
- An object of the present invention is to provide a steel material having high strength at 0 ° C and good oxidation resistance, which is suitable for a ring-shaped part for a blade ring of a gas bottle and a ring for retaining a sealing ring. .
- the present inventors made various alloy elements.
- the present invention provides, in terms of mass% based on the mass of the alloy, 0.1 to 0.8% of C; 0.1 to L; 0.0% of Si; 0.0 1 to 0.1% S, more than 40% and less than 50% Ni, less than 4% (including 0%) Co, more than 1.5% and less than 4% Cr, 0.0: High-strength, low-thermal-expansion natural steel containing 0.1 to 0.1% of Al, 0.01 to 0.1% of Mg, and the balance being substantially Fe It is.
- This high-strength low-thermal-expansion natural steel preferably has an average coefficient of thermal expansion from 20 ° C. to 500 ° C. of 10.5 ⁇ 10 6 Z ° C. or less.
- the above-mentioned high-strength low-thermal-expansion natural steel preferably has a 0.2% proof stress of not less than 12 OMPa at 500 ° C., and further has a resistance of 100 hours at 500 ° C.
- the weight gain of oxidation after heating is 10 g / cm 2 or less.
- the above-mentioned high-strength low-thermal-expansion natural steel can also be used as a ring-shaped part for a blade of a gas bottle and a seal ring holding ring.
- the most significant feature of the present invention is that it exhibits excellent low thermal expansion characteristics even in a high temperature range up to 500 ° C, and has a low thermal expansion coefficient and excellent strength even at a temperature of about 500 ° C.
- chemical composition Hereinafter, each element specified in the present invention and its range will be described. In the present invention, unless otherwise specified, the content of each element is expressed as mass% based on the alloy.
- C has the effect of increasing the strength of the alloy by forming a solid solution in the matrix of the alloy. If it is less than 0.1%, the effect of increasing the strength is insufficient, and if it exceeds 0.8%, not only does the thermal expansion coefficient of the alloyed steel increase, but also the strength increases due to increased precipitation of graphite. descend. For this reason, the content of C is preferably 0.1 to 0.8%.
- Mn like Si
- the content of Mn is preferably 0.1 to 1.0%.
- Ni is the most important element for adjusting the coefficient of thermal expansion in the present invention. As the Ni content increases, the oxidation resistance of the alloy improves. On the other hand, when Ni is 40% or less, the magnetic transformation point is low, and the average thermal expansion coefficient from 20 ° C to 5 ° 0 ° C becomes too high. For this reason, Ni content of 40% or less is required for applications requiring low thermal expansion characteristics up to 500 ° C, such as ring-shaped parts for blade rings and seal ring retaining rings of gas bottles. When steel is used, the clearance between the blade and the blade ring and between the seal fin and the seal ring retaining ring changes significantly, deteriorating the performance.
- the Ni content exceeds 50% for applications requiring low thermal expansion characteristics up to 500 ° C, such as ring-shaped parts for blades of gas bottles and seal rings for retaining rings.
- the Ni content is preferably set to more than 40% and 50% or less.
- Ni is an amount near the upper limit of the content specified in the present invention. If Co is further added, the thermal expansion coefficient may be increased and the clearance may be deteriorated. It may be free (0%).
- the content of Cr is preferably more than 1.5% and 4% or less.
- Mg is added for the purpose of inoculating graphite, it also has an effect of suppressing strength reduction together with S and A 1.
- Mg is used alone or in combination with S to form MgS and becomes a nucleus when spheroidal graphite is precipitated, and is very effective in suppressing the grain boundary preferential precipitation of graphite, which causes a significant decrease in strength. To be there, at least 0.001% is needed. However, if the content exceeds 0.1%, MgO-based inclusions are formed in large amounts, causing structural defects, which may impair the mirror structure. Therefore, the content of Mg is preferably set to 0.001 to 0.1%.
- A1 is added for the purpose of deoxidation, it has an effect of suppressing the decrease in strength together with S and Mg. If the content of A 1 is less than 0.01%, the deoxidizing effect is insufficient, and Mg, which plays a role of nucleus of spheroidal graphite, binds to 0 and inhibits the inoculation effect of graphite. Not only that, it promotes the precipitation of graphite at the grain boundaries, greatly reducing the room-temperature and high-temperature strength of the alloy. However, when the content of A1 exceeds 0.1%, inclusions are formed in a large amount, and a large number of structural defects are generated, which is not preferable. Therefore, the content of A1 is preferably set to 0.01 to 0.1%.
- 2 0 ° average thermal expansion coefficient C from definitive in 5 0 0 ° C is 1 0. 5 x 1 0- 6 / ° C or less, 5 0 0 ° C It is preferable to have a performance of a 0.2% proof stress of 120 MPa or more and an oxidation weight increase of 100 g / m 2 or less after heating at 500 ° C. for 100 hours.
- a performance of a 0.2% proof stress of 120 MPa or more and an oxidation weight increase of 100 g / m 2 or less after heating at 500 ° C. for 100 hours will be described.
- the high-strength low-thermal-expansion high-strength steel of the present invention can be used in applications such as rim-shaped parts for gas turbine blade rings and seal ring retaining rings used in a high temperature region of about 500 ° C. It is desired to suppress the thermal expansion characteristics sufficiently low.
- the above-mentioned ring-shaped parts for the wings of gas bottles and the seal ring holding ring are mainly those with an operating temperature of 200 ° C or less, withstand up to 350 ° C, There are three types that can be used up to 500 ° C and three types. In this case, it is required that the clearance between the blade and the blade ring and between the seal fin and the seal ring holding ring be kept almost constant at any operating temperature range. It is desirable that the clearance between the blade and the ring of the gas bin and between the seal fin and the holding of the sealing be small.
- the average coefficient of thermal expansion from 20 ° C to 500 ° C at high temperature is 10.5 X 10 _ 6 Z ° C or less. because it can satisfy determined, in the present invention, 2 0 ° 1 0 the average thermal expansion coefficients from C to 5 0 0 ° C. 5 X 1 0 _ 6 Z ° C or less is that the configuration preferred.
- the average thermal expansion coefficient definitive from 2 0 ° C to 5 0 0 ° C is 1 0. 5 X 1 0- 6 / ° C or lower thermal expansion characteristics is long been achieved
- such an alloy can be sufficiently used for a ring-shaped part for a gas turbine blade ring and a seal ring holder used at 200 ° C. or 350 ° C.
- the high-strength low-thermal-expansion natural steel of the present invention is used in a high-temperature region of about 500 ° C. It is expected that sufficiently high strength will be exhibited in applications such as ring-shaped parts for blade rings and seal ring retaining rings of gas bottles used for u. For example, the above-mentioned ring-shaped parts for the wing of the gas bottle and the ring for holding the seal ring are likely to undergo plastic deformation or creep deformation when the temperature rises to 500 ° C. Higher strength (proof strength) is required because the clearance changes when held at a high temperature and there is a risk of contact. Therefore, in the present invention, the 0.2% resistance at 500 ° C. is set to 120 MPa or more.
- the high-strength low-thermal-expansion ferritic steel of the present invention is used in ring-shaped parts for blade rings and seal ring retaining rings of gas bottles used in a high temperature range of about 500 ° C.
- a particularly desirable property is that the oxidation weight gain is small.
- the high-strength low-thermal-expansion natural steel of the present invention when used for the ring-shaped parts for the blade ring of the gas bottle and the seal ring holding ring, when heated and held at 500 ° C, the surface becomes Oxidation scale is formed, but the oxide scale at that time is required to be stable, dense and difficult to peel off. ⁇ A large amount of oxide scale is formed during heating at 500 ° C, and it is easy to peel off. If separation occurs, the gaps formed between the blade and the blade ring and between the seal fin and the sealing ring are increased, which is not preferable.
- the present inventors consider that the oxidation weight increase after performing an oxidation resistance test at 500 ° C. for 100 hours is 10 g / m 2 or less. , The oxidation resistance of the alloy is sufficient and the problem of gaps between the blade and the blade ring and between the seal fin and the sealing ring can be suppressed. It was defined that the increase in oxidation after heating for 100 hours was preferably 100 g / m 2 or less.
- the high-strength low-thermal-expansion natural steel of the present invention exhibits excellent low-thermal-expansion characteristics even in a high-temperature region up to 500 ° C., and further exhibits excellent properties at a temperature of about 500 ° C. Shows the strength. Therefore, the high-strength low-thermal-expansion natural steel of the present invention is used as a ring for a gas turbine blade and a seal ring retaining ring. ⁇
- the ring-shaped parts for the blade ring of the gas bottle and the seal ring holding ring have been described as particularly desirable applications of the high-strength low-thermal-expansion natural steel of the present invention. It can also be used for other applications that require a low thermal expansion of up to 500 ° C and a high strength in a high temperature range of about 500 ° C.
- each of the alloyed copper alloys No. 1 to 8 of the present invention, the comparative alloyed steel alloys No. 11 to 15, and the conventional alloyed steel alloys No. 21 and 22 were each melted by a weight of 10 kg, and then each The molten metal was poured into a 100 mmx100 mmx100 mm x 100 mm sandstone mold, and solidified and cooled in the mold.
- Table 1 shows the chemical composition.
- the prepared comparative alloy high-strength steel N 0.11 is an alloy in which Ni is lower than that of the alloy of the present invention and Cr is not added.
- No. 12 has a lower Ni than that of the alloyed steel according to the present invention.
- N 0.14 is one in which Cr is not added as compared with the alloyed steel of the present invention.
- No. 15 has a higher Ni than that of the alloyed steel according to the present invention.
- A1 and Mg were lower than those of the alloyed steel according to the invention.
- the conventional alloy steel No. 21 was equivalent to SCSI, and No. 22 was equivalent to SCPH21.
- Specimen material was collected from the forged alloy steel.
- the alloyed steels of the present invention and the comparative alloyed steels after holding at 700 ° C for 3 hours, an air-cooled heat treatment was performed, and the SCS1 equivalent alloy of No. 21 of the conventional alloyed steels was used. After holding at 980 ° C. for 1 hour, an oil-cooled quenching treatment and an air-cooled tempering treatment after holding at 700 ° C. for 2 o'clock were performed. Also] ⁇ 0.22 2 3 ⁇ ? 112 1 Equivalent alloy steels were held at 950 ° C for 1 hour, oil-cooled quenching, and held at 700 ° C for 2 hours, air-cooled tempering, and tested. The material was made.
- the average coefficient of thermal expansion was measured using a test piece having a diameter of 5 mm and a length of 20 mm using a differential thermal expansion measuring apparatus, and the average coefficient of thermal expansion from 20 ° C to each temperature was determined.
- the 500 ° C. tensile test was performed by preparing a test piece having a parallel portion length of 25.4 mm and a parallel portion diameter of 6.35 mm in accordance with the ASTM standard.
- oxidation resistance test a test piece of 1 mm in diameter x 15 mm in length was heated at 350 ° C and 500 ° C in air for 100 hours, and the weight of the test piece before and after the test was measured. From the difference between the changes, the weight change (oxidation increase) per unit surface area was determined.
- Table 2 shows the average coefficient of thermal expansion from 20 ° C to each temperature, the results of the oxidation resistance test at 350 ° C and 500 ° C, and the results of the 500 ° C tensile test.
- the average thermal expansion coefficient of the comparative alloy is as follows: alloy N0.12, whose content of Ni is smaller than the range of the present invention, or N0.15, which is large, has an average thermal expansion coefficient of 10. It is a high value exceeding 5 ⁇ 10 16 / ° C, and it can be seen that the thermal expansion coefficient increases when the Ni amount is too large or too low.
- N o 2 1 (SCSI or equivalent) and N o 2 2 (S CP H 2 1 equivalent), it it 1 1.9 1 0 -.. 6 Roh ° € ;, 1 3. 6 X 1 0 - shows a 6 7 ° C and high values.
- the strength of the alloy steel of the present invention at 500 ° C. (0.2% resistance) controls the addition of C and Cr for improving the strength and the control of A 1 -Mg and S for suppressing the reduction in strength. All of the above additions show values of 120 MPa or more, which is good.
- Netsu ⁇ Zhang properties 1 0. 5 X 1 0- 6 / ° a C following favorable characteristics N o. 1 1, N 0. 1 3 and N o. 1 No. 4 has a low high temperature proof stress. The reason why the high temperature proof stress of N 0.11 and N 0.14 is low is that Cr is not added.
- the strength of the alloyed steel No. 13 is remarkably poor.
- the oxidation resistance of the alloyed steel according to the present invention at 500 ° C. is extremely low at 10 g / m 2 or less because Ni and Cr, which are effective for oxidation resistance, may be sufficiently added. Shows good values.
- the comparative alloy is 500.
- the oxidation resistance of C is such that the addition of Ni and Cr is insufficient. o.11 indicates an increase of l O gZm 2 or more.
- No. 21 (SCSI) a conventional alloyed steel, contains 12.5% of Cr, and although it has satisfactory oxidation resistance, No. 22 (SCPH 2 In 1), the content of elements such as Cr contributing to oxidation resistance is small, so that the amount of oxidation increase is large.
- the high-strength low-thermal-expansion hard steel which is the alloy hard steel of the present invention has an average coefficient of thermal expansion at 20 ° C. to 500 ° C. lower than that of the martensitic heat-resistant hard steel, and is 50% lower. High temperature strength at 0 ° C and oxidation resistance are also good.
- the alloy steel of the present invention has a low thermal expansion up to 500 ° C. and has excellent strength even in a high temperature range of about 500 ° C. Ideal for ring-shaped parts for rings and seal rings.
- the alloy of the present invention appropriate amounts of Ni and C0 are included for realizing low thermal expansion characteristics, and appropriate amounts of C and Cr are included for enhancing high-temperature strength at a temperature of about 500 ° C. Further, by adding an element such as S, Mg, or A1 in an appropriate amount, a decrease in strength can be suppressed. As a result, the alloy of the present invention can achieve both the favorable characteristics of high high-temperature strength at 500 ° C. and low thermal expansion from 20 ° C. to 500 ° C. It is most suitable for use in ring-shaped parts for wing rings and seal ring retaining rings.
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Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001000304A JP4768919B2 (ja) | 2001-01-05 | 2001-01-05 | 高強度低熱膨張鋳物鋼及び高強度低熱膨張鋳物鋼からなるガスタービンの翼環用及びシールリング保持環用リング形状部品 |
DE60214909T DE60214909T2 (de) | 2002-07-08 | 2002-07-08 | Stahlguss mit hoher festigkeit und geringer wärmeausdehnung |
CNB028053451A CN1243119C (zh) | 2001-01-05 | 2002-07-08 | 高强度、低热膨胀的铸钢 |
PCT/JP2002/006883 WO2004005565A1 (ja) | 2001-01-05 | 2002-07-08 | 高強度低熱膨張鋳物鋼 |
EP02741429A EP1589123B1 (en) | 2002-07-08 | 2002-07-08 | Casting steel having high strength and low thermal expansion |
CA002458508A CA2458508C (en) | 2002-07-08 | 2002-07-08 | High-strength and low-thermal expansion cast steel |
US10/485,812 US6846368B2 (en) | 2001-01-05 | 2002-07-08 | Casting steel having high strength and low thermal expansion |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001000304A JP4768919B2 (ja) | 2001-01-05 | 2001-01-05 | 高強度低熱膨張鋳物鋼及び高強度低熱膨張鋳物鋼からなるガスタービンの翼環用及びシールリング保持環用リング形状部品 |
PCT/JP2002/006883 WO2004005565A1 (ja) | 2001-01-05 | 2002-07-08 | 高強度低熱膨張鋳物鋼 |
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WO2004005565A1 true WO2004005565A1 (ja) | 2004-01-15 |
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PCT/JP2002/006883 WO2004005565A1 (ja) | 2001-01-05 | 2002-07-08 | 高強度低熱膨張鋳物鋼 |
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EP (1) | EP1589123B1 (ja) |
CA (1) | CA2458508C (ja) |
DE (1) | DE60214909T2 (ja) |
WO (1) | WO2004005565A1 (ja) |
Cited By (1)
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EP1997921A2 (de) * | 2007-06-01 | 2008-12-03 | Mahle International GmbH | Dichtring |
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RU2755784C1 (ru) * | 2020-12-02 | 2021-09-21 | Общество с ограниченной ответственностью Научно-производственный центр «ЛИНВАР» | Литейный инварный сплав на основе железа |
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JPS6267201A (ja) * | 1985-09-18 | 1987-03-26 | Kyocera Corp | セラミツクタ−ボロ−タ |
JPH08100242A (ja) * | 1994-09-30 | 1996-04-16 | Hitachi Metals Ltd | 高強度高靭性低熱膨張合金線およびその製造方法 |
US6142731A (en) * | 1997-07-21 | 2000-11-07 | Caterpillar Inc. | Low thermal expansion seal ring support |
JP2002206143A (ja) * | 2001-01-05 | 2002-07-26 | Hitachi Metals Ltd | 高強度低熱膨張鋳物鋼及び高強度低熱膨張鋳物鋼からなるガスタービンの翼環用及びシールリング保持環用リング形状部品 |
Family Cites Families (4)
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JP2594441B2 (ja) * | 1987-07-16 | 1997-03-26 | 日本鋳造株式会社 | 快削性高温低熱膨張鋳造合金の製造方法 |
JP2968430B2 (ja) * | 1994-02-17 | 1999-10-25 | 山陽特殊製鋼株式会社 | 高強度低熱膨張合金 |
TW389794B (en) * | 1995-01-23 | 2000-05-11 | Daido Steel Co Ltd | High strength, low thermal expansion alloy wire and method of making the wire |
JP3381845B2 (ja) * | 1999-07-08 | 2003-03-04 | 日立金属株式会社 | 被削性に優れた低熱膨張鋳鋼 |
-
2002
- 2002-07-08 EP EP02741429A patent/EP1589123B1/en not_active Expired - Lifetime
- 2002-07-08 DE DE60214909T patent/DE60214909T2/de not_active Expired - Lifetime
- 2002-07-08 CA CA002458508A patent/CA2458508C/en not_active Expired - Fee Related
- 2002-07-08 WO PCT/JP2002/006883 patent/WO2004005565A1/ja active IP Right Grant
Patent Citations (4)
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JPS6267201A (ja) * | 1985-09-18 | 1987-03-26 | Kyocera Corp | セラミツクタ−ボロ−タ |
JPH08100242A (ja) * | 1994-09-30 | 1996-04-16 | Hitachi Metals Ltd | 高強度高靭性低熱膨張合金線およびその製造方法 |
US6142731A (en) * | 1997-07-21 | 2000-11-07 | Caterpillar Inc. | Low thermal expansion seal ring support |
JP2002206143A (ja) * | 2001-01-05 | 2002-07-26 | Hitachi Metals Ltd | 高強度低熱膨張鋳物鋼及び高強度低熱膨張鋳物鋼からなるガスタービンの翼環用及びシールリング保持環用リング形状部品 |
Non-Patent Citations (1)
Title |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1997921A2 (de) * | 2007-06-01 | 2008-12-03 | Mahle International GmbH | Dichtring |
EP1997921A3 (de) * | 2007-06-01 | 2009-10-28 | Mahle International GmbH | Dichtring |
Also Published As
Publication number | Publication date |
---|---|
DE60214909T2 (de) | 2007-09-06 |
EP1589123A1 (en) | 2005-10-26 |
CA2458508A1 (en) | 2004-01-15 |
EP1589123A4 (en) | 2005-11-30 |
EP1589123B1 (en) | 2006-09-20 |
DE60214909D1 (de) | 2006-11-02 |
CA2458508C (en) | 2007-09-18 |
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