WO2022210793A1 - 鉄鋳物 - Google Patents
鉄鋳物 Download PDFInfo
- Publication number
- WO2022210793A1 WO2022210793A1 PCT/JP2022/015705 JP2022015705W WO2022210793A1 WO 2022210793 A1 WO2022210793 A1 WO 2022210793A1 JP 2022015705 W JP2022015705 W JP 2022015705W WO 2022210793 A1 WO2022210793 A1 WO 2022210793A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- heat treatment
- mass
- casting
- heat
- examples
- Prior art date
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 197
- 238000005266 casting Methods 0.000 title claims abstract description 136
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 91
- 238000010438 heat treatment Methods 0.000 claims abstract description 134
- 239000000463 material Substances 0.000 claims abstract description 89
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 29
- 239000012071 phase Substances 0.000 description 49
- 239000010955 niobium Substances 0.000 description 42
- 239000011651 chromium Substances 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 28
- 239000010936 titanium Substances 0.000 description 27
- 239000013078 crystal Substances 0.000 description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 25
- 239000011572 manganese Substances 0.000 description 20
- 238000001556 precipitation Methods 0.000 description 19
- 238000005204 segregation Methods 0.000 description 16
- 239000010949 copper Substances 0.000 description 14
- 229910052799 carbon Inorganic materials 0.000 description 12
- 238000001816 cooling Methods 0.000 description 12
- 239000000203 mixture Substances 0.000 description 12
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 11
- 229910052804 chromium Inorganic materials 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910001566 austenite Inorganic materials 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 8
- 239000006104 solid solution Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 150000002505 iron Chemical class 0.000 description 3
- 150000004767 nitrides Chemical class 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000001226 reprecipitation Methods 0.000 description 2
- 238000007528 sand casting Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000004993 emission spectroscopy Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000005495 investment casting Methods 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005486 sulfidation Methods 0.000 description 1
- 150000004763 sulfides Chemical class 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
-
- 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
-
- 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
-
- 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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
Definitions
- the present invention relates to an iron casting manufactured using a ferritic casting material.
- Patent Document 1 describes providing a heat-resistant cast steel with excellent thermal fatigue resistance. Further, in the abstract of Patent Document 1, the contents of C, Si, Mn, P, S and Cr are respectively 0.10 wt% ⁇ C ⁇ 0.30 wt%, 2.0 wt% ⁇ Si ⁇ 4 0% by weight, 0.3% by weight ⁇ Mn ⁇ 1.0% by weight, P ⁇ 0.04% by weight, S ⁇ 0.30% by weight, 5.0% by weight ⁇ Cr ⁇ 15.0% by weight , and the balance is substantially Fe, and the cast structure of the matrix is a mixed phase structure consisting of ferrite phase and pearlite phase, thereby extending the thermal fatigue life of the heat-resistant cast steel and improving the room temperature elongation. It is described that the thermal fatigue resistance can be improved by
- One aspect of the present invention is an iron casting obtained by performing a first heat treatment on a heat-treated object cast using a ferritic casting material.
- the casting material contains 0.0001-0.03 wt% C, 0.001-0.6 wt% Ni, 16.0-21.0 wt% Cr, the balance being Fe and It is an unavoidable element.
- Performing the first heat treatment includes holding the heat-treated object in a first temperature range of 750 to 1380.degree.
- the heat treatment target The ferrite phase is crystallized as the main phase in the material. Furthermore, when the liquid phase solidifies in the process of crystallization of the ferrite phase, the solute element dissolved in a non-uniform concentration distribution inside the crystal grain that constitutes the ferrite phase (hereinafter referred to as "inside the crystal grain") By performing the first heat treatment at a temperature of 750 to 1380° C. and maintaining the temperature in the first temperature range of 750 to 1380° C., the solute element is dissolved in the crystal grains with high uniformity.
- holding the heat-treated object in the first temperature range includes holding the heat-treated object for a first time range of 0.5 to 6.0 hours.
- the iron casting is preferably obtained by subjecting the heat-treated object to the second heat treatment after the first heat treatment.
- performing the second heat treatment includes holding the heat-treated object at a second temperature range of 20 to 1080°C.
- a second heat treatment is performed on the solute elements distributed in the grains of the ferrite phase or at the boundaries of the grains (hereinafter referred to as "grain boundaries"), and held at a second temperature range of 20 to 1080 ° C. controls the segregation of solute elements in grains or grain boundaries.
- grain boundaries the solute elements distributed in the grains of the ferrite phase or at the boundaries of the grains (hereinafter referred to as "grain boundaries")
- grain boundaries the solute elements distributed in the grains of the ferrite phase or at the boundaries of the grains
- holding the heat-treated object in the second temperature range includes holding the heat-treated object for a second time range of 0.3 to 48 hours.
- the casting material preferably further contains 0.0001 to 0.03% by mass of N.
- the content of N in the casting material 0.0001 to 0.03% by mass, the amount of solidified segregation of N is reduced, and a small amount of N solidified and segregated in the crystal grains is treated by the first method.
- the heat treatment can reliably reduce the segregation of N in the crystal grains.
- the casting material preferably further contains 0.001 to 1.0% by mass of Mn. Precipitation of the austenite phase can be suppressed by setting the Mn content in the casting material to 0.001 to 1.0% by mass. Therefore, it is easy to stabilize the ferrite phase from the normal temperature range to the high temperature range, and it is easy to suppress the phase transformation that accompanies the first heat treatment. Therefore, a decrease in ductility due to phase transformation can be suppressed.
- the casting material preferably further contains 0.1-0.3% by mass of Ti.
- the Ti content in the casting material 0.1 to 0.3% by mass, it is possible to refine the crystal grains and increase the proportion of crystal grain boundaries in the ferrite phase. Therefore, it is easy to reduce the segregation concentration of the solute element at the grain boundary. Therefore, it is easy to improve the elongation of iron castings.
- Another aspect of the present invention is an iron casting obtained by subjecting a heat-treated object cast using a ferritic casting material to a first heat treatment, wherein the first heat treatment includes: An iron casting comprising holding a heat treated object in a first temperature range of 750-1380°C.
- the iron casting is preferably obtained by subjecting the heat-treated object to the second heat treatment after the first heat treatment.
- performing the second heat treatment includes holding the heat-treated object at a second temperature range of 20 to 1080°C.
- FIG. 1 is a diagram showing the compositions of the first embodiment (Examples 1-7) and the second embodiment (Example 8), and the compositions of Comparative Examples 1-2.
- FIG. 2 shows the heat treatment conditions and mechanical properties of the first embodiment (Examples 1 to 7) and the second embodiment (Example 8), and the heat treatment conditions and mechanical properties of Comparative Examples 1 and 2.
- FIG. 4 is a diagram showing; FIG. 3A shows the compositions of the third embodiment (Examples 9-43).
- FIG. 3B shows the compositions of the third embodiment (Examples 44-77).
- FIG. 3C is a diagram showing the compositions of the fourth embodiment (Examples 78-105) and the compositions of Comparative Examples 3-5.
- FIG. 4A is a diagram showing the heat treatment conditions and mechanical properties of the third embodiment (Examples 9-43).
- FIG. 4B is a diagram showing the heat treatment conditions and mechanical properties of the third embodiment (Examples 44-77).
- FIG. 4C is a diagram showing the heat treatment conditions and mechanical properties of the fourth embodiment (Examples 78-105) and the heat treatment conditions and mechanical properties of Comparative Examples 3-5.
- the material used to manufacture the iron casting according to the embodiment of the present invention is a ferritic casting material.
- “Ferritic casting material” means a casting material having a ferrite phase as a main phase.
- the ferrite phase accounts for 50% or more of the entire structure.
- the ratio of the ferrite phase in the entire structure is preferably 70% or more, more preferably 80% or more, more preferably 85% or more, more preferably 90% or more, 92 It is more preferably 0.5% or more, more preferably 95% or more, more preferably 97.5% or more, even more preferably 99% or more.
- casting includes casting by various casting methods such as sand casting, metal mold casting, die casting, and lost wax casting.
- % by mass of an element means the percentage of the mass of the element with respect to the mass of the ferritic casting material.
- the notation “X to Y mass % of an element” means that the mass % of the element is X % or more and Y % or less.
- the "remainder” means the components other than the listed elements among the components constituting the ferritic casting material. Therefore, for example, the notation "including . . . C, . . . Ni, and . , means that components other than Ni and Cr are Fe and inevitable elements.
- the notation "X to Y ° C.” in the heat treatment conditions means that the holding temperature is X ° C. or more and Y ° C. or less
- the notation "X to Y hours” means that the holding time is X hours or more and Y hours or less.
- a first form of a ferritic casting material (hereinafter referred to as "this material") contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 0.03% by mass of Si.
- this material contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 0.03% by mass of Si.
- a first form of the material contains 0.0001 to 0.03 wt% C.
- C carbon
- a first form of the present material contains 0.0001 to 0.03 wt% C.
- C is fixed together with N as Nb carbonitrides, thereby reducing the formation of Cr carbonitrides. be able to. Therefore, it is possible to suppress the decrease in the Cr content in the ferrite phase. Therefore, deterioration of the corrosion resistance of iron castings can be suppressed.
- the upper limit of the C content to 0.03% by mass, it is possible to suppress the precipitation of the austenite phase in the high temperature range.
- the upper limit of the C content is preferably 0.02% by mass. Precipitation of Cr carbonitrides and Nb carbonitrides can be further suppressed. Therefore, deterioration in corrosion resistance and embrittlement of iron castings can be further suppressed. The same applies to the following forms of the present material.
- Si silicon
- a first form of this material contains 0.001 to 1.0% Si by weight.
- the upper limit of the Si content is set to 1.0% by mass, it is possible to suppress an increase in the solid solution amount of Si in the ferrite phase. Therefore, it is possible to suppress the decrease in ductility of the iron casting and the occurrence of weld cracks.
- the upper limit of the Si content is set to 1.0% by mass, aggregation of non-metallic inclusions (oxides) such as silicon dioxide can be suppressed. Therefore, it is possible to suppress the occurrence of surface defects and internal defects in iron castings.
- the lower limit of the Si content is preferably 0.4% by mass.
- Non-metallic inclusions such as silicon dioxide can act as precipitation nuclei for Nb carbonitride. Therefore, aggregation of Nb carbonitrides is suppressed, and the Nb carbonitrides are easily dispersed uniformly in the crystal grains. Therefore, by suppressing excessive growth of Nb carbonitrides in crystal grains, brittle fracture of iron castings can be suppressed.
- the upper limit of the Si content is preferably 0.6% by mass.
- the Nb carbonitrides can be more uniformly dispersed in the crystal grains, and excessive growth of the Nb carbonitrides can be further suppressed. The same applies to the following forms of the present material.
- a first form of this material contains 0.001 to 1.0% by weight Mn.
- precipitation of the austenite phase can be suppressed by setting the upper limit of the content of Mn, which is an austenitizing element, to 1.0% by mass. Therefore, the ferrite phase can be stabilized over the normal temperature range to the high temperature range.
- the upper limit of the Mn content is set to 1.0% by mass, excessive generation of non-metallic inclusions (sulfides) such as manganese sulfide formed by Mn, which tends to segregate in the final solidified portion, together with S is suppressed. can do.
- the upper limit of the Mn content is preferably 0.2% by mass, more preferably 0.15% by mass. It is possible to reduce the amount of non-metallic inclusions such as manganese sulfide that precipitate at grain boundaries. Therefore, non-metallic inclusions such as silicon dioxide tend to act preferentially as precipitation nuclei for Nb carbonitrides, and Nb carbonitrides tend to be uniformly dispersed in crystal grains. The same applies to the following forms of the present material.
- a first form of this material contains 0.0001 to 0.04% by weight P.
- P Phosphorus
- a first form of this material contains 0.0001 to 0.04% by weight P.
- the upper limit of the P content is preferably 0.03% by mass. Embrittlement of iron castings can be further suppressed. The same applies to the following forms of the present material.
- a first form of this material contains 0.0001 to 0.027% by weight S.
- S sulfur
- a first form of this material contains 0.0001 to 0.027% by weight S.
- non-metallic inclusions such as manganese sulfide (sulfidation substance) can be suppressed. For this reason, it is possible to suppress excessive precipitation of Nb carbonitrides in grains or grain boundaries using nonmetallic inclusions such as manganese sulfide as precipitation nuclei. Therefore, it is possible to suppress the occurrence of intergranular embrittlement caused by Nb carbonitrides precipitated at grain boundaries.
- the upper limit of the S content is preferably 0.025% by mass, more preferably 0.020% by mass, and even more preferably 0.015% by mass.
- the lower limit of the S content is preferably 0.001% by mass, more preferably 0.004% by mass. It is possible to reduce the amount of non-metallic inclusions such as manganese sulfide that precipitate at grain boundaries. The same applies to the following forms of the present material.
- a first form of this material contains 0.3 to 0.8% Cu by weight.
- the corrosion resistance of iron castings can be improved by setting the Cu content to 0.3 to 0.8% by mass.
- the lower limit of the Cu content is preferably 0.4% by mass.
- a decrease in the corrosion resistance of iron castings can be suppressed.
- the upper limit of the Cu content is preferably 0.5% by mass. Precipitation of Cu can be suppressed, and a decrease in ductility of iron castings can be suppressed. The same applies to the following forms of the present material.
- Ni nickel
- a first form of this material contains 0.001 to 0.6 wt% Ni.
- precipitation of the austenite phase can be suppressed by setting the upper limit of the content of Ni, which is an austenitizing element, to 0.6% by mass. Therefore, the ferrite phase can be stabilized over the normal temperature range to the high temperature range.
- the upper limit of the Ni content is preferably 0.4% by mass, more preferably 0.3% by mass. It is possible to improve the corrosion resistance of iron castings while suppressing an increase in alloy costs. The same applies to the following forms of the present material.
- a first form of this material contains 16.0-21.0% by weight Cr.
- the content of Cr which is a ferritizing element, is 16.0 to 21.0% by mass, so that the ferrite phase can be stabilized over the normal temperature range to the high temperature range.
- the lower limit of the Cr content is preferably 18.0% by mass.
- the corrosion resistance of iron castings can be further improved.
- the upper limit of the Cr content is preferably 19.0% by mass. It is possible to suppress the precipitation of embrittlement phases such as the ⁇ phase and suppress the decrease in ductility of iron castings. The same applies to the following forms of the present material.
- Nb niobium
- a first form of this material contains 0.3-0.8% by weight of Nb.
- Nb niobium
- the upper limit of the Nb content is preferably 0.6% by mass, more preferably 0.4% by mass. It is possible to suppress the deterioration of the ductility of iron castings due to excessive solid-solution strengthening and excessive generation of Nb carbonitrides, and also suppress the occurrence of weld cracks. The same applies to the following forms of the present material.
- N nitrogen
- a first form of this material contains 0.0001-0.03% by weight N.
- the formation of Cr carbonitrides formed by N together with C can be reduced. Therefore, it is possible to suppress the decrease in the Cr content in the ferrite phase. Therefore, deterioration of the corrosion resistance of iron castings can be suppressed.
- the upper limit of the N content to 0.03% by mass, it is possible to suppress the precipitation of the austenite phase in the high temperature range. Therefore, by reducing the ratio of the austenite phase, which tends to reduce the diffusion rate of Cr, it is possible to ensure the amount of Cr supplied to the oxide film of the iron casting.
- the corrosion resistance of iron castings can be improved.
- excessive production of Nb carbonitrides formed by N together with C can be suppressed. Therefore, excessive precipitation of Nb carbonitride in grains and grain boundaries can be suppressed. Therefore, it is possible to suppress the decrease in ductility of the iron casting and the occurrence of weld cracks.
- excessive generation of Nb carbonitrides can be suppressed, it is possible to suppress a decrease in the solid solution amount of Nb in the ferrite phase. Therefore, the high temperature strength of the iron casting can be improved.
- the upper limit of the N content is preferably 0.02% by mass. Precipitation of Cr carbonitrides and Nb carbonitrides can be further suppressed. Therefore, deterioration in corrosion resistance and embrittlement of iron castings can be further suppressed. The same applies to the following forms of the present material.
- the balance in the first form of this material is Fe and unavoidable elements.
- inevitable elements contained in the balance include Al (aluminum), Mo (molybdenum), V (vanadium), Co (cobalt), Sn (tin), Ce (cerium), Te (tellurium), and La (lanthanum). , Bi (bismuth), and Zn (zinc).
- the content of the inevitable elements is, for example, preferably 5.0% by mass or less in total, more preferably 3.0% by mass or less in total, and 1.0% by mass or less in total. More preferably, the total amount is 0.5% by mass or less, more preferably 0.2% by mass or less, and even more preferably 0.1% by mass or less. The same applies to the following forms of the present material.
- a second form of this material is 0.0001-0.03 wt% C, 0.001-1.0 wt% Si, 0.001-1.0 wt% Mn, and 0.001-1.0 wt% Si. 0001 to 0.04 wt% P, 0.0001 to 0.027 wt% S, 0.3 to 0.8 wt% Cu, 0.001 to 0.6 wt% Ni, 16.0-21.0 wt% Cr, 0.3-0.8 wt% Nb, 0.0001-0.03 wt% N, 0.1-0.3 wt% Ti and the balance is Fe and unavoidable elements.
- Ti titanium
- a second form of this material contains 0.1-0.3% Ti by weight.
- the Ti content By setting the Ti content to 0.1 to 0.3% by mass, it is possible to refine the crystal grains and increase the ratio of crystal grain boundaries in the ferrite phase. . Therefore, it is easy to reduce the segregation concentration of the solute element at the grain boundary. Therefore, it is easy to improve the elongation of iron castings.
- the lower limit of the Ti content By setting the lower limit of the Ti content to 0.1% by mass, it is possible to promote refinement of crystal grains.
- the upper limit of the Ti content By setting the upper limit of the Ti content to 0.3% by mass, it is possible to suppress the decrease in ductility of iron castings due to excessive solid-solution strengthening and excessive generation of Ti oxides, and to suppress the occurrence of weld cracks.
- the upper limit of the C content is set to 0.03% by mass
- the upper limit of the N content is set to 0.03% by mass
- the Ti content is set to 0.1 to 0.3% by mass.
- the present material is not limited to the form described above.
- the material contains one or more of the elements C, Si, Mn, P, S, Cu, Ni, Cr, Nb, N and Ti, and the balance is Fe and unavoidable elements. good.
- An example of another form of the material contains 0.0001-0.03 wt% C, 0.001-0.6 wt% Ni, and 16.0-21.0 wt% Cr. , the remainder being Fe and unavoidable elements.
- an example of another form of this material is 0.0001 to 0.03% by mass of C, 0.001 to 0.6% by mass of Ni, and 16.0 to 21.0% by mass of Cr. , 0.1 to 0.3% by mass of Ti, the balance being Fe and unavoidable elements.
- an example of another form of this material is 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Mn, and 0.001 to 0.6% by mass of Ni. , 16.0-21.0% by mass of Cr, 0.0001-0.03% by mass of N, and the balance being Fe and unavoidable elements.
- an example of another form of this material is 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Mn, and 0.001 to 0.6% by mass of Ni. , containing 16.0 to 21.0% by mass of Cr, 0.0001 to 0.03% by mass of N, and 0.1 to 0.3% by mass of Ti, the balance being Fe and unavoidable elements .
- a first form of heat treatment (hereinafter referred to as "main heat treatment") performed on a heat treatment object cast using the present material is a first heat treatment (solution treatment, primary heat treatment) on the heat treatment object. Including doing.
- Performing the first heat treatment includes holding the heat-treated object in a first temperature range of 750 to 1380.degree. Holding the first temperature range includes holding the heat-treated object for a first time range of 0.5 to 6.0 hours.
- a casting material with a Ni content of 0.001 to 0.6% by mass and a Cr content of 16.0 to 21.0% by mass is used before performing the first heat treatment.
- a ferrite phase is crystallized as a main phase in the heat-treated object by casting the heat-treated object.
- the solute element dissolved in the crystal grains constituting the ferrite phase with a non-uniform concentration distribution is Then, the first heat treatment is performed. Since performing the first heat treatment includes holding the heat treatment object in the first temperature range of 750 to 1380° C., the solute element can be solid-solved in the crystal grains with high uniformity. This can reduce the segregation of solute elements in the crystal grains. As a result, the elongation of iron castings can be improved. The same applies to the following modes of this heat treatment.
- the upper limit of the content of Ni, which is an austenitizing element, is set to 0.6% by mass
- the content of Cr, which is a ferritizing element is set to 16.0 to 21.0% by mass. Therefore, the ferrite phase can be stabilized from the normal temperature range to the high temperature range. Therefore, it is easy to suppress the phase transformation that accompanies the first heat treatment. Therefore, a decrease in ductility due to phase transformation can be suppressed. The same applies to the following modes of this heat treatment.
- a casting material having a C content of 0.0001 to 0.03% by mass and an N content of 0.0001 to 0.03% by mass before performing the first heat treatment can reduce the amount of solidification segregation of C and N in the heat treatment object.
- the first heat treatment is performed on C and N solidified and segregated in the crystal grains, albeit in very small amounts. Thereby, the segregation of C and N in the crystal grains can be reduced with high certainty. The same applies to the following modes of this heat treatment.
- the upper limit of the first temperature range is preferably 1350°C, more preferably 1300°C, more preferably 1250°C, more preferably 1200°C, and preferably 1150°C. More preferably, it is 1125°C even more preferably.
- the lower limit of the first temperature range is preferably 775°C, more preferably 800°C, more preferably 850°C, more preferably 900°C, and more preferably 950°C. It is more preferably 1000°C, more preferably 1050°C, even more preferably 1075°C. The same applies to the following modes of this heat treatment.
- the upper limit of the first time range is preferably 5.5 hours, more preferably 5.0 hours, more preferably 4.5 hours, more preferably 4.0 hours. Preferably, it is more preferably 3.5 hours.
- the lower limit of the first time range is preferably 1.0 hours, more preferably 1.5 hours, more preferably 2.0 hours, and further preferably 2.5 hours. preferable. The same applies to the following modes of this heat treatment.
- a second form of this heat treatment includes performing a second heat treatment (aging treatment, secondary heat treatment) on the heat treatment object after performing the first heat treatment.
- Performing the second heat treatment includes holding the heat-treated object at a second temperature range of 20 to 1080°C. Holding the second temperature range includes holding the heat treated object for a second time range of 0.3 to 48 hours.
- the second heat treatment is performed on the solute elements distributed within the crystal grains of the ferrite phase or at the grain boundaries. Since performing the second heat treatment includes holding at a second temperature range of 20 to 1080° C., the segregation state of solute elements within grains or at grain boundaries can be controlled. This makes it possible, for example, to reduce the segregation of the solute element or to change the segregation tendency of the solute element. As a result, the elongation of the iron casting can be further improved.
- the upper limit of the content of Ni, which is an austenitizing element, is set to 0.6% by mass
- the content of Cr, which is a ferritizing element is set to 16.0 to 21.0% by mass. Therefore, the ferrite phase can be stabilized from the normal temperature range to the high temperature range. Therefore, it is easy to suppress the phase transformation that accompanies the second heat treatment. Therefore, a decrease in ductility due to phase transformation can be suppressed.
- the upper limit of the C content is set to 0.03% by mass.
- an increase in the reprecipitation amount of Nb carbonitrides accompanying the second heat treatment can be suppressed.
- excessive reprecipitation of Nb carbonitride in grains and grain boundaries can be suppressed. Therefore, it is possible to suppress the decrease in ductility of the iron casting and the occurrence of weld cracks.
- the upper limit of the second temperature range is preferably 1050°C, more preferably 1000°C, more preferably 950°C, more preferably 900°C, and preferably 850°C. More preferably 800°C, more preferably 750°C, more preferably 700°C, more preferably 650°C, more preferably 600°C, more preferably 550°C and more preferably 525°C.
- the lower limit of the second temperature range is preferably 50°C, more preferably 100°C, more preferably 150°C, more preferably 200°C, and more preferably 250°C. It is more preferably 300°C, more preferably 350°C, more preferably 400°C, more preferably 450°C, and even more preferably 475°C.
- the upper limit of the second time range is preferably 42 hours, more preferably 36 hours, more preferably 32 hours, more preferably 24 hours, more preferably 22 hours. more preferably 20 hours, more preferably 18 hours, more preferably 16 hours, more preferably 14 hours, more preferably 12 hours, 10 hours is more preferable.
- the lower limit of the second time range is preferably 0.5 hours, more preferably 1.0 hours, more preferably 1.5 hours, more preferably 2.0 hours. preferably 2.5 hours, more preferably 3.0 hours, more preferably 3.5 hours, more preferably 4.0 hours, 4.5 hours more preferably 5.0 hours, more preferably 5.5 hours, more preferably 6.0 hours, more preferably 6.5 hours , more preferably 7.0 hours, and even more preferably 7.5 hours.
- this iron casting is suitable for a wide variety of applications where excellent elongation properties are required.
- exhaust system parts exhaust manifolds, turbine housings, etc.
- this iron casting is suitable for manufacturing cast parts for exhaust system parts.
- this iron casting is suitable for a wide variety of applications that require complex shapes and low thermal expansion and/or high ductility to withstand high temperature strength and thermal fatigue.
- it is also suitable for manufacturing engine parts for aircraft and ships, and boilers and turbines for thermal power generation.
- the iron casting of the first embodiment is an iron casting obtained by subjecting a heat-treated object cast using the first form of the present material to the first form of the present heat treatment. That is, the iron casting of the first embodiment contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 1.0% by mass of Mn.
- the iron casting of the second embodiment is an iron casting obtained by performing the first form of the present heat treatment on a heat-treated object cast using the second form of the present material. That is, the iron casting of the second embodiment contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 1.0% by mass of Mn.
- Ni 16.0 to 21.0 wt% Cr, 0.3 to 0.8 wt% Nb, 0.0001 to 0.03 wt% N, and 0.1 to 0.3 wt% % of Ti with the balance being Fe and unavoidable elements.
- the iron casting of the third embodiment is an iron casting obtained by performing the second form of the present heat treatment on a heat-treated object cast using the first form of the present material. That is, the iron casting of the third embodiment contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 1.0% by mass of Mn.
- the iron casting of the fourth embodiment is an iron casting obtained by performing the second form of the present heat treatment on a heat-treated object cast using the second form of the present material. That is, the iron casting of the fourth embodiment contains 0.0001 to 0.03% by mass of C, 0.001 to 1.0% by mass of Si, and 0.001 to 1.0% by mass of Mn.
- Ni 16.0 to 21.0 wt% Cr, 0.3 to 0.8 wt% Nb, 0.0001 to 0.03 wt% N, and 0.1 to 0.3 wt% % of Ti with the balance being Fe and unavoidable elements.
- the "heat treatment object" in the first embodiment and the second embodiment in which the second heat treatment is not performed after the first heat treatment is "after casting, before performing the first heat treatment means "casting".
- the “object to be heat treated” in the third embodiment and the fourth embodiment in which the second heat treatment is performed after the first heat treatment is “after casting, before performing the first heat treatment” before the first heat treatment.
- "before the second heat treatment” means "the iron casting after the first heat treatment and before the second heat treatment”.
- the heat-treated object may be an iron casting before machining or an iron casting after machining.
- plastic working such as forging and rolling (hot working, cold working, etc.) was also performed. not applied.
- FIG. 1 shows the compositions of Examples 1 to 7 in the first embodiment and Example 8 in the second embodiment, and the compositions of Comparative Examples 1 and 2.
- FIG. 3A shows the compositions of Examples 9-43 in the third embodiment.
- FIG. 3B shows the compositions of Examples 44-77 in the third embodiment.
- FIG. 3C shows the compositions of Examples 78-105 and the compositions of Comparative Examples 3-5 in the fourth embodiment.
- the content (% by mass) of each element is a value measured by emission spectrometry using an emission spectrometer "PDA-8000" manufactured by Shimadzu Corporation. is.
- FIG. 2 shows the heat treatment conditions and mechanical properties of Examples 1 to 7 in the first embodiment and Example 8 in the second embodiment, and the heat treatment conditions and mechanical properties of Comparative Examples 1 and 2.
- FIG. 4A shows the heat treatment conditions and mechanical properties of Examples 9 to 43 in the third embodiment.
- FIG. 4B shows the heat treatment conditions and mechanical properties of Examples 44-77 in the third embodiment.
- FIG. 4C shows the heat treatment conditions and mechanical properties of Examples 78-105 and the heat treatment conditions and mechanical properties of Comparative Examples 3-5 in the fourth embodiment.
- holding temperature indicates the temperature at which the object to be heat treated is held in the heat treatment furnace (heat treatment apparatus).
- the holding time indicates the time during which the object to be heat-treated is held while the inside of the heat-treating furnace is kept at the holding temperature.
- the cooling method indicates a method of cooling the heat treatment object.
- natural air cooling is a method of naturally cooling an object to be heat treated in the air without using a cooling fan or the like after taking it out of the heat treatment furnace.
- Forced air cooling is a method of rapidly cooling the heat treatment object in air using a cooling fan or the like after it is removed from the heat treatment furnace.
- Furnace cooling is a method of gradually cooling an object to be heat treated in a heat treatment furnace.
- Oil cooling is a method of rapidly cooling an object to be heat treated in oil.
- Tensile strength (MPa), 0.2% yield strength (MPa) and elongation at break (%) are values measured according to JIS Z 2241 (metal material tensile test method) for iron casting test pieces after heat treatment. .
- As the test piece a No. 14A test piece with a diameter of 8 mm and a parallel length of 48 mm, which was taken from a Y-shaped No. B test material or a knock-off type test material cast by sand casting, was used.
- the holding temperature of the first heat treatment in Comparative Example 1 is less than 750° C.
- Examples 1 to 7 in the first embodiment and Example 8 in the second embodiment The holding temperature of the first heat treatment is 750° C. or higher.
- the breaking elongation of Comparative Example 1 is 8.42%
- the breaking elongation of Examples 1-8 is 12.03-17.95%. Therefore, in Examples 1 to 5, compared with Comparative Example 1, the elongation at break is improved by about 1.43 to 2.13 times.
- the lower limit of the holding temperature of the first heat treatment is set to 750 ° C., and the holding time is set to 0.5 to 6.0 hours, thereby improving the breaking elongation of the iron casting. is made.
- the holding temperature of the first heat treatment of Comparative Example 2 exceeds 1380° C., whereas the holding temperature of the first heat treatments of Examples 1 to 8 is 1380° C. or less.
- the breaking elongation of Comparative Example 2 is 10.18%, whereas the breaking elongation of Examples 1-8 is 12.03-17.95%. Therefore, in Examples 1 to 8, compared with Comparative Example 2, the elongation at break is improved by about 1.18 to 1.76 times.
- the upper limit of the holding temperature of the first heat treatment was set to 1380 ° C., and the holding time was set to 0.5 to 6.0 hours, thereby improving the breaking elongation of the iron casting. is made.
- Examples 9-105 and Examples 1-8) As shown in FIGS. 2, 4A, 4B and 4C, in Examples 1 to 8, the second heat treatment is not performed after the first heat treatment (see FIG. 2), whereas in the third embodiment In Examples 9 to 77 and Examples 78 to 105 in the fourth embodiment, the second heat treatment was performed after the first heat treatment (see FIGS. 4A, 4B and 4C).
- the holding temperature for the second heat treatment of Examples 9-105 is 20-1080° C. and the holding time is 0.3-48 hours.
- the elongation at break of Examples 1-8 is 12.03-17.95%
- the elongation at break of Examples 9-77 is 18.50-38.95%.
- Examples 9 to 77 the breaking elongation is improved by a maximum of about 3.24 times (minimum of about 1.04 times) as compared with Examples 1 to 8.
- the holding temperature of the second heat treatment is 20 to 1080 ° C. and the holding time is 0.3 to 48 hours, thereby further improving the breaking elongation of the iron casting. is made.
- Comparative Example 3 has an S content of 0.029% by mass, while Examples 9 to 77 have an upper limit of S content of 0.027%. % by mass.
- the breaking elongation of Comparative Example 3 is 8.85%, while the breaking elongation of Examples 9-77 is 18.50-29.75%. . Therefore, in Examples 9 to 77, compared with Comparative Example 3, the breaking elongation is improved by about 2.09 to 3.36 times.
- the breaking elongation of iron castings can be improved.
- Comparative Example 4 and Examples 9 to 77 are common in that they do not contain Ti.
- the holding temperature of the second heat treatment of Comparative Example 4 exceeds 1080° C.
- the holding temperature of the second heat treatments of Examples 9 to 77 is below 1080°C.
- the breaking elongation of Comparative Example 4 is 9.88%
- the breaking elongation of Examples 9-77 is 18.50-29.75%. Therefore, in Examples 9 to 77, compared with Comparative Example 4, the elongation at break is improved by about 1.87 to 3.01 times.
- the breaking elongation of iron castings can be improved by setting the upper limit of the holding temperature of the second heat treatment to 1080 ° C. and setting the holding time to 0.3 to 48 hours. ing.
- Examples 9 to 77 do not contain Ti, whereas Examples 78 to 105 contain 0.1 to 0.3% by mass of Ti. I have to.
- the holding temperature of the second heat treatment of Examples 9 to 77 and Examples 78 to 105 are all 20 to 1080 ° C., and the holding time is 0.3 to 1080 ° C. They are common in that they are 48 hours.
- the elongation at break of Examples 9-77 is 18.50-29.75%
- the elongation at break of Examples 78-105 is 21.98-38.95%.
- Examples 78 to 105 the maximum breaking elongation is improved by about 1.31 times and the minimum breaking elongation is improved by about 1.19 times as compared with Examples 9 to 77.
- the Ti content was 0.1 to 0.3% by mass
- the holding temperature of the second heat treatment was 20 to 1080° C.
- the holding time was 0.3 to 48 hours.
- One aspect of the method for manufacturing the iron casting of the above embodiment is to cast a heat treatment target using a ferritic casting material, and after casting the heat treatment target, the first and performing a heat treatment of Another aspect of the method of manufacturing the iron casting of the above embodiment is to cast the heat-treated object using a ferritic casting material, and after casting the heat-treated object, the heat-treated object is subjected to the first and performing a second heat treatment on the heat-treated object after performing the first heat treatment.
- Performing the first heat treatment includes holding the heat-treated object in a first temperature range of 750 to 1380.degree.
- Holding the first temperature range includes holding the heat-treated object for a first time range of 0.5 to 6.0 hours.
- Performing the second heat treatment includes holding the heat-treated object at a second temperature range of 20 to 1080°C.
- Holding the second temperature range includes holding the heat treated object for a second time range of 0.3 to 48 hours.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
フェライト系の鋳造用材料(以下「本材料」という。)の第1の形態は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNとを含み、残部がFeおよび不可避元素である。
本材料の第1の形態は、0.0001~0.03質量%のCを含む。本材料の第1の形態においては、Cの含有量の上限を0.03質量%にすることで、NとともにCをNb炭窒化物として固定することにより、Cr炭窒化物の生成を低減することができる。このため、フェライト相中のCrの含有量の減少を抑制することができる。したがって、鉄鋳物の耐食性の低下を抑制することができる。また、Cの含有量の上限を0.03質量%にすることで、高温域におけるオーステナイト相の析出を抑制することができる。このため、Crの拡散速度を低下させやすいオーステナイト相の割合を減少させることにより、鉄鋳物の酸化被膜に対するCrの供給量を確保することができる。したがって、鉄鋳物の耐食性を向上させることができる。また、Cの含有量の上限を0.03質量%にすることで、NとともにCをNb炭窒化物として固定しながらもNb炭窒化物の過剰な生成を抑制することができる。このため、結晶粒内や結晶粒界におけるNb炭窒化物の過剰な析出を抑制することができる。したがって、鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。さらに、Nb炭窒化物の過剰な生成を抑制することができるため、フェライト相へのNbの固溶量の減少を抑制することができる。したがって、鉄鋳物の高温強度を向上させることができる。Cの含有量の上限は、0.02質量%であることが好ましい。Cr炭窒化物やNb炭窒化物の析出を一層抑制することができる。したがって、鉄鋳物の耐食性の低下や脆化を一層抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.001~1.0質量%のSiを含む。本材料の第1の形態においては、Siの含有量の上限を1.0質量%にすることで、フェライト相へのSiの固溶量の増加を抑制することができる。したがって、鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。また、Siの含有量の上限を1.0質量%にすることで、二酸化ケイ素等の非金属介在物(酸化物)の凝集を抑制することができる。したがって、鉄鋳物の表面欠陥や内部欠陥の発生を抑制することができる。Siの含有量の下限は、0.4質量%であることが好ましい。二酸化ケイ素等の非金属介在物をNb炭窒化物の析出核として作用させることができる。このため、Nb炭窒化物の凝集を抑制し、結晶粒内にNb炭窒化物を均一に分散させやすい。したがって、結晶粒内におけるNb炭窒化物の過剰な成長を抑制することにより、鉄鋳物の脆性破壊を抑制することができる。Siの含有量の上限は、0.6質量%であることが好ましい。結晶粒内にNb炭窒化物を一層均一に分散させやすく、Nb炭窒化物の過剰な成長を一層抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.001~1.0質量%のMnを含む。本材料の第1の形態においては、オーステナイト化元素であるMnの含有量の上限を1.0質量%にすることで、オーステナイト相の析出を抑制することができる。このため、常温域から高温域にわたりフェライト相を安定させることができる。また、Mnの含有量の上限を1.0質量%にすることで、最終凝固部に偏析しやすいMnがSとともに形成する硫化マンガン等の非金属介在物(硫化物)の過剰な生成を抑制することができる。このため、硫化マンガン等の非金属介在物を析出核として、Nb炭窒化物が結晶粒内や結晶粒界に析出することを抑制することができる。したがって、特に結晶粒界に析出したNb炭窒化物による粒界脆化の発生を抑制することができる。Mnの含有量の上限は、0.2質量%であることが好ましく、0.15質量%であることがより好ましい。結晶粒界に析出する硫化マンガン等の非金属介在物の量を低減することができる。このため、二酸化ケイ素等の非金属介在物をNb炭窒化物の析出核として優先的に作用させやすく、結晶粒内にNb炭窒化物を均一に分散させやすい。本材料の下記形態においても同様である。
本材料の第1の形態は、0.0001~0.04質量%のPを含む。本材料の第1の形態においては、Pの含有量の上限を0.04質量%にすることで、フェライト相へのPの固溶量の増加を抑制することができる。したがって、鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。Pの含有量の上限は、0.03質量%であることが好ましい。鉄鋳物の脆化を一層抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.0001~0.027質量%のSを含む。本材料の第1の形態においては、Sの含有量の上限を0.027質量%にすることで、最終凝固部に偏析しやすいSがMnとともに形成する硫化マンガン等の非金属介在物(硫化物)の過剰な生成を抑制することができる。このため、硫化マンガン等の非金属介在物を析出核として、Nb炭窒化物が結晶粒内や結晶粒界に過剰に析出することを抑制することができる。したがって、特に結晶粒界に析出したNb炭窒化物による粒界脆化の発生を抑制することができる。Sの含有量の上限は、0.025質量%であることが好ましく、0.020質量%であることがより好ましく、0.015質量%であることがさらに好ましい。Sの含有量の下限は、0.001質量%であることが好ましく、0.004質量%であることがより好ましい。結晶粒界に析出する硫化マンガン等の非金属介在物の量を低減することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.3~0.8質量%のCuを含む。本材料の第1の形態においては、Cuの含有量を0.3~0.8質量%にすることで、鉄鋳物の耐食性を向上させることができる。Cuの含有量の下限は、0.4質量%であることが好ましい。鉄鋳物の耐食性の低下を抑制することができる。Cuの含有量の上限は、0.5質量%であることが好ましい。Cuの析出を抑制し、鉄鋳物の延性の低下を抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.001~0.6質量%のNiを含む。本材料の第1の形態においては、オーステナイト化元素であるNiの含有量の上限を0.6質量%にすることで、オーステナイト相の析出を抑制することができる。このため、常温域から高温域にわたりフェライト相を安定させることができる。また、Niの含有量の上限を0.6質量%にすることで、オーステナイト相の析出による熱膨張係数の増加を抑制するとともに、高温域における耐酸化性の低下を抑制することができる。Niの含有量の上限は、0.4質量%であることが好ましく、0.3質量%であることがより好ましい。合金コストの増大を抑制しつつ、鉄鋳物の耐食性を向上させることができる。本材料の下記形態においても同様である。
本材料の第1の形態は、16.0~21.0質量%のCrを含む。本材料の第1の形態においては、フェライト化元素であるCrの含有量を16.0~21.0質量%にすることで、常温域から高温域にわたりフェライト相を安定させることができる。また、Crの含有量を16.0~21.0質量%にすることで、鉄鋳物の耐食性を向上させることができる。Crの含有量の下限は、18.0質量%であることが好ましい。鉄鋳物の耐食性を一層向上させることができる。Crの含有量の上限は、19.0質量%であることが好ましい。σ相等の脆化相の析出を抑制し、鉄鋳物の延性の低下を抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.3~0.8質量%のNbを含む。本材料の第1の形態においては、Nbの含有量を0.3~0.8質量%にすることで、フェライト相へNbを固溶させ、鉄鋳物の高温強度を向上させることができる。また、CやNをNb炭窒化物として固定し、Cr炭窒化物の生成を抑制することで耐酸化性能を向上させることができる。Nbの含有量の上限は、0.6質量%であることが好ましく、0.4質量%であることがより好ましい。過剰な固溶強化やNb炭窒化物の過剰な生成による鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態は、0.0001~0.03質量%のNを含む。本材料の第1の形態においては、Nの含有量の上限を0.03質量%にすることで、NがCとともに形成するCr炭窒化物の生成を低減することができる。このため、フェライト相中のCrの含有量の減少を抑制することができる。したがって、鉄鋳物の耐食性の低下を抑制することができる。また、Nの含有量の上限を0.03質量%にすることで、高温域におけるオーステナイト相の析出を抑制することができる。このため、Crの拡散速度を低下させやすいオーステナイト相の割合を減少させることにより、鉄鋳物の酸化被膜に対するCrの供給量を確保することができる。したがって、鉄鋳物の耐食性を向上させることができる。また、NがCとともに形成するNb炭窒化物の過剰な生成を抑制することができる。このため、結晶粒内や結晶粒界におけるNb炭窒化物の過剰な析出を抑制することができる。したがって、鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。また、Nb炭窒化物の過剰な生成を抑制することができるため、フェライト相へのNbの固溶量の減少を抑制することができる。したがって、鉄鋳物の高温強度を向上させることができる。Nの含有量の上限は、0.02質量%であることが好ましい。Cr炭窒化物やNb炭窒化物の析出を一層抑制することができる。したがって、鉄鋳物の耐食性の低下や脆化を一層抑制することができる。本材料の下記形態においても同様である。
本材料の第1の形態における残部は、Feおよび不可避元素である。残部に含まれる不可避元素としては、例えば、Al(アルミニウム)、Mo(モリブデン)、V(バナジウム)、Co(コバルト)、Sn(スズ)、Ce(セリウム)、Te(テルル)、La(ランタン)、Bi(ビスマス)、Zn(亜鉛)等の元素が挙げられる。不可避元素の含有量は、例えば、合計で5.0質量%以下であることが好ましく、合計で3.0質量%以下であることがより好ましく、合計で1.0質量%以下であることがより好ましく、合計で0.5質量%以下であることがより好ましく、合計で0.2質量%以下であることがより好ましく、合計で0.1質量%以下であることがさらに好ましい。本材料の下記形態においても同様である。
本材料の第2の形態は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNと、0.1~0.3質量%のTiとを含み、残部がFeおよび不可避元素である。
本材料の第2の形態は、0.1~0.3質量%のTiを含む。本材料の第2の形態においては、Tiの含有量を0.1~0.3質量%にすることで、結晶粒を微細化し、フェライト相中における結晶粒界の割合を増加させることができる。このため、結晶粒界における溶質元素の偏析濃度を低下させやすい。したがって、鉄鋳物の伸びを向上させやすい。Tiの含有量の下限を0.1質量%にすることで、結晶粒の微細化を促進することができる。Tiの含有量の上限を0.3質量%にすることで、過剰な固溶強化やTi酸化物の過剰な生成による鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。また、Cの含有量の上限を0.03質量%にし、Nの含有量の上限を0.03質量%にするとともに、Tiの含有量を0.1~0.3質量%にすることで、Ti窒化物やTi炭窒化物の過剰な生成を抑制することができる。このため、結晶粒内や結晶粒界におけるTi窒化物やTi炭窒化物の過剰な析出を抑制することができる。したがって、鉄鋳物の延性の低下を抑制し、溶接割れの発生も抑制することができる。また、Ti窒化物やTi炭窒化物の過剰な生成を抑制することができるため、フェライト相へのTiの固溶量の減少を抑制することができる。したがって、鉄鋳物の高温強度を向上させることができる。
本材料を用いて鋳造した熱処理対象物に対して行う熱処理(以下「本熱処理」という。)の第1の形態は、熱処理対象物に対して第1の熱処理(固溶化処理、一次熱処理)を行うことを含む。第1の熱処理を行うことは、熱処理対象物を750~1380℃の第1の温度範囲で保持することを含む。第1の温度範囲で保持することは、熱処理対象物を0.5~6.0時間の第1の時間範囲で保持することを含む。
本熱処理の第2の形態は、第1の熱処理を行うことの後に、熱処理対象物に対して第2の熱処理(時効処理、二次熱処理)を行うことを含む。第2の熱処理を行うことは、熱処理対象物を20~1080℃の第2の温度範囲で保持することを含む。第2の温度範囲で保持することは、熱処理対象物を0.3~48時間の第2の時間範囲で保持することを含む。
第1の実施形態の鉄鋳物は、本材料の第1の形態を用いて鋳造した熱処理対象物に対して本熱処理の第1の形態を行うことにより得られる鉄鋳物である。すなわち、第1の実施形態の鉄鋳物は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNとを含み、残部がFeおよび不可避元素である本材料を用いて鋳造した熱処理対象物に対して、第1の熱処理を行うことにより得られる。
第2の実施形態の鉄鋳物は、本材料の第2の形態を用いて鋳造した熱処理対象物に対して本熱処理の第1の形態を行うことにより得られる鉄鋳物である。すなわち、第2の実施形態の鉄鋳物は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNと、0.1~0.3質量%のTiとを含み、残部がFeおよび不可避元素である本材料を用いて鋳造した熱処理対象物に対して、第1の熱処理を行うことにより得られる。
第3の実施形態の鉄鋳物は、本材料の第1の形態を用いて鋳造した熱処理対象物に対して本熱処理の第2の形態を行うことにより得られる鉄鋳物である。すなわち、第3の実施形態の鉄鋳物は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNとを含み、残部がFeおよび不可避元素である本材料を用いて鋳造した熱処理対象物に対して、第1の熱処理を行うことの後に、第2の熱処理を行うことにより得られる。
第4の実施形態の鉄鋳物は、本材料の第2の形態を用いて鋳造した熱処理対象物に対して本熱処理の第2の形態を行うことにより得られる鉄鋳物である。すなわち、第4の実施形態の鉄鋳物は、0.0001~0.03質量%のCと、0.001~1.0質量%のSiと、0.001~1.0質量%のMnと、0.0001~0.04質量%のPと、0.0001~0.027質量%のSと、0.3~0.8質量%のCuと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrと、0.3~0.8質量%のNbと、0.0001~0.03質量%のNと、0.1~0.3質量%のTiとを含み、残部がFeおよび不可避元素である本材料を用いて鋳造した熱処理対象物に対して、第1の熱処理を行うことの後に、第2の熱処理を行うことにより得られる。
図1に、第1の実施形態における実施例1~7および第2の実施形態における実施例8の組成と、比較例1~2の組成とを示している。図3Aに、第3の実施形態における実施例9~43の組成を示している。図3Bに、第3の実施形態における実施例44~77の組成を示している。図3Cに、第4の実施形態における実施例78~105の組成と、比較例3~5の組成とを示している。図1、図3A、図3Bおよび図3Cにおいて、各元素の含有量(質量%)は、株式会社島津製作所製の発光分光分析装置「PDA-8000」を用いて発光分光分析法により測定した値である。
図2に示すように、比較例1の第1の熱処理の保持温度は750℃未満であるのに対して、第1の実施形態における実施例1~7および第2の実施形態における実施例8の第1の熱処理の保持温度は750℃以上である。ここで、比較例1の破断伸びは8.42%であるのに対して、実施例1~8の破断伸びは12.03~17.95%である。したがって、実施例1~5では、比較例1と比べて破断伸びが1.43~2.13倍程度向上している。このように、実施例1~8では、第1の熱処理の保持温度の下限を750℃にし、保持時間を0.5~6.0時間にすることで、鉄鋳物の破断伸びを向上させることができている。また、比較例2の第1の熱処理の保持温度は1380℃を超過するのに対して、実施例1~8の第1の熱処理の保持温度は1380℃以下である。ここで、比較例2の破断伸びは10.18%であるのに対して、実施例1~8の破断伸びは12.03~17.95%である。したがって、実施例1~8では、比較例2と比べて破断伸びが1.18~1.76倍程度向上している。このように、実施例1~8では、第1の熱処理の保持温度の上限を1380℃にし、保持時間を0.5~6.0時間にすることで、鉄鋳物の破断伸びを向上させることができている。
図2、図4A、図4Bおよび図4Cに示すように、実施例1~8では第1の熱処理後に第2の熱処理を行わないのに対して(図2参照)、第3の実施形態における実施例9~77および第4の実施形態における実施例78~105では第1の熱処理後に第2の熱処理を行っている(図4A、図4Bおよび図4C参照)。実施例9~105の第2の熱処理の保持温度は20~1080℃で、保持時間は0.3~48時間である。ここで、実施例1~8の破断伸びは12.03~17.95%であるのに対して、実施例9~77の破断伸びは18.50~38.95%である。したがって、実施例9~77では、実施例1~8と比べて破断伸びが最大3.24倍程度(最小でも1.04倍程度)向上している。このように、実施例9~77では、第2の熱処理の保持温度を20~1080℃にし、保持時間を0.3~48時間にすることで、鉄鋳物の破断伸びをより一層向上させることができている。
図3A、図3Bおよび図3Cに示すように、比較例3はSの含有量が0.029質量%であるのに対して、実施例9~77はSの含有量の上限を0.027質量%にしている。図4A、図4Bおよび図4Cに示すように、比較例3の破断伸びは8.85%であるのに対して、実施例9~77の破断伸びは18.50~29.75%である。したがって、実施例9~77では、比較例3と比べて破断伸びが2.09~3.36倍程度向上している。このように、実施例9~77では、Sの含有量の上限を0.027質量%にすることで、鉄鋳物の破断伸びを向上させることができている。
図3A、図3Bおよび図3Cに示すように、比較例4および実施例9~77はいずれもTiを含有していない点で共通している。一方、図4A、図4Bおよび図4Cに示すように、比較例4の第2の熱処理の保持温度は1080℃を超過するのに対して、実施例9~77の第2の熱処理の保持温度は1080℃以下である。ここで、比較例4の破断伸びは9.88%であるのに対して、実施例9~77の破断伸びは18.50~29.75%である。したがって、実施例9~77では、比較例4と比べて破断伸びが1.87~3.01倍程度向上している。このように、実施例9~77では、第2の熱処理の保持温度の上限を1080℃にし、保持時間を0.3~48時間にすることで、鉄鋳物の破断伸びを向上させることができている。
図4Cに示すように、比較例5の第2の熱処理の保持温度は1080℃を超過するのに対して、実施例78~105の第2の熱処理の保持温度は1080℃以下である。ここで、比較例5の破断伸びは18.50%であるのに対して、実施例78~105の破断伸びは21.98~38.95%である。したがって、実施例78~105では、比較例5と比べて破断伸びが1.19~2.11倍程度向上している。このように、実施例78~105では、第2の熱処理の保持温度の上限を1080℃にし、保持時間を0.3~48時間にすることで、鉄鋳物の破断伸びを向上させることができている。
図3A、図3Bおよび図3Cに示すように、実施例9~77はTiを含有していないのに対して、実施例78~105はTiの含有量を0.1~0.3質量%にしている。図4A、図4Bおよび図4Cに示すように、実施例9~77および実施例78~105の第2の熱処理の保持温度はいずれも20~1080℃で、保持時間はいずれも0.3~48時間である点で共通している。ここで、実施例9~77の破断伸びは18.50~29.75%であるのに対して、実施例78~105の破断伸びは21.98~38.95%である。したがって、実施例78~105では、実施例9~77と比べて破断伸びの最大値が1.31倍程度向上し、破断伸びの最小値が1.19倍程度向上している。このように、実施例78~105では、Tiの含有量を0.1~0.3質量%にし、第2の熱処理の保持温度を20~1080℃にし、保持時間を0.3~48時間にすることで、鉄鋳物の破断伸びの最大値および最小値を向上させることができている。
Claims (9)
- フェライト系の鋳造用材料を用いて鋳造した熱処理対象物に対して第1の熱処理を行うことにより得られる鉄鋳物であって、
前記鋳造用材料は、0.0001~0.03質量%のCと、0.001~0.6質量%のNiと、16.0~21.0質量%のCrとを含み、残部がFeおよび不可避元素であり、
前記第1の熱処理を行うことは、前記熱処理対象物を750~1380℃の第1の温度範囲で保持することを含む、鉄鋳物。 - 請求項1において、
前記第1の温度範囲で保持することは、前記熱処理対象物を0.5~6.0時間の第1の時間範囲で保持することを含む、鉄鋳物。 - 請求項1または2において、
前記第1の熱処理を行うことの後に、前記熱処理対象物に対して第2の熱処理を行うことにより得られる鉄鋳物であって、
前記第2の熱処理を行うことは、前記熱処理対象物を20~1080℃の第2の温度範囲で保持することを含む、鉄鋳物。 - 請求項3において、
前記第2の温度範囲で保持することは、前記熱処理対象物を0.3~48時間の第2の時間範囲で保持することを含む、鉄鋳物。 - 請求項1~4のいずれか一項において、
前記鋳造用材料は、0.0001~0.03質量%のNをさらに含む、鉄鋳物。 - 請求項1~5のいずれか一項において、
前記鋳造用材料は、0.001~1.0質量%のMnをさらに含む、鉄鋳物。 - 請求項1~6のいずれか一項において、
前記鋳造用材料は、0.1~0.3質量%のTiをさらに含む、鉄鋳物。 - フェライト系の鋳造用材料を用いて鋳造した熱処理対象物に対して第1の熱処理を行うことにより得られる鉄鋳物であって、
前記第1の熱処理を行うことは、前記熱処理対象物を750~1380℃の第1の温度範囲で保持することを含む、鉄鋳物。 - 請求項8において、
前記第1の熱処理を行うことの後に、前記熱処理対象物に対して第2の熱処理を行うことにより得られる鉄鋳物であって、
前記第2の熱処理を行うことは、前記熱処理対象物を20~1080℃の第2の温度範囲で保持することを含む、鉄鋳物。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202280015514.7A CN116867920A (zh) | 2021-03-29 | 2022-03-29 | 铁铸件 |
JP2023511432A JPWO2022210793A1 (ja) | 2021-03-29 | 2022-03-29 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021054931 | 2021-03-29 | ||
JP2021-054931 | 2021-03-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022210793A1 true WO2022210793A1 (ja) | 2022-10-06 |
Family
ID=83459465
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/015705 WO2022210793A1 (ja) | 2021-03-29 | 2022-03-29 | 鉄鋳物 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPWO2022210793A1 (ja) |
CN (1) | CN116867920A (ja) |
WO (1) | WO2022210793A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0533105A (ja) * | 1991-07-31 | 1993-02-09 | Daido Steel Co Ltd | フエライト系耐熱鋳鋼 |
JPH08225898A (ja) * | 1995-02-17 | 1996-09-03 | Daido Steel Co Ltd | 耐熱鋳鋼 |
CN105063496A (zh) * | 2015-09-02 | 2015-11-18 | 祁同刚 | 一种铁素体不锈钢及其制造工艺 |
JP2016509629A (ja) * | 2013-01-09 | 2016-03-31 | ザ・ナノスティール・カンパニー・インコーポレーテッド | 管状製品用の新しいクラスの鋼 |
-
2022
- 2022-03-29 WO PCT/JP2022/015705 patent/WO2022210793A1/ja active Application Filing
- 2022-03-29 JP JP2023511432A patent/JPWO2022210793A1/ja active Pending
- 2022-03-29 CN CN202280015514.7A patent/CN116867920A/zh active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0533105A (ja) * | 1991-07-31 | 1993-02-09 | Daido Steel Co Ltd | フエライト系耐熱鋳鋼 |
JPH08225898A (ja) * | 1995-02-17 | 1996-09-03 | Daido Steel Co Ltd | 耐熱鋳鋼 |
JP2016509629A (ja) * | 2013-01-09 | 2016-03-31 | ザ・ナノスティール・カンパニー・インコーポレーテッド | 管状製品用の新しいクラスの鋼 |
CN105063496A (zh) * | 2015-09-02 | 2015-11-18 | 祁同刚 | 一种铁素体不锈钢及其制造工艺 |
Also Published As
Publication number | Publication date |
---|---|
CN116867920A (zh) | 2023-10-10 |
JPWO2022210793A1 (ja) | 2022-10-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
TWI601833B (zh) | Pickling property, the bolt wire excellent in delayed fracture resistance after quenching and tempering, and a bolt | |
US20180148817A1 (en) | METHOD FOR PRODUCING Ni-BASED SUPERALLOY MATERIAL | |
JPH09279309A (ja) | Fe−Cr−Ni系耐熱合金 | |
JP6160787B2 (ja) | 薄板及びその製造方法 | |
JP6160942B1 (ja) | 低熱膨張超耐熱合金及びその製造方法 | |
JP7009278B2 (ja) | 耐熱性に優れたフェライト系ステンレス鋼板および排気部品とその製造方法 | |
JP2003113434A (ja) | 耐高温硫化腐食特性に優れる超耐熱合金およびその製造方法 | |
JPS5834129A (ja) | 耐熱金属材料の製造方法 | |
JP7050520B2 (ja) | 排気部品用オーステナイト系ステンレス鋼板および排気部品ならびに排気部品用オーステナイト系ステンレス鋼板の製造方法 | |
JP7166082B2 (ja) | オーステナイト系ステンレス鋼板およびその製造方法 | |
JPWO2019045001A1 (ja) | 合金板及びガスケット | |
JP3483493B2 (ja) | 圧力容器用鋳鋼材及びそれを用いる圧力容器の製造方法 | |
CN106636850B (zh) | 高温抗氧化性高强度掺稀土合金材料及制备方法 | |
JP2009041103A (ja) | 排ガス再循環系部品用オーステナイト系ステンレス鋼およびその製造方法 | |
WO2022210793A1 (ja) | 鉄鋳物 | |
JP2002206143A (ja) | 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 | |
CN102691016A (zh) | 沉淀硬化型耐热钢 | |
JP2543417B2 (ja) | 弁用鋼 | |
JPS61238942A (ja) | 耐熱合金 | |
US20180002784A1 (en) | Ni-BASED ALLOY HAVING EXCELLENT HIGH-TEMPERATURE CREEP CHARACTERISTICS, AND GAS TURBINE MEMBER USING THE SAME | |
JP6690499B2 (ja) | オーステナイト系ステンレス鋼板及びその製造方法 | |
JP2000192205A (ja) | 耐酸化性に優れた耐熱合金 | |
JPH07238349A (ja) | 耐熱鋼 | |
JP7445744B2 (ja) | 高温耐クリープ性が向上したフェライト系ステンレス冷延焼鈍鋼板およびその製造方法 | |
JP2004018897A (ja) | 高クロム合金鋼及びそれを使用したタービンロータ |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22781004 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2023511432 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280015514.7 Country of ref document: CN |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 22781004 Country of ref document: EP Kind code of ref document: A1 |