WO2003062483A1 - Fil d'acier pour ressorts thermoresistants, ressorts thermoresistants, et procede de production de ressorts thermoresistants - Google Patents
Fil d'acier pour ressorts thermoresistants, ressorts thermoresistants, et procede de production de ressorts thermoresistants Download PDFInfo
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- WO2003062483A1 WO2003062483A1 PCT/JP2002/000525 JP0200525W WO03062483A1 WO 2003062483 A1 WO2003062483 A1 WO 2003062483A1 JP 0200525 W JP0200525 W JP 0200525W WO 03062483 A1 WO03062483 A1 WO 03062483A1
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- heat
- temperature
- steel wire
- resistant spring
- resistant
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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
- 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
- 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
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- 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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
Definitions
- the present invention relates to the manufacture of heat-resistant parts such as automobile engine exhaust system parts, heat-resistant spring steel wires having a ⁇ -phase (austenite) metal structure, mainly used as spring materials, heat-resistant springs and heat-resistant springs About the method.
- heat-resistant parts such as automobile engine exhaust system parts, heat-resistant spring steel wires having a ⁇ -phase (austenite) metal structure, mainly used as spring materials, heat-resistant springs and heat-resistant springs About the method.
- austenitic stainless steel or precipitation stainless steel such as SUS304, SUS316, and SUS631J1, which have been conventionally used as heat-resistant steel, is used as the spring component material used in the exhaust system of automobile engines. ing.
- precipitation-strengthened austenitic stainless steel such as SUS631 is used as the material for the spring parts.
- this precipitation-strengthened austenitic stainless steel is unavoidable because of the increase in cost due to a decrease in the yield of hot working and the increase in manufacturing costs due to long-term aging heat treatment at high temperatures.
- solid solution strengthening has been performed by adding an interstitial solid solution element such as C and N and a ferrite forming element such as W, Mo, V, Nb and Si. I have. ⁇
- Japanese Patent Application Laid-Open No. 11-12695 discloses a prior art in which the heat-resistant spring characteristics have been improved with a focus on N solid solution.
- This technology combines JIS SUS316N, a wire with high N content, with annealing at high temperatures to draw SUS316N, which is a JIS steel type, to increase the elastic limit.
- the technique described in Japanese Patent Application Laid-Open No. 2000-239804 is based on the addition of an element, the average crystal grain size of the y-phase (austenite) and the aspect ratio of the crystal grain in the longitudinal section (major axis / minor axis ratio).
- the heat-resistant properties of heat-resistant steel with N solid solution strengthening vary depending on the heat treatment conditions and the area reduction.
- the strengthening factor is closely related to non-uniform plastic deformation due to processing such as coiling. Therefore, in order to obtain the high-temperature tensile strength and high-temperature sag resistance required for a heat-resistant spring material, it is necessary to specify appropriate metal structures and manufacturing conditions. Disclosure of the invention
- An object of the present invention is to provide a high-strength heat-resistant spring steel wire having excellent high-temperature sag resistance required for a spring material at a high temperature range of 350 ° C or more and 500 ° C or less, particularly at about 400 ° C. You.
- Another object of the present invention is to provide a heat-resistant spring having excellent heat-resistant properties using the above-mentioned steel wire and a method for producing the heat-resistant spring.
- the steel wire for heat-resistant springs of the present invention can stabilize the y-phase (austenite) by adding a relatively large amount of N to an Fe-based austenitic stainless steel, and provide interstitial elements such as N, Mo, Nb,
- the above object is achieved by strengthening the solid solution with ferrite-forming elements such as Ti and Si.
- the steel wire for a heat-resistant spring of the present invention is represented by mass%: C: 0.01 to 0.08, N: 0.18 to 0.25, Mn: 0.5 to 4.0, Cr: 16 to 20. , Ni: 8.0 to 10.5, Mo: 0.1 to 3.0, Nb: 0.1 to 2.0, Ti: 0.1 to 2.0, Si: 0.3
- the cross section refers to a cross section in a direction perpendicular to the drawing direction.
- Interstitial solid solution elements such as C and N are contained in the ⁇ phase (austenite), which is the matrix, to strengthen the solid phase by generating strain in the crystal lattice and to fix dislocations in the metal structure.
- ⁇ phase austenite
- Cottrell atmosphere a state in which solute atoms gather around dislocations due to elastic interaction between dislocations and solute atoms, and are in an energetically stable state.
- solid solution strengthening by adding ferrite-forming elements such as Mo, Nb, Ti, and Si ensures high heat resistance even at high temperatures of 350 ° C or more and 500 ° C or less, especially around 400 ° C. It is possible to get.
- This effect of fixing dislocations is further enhanced by performing low-temperature annealing that also serves as strain relief after performing spring processing (such as coiling).
- low-temperature annealing at 500 ° C or more and 550 ° C or less is expected to increase the strength by 15 % or more, and the steel wire is particularly excellent in high-temperature sag resistance.
- the steel wire for heat-resistant springs of the present invention controls the maximum crystal grain size of 1 / phase (austenite) in the cross section of the steel wire to less than 12 m, thereby reducing stress concentration and improving high-temperature set resistance. Things.
- the present inventors have found that the increase or decrease in stress applied at high temperatures
- variations in the crystal size in the metal structure greatly affect the heat resistance. That is, for example, if there is only one locally large crystal in a metal structure compared to the other, stress concentration occurs because the coarse crystal is weak in strength. As a result, coarse crystals are a source of local sag (plastic deformation at high temperatures).
- the present inventors manage the maximum crystal grain size of the ⁇ phase (austenite), reduce stress concentration, and improve high-temperature resistance.
- control of the maximum crystal grain size of the ⁇ phase (austenite) to less than 12 ⁇ is realized by considering the solution heat treatment condition and the drawing condition. Specifically, the temperature of the solid solution heat treatment is set relatively low to reduce the average value of the crystal grain size, and the entire steel wire is uniformly heated to suppress the variation of the crystal grain size.
- the holding time should be long and the holding time should be short enough to prevent the growth of crystal grains. Then, select an appropriate reduction rate for the wire drawing as needed.
- the temperature of the solution heat treatment is preferably 950 to 1200 ° C, particularly preferably 950 to 1100 ° C.
- the holding time is 0.3 minutes / mn in the ratio of heat treatment holding time (min) / wire diameter (mm). ⁇ 5 min / mm is preferred.
- uniform heating of the entire steel wire and suppression of crystal grain growth can be achieved by rapid heating such as high-frequency heating.
- the specific heating rate is preferably from 300 ° C / min to 2000 ° C / min.
- the higher the solution heat treatment temperature and the longer the heating time the more crystal grains grow and the larger the grain size.
- variations in particle size occur due to local temperature variations in the furnace and temperature variations from the wire surface to the wire center due to wire diameter.
- the present invention suppresses the growth of crystal grains and the variation of the particle size by the above-mentioned temperature and holding time.
- the final area reduction rate in wire drawing is suitable from 50 ° / ⁇ to 70 ° / ⁇ . In particular, 55-65% Is preferred.
- the reason why the area reduction rate is set to 50% or more is that if the area is less than 50%, the elastic limit is small, and the high-temperature set resistance is reduced.
- the reason why the area reduction is set to 70% or less is that if the temperature is 70 ° / 0 or more, excessive dislocations cause deterioration in high-temperature sag resistance. ⁇
- the present invention defines the lower limit of the tensile strength coiling minimum required 1300N / mrti 2 than on the like, to 2000N / mra 2 or less in view of the toughness necessary to the upper limit on such coiling.
- the tensile strength defined in the present invention is a tensile strength at room temperature of a steel wire after solution heat treatment and wire drawing and before spring working or low-temperature annealing.
- the steel wire for a heat-resistant spring of the present invention preferably further contains Co: 0.2 to 2.0% by mass.
- Co precipitation strengthening of the intermetallic compound occurs, and the resistance to high-temperature resistance can be improved.
- the steel wire for heat-resistant springs of the present invention has sufficient performance as a spring material, for example, having fatigue resistance as a spring characteristic, and then, in order to exhibit heat resistance, the surface roughness of the steel wire is 1 to Rz. 20 ⁇ .
- the reason why the surface roughness is set to 20111 or less in Rz in the present invention is as follows. In springs used in automobile exhaust systems, etc., in which the increase and decrease in stress applied at high temperatures are repeated in a relatively short time, stress concentration occurs on the surface flaws of the spring, resulting in local settling I do. That is, the surface flaw of the spring is caused by a local set. Therefore, the present invention reduces the stress concentration after spring processing by reducing the surface roughness of the steel wire.
- the surface roughness of 20 m or less in Rz is achieved by the conventional process management such as the drawing conditions such as the die configuration and the drawing speed, and the handling of steel wires during heat treatment. Further, it may be changed by electrolytic polishing or the like. The smaller the surface roughness, the better, but the smoothing is usually very costly.
- Rz is set to ⁇ ⁇ or more in order to further reduce the cost.
- the surface roughness of the steel wire refers to the surface roughness in the drawing direction of the steel wire.
- Such a steel wire for a heat-resistant spring of the present invention is preferably used for producing a heat-resistant spring or the like which requires heat resistance.
- the method for producing a heat-resistant spring of the present invention a spring excellent in set resistance even in a high temperature range is obtained by defining appropriate heat treatment conditions. That is, the method for producing a heat-resistant spring of the present invention is characterized in that after the above-described steel wire for a heat-resistant spring according to the present invention is subjected to spring processing, the spring is subjected to low annealing at a temperature of 450 ° C or more and 600 ° C or less. I do.
- the manufacturing method of the heat-resistant spring of the present invention is a method of producing a heat-resistant spring by N. Is formed. Then, by strengthening the structure by forming a Cottrell atmosphere, a heat-resistant spring having excellent sag resistance can be obtained even in a high temperature range (350 ° C or more and 500 ° C or less, particularly about 400 ° C).
- the annealing temperature is preferably 500 ° C or higher and 550 ° C or lower.
- the tensile strength can be increased by 15% or more after low-temperature annealing.
- the improvement in tensile strength can be measured. That is, a heat-resistant spring having a tensile strength increase rate of 15% or more has a Cottrell atmosphere and is excellent in high-temperature set resistance.
- the low-temperature annealing is preferably performed at the above-mentioned temperature of 450 ° C. to 600 ° C. for 10 minutes to 60 minutes.
- a particularly preferred time is between 15 minutes and 30 minutes. It is known that the workability is improved when applying a Ni plating of about 1-3 ⁇ to the surface of a steel wire in drawing or spring-drawing a wire or wire that has been strengthened as described above. . In the present invention, even if such treatment is performed on the surface of the steel wire, it does not prevent the improvement of the heat resistance property, and is effective in improving the workability.
- C forms an interstitial solid solution in the crystal lattice and has the effect of strengthening by introducing strain. It also has the effect of forming a Cottrell atmosphere and fixing dislocations in the metal structure. Change In addition, it has the effect of increasing high-temperature strength by forming carbides by combining with Cr, Nb, Ti, etc. in steel. When fine precipitates are formed with Nb, Ti, etc., the suppression of the crystal grain size can also be expected, which is effective in improving the high-temperature resistance to set.
- Cr carbide is present at the crystal grain boundaries, the diffusion rate of Cr in the y-phase '(austenite) is low, so a Cr-deficient layer is formed around the grain boundaries, and the toughness and corrosion resistance decrease. happenss. This phenomenon can be suppressed by the addition of b and Ti. However, the presence of excessive elements such as Nb and Ti causes instability of the ⁇ phase (austenite). Therefore, the effective content of C is set to 0.01 to 0.08 mass%.
- ⁇ is an interstitial solid solution strengthening element and also an element forming the Cottrell atmosphere. It also has the effect of increasing high-temperature strength by forming nitrides by combining with Cr, Nb, Ti, etc. in steel. When fine precipitates are formed with Nb, Ti, etc., suppression of the crystal grain size can also be expected, and this is effective in improving high-temperature resistance.
- solid solution in ⁇ phase (austenite) has a limit, and large amount of addition (0.20 mass% or more, especially 0.25 mass / exceeds 0 ) dissolves and blowholes during fabrication. It is a factor of occurrence.
- N 0.18 to 0.25 mass%.
- Mn is used as a deoxidizing agent at the time of dissolving and refining. It is also effective in stabilizing the Y phase (austenite) of austenitic stainless steel, and can be an expensive alternative to M. Furthermore, as described above, it also has the effect of increasing the solid solubility limit of N in the ⁇ phase (austenite). However, since it has an adverse effect on the oxidation resistance at high temperatures,: ⁇ : 0.5 to 4.0 mass%. The content of Mn is 0.5 to 2.0 mass when corrosion resistance is particularly important. / 0 is preferred. On the other hand, in order to increase the solid solubility limit of N, that is, to minimize the micro blowhole of N, it is effective to add 2.0 to 4.0% by mass. However, in this case, the corrosion resistance is slightly reduced. Therefore, the amount of addition should be adjusted according to the application.
- Ni eq (%) is, for example, obtained from the Ni% + 0. 65Cr o / o + 0. 98Mo% + 1. 05Mn o / o + 0. 35Si% + 12. 6C%.
- Cr equivalent is, for example, Cr% 1.72Mo% + 2.09Si% + 4.86Nb% + 8.29V% + 1.77Ti% + 21.4Al% + 40B% -7.14C%-8.0N%
- Ni is effective in stabilizing the ⁇ phase (austenite).
- the ⁇ content when the ⁇ content is 0.2% by mass or more in the present invention, a large amount of Ni content causes blowholes.
- the addition of Mn, which has a high affinity for N, is effective, and it is necessary to add Ni in consideration of the amount of Mn to obtain an austenitic stainless steel. Therefore, the content was set to 8.0% by mass or more for stabilizing the ⁇ phase (austenite), and 10.5% by mass or less for suppressing blowholes and suppressing cost increase.
- Ni is preferably in the range of 8.0 to 0.5% by mass, but is preferably 10.0% by mass. /.
- N can be easily dissolved in the melting and manufacturing process, so that there is a great merit that the cost can be further reduced.
- the scope of the present invention is set forth in the scope of the present invention.
- the austenite stability is higher, such as SUS316, Ni: 10.0 to 14.0%, It is self-evident that the high temperature sag resistance obtained by the method can be obtained.
- Mo forms a substitutional solid solution in the y phase (austenite) and greatly contributes to the improvement of high temperature tensile strength and high temperature set resistance. Therefore, the minimum required for improving sag resistance is 0.1% by mass or more, and the lower limit is 3.0% by mass in consideration of deterioration in workability.
- Nb Like Mo, Nb also forms a solid solution in the ⁇ phase (austenite) and greatly contributes to the improvement of high-temperature tensile strength and high-temperature set resistance. Also, as described above, it has a high affinity for N and C, and contributes to the improvement of sag resistance at high temperatures by being finely precipitated in the ⁇ phase (austenite). In addition, it has the effect of suppressing the coarsening of the crystal grain size and the precipitation of Cr carbide at the grain boundary. However, if added excessively, an Fe 2 Nb (Lavas) phase will precipitate. At this time, it was 0.1 to 2.0 wt%, the strength deterioration is expected.
- Ti is a ferrite-forming element like Mo, Nb, and Si described below, and can improve heat resistance by forming a solid solution in the ⁇ phase (austenite).
- Ti for reducing the stability of the y-phase (O austenite), Ti: was 0.1 to 2 0 mass 0/0..
- Si is effective in improving heat resistance properties by forming a solid solution. Further, it is also effective as a deoxidizing agent at the time of dissolving and refining, and further requires 0.3% by mass or more to obtain heat resistance by solid solution strengthening.
- the content was set to 2.0% by mass or less.
- Co is a ⁇ phase (austenite) forming element, and although the effect of solid solution strengthening is not obtained as much as the ferrite forming elements such as Mo, b, Ti, and Si described above, it forms an intermetallic compound and causes precipitation strengthening. This effect significantly improves the heat resistance at high temperatures equivalent to the addition of the ferrite-forming element.
- a large amount of soybean curd reduced the acid resistance to sulfuric acid and nitric acid and the atmospheric corrosion resistance, so it was set to 0.2 to 2.0% by mass.
- FIG. 1 is an explanatory diagram of a test method for evaluating sag resistance of a steel wire.
- a steel material having the chemical components (% by mass) shown in Table 1 was melt-formed, forged, and then hot-rolled. After that, solid solution heat treatment and wire drawing (wire temperature during wire drawing: 50 to 200 ° C) were repeated, and finally a test piece with a wire reduction of about 60% and wire diameter of 3.0 mm Was prepared.
- Table 1 shows the chemical composition of the test piece, the maximum crystal grain size of the V phase (austenite), and the tensile strength.
- Comparative Material 1 is SUS304-WPB, which is a general heat-resistant stainless steel
- Comparative Material 2 is SUS316-WPA.
- the maximum crystal grain size of the ⁇ phase (austenite) was measured by photoetching with an optical microscope after performing cross-sectional etching of a steel wire.
- Inventive materials 1 to 7 and comparative materials 1 to 3 were prepared by changing the maximum crystal grain size of the ⁇ phase (austenite). It was set. The holding time / diameter of the steel wire was 0.3 min / rara to 3.5 min / ram, and an appropriate one was set according to each test piece. In addition, in the above-mentioned range of the temperature and the holding time, as shown in Table 1, almost no difference in the crystal grain size due to the difference in the chemical components was observed.
- the comparative material II had a longer holding time at a temperature higher than the solution heat treatment temperature.
- the surface roughness in the drawing direction was set to 20111 or less in Rz by the conventional process management such as the configuration of the dies and the drawing speed, and the handling of steel wires during heat treatment.
- the surface roughness in the drawing direction of the inventive materials 1 to 7 and the comparative examples 1 to 4 was about 15 m in Rz.
- test specimens shown in Table 1 were evaluated for sag resistance at high temperatures. Each specimen was processed into a compression coil spring shape, and then subjected to a low-temperature annealing test. The condition of the low-temperature annealing in each test piece was 450 ° C. ⁇ 20tnin. The coil spring used for the test is shown below. All the test pieces were evaluated with Ni plating of about 2 ⁇ on the surface.
- the test method was as follows: First, the test piece was made into a coil spring 1, a compressive load was applied at room temperature (load shear stress: 500 MPa), and the test temperature was 400 ° C for 24 hours at a constant strain. .Hold. After that, the load was released at room temperature, and the residual shear strain was determined by measuring the amount of set of the spring. The results are shown in Table 2.
- the residual shear strain (%) is obtained by the following formula.
- Residual shear strain (%) 8 / ⁇ X (P1-P2) XD / (GX d 3 ) X 100
- d (j) wire diameter.
- D (mm) average diameter of coil (see Fig. 1)
- Displacement a (mm): Displacement of coil spring when P1 is applied before 400 ° C test (see Fig. 1)
- G Transverse elastic modulus
- P1 and P2 shall be measured at room temperature.
- the residual shear strain (%) shown in Table 2 is the value after the test. The smaller the value of the residual shear strain, the higher the high-temperature sag resistance. This is the same in the test examples described later.
- Comparative Examples 3 and y-phase (austenite) of Invention Materials 1 to 7 all contain less than 0.18 mass% of Comparative Material 1 and Comparative Material 2, which are general heat-resistant stainless steels. It can be seen that the residual shear strain is smaller than that of Comparative Example 4 in which the maximum crystal grain size of) exceeds 12 ra. That is, it can be confirmed that the invented material has high resistance to high-temperature sag and very excellent heat resistance.
- the surface roughness of the steel wire in the drawing direction was changed in a test piece prepared in the same manner with the same chemical composition as that of Inventive material 1 shown in Table 1, and after performing spring processing as in Test example 1, low-temperature annealing was performed. High temperature sag resistance was evaluated for each of the resulting samples.
- Inventive material 8 is one in which the surface of a steel wire is smoothed by electropolishing.
- Comparative material 5 is a steel wire whose surface is exposed using sandpaper (# 120). Note that the tensile strength was measured by the above-described tensile test at room temperature. The test for sag resistance at high temperature was performed in the same manner as in Test Example 1. The results are shown in Table 3.
- Table 3 shows the tensile strength before and after the low-temperature annealing, the rate of increase in strength, and the residual shear strain after the test. As shown in Table 3, it was confirmed that the smaller the surface roughness in the drawing direction of the steel wire, the smaller the residual shear strain and the better the high-temperature sag resistance. Further, a more detailed examination confirmed that the surface roughness exhibited better high-temperature sag resistance when the surface roughness was 20 Aim or less at Rz.
- the annealing temperature was changed to 400 ° C, 450 ° C, 500 ° C, 550 ° C, 600 ° C, and 650 ° C.
- the samples subjected to low-temperature annealing were evaluated for high-temperature sag resistance.
- Invention material 9 had an annealing temperature of 400 ° C
- invention material 10 had the same 500 ° C
- invention material 11 had the same 550 ° C
- invention material 12 had the same 600 ° C
- invention material 13 had the same 650 ° C. Things.
- the test was performed in the same manner as in Test Example 1. Table 4 shows the results.
- Invention material 9 400 20 1652 1812 9.7 0.073 Invention material 1 450 20 1652 1855 12.3 0.062 Invention material 10 500 20 1652 1911 15.7 0.048 Invention material 11 550 20 1652 1903 15.2 0.052 Invention material 12 600 20 1652 1839 ⁇ .3 0.058 Invention material 13 650 20 1729 1919 11.0 0.068
- Table 4 shows the tensile strength before and after the low-temperature annealing, the rate of increase in strength, and the residual shear strain after the test.
- invention material 1 with an annealing temperature of 450 ° C to 600 ° C and 10 to 10; L2 has smaller residual shear strain and shows excellent high-temperature resistance. did it.
- Invention Materials 10 and 11 which showed an increase rate of tensile strength of 15% or more at an annealing temperature of 500 ° C to 550 ° C, exhibited better high-temperature sag resistance.
- Test pieces with irregular cross-sections such as rectangles and rectangles made of the same chemical components as the test pieces shown in Table 1 and subjected to spring processing and low-temperature annealing as in Test Example 1 The settability was evaluated. As a result, as in Test Example 1, it was confirmed that the invented material had better high-temperature sag resistance than the comparative material.
- Test specimens having the same chemical components as the test specimens shown in Table 1 were prepared with different tensile strengths by changing the conditions for solution heat treatment, the reduction in the area of wire drawing, and the wire temperature during wire drawing.
- One is to reduce the area reduction rate to less than about 60% and suppress the occurrence of strain aging by suppressing the wire temperature during drawing to a low value, and the tensile strength is set to about 1350 N / mm 2 .
- the crystal grain size was made similar to that of the test piece obtained in Test Example 1 by lowering the solution heat treatment temperature.
- the area reduction rate was more than about 60%, and the wire temperature during drawing was increased to 180 ° C to accelerate the occurrence of strain aging, and the tensile strength was increased to 1950 N / ram. It was about 2 .
- the crystal grain size was made similar to that of the test piece obtained in Test Example 1.
- Tensile strength was measured by a tensile test in a room similarly to the above. These test pieces were subjected to spring annealing in the same manner as in Test Example 1, and then subjected to low-temperature annealing. Was evaluated. As a result, the same tendency as the result of Test Example 1 was shown.
- the steel wire for heat-resistant springs of the present invention controls the structure of the ⁇ -phase (austenite) by adding a relatively large amount of N to austenitic stainless steel, which is a Fe-based alloy.
- Solid-solution strengthening with interstitial solid-solution elements and ferrite-forming elements such as Mo, b, Ti, and Si enables high-temperature tensile strength in the high-temperature range from 350 ° C to 500 ° C, especially around 400 ° C. And high temperature sag resistance.
- by reducing the stacking fault energy by adding Co and forming a Cottrell atmosphere by heat treatment it is possible to obtain better heat resistance at lower cost than general heat-resistant stainless steels such as SUS304 and SUS316. is there.
- the steel wire for a heat-resistant spring of the present invention is a solid solution strengthened alloy, the yield is better than that of a precipitation strengthened alloy, the increase in cost can be reduced, and the industrial value is high.
- the steel wire for heat-resistant springs of the present invention reduces surface roughness, thereby reducing stress concentration after spring processing and suppressing the occurrence of local sag. Therefore, it can have excellent heat resistance.
- the steel wire for heat-resistant springs of the present invention is excellent in high-temperature set resistance, particularly at about 400 ° C, and is used for ball joints, blades, and three-way catalysts, which are flexible joint parts used in automobile exhaust systems. It is best used for heat-resistant spring materials such as knit mesh used.
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB028075528A CN1312309C (zh) | 2002-01-24 | 2002-01-24 | 耐热弹簧用钢丝、耐热弹簧和制造耐热弹簧的方法 |
KR1020037012467A KR100606106B1 (ko) | 2002-01-24 | 2002-01-24 | 내열 스프링용강선, 내열 스프링 및 내열 스프링의 제조방법 |
TW091101166A TWI266806B (en) | 2002-01-24 | 2002-01-24 | Steel site for thermal-resistant springs, thermal-resistant spring and manufacturing method thereof |
DE60239830T DE60239830D1 (de) | 2002-01-24 | 2002-01-24 | Verfahren zur herstellung einer hitzebeständigen stahlfeder |
EP02716370A EP1469093B1 (en) | 2002-01-24 | 2002-01-24 | Method for producing a heat-resistant steel spring |
US10/473,355 US7404865B2 (en) | 2002-01-24 | 2002-01-24 | Steel wire for heat-resistant spring, heat-resistant spring and method for producing heat-resistant spring |
PCT/JP2002/000525 WO2003062483A1 (fr) | 2002-01-24 | 2002-01-24 | Fil d'acier pour ressorts thermoresistants, ressorts thermoresistants, et procede de production de ressorts thermoresistants |
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PCT/JP2002/000525 WO2003062483A1 (fr) | 2002-01-24 | 2002-01-24 | Fil d'acier pour ressorts thermoresistants, ressorts thermoresistants, et procede de production de ressorts thermoresistants |
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PCT/JP2002/000525 WO2003062483A1 (fr) | 2002-01-24 | 2002-01-24 | Fil d'acier pour ressorts thermoresistants, ressorts thermoresistants, et procede de production de ressorts thermoresistants |
Country Status (7)
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US (1) | US7404865B2 (ja) |
EP (1) | EP1469093B1 (ja) |
KR (1) | KR100606106B1 (ja) |
CN (1) | CN1312309C (ja) |
DE (1) | DE60239830D1 (ja) |
TW (1) | TWI266806B (ja) |
WO (1) | WO2003062483A1 (ja) |
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JP4245457B2 (ja) * | 2003-10-29 | 2009-03-25 | 住友電工スチールワイヤー株式会社 | ステンレス鋼線、ばね、及びばねの製造方法 |
RU2397006C2 (ru) * | 2005-07-01 | 2010-08-20 | Хеганес Аб | Нержавеющая сталь для применения в фильтрах |
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JP4310359B2 (ja) * | 2006-10-31 | 2009-08-05 | 株式会社神戸製鋼所 | 疲労特性と伸線性に優れた硬引きばね用鋼線 |
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JP5756410B2 (ja) | 2010-01-18 | 2015-07-29 | 中央発條株式会社 | ばね特性修正方法及びばね特性修正装置 |
CN101775551A (zh) * | 2010-03-09 | 2010-07-14 | 江苏亚盛金属制品有限公司 | 一种新型耐海水腐蚀不锈钢及其钢丝绳制造方法 |
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CN106148849A (zh) * | 2015-03-23 | 2016-11-23 | 江苏锦明不锈钢新材料有限公司 | 一种高强度不锈钢 |
CN105441800A (zh) * | 2015-11-26 | 2016-03-30 | 铜陵市大明玛钢有限责任公司 | 高硬度高韧性纳米晶合金轧辊 |
CN105463342B (zh) * | 2015-12-03 | 2017-10-27 | 浙江腾龙精线有限公司 | 一种编织线的制造方法 |
JP6583082B2 (ja) * | 2016-03-22 | 2019-10-02 | 住友電気工業株式会社 | ばね用鋼線 |
CN111684095B (zh) * | 2018-02-01 | 2021-12-10 | 住友电气工业株式会社 | 覆铜钢线和斜圈弹簧 |
CN109136771A (zh) * | 2018-10-19 | 2019-01-04 | 太原钢铁(集团)有限公司 | 奥氏体不锈钢及其制备方法 |
CN109490302A (zh) * | 2018-11-11 | 2019-03-19 | 上海电气上重铸锻有限公司 | 一种核电用钢马氏体组织的奥氏体晶粒的测试方法 |
CN110699618B (zh) * | 2019-11-22 | 2021-07-20 | 沈阳航天新光集团有限公司 | 一种高强合金弹簧弹力稳定化热处理方法 |
CN111172454A (zh) * | 2019-12-31 | 2020-05-19 | 江苏新华合金有限公司 | 314耐热钢丝及其制备方法 |
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- 2002-01-24 TW TW091101166A patent/TWI266806B/zh not_active IP Right Cessation
- 2002-01-24 CN CNB028075528A patent/CN1312309C/zh not_active Expired - Fee Related
- 2002-01-24 DE DE60239830T patent/DE60239830D1/de not_active Expired - Lifetime
- 2002-01-24 KR KR1020037012467A patent/KR100606106B1/ko active IP Right Grant
- 2002-01-24 WO PCT/JP2002/000525 patent/WO2003062483A1/ja active Application Filing
- 2002-01-24 EP EP02716370A patent/EP1469093B1/en not_active Expired - Lifetime
- 2002-01-24 US US10/473,355 patent/US7404865B2/en not_active Expired - Lifetime
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Also Published As
Publication number | Publication date |
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KR100606106B1 (ko) | 2006-07-28 |
EP1469093A1 (en) | 2004-10-20 |
EP1469093B1 (en) | 2011-04-20 |
EP1469093A4 (en) | 2005-03-23 |
KR20040067868A (ko) | 2004-07-30 |
CN1671874A (zh) | 2005-09-21 |
US7404865B2 (en) | 2008-07-29 |
DE60239830D1 (de) | 2011-06-01 |
TWI266806B (en) | 2006-11-21 |
CN1312309C (zh) | 2007-04-25 |
US20040099354A1 (en) | 2004-05-27 |
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