WO2024014484A1 - 低熱膨張合金 - Google Patents
低熱膨張合金 Download PDFInfo
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- WO2024014484A1 WO2024014484A1 PCT/JP2023/025751 JP2023025751W WO2024014484A1 WO 2024014484 A1 WO2024014484 A1 WO 2024014484A1 JP 2023025751 W JP2023025751 W JP 2023025751W WO 2024014484 A1 WO2024014484 A1 WO 2024014484A1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
-
- 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
- C21D6/001—Heat treatment of ferrous alloys containing Ni
-
- 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
- C21D6/007—Heat treatment of ferrous alloys containing Co
-
- 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
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
Definitions
- the present invention relates to a low thermal expansion alloy, and particularly to a low thermal expansion alloy with excellent machinability.
- Thermally stable invar alloys are widely used as component materials for electronics and semiconductor-related equipment, laser processing machines, and ultra-precision processing equipment.
- conventional invar alloys have had a problem in that their practical use has been limited to quite narrow fields due to their low machinability.
- Patent Document 1 discloses, as a means to solve this problem, that S is used as a free-cutting element, C: 0.05% or less, Si: 0.3% or less, Mn: 0.45 to 1. 2%, P: 0.5% or less, S: 0.015 to 0.035%, Ni: 33.0 to 34.5%, Co: 3.0 to 4.0%, with the remainder being substantially is made of iron, and when [Mn] is the weight% of Mn and [S] is the weight% of S, the average thermal expansion at room temperature is [Mn]/[S]: 15 or more.
- a low thermal expansion alloy with excellent machinability and a coefficient of thermal expansion of 1.0 ⁇ 10 -6 /°C or less is disclosed.
- Patent Document 2 discloses a cast iron having a graphite structure in an austenitic base iron using C as a free-cutting element, and contains 0.09% or more of solid solution carbon and 0.43% or less of silicon in weight percent. Low thermal expansion with less than 0% nickel, 29% to 34% nickel, 4% to 8% cobalt, balance iron, and a coefficient of thermal expansion of 4 x 10 -6 /°C or less in the temperature range of 0 to 200°C. Discloses cast iron.
- Patent Document 3 discloses carbon 0.8 to 3.0%, silicon 1.0 to 3.0%, manganese 0.4 to 2.0%, and nickel 30.0 to 33%, using C as a free-cutting element. Discloses a cast iron characterized by containing 4.0 to 6.0% cobalt.
- Alloys used for component parts of precision equipment are required to have excellent machinability from the viewpoint of ease of processing.
- the machinability of alloys with low coefficients of thermal expansion leaves room for further improvement.
- the present inventors have intensively studied a method for obtaining a low thermal expansion alloy with further improved machinability. As a result, it was found that by appropriately controlling the contents of Si, Mn, S, Ni, and Co, a low thermal expansion alloy with a small coefficient of thermal expansion and excellent machinability can be obtained.
- the present invention was made based on the above findings, and the gist thereof is as follows.
- a low thermal expansion alloy with excellent machinability can be obtained, so that it can be easily processed into components of precision equipment, for example.
- FIG. 1 is a diagram illustrating evaluation of tool wear amount in Examples.
- FIG. 2 is a diagram illustrating evaluation of chip friability in Examples.
- C is an element that crystallizes as graphite in castings and improves machinability, but it is also an element that increases the coefficient of thermal expansion.
- the amount of C is set to 0.050% or less in order to suppress an increase in the coefficient of thermal expansion.
- it is 0.040% or less, more preferably 0.030% or less, still more preferably 0.020% or less.
- Si 0.30-1.00%
- Si is an element that improves machinability when combined with S. Since the thermal expansion coefficient increases as the Si content increases, the Si content is set to 0.30 to 1.00% in consideration of the balance between machinability and thermal expansion coefficient.
- the lower limit of the amount of Si may be 0.40% or 0.50%.
- the upper limit of the amount of Si may be 0.90% or 0.80%.
- Mn 0.50-2.00%
- Mn is an element that forms a compound with S and improves machinability. It is also an element that suppresses cracking during casting and forging. Since the thermal expansion coefficient increases as the Mn content increases, the Mn content is set to 0.50 to 2.00% in consideration of the balance between machinability and thermal expansion coefficient.
- the lower limit of the Mn amount may be 0.60%, 0.70%, or 0.80%.
- the upper limit of the Mn amount may be 1.90%, 1.80%, or 1.70%.
- S 0.030-0.150%
- S is an element that forms a compound with Mn and improves machinability.
- the amount of S increases, S segregates at grain boundaries, making the alloy brittle, and cracks are more likely to occur during casting and forging.
- the amount of S is set to 0. 0.030 to 0.150%.
- the lower limit of the amount of S may be 0.040%, 0.050%, or 0.060%.
- the upper limit of the S amount may be 0.140%, 0.130%, or 0.120%.
- Ni is an element that lowers the coefficient of thermal expansion.
- the low thermal expansion alloy of the present invention has an average coefficient of thermal expansion of 3.0 ⁇ 10 -6 /°C or less between 25 and 100°C. This coefficient of thermal expansion is mainly obtained by adjusting the contents of Ni and Co within appropriate ranges. If the amount of Ni is too large or too small, the coefficient of thermal expansion will not become sufficiently small. In order to make the coefficient of thermal expansion sufficiently small, the amount of Ni is set to 27.00 to 38.00%.
- the lower limit of the Ni content may be 28.00%, 29.00%, or 30.00%.
- the upper limit of the Ni amount may be 37.00%, 36.00%, or 35.00%.
- Co contributes to lowering the coefficient of thermal expansion in combination with Ni.
- the Co content may be zero.
- the range of Co is 0 to 12.00%.
- the upper limit of the Co amount may be 11.00%, 10.00%, or 8.00%.
- sol.Al 0.003-0.100%
- Al is an element that improves machinability. Since it is also an element that increases the coefficient of thermal expansion, considering the balance between machinability and coefficient of thermal expansion, sol.
- the amount of Al is 0.003 to 0.100%.
- sol. Al refers to acid-soluble Al that is not in the form of an oxide such as Al 2 O 3 and is soluble in acid. sol.
- the Al content is determined as Al measured by subtracting the undissolved residue on the filter paper generated during the Al analysis process. sol.
- the lower limit of the amount of Al may be 0.010%, 0.020%, or 0.030%. sol.
- the upper limit of the amount of Al may be 0.090%, 0.080%, or 0.070%.
- O is an element contained as an impurity and is not an essential element, and the lower limit is 0.
- O When O combines with Al, it forms alumina. Alumina is hard and accelerates tool wear. Furthermore, due to the formation of alumina, sol. The amount of Al decreases and machinability decreases. Therefore, the amount of O is set to 0.010% or less. Preferably it is 0.008% or less, more preferably 0.007% or less, even more preferably 0.006% or less.
- the remainder of the component composition is Fe and impurities.
- impurities refers to elements that are unavoidably mixed in from raw materials, the manufacturing environment, etc. during the industrial production of castings having the composition specified in the present invention, and are elements other than those mentioned above that are mixed in. However, it does not impair the machinability and coefficient of thermal expansion of the low thermal expansion alloy of the present invention.
- P is 0.050% or less.
- the low thermal expansion alloy of the present invention further has the following content of [Mn], [S], [Ni], [Co], and [Si] expressed in mass %. satisfies the formula.
- [Mn]/[S] is set to 10.0 or more so that S sufficiently forms a compound with Mn and improves machinability. Preferably it is 15.0 or more, more preferably 20.0 or more, still more preferably 30.0 or more.
- a small [Mn]/[S] means that the amount of S is relatively large compared to the amount of Mn, which increases the amount of S that segregates at grain boundaries, making it easier for cracks to occur during casting and forging. there is a possibility.
- Ni and Co are elements that reduce the coefficient of thermal expansion, but by optimizing their combination, the coefficient of thermal expansion can be further reduced, reducing [Ni] + 0.4 [Co] to 32.0 ⁇ 38.0%.
- the lower limit of [Ni]+0.4[Co] is preferably 32.5%, more preferably 33.0%.
- the upper limit of [Ni]+0.4[Co] is preferably 37.0%, more preferably 36.0%, and still more preferably 35.0%.
- Si and Mn are elements that improve machinability, but since they increase the coefficient of thermal expansion, the total amount is set to 2.50% or less. Preferably it is 2.30% or less, more preferably 2.00% or less.
- the low thermal expansion alloy of the present invention has an average coefficient of thermal expansion of 3.0 ⁇ 10 -6 /°C or less between 25 and 100°C. As mentioned above, this coefficient of thermal expansion is mainly obtained by adjusting the Ni and Co contents within appropriate ranges.
- the average coefficient of thermal expansion from 25 to 100°C is 2.80 ⁇ 10 -6 /°C or less, 2.60 ⁇ 10 -6 /°C or less, 2.40 ⁇ 10 -6 /°C or less, 2.20 ⁇ 10 - 6 /°C or less, 2.00 ⁇ 10 -6 /°C or less, or 1.80 ⁇ 10 -6 /°C or less.
- the thermal expansion coefficient is measured using a thermal expansion measuring device in the range of -1 to 130°C at a heating rate of 3°C/min.
- a thermal expansion measuring device TD5030S manufactured by BRUKER can be used.
- the low thermal expansion alloy of the present invention is (1) Melt and solidify raw materials adjusted to the desired composition to produce cast products, (2) The obtained cast product is subjected to solution treatment, (3) Manufactured by a manufacturing method that includes a step of applying stress relief annealing to a cast product that has been subjected to solution treatment.
- the cast product obtained by the above manufacturing method may be forged to produce a forged product.
- Forging is performed after producing the cast alloy and before solution treatment. That is, the low thermal expansion alloy of the present invention is produced by: (1) melting and solidifying raw materials adjusted to have a desired composition to produce a cast product; (2) Forging the obtained cast product, (3) Solution treatment is applied to the forged product after forging, (4)
- the forged product may be manufactured by a manufacturing method that includes a step of applying stress relief annealing to a forged product that has been subjected to solution treatment.
- the mold used for manufacturing the cast product, the device and method for injecting the molten alloy into the mold are not particularly limited, and any known device or method may be used.
- the cast product is heated to 750 to 850°C, maintained for 0.5 to 3 hr, and then rapidly cooled.
- the cooling rate is preferably 10°C/min or more, more preferably 100°C/min or more. Solution treatment can reduce the coefficient of thermal expansion.
- Stress relief annealing is carried out at 300 to 350°C for 1 to 5 hours, followed by air cooling.
- Solution treatment and stress relief annealing may be performed after forging instead of after casting.
- the cast product When forging a cast product, the cast product is heated to 1050 to 1250°C in a heating furnace, and then hot forged.
- the training ratio at that time is preferably 3 or more. Even when subjected to hot forging, the low thermal expansion characteristics of the low thermal expansion alloy of the present invention are substantially maintained. Further, it is also possible to process the film to a thickness of 0.1 to 10 mm by hot rolling and cold rolling. Even in that case, the low thermal expansion characteristics are almost maintained.
- the alloy has the composition of the present invention, as described above, it is possible to obtain a low thermal expansion alloy with excellent machinability without using any special manufacturing method.
- the low thermal expansion alloy of the present invention By processing the low thermal expansion alloy of the present invention (including cast products and forged products), alloy parts used for, for example, electronics and semiconductor-related equipment, laser processing machines, and ultra-precision processing equipment can be obtained.
- the low thermal expansion alloy of the present invention is thermally stable and has excellent machinability, so it is suitable as a material for alloy parts.
- a cast product (Y-shaped sample material and 10 kg of ingot) adjusted to have the composition shown in Table 1 was melted.
- the obtained ingots were heated to 1200°C in a heating furnace and then hot forged to produce forged products (40 mm square bars). did.
- the training ratio was set to 5 or higher.
- the obtained cast products and forged products were each subjected to solution treatment by heating to 800°C and holding for 1.5 hours, and after the solution treatment, stress annealing treatment was performed by holding at 300°C for 3 hours and air cooling. did.
- test piece for measuring the coefficient of thermal expansion and a test piece for evaluating machinability were taken from each of the cast and forged products after stress annealing treatment.
- the thermal expansion coefficient was measured using a thermal expansion measuring device (BRUKER TD5030S) in the range of -1 to 130°C at a heating rate of 3°C/min, and the average thermal expansion coefficient from 25°C to 100°C was determined. I asked for
- test pieces for machinability evaluation were prepared using a drill with a drill diameter of ⁇ 2.6 mm (cobalt HSS, TiN coating), water-soluble cutting fluid, and cutting speed: Drilling to a depth of 13 mm (non-step machining) was performed at a feed rate of 45 m/min and a feed rate of 0.052 mm/min for evaluation.
- Machinability was evaluated by tool wear amount and chip crushability.
- the amount of tool wear will be explained with reference to FIG. Regarding the amount of tool wear, for the drill after drilling 100 holes, as shown in Figure 1, the distance from the point where the base material of the drill is visible (1) to the cutting edge (2), and the amount of tool wear is 0.05 mm or less. In this case, it was judged as being good. Note that “drilling not possible” in Table 2 indicates that the drill was found to be broken or missing, or abnormal noises were generated during drilling, and it was determined that drilling was not possible. Furthermore, in the examples described as "forging cracks,” cracks occurred during forging, so evaluations of thermal expansion coefficient, tool wear amount, and chip crushability were not performed.
- FIG. 2 shows an example in which the chip breakability is good
- FIG. 2(b) shows an example in which the chip breakability is poor
- "x elongation" in Table 2 means that more than 20% of the chips were chipped and the length exceeded 1 cm.
- No. Nos. 1 to 14 are invention examples, which have a small coefficient of thermal expansion, good tool wear and chip crushability, and the low thermal expansion alloy of the present invention has good machinability for both cast and forged products. This was confirmed.
- No. No. 15 had a small amount of Si and a large amount of tool wear.
- No. No. 16 had a large amount of Si, and also had a large [Si]+[Mn], and a large coefficient of thermal expansion.
- Sample No. 17 had a small amount of Mn, and also had a small [Mn]/[S], and suffered from forging cracks.
- No. No. 18 had a large amount of Mn, and also had a large [Si]+[Mn], and a large thermal expansion coefficient.
- Sample No. 19 had a small amount of S, a large amount of tool wear, and poor chip breakability.
- No. No. 20 had a large amount of S and also had a small [Mn]/[S] ratio, and forging cracks occurred.
- No. No. 21 had a small amount of Ni and a large coefficient of thermal expansion.
- No. No. 22 had a large amount of Ni and a large coefficient of thermal expansion.
- No. No. 23 had a large amount of Co and a large coefficient of thermal expansion.
- No. 24 is sol.
- the amount of Al was small and the amount of O was also large, resulting in a large amount of tool wear.
- No. No. 26 had a small [Ni]+0.4[Co] and a large coefficient of thermal expansion.
- No. No. 28 had a large [Si]+[Mn] and a large coefficient of thermal expansion.
- Samples Nos. 29 to 33 had low amounts of Si, Mn, and S, had a large amount of tool wear, and had poor chip breakability.
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Abstract
Description
Cは鋳物中に黒鉛として晶出し被削性を高める元素であるが、熱膨張係数を増加させる元素でもある。本発明の低熱膨張合金においては、熱膨張係数の増加を抑えるため、C量は0.050%以下とする。好ましくは0.040%以下、より好ましくは0.030%以下、さらに好ましくは0.020%以下である。
Siは、Sと複合することにより、被削性を向上させる元素である。Siの含有量が多くなると熱膨張係数が増加するため、被削性と熱膨張係数のバランスを考慮し、Si量は0.30~1.00%とする。Si量の下限は、0.40%、0.50%としてもよい。Si量の上限は、0.90%、0.80%としてもよい。
Mnは、Sと化合物を形成し、被削性を向上させる元素である。また、鋳造、鍛造時の割れを抑制する元素でもある。Mnの含有量が多くなると熱膨張係数が増加するため、被削性と熱膨張係数のバランスを考慮し、Mn量は0.50~2.00%とする。Mn量の下限は、0.60%、0.70%、0.80%としてもよい。Mn量の上限は、1.90%、1.80%、1.70%としてもよい。
Sは、Mnと化合物を形成し、被削性を向上させる元素である。S量が多くなると、Sが粒界に偏析することで合金が脆化し、鋳造、鍛造時に割れが生じやすくなるので、被削性と合金の脆化のバランスを考慮し、S量は0.030~0.150%とする。S量の下限は、0.040%、0.050%、0.060%としてもよい。S量の上限は、0.140%、0.130%、0.120%としてもよい。
Niは、熱膨張係数を低下させる元素である。本発明の低熱膨張合金は、25~100℃の平均熱膨張係数が3.0×10-6/℃以下である。この熱膨張係数は、主として、Ni及びCoの含有量を適切な範囲とすることで得られる。Ni量は多すぎても少なすぎても熱膨張係数が十分に小さくならない。熱膨張係数を十分に小さくするために、Ni量は27.00~38.00%とする。Ni量の下限は、28.00%、29.00%、30.00%としてもよい。Ni量の上限は、37.00%、36.00%、35.00%としてもよい。
Coは、Niとの組み合わせにより熱膨張係数の低下に寄与する。Coの含有量は0であってもよい。所望の熱膨張係数を得るため、Coの範囲は0~12.00%とする。Co量の上限は、11.00%、10.00%、8.00%としてもよい。
sol.Alは、被削性を向上させる元素である。熱膨張係数を増加させる元素でもあるので、被削性と熱膨張係数のバランスを考慮し、sol.Al量は0.003~0.100%とする。ここで、sol.Alとは、Al2O3等の酸化物になっておらず、酸に可溶する酸可溶Alを意味する。sol.Alの含有量は、Alの分析過程で生じるろ紙上の不溶解残渣を控除して測定したAlとして求められる。sol.Al量の下限は、0.010%、0.020%、0.030%としてもよい。sol.Al量の上限は、0.090%、0.080%、0.070%としてもよい。
Oは不純物として含有される元素であり、必須の元素ではなく、下限は0である。OはAlと結合するとアルミナを形成する。アルミナは硬いため、工具の摩耗を促進する。また、アルミナが形成することにより、sol.Al量が減少し、被削性が低下する。そのためO量は0.010%以下とする。好ましくは、0.008%以下、より好ましくは0.007%以下、さらに好ましくは0.006%以下である。
[Mn]/[S]は、SがMnと十分に化合物を形成し、被削性を向上させるため10.0以上とする。好ましくは15.0以上、より好ましくは20.0以上、さらに好ましくは30.0以上である。[Mn]/[S]が小さいことは、S量がMn量に対して相対的に大きいことを意味し、Sが粒界に偏析する量が増えるため、鋳造、鍛造時に割れが生じやすくなる可能性がある。
NiとCoは、ともに熱膨張係数を低下させる元素であるが、その組み合わせを最適化することで、熱膨張係数をより低下させることができ、[Ni]+0.4[Co]を32.0~38.0%とする。[Ni]+0.4[Co]の下限は、好ましくは32.5%、より好ましくは33.0%である。[Ni]+0.4[Co]の上限は、好ましくは37.0%、より好ましくは36.0%、さらに好ましくは35.0%である。
SiとMnは、ともに被削性を向上させる元素であるが、熱膨張係数を増加させるので、合計量を2.50%以下とする。好ましくは2.30%以下、より好ましくは2.00%以下である。
本発明の低熱膨張合金は、25~100℃の平均熱膨張係数が3.0×10-6/℃以下である。上述のとおり、この熱膨張係数は、主として、Ni及びCoの含有量を適切な範囲とすることで得られる。25~100℃の平均熱膨張係数は、2.80×10-6/℃以下、2.60×10-6/℃以下、2.40×10-6/℃以下、2.20×10-6/℃以下、2.00×10-6/℃以下、1.80×10-6/℃以下であってよい。
(1)所望の成分組成となるように調整した原料を溶融、凝固させ、鋳造品を製造し、
(2)得られた鋳造品に、溶体化処理を施し、
(3)溶体化処理を施した鋳造品に、応力除去焼きなましを施す
工程を備える製造方法により、製造される。
(1)所望の成分組成となるように調整した原料を溶融、凝固させ、鋳造品を製造し、
(2)得られた鋳造品に、鍛造を施し、
(3)鍛造後の鍛造品に、溶体化処理を施し、
(4)溶体化処理を施した鍛造品に、応力除去焼きなましを施す
工程を備える製造方法により製造されてもよい。
2 切れ刃
Claims (1)
- 質量%で、
C :0.050%以下、
Si:0.30~1.00%、
Mn:0.50~2.00%、
S :0.030~0.150%、
Ni:27.00~38.00%、
Co:0~12.00%、
sol.Al:0.003~0.100%、
O :0.010%以下
を含有し、残部がFe及び不純物であり、
Mn、S、Ni、Co、Siの含有量を質量%で表した[Mn]、[S]、[Ni]、[Co]、[Si]が、
[Mn]/[S]≧10.0、
32.0%≦[Ni]+0.4[Co]≦38.0%、
[Si]+[Mn]≦2.50%
を満たし、
25~100℃における平均熱膨張係数が3.0×10-6/℃以下である
ことを特徴とする低熱膨張合金。
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| WO2024214777A1 (ja) * | 2023-04-13 | 2024-10-17 | 新報国マテリアル株式会社 | 低熱膨張合金 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001262277A (ja) * | 2000-03-17 | 2001-09-26 | Nippon Chuzo Kk | 被削性に優れた低熱膨張合金およびその製造方法 |
| JP2003286546A (ja) * | 2002-03-28 | 2003-10-10 | Nippon Chuzo Kk | 常温での硬度および強度に優れた鋳造時の割れ感受性が小さい低熱膨張鋳造合金 |
| JP2012530001A (ja) * | 2009-06-11 | 2012-11-29 | フォード モーター カンパニー | テクスチャ面を具える低熱膨張係数のスラッシュ金型、その製造方法、及びその使用方法 |
| JP2018145491A (ja) * | 2017-03-07 | 2018-09-20 | 新報国製鉄株式会社 | 低熱膨張合金 |
| JP2018165380A (ja) * | 2017-03-28 | 2018-10-25 | 新報国製鉄株式会社 | 低熱膨張合金 |
| JP2019065344A (ja) * | 2017-09-29 | 2019-04-25 | 新報国製鉄株式会社 | 低熱膨張合金 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6051547B2 (ja) | 1982-05-29 | 1985-11-14 | 新一 榎本 | 低熱膨張鋳鉄 |
| JP2568022B2 (ja) | 1988-11-02 | 1996-12-25 | 株式会社東芝 | 低熱膨張鋳鉄を用いた工作機械、精密測定機器、成形用金型、半導体装置および電子製造装置 |
-
2023
- 2023-07-12 WO PCT/JP2023/025751 patent/WO2024014484A1/ja not_active Ceased
- 2023-07-12 KR KR1020257000184A patent/KR20250012714A/ko active Pending
- 2023-07-12 TW TW112126068A patent/TW202405200A/zh unknown
- 2023-07-12 JP JP2024533737A patent/JP7776181B2/ja active Active
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001262277A (ja) * | 2000-03-17 | 2001-09-26 | Nippon Chuzo Kk | 被削性に優れた低熱膨張合金およびその製造方法 |
| JP2003286546A (ja) * | 2002-03-28 | 2003-10-10 | Nippon Chuzo Kk | 常温での硬度および強度に優れた鋳造時の割れ感受性が小さい低熱膨張鋳造合金 |
| JP2012530001A (ja) * | 2009-06-11 | 2012-11-29 | フォード モーター カンパニー | テクスチャ面を具える低熱膨張係数のスラッシュ金型、その製造方法、及びその使用方法 |
| JP2018145491A (ja) * | 2017-03-07 | 2018-09-20 | 新報国製鉄株式会社 | 低熱膨張合金 |
| JP2018165380A (ja) * | 2017-03-28 | 2018-10-25 | 新報国製鉄株式会社 | 低熱膨張合金 |
| JP2019065344A (ja) * | 2017-09-29 | 2019-04-25 | 新報国製鉄株式会社 | 低熱膨張合金 |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024214777A1 (ja) * | 2023-04-13 | 2024-10-17 | 新報国マテリアル株式会社 | 低熱膨張合金 |
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| JPWO2024014484A1 (ja) | 2024-01-18 |
| JP7776181B2 (ja) | 2025-11-26 |
| EP4556589A4 (en) | 2026-03-11 |
| EP4556589A1 (en) | 2025-05-21 |
| KR20250012714A (ko) | 2025-01-24 |
| TW202405200A (zh) | 2024-02-01 |
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