JP2010138455A - Stainless steel sintered compact and manufacturing method thereof - Google Patents
Stainless steel sintered compact and manufacturing method thereof Download PDFInfo
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 239000010935 stainless steel Substances 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 13
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims description 44
- 229910045601 alloy Inorganic materials 0.000 claims description 23
- 239000000956 alloy Substances 0.000 claims description 23
- 229910001566 austenite Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 36
- 238000005260 corrosion Methods 0.000 abstract description 34
- 230000007797 corrosion Effects 0.000 abstract description 34
- 229910000963 austenitic stainless steel Inorganic materials 0.000 abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 abstract description 8
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 229910052759 nickel Inorganic materials 0.000 abstract description 6
- 229910052804 chromium Inorganic materials 0.000 abstract description 4
- 229910052748 manganese Inorganic materials 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 14
- 238000004513 sizing Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 238000005245 sintering Methods 0.000 description 6
- 238000007654 immersion Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000013585 weight reducing agent Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
Description
本発明は、ステンレス鋼焼結体とその製造方法に係わり、特に耐食性、耐硫酸性に優れたステンレス鋼焼結体に関する。 The present invention relates to a stainless steel sintered body and a method for producing the same, and particularly to a stainless steel sintered body having excellent corrosion resistance and sulfuric acid resistance.
ＳＵＳ３０４Ｌ（Ｃｒ：１８質量％、Ｎｉ：８．０質量％、残りをＦｅと不可避不純物）に代表されるオーステナイト系ステンレスは、優れた耐食性を備え、特に良好な耐硫酸性を示す。 Austenitic stainless steel represented by SUS304L (Cr: 18% by mass, Ni: 8.0% by mass, the balance being Fe and inevitable impurities) has excellent corrosion resistance and particularly good sulfuric acid resistance.
また、その焼結体は、粉末成形，焼結，サイジングの簡便な工程で製造することができ、機械加工や電気加工などの手間やコストを減らすことができるため、広く用いられている。 In addition, the sintered body is widely used because it can be manufactured by a simple process of powder molding, sintering, and sizing, and the labor and cost of machining and electrical processing can be reduced.
例えば、１３重量％Ｎｉを含有し、Ｃｕ粉末の添加量を全重量の２〜８重量％にした焼結時の寸法収縮率の小さいステンレス鋼焼結体の製造方法（例えば特許文献１）や、高強度を要求されるステンレス鋼焼結体の製造方法において、Ｎｉ：３．０〜５．０％，Ｃｕ：３．０〜５．０％としたフェライト相を主体とする粉末とオーステナイト相を主体とした粉末を混合し、これを成形及び焼結するステンレス鋼焼結体の製造方法（例えば特許文献２）が提案されている。
上記特許文献１のステンレス鋼焼結体では、希少資源で高価なＮｉの削減が課題となっている。これに対して、Ｎｉを削減したステンレス鋼焼結体として、特許文献２のステンレス鋼焼結体やＳＵＳ４３０Ｌを代表とするフェライト系ステンレスなどは、耐食性、特に耐硫酸性はオーステナイト系ステンレスに比べ著しく劣り、その改善が望まれている。 In the stainless steel sintered body of Patent Document 1, reduction of expensive and rare Ni is a problem. On the other hand, the stainless steel sintered body of Patent Document 2 and the ferritic stainless steel represented by SUS430L, etc. as the stainless steel sintered body with reduced Ni are significantly more resistant to corrosion, particularly sulfuric acid, than austenitic stainless steel. It is inferior and its improvement is desired.
そこで、本発明は、Ｎｉの使用量を削減しながら、オーステナイト系ステンレス焼結体と同等以上の耐食性、耐硫酸性を持つステンレス鋼焼結体とその製造方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a stainless steel sintered body having corrosion resistance and sulfuric acid resistance equal to or higher than that of an austenitic stainless sintered body while reducing the amount of Ni used, and a method for producing the same.
請求項１の発明は、
Ｆｅをベースとして、質量％で、
Ｃｒ：１３．０〜２２．０％、
Ｎｉ：３．５〜６．５％、
Ｍｏ：１．０〜２．５％、
Ｃｕ：０．２〜１．８％、
Ｃ：０．１％以下、
Ｓｉ：２．０％以下、
Ｍｎ：０．３％以下、
と不可避不純物を含有し、
体積％で、フェライト相が７０〜９０％、オーステナイト相が３０〜１０％からなる金属組織を有するものである。
The invention of claim 1
Based on Fe, in mass%,
Cr: 13.0-22.0%,
Ni: 3.5-6.5%
Mo: 1.0-2.5%,
Cu: 0.2 to 1.8%,
C: 0.1% or less,
Si: 2.0% or less,
Mn: 0.3% or less,
And contains inevitable impurities,
It has a metal structure composed of 70% to 90% ferrite phase and 30% to 10% austenite phase.
尚、以下の説明では、％はいずれも質量％を示す。 In the following description,% indicates mass%.
また、請求項２の発明は、オーステナイト系ステンレス合金粉，フェライト系ステンレス合金粉及びＣｕ粉を混合した原料粉末を成形して圧粉体を形成し、この圧粉体を焼結して焼結体を形成する製造方法である。 Further, the invention of claim 2 is to form a green compact by forming a raw powder mixed with austenitic stainless alloy powder, ferritic stainless alloy powder and Cu powder, and sintering and sintering the green compact. A manufacturing method for forming a body.
また、請求項３の発明は、単一の合金粉末を成形して圧粉体を形成し、この圧粉体を焼結して焼結体を形成する製造方法である。 The invention of claim 3 is a manufacturing method in which a single alloy powder is formed to form a green compact, and the green compact is sintered to form a sintered body.
また、請求項４の発明は、前記焼結体をサイジングする製造方法である。 The invention of claim 4 is a manufacturing method for sizing the sintered body.
上記構成によれば、オーステナイト系ステンレスに比べて、耐食性を確保するために添加されるＮｉ量を３．５〜６．５％に大幅に低減し、Ｃｒ１３．０〜２２．０％、Ｍｏ１．０〜２．５％を含有してフェライト相が主相、オーステナイト相が第二相からなる焼結体に、Ｃｕを０．２〜１．８％の特定量添加することにより、オーステナイト系ステンレスと同等の耐硫酸性を示す焼結体が得られる。 According to the said structure, compared with austenitic stainless steel, the amount of Ni added in order to ensure corrosion resistance is reduced significantly to 3.5-6.5%, Cr13.0-22.0%, Mo1. By adding a specific amount of Cu of 0.2 to 1.8% to a sintered body containing 0 to 2.5% and containing a ferrite phase as a main phase and an austenite phase as a second phase, an austenitic stainless steel is added. As a result, a sintered body having the same sulfuric acid resistance can be obtained.
また、Ｃｕ量：０．２〜１．８％を含有し、これがマトリックスに固溶して耐食性、特に耐硫酸性の向上に有効であり、０．２％未満では、その効果が得られず、１．８％を超えるとフリーのＣｕ相が析出し、却ってその効果が減少する。 Also, Cu content: 0.2 to 1.8%, which is effective in improving the corrosion resistance, particularly sulfuric acid resistance by solid solution in the matrix, if less than 0.2%, the effect is not obtained If it exceeds 1.8%, a free Cu phase is precipitated, and the effect is reduced.
また、上記製造方法によれば、オーステナイト系ステンレス焼結体と同等以上の耐食性、耐硫酸性を持つステンレス鋼焼結体を製造することができる。 Moreover, according to the said manufacturing method, the stainless steel sintered compact which has corrosion resistance and sulfuric acid resistance equivalent to or more than an austenitic stainless sintered body can be manufactured.
また、製造方法において、所要組成からなる単一の合金粉末を用いても、得られる焼結体はフェライト相とオーステナイト相からなり、同様な特性を有する製品が得られる。 Moreover, even if a single alloy powder having a required composition is used in the manufacturing method, the obtained sintered body is composed of a ferrite phase and an austenite phase, and a product having similar characteristics can be obtained.
本発明における好適な実施の形態について、添付図面を参照しながら詳細に説明する。なお、以下に説明する実施の形態は、特許請求の範囲に記載された本発明の内容を限定するものではない。また、以下に説明される構成の全てが、本発明の必須要件であるとは限らない。各実施例では、従来とは異なる新規なステンレス鋼焼結体とその製造方法を採用することにより、従来にないステンレス鋼焼結体とその製造方法が得られ、ステンレス鋼焼結体とその製造方法を夫々記述する。 Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention. In each example, by adopting a new stainless steel sintered body different from the conventional one and its manufacturing method, an unprecedented stainless steel sintered body and its manufacturing method can be obtained. Each method is described.
本発明では、オーステナイト系ステンレス合金粉，フェライト系ステンレス合金粉及びＣｕ粉を所定の配合量で混合した原料粉末を用い、この原料粉末を圧縮して所定形状の圧粉体を形成し、この圧粉体を焼結してステンレス鋼焼結体を形成し、この焼結体をサイジングしてステンレス鋼焼結体の製品を製造する。あるいは所要組成からなる単一の合金粉末を用い、この合金粉末を圧縮して所定形状の圧粉体を形成し、この圧粉体を焼結してステンレス鋼焼結体を形成し、この焼結体をサイジングしてステンレス鋼焼結体の製品を製造する。 In the present invention, a raw material powder obtained by mixing austenitic stainless alloy powder, ferritic stainless alloy powder and Cu powder in a predetermined blending amount is compressed to form a green compact having a predetermined shape. The powder is sintered to form a stainless steel sintered body, and the sintered body is sized to produce a stainless steel sintered body product. Alternatively, a single alloy powder having the required composition is used, the alloy powder is compressed to form a green compact of a predetermined shape, and the green compact is sintered to form a stainless steel sintered body. Sizing the body to produce a sintered stainless steel product.
本発明のステンレス鋼焼結体は、
Ｆｅをベースとして、質量％で、
Ｃｒ：１３．０〜２２．０％、
Ｎｉ：３．５〜６．５％、
Ｍｏ：１．０〜２．５％、
Ｃｕ：０．２〜１．８％、
Ｃ：０．１％以下、
Ｓｉ：２．０％以下、
Ｍｎ：０．３％以下、
と不可避不純物を含有し、
体積％で、フェライト相が７０〜９０％、オーステナイト相が３０〜１０％からなる金属組織を有する。
The sintered stainless steel of the present invention is
Based on Fe, in mass%,
Cr: 13.0-22.0%,
Ni: 3.5-6.5%
Mo: 1.0-2.5%,
Cu: 0.2 to 1.8%,
C: 0.1% or less,
Si: 2.0% or less,
Mn: 0.3% or less,
And contains inevitable impurities,
It has a metal structure composed of 70% to 90% ferrite phase and 30% to 10% austenite phase.
Ｃｒは耐食性の向上に効果的であるが、１３．０％に満たないと効果が十分でなく、また、２２．０％を超えると成形時の圧縮性の低下を招くため１３．０％〜２２．０％とする。 Cr is effective in improving the corrosion resistance, but the effect is not sufficient if it is less than 13.0%, and if it exceeds 22.0%, the compressibility at the time of molding is reduced, so that it is 13.0%- 22.0%.
Ｎｉは耐食性の向上に効果的であるが、３．５％に満たないと効果が十分でなく、また、６．５％を超えると焼結性の低下、及び高価にもなるため３．５％〜６．５％とする。 Ni is effective for improving the corrosion resistance, but the effect is not sufficient if it is less than 3.5%, and if it exceeds 6.5%, the sinterability is lowered and the cost is also increased. % To 6.5%.
ＭｏはＮｉ，Ｃｕとの共存で耐食性の向上に効果的であるが、１．０％に満たないと効果が十分でなく、また、２．５％を超えると成形時の圧縮性を低下させるため１．０％〜２．５％とする。 Mo is effective in improving corrosion resistance in the presence of Ni and Cu. However, if less than 1.0%, the effect is not sufficient, and if over 2.5%, the compressibility during molding is lowered. Therefore, the content is set to 1.0% to 2.5%.
ＣｕはＮｉ，Ｍｏとの共存で耐食性を向上させるが、０．２％に満たないと効果が十分でなく、また、１．８％を超えると粒界、粒内に析出し耐食性を低下させるため０．２％〜１．８％とする。 Cu improves the corrosion resistance in coexistence with Ni and Mo, but the effect is not sufficient if it is less than 0.2%, and if it exceeds 1.8%, it precipitates at the grain boundaries and within the grains and lowers the corrosion resistance. Therefore, the content is set to 0.2% to 1.8%.
Ｃは０．１％を超えると成形時の圧縮性の低下を招く。また、焼結後の合金中に含まれると耐食性を阻害するので０．１％以下とする
Ｓｉは２．０％を超えると粉末の硬度が増し、成形性の低下を招くため２．０％以下とする。
When C exceeds 0.1%, the compressibility during molding is reduced. Further, if contained in the sintered alloy, the corrosion resistance is hindered, so 0.1% or less. If Si exceeds 2.0%, the hardness of the powder increases and the formability is lowered. The following.
Ｍｎは０．３％を超えると成形時の圧縮性の低下を招くため０．３％以下とする。 If Mn exceeds 0.3%, the compressibility at the time of molding is reduced, so 0.3% or less.
特に、Ｃｕが１．８質量％以内であると、マトリックスに固溶して耐食性，特に耐硫酸性を向上させ、一方、Ｃｕが１．８質量％を超えると、フリーのＣｕ相が析出し、その効果が減少するため、上記の範囲とした。 In particular, when Cu is within 1.8% by mass, the solid solution dissolves in the matrix to improve corrosion resistance, particularly sulfuric acid resistance. On the other hand, when Cu exceeds 1.8% by mass, a free Cu phase is precipitated. Since the effect is reduced, the above range is adopted.
以下、本発明の実施例を添付図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
オーステナイト系合金粉末及びフェライト系合金粉末は下記の表１に示す成分のものを用いた。尚、表１に示す成分の残部はＦｅと不可避不純物である。 As the austenitic alloy powder and the ferrite alloy powder, those shown in Table 1 below were used. The balance of the components shown in Table 1 is Fe and inevitable impurities.
次に、各試験片より縦８ｍｍ×横８ｍｍ×高さ４ｍｍの試料を機械加工により採取し、この試料の硫酸水溶液浸漬試験を行い、試験前後での腐食重量減少率を測定した。 Next, a sample having a length of 8 mm, a width of 8 mm, and a height of 4 mm was sampled from each test piece by machining, and a sulfuric acid aqueous solution immersion test of the sample was performed to measure the corrosion weight reduction rate before and after the test.
硫酸水溶液浸漬試験は、硫酸溶液濃度５％、硫酸溶液温度２０℃、浸漬時間１０時間の条件で行い、この後の試料の重量減少率を測定し、下記の表３に示す結果が得られた。 The sulfuric acid aqueous solution immersion test was performed under the conditions of a sulfuric acid solution concentration of 5%, a sulfuric acid solution temperature of 20 ° C., and an immersion time of 10 hours, and the weight reduction rate of the subsequent samples was measured. The results shown in Table 3 below were obtained. .
比較例ｊは、Ｃｒを２２％を超えて添加したため、Ｃｕ粉を１．０％添加した効果が得られず、腐食重量減少率が高くなった。 Since the comparative example j added Cr exceeding 22%, the effect of adding 1.0% of Cu powder was not obtained, and the corrosion weight reduction rate was increased.
比較例ｋは、Ｎｉ成分を増加してＣｕを添加したが、Ｍｏを含有しないため、十分な耐食性が得られない。比較例ｌのように、ＮｉとＭｏを添加しても、Ｃｕを添加しないと、耐食性が向上しない。比較例ｍのように、ＭｏとＣｕを添加しても、Ｍｏの添加量が範囲外の場合、耐食性が向上しない。 In Comparative Example k, the Ni component was increased and Cu was added, but since Mo was not contained, sufficient corrosion resistance was not obtained. Even if Ni and Mo are added as in Comparative Example 1, the corrosion resistance is not improved unless Cu is added. Even if Mo and Cu are added as in Comparative Example m, the corrosion resistance is not improved if the amount of Mo added is out of range.
比較例ｎはオーステナイト系ＳＵＳ３０４Ｌの単一合金である。 Comparative Example n is an austenitic SUS304L single alloy.
上記のように、Ｃｕ粉の添加により耐食性の向上効果が見られるが、後述するように、１．８%を超えるとフリーのＣｕ相が析出し、その効果は減少する。また、比較例に示したように、Ｃｕ，Ｍｏ量が範囲未満の場合、効果は減少する。 As described above, the effect of improving the corrosion resistance can be seen by the addition of Cu powder. However, as will be described later, when it exceeds 1.8%, a free Cu phase is precipitated and the effect is reduced. Moreover, as shown in the comparative example, when the amount of Cu and Mo is less than the range, the effect is reduced.
また、単一の合金粉末を用いた実施例ｏ，ｐにおいても、同様の効果が得られる。 The same effect can be obtained also in Examples o and p using a single alloy powder.
図１は、Ｃｕの添加量の変化による腐食の影響を示すグラフであり、Ｃｕの質量％が０％，０．５％，１．０％，２．０％，４．０％の前記実験例ｅ〜ｉの硫酸水溶液浸漬試験の結果を示している。 FIG. 1 is a graph showing the influence of corrosion due to a change in the amount of Cu added, and the experiment in which the mass% of Cu is 0%, 0.5%, 1.0%, 2.0%, and 4.0%. The result of the sulfuric acid aqueous solution immersion test of Example ei is shown.
この結果、Ｃｕの添加量が０．５％と１．０％では、極めて高い耐食性が得られ、Ｃｕが２．０％を超えると、耐食性が低下し、略１．８％（図示せず）まで高い耐食性が得られ、一方、Ｃｕが０％では、耐食性が低下し、略０．２％（図示せず）まで高い耐食性が得られることが分かった。 As a result, when the addition amount of Cu is 0.5% and 1.0%, extremely high corrosion resistance is obtained, and when Cu exceeds 2.0%, the corrosion resistance is reduced to about 1.8% (not shown). On the other hand, it was found that when Cu is 0%, the corrosion resistance is lowered, and high corrosion resistance is obtained up to about 0.2% (not shown).
図２は、比較例ｈ，ｉの金属組織の拡大写真であり、金属顕微鏡を用いて４００倍に拡大している。図２（Ａ）がＣｕを２．０質量％含有する比較例ｈを示し、図２（Ｂ）がＣｕを４．０質量％含有する比較例ｉを示す。 FIG. 2 is an enlarged photograph of the metal structure of Comparative Examples h and i, which is magnified 400 times using a metal microscope. 2A shows Comparative Example h containing 2.0% by mass of Cu, and FIG. 2B shows Comparative Example i containing 4.0% by mass of Cu.
図２（Ａ）では、粒界にＣｕが析出し、図２（Ｂ）では、粒界だけでなく粒内にもＣｕが析出し、Ｃｕを２．０質量％以上含有すると、耐食性が低下することが分かる。 In FIG. 2 (A), Cu precipitates at the grain boundaries, and in FIG. 2 (B), Cu precipitates not only at the grain boundaries but also within the grains. When Cu is contained in an amount of 2.0% by mass or more, the corrosion resistance decreases. I understand that
次に、製品の寸法精度に係る測定を行った。前記実施例ａ〜ｄ及びｏ，ｐの原料粉末を成形圧力５８８ＭＰａにて、直径１１．３ｍｍ×高さ１０ｍｍの円筒形状の圧粉体を成形し、この圧粉体を真空中で１２５０℃で１時間焼結を行い焼結体を得た。この焼結体の真円度測定を真円度測定機にて行った。また、同焼結体を４９０ＭＰａの圧力にてサイジングを行い、同様に真円度を測定し、標準偏差を求め、下記の表４に示す結果が得られた。 Next, measurements related to the dimensional accuracy of the product were performed. The raw material powders of Examples a to d, o, and p were formed into a green compact having a diameter of 11.3 mm and a height of 10 mm at a molding pressure of 588 MPa, and the green compact was vacuumed at 1250 ° C. Sintering was performed for 1 hour to obtain a sintered body. The roundness of the sintered body was measured with a roundness measuring machine. Further, the sintered body was sized at a pressure of 490 MPa, the roundness was measured in the same manner, the standard deviation was obtained, and the results shown in Table 4 below were obtained.
上記の表４に示すように、本実施例では、焼結体をサイジングすることにより、寸法精度を高め、ばらつきの少ない製品を製造することができる。 As shown in Table 4 above, in this example, by sizing the sintered body, it is possible to increase the dimensional accuracy and manufacture a product with little variation.
このように本実施例では、Ｆｅをベースとして、Ｃｒ：１３．０〜２２．０％、Ｎｉ：３．５〜６．５％、Ｍｏ：１．０〜２．５％、Ｃｕ：０．２〜１．８％、Ｃ：０．１％以下、Ｓｉ：２．０％以下、Ｍｎ：０．３％以下、とその他の不可避不純物を含有し、体積％で、フェライト相が７０〜９０％、オーステナイト相が３０〜１０％からなる金属組織を有するものであり、オーステナイト系ステンレスに比べて耐食性を確保するために添加されるＮｉ量を３．５〜６．５％に大幅に低減し、Ｃｒを１３．０〜２２．０％、Ｍｏを１．０〜２．５％含有してフェライト相が主相、オーステナイト相が第二相からなる焼結体に、Ｃｕを０．２〜１．８％（好ましくは０．５〜１．０％）の特定量添加することにより、オーステナイト系ステンレスと同等の耐硫酸性を示す焼結体が得られる。 As described above, in this example, based on Fe, Cr: 13.0 to 22.0%, Ni: 3.5 to 6.5%, Mo: 1.0 to 2.5%, Cu: 0.00. 2 to 1.8%, C: 0.1% or less, Si: 2.0% or less, Mn: 0.3% or less, and other inevitable impurities, and the ferrite phase is 70 to 90% by volume. %, The austenite phase has a metal structure composed of 30 to 10%, and the amount of Ni added to ensure corrosion resistance compared to austenitic stainless steel is greatly reduced to 3.5 to 6.5%. In a sintered body containing 13.0 to 22.0% Cr, 1.0 to 2.5% Mo, the ferrite phase being the main phase, and the austenite phase being the second phase, By adding a specific amount of 1.8% (preferably 0.5 to 1.0%), austenitic stainless steel is added. Sintered body showing a scan equivalent sulfuric acid is obtained.
また、好ましくは、Ｎｉの添加量を３．５〜５．０％とすることにより、一層耐食性を向上することできる。 Preferably, the corrosion resistance can be further improved by setting the amount of Ni added to 3.5 to 5.0%.
また、Ｃｕ量：０．２〜１．８％を含有し、これがマトリックスに固溶して耐食性、特に耐硫酸性の向上に有効であり、０．２％未満では、その効果が得られず、１．８％を超えるとフリーのＣｕ相が析出し、却ってその効果が減少する。 Also, Cu content: 0.2 to 1.8%, which is effective in improving the corrosion resistance, particularly sulfuric acid resistance by solid solution in the matrix, if less than 0.2%, the effect is not obtained If it exceeds 1.8%, a free Cu phase is precipitated, and the effect is reduced.
また、このように本実施例では、オーステナイト系ステンレス合金粉，フェライト系ステンレス合金粉及びＣｕ粉を混合した原料粉末を成形して圧粉体を形成し、この圧粉体を焼結して焼結体を形成してなるものであり、オーステナイト系ステンレス焼結体と同等以上の耐食性、耐硫酸性を持つステンレス鋼焼結体を製造することができる。 As described above, in this embodiment, a raw powder mixed with austenitic stainless alloy powder, ferritic stainless alloy powder and Cu powder is formed to form a green compact, and this green compact is sintered and sintered. A stainless steel sintered body having a corrosion resistance and sulfuric acid resistance equal to or higher than that of an austenitic stainless sintered body can be produced.
また、このように本実施例では、単一の合金粉末を成形して圧粉体を形成し、この圧粉体を焼結して焼結体を形成する製造方法であり、所要組成からなる単一の合金粉末を用いても、得られる焼結体は同様な特性を有する製品が得られる。 Further, in this embodiment, a single alloy powder is formed to form a green compact, and this green compact is sintered to form a sintered body, which has a required composition. Even when a single alloy powder is used, a product having similar characteristics can be obtained from the obtained sintered body.
また、このように本実施例では、焼結体をサイジングする製造方法であり、寸法精度の高い製品が得られる。 In this way, the present embodiment is a manufacturing method for sizing a sintered body, and a product with high dimensional accuracy can be obtained.
尚、本発明は、前記実施形態に限定されるものではなく、種々の変形実施が可能である。 In addition, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible.
Claims (4)
Ｃｒ：１３．０〜２２．０％、
Ｎｉ：３．５〜６．５％、
Ｍｏ：１．０〜２．５％、
Ｃｕ：０．２〜１．８％、
Ｃ：０．１％以下、
Ｓｉ：２．０％以下、
Ｍｎ：０．３％以下、
と不可避不純物を含有し、
体積％で、フェライト相が７０〜９０％、オーステナイト相が３０〜１０％からなる金属組織を有することを特徴とするステンレス鋼焼結体。 Based on Fe, in mass%,
Cr: 13.0-22.0%,
Ni: 3.5-6.5%
Mo: 1.0-2.5%,
Cu: 0.2 to 1.8%,
C: 0.1% or less,
Si: 2.0% or less,
Mn: 0.3% or less,
And contains inevitable impurities,
A stainless steel sintered body characterized by having a metal structure consisting of 70% to 90% ferrite phase and 30% to 10% austenite phase in volume%.
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