JP3068127B2 - Wear-resistant iron-based sintered alloy and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an iron-based sintering iron-based alloy having excellent wear resistance useful for sintered parts such as valve seats, piston rings or exhaust system collars used in internal combustion engines. It relates to the manufacturing method.

[0002]

2. Description of the Related Art Conventional valve seat materials include Fe.
Intermetallic compounds such as ferromolybdenum (Fe-Mo) and ferrochrome (Fe-Cr) or Fe-C for the purpose of improving wear resistance of -C-Co-Ni-based material and Fe-C-based material
-Cr-Mo-V alloy or the like is used (JP-A-56-154110).

Further, Fe— containing Cr and Mo
A sintered alloy in which iron-based hard particles composed of Cr, Mo, V, etc. are dispersed in a C base structure to improve abrasion resistance and aggressiveness to a partner (Japanese Patent Laid-Open No. 60-224762), and Fe-C-
A sintered alloy in which hard particles made of FeMo and FeW are dispersed in a Co-Ni base matrix and impregnated with a Pb alloy or the like to improve wear resistance (Japanese Patent Laid-Open No. 62-202058)
Gazette).

[0004] The characteristics required for the valve seat material include corrosion resistance and heat resistance in addition to wear resistance.
Hard particles are mainly responsible for wear resistance, and corrosion resistance and heat resistance are mainly responsible for base structures, and the two are combined to ensure durability.

[0005]

In recent years, there has been a growing demand for improvement in automobile engines for longer life, higher output, higher rotation speed, measures for purifying exhaust gas, or measures for improving fuel efficiency. For this reason, it has become unavoidable for engine valves and valve seats in automobile engines to withstand more severe use environments than ever before, and heat resistance and wear resistance are further improved, and at high temperatures. It has become necessary to improve the corrosion resistance of steel.

[0006] However, the formation of the base of the conventional iron-based valve seat material is based on the alloying elements Ni, C
After mixing elemental powders of the respective elements such as o, Mo, etc., the mixed powder is molded and sintered as a raw material to obtain Ni, Co, Mo.
Etc. are diffused in iron. For example, Japanese Patent Application Laid-Open No. 3-158
In the sintered alloy for an Fe-based valve seat disclosed in Japanese Patent No. 444, Fe-Cr powder, carbonyl powder, Co
Powder, Mo powder and graphite powder are prepared, and hard particles are blended into the powder, and Fe particles in which hard particles are dispersed in an Fe-based alloy base material.
A base sintered alloy valve seat has been obtained. Therefore, it is difficult to completely diffuse these alloy elements into iron,
It is difficult to obtain an improvement in characteristics corresponding to the amount added.

Therefore, in order to efficiently bring out the effect of alloying element addition, it is conceivable to alloy the alloying element with iron in advance.
The solid solution hardening reduces the compressibility of the alloyed iron powder, making it difficult to increase the density of the green compact, which is disadvantageous for improving the durability.

The present invention has been made to solve the above-mentioned problems of the conventional iron-based valve seat material and the iron-based alloy powder used for the iron-based valve seat material.
It is an object of the present invention to provide an iron-based sintered alloy having a further improved heat resistance and abrasion resistance in response to a severe use environment of recent valve seat materials, and a method for producing the same.

[0009]

Means for Solving the Problems Accordingly, the present inventors have
In order to improve wear resistance, corrosion resistance and oxidation resistance, the chemical composition and alloying form of the matrix of the iron-based sintered alloy for valve seats, the type and amount of hard particles, the matrix structure and the sintering conditions, etc. , Earnestly studied. as a result,
In addition to finding a specific composition range and alloying morphology of the matrix that exhibits excellent oxidation resistance and corrosion resistance, by dispersing hard particles with a specific composition range in this matrix, extremely good wear resistance, The inventors have found that they can maintain corrosion resistance and oxidation resistance, and have found that they are more economical than conventional materials, and have completed the present invention.

The wear-resistant iron-based sintered alloy according to claim 1 of the present invention has a total composition of Co: 1.3 to 15% by weight,
o; 1.3 to 10%, Cr: 0.8 to 18%, W;
05 to 2.4%, C; 0.2 to 3.2%, Ni; 0.5
-17%, with the balance being Fe and unavoidable impurities, and by weight, Co; 2-15%, Mo; 2-1.
0%, C: 0.2 to 2%, Ni: 10% or less, the balance being Cr and 40 to 75%, W; 3 to 12.5 by weight in a matrix consisting of Fe and inevitable impurities. %, C; 1
The gist of the present invention is that hard particles containing Ni and inevitable impurities are dispersed in an amount of 2 to 30%.

The wear-resistant iron-based sintered alloy according to claim 2 of the present invention has a total composition of Co: 1.3 to 15% by weight and M
o; 1.3 to 10%, Cr: 0.8 to 18%, W;
05 to 2.4%, C; 0.2 to 3.2%, Ni; 0.5
-17%, and further Si; 0.005-0.6
%, Nb: 0.02 to 1.2%, Ti; 0.01 to 0.
One or more of 75%, with the balance being Fe
And unavoidable impurities and in a weight ratio of Co; 2
-15%, Mo: 2-10%, C: 0.2-2%, N
i: in a matrix containing 10% or less, with the balance being Fe and unavoidable impurities, in a weight ratio of Cr: 40 to 75%,
W; 3 to 12.5%; C; 1 to 5%;
i; 0.3 to 2.5%, Nb; 1 to 5%, Ti; 0.5
2 to 30% of hard particles containing one or two or more of 3.1% and the balance consisting of Ni and unavoidable impurities
The point is that they are dispersed.

The wear-resistant iron-based sintered alloy according to claim 3 of the present invention has a total composition by weight of Co: 1.3 to 15%, M
o; 2.0 to 10%, Cr; 0.8 to 18%, W;
0.05-2.4%, C; 0.2-3.2% and Ni;
5% to 17%, the balance being Fe and unavoidable impurities, and 2% to 15% Co, 3% Mo by weight.
Over 10%, C: 0.2-2%, Ni: 10%
In a matrix containing the following and the balance being Fe and inevitable impurities, Cr: 40 to 75%, W;
The gist is that the hard particles containing 2.5% and C; 1 to 5%, and the balance being Ni and unavoidable impurities are dispersed by 2 to 30%.

The wear-resistant iron-based sintered alloy according to claim 4 of the present invention has a total composition of Co: 1.4 to 15% by weight, M
o; 2.0 to 10%, Cr; 0.8 to 18%, W;
05 to 2.4%, C; 0.2 to 3.2%, Ni; 0.5
-17%, and further Si; 0.005-0.6
%, Nb: 0.02 to 1.2%, Ti; 0.01 to 0.
One or more of 75%, with the balance being Fe
And unavoidable impurities and in a weight ratio of Co; 2
-15%, Mo; more than 3%, 10%, C: 0.2-2
%, Ni; 10% or less, with the balance being Cr and 40 to 75 in a matrix consisting of Fe and inevitable impurities.
%, W; 3 to 12.5%, C; 1 to 5%, and further Si: 0.3 to 2.5%, Nb; 1 to 5%, Ti;
Containing one or more of 0.5 to 3.1%,
The hard particles consisting of Ni and unavoidable impurities are
The gist is that the dispersion is 30%.

The method for producing a wear-resistant iron-based sintered alloy according to claim 5 of the present invention is characterized in that the weight ratio of Co: 2 to 15%, Mo;
10%, the balance being Cr; 40 to 60% by weight relative to the iron-based alloy powder composed of Fe and unavoidable impurities.
W: 3 to 10%, C: 1 to 4%, the balance being 2 to 30% of a Ni-based alloy powder composed of Ni and inevitable impurities.
The main point is that 0.2 to 2% of graphite powder and a molding lubricant are mixed, molded, and sintered at a temperature from 1323 K to the melting point of the Ni-based alloy powder or lower.

The method for producing a wear-resistant iron-based sintered alloy according to claim 6 of the present invention is characterized in that the weight ratio of Co: 2 to 15%;
10%, the balance being Cr; 40 to 60% by weight relative to the iron-based alloy powder composed of Fe and unavoidable impurities.
W; 3-10%, C; 1-4%, and further Si;
0.3-2.0%, Nb; 1-4%, Ti; 0.5-
One or more of 2.5%, with the balance being N
Ni-based alloy powder consisting of i and inevitable impurities
The gist is that 0%, 0.2 to 2% of graphite powder and a molding lubricant are mixed and molded, and sintered at a temperature from 1323 K to a melting point of the Ni-based alloy powder or lower.

The method for producing a wear-resistant iron-based sintered alloy according to claim 7 of the present invention is characterized in that the weight ratio of Co is 2 to 15% and Mo is 3%.
, And the balance is Cr: 40 to 6 with respect to the iron-based alloy powder containing Fe and unavoidable impurities.
0%, W: 3 to 10%, C: 1 to 4%, the balance being Ni to 2%.
The gist is that 30%, 0.2 to 2% of graphite powder and a molding lubricant are mixed and molded, and sintered at a temperature of 1323K to a temperature equal to or lower than the melting point of the Ni-based alloy powder.

The method for producing a wear-resistant iron-based sintered alloy according to claim 8 of the present invention is characterized in that Co: 2 to 15%, Mo: 3%
, And the balance is Cr: 40 to 6 with respect to the iron-based alloy powder containing Fe and unavoidable impurities.
0%, W: 3 to 10%, C: 1 to 4%, Si: 0.3 to 2.0%, Nb: 1 to 4%, Ti;
5% to 2.5% of Ni-based alloy powder containing one or more kinds and the balance consisting of Ni and unavoidable impurities.
The gist of the present invention is to mix and mold a lubricant for molding with ３０30%, graphite powder 0.2 黒 2%, and sinter at a temperature from 1323 K to the melting point of the Ni-based alloy powder or lower.

[0018]

The iron-based sintered alloy of the present invention has a base structure of Co: 2 to 15%, Mo: 2 to 10%, C: 0.2 to 2 by weight.
%, Ni; 10% or less, excellent corrosion resistance, oxidation resistance and abrasion resistance can be obtained.

The Ni-based alloy powder dispersed in the matrix is novel. Cr and W in the Ni-based alloy powder combine with C to form carbides, thereby improving wear resistance. Further, Ni in the Ni-based alloy powder diffuses into the matrix during sintering, and improves oxidation resistance.

In the method for producing an iron-based sintered alloy according to the present invention, the base structure is sintered using an alloy powder containing 2 to 15% of Co and 2 to 10% of Mo by weight ratio. Has a high degree of solid solution homogeneity in a base material, and excellent corrosion resistance, oxidation resistance and wear resistance can be obtained with a small alloy amount as compared with the conventional method of mixing element powders. In addition, since the composition range of the alloying element is regulated to the above composition range, the compressibility is less reduced, and the compressibility is slightly reduced as compared with the conventional method of mixing the element powder, but is almost the same, and the density is related to the density. There is no risk of affecting strong oxidation resistance and corrosion resistance.

The sintering conditions of the present invention are as follows: in a non-oxidizing atmosphere, in a temperature range from 1323 K to the melting point of the hard particles, preferably from 1323 K to 1473 K, from 900 to 7
It is necessary to hold for 200 s. Sintering temperature 132
If the temperature is less than 3K, the sintering proceeds insufficiently, leading to insufficient strength of the matrix and insufficient bonding force between the hard particles and the matrix. This is because the abrasion resistance possessed is lost. By maintaining the sintering temperature at 900 to 7200 s, a part of the Ni component in the hard particles diffuses into the matrix, thereby improving the heat resistance of the matrix and strengthening the bond between the hard particles and the matrix. The falling resistance of the particles is improved.

Next, the reason why the composition of the alloy powder and the like in the present invention is limited will be described. Fe-2 to 15% Co-2 to 10% Mo alloy powder; this alloy powder forms the matrix of the material of the present invention, and Co forms a solid solution in the matrix to strengthen it and improve heat resistance. When the content is less than 2%, the effect is insufficient. On the other hand, when the content is more than 15%, the effect is further improved, but the economy is low. １５15%. In order to obtain higher durability, it is more preferable that the content be more than 3% and not more than 10%.

Mo forms a solid solution in the matrix and strengthens it, and also has an effect of improving strength and corrosion resistance in a high temperature range. In a sintered body containing carbon, a part of carbides forms carbides and wear resistance. It is effective in improving sex. These effects are
If the content is less than 2%, the content is insufficient. If it exceeds 10%, the effect is improved, but the compressibility of the powder is reduced.

Ni-based alloy powder; Ni-based alloy powder is a hard particle powder developed by the present inventors and contributes to improvement of wear resistance. Ni-based alloy powder is Cr;
60%, W: 3 to 10%, C: 1 to 4%, the balance being Ni containing unavoidable impurities or Cr by weight: 40
-60%, W: 3-10%, C: 1-4% and Si;
3 to 2.0%, Nb; 1 to 4%, Ti; 0.5 to 2.5
%, And the balance is composed of Ni containing unavoidable impurities. Cr, W, Si, Nb, and Ti combine with C to form carbides, thereby contributing to improvement in wear resistance. Ni contributes to the improvement of the corrosion resistance of the alloy powder,
Due to the sintering, a part thereof is diffused into the matrix by the sintering and contributes to the improvement of the oxidation resistance. If Ni is alloyed in advance with the Fe-Co-Mo alloy powder, the compressibility deteriorates. However, in the present invention, Ni in the Ni-based alloy powder diffuses into the matrix to improve oxidation resistance. Mo
There is no need to pre-alloy Ni into the alloy powder.

If the addition amount of the hard particles is less than 2%, the improvement of the wear resistance is insufficient, and if it exceeds 30%, the improvement is small for the addition and the moldability is lowered. Therefore, the addition amount is set to 2 to 30%.

Graphite powder: 0.2 to 2% Carbon solid-dissolves in the matrix to strengthen the matrix, and partly diffuses into the Ni-based alloy powder to increase the hardness of the Ni-based alloy powder and increase the wear resistance. Effective for improvement. 0.
If the addition is less than 2%, the above effect cannot be expected. If the addition exceeds 2%, the sintered alloy is embrittled, which is not preferable, and the addition of 0.2 to 2% is appropriate.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in comparison with comparative examples to clarify the features of the present invention. Embodiment 1 of the present invention
As Mo, 4.7% by weight, Mo; 5.8% by weight.
Iron-based sprayed alloy powder A (having a particle size of 17
7 μm or less), Cr: 48.3% by weight, W: 4.6
%, C: 1.9% Ni-based spray alloy powder B (particle diameter: 149 μm or less) substantially consisting of Ni, with the balance being Cr: 47.7%
%, W: 5.1%, Si: 0.7%, C: 2.1%, N
b; Ni-based sprayed alloy powder C with 1.3% balance substantially Ni
(A particle size of 149 μm or less), graphite powder and a lubricant zinc stearate were prepared, weighed so as to have a composition shown in Table 1, and then molded into a green compact having a density of 6.9 g / cm ³ .

As comparative materials 1 to 4, alloy powder A, alloy powder B, sprayed iron powder, Co powder, Mo powder, Ni powder, FeMo
Powder, graphite powder and a lubricant zinc stearate were prepared and weighed to obtain the composition shown in Table 1, and then the density was 6.9 g /
A green compact of cm ³ was formed. The obtained green compacts of Examples and Comparative Examples were sintered in a decomposed ammonia gas atmosphere to produce each Example and Comparative Material. Note that the sintering temperature was the same as in Example 1.
-5 and Comparative Materials 1-2 are 1403K, Comparative Material 3 is 1273
K, the comparative material 4 is sintered at a temperature of 1563 K for 1.8 Ks for a time,

[0029]

[Table 1]

The test pieces of Examples 1 to 5 and Comparative materials 1 to 4 were subjected to an Ogoshi wear test as an evaluation of wear resistance, and Examples 2 and 4 and Comparative materials 1 and 3 were evaluated for actual machines. The suitability as a valve seat was investigated. The results of the wear resistance evaluation are shown in Table 2 together with the overall chemical components of the examples and comparative materials. FIG. 1 shows the amounts of wear of the valves and valve seats in the actual machine durability test.

The conditions for the Ogoshi wear test were as follows. Counterpart material (rotor) Stellite No. in JIS SUH35 No. 6 block material Example and comparative material Sliding speed 0.25 m / s Friction distance 100 m Final load 31.5 N Temperature rotor; 873K block; 673K Measurement item Block wear volume

The conditions for the actual machine durability test were as follows. Engine 4-cylinder 2000cc Operating conditions 7200rpm × 360Ks
Full load Water temperature 383K Valve seats Examples 2 and 4 and Comparative materials 1 and 3 Valve Stellite No. was added to JIS SUH35. No. 6 face; Stellite No. 6 6 Deposits Measurement items Valve seat and valve wear

[0033]

[Table 2]

As shown in Table 2, since the comparative material used alloy element powder, the solid solution was inhomogeneous even though the alloy content was higher than that of the example, and the wear volume was 73.
It was as large as 9 to 85.2 × 10 ⁻³ mm ³ . On the other hand, in the example of the present invention, since the Ni-based hard alloy powder was dispersed using the alloy powder, the wear volume was 49.6 to 67.8 ×.
It was 10 ⁻³ mm ^3, which was significantly smaller than that of the comparative material. It was found that the alloy of the present invention had excellent wear resistance, and the effect of the present invention was confirmed.

Further, as shown in FIG. 1, the abrasion loss of the valves and valve seats in the actual base durability test was as small as about ２〜 to が of Examples 2 and 4 of Comparative Materials 1 and 3. Thus, the alloy of the present invention was found to be suitable as a valve seat.

[0036]

As described in detail above, the iron-based sintered alloy excellent in wear resistance of the present invention and the method for producing the same are described in terms of weight ratio of C.
o; 2 to 15%, Mo; 2 to 10%, with the balance being F
e; and iron-based alloy powder composed of unavoidable impurities, by weight: Cr: 40 to 60%, W: 3 to 10%, C: 1 to
2% to 30% of a Ni-based alloy powder containing 4% and the balance being Ni and unavoidable impurities, and 0.2% to 2% of a graphite powder
Is mixed and sintered at a temperature from 1323 K to the melting point of the Ni-based alloy powder or lower, and contained in a matrix containing Co, Mo, Ni and the balance being Fe and inevitable impurities, by weight ratio,
Hard particles containing Cr, W, and C, with the balance being Ni and unavoidable impurities, with 2 to 30% dispersed therein. Since the base structure was sintered using the alloy powder, the base material of the alloy element was removed. Is high in solid solution homogeneity, and excellent corrosion resistance, oxidation resistance and wear resistance can be obtained with a small alloy amount as compared with the conventional method of mixing element powders. Cr and W combine with C to form carbides, thereby improving wear resistance.

[Brief description of the drawings]

FIG. 1 is a view showing the wear amount of a valve and a valve seat in an actual machine durability test of an alloy of the present invention and a comparative material.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hiroshi Okajima 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (56) References JP-A-5-171372 (JP, A) JP-A-6-172942 (JP, A) JP-A-3-225008 (JP, A) JP-A-6-220591 (JP, A) JP-A-61-117255 (JP, A) JP-A-2-111848 (JP, A) ( 58) Field surveyed (Int.Cl. ⁷ , DB name) C22C 38/00-38/60 C22C 33/02 B22F 1/00-8/00

Claims (8)

(57) [Claims] 1. The composition according to claim 1, wherein the total composition is Co;
15%, Mo; 1.3 to 10%, Cr; 0.8 to 18
%, W; 0.05 to 2.4%, C; 0.2 to 3.2%,
Ni; 0.5 to 17%, the balance being Fe and unavoidable impurities, and Co; 2 to 15% by weight,
Mo: 2 to 10%, C: 0.2 to 2%, Ni: 10% or less, the balance being Cr and 40 to 75%, W; 3 ~ 12.
An iron-based sintered alloy having excellent wear resistance, characterized by containing 5%, C; and 1 to 5%, and hard particles composed of Ni and unavoidable impurities in the balance being dispersed in 2 to 30%. 2. The weight ratio of the overall composition is Co;
15%, Mo; 1.3 to 10%, Cr; 0.8 to 18
%, W; 0.05 to 2.4%, C; 0.2 to 3.2%,
Ni; contains 0.5 to 17%, and further contains Si; 0.00
5 to 0.6%, Nb; 0.02 to 1.2%, Ti;
Containing one or more of 01 to 0.75%,
The balance consists of Fe and unavoidable impurities, and by weight, Co: 2 to 15%, Mo: 2 to 10%, C: 0.2
~ 2%, Ni: 10% or less, the balance being Fe and unavoidable impurities, in a matrix consisting of Cr;
75%, W; 3 to 12.5%, C; 1 to 5%,
Further, Si: 0.3 to 2.5%, Nb: 1 to 5%, T
i; excellent in wear resistance characterized in that one or more of 0.5 to 3.1% is contained, and hard particles composed of Ni and unavoidable impurities are dispersed in 2 to 30% in the balance. Iron-based sintered alloy. 3. The weight ratio of the overall composition is Co;
5%, Mo; 2.0 to 10%, Cr; 0.8 to 18%,
W; 0.05-2.4%, C; 0.2-3.2% and N
i: 0.5 to 17%, the balance being Fe and unavoidable impurities, and Co; 2 to 15% by weight, M
o: more than 3% and 10% or less, C: 0.2 to 2%, N
i: in a matrix containing 10% or less, with the balance being Fe and unavoidable impurities, in a weight ratio of Cr: 40 to 75%,
W: 3 to 12.5%, C: 1 to 5%, the balance being N
An iron-based sintered alloy having excellent abrasion resistance, wherein 2 to 30% of hard particles comprising i and unavoidable impurities are dispersed. 4. The weight ratio of the total composition is Co;
5%, Mo; 2.0 to 10%, Cr; 0.8 to 18%,
W: 0.05 to 2.4%, C: 0.2 to 3.2%, N
i; containing 0.5 to 17% and further Si; 0.005
-0.6%, Nb; 0.02-1.2%, Ti; 0.0
1 to 0.75%, one or more of which contains Fe and unavoidable impurities, and the weight ratio is:
Co; 2 to 15%, Mo; more than 3%, 10%, C;
0.2 to 2%, Ni; in a matrix containing 10% or less, with the balance being Fe and unavoidable impurities, Cr;
40 to 75%, W; 3 to 12.5%, C; 1 to 5%, and further Si: 0.3 to 2.5%, Nb;
%, Ti; one or more of 0.5 to 3.1%, and hard particles composed of Ni and unavoidable impurities in the balance are dispersed in 2 to 30% of abrasion resistance. Excellent iron-based sintered alloy. 5. Co; 2 to 15% by weight, Mo;
10%, the balance being Cr; 40 to 60% by weight relative to the iron-based alloy powder composed of Fe and unavoidable impurities.
W: 3 to 10%, C: 1 to 4%, the balance being 2 to 30% of a Ni-based alloy powder composed of Ni and inevitable impurities.
An iron-based material having excellent wear resistance, characterized in that 0.2 to 2% of graphite powder and a molding lubricant are mixed, molded and sintered at a temperature from 1323 K to a melting point of the Ni-based alloy powder or lower. Manufacturing method of sintered alloy. 6. Co: 2 to 15% by weight, Mo;
10%, the balance being Cr; 40 to 60% by weight relative to the iron-based alloy powder composed of Fe and unavoidable impurities.
W; 3-10%, C; 1-4%, and further Si;
0.3-2.0%, Nb; 1-4%, Ti; 0.5-
One or more of 2.5%, with the balance being N
Ni-based alloy powder consisting of i and inevitable impurities
0%, 0.2 to 2% of graphite powder, and a molding lubricant are mixed, molded, and sintered at a temperature from 1323K to the melting point of the Ni-based alloy powder and excellent in abrasion resistance. Manufacturing method of iron-based sintered alloy. 7. Co: 2 to 15%, Mo: 3% by weight
, And the balance is Cr: 40 to 6 with respect to the iron-based alloy powder containing Fe and unavoidable impurities.
0%, W: 3 to 10%, C: 1 to 4%, the balance being Ni to 2%.
30%, 0.2 to 2% of graphite powder, and a molding lubricant are mixed, molded, and sintered at a temperature from 1323 K to a melting point of the Ni-based alloy powder or lower, and thus excellent in wear resistance. Manufacturing method of iron-based sintered alloy. 8. Co: 2 to 15%, Mo: 3% by weight
, And the balance is Cr: 40 to 6 with respect to the iron-based alloy powder containing Fe and unavoidable impurities.
0%, W: 3 to 10%, C: 1 to 4%, Si: 0.3 to 2.0%, Nb: 1 to 4%, Ti;
5% to 2.5% of Ni-based alloy powder containing one or more kinds and the balance consisting of Ni and unavoidable impurities.
~ 30%, graphite powder 0.2 ~ 2%, and a molding lubricant are mixed, molded, and sintered at a temperature of 1323K to the melting point of the Ni-based alloy powder or less. Manufacturing method of iron-based sintered alloy.