CN113649560A - Preparation method of special mixed powder for automobile gear hubs - Google Patents
Preparation method of special mixed powder for automobile gear hubs Download PDFInfo
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- CN113649560A CN113649560A CN202110887051.0A CN202110887051A CN113649560A CN 113649560 A CN113649560 A CN 113649560A CN 202110887051 A CN202110887051 A CN 202110887051A CN 113649560 A CN113649560 A CN 113649560A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000011812 mixed powder Substances 0.000 title claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 92
- 239000000956 alloy Substances 0.000 claims abstract description 62
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 62
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 41
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000011733 molybdenum Substances 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000314 lubricant Substances 0.000 claims abstract description 9
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000009792 diffusion process Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims description 19
- 239000000203 mixture Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 229910052742 iron Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 229910052759 nickel Inorganic materials 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- DSMZRNNAYQIMOM-UHFFFAOYSA-N iron molybdenum Chemical compound [Fe].[Fe].[Mo] DSMZRNNAYQIMOM-UHFFFAOYSA-N 0.000 claims description 6
- 230000000704 physical effect Effects 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 4
- 238000000889 atomisation Methods 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000009692 water atomization Methods 0.000 claims description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 238000005204 segregation Methods 0.000 abstract 1
- 150000007513 acids Chemical class 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
-
- 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
- C22C38/08—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
Abstract
The invention relates to a preparation method of special mixed powder for automobile gear hubs, which comprises the steps of firstly preparing molybdenum pre-alloyed steel powder, reducing the molybdenum pre-alloyed steel powder, adding nickel powder and copper powder, mixing, and diffusing to form first-step master alloy powder; adding nickel powder into the first-step master alloy powder, mixing to form second-step master alloy powder, adding graphite powder, manganese sulfide powder and a lubricant into the second-step master alloy, and mixing and bonding without segregation to form the special mixed powder for the automobile gear hub. In the mixed iron powder produced by the invention, the alloy element molybdenum is pre-alloyed by molten steel, the alloy element Cu is added into the base powder in a diffusion mode, the alloy element Ni is added into the base powder in a partial diffusion mode, and part of the alloy element Ni is directly added, so that the high strength of the product is ensured, the apparent hardness of the product is ensured, the fluctuation of the sintering size is stabilized, and the mechanical property of the product is improved.
Description
Technical Field
The invention relates to the field of powder metallurgy, in particular to a preparation method of special mixed powder for automobile gear hubs.
Background
At present, compared with other gear hub product parts, gear hub parts for gearboxes on automobiles are required to have high hardness (namely, the apparent hardness HV10 is more than or equal to 300 under one-time heat treatment) and higher compressibility requirement (namely, the compressibility (600MPa) is more than or equal to 7.0g/cm3) And the tissue requirement is uniform. The alloy mixed iron powder for producing the gear hub mainly comprises the control of the contents of Ni, Mo and Cu, and a production process thereof. Therefore, it is necessary to consider comprehensively how to simultaneously achieve good mechanical properties, compressibility, sintered dimensional stability, etc., and to consider stable sintered dimensional change rate to meet the requirement of the mold applicability principle in the metallurgical product factory.
Disclosure of Invention
The invention aims to solve the technical problem of providing a preparation method of special mixed powder for automobile gear hubs, overcoming the defects of the prior art and giving consideration to performance indexes such as good mechanical property, compressibility, sintering dimensional stability and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of special mixed powder for automobile gear hubs comprises the steps of firstly preparing molybdenum pre-alloyed steel powder, reducing the molybdenum pre-alloyed steel powder, adding nickel powder and copper powder, mixing, and diffusing to form first-step master alloy powder; adding nickel powder into the first-step master alloy powder, mixing to form second-step master alloy powder, adding graphite powder, manganese sulfide powder and a lubricant into the second-step master alloy, and forming special mixed powder for the automobile gear hub by segregation-free mixing and bonding; the method comprises the following specific steps:
1) preparation of molybdenum pre-alloyed steel powder
2) First-step preparation of alloy master powder: reducing the molybdenum pre-alloyed steel powder by a reducing furnace at the temperature of 840-980 ℃; adding nickel powder and copper powder into the reduced molybdenum pre-alloyed steel powder, mixing, uniformly mixing, and then diffusing through a reducing furnace, wherein the addition amount of the nickel powder is 2.0-3.5% and the addition amount of the copper powder is 1.5-1.80% in percentage by weight, and the diffusion temperature is controlled at 750-850 ℃; forming alloy master powder, and crushing, screening, batching and detecting the alloy master powder to prepare the first-step alloy master powder;
3) preparing alloy mother powder in the second step: adding nickel powder into the alloy master powder in the first step, wherein the nickel powder is added in an amount of 0.5-3.5% by weight, and mixing for 20-30 minutes to form alloy master powder in the second step;
4) graphite powder, manganese sulfide powder and a lubricant are added into the alloy mother powder in the second step, and the adding amount of graphite in percentage by weight is 0.50-0.90%; the addition amount of the manganese sulfide powder is 0.3-0.7%; the adding amount of the lubricant is 0.5-0.8%, and the mixture is mixed for 80-100 minutes; sampling and detecting various indexes, and packaging to obtain the finished product.
The preparation method of the molybdenum prealloyed steel powder in the step 1) comprises the following steps:
a. smelting: smelting in an electric furnace to obtain molybdenum pre-alloyed molten steel, wherein the tapping temperature is more than or equal to 1600 ℃, and the molybdenum content is required to be 0.80-1.0%;
b. atomizing: atomizing molten steel in a water atomization system, wherein the atomization pressure is 6-16 Mpa, dehydrating and drying the atomized molten steel to obtain water atomized alloy powder, and the drying temperature is 110-300 ℃;
c. reduction: reducing the water atomized alloy powder by a reducing furnace to obtain iron-molybdenum powder, wherein the temperature of a reducing preheating section of the reducing furnace is 550-700 ℃, the temperature of a high temperature section of the reducing furnace is 840-980 ℃, the temperature of a cooling section of the reducing furnace is 500-8, the temperature of the cooling section of the reducing furnace is 40 ℃, and the hydrogen flow is 50-190 m3H, running speed: 90-300 mm/min, and the thickness of the material layer: 12-48 mm;
d. annealing: and annealing the iron-molybdenum powder, and then crushing, screening and batching to form the molybdenum prealloying steel powder containing 0.80-1.0% of molybdenum.
The performance of the water atomized alloy powder is as follows: apparent density: 2.95-3.15g/cm3(ii) a The particle size composition is as follows: the particle size is less than or equal to 63 mu m: 31-40%; less than or equal to 0.15 percent of acid insoluble substances and less than or equal to 1.5 percent of hydrogen loss.
The molybdenum pre-alloyed steel powder comprises the following chemical components in percentage by weight: 0.01 to 0.015 percent of C, less than or equal to 0.050 percent of Si,P is less than or equal to 0.015 percent, S is less than or equal to 0.020 percent, Mo: 0.80-1.0%; the balance being iron; the physical properties and the granularity are as follows: apparent density: 2.95-3.15g/cm3(ii) a The particle size is less than or equal to 63 mu m: 31 to 40 percent.
The first step of alloy master powder comprises the following chemical components in percentage by weight: less than or equal to 0.01 percent of C, less than or equal to 0.050 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.020 percent of S, Mo: 0.80-1.0%, Ni: 2.0-3.5%, Cu: 1.5-1.80% and the balance of iron.
The second step is chemical composition and physical property of alloy mother powder: less than or equal to 0.01 percent of C, less than or equal to 0.050 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.020 percent of S, Mo: 0.80-1.0%, Ni: 4.0-5.5%, Cu: 1.5-1.80% of iron, the balance being iron; the apparent density is 2.95-3.05 g/cm3Compressibility not less than 7.05g/cm3。
The chemical components and the performances of the special mixed powder for the automobile gear hubs are as follows: the chemical components by weight percentage are as follows: c: 0.50-0.90%; si: less than or equal to 0.050 percent; mn: 0.17-0.21%; p: less than or equal to 0.015 percent; s: less than or equal to 0.020%; mo: 0.80-1.0%, Ni: 4.0-5.5%, Cu: 1.5-1.80%, and the balance of Fe and inevitable impurities; apparent density: 3.0 to 3.3g/cm3Compressibility not less than 7.03g/cm3(die wall lubrication) and the flow rate is less than or equal to 38s/50 g.
Compared with the prior art, the invention has the beneficial effects that:
the compressibility (600MPa) of the mixed iron powder produced by the invention is more than or equal to 7.03g/cm3The apparent hardness HV10 is more than or equal to 300, the alloy element molybdenum is pre-alloyed by molten steel, the alloy element Cu is added into the base powder in a diffusion mode, the alloy element Ni is added into the base powder in a partial diffusion mode, and part of the alloy element Ni is directly added, so that the high strength of the product is ensured, the apparent hardness of the product is ensured, the fluctuation of the sintering size is stabilized, and the mechanical property of the product is improved.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
Examples
A preparation method of special mixed powder for automobile gear hubs comprises the following specific steps:
1) preparation of molybdenum pre-alloyed steel powder
a. Smelting: smelting in an electric furnace to obtain molybdenum pre-alloyed molten steel, wherein the tapping temperature is more than or equal to 1600 ℃, and the molybdenum content is required to be 0.80-1.0%;
b. atomizing: atomizing molten steel in a water atomization system, wherein the atomization pressure is 6-16 Mpa, dehydrating and drying the atomized molten steel to obtain water atomized alloy powder, and the drying temperature is 110-300 ℃; performance of the water atomized alloy powder: apparent density: 2.95-3.15g/cm3(ii) a The particle size composition is as follows: the particle size is less than or equal to 63 mu m: 31-40%; acid insoluble substance is less than or equal to 0.15 percent, and hydrogen loss is less than or equal to 1.5 percent;
c. reduction: reducing the water atomized alloy powder by a reducing furnace to obtain iron-molybdenum powder, wherein the temperature of a reducing preheating section of the reducing furnace is 550-700 ℃, the temperature of a high temperature section of the reducing furnace is 840-980 ℃, the temperature of a cooling section of the reducing furnace is 500-8, the temperature of the cooling section of the reducing furnace is 40 ℃, and the hydrogen flow is 50-190 m3H, running speed: 90-300 mm/min, and the thickness of the material layer: 12-48 mm;
d. annealing: and annealing the iron-molybdenum powder, and then crushing, screening and batching to form the molybdenum prealloying steel powder containing 0.80-1.0% of molybdenum.
The molybdenum pre-alloyed steel powder comprises the following chemical components in percentage by weight: 0.01-0.015% of C, less than or equal to 0.050% of Si, less than or equal to 0.015% of P, less than or equal to 0.020% of S, and Mo: 0.80-1.0% of iron, and the balance of iron; the physical properties and the granularity are as follows: apparent density: 2.95-3.15g/cm3(ii) a The particle size is less than or equal to 63 mu m: 31 to 40 percent.
2) First-step preparation of alloy master powder: reducing the molybdenum pre-alloyed steel powder by a reducing furnace at the reduction temperature of 980 ℃; adding nickel powder and copper powder into the reduced molybdenum pre-alloyed steel powder for mixing, uniformly mixing according to the weight percentage of 2.75 percent of the addition of the nickel powder and 1.65 percent of the addition of the copper powder, and then diffusing the mixture through a reducing furnace, wherein the diffusion temperature is controlled at 750-850 ℃; forming alloy master powder, and crushing, screening, batching and detecting the alloy master powder to prepare the first-step alloy master powder;
the chemical components of the alloy master powder in the first step are shown in a table 1, and the granularity composition is shown in a table 2;
table 1: chemical composition (%)
| C | Si | Mn | P | S | Mo | Ni | Cu | Insolubilization with acids |
| 0.002 | 0.031 | 0.11 | 0.010 | 0.013 | 0.92 | 3.0 | 1.60 | 0.058 |
Table 2: particle size composition (%)
The loose packing density of the alloy master powder in the first step is 2.95g/cm3
3) Preparing alloy mother powder in the second step: adding nickel powder into the first-step alloy master powder, wherein the nickel powder is added in an amount of 2.75 percent by weight, and mixing for 30 minutes to form second-step alloy master powder;
the chemical components of the alloy master powder in the second step are shown in a table 3, and the granularity composition is shown in a table 4;
table 3: chemical composition%
| C | Si | Mn | P | S | Mo | Ni | Cu | Insolubilization with acids |
| 0.003 | 0.022 | 0.14 | 0.006 | 0.006 | 0.85 | 5.3 | 1.75 | 0.070 |
Table 4: the particle size composition%
| μm | ＞180 | 180-150 | 150-100 | 100-63 | -63 |
| 0.1 | 3.4 | 34.5 | 28.9 | 33.1 |
The loose density of the alloy master powder in the second step is 3.05g/cm3Compressibility of more than or equal to 7.07g/cm3(die wall lubrication).
4) Graphite powder, manganese sulfide powder and a lubricant are added into the alloy mother powder in the second step, and the adding amount of graphite in percentage by weight is 0.70%; the addition amount of the manganese sulfide powder is 0.6 percent; the adding amount of the lubricant is 0.8%, and the mixture is mixed for 80-100 minutes; sampling and detecting various indexes, and packaging to obtain the finished product.
The chemical components of the finished mixed powder comprise the following components in percentage by weight:
c: 0.55 percent; si: 0.020%; mn: 0.13 percent; p: less than or equal to 0.007%; s: 0.008 percent; mo: 0.88%, Ni 5.3%, Cu: 1.75 percent, and the balance of Fe and inevitable impurities.
Physical properties: apparent density: 3.18g/cm3Compressibility: 7.07g/cm3(die wall lubrication), flow rate: 36.1s/50g, apparent hardness HV 10: 375.
Claims (7)
1. a preparation method of special mixed powder for automobile gear hubs is characterized in that molybdenum pre-alloyed steel powder is prepared, then the molybdenum pre-alloyed steel powder is reduced and added with nickel powder and copper powder to be mixed and diffused to form first-step master alloy powder; adding nickel powder into the first-step master alloy powder, mixing to form second-step master alloy powder, adding graphite powder, manganese sulfide powder and a lubricant into the second-step master alloy, and forming special mixed powder for the automobile gear hub by segregation-free mixing and bonding; the method comprises the following specific steps:
1) preparation of molybdenum pre-alloyed steel powder
2) First-step preparation of alloy master powder: reducing the molybdenum pre-alloyed steel powder by a reducing furnace at the temperature of 840-980 ℃; adding nickel powder and copper powder into the reduced molybdenum pre-alloyed steel powder, mixing, uniformly mixing, and then diffusing through a reducing furnace, wherein the addition amount of the nickel powder is 2.0-3.5% and the addition amount of the copper powder is 1.5-1.80% in percentage by weight, and the diffusion temperature is controlled at 750-850 ℃; forming alloy master powder, and crushing, screening, batching and detecting the alloy master powder to prepare the first-step alloy master powder;
3) preparing alloy mother powder in the second step: adding nickel powder into the alloy master powder in the first step, wherein the nickel powder is added in an amount of 0.5-3.5% by weight, and mixing for 20-30 minutes to form alloy master powder in the second step;
4) graphite powder, manganese sulfide powder and a lubricant are added into the alloy mother powder in the second step, and the adding amount of graphite in percentage by weight is 0.50-0.90%; the addition amount of the manganese sulfide powder is 0.3-0.7%; the adding amount of the lubricant is 0.5-0.8%, and the mixture is mixed for 80-100 minutes; sampling and detecting various indexes, and packaging to obtain the finished product.
2. The preparation method of the special mixed powder for the gear hubs for the automobiles according to claim 1, wherein the preparation method of the molybdenum pre-alloyed steel powder in the step 1) comprises the following steps:
a. smelting: smelting in an electric furnace to obtain molybdenum pre-alloyed molten steel, wherein the tapping temperature is more than or equal to 1600 ℃, and the molybdenum content is required to be 0.80-1.0%;
b. atomizing: atomizing molten steel in a water atomization system, wherein the atomization pressure is 6-16 Mpa, dehydrating and drying the atomized molten steel to obtain water atomized alloy powder, and the drying temperature is 110-300 ℃;
c. reduction: reducing the water atomized alloy powder by a reducing furnace to obtain iron-molybdenum powder, wherein the temperature of a reducing preheating section of the reducing furnace is 550-700 ℃, the temperature of a high temperature section of the reducing furnace is 840-980 ℃, the temperature of a cooling section of the reducing furnace is 500-8, the temperature of the cooling section of the reducing furnace is 40 ℃, and the hydrogen flow is 50-190 m3H, running speed: 90-300 mm/min, and the thickness of the material layer: 12-48 mm;
d. annealing: and annealing the iron-molybdenum powder, and then crushing, screening and batching to form the molybdenum prealloying steel powder containing 0.80-1.0% of molybdenum.
3. The preparation method of the special mixed powder for the automobile gear hubs according to claim 1, wherein the water atomized alloy powder has the following properties: apparent density: 2.95-3.15g/cm3(ii) a The particle size composition is as follows: the particle size is less than or equal to 63 mu m: 31-40%; less than or equal to 0.15 percent of acid insoluble substances and less than or equal to 1.5 percent of hydrogen loss.
4. The preparation method of the special mixed powder for the gear hubs for the automobiles according to claim 1, wherein the chemical components of the molybdenum pre-alloyed steel powder comprise the following components in percentage by weight: 0.01-0.015% of C, less than or equal to 0.050% of Si, less than or equal to 0.015% of P, less than or equal to 0.020% of S, and Mo: 0.80-1.0%; the balance being iron; the physical properties and the granularity are as follows: apparent density: 2.95-3.15g/cm3(ii) a The particle size is less than or equal to 63 mu m: 31 to 40 percent.
5. The preparation method of the special mixed powder for the gear hubs for the automobiles according to claim 1, wherein the alloy master powder in the first step comprises the following chemical components in percentage by weight: less than or equal to 0.01 percent of C, less than or equal to 0.050 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.020 percent of S, Mo: 0.80-1.0%, Ni: 2.0-3.5%, Cu: 1.5-1.80% and the balance of iron.
6. The preparation method of the special mixed powder for the gear hubs for the automobiles according to claim 1, wherein the alloy master powder in the second step comprises the following chemical components and physical properties: less than or equal to 0.01 percent of C, less than or equal to 0.050 percent of Si, less than or equal to 0.015 percent of P, less than or equal to 0.020 percent of S, Mo: 0.80-1.0%, Ni: 4.0-5.5%, Cu: 1.5-1.80% of iron, the balance being iron; the apparent density is 2.95-3.05 g/cm3Compressibility not less than 7.05g/cm3。
7. The chemical components and the properties of the special mixed powder for the gear hubs for the automobiles prepared by the method according to claim 1 are as follows: the chemical components by weight percentage are as follows: c: 0.50-0.90%; si: less than or equal to 0.050 percent; mn: 0.17-0.21%; p: less than or equal to 0.015 percent; s: less than or equal to 0.020%; mo: 0.80-1.0%, Ni: 4.0-5.5%, Cu: 1.5-1.80%, and the balance of Fe and inevitable impurities; apparent density: 3.0 to 3.3g/cm3Compressibility not less than 7.03g/cm3(die wall lubrication) and the flow rate is less than or equal to 38s/50 g.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11798754B2 (en) | 2019-09-12 | 2023-10-24 | Omron Corporation | Electronic apparatus, contactless switch, and photoelectric sensor comprising a housing with a substrate holding part for fixing one or more substrates to a predetermined position |
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| CN112410657A (en) * | 2020-09-23 | 2021-02-26 | 山东鲁银新材料科技有限公司 | Powder metallurgy composition for high-performance automobile synchronizer gear hub and preparation method thereof |
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