CN117512431A - High-strength gray cast iron and production process and application thereof - Google Patents
High-strength gray cast iron and production process and application thereof Download PDFInfo
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- CN117512431A CN117512431A CN202311530680.3A CN202311530680A CN117512431A CN 117512431 A CN117512431 A CN 117512431A CN 202311530680 A CN202311530680 A CN 202311530680A CN 117512431 A CN117512431 A CN 117512431A
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- cast iron
- gray cast
- strength gray
- strength
- inoculant
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- 229910001060 Gray iron Inorganic materials 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 79
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 229910001018 Cast iron Inorganic materials 0.000 claims abstract description 6
- 229910052742 iron Inorganic materials 0.000 claims description 33
- 239000002245 particle Substances 0.000 claims description 26
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 16
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 16
- 229910052582 BN Inorganic materials 0.000 claims description 15
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 15
- 239000002054 inoculum Substances 0.000 claims description 15
- 239000000919 ceramic Substances 0.000 claims description 14
- 238000011081 inoculation Methods 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 4
- MIDOFQRPAXDZET-UHFFFAOYSA-N [Si].[Sr] Chemical compound [Si].[Sr] MIDOFQRPAXDZET-UHFFFAOYSA-N 0.000 claims description 2
- OOJQNBIDYDPHHE-UHFFFAOYSA-N barium silicon Chemical compound [Si].[Ba] OOJQNBIDYDPHHE-UHFFFAOYSA-N 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 5
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims 1
- 239000010949 copper Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 7
- 229910002804 graphite Inorganic materials 0.000 description 7
- 239000010439 graphite Substances 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 description 6
- 239000010941 cobalt Substances 0.000 description 6
- 229910017052 cobalt Inorganic materials 0.000 description 6
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 229910001309 Ferromolybdenum Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to the technical field of cast iron, and provides high-strength gray cast iron, a production process and application thereof, wherein the high-strength gray cast iron comprises the following components in percentage by weight: 3.70% -3.85% of C, 1.30% -1.50% of Si, 0.50% -0.80% of Mn, 0.25% -0.45% of Co, 0.15% -0.25% of Mo, 1.00% -1.40% of Cu, 0.05% -0.10% of B, 0.01% -0.03% of N, less than or equal to 0.08% of P, less than or equal to 0.06% of S, and the balance of Fe and other unavoidable impurities; the sum of the weight percentages of Co and Mo is more than or equal to 0.5 percent and less than or equal to 0.6 percent. Through the technical scheme, the problem of lower tensile strength of gray cast iron in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of cast iron, in particular to high-strength gray cast iron and a production process and application thereof.
Background
Gray cast iron is a cast iron with flake graphite, and is widely applied to the aspects of automobiles, engineering machinery and the like because of excellent shock absorption, lower notch sensitivity and higher wear resistance. However, the gray cast iron has coarse graphite flakes, and the stress concentration is very easy to occur at the graphite tip part, so that the cast iron processed by gray cast iron has lower tensile strength and is easy to crack and lose efficacy. With the development of production, the market places higher demands on the tensile strength of gray cast iron. Therefore, developing a high strength gray cast iron is of great importance.
Disclosure of Invention
The invention provides high-strength gray cast iron, a production process and application thereof, and solves the problem of lower tensile strength of gray cast iron in the related technology.
The technical scheme of the invention is as follows:
the invention provides high-strength gray cast iron, which comprises the following components in percentage by weight: 3.70% -3.85% of C, 1.30% -1.50% of Si, 0.50% -0.80% of Mn, 0.25% -0.45% of Co, 0.15% -0.25% of Mo, 1.00% -1.40% of Cu, 0.05% -0.10% of B, 0.01% -0.03% of N, less than or equal to 0.08% of P, less than or equal to 0.06% of S, and the balance of Fe and other unavoidable impurities;
the sum of the weight percentages of Co and Mo is more than or equal to 0.5 percent and less than or equal to 0.6 percent.
As a further technical scheme, the sum of the weight percentages of Co and Mo is 0.55%.
When the sum of the weight percentages of Co and Mo is 0.55%, gray cast iron has better excellent tensile strength.
The invention also provides a production process of the high-strength gray cast iron, which comprises the following steps:
s1, smelting: weighing raw materials according to each component of gray cast iron, and smelting to obtain molten iron;
s2, inoculation: pouring ceramic particles and inoculant into the molten iron, performing inoculation treatment, and adjusting components to obtain inoculated molten iron;
s3, casting: casting the inoculated molten iron to obtain gray cast iron;
the ceramic particles include silicon carbide and boron nitride.
As a further technical scheme, the mass ratio of the ceramic particles to the molten iron is 4-6:10000.
As a further technical scheme, the mass ratio of the silicon carbide to the boron nitride is 1-2:1.
When the mass ratio of the silicon carbide to the boron nitride is 1-2:1, the tensile strength of gray cast iron can be further improved.
As a further technical scheme, the particle sizes of the silicon carbide and the boron nitride are respectively 44-53 mu m independently.
As a further technical scheme, the inoculant is one of a ferrosilicon inoculant, a barium silicon inoculant and a strontium silicon inoculant.
As a further technical scheme, the mass ratio of the inoculant to the molten iron is 2-3:1000.
As a further technical scheme, after smelting, the molten iron is kept at 1530-1540 ℃ for 10-20 min.
As a further technical scheme, the temperature is 1400-1500 ℃ during inoculation.
As a further technical scheme, the temperature is 1370-1380 ℃ during casting.
The invention also provides application of the high-strength gray cast iron in an automobile cast iron product.
The working principle and the beneficial effects of the invention are as follows:
1. according to the invention, the pearlite refinement can be effectively promoted and the tensile strength of the gray cast iron can be enhanced by controlling the sum of the weight percentages of Co and Mo in the gray cast iron to be in the range of 0.5% -0.6%. When the sum of the weight percentages of Co and Mo is less than 0.5%, the pearlite refinement effect is not obvious; when the sum of the weight percentages of Co and Mo is more than 0.6%, gray cast iron is severely segregated, resulting in a decrease in tensile strength.
2. According to the invention, the silicon carbide and the boron nitride are introduced into the gray cast iron tissue, so that the effect of second-phase precipitation strengthening is achieved, the wetting angle of graphite is reduced, more heterogeneous nucleation points are provided for the graphite, the nucleation rate of the graphite is improved, the size of the graphite is reduced, and the tensile strength of the gray cast iron is further improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A production process of high-strength gray cast iron comprises the following steps:
s1, smelting: weighing waste iron (Fe 91.5 wt%), ferromanganese (Mn 81.3 wt%), pure cobalt (Mo 57.6 wt%), pure copper, ferrosilicon (Si 83.5 wt%), ferroboron (B16.4 wt%), and smelting according to the target components of gray cast iron to obtain molten iron;
s2, inoculation: after the molten iron is preserved for 20min at 1530 ℃,75SiFe inoculant is added into the molten iron, the molten iron is inoculated at 1400 ℃, and the ingredients are regulated to obtain inoculated molten iron;
wherein the mass ratio of the 75SiFe inoculant to the molten iron is 2:1000;
s3, casting: casting the inoculated molten iron at 1370 ℃ to obtain gray cast iron;
the gray cast iron comprises the following components in percentage by weight: 3.72% of C, 1.33% of Si, 0.51% of Mn, 0.26% of Co, 0.24% of Mo, 1.03% of Cu, 0.05% of B, 0.01% of N, 0.07% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities.
Example 2
A production process of high-strength gray cast iron comprises the following steps:
s1, smelting: weighing waste iron (Fe 91.5 wt%), ferromanganese (Mn 81.3 wt%), pure cobalt (Mo 57.6 wt%), pure copper, ferrosilicon (Si 83.5 wt%), ferroboron (B16.4 wt%), and smelting according to the target components of gray cast iron to obtain molten iron;
s2, inoculation: after the molten iron is kept at 1540 ℃ for 10min, 75SiFe inoculant is added into the molten iron, inoculation is carried out at 1500 ℃, and components are adjusted, so that inoculated molten iron is obtained;
wherein the mass ratio of the 75SiFe inoculant to the molten iron is 3:1000;
s3, casting: casting the inoculated molten iron at 1380 ℃ to obtain gray cast iron;
the gray cast iron comprises the following components in percentage by weight: 3.84% of C, 1.48% of Si, 0.79% of Mn, 0.45% of Co, 0.15% of Mo, 1.38% of Cu, 0.10% of B, 0.03% of N, 0.06% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities.
Example 3
This example differs from example 2 only in that in this example the gray cast iron consists of the following components in weight percent: 3.84% of C, 1.48% of Si, 0.79% of Mn, 0.25% of Co, 0.25% of Mo, 1.38% of Cu, 0.10% of B, 0.03% of N, 0.06% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities, and the addition amount of raw materials such as waste iron, ferromanganese, pure cobalt, ferromolybdenum, pure copper, ferrosilicon, ferroboron and the like is regulated according to the target component.
Example 4
This example differs from example 2 only in that in this example the gray cast iron consists of the following components in weight percent: 3.84% of C, 1.48% of Si, 0.79% of Mn, 0.30% of Co, 0.25% of Mo, 1.38% of Cu, 0.10% of B, 0.03% of N, 0.06% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities, and the addition amount of raw materials such as waste iron, ferromanganese, pure cobalt, ferromolybdenum, pure copper, ferrosilicon, ferroboron and the like is regulated according to the target component.
Example 5
The difference between this example and example 4 is that silicon carbide ceramic particles (particle diameter of 44 μm) were also poured into the molten iron during the inoculation treatment in this example;
wherein the mass ratio of the silicon carbide ceramic particles to the molten iron is 5:10000;
after inoculation, the gray cast iron is made up of the following components in percentage by weight by adjusting the components: 3.84% of C, 1.48% of Si, 0.79% of Mn, 0.30% of Co, 0.25% of Mo, 1.38% of Cu, 0.10% of B, 0.03% of N, 0.06% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities.
Example 6
The present example differs from example 5 only in that in this example, the ceramic particles are boron nitride (particle size 44 μm).
Example 7
The present example differs from example 5 only in that in this example, the ceramic particles consist of silicon carbide (particle size 44 μm) and boron nitride (particle size 44 μm) in a mass ratio of 1:2.
Example 8
The present example differs from example 5 only in that in this example, the ceramic particles consist of silicon carbide (particle size 44 μm) and boron nitride (particle size 44 μm) in a mass ratio of 3:1.
Example 9
The present example differs from example 5 only in that in this example, the ceramic particles consist of silicon carbide (particle size 44 μm) and boron nitride (particle size 44 μm) in a mass ratio of 1:1.
Example 10
The present example differs from example 5 only in that in this example, the ceramic particles consist of silicon carbide (particle size 44 μm) and boron nitride (particle size 44 μm) in a mass ratio of 2:1.
Comparative example 1
The present comparative example differs from example 1 only in that in this comparative example, the gray cast iron consists of the following components in weight percent: 3.72% of C, 1.33% of Si, 0.51% of Mn, 0.26% of Co, 0.15% of Mo, 1.03% of Cu, 0.05% of B, 0.01% of N, 0.07% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities, and the addition amount of raw materials such as waste iron, ferromanganese, pure cobalt, ferromolybdenum, pure copper, ferrosilicon, ferroboron and the like is regulated according to the target component.
Comparative example 2
The present comparative example differs from example 1 only in that in this comparative example, the gray cast iron consists of the following components in weight percent: 3.72% of C, 1.33% of Si, 0.51% of Mn, 0.45% of Co, 0.25% of Mo, 1.03% of Cu, 0.05% of B, 0.01% of N, 0.07% of P, 0.05% of S, and the balance of Fe and other unavoidable impurities, and the addition amount of raw materials such as waste iron, ferromanganese, pure cobalt, ferromolybdenum, pure copper, ferrosilicon, ferroboron and the like is regulated according to the target component.
The gray cast iron produced in examples 1 to 10 and comparative examples 1 to 2 was tested for tensile strength according to GB/T9439-2023 Gray cast iron, wherein the sample was a type A sample. The test results are shown in table 1 below.
Table 1 tensile strength test results
Comparison of example 1 and comparative examples 1-2 shows that gray cast iron has higher tensile strength when the sum of the weight percentages of Co and Mo is in the range of 0.5% -0.6%. Comparison of example 4 with examples 2-3 shows that gray cast iron possesses better excellent tensile strength when the sum of the weight percentages of Co and Mo is 0.55%. Comparison of example 4 with examples 5-10 shows that the tensile strength of gray cast iron can be further improved by introducing ceramic particles into the gray cast iron structure. Comparison of examples 5-6 with examples 7-10 shows that the tensile strength of gray cast iron can be further improved when the ceramic particles are composed of silicon carbide and boron nitride. Comparison of examples 7-8 and examples 9-10 shows that when the mass ratio of silicon carbide to boron nitride is 1-2:1, the tensile strength of gray cast iron can be further improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The high-strength gray cast iron is characterized by comprising the following components in percentage by weight: 3.70% -3.85% of C, 1.30% -1.50% of Si, 0.50% -0.80% of Mn, 0.25% -0.45% of Co, 0.15% -0.25% of Mo, 1.00% -1.40% of Cu, 0.05% -0.10% of B, 0.01% -0.03% of N, less than or equal to 0.08% of P, less than or equal to 0.06% of S, and the balance of Fe and other unavoidable impurities;
the sum of the weight percentages of Co and Mo is more than or equal to 0.5 percent and less than or equal to 0.6 percent.
2. The high strength gray cast iron of claim 1, wherein the sum of the weight percentages of Co and Mo is 0.55%.
3. The production process of the high-strength gray cast iron is characterized by comprising the following steps of:
s1, smelting: weighing raw materials for each component in the high-strength gray cast iron according to any one of claims 1-2, and smelting to obtain molten iron;
s2, inoculation: pouring ceramic particles and inoculant into the molten iron, performing inoculation treatment, and adjusting components to obtain inoculated molten iron;
s3, casting: casting the inoculated molten iron to obtain gray cast iron;
the ceramic particles include silicon carbide and boron nitride.
4. The production process of high-strength gray cast iron according to claim 3, wherein the mass ratio of the silicon carbide to the boron nitride is 1-2:1.
5. The process for producing high-strength gray cast iron according to claim 3, wherein the particle diameters of the silicon carbide and the boron nitride are 44-53 μm independently.
6. A process for producing high strength gray cast iron as claimed in claim 3, wherein said inoculant is one of a silicon iron inoculant, a silicon barium inoculant, and a silicon strontium inoculant.
7. The process for producing high-strength gray cast iron according to claim 3, wherein after the smelting, the molten iron is kept at 1530-1540 ℃ for 10-20 min.
8. The process for producing high-strength gray cast iron according to claim 3, wherein the temperature is 1400-1500 ℃ during the inoculation.
9. The process for producing high-strength gray cast iron according to claim 3, wherein the temperature is 1370-1380 ℃ during casting.
10. Use of the high-strength gray cast iron according to any one of claims 1 to 2 or produced by the production process of the high-strength gray cast iron according to any one of claims 3 to 9 in automotive cast iron products.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311530680.3A CN117512431A (en) | 2023-11-16 | 2023-11-16 | High-strength gray cast iron and production process and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311530680.3A CN117512431A (en) | 2023-11-16 | 2023-11-16 | High-strength gray cast iron and production process and application thereof |
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| CN117512431A true CN117512431A (en) | 2024-02-06 |
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| CN202311530680.3A Pending CN117512431A (en) | 2023-11-16 | 2023-11-16 | High-strength gray cast iron and production process and application thereof |
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|---|---|---|---|---|
| JPH07179984A (en) * | 1993-12-22 | 1995-07-18 | Toshiba Corp | Cast iron of high strength and low expansion and its production |
| JP2002194477A (en) * | 2000-12-26 | 2002-07-10 | Wakamatsu Seisakusho:Kk | Member for molten nonferrous metal |
| US20030024608A1 (en) * | 1997-10-14 | 2003-02-06 | Camcast Industries Pty., Ltd. | Iron alloy containing molybdenum |
| JP2007030037A (en) * | 2005-07-29 | 2007-02-08 | Jfe Steel Kk | Manufacturing method of cast iron article with excellent wear resistance |
| US20090081074A1 (en) * | 2007-06-07 | 2009-03-26 | Celso Antonio Barbosa | Wear resistant alloy for high temprature applications |
| CN102586668A (en) * | 2012-03-26 | 2012-07-18 | 天津一汽夏利汽车股份有限公司 | Coverage inoculator |
| CN104862610A (en) * | 2015-03-31 | 2015-08-26 | 上海惠北特种合金有限公司 | Novel austenite heat-resisting alloy material and manufacturing method thereof |
| CN108913985A (en) * | 2018-06-06 | 2018-11-30 | 东风商用车有限公司 | High-carbon-equivalent high-strength gray cast iron and preparation method thereof |
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| CN114054683A (en) * | 2021-11-30 | 2022-02-18 | 山西汤荣机械制造股份有限公司 | Preparation method of high-strength wear-resistant gray cast iron brake drum |
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-
2023
- 2023-11-16 CN CN202311530680.3A patent/CN117512431A/en active Pending
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|---|
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