CN114182179A - High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof - Google Patents
High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof Download PDFInfo
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- CN114182179A CN114182179A CN202111520613.4A CN202111520613A CN114182179A CN 114182179 A CN114182179 A CN 114182179A CN 202111520613 A CN202111520613 A CN 202111520613A CN 114182179 A CN114182179 A CN 114182179A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 48
- 239000010959 steel Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 title claims abstract description 23
- 238000005496 tempering Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 17
- 238000005096 rolling process Methods 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 238000009849 vacuum degassing Methods 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 229910052758 niobium Inorganic materials 0.000 abstract description 5
- 229910052719 titanium Inorganic materials 0.000 abstract description 5
- 229910052720 vanadium Inorganic materials 0.000 abstract description 5
- 238000003723 Smelting Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000006477 desulfuration reaction Methods 0.000 abstract description 3
- 230000023556 desulfurization Effects 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 238000010583 slow cooling Methods 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000003749 cleanliness Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 229910052750 molybdenum Inorganic materials 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides high-strength bucket tooth steel for engineering machinery and a production method and a heat treatment process thereof, and the high-strength bucket tooth steel comprises the following components: c: 0.31% -0.36%; si: 1.10% -1.35%; cr: 1.00% -1.35%; mn: 0.90-1.10 percent of Al, 0.015-0.045 percent of Al; the balance being Fe and unavoidable impurities. Compared with the prior art, the content of harmful elements such as P, S is less than 0.020%, excessive dephosphorization and desulfurization are not needed, and the pressure on smelting is low. No fine crystal elements such as Nb, V, Ti and the like are added, the alloy consumption is reduced, and the production cost is low. The heat treatment adopts a low-temperature tempering process, so that the energy consumption of the heat treatment is reduced. The yield strength of the product is more than or equal to 1500MPa, the tensile strength is more than or equal to 1800MPa, and the higher yield and tensile strength ensures that the bucket teeth are not easy to deform and break in a severe working environment.
Description
Technical Field
The invention belongs to steel materials, and particularly relates to high-strength bucket tooth steel for engineering machinery, a production method and a heat treatment process thereof.
Background
The bucket tooth is an important part of engineering machinery such as an excavator, a bulldozer and the like, is in direct contact with ores, gravels, concrete and the like during work, bears strong impact, bending and grinding, and is one of the most serious parts.
The common bucket teeth are mainly cast high-speed steel, and Cr, V, Ti, Mo, Nb or RE elements can also be added for modification. The method has the advantages of simple production process, unstable product quality, low production efficiency, prominent production environment problem and great influence by national environmental protection policy. Compared with a casting production method, the forging bucket tooth has the advantages of stable raw materials, more uniform and fine forged tissues, stable product quality, high production efficiency and small environmental pollution. Accordingly, tooth products have evolved from casting teeth to forging teeth.
However, in order to improve the strength of conventional bucket tooth steel, elements such as Cr, V, Ti, Mo, Nb, or RE are added in large amounts, which increases the cost.
Disclosure of Invention
The invention aims to provide high-strength bucket tooth steel for engineering machinery and a production method thereof, and the hot-rolled round steel for high-strength forging bucket teeth provided by the invention has the main elements of C, Si, Mn and Cr, does not need to add fine crystal elements such as V, Nb, Ti and the like, is low in cost and simple in production process, and meets the product performance requirements.
The invention also aims to provide a heat treatment method of the high-strength bucket tooth steel for the engineering machinery, and the high-strength bucket tooth steel for the engineering machinery can obtain high-hardness and high-toughness mechanical properties by being treated by the heat treatment process.
The specific technical scheme of the invention is as follows:
the high-strength bucket tooth steel for the engineering machinery comprises the following components in percentage by mass:
c: 0.31% -0.36%; si: 1.10% -1.35%; cr: 1.00% -1.35%; mn: 0.90-1.10 percent of Al, 0.015-0.045 percent of Al; the balance being Fe and unavoidable impurities.
Furthermore, in the components of the high-strength bucket tooth steel for the engineering machinery, P is controlled to be less than or equal to 0.020% and S is controlled to be less than or equal to 0.020%. P, S are considered harmful elements in this steel, and too much P, S adversely affects the quality of the product and the processing. P is less than or equal to 0.020 percent and S is less than or equal to 0.020 percent, which meets the requirement and does not need to be strictly controlled.
The invention provides a production method of high-strength bucket tooth steel for engineering machinery, which comprises the following process flows of:
blast furnace molten iron-converter-LF refining-RH vacuum degassing-continuous casting-hot rolling;
in the blast furnace molten iron process, the used raw materials are molten iron and scrap steel, attention is paid to the types of the scrap steel, and alloy elements are reduced; mainly avoids adding scrap steel containing Cu, Pb and the like, otherwise, the problem of cracks is easy to occur.
The converter controls the tapping C of the converter to be more than or equal to 0.010 percent, the tapping P to be less than or equal to 0.015 percent and the tapping temperature to be more than or equal to 1630 ℃.
Adding slag and alloy in the converter tapping process;
in the LF refining, the LF refining time is controlled to be more than or equal to 40min, a proper amount of lime and a slag melting agent are added to ensure the foamability and the fluidity of the refining slag, and the refining time of the white slag is more than or equal to 20 min;
the addition amount of lime is 2.2-3.9Kg/t steel;
the slag melting agent is added discontinuously for a plurality of times according to the foamability and the fluidity of the slag.
The RH vacuum degassing is carried out, the RH deep vacuum time is more than or equal to 15min, and the soft blowing time is more than or equal to 15 min;
the secondary cooling ratio water is 0.25L/Kg;
the continuous casting blank is phi 300mm, and the rolling specification is determined according to the requirements of bucket tooth manufacturers.
The hot rolling is carried out, specifically, the heating time of steel rolling in a furnace is more than or equal to 240min, and the rolling temperature is 1100 +/-20 ℃;
too low initial rolling temperature can affect dephosphorization effect and rolling; the excessive initial rolling temperature wastes production energy and is easy to cause quality accidents of overheating and overburning.
After hot rolling, controlling the cooling speed after rolling, wherein the cooling speed is not more than 1 ℃/s; slowly cooling at the temperature of not lower than 450 ℃, wherein the slow cooling aims to reduce fast cooling structures and thermal stress, and slowly cooling to below 200 ℃ to get out of a slow cooling pit.
The hot rolled structure of the high-strength bucket tooth steel for the engineering machinery is pearlite and ferrite, and the grain size is more than or equal to grade 6.
The invention provides a heat treatment process of high-strength bucket tooth steel for engineering machinery, which comprises the following specific steps:
quenching at 880 +/-15 ℃ and tempering at 250 +/-20 ℃.
And water cooling or air cooling after tempering.
The product of the high-strength bucket tooth steel for the engineering machinery has the following properties after heat treatment: the yield strength is more than or equal to 1500MPa, the tensile strength is more than or equal to 1800MPa, the elongation is more than or equal to 9 percent, the reduction of area is more than or equal to 40 percent, and the room temperature Aku2 is more than or equal to 60J.
After the product of the high-strength bucket tooth steel for the engineering machinery is subjected to heat treatment, the structure is tempered martensite.
The design idea of the invention is as follows:
c: the main elements for ensuring the strength and the hardness of the bucket tooth steel, the content of 0.31-0.36% can ensure that the bucket tooth achieves ideal strength and hardness after heat treatment, can reduce the tendency of deformation and cracking of the heat treatment, and can not influence the welding performance of the bucket tooth.
Si: the elastic limit of the bucket tooth steel can be obviously improved, the strength is improved, and the deoxidation effect can be realized in the smelting process, so that the cleanliness of the steel is improved.
Cr can improve the hardenability of the bucket tooth steel, has a fine grain effect with carbide, and improves the strength of the bucket tooth.
Mn: the method can obviously improve the hardenability of the steel, has good effects of improving the strength and the hardness, and can play roles of deoxidation and desulfurization in the smelting process to improve the cleanliness of the steel.
Al: the invention can refine crystal grains by proper amount of Al.
Compared with the prior art, the content of harmful elements such as P, S is less than 0.020%, excessive dephosphorization and desulfurization are not needed, and the pressure on smelting is low. No fine crystal elements such as Nb, V, Ti and the like are added, the alloy consumption is reduced, and the production cost is low. The heat treatment adopts a low-temperature tempering process, so that the energy consumption of the heat treatment is reduced. The product has yield strength of more than or equal to 1500MPa, tensile strength of more than or equal to 1800MPa, elongation of more than or equal to 9 percent and reduction of area of more than or equal to 40 percent; the impact work is more than or equal to 60J; the bucket teeth are not easy to deform and break in a severe working environment due to high yield and tensile strength.
Detailed Description
Example 1 to example 11
The high-strength bucket tooth steel for the engineering machinery comprises the following components in percentage by mass: as shown in table 1, the balance not shown in table 1 is Fe and inevitable impurities.
Table 1 shows the compositions (wt%) of the bucket tooth steels of examples and comparative examples
| Examples | C | Si | Cr | Mn | Al | P | S |
| Example 1 | 0.35 | 1.249 | 1.26 | 0.94 | 0.021 | 0.016 | 0.003 |
| Example 2 | 0.34 | 1.241 | 1.25 | 0.94 | 0.022 | 0.018 | 0.005 |
| Example 3 | 0.35 | 1.204 | 1.22 | 0.94 | 0.020 | 0.016 | 0.002 |
| Example 4 | 0.35 | 1.278 | 1.26 | 0.95 | 0.022 | 0.014 | 0.004 |
| Example 5 | 0.35 | 1.275 | 1.26 | 0.94 | 0.022 | 0.013 | 0.002 |
| Example 6 | 0.35 | 1.240 | 1.24 | 0.93 | 0.015 | 0.016 | 0.007 |
| Example 7 | 0.35 | 1.234 | 1.26 | 0.95 | 0.025 | 0.012 | 0.004 |
| Example 8 | 0.36 | 1.245 | 1.26 | 0.93 | 0.020 | 0.015 | 0.005 |
| Example 9 | 0.35 | 1.206 | 1.23 | 0.94 | 0.017 | 0.015 | 0.004 |
| Example 10 | 0.34 | 1.230 | 1.22 | 0.94 | 0.021 | 0.018 | 0.002 |
| Example 11 | 0.35 | 1.282 | 1.24 | 0.96 | 0.022 | 0.015 | 0.001 |
The production process of the bucket tooth steel of each embodiment and the comparative example is as follows: blast furnace molten iron-converter-LF refining-RH vacuum degassing-continuous casting-hot rolling;
in the blast furnace molten iron process, the used raw materials are molten iron and scrap steel, attention is paid to the types of the scrap steel, and alloy elements are reduced; mainly avoids adding scrap steel containing Cu, Pb and the like, otherwise, the problem of cracks is easy to occur.
The converter controls the tapping C of the converter to be more than or equal to 0.010 percent, the tapping P to be less than or equal to 0.015 percent and the tapping temperature to be more than or equal to 1630 ℃.
Adding slag and alloy in the converter tapping process;
in the LF refining, the LF refining time is controlled to be more than or equal to 40min, a proper amount of lime and a slag melting agent are added to ensure the foamability and the fluidity of the refining slag, and the refining time of the white slag is more than or equal to 20 min;
the addition amount of lime is 2.2-3.9Kg/t steel; 125 tons of steel are produced in each furnace;
the slag melting agent is added discontinuously for a plurality of times according to the foamability and the fluidity of the slag.
The RH vacuum degassing is carried out, the RH deep vacuum time is more than or equal to 15min, and the soft blowing time is more than or equal to 15 min;
the secondary cooling ratio water is 0.25L/Kg;
the continuous casting blank is phi 300mm, and the rolling specification is determined according to the requirements of bucket tooth manufacturers.
The hot rolling is carried out, specifically, the heating time of steel rolling in a furnace is more than or equal to 240min, and the rolling temperature is 1100 +/-20 ℃;
too low initial rolling temperature can affect dephosphorization effect and rolling; the excessive initial rolling temperature wastes production energy and is easy to cause quality accidents of overheating and overburning.
After hot rolling, controlling the cooling speed after rolling, wherein the cooling speed is not more than 1 ℃/s; slowly cooling at the temperature of not lower than 450 ℃, wherein the slow cooling aims to reduce fast cooling structures and thermal stress, and slowly cooling to below 200 ℃ to get out of a slow cooling pit.
Specific process parameters for each example and comparative example are shown in table 2.
TABLE 2 production Process parameters of bucket tooth steels of examples and comparative examples
The heat treatment process of the high-strength bucket tooth steel for the engineering machinery produced in each embodiment and the comparative example comprises the following specific processes: quenching at 880 +/-15 ℃ and tempering at 250 +/-20 ℃. Specific process parameters for each example and comparative example are shown in table 3.
TABLE 3 Heat treatment Process for examples and comparative examples
The properties of the products produced in the above examples and comparative examples are shown in Table 4, and 2 samples were taken from each example and examined. Tensile test method GB/T228.1; impact test method GB/T229.
TABLE 4 Properties of the products of the examples and comparative examples
The product has yield strength of more than or equal to 1500MPa, tensile strength of more than or equal to 1800MPa, elongation of more than or equal to 9 percent and reduction of area of more than or equal to 40 percent; the impact work is more than or equal to 60J; the bucket teeth are not easy to deform and break in a severe working environment due to high yield and tensile strength.
Claims (10)
1. The high-strength bucket tooth steel for the engineering machinery is characterized by comprising the following components in percentage by mass:
c: 0.31% -0.36%; si: 1.10% -1.35%; cr: 1.00% -1.35%; mn: 0.90-1.10 percent of Al, 0.015-0.045 percent of Al; the balance being Fe and unavoidable impurities.
2. The high-strength bucket tooth steel for engineering machinery as claimed in claim 1, wherein P is controlled to be less than or equal to 0.020% and S is controlled to be less than or equal to 0.020% in the composition of the high-strength bucket tooth steel for engineering machinery.
3. The production method of the high-strength bucket tooth steel for the engineering machinery as claimed in claim 1 or 2, characterized by comprising the following process flows of:
blast furnace molten iron-converter-LF refining-RH vacuum degassing-continuous casting-hot rolling.
4. The production method of claim 3, wherein the converter controls the tapping temperature of the converter to be more than or equal to 0.010% C, less than or equal to 0.015% P and more than or equal to 1630 ℃.
5. The production method of claim 3, wherein in the LF refining, the LF refining time is controlled to be more than or equal to 40min, and the white slag refining time is controlled to be more than or equal to 20 min.
6. The production method according to claim 3, wherein the RH vacuum degassing is performed for 15min or more in RH deep vacuum time and 15min or more in soft blowing time.
7. The production method according to claim 3, wherein the continuous casting, the continuous casting protective casting and the secondary cooling ratio water are 0.25L/Kg.
8. The production method according to claim 3, wherein the hot rolling, in particular, the heating of the rolled steel in the furnace for more than or equal to 240min and the rolling temperature of 1100 +/-20 ℃; after hot rolling, controlling the cooling speed to be not more than 1 ℃/s; slowly cooling at the temperature of not lower than 450 ℃.
9. The heat treatment method of the high-strength bucket tooth steel for the engineering machinery as claimed in claim 1 or 2, which is characterized by comprising the following specific processes: quenching at 880 +/-15 ℃ and tempering at 250 +/-20 ℃.
10. The heat treatment method of the high-strength bucket tooth steel for the engineering machinery as claimed in claim 1 or 2, wherein after the heat treatment, the product performance is as follows: the yield strength is more than or equal to 1500MPa, the tensile strength is more than or equal to 1800MPa, the elongation is more than or equal to 9 percent, the reduction of area is more than or equal to 40 percent, and the room temperature Aku2 is more than or equal to 60J.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875315A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Low-alloy steel for excavator bucket teeth and production method thereof |
| CN115627427A (en) * | 2022-10-27 | 2023-01-20 | 南京钢铁股份有限公司 | Steel for excavator forging bucket teeth and preparation method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN110343952A (en) * | 2019-07-02 | 2019-10-18 | 唐山中厚板材有限公司 | A kind of hardness is not less than the wear-resisting steel plate and its production method of 600HBW |
| CN110846474A (en) * | 2019-12-24 | 2020-02-28 | 三一重机有限公司 | Heat treatment process method of excavator bucket teeth |
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2021
- 2021-12-13 CN CN202111520613.4A patent/CN114182179A/en active Pending
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| JPH02179844A (en) * | 1988-12-30 | 1990-07-12 | Aichi Steel Works Ltd | Wear resistant alloy steel |
| JP2007146237A (en) * | 2005-11-28 | 2007-06-14 | Nippon Steel Corp | Heat-treatment method for bainite steel rail |
| CN102517513A (en) * | 2012-01-12 | 2012-06-27 | 承德建龙特殊钢有限公司 | Steel for high-strength, corrosion-resistant and high-anti-seismic-performance hydraulic supporting column and preparation process thereof |
| CN102758067A (en) * | 2012-06-29 | 2012-10-31 | 暨南大学 | Thermal treatment method for wear-resistant low alloy steel |
| CN110343952A (en) * | 2019-07-02 | 2019-10-18 | 唐山中厚板材有限公司 | A kind of hardness is not less than the wear-resisting steel plate and its production method of 600HBW |
| CN110846474A (en) * | 2019-12-24 | 2020-02-28 | 三一重机有限公司 | Heat treatment process method of excavator bucket teeth |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114875315A (en) * | 2022-04-26 | 2022-08-09 | 湖南华菱湘潭钢铁有限公司 | Low-alloy steel for excavator bucket teeth and production method thereof |
| CN115627427A (en) * | 2022-10-27 | 2023-01-20 | 南京钢铁股份有限公司 | Steel for excavator forging bucket teeth and preparation method thereof |
| WO2024087788A1 (en) * | 2022-10-27 | 2024-05-02 | 南京钢铁股份有限公司 | Steel for forged bucket teeth of excavator, and preparation method therefor |
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