CN112359292A - High-toughness steel for rotary blade and heat treatment method thereof - Google Patents
High-toughness steel for rotary blade and heat treatment method thereof Download PDFInfo
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- CN112359292A CN112359292A CN202011262059.XA CN202011262059A CN112359292A CN 112359292 A CN112359292 A CN 112359292A CN 202011262059 A CN202011262059 A CN 202011262059A CN 112359292 A CN112359292 A CN 112359292A
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- toughness
- steel
- rotary blade
- heat treatment
- heat preservation
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
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- 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
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- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Abstract
The invention discloses a high-toughness steel for a rotary blade and a heat treatment method thereof, wherein the steel comprises the following components in percentage by mass: c: 0.30-0.36%, Mn: 0.90-1.50%, Si: 0.20.-0.50%, B: 0.001-0.006 percent of Fe, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, and the balance of Fe and inevitable impurities; the heat treatment method comprises the following steps in sequence: quenching, heat preservation, water cooling, tempering and heat preservation. The invention improves the toughness and hardenability of the steel by adjusting the components, and simultaneously adopts the corresponding heat treatment process to improve the impact toughness of the rotary blade to 15-25J. The use requirements of the rotary tillage cutter of the high-toughness agricultural implement are met, and the production cost is low.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to high-toughness steel for a rotary blade for agricultural machinery and a heat treatment method thereof.
Background
Agricultural machinery is mostly operated in the open air, and the working environment is poor, and the service environment is comparatively abominable. The rotary tillage cutter is a key part and a vulnerable part of the rotary cultivator, directly carries out tillage and harrowing operation on cultivated land through forward and rotary motion, often contacts with soil, gravel, crop straws, root blocks and the like, the performance of the rotary tillage cutter directly influences the tillage quality and the operation efficiency of the rotary cultivator, and the rotary tillage cutter needs hardness and enough toughness. At present, main materials for manufacturing the rotary tillage cutter are generally 65Mn high-quality carbon structural steel and 60Si2Mn spring steel, and quenching and medium-temperature tempering are generally adopted, wherein the quenching temperature is as follows: 850 ℃ and 900 ℃, oil quenching, and tempering temperature: 400 ℃ and 450 ℃. The hardness of the blade is manufactured by heat treatment of the two materials: 45-55 HRC, has the characteristic of higher hardness value, but has the impact value of only 5-15J, and has the problem of lower impact toughness.
Chinese patent application 201910187480X discloses a rotary blade material and a preparation method thereof, wherein the alloy components of the rotary blade material contain Ni, V, Nb, Cr and the like, the alloy cost is high, the process is complex, and the production cost is high. In view of the foregoing, improvements are needed.
Disclosure of Invention
In view of the defects in the prior art, the invention provides the high-toughness steel for the rotary blade and the heat treatment method thereof, which have the characteristics of good toughness and low production cost while meeting the hardness requirement of the rotary blade.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the high-toughness steel for the rotary blade comprises the following chemical components in percentage by mass: c: 0.30-0.36%, Mn: 0.90-1.50%, Si: 0.20.-0.50%, B: 0.001-0.006%, S less than or equal to 0.02%, P less than or equal to 0.02%, and the balance of Fe and inevitable impurities.
The high-toughness steel for the rotary blade has a microstructure of tempered martensite and a decarburization depth of 0;
the high-toughness steel for the rotary blade has the hardness of 45-47HRC and the impact toughness of 15-20J;
the invention also provides a heat treatment method of the steel for the high-toughness rotary blade, which sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation.
The heat treatment method of the steel for the high-toughness rotary blade has the quenching temperature of 880 plus 920 ℃, heat preservation for 10-20min, water cooling to room temperature, tempering at 280 plus 320 ℃, and heat preservation for 15-25 min.
The action and mechanism of each main element of the invention are as follows:
considering that the steel for rotary blade of the present invention is required to ensure the mechanical properties of hardness and toughness on one hand, and considering the cost reduction on the other hand.
C: compared with 65Mn and 60Si2Mn materials, the rotary blade material of the invention reduces the content of C, the content of C is controlled within the range of 0.30-0.36%, C can be partially dissolved in the steel to play a role in solid solution strengthening, and part of C and alloy elements form alloy carbide. The proper amount of C content can improve the toughness of the steel, and simultaneously, the problem of surface decarburization of the heat treatment is avoided due to the reduction of the C content, and the decarburization depth of the microstructure of the rotary blade after the heat treatment is 0.
The content of B is more than 0.001 percent, which has the obvious effect of improving the hardenability of the steel, but the content of B once exceeds 0.006 percent, which has the effect of influencing the toughness of the steel, and the content of B is controlled to be 0.001 to 0.006 percent in the invention, which has the effect of increasing the hardenability and the strength and can meet the hardness requirement of the rotary blade.
Si: si is controlled within the range of 0.20-0.50%, and Si is a solid solution strengthening element, so that a macroscopic structure is more uniform, and the undercooling of components on a solidification interface during solidification can be reduced, so that the plasticity and the toughness are increased.
Mn: mn is controlled within the range of 0.90-1.50%, and Mn has the solid solution strengthening effect, so that the strength and hardness of ferrite and austenite are improved, and the critical cooling rate corresponding to proeutectoid ferrite is reduced.
P: p is less than or equal to 0.02 percent, is a harmful element in the steel, and improves the ductile-brittle transition temperature of the steel, so the content of P is strictly controlled by the method.
S: s is less than or equal to 0.02 percent, and S is easy to segregate in the steel, thus deteriorating the quality of the steel. The S element easily causes overheating and overburning phenomena in the hot working process of the steel to a certain extent. Therefore, the S content is strictly controlled by the invention.
The reason for setting the production process of the invention is as follows:
according to the content range of the main chemical element components, in order to ensure that the material is fully austenitized during quenching and heating and simultaneously avoid excessive growth of high-temperature austenite grains, the quenching temperature is 880-920 ℃, and the temperature is kept for 10-20 min. Because the content of C in the rotary blade material is reduced, the content of C is controlled to be 0.30-0.36%, and in order to ensure that the material has enough hardness after quenching, water quenching is adopted for quenching and cooling to room temperature. In order to separate out carbide for sufficient time during tempering of the material and improve the impact toughness of the material, the tempering temperature is 280-320 ℃, and the heat preservation time is 15-25 min.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the invention can improve the toughness of the steel by reducing the content of C in a proper amount. B element is added, the content of the B element is controlled to be 0.001-0.006%, the hardenability of the steel is improved, and meanwhile, a corresponding heat treatment process is adopted: 880 processing, 920 ℃ quenching, heat preservation for 10-20min, water cooling to room temperature, 280 processing, 320 ℃ tempering, heat preservation for 15-25min, so that the impact toughness of the rotary blade is improved to 15-25J from below 15J of the existing material. The impact toughness is obviously improved, the use requirement of the rotary tillage cutter of high-toughness agricultural implements is met, and the production cost is low.
Drawings
FIG. 1 is a metallographic structure diagram of a heat-treated steel for a high-toughness rotary blade in example 1 (the metallographic structure diagrams in examples 2 to 7 are similar to those in example 1 and are therefore omitted).
Detailed Description
The present invention will be described in further detail with reference to the following specific embodiments and the accompanying drawings.
The heat treatment method of the steel for the high-toughness rotary blade sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: the quenching temperature is 880-920 ℃, the temperature is kept for 10-20min, the water is cooled to the room temperature, the 280-320 ℃ tempering is carried out, and the temperature is kept for 15-25 min.
Example 1
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: quenching temperature is 890 ℃, heat preservation is carried out for 15min, water is cooled to room temperature, tempering is carried out at 300 ℃, and heat preservation is carried out for 15 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 46HRC impact value 20J.
The metallographic structure of the steel for a high-toughness rotary blade of this example is shown in FIG. 1.
Example 2
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: the quenching temperature is 880 ℃, the temperature is kept for 10min, the room temperature is cooled by water, the tempering is carried out at 320 ℃, and the temperature is kept for 21 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 47HRC impact value 18J.
Example 3
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: quenching temperature is 915 ℃, heat preservation is carried out for 13min, water is cooled to room temperature, tempering is carried out at 290 ℃, and heat preservation is carried out for 22 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 45HRC impact value 22J.
Example 4
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: quenching temperature is 900 ℃, heat preservation is carried out for 18min, water is cooled to room temperature, tempering is carried out at 280 ℃, and heat preservation is carried out for 18 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 47HRC impact value 25J.
Example 5
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: the quenching temperature is 920 ℃, the temperature is kept for 14min, the water is cooled to the room temperature, the tempering is carried out at 310 ℃, and the temperature is kept for 20 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 46.5HRC impact value 23J.
Example 6
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: the quenching temperature is 910 ℃, the temperature is kept for 12min, the room temperature is cooled by water, the tempering is carried out at 315 ℃, and the temperature is kept for 25 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 46.5HRC impact value 21J.
Example 7
The chemical composition and the mass percentage of the steel for the high-toughness rotary blade of the embodiment are shown in table 1.
The heat treatment method of the high-toughness steel for the rotary blade of the embodiment sequentially comprises the following steps of: quenching, heat preservation, water cooling, tempering and heat preservation, and the specific technological parameters are as follows: the quenching temperature is 905 ℃, the temperature is kept for 20min, the temperature is cooled to room temperature by water, the tempering is carried out at 288 ℃, and the temperature is kept for 21 min.
The detection result of the mechanical property of the high-toughness steel for the rotary blade is as follows: hardness 48HRC impact value 23J.
The components and contents of the steel for a high toughness rotary blade according to the present invention in each example are shown in Table 1.
TABLE 1 chemical composition (wt%) of the steels of examples 1-7
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The high-toughness steel for the rotary blade is characterized by comprising the following chemical components in percentage by mass: c: 0.30-0.36%, Mn: 0.90-1.50%, Si: 0.20.-0.50%, B: 0.001-0.006%, S less than or equal to 0.02%, P less than or equal to 0.02%, and the balance of Fe and inevitable impurities.
2. The steel for a high-toughness rotary blade according to claim 1, wherein the microstructure of the steel for a high-toughness rotary blade is tempered martensite, and the decarburization depth is 0.
3. A high toughness steel for rotary blade as claimed in claim 1, wherein the hardness of steel is 45-47HRC, and the impact toughness is 15-20J.
4. The method for heat-treating a steel for a high-toughness rotary blade according to claim 1, 2 or 3, wherein the method comprises the following steps in order: quenching, heat preservation, water cooling, tempering and heat preservation.
5. The heat treatment method of the steel for the high-toughness rotary blade as claimed in claim 4, wherein the quenching temperature is 880-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011262059.XA CN112359292A (en) | 2020-11-12 | 2020-11-12 | High-toughness steel for rotary blade and heat treatment method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011262059.XA CN112359292A (en) | 2020-11-12 | 2020-11-12 | High-toughness steel for rotary blade and heat treatment method thereof |
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| CN112359292A true CN112359292A (en) | 2021-02-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060896A (en) * | 2000-08-24 | 2002-02-28 | Nisshin Steel Co Ltd | Steel sheet for mower blade |
| JP2008111146A (en) * | 2006-10-30 | 2008-05-15 | Jfe Steel Kk | Steel for blade of excavation tool or steel for blade of rock drilling tool, and its manufacturing method |
| CN101717890A (en) * | 2009-11-26 | 2010-06-02 | 三一重工股份有限公司 | Cast low alloy steel for grader blade and preparation method |
| CN105274431A (en) * | 2014-06-09 | 2016-01-27 | 鞍钢股份有限公司 | Hot-rolling strip-steel harrow disk suitable for water quenching and manufacture method thereof |
| CN105543630A (en) * | 2015-12-21 | 2016-05-04 | 秦皇岛首秦金属材料有限公司 | Steel for boron-contained high carbon saw blade and manufacturing method thereof |
| CN109881122A (en) * | 2019-03-13 | 2019-06-14 | 南京工业职业技术学院 | Big tilling depth rotary blade material of abrasion resistant and corrosion resistant and preparation method thereof |
-
2020
- 2020-11-12 CN CN202011262059.XA patent/CN112359292A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002060896A (en) * | 2000-08-24 | 2002-02-28 | Nisshin Steel Co Ltd | Steel sheet for mower blade |
| JP2008111146A (en) * | 2006-10-30 | 2008-05-15 | Jfe Steel Kk | Steel for blade of excavation tool or steel for blade of rock drilling tool, and its manufacturing method |
| CN101717890A (en) * | 2009-11-26 | 2010-06-02 | 三一重工股份有限公司 | Cast low alloy steel for grader blade and preparation method |
| CN105274431A (en) * | 2014-06-09 | 2016-01-27 | 鞍钢股份有限公司 | Hot-rolling strip-steel harrow disk suitable for water quenching and manufacture method thereof |
| CN105543630A (en) * | 2015-12-21 | 2016-05-04 | 秦皇岛首秦金属材料有限公司 | Steel for boron-contained high carbon saw blade and manufacturing method thereof |
| CN109881122A (en) * | 2019-03-13 | 2019-06-14 | 南京工业职业技术学院 | Big tilling depth rotary blade material of abrasion resistant and corrosion resistant and preparation method thereof |
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Application publication date: 20210212 |
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