CN112342460A - Steel for B2 high-end steel ball of ball mill and rolling method thereof - Google Patents
Steel for B2 high-end steel ball of ball mill and rolling method thereof Download PDFInfo
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- CN112342460A CN112342460A CN202010913995.6A CN202010913995A CN112342460A CN 112342460 A CN112342460 A CN 112342460A CN 202010913995 A CN202010913995 A CN 202010913995A CN 112342460 A CN112342460 A CN 112342460A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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
- C22C38/002—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
- C22C38/04—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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses steel for a B2 high-end steel ball of a ball mill and a rolling method thereof, and the chemical components of the steel for the B2 high-end steel ball of the ball mill comprise the following components in percentage by mass: 0.65-0.75% of C, 0.15-0.37% of Si, 0.80-0.92% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.060% of Al, 0.80-0.90% of Cr, less than or equal to 0.30% of Cu, less than or equal to 0.30% of Ni, and less than or equal to 2.0ppm of [ H ]; [ O ] is less than or equal to 20 ppm; the content of N is less than or equal to 80ppm, and the balance of Fe and inevitable impurities. The steel for the high-end steel ball of the ball mill B2 provided by the invention has excellent wear resistance and toughness, and can effectively ensure long-term stable operation of the ball mill.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to steel for a B2 high-end steel ball of a ball mill and a rolling method thereof.
Background
The wear-resistant steel ball is also called as a wear-resistant medium for a grinder, and is widely applied to ball mills in industries such as metallurgical mines, cement building materials, thermal power generation, flue gas desulfurization, magnetic materials, chemical engineering, coal water slurry, pellet ore, slag, ultrafine powder, fly ash, calcium carbonate, quartz sand and the like. It is a consumable, and the main purpose is to grind materials to make the materials finer to reach the use standard.
However, the existing steel for the B2 high-end steel ball has the defects of low heat treatment hardness, poor impact resistance, low breakage resistance rate of the steel ball and the like, the service life of the steel ball for the ball mill is shortened, and the long-term stable operation of the ball mill is influenced.
Disclosure of Invention
In order to solve one or more problems in the prior art, the invention provides steel for a B2 high-end steel ball of a ball mill, which comprises the following chemical components in percentage by mass: 0.65-0.75% of C, 0.15-0.37% of Si, 0.80-0.92% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.060% of Al, 0.80-0.90% of Cr, less than or equal to 0.30% of Cu, less than or equal to 0.30% of Ni, and less than or equal to 2.0ppm of [ H ]; [ O ] is less than or equal to 20 ppm; the content of N is less than or equal to 80ppm, and the balance of Fe and inevitable impurities.
The invention also provides a rolling method of the steel for the high-end steel ball of the ball mill B2, which comprises the following process steps: heating a continuous casting billet, removing phosphorus by high-pressure water, and rolling by a phi 850 cogging mill, a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit; wherein:
in the heating process step of the continuous casting billet, the preheating section is less than or equal to 850 ℃, the first heating section is 1050-1150 ℃, the second heating section is 1140-1230 ℃, the soaking section is 1120-1200 ℃, the heating section is slowly heated, overburning or overheating is forbidden, the internal and external temperatures of the continuous casting billet are ensured to be uniform, and the soaking time of the continuous casting billet is ensured to be more than or equal to 45 min;
in the rolling process steps of a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, the cogging temperature of the phi 850 cogging mill is controlled to be 1050-1120 ℃, the cogging temperature of the phi 700mm rolling mill is controlled to be 970-1030 ℃, the finishing temperature is controlled to be more than or equal to 846 ℃, and the temperature of entering a slow cooling pit is more than or equal to 520 ℃.
Based onThe rolling method of the steel for the high-end steel ball of the ball mill B2, which is provided by the technical scheme, obtains the steel for the high-end steel ball of the ball mill B2, which has higher hardness and better impact toughness, and the example results show that the hardness of the steel for the high-end steel ball of the ball mill B2, which is obtained by the method provided by the invention, meets the following requirements: the hot rolling state hardness is more than or equal to 26.4HRC, the surface hardness in the heat treatment hardness is more than or equal to 60HRC, and the core hardness is more than or equal to 56HRC, which meet and exceed the requirements of technical protocols. And the impact toughness of the steel for the high-end steel ball of the hot-rolled ball mill B2 meets the requirements (normal temperature): not less than 14J (J/cm)2) The heat treatment impact toughness is more than or equal to 13.9J (J/cm)2) Compared with the steel for the high-end steel ball of the ball mill B2 in the prior art, the high-end steel ball has better wear resistance and toughness, and can effectively ensure the long-term stable operation of the ball mill.
Detailed Description
The invention aims to provide steel for a B2 high-end steel ball of a ball mill and a rolling method thereof, so as to obtain the steel for the B2 high-end steel ball of the ball mill, which has excellent mechanical properties, particularly excellent toughness and wear resistance.
The chemical components of the steel for the high-end steel ball of the ball mill B2 comprise the following components in percentage by mass: 0.65-0.75% of C, 0.15-0.37% of Si, 0.80-0.92% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.060% of Al, 0.80-0.90% of Cr, less than or equal to 0.30% of Cu, less than or equal to 0.30% of Ni, and less than or equal to 2.0ppm of [ H ]; [ O ] is less than or equal to 20 ppm; the content of N is less than or equal to 80ppm, and the balance of Fe and inevitable impurities.
The production method of the steel for the high-end steel ball of the ball mill B2 comprises the following process steps:
the production process of the continuous casting billet comprises the following steps: blast furnace molten iron-molten iron pretreatment-converter top and bottom combined blowing smelting-LF external refining-VD vacuum treatment-continuous casting-slow cooling pit slow cooling; the process steps can be carried out according to the conventional steel process steps for producing the high-end steel ball of the ball mill B2;
the rolling process comprises the following steps: heating a continuous casting billet, removing phosphorus by high-pressure water, rolling by a phi 850 cogging mill, rolling by a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, sawing (sampling), stacking (cooling and heat collecting), checking, polishing, bundling, warehousing and delivering goods;
on the premise of ensuring that the components of the finished continuous casting billet meet the requirements of users, the compression ratio of the hot-rolled round steel is ensured to be more than or equal to 15, and the reasonable continuous casting billet specification is determined according to the specification and the compression ratio requirement. The specification of the ball mill hot-rolled steel ball hot-rolled round steel is phi 50 mm-phi 100mm, and the adopted continuous casting blank types are phi 245 mm-phi 350mm, 280 × 380mm and 320 × 415 mm;
in the heating process step of the continuous casting billet, different heating systems are determined according to different specifications of the continuous casting billet, the preheating section is less than or equal to 850 ℃, the heating section is 1050-1150 ℃, the heating section is 1140-1230 ℃, the soaking section is 1120-1200 ℃, slow heating is adopted in the heating section, overburning or overheating is forbidden, the uniform temperature inside and outside the continuous casting billet is ensured, and the soaking time of the continuous casting billet is ensured to be more than or equal to 45 min;
in the rolling process steps of a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, the cogging temperature of the phi 850 cogging mill is controlled to be 1050-1120 ℃, the cogging temperature of the phi 700mm rolling mill is controlled to be 970-1030 ℃, the finishing temperature is controlled to be more than or equal to 846 ℃, and the temperature of entering a slow cooling pit is more than or equal to 520 ℃;
and finally, according to the requirements of technical protocols, carrying out hot rolling performance inspection on the hot rolled round steel, and filling the relevant performance into a quality assurance book according to the inspection.
The present invention will be described in detail below with reference to specific examples, which are intended to facilitate understanding of the present invention and are not intended to limit the present invention.
The flange steel was produced according to the method provided above according to the chemical compositions of example 1 to example 3 listed in the following table 1.
Table 1: chemical composition and content (%)% of Steel for high-end Steel ball of ball Mill B2 in examples 1 to 3
1) Casting blank heating process
The reasonable heating time and heating speed of the continuous casting billet are determined according to different specifications and thermodynamic formulas, and are shown in the following table 2.
Table 2: heating temperature and soaking time
2) Phi 850 cogging mill and phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling mill rolling process
In order to ensure the product quality and the smooth rolling, the uniform rolling is adopted, and the temperature-raising rolling is strictly avoided. The specific parameters are shown in Table 3.
Table 3: the initial rolling temperature, the final rolling temperature and the temperature of entering a slow cooling pit
3) Surface quality
The hot-rolled round steel is slowly cooled for more than 48 hours, and the surface of the hot-rolled round steel has no defects such as surface cracks and the like, thereby completely meeting the technical protocol requirements.
4) Performance test
According to the technical protocol, impact and hardness tests are carried out on hot rolled round steel and heat-treated round steel (the hot rolled round steel is subjected to heat preservation for 2-3 hours at about 860 ℃, then water quenching is carried out, the quenched steel ball is heated to about 210 ℃ for tempering treatment, the steel ball is subjected to heat preservation for 1-2 hours, then the steel ball is moved into a slow cooling pit and is slowly cooled to room temperature, and a heat-treated round steel finished product is obtained), and the tests are specifically shown in the following tables 4 and 5.
Table 4: rockwell hardness test result units: HRC
Table 5: impact test results unit: j. the design is a square
As can be seen from tables 4 and 5 above, through the present inventionThe hardness of the steel for the high-end steel ball of the ball mill B2 obtained by the method satisfies the following requirements: the hot rolling state hardness is more than or equal to 26.4HRC, the surface hardness in the heat treatment hardness is more than or equal to 60HRC, and the core hardness is more than or equal to 56HRC, which meet and exceed the requirements of technical protocols. And the impact toughness of the steel for the high-end steel ball of the hot-rolled ball mill B2 meets the requirements (normal temperature): not less than 14J (J/cm)2) The heat treatment impact toughness is more than or equal to 13.9J (J/cm)2) Compared with the steel for the high-end steel ball of the ball mill B2 in the prior art, the high-end steel ball has better wear resistance and toughness, and can effectively ensure the long-term stable operation of the ball mill.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The steel for the high-end steel ball of the ball mill B2 is characterized in that the chemical components of the steel for the high-end steel ball of the ball mill B2 comprise the following components in percentage by mass: 0.65-0.75% of C, 0.15-0.37% of Si, 0.80-0.92% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, less than or equal to 0.060% of Al, 0.80-0.90% of Cr, less than or equal to 0.30% of Cu, less than or equal to 0.30% of Ni, and less than or equal to 2.0ppm of [ H ]; [ O ] is less than or equal to 20 ppm; the content of N is less than or equal to 80ppm, and the balance of Fe and inevitable impurities.
2. The rolling method of steel for high-end steel balls of ball mill B2 as claimed in claim 1, which comprises the following steps: heating a continuous casting billet, removing phosphorus by high-pressure water, and rolling by a phi 850 cogging mill, a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit; wherein:
in the heating process step of the continuous casting billet, the preheating section is less than or equal to 850 ℃, the first heating section is 1050-1150 ℃, the second heating section is 1140-1230 ℃, the soaking section is 1120-1200 ℃, the heating section is slowly heated, overburning or overheating is forbidden, the internal and external temperatures of the continuous casting billet are ensured to be uniform, and the soaking time of the continuous casting billet is ensured to be more than or equal to 45 min;
in the rolling process steps of a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit, the cogging temperature of the phi 850 cogging mill is controlled to be 1050-1120 ℃, the cogging temperature of the phi 700mm rolling mill is controlled to be 970-1030 ℃, the finishing temperature is controlled to be more than or equal to 846 ℃, and the temperature of entering a slow cooling pit is more than or equal to 520 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010913995.6A CN112342460A (en) | 2020-09-03 | 2020-09-03 | Steel for B2 high-end steel ball of ball mill and rolling method thereof |
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| CN202010913995.6A CN112342460A (en) | 2020-09-03 | 2020-09-03 | Steel for B2 high-end steel ball of ball mill and rolling method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635080A (en) * | 2022-02-10 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Steel for heavy truck axle and production method thereof |
| CN114959473A (en) * | 2022-05-25 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Steel for thrust wheel of bulldozer and production method thereof |
| CN115323264A (en) * | 2022-07-12 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | High-wear-resistance steel ball AK-B3 hot-rolled round steel and production method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635080A (en) * | 2022-02-10 | 2022-06-17 | 包头钢铁（集团）有限责任公司 | Steel for heavy truck axle and production method thereof |
| CN114959473A (en) * | 2022-05-25 | 2022-08-30 | 包头钢铁（集团）有限责任公司 | Steel for thrust wheel of bulldozer and production method thereof |
| CN114959473B (en) * | 2022-05-25 | 2023-08-25 | 包头钢铁（集团）有限责任公司 | Steel for bulldozer thrust wheel and production method thereof |
| CN115323264A (en) * | 2022-07-12 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | High-wear-resistance steel ball AK-B3 hot-rolled round steel and production method thereof |
| CN115323264B (en) * | 2022-07-12 | 2023-09-26 | 包头钢铁（集团）有限责任公司 | High-wear-resistance steel ball AK-B3 hot rolled round steel and production method thereof |
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