CN112239834B - Steel for high-strength and high-wear-resistance rare earth ball mill hot-rolled steel balls and rolling method thereof - Google Patents
Steel for high-strength and high-wear-resistance rare earth ball mill hot-rolled steel balls and rolling method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- 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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- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The invention discloses a high-strength and high-wear-resistance steel for a rare earth ball mill hot-rolled steel ball and a rolling method thereof, and the provided steel for the ball mill hot-rolled steel ball comprises the following chemical components in percentage by mass: 0.58 to 0.66 percent of C, 1.60 to 1.90 percent of Si, 0.65 to 0.85 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.060 percent of Al, 0.70 to 0.90 percent of Cr, 0.05 to 0.15 percent of Mo, 10 to 30ppm of RE, less than or equal to 0.30 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.020 percent of Pb, less than or equal to 0.030 percent of Sn, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 80ppm of [ N ], and the balance of Fe and inevitable impurities. The steel for hot rolling steel balls of the ball mill provided by the invention has higher strength, hardness and toughness, and can 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 high-strength and high-wear-resistance steel for a hot-rolled steel ball of a rare earth 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 strength and toughness indexes of the high-strength and high-wear-resistance steel for ball mills used in the prior art are slightly insufficient, and further optimization is required.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides high-strength and high-wear-resistance steel for a hot-rolled steel ball of a rare earth ball mill, which comprises the following chemical components in percentage by mass: 0.58 to 0.66 percent of C, 1.60 to 1.90 percent of Si, 0.65 to 0.85 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.060 percent of Al, 0.70 to 0.90 percent of Cr, 0.05 to 0.15 percent of Mo, 10 to 30ppm of RE, less than or equal to 0.30 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.020 percent of Pb, less than or equal to 0.030 percent of Sn, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 80ppm of [ N ], and the balance of Fe and inevitable impurities.
The invention also provides a rolling method of the steel for the hot rolling steel ball of the high-strength and high-wear-resistance rare earth ball mill, 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 steps 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 1150-1220 ℃, the heating section is slowly heated, overburning or overheating is forbidden, the internal and external temperatures of the continuous casting billet are uniform, and the soaking time of the continuous casting billet is 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 530 ℃.
Based on the technical scheme, the high-strength and high-wear-resistance rare earth ball mill hot rolling steel for steel balls is high in hardness and strength and good in toughness, and the mechanical properties of the high-strength and high-wear-resistance rare earth ball mill hot rolling steel for steel balls meet the following requirements: the yield strength Rp0.2 is more than or equal to 634MPa, the tensile strength is more than or equal to 1080MPa, the yield ratio is less than or equal to 0.60, the elongation A is more than or equal to 10.0 percent, and the Z is more than or equal to 13 percent, so that the steel for the ball mill has excellent strength and toughness properties. Meanwhile, the normal-temperature impact toughness of the prepared steel for the high-strength and high-wear-resistance rare earth ball mill hot-rolled steel ball meets the requirements that: 141J or more, and 317HB or more as the hardness index, and has high impact toughness and hardness and good wear resistance.
Detailed Description
The invention aims to provide the steel for the high-strength and high-wear-resistance rare earth ball mill hot-rolled steel ball and the rolling method thereof, so as to obtain the steel for the high-strength and high-wear-resistance rare earth ball mill hot-rolled steel ball with excellent mechanical properties, particularly higher strength, better toughness and wear resistance.
The steel for the hot-rolled steel ball of the high-strength and high-wear-resistance rare earth ball mill comprises the following chemical components in percentage by mass: 0.58 to 0.66 percent of C, 1.60 to 1.90 percent of Si, 0.65 to 0.85 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.060 percent of Al, 0.70 to 0.90 percent of Cr, 0.05 to 0.15 percent of Mo, 10 to 30ppm of RE, less than or equal to 0.30 percent of Ni, less than or equal to 0.30 percent of Cu, less than or equal to 0.020 percent of Pb, less than or equal to 0.030 percent of Sn, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 80ppm of [ N ], and the balance of Fe and inevitable impurities.
High hardness, good toughness, low breakage rate and low out-of-roundness rate are the main requirements of the ball mill on the wear-resistant steel balls. The chemical composition design of the steel for the wear-resistant steel balls is to fully embody the requirement. Under a certain applied load, the hardness of the material is a decisive factor in determining the wear resistance against abrasion. The C content in various chemical elements has the greatest influence on the hardness, but the excessively high C content inevitably reduces the toughness of the steel and increases the brittleness of the steel, so that the C content is properly reduced compared with the traditional bearing steel ball and is controlled to be about 0.60 percent. The Mn content is usually controlled to be less than 1%, so that the solid solution strengthening effect can be exerted and the toughness of the steel can be improved. The corrosion and abrasion is also an important aspect of the abrasion failure of metal materials, and for the grinding ball materials which are suitable for different grinded minerals, proper addition of Cr, Mo and RE alloy elements is considered in component design so as to improve the corrosion resistance. Cr can obviously improve the antioxidation of steel, increase the corrosion resistance of the steel and also can well improve the hardenability of the steel, and about 1 percent of Cr is added into high-C steel to form special carbide in the steel, thereby obviously improving the wear resistance of the steel, especially the wear resistance of the surface layer of the steel. The addition of a small amount of RE (such as Ce) in the steel can ensure that the high-strength steel has high toughness at the same time, and is particularly necessary under low-temperature conditions. The addition of a small amount of Mo exerts its effects of improving hardenability and corrosion resistance, and mainly exerts its tendency to suppress temper embrittlement of Mn, Cr, and to reduce the tendency of carbide to form a continuous network at grain boundaries. In addition, about 0.030% of Al should be added into the steel for grain refinement; in order to ensure the purity of steel and reduce non-metallic inclusions serving as fatigue sources, the content of O is limited to be below 0.0020 percent; to reduce the deleterious effects of P, S, the amount thereof must also be limited.
The production method of the steel for the hot-rolled steel ball of the rare earth ball mill with high strength and high wear resistance 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 process steps for producing steel for hot rolling steel balls of ball mills;
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 120mm, and continuous casting blank types of phi 245 mm-phi 350mm, 280 × 380mm and 320 × 415mm are adopted;
in the heating process steps 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 1150-1220 ℃, the heating section is slowly heated, overburning or overheating is forbidden, the internal and external temperatures of the continuous casting billet are uniform, and the soaking time of the continuous casting billet is 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 530 ℃;
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 (%)
| Examples | C | Si | Mn | P | S | Ni | Al | Cu | RE | Mo | Cr |
| Example 1 | 0.58 | 1.75 | 0.71 | 0.020 | 0.021 | 0.21 | 0.031 | 0.24 | 10ppm | 0.09 | 0.70 |
| Example 2 | 0.60 | 1.61 | 0.85 | 0.016 | 0.018 | 0.20 | 0.035 | 0.22 | 20ppm | 0.11 | 0.84 |
| Example 3 | 0.66 | 1.90 | 0.65 | 0.015 | 0.015 | 0.22 | 0.028 | 0.21 | 30ppm | 0.15 | 0.90 |
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, the hot rolled round steel is tested for mechanical properties, impact and hardness, and the specific test results are shown in the following tables 4, 5 and 6.
Table 4: mechanical properties of hot-rolled round steel
Table 5: impact test results (hot rolled state) units: j. the design is a square
Table 6: rockwell hardness test results (hot rolled state) units: HB
As can be seen from the above tables 4, 5 and 6, the mechanical properties of the high-strength and high-wear-resistance steel for the hot-rolled steel ball of the rare earth ball mill obtained by the method of the present invention satisfy: the yield strength Rp0.2 is more than or equal to 634MPa, the tensile strength is more than or equal to 1080MPa, the yield ratio is less than or equal to 0.60, the elongation A is more than or equal to 10.0 percent, and the Z is more than or equal to 13 percent; the impact toughness satisfies the following conditions: 141J or more, and the hardness meets the following requirements: the invention obtains the steel for the hot rolling steel ball of the rare earth ball mill, which has high strength, high wear resistance, high toughness and high impact toughness, and is more than or equal to 317 HB.
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 (1)
1. The steel for the high-strength and high-wear-resistance rare earth ball mill hot-rolled steel ball is characterized by comprising the following chemical components in percentage by mass: 0.58 to 0.66 percent of C, 1.60 to 1.90 percent of Si, 0.65 to 0.85 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, less than or equal to 0.060 percent of Al, 0.70 to 0.90 percent of Cr, 0.05 to 0.15 percent of Mo, 10 to 30ppm of RE, 0.20 to 0.22 percent of Ni, 0.21 to 0.24 percent of Cu, less than or equal to 0.020 percent of Pb, less than or equal to 0.030 percent of Sn, less than or equal to 2.0ppm of [ H ], lessthan or equal to 20ppm of [ O ], lessthan or equal to 80ppm of [ N ], and the balance of Fe and inevitable impurities;
the rolling method of the steel for the hot-rolled steel ball of the high-strength and high-wear-resistance rare earth ball mill comprises the following process steps: heating a continuous casting billet, descaling by high-pressure water, rolling by a phi 850 cogging mill, and rolling by a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 continuous rolling unit; wherein:
in the heating process steps 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 1150-1220 ℃, the heating section is slowly heated, overburning or overheating is forbidden, the internal and external temperatures of the continuous casting billet are uniform, and the soaking time of the continuous casting billet is 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 530 ℃;
the mechanical properties of the steel for the high-strength and high-wear-resistance rare earth ball mill hot-rolled steel ball meet the following requirements: the yield strength Rp0.2 is more than or equal to 634MPa, the tensile strength is more than or equal to 1080MPa, the yield ratio is less than or equal to 0.60, the elongation A is more than or equal to 10.0 percent, and the Z is more than or equal to 13 percent; the impact toughness satisfies the following conditions: 141J or more, and the hardness meets the following requirements: 317HB or more.
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| 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 |
| CN115612914A (en) * | 2022-10-25 | 2023-01-17 | 本钢板材股份有限公司 | Preparation method of steel for high-silicon grinding ball |
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| CN101792885A (en) * | 2010-03-30 | 2010-08-04 | 莱芜钢铁集团有限公司 | Hot-rolled round steel for high carbon manganese and chrome grinding ball and method for producing same |
| CN104762562A (en) * | 2015-04-23 | 2015-07-08 | 山东钢铁股份有限公司 | Steel for large-diameter grinding balls and preparation method of steel |
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| CN108823505A (en) * | 2018-06-06 | 2018-11-16 | 西王金属科技有限公司 | A kind of RE alloyed mill ball steel and its manufacturing method |
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| CN101792885A (en) * | 2010-03-30 | 2010-08-04 | 莱芜钢铁集团有限公司 | Hot-rolled round steel for high carbon manganese and chrome grinding ball and method for producing same |
| CN104762562A (en) * | 2015-04-23 | 2015-07-08 | 山东钢铁股份有限公司 | Steel for large-diameter grinding balls and preparation method of steel |
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| CN108823505A (en) * | 2018-06-06 | 2018-11-16 | 西王金属科技有限公司 | A kind of RE alloyed mill ball steel and its manufacturing method |
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