CN110952025A - Mining wear-resistant KYNM500 steel and preparation method thereof - Google Patents
Mining wear-resistant KYNM500 steel and preparation method thereof Download PDFInfo
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- CN110952025A CN110952025A CN201911116282.0A CN201911116282A CN110952025A CN 110952025 A CN110952025 A CN 110952025A CN 201911116282 A CN201911116282 A CN 201911116282A CN 110952025 A CN110952025 A CN 110952025A
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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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
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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
- 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
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- Mechanical Engineering (AREA)
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Abstract
The invention discloses a mining wear-resistant KYNM500 steel, which comprises the following chemical components in percentage by mass: 0.58-0.66% of C, 1.60-1.90% of Si, 0.65-0.85% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.060% of Al, 0.70-0.90% of Cr, 0.05-0.15% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.020% of Pb, less than or equal to 0.030% of Sn, and the balance of Fe and inevitable. Its preparing process is also disclosed. On the premise of the existing process route, the steel for rolling the wear-resistant steel for the client is produced by adopting a specific smelting process and narrow component control.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a mining wear-resistant KYNM500 steel and a preparation method thereof.
Background
The wear-resistant steel ball is also called as a wear-resistant medium for a grinder, is a consumable, is mainly used for grinding materials to enable the materials to be ground to be finer so as to reach the use standard, is mainly used in the fields of mines, power plants, cement plants, steel plants, silicon sand plants, coal chemical industry and the like, and has the consumption of 3000 plus materials and 5000 million tons of steel balls in each year around the world, wherein the consumption of the Chinese steel balls is 500 million tons of plus materials, which is a large country with steel ball consumption.
The steel balls are classified into three types, namely forged steel balls, cast steel balls and hot-rolled steel balls. With good environmental protection and benefit of industry, low energy consumption, no pollution, low labor intensity and low production cost are one of the advantages of the hot rolling steel ball. Hot rolling steel balls are a brand new rolling technology, and are a technological breakthrough in ball milling ball manufacturing industry, and are gradually replacing cast balls and common forged balls. The hot rolled steel ball has the advantages of stable quality, excellent mechanical property, high hardness, good hardenability, compact metallographic structure, fine crystal grains, no deformation, low steel ball deformation, no out-of-round, good wear resistance, high impact toughness, stable product quality and the like.
Contents of the invention
The invention aims to provide a mining wear-resistant KYNM500 steel and a preparation method thereof, and the steel for rolling the mining wear-resistant steel is produced by adopting a specific smelting process and narrow component control on the premise of the existing process route.
In order to solve the technical problems, the invention adopts the following technical scheme:
the mining wear-resistant KYNM500 steel comprises the following chemical components in percentage by mass: 0.58-0.66% of C, 1.60-1.90% of Si, 0.65-0.85% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.060% of Al, 0.70-0.90% of Cr, 0.05-0.15% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.020% of Pb, less than or equal to 0.030% of Sn, and the balance of Fe and inevitable.
A preparation method of mining wear-resistant KYNM500 steel comprises the following steps:
1) production in a converter
In order to ensure the product quality and accurately control the components of the finished product, the molten iron of the converter is required to be: the phosphorus content is less than or equal to 0.13 percent and the sulfur content is less than or equal to 0.050 percent according to the mass percentage; adding a slagging auxiliary material in the smelting process of the converter, and carrying out deoxidation alloying according to the requirements of the finished product of the wear-resistant KYNM500 component for mine in the tapping process;
the carbon content, the phosphorus content and the tapping temperature of the molten steel at the end point of the converter are as follows:
the tapping temperature is 1608-; the carbon content is 0.06-0.10%, and the average is 0.07%; the phosphorus content is 0.011-0.020%, and the average content is 0.015%;
2) LF furnace production
The LF furnace refining in-place temperature is 1531-1546 ℃, and the average temperature is 1539 ℃; the refining dislocation temperature is 1572-; refining treatment time is 55-73 min; adding ferromolybdenum according to the standard component requirement in the later stage of refining;
3) VD furnace production
And the molten steel is subjected to vacuum degassing treatment in a VD furnace, so that the content of harmful gases in the steel is further reduced, the cleanliness of the steel is improved, and the gas content requirement is as follows: [ O ] is less than or equal to 20 ppm; the content of [ N ] is less than or equal to 80 ppm; [H] less than or equal to 2.5 ppm; feeding a calcium-silicon wire to denature impurities; requiring that the deep vacuum time of VD furnace smelting is more than 13min, the deep vacuum degree is less than or equal to 0.10Kpa, and the soft blowing time is 13-15 min; soft blowing flow rate is 80-200 Nl/min; the temperature of the upper stage 1517-1523 ℃;
4) continuous casting production
The superheat degree is controlled between 20 and 33 ℃ in continuous casting production, and the drawing speed is between 0.65 and 0.67 m/min; and (5) slowly cooling the continuous casting billet for more than 48 hours.
Further, in the step 2), the refining in-situ temperature of the LF furnace is 1539 ℃, the refining out-of-situ temperature is 1577 ℃, and the refining treatment time is 60 min.
Further, the soft blowing time in the step 3) is 14 min; the soft blowing flow rate is 140 Nl/min; the upper stage temperature was 1518 ℃.
Further, feeding 100m of calcium silicate wire for inclusion modification after refining in the step 3).
Further, the slagging auxiliary materials comprise: 0-80kg of calcium carbide and 0-80kg of fluorite.
Compared with the prior art, the invention has the beneficial technical effects that:
on the premise of the existing process route, the steel for rolling the wear-resistant steel for the client is produced by adopting a specific smelting process and narrow component control;
the continuous casting billet is slowly cooled for more than 48 hours, and the surface of the continuous casting billet has no defects of surface cracks and the like, so that the surface quality requirement of producing hot-rolled round steel is completely met.
Detailed Description
The mining wear-resistant KYNM500 steel comprises the following chemical components in percentage by mass: 0.58-0.66% of C, 1.60-1.90% of Si, 0.65-0.85% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.060% of Al, 0.70-0.90% of Cr, 0.05-0.15% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.020% of Pb, less than or equal to 0.030% of Sn, and the balance of Fe and inevitable.
The industrial production process is briefly described as follows:
converter smelting (LF) ladle furnace refining (VD) vacuum degassing (280 x 380mm) continuous casting (280 x 380mm) special steel rolling.
The industrial production is more than 3 furnaces, and the specific technological parameters are controlled as follows:
1) converter production
3500 kg of lime, 1500 kg of dolomite, 2300kg of iron sheet and 1000 kg of white ash are added according to actual conditions during smelting in a converter, and silicon, manganese and silicon iron are added in the tapping process.
The carbon content, phosphorus content (mass percent) and tapping temperature of the molten steel at the end of the converter are shown in Table 1.
TABLE 1 composition and temperature of converter tapping
2) LF furnace production
And in the LF furnace refining, adding auxiliary materials for slagging according to the components and temperature change of the molten steel, and adding alloy for fine adjustment and heating operation. Adding 0-80kg of calcium carbide and 0-80kg of fluorite, finely adjusting 0-100kg of ferromanganese, 0-50kg of ferrosilicon, 200kg of high-carbon ferrochrome and 200kg of ferromolybdenum according to the refined in-place components, feeding 150m of aluminum wire, and showing the temperature and the treatment time of the molten steel in a table 2.
TABLE 2 refining LF furnace temperature control
3) Production by VD furnace
After ladle LF refining, molten steel is subjected to vacuum degassing treatment by a VD furnace, so that the content of harmful gases in the steel is further reduced, the cleanliness of the steel is improved, and the gas content is required: [ O ] is less than or equal to 20 ppm; [ N ] is less than or equal to 90 ppm; [H] less than or equal to 2.5ppm, and feeding the refined calcium silicate wire for 100m to denature the inclusions. The deep vacuum time of VD furnace smelting is required to be more than or equal to 13min, and other process parameters are shown in Table 3.
TABLE 3 refining VD furnace Process control
4) Continuous casting production
The superheat degree in the continuous casting production is controlled between 22 ℃ and 33 ℃, the drawing speed is between 0.65m/min and 0.67m/min, and the components (mass percent) of the molten steel are controlled as shown in Table 4.
TABLE 4 Final composition (%)
| C | Si | Mn | P | S | Al | Cr | Mo | |
| Minimum value | 0.60 | 1.68 | 0.72 | 0.016 | 0.004 | 0.005 | 0.75 | 0.08 |
| Maximum value | 0.62 | 1.83 | 0.75 | 0.021 | 0.009 | 0.006 | 0.79 | 0.10 |
| Mean value of | 0.61 | 1.73 | 0.73 | 0.019 | 0.007 | 0.006 | 0.77 | 0.09 |
5) Surface quality
The continuous casting billet is slowly cooled for more than 48 hours, and the surface of the continuous casting billet has no defects of surface cracks and the like, so that the surface quality requirement of producing hot-rolled round steel is completely met.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (6)
1. The mining wear-resistant KYNM500 steel is characterized by comprising the following chemical components in percentage by mass: 0.58-0.66% of C, 1.60-1.90% of Si, 0.65-0.85% of Mn, less than or equal to 0.025% of P, less than or equal to 0.025% of S, less than or equal to 0.060% of Al, 0.70-0.90% of Cr, 0.05-0.15% of Mo, less than or equal to 0.30% of Ni, less than or equal to 0.30% of Cu, less than or equal to 0.020% of Pb, less than or equal to 0.030% of Sn, and the balance of Fe and inevitable.
2. The preparation method of mining wear-resistant KYNM500 steel as claimed in claim 1, comprising:
1) production in a converter
In order to ensure the product quality and accurately control the components of the finished product, the molten iron of the converter is required to be: the phosphorus content is less than or equal to 0.13 percent and the sulfur content is less than or equal to 0.050 percent according to the mass percentage; adding a slagging auxiliary material in the smelting process of the converter, and carrying out deoxidation alloying according to the requirements of the finished product of the wear-resistant KYNM500 component for mine in the tapping process;
the carbon content, the phosphorus content and the tapping temperature of the molten steel at the end point of the converter are as follows:
the tapping temperature is 1608-; the carbon content is 0.06-0.10%, and the average is 0.07%; the phosphorus content is 0.011-0.020%, and the average content is 0.015%;
2) LF furnace production
The LF furnace refining in-place temperature is 1531-1546 ℃, and the average temperature is 1539 ℃; the refining dislocation temperature is 1572-; refining treatment time is 55-73 min; adding ferromolybdenum according to the standard component requirement in the later stage of refining;
3) VD furnace production
And the molten steel is subjected to vacuum degassing treatment in a VD furnace, so that the content of harmful gases in the steel is further reduced, the cleanliness of the steel is improved, and the gas content requirement is as follows: [ O ] is less than or equal to 20 ppm; the content of [ N ] is less than or equal to 80 ppm; [H] less than or equal to 2.5 ppm; feeding a calcium-silicon wire to denature impurities; requiring that the deep vacuum time of VD furnace smelting is more than 13min, the deep vacuum degree is less than or equal to 0.10Kpa, and the soft blowing time is 13-15 min; soft blowing flow rate is 80-200 Nl/min; the temperature of the upper stage 1517-1523 ℃;
4) continuous casting production
The superheat degree is controlled between 20 and 33 ℃ in continuous casting production, and the drawing speed is between 0.65 and 0.67 m/min; and (5) slowly cooling the continuous casting billet for more than 48 hours.
3. The preparation method of claim 2, wherein the refining in-situ temperature of the LF furnace in the step 2) is 1539 ℃, the refining ex-situ temperature is 1577 ℃, and the refining treatment time is 60 min.
4. The mining abrasion-resistant KYNM500 steel as claimed in claim 1, wherein the soft blowing time in step 3) is 14 min; the soft blowing flow rate is 140 Nl/min; the upper stage temperature was 1518 ℃.
5. The method according to claim 1, wherein the inclusions are denatured by feeding 100m of the calcium silicate wire after refining in step 3).
6. The mining wear-resistant KYNM500 steel as claimed in claim 1, wherein the slagging auxiliary material comprises: 0-80kg of calcium carbide and 0-80kg of fluorite.
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| CN201911116282.0A CN110952025A (en) | 2019-11-15 | 2019-11-15 | Mining wear-resistant KYNM500 steel and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440996A (en) * | 2020-04-16 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | 6-8 mm TMCP (thermal mechanical control processing) on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate 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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| EP0348633A1 (en) * | 1988-04-30 | 1990-01-03 | Qinghua University | Air-hardenable steels with a duplex bainite-martensite microstructure |
| JP2000212721A (en) * | 1998-11-19 | 2000-08-02 | Nsk Ltd | Rolling member excellent in wear resistance |
| CN103627955A (en) * | 2013-11-25 | 2014-03-12 | 内蒙古包钢钢联股份有限公司 | Steel for high-carbon wear-resisting ball material and production method thereof |
| CN106834959A (en) * | 2016-12-28 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | High hardness wear-resisting ball material steel and its production method |
-
2019
- 2019-11-15 CN CN201911116282.0A patent/CN110952025A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0348633A1 (en) * | 1988-04-30 | 1990-01-03 | Qinghua University | Air-hardenable steels with a duplex bainite-martensite microstructure |
| JP2000212721A (en) * | 1998-11-19 | 2000-08-02 | Nsk Ltd | Rolling member excellent in wear resistance |
| CN103627955A (en) * | 2013-11-25 | 2014-03-12 | 内蒙古包钢钢联股份有限公司 | Steel for high-carbon wear-resisting ball material and production method thereof |
| CN106834959A (en) * | 2016-12-28 | 2017-06-13 | 内蒙古包钢钢联股份有限公司 | High hardness wear-resisting ball material steel and its production method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111440996A (en) * | 2020-04-16 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | 6-8 mm TMCP (thermal mechanical control processing) on-line quenching low-yield-ratio high-strength wear-resistant steel NM400 coiled plate 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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Application publication date: 20200403 |