CN115591940A - Method for rolling KYNM480RE mining rare earth wear-resistant steel - Google Patents
Method for rolling KYNM480RE mining rare earth wear-resistant steel Download PDFInfo
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- CN115591940A CN115591940A CN202211295667.XA CN202211295667A CN115591940A CN 115591940 A CN115591940 A CN 115591940A CN 202211295667 A CN202211295667 A CN 202211295667A CN 115591940 A CN115591940 A CN 115591940A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 47
- 239000010959 steel Substances 0.000 title claims abstract description 47
- 238000005096 rolling process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 23
- 238000005065 mining Methods 0.000 title claims abstract description 22
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 239000000126 substance Substances 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims description 13
- 238000010583 slow cooling Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 238000013021 overheating Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000007774 longterm Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007550 Rockwell hardness test Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
- B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
-
- 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
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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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
-
- 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
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- 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
- 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
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- 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
-
- 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
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)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a rolling method of KYNM480RE mining rare earth wear-resistant steel, which comprises the following chemical components in percentage by mass: 0.85 to 0.95 percent of C, 0.20 to 0.35 percent of Si, 0.80 to 0.90 percent of Mn0.020 percent, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.50 to 0.65 percent of Cr, 0.0005 to 0.0020 percent of RE, less than or equal to 0.060 percent of Al, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, and less than or equal to 2.0ppm of H; [ O ] is less than or equal to 20ppm; the content of [ N ] is less than or equal to 80ppm, and the balance of Fe and inevitable impurities; the rolling method is provided to control the temperature in the heating and rolling processes to be proper. The KYNM480RE mining rare earth wear-resistant steel provided by the invention has excellent wear resistance and toughness, and can greatly prolong the service life.
Description
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a rolling method of KYNM480RE mining rare earth wear-resistant steel.
Background
The wear-resistant steel ball is a consumable product and is mainly used for grinding materials to enable the materials to be ground to be finer so as to reach the use standard. The annual consumption of the steel balls in China is 300-500 ten thousand tons, which is a big consumption country of the steel balls. China mainly casts steel balls for a long time, and forged and rolled steel balls with high production efficiency and stable product quality are rapidly developed in recent years.
At present, research proves that the comprehensive performances of improving the structure of the wear-resistant steel, inhibiting crack propagation, improving the wear resistance of contact under load and the like can be realized by adding a proper amount of rare earth elements into the mining wear-resistant steel. However, the wear-resistant steel balls produced in the prior art still have the defects of low heat treatment hardness, poor impact resistance, low breakage resistance of the steel balls and the like, the service life of the wear-resistant steel balls is shortened, and the long-term stable operation of the ball mill is influenced.
Disclosure of Invention
Aiming at one or more problems in the prior art, the invention provides a rolling method of KYNM480RE mining rare earth wear-resistant steel, wherein the KYNM480RE mining rare earth wear-resistant steel comprises the following chemical components in percentage by mass: 0.85 to 0.95 percent of C, 0.20 to 0.35 percent of Si, 0.80 to 0.90 percent of Mn0.020 percent, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.50 to 0.65 percent of Cr, 0.0005 to 0.0020 percent of RE, less than or equal to 0.060 percent of Al, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, and less than or equal to 2.0ppm of H; [ O ] is less than or equal to 20ppm; the content of [ N ] is less than or equal to 80ppm, and the balance of Fe and inevitable impurities;
the rolling method comprises the following steps: heating, rolling and cooling a continuous casting billet, wherein:
in the continuous casting billet heating procedure, the preheating section is less than or equal to 850 ℃, the first heating section is 1160-1180 ℃, the second heating section is 1120-1240 ℃, the soaking section is 1220-1240 ℃, the heating section adopts slow heating, overburning or overheating is forbidden, and the soaking time of the continuous casting billet is ensured to be more than or equal to 45min;
in the rolling procedure, a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 tandem mill train rolling process are adopted, wherein the starting temperature of the phi 850 cogging mill is controlled to be 1140-1180 ℃, the starting temperature of the phi 700mm rolling mill is controlled to be 1000-1030 ℃, and the finishing temperature is controlled to be more than or equal to 850 ℃;
in the cooling procedure, after rolling, the steel is put into a slow cooling pit for slow cooling at the temperature of more than or equal to 500 ℃.
The invention also provides KYNM480RE mining rare earth wear-resistant steel which is obtained by rolling through the rolling method.
In some embodiments, the hardness of the KYNM480RE mining rare earth wear-resistant steel after heat treatment meets the following requirements: the surface hardness is more than or equal to 63HRC, and the core hardness is more than or equal to 62HRC; the normal temperature impact toughness after heat treatment meets the following requirements: not less than 15J/cm 2 。
The embodiment results show that the hardness of the KYNM480RE mining rare earth wear-resistant steel obtained by the method after heat treatment (the KYNM480RE mining rare earth wear-resistant steel obtained after hot rolling is kept at 850-870 ℃ for 2-3 hours, then water quenching is carried out, the quenched steel ball is heated to 200-220 ℃ for tempering treatment, the steel ball is kept at the temperature for 1-2 hours, and then the steel ball is moved into a slow cooling pit to be slowly cooled to room temperature to obtain a finished product after heat treatment) meets the following requirements: the surface hardness is more than or equal to 63HRC, and the core hardness is more than or equal to 62HRC; and the impact toughness of the prepared KYNM480RE mining rare earth wear-resistant steel after heat treatment meets the following requirements (normal temperature): not less than 15J (J/cm) 2 ) The ball mill has better wear resistance and toughness, can effectively ensure the long-term stable operation of the ball mill, and prolongs the service life of the wear-resistant steel ball.
Detailed Description
The invention aims to provide a rolling method of KYNM480RE mining rare earth wear-resistant steel so as to obtain the KYNM480RE mining rare earth wear-resistant steel with excellent wear resistance and impact toughness.
The provided KYNM480RE mining rare earth wear-resistant steel comprises the following chemical components in percentage by mass: 0.85 to 0.95 percent of C, 0.20 to 0.35 percent of Si, 0.80 to 0.90 percent of Mn0.020 percent, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.50 to 0.65 percent of Cr, 0.0005 to 0.0020 percent of RE, less than or equal to 0.060 percent of Al, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, and less than or equal to 2.0ppm of H; [ O ] is less than or equal to 20ppm; the content of N is less than or equal to 80ppm, and the balance of Fe and inevitable impurities.
The provided rolling method of KYNM480RE mining rare earth wear-resistant steel comprises the following process steps: heating, rolling and cooling a continuous casting billet, wherein: the continuous casting billet can be obtained according to the following production process: 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, wherein the processes can be carried out according to the conventional process steps for producing wear-resistant steel balls, and the obtained continuous casting blank is phi 245 mm-phi 350mm and 280 x 380mm;
in the continuous casting billet heating procedure, the preheating section is less than or equal to 850 ℃, the first heating section is 1160-1180 ℃, the second heating section is 1120-1240 ℃, the soaking section is 1220-1240 ℃, the heating section adopts slow heating, overburning or overheating is forbidden, meanwhile, the soaking time of the continuous casting billet is ensured to be more than or equal to 45min, and the uniform temperature inside and outside the continuous casting billet is ensured;
in the rolling procedure, a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 tandem mill train rolling process are adopted, wherein the starting temperature of the phi 850 cogging mill is controlled to be 1140-1180 ℃, the starting temperature of the phi 700mm rolling mill is controlled to be 1000-1030 ℃, and the finishing temperature is controlled to be more than or equal to 850 ℃;
in the cooling procedure, after rolling, the steel is put into a slow cooling pit for slow cooling at the temperature of more than or equal to 500 ℃.
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.
Produced according to the process provided above, according to the chemical composition of examples 1-3 and comparative example 1 listed in table 1 below.
Table 1: chemical compositions and contents (%)
1) Continuous casting billet heating process
The heating time and heating rate of the slab were determined as shown in table 2 below.
Table 2: heating temperature and soaking time
2) Phi 850 cogging mill and phi 700mm multiplied by 3+ phi 550mm multiplied by 4 tandem 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 steel is slowly cooled for more than 48 hours, and the surface of the hot rolled steel has no defects such as surface cracks and the like, thereby completely meeting the requirements of technical protocols.
4) Performance test
According to the technical protocol, impact and hardness tests are carried out on the heat-treated steel (the hot rolled steel is kept at about 860 ℃ for 2-3 hours, then water quenching is carried out, the quenched steel ball is heated to about 210 ℃ for tempering treatment, and is moved into a slow cooling pit for slowly cooling to room temperature after being kept for 1-2 hours, so as to obtain a heat-treated finished product), and the specific test is shown in the following tables 4 and 5.
Table 4: rockwell hardness test results (Unit: HRC)
Table 5: impact test results (unit: J/cm) 2 )
From the above table 4 and table 5, it can be seen that the heat treatment hardness of the KYNM480RE mining rare earth wear-resistant steel obtained by the rolling method of the present invention satisfies: the surface hardness is more than or equal to 63HRC, and the core hardness is more than or equal to 62HRC; and the impact toughness of the prepared KYNM480RE mining rare earth wear-resistant steel in heat treatment meets the following requirements (normal temperature): not less than 15J (J/cm) 2 ) Therefore, the ball mill has excellent wear resistance and toughness, and can effectively ensure the long-term stable operation of the ball mill. However, in comparison with example 1, comparative example 1 was produced according to the conventional rolling process of wear-resistant steel balls, although the same amount of rare earth elements was also added to the chemical composition, and the hardness (surface hardness and core hardness) and impact toughness properties of the obtained wear-resistant steel were relatively low.
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 modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. 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 (3)
1. The rolling method of the KYNM480RE mining rare earth wear-resistant steel is characterized by comprising the following chemical components in percentage by mass: 0.85 to 0.95 percent of C, 0.20 to 0.35 percent of Si, 0.80 to 0.90 percent of Mn0.020 percent, less than or equal to 0.020 percent of P, less than or equal to 0.020 percent of S, 0.50 to 0.65 percent of Cr, 0.0005 to 0.0020 percent of RE, less than or equal to 0.060 percent of Al, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, and less than or equal to 2.0ppm of H; [ O ] is less than or equal to 20ppm; the content of [ N ] is less than or equal to 80ppm, and the balance is Fe and inevitable impurities;
the rolling method comprises the following steps: heating, rolling and cooling a continuous casting billet, wherein:
in the continuous casting billet heating procedure, the preheating section is less than or equal to 850 ℃, the first heating section is 1160-1180 ℃, the second heating section is 1120-1240 ℃, the soaking section is 1220-1240 ℃, the heating section adopts slow heating, overburning or overheating is forbidden, and the soaking time of the continuous casting billet is ensured to be more than or equal to 45min;
in the rolling procedure, a phi 850 cogging mill and a phi 700mm multiplied by 3+ phi 550mm multiplied by 4 tandem mill train rolling process are adopted, wherein the starting temperature of the phi 850 cogging mill is controlled to be 1140-1180 ℃, the starting temperature of the phi 700mm rolling mill is controlled to be 1000-1030 ℃, and the finishing temperature is controlled to be more than or equal to 850 ℃;
in the cooling procedure, after rolling, the steel is put into a slow cooling pit for slow cooling at the temperature of more than or equal to 500 ℃.
2. KYNM480RE mining rare earth wear-resistant steel obtained by rolling according to the rolling method of claim 1.
3. The KYNM480RE mining rare earth wear-resistant steel as claimed in claim 2, which has hardness after heat treatment satisfying: the surface hardness is more than or equal to 63HRC, and the core hardness is more than or equal to 62HRC; the normal temperature impact toughness after heat treatment meets the following requirements: not less than 15J/cm 2 。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211295667.XA CN115591940B (en) | 2022-10-21 | 2022-10-21 | Rolling method of KYNM RE 480RE mining rare earth wear-resistant steel |
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| CN202211295667.XA CN115591940B (en) | 2022-10-21 | 2022-10-21 | Rolling method of KYNM RE 480RE mining rare earth wear-resistant steel |
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| CN115591940A true CN115591940A (en) | 2023-01-13 |
| CN115591940B CN115591940B (en) | 2024-08-27 |
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| CN115591940B (en) | 2024-08-27 |
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