CN113046512A - Method for producing high-end rare earth bearing steel pipe in whole process - Google Patents
Method for producing high-end rare earth bearing steel pipe in whole process Download PDFInfo
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- CN113046512A CN113046512A CN202110251363.2A CN202110251363A CN113046512A CN 113046512 A CN113046512 A CN 113046512A CN 202110251363 A CN202110251363 A CN 202110251363A CN 113046512 A CN113046512 A CN 113046512A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a method for producing a high-end rare earth bearing steel pipe through a whole process, which belongs to the technical field of metallurgy and forming, and comprises the following steps of (Wt%) 90% of blast furnace molten iron and 10% of high-quality scrap steel as raw materials: molten iron pretreatment → smelting in a top-bottom combined blown converter → refining in an LF furnace → VD vacuum treatment → round billet continuous casting → sizing cutting → heating of pipe blank → mushroom type perforation → continuous rolled pipe → micro tension sizing → cooling of a cooling bed → sizing sawing → hydrostatic test → nondestructive inspection; the product of the invention has the characteristics of low production cost, low impurity content and high dimensional precision. The gas oxygen in the finished product pipe prepared by the method is less than or equal to 10PPm, and the nitrogen is less than or equal to 50 PPm; the A, B, C, D, DS types of non-metallic inclusions are all less than or equal to 1.5 grade; the net-shaped and band-shaped carbide is less than or equal to 2.0 grade.
Description
Technical Field
The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a method for producing a high-end rare earth bearing steel pipe through a whole process.
Background
The bearing steel is required to have high and uniform hardness and wear resistance and high elastic limit, and the bearing steel has strict requirements on the uniformity of chemical components in the steel, the content and distribution of non-metallic inclusions, the distribution of carbides and the like; the excellent comprehensive performance of the alloy depends on the aspects of steel purity, structure, grain refinement degree and the like, so the control of material components, non-metal inclusions and structure is realized through the process control of molten iron pretreatment, a converter, an LF furnace, VD vacuum treatment, continuous casting, heating, rolling and the like.
Disclosure of Invention
The invention aims to provide a method for producing a high-end rare earth bearing steel pipe in a whole process, which can meet the process requirements of users and produce the rare earth bearing steel pipe with high dimensional accuracy.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for producing a high-end rare earth bearing steel pipe in a whole process comprises the following steps: firstly, pretreating blast furnace molten iron, then adding a top-bottom combined blowing converter for smelting, then putting the smelted molten steel into a ladle, feeding the molten steel into an LF furnace station for refining, feeding the molten steel into a VD station for vacuum degassing treatment after the refining is finished, then carrying out round billet continuous casting, cutting a continuous casting billet into a pipe blank, then heating the continuous casting pipe blank, then perforating and continuously rolling the heated pipe blank to form a continuously rolled pipe, then sizing the rolled pipe, then feeding the pipe blank into a cooling bed for cooling, then carrying out fixed-length saw cutting, and sequentially carrying out hydraulic test and nondestructive flaw detection, wherein qualified products are finished products of high-end rare earth bearing steel pipes produced in the whole process.
Further, the specific process comprises the following steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF furnace refining → VD vacuum treatment → round billet continuous casting → sizing cutting → pipe blank heating → mushroom type perforation → PQF continuous rolling pipe → micro tension sizing → cooling bed cooling → sizing sawing → hydrostatic test → nondestructive inspection.
Further, the method specifically comprises the following steps:
s1, pretreating blast furnace molten iron to ensure that P in the molten iron is less than or equal to 0.120%; less than or equal to 0.050 percent of S, less than or equal to 0.002 percent of harmful elements Pb, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.005 percent of Sb and less than or equal to 0.005 percent of Bi;
s2, adding the pretreated molten iron into a top-bottom combined blown converter, smelting by adopting a single slag process, controlling the final slag alkalinity and the end point target, carrying out deoxidation alloying in the tapping process, wherein the final deoxidation adopts an aluminum deoxidation process, slag is required to be blocked or removed in the tapping process, the tapping carbon is more than or equal to 0.20 percent, the tapping temperature is more than or equal to 1610 ℃, and the slag amount is less than 2 kg/t;
s3, refining in an LF (ladle furnace): blowing Ar normally in the whole refining process as required, and heating and raising the temperature by adopting a mode of gradually increasing the temperature raising speed from a low level to a high level; oxygen in the aluminum granules is used for deslagging and is added in batches in the smelting process; adjusting components according to the sample in position, adjusting slag system, and ensuring the alkalinity to be 4.5-5.5; al in place is more than or equal to 0.04 percent, and a calcium silicon wire of 100m is fed when LF is out of place;
s4, keeping the bottom to be soft-blown with Ar after the refining of the LF furnace is finished, and adding a predetermined amount of rare earth alloy;
s5, VD vacuum treatment: the vacuum degree is less than or equal to 0.10KPa, the deep vacuum time is more than or equal to 15 minutes, and the soft blowing time after wire feeding is more than or equal to 15 minutes; the flow of the soft argon blowing is strictly controlled after the air is broken, the molten steel cannot be exposed, and secondary oxidation is prevented;
s6, performing round billet continuous casting on the molten steel subjected to VD vacuum treatment, and adopting constant-speed control of low drawing speed, electromagnetic stirring and full-process protection pouring process; controlling the superheat degree delta T of the molten steel to be less than or equal to 30 ℃; specific water production: 0.30L/kg; sealing the sliding water port of the bale by adopting a graphite sealing bowl; drawing steel with a low drawing speed on the phi 200 section, wherein the drawing speed is in a range of 1.2m/min-1.50 m/min; the casting blank enters a slow cooling pit for slow cooling, and the slow cooling time is more than or equal to 72 hours;
s7, the standard qualified by the will-change inspection is
The tube blank is made into a tube, and the tube making process is as follows:
will be specified as
The tube blank is put into an annular heating furnace for heating, the charging temperature is less than or equal to 850 ℃, the soaking temperature is less than or equal to 1220 ℃, and the total heating time is more than or equal to 5 hours;
s8, heating to the specification of
The tube blank is subjected to bacterial perforation and then to
And continuously rolling and sizing on a PQF pipe rolling unit, wherein the temperature control range of the sized steel pipe is more than or equal to 820 ℃.
Further, in step S2, 400kg of top slag lime, 150kg of aluminum ingot and 100kg of fluorite pellets were added to the converter.
Furthermore, the blast furnace molten iron with the weight ratio of 90 percent and the high-quality scrap steel with the weight ratio of 10 percent are used as raw materials.
Further, the blast furnace molten iron is pretreated, and then the blast furnace molten iron and scrap steel are added into a top-bottom combined blown converter for smelting.
Further, the chemical components of the tube blank are as follows according to the weight percentage: 0.96-1.05% of C, 0.15-0.35% of Si, 0.30-0.45% of Mn, 1.45-1.60% of Cr, 0.0005-0.0015% of Ce, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.002% of Pb, less than or equal to 0.005% of Ti, and the balance of Fe and trace impurity elements.
Further, the rare earth alloy is a Ce-Fe alloy.
Compared with the prior art, the invention has the beneficial technical effects that:
firstly, 90% of blast furnace molten iron and 10% of high-quality scrap steel are used as raw materials, the content of impurity elements is relatively low, and noble elements Mo, Nb, Cu and Ni are not contained, so that the production difficulty of the steel pipe is relatively low, and the production cost is relatively low;
secondly, a series of technical measures such as electromagnetic stirring, stacking slow cooling, scientific heating temperature, mature pipe rolling process, accurate forming of steel pipes and the like are adopted;
thirdly, a series of technical measures such as blast furnace molten iron, high-quality scrap steel, molten iron pretreatment, converter final slag alkalinity control, white slag refining, deep vacuum treatment, proper amount of CaSi wires, rare earth element Ce, soft blowing Ar, full-stroke protection pouring and the like are adopted, so that the inclusion content of the steel pipe is relatively low;
a series of technical measures such as continuous casting of the round pipe billet, stacking and slow cooling, accurate centering, bacteria type perforation, PQF continuous pipe rolling, micro-tension diameter reduction, whole-process online detection and the like are adopted, so that the size precision of the steel pipe is relatively high;
fifthly, the special component design of the rare earth element Ce, pure steel, electromagnetic stirring, ideal cast structure, mature tube rolling process and temperature straightening are carried out, so that the steel tube has excellent performance, and the specific performance indexes are as follows:
the oxygen content of the gas in the finished product pipe is less than or equal to 10PPm, and the nitrogen content is less than or equal to 50 PPm; the A, B, C, D, DS types of non-metallic inclusions are all less than or equal to 1.5 grade; the net-shaped and band-shaped carbide is less than or equal to 2.0 grade.
Aiming at the problems in the background technology, the invention well solves the technical problems and makes remarkable progress through the technical measures of 'unique chemical component design and unique production process taking blast furnace molten iron as raw material'.
Detailed Description
The present invention will be described in further detail with reference to examples 1 to 2.
A method for producing a high-end rare earth bearing steel pipe in a whole process comprises the following raw materials in percentage by weight: the blast furnace molten iron accounts for 90 percent, and the high-quality scrap steel accounts for 10 percent;
the production process flow sequence is as follows: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF furnace refining → VD vacuum treatment → round billet continuous casting → sizing cutting → pipe blank heating → mushroom type perforation → PQF continuous rolling pipe → micro-expansion force sizing → cooling bed cooling → sizing sawing → hydrostatic test → nondestructive inspection.
The specific production process flow is briefly described as follows:
pretreating molten iron, wherein P in the molten iron is 0.110%; and S is 0.045%.
Adding the pretreated molten iron into a top-bottom combined blown converter, adding 10 percent (by weight) of high-quality scrap steel, smelting by adopting a single slag process, controlling final slag alkalinity and a terminal point target, carrying out deoxidation alloying in the tapping process, carrying out aluminum deoxidation process in the final deoxidation, pushing off slag and skimming slag in the tapping process, wherein the tapping carbon is 0.21 percent, and the tapping temperature is 1620 ℃; 400kg of top slag lime, 150kg of aluminum ingot and 100kg of fluorite balls are added into the converter.
Blowing Ar normally in the whole refining process as required, and heating and raising the temperature by adopting a mode of gradually increasing the temperature raising speed from a low level to a high level; oxygen in the aluminum granules is used for deslagging, and 80kg of oxygen is added in batches in the smelting process; adjusting components according to the sample in position, adjusting slag system, and ensuring the alkalinity to be 4.5-5.5; in-place Al0.041%, and feeding 100m calcium silicate wire when LF is out-of-place.
After the refining of the LF furnace is finished, keeping the bottom to perform soft blowing of Ar, and adding 5kg of rare earth alloy containing 50% of rare earth; performing VD vacuum treatment: the vacuum degree is 0.06KPa, the deep vacuum time is 15 minutes, and the soft blowing time is 15 minutes after the wire feeding;
performing round billet continuous casting on the molten steel subjected to VD vacuum treatment, and adopting constant-speed control of low drawing speed, electromagnetic stirring and whole-process protection pouring process; controlling the superheat degree delta T of the molten steel to be 25 ℃; specific water production: 0.30L/kg; sealing the sliding water port of the bale by adopting a graphite sealing bowl; drawing speed of phi 200 section is 1.2m/min-1.50 m/min; the casting blank enters a slow cooling pit for slow cooling, and the slow cooling time is 72 hours;
to the specification of
The tube blank is sampled and examined, and the chemical composition test results (weight percentage content) are shown in table 2.
TABLE 2 chemical composition test results (wt%) of tube blanks
| Examples | C | Si | Mn | P | S | Cr | Ce | Ti | Pb |
| Example 1 | 0.97 | 0.24 | 0.36 | 0.017 | 0.005 | 1.34 | 0.0011 | 0.0030 | 0.0009 |
| Example 2 | 1.00 | 0.31 | 0.40 | 0.019 | 0.006 | 1.40 | 0.0012 | 0.0028 | 0.0012 |
And (4) sulfur printing: all the products do not exceed 1.5 grade, and the products are qualified through low-power inspection.
The standard qualified by chemical examination is
The tube blank is made into a tube, and the tube making process is as follows:
will be specified as
The tube blank is put into an annular heating furnace for heating, the temperature of each section of a preheating section, a heating section, a soaking section and the like of the annular heating furnace is continuously checked and controlled, the thorough and uniform heating is ensured, the overheating is avoided, the control range of the temperature of each section is shown in a table 3, and the total heating time is 5.5;
TABLE 3 temperature control (. degree. C.) of each stage of the annular furnace
| Preheating I section | Preheating stage II | Heating stage I | Heating stage II | Soaking section I | Soaking II section |
| 750 | 850～1000 | 1000～1100 | 1100～1150 | 1150～1200 | 1200～1220 |
The temperature of each section of the annular heating furnace is automatically controlled and recorded by a microcomputer.
The hot tool must be measured before use, and the roller way must be checked and processed before rolling, so as to avoid scratching the pipe wall.
The heated specification is
The tube blank is subjected to bacterial perforation and then to
Continuously rolling the tube on a PQF tube rolling mill, sizing and forming the tube into a finished product with the specification
The seamless steel pipe of (1) is subjected to thermal sampling once per batch, and the geometric dimension is checked.
The specification of the production process is
The seamless steel pipe is subjected to nondestructive flaw detection and hydrostatic test in sequence, and then the finished product of the high-end rare earth bearing steel pipe produced by the whole process is formed. The prepared sample is used for testing the mechanical property and the metallographic property.
The specifications of the products produced in the examples 1 to 2 are verified to be
The results of the seamless steel pipe testing are shown in tables 4 to 7.
TABLE 4 bearing steel pipe chemical composition test results (% by weight)
| Examples | C | Si | Mn | P | S | Cr | Ce | Ti | Pb |
| Example 1 | 0.97 | 0.24 | 0.36 | 0.017 | 0.005 | 1.34 | 0.0011 | 0.0030 | 0.0009 |
| Example 2 | 1.00 | 0.31 | 0.40 | 0.019 | 0.006 | 1.40 | 0.0012 | 0.0028 | 0.0012 |
TABLE 5 finished pipe gas content test results (PPm)
| Examples | H | O | N |
| Example 1 | 1.1 | 9 | 45 |
| Example 2 | 0.80 | 8 | 40 |
TABLE 6 detection rating result (grade) of non-metallic inclusion in finished pipe
| Examples | Class A subfamily | Class B subfamily | Class C subfamily | Class D subfamily | Class DS system |
| Example 1 | 0.5 | 1.0 | 0 | 0.5 | 0 |
| Example 2 | 0.5 | 0.5 | 0 | 0.5 | 0 |
TABLE 7 finished pipe carbide test rating results (grade)
| Examples | Net shape | Strip shape | Liquid chromatography |
| Example 1 | 2.0 | 1.0 | 0 |
| Example 2 | 1.5 | 2.0 | 0 |
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (8)
1. A method for producing a high-end rare earth bearing steel pipe in a whole process is characterized by comprising the following steps: firstly, pretreating blast furnace molten iron, then adding a top-bottom combined blowing converter for smelting, then putting the smelted molten steel into a ladle, feeding the molten steel into an LF furnace station for refining, feeding the molten steel into a VD station for vacuum degassing treatment after the refining is finished, then carrying out round billet continuous casting, cutting a continuous casting billet into a pipe blank, then heating the continuous casting pipe blank, then perforating and continuously rolling the heated pipe blank to form a continuously rolled pipe, then sizing the rolled pipe, then feeding the pipe blank into a cooling bed for cooling, then carrying out fixed-length saw cutting, and sequentially carrying out hydraulic test and nondestructive flaw detection, wherein qualified products are finished products of high-end rare earth bearing steel pipes produced in the whole process.
2. The full-process production method of the high-end rare earth bearing steel pipe according to claim 1, wherein the specific process comprises the following steps: molten iron pretreatment → smelting in a top-bottom combined blown converter → LF furnace refining → VD vacuum treatment → round billet continuous casting → sizing cutting → pipe blank heating → mushroom type perforation → PQF continuous rolling pipe → micro tension sizing → cooling bed cooling → sizing sawing → hydrostatic test → nondestructive inspection.
3. The full-process production method of the high-end rare earth bearing steel pipe according to claim 2, characterized by comprising the following steps:
s1, pretreating blast furnace molten iron to ensure that P in the molten iron is less than or equal to 0.120%; less than or equal to 0.050 percent of S, less than or equal to 0.002 percent of harmful elements Pb, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.005 percent of Sb and less than or equal to 0.005 percent of Bi;
s2, adding the pretreated molten iron into a top-bottom combined blown converter, smelting by adopting a single slag process, controlling the final slag alkalinity and the end point target, carrying out deoxidation alloying in the tapping process, wherein the final deoxidation adopts an aluminum deoxidation process, slag is required to be blocked or removed in the tapping process, the tapping carbon is more than or equal to 0.20 percent, the tapping temperature is more than or equal to 1610 ℃, and the slag amount is less than 2 kg/t;
s3, refining in an LF (ladle furnace): blowing Ar normally in the whole refining process as required, and heating and raising the temperature by adopting a mode of gradually increasing the temperature raising speed from a low level to a high level; oxygen in the aluminum granules is used for deslagging and is added in batches in the smelting process; adjusting components according to the sample in position, adjusting slag system, and ensuring the alkalinity to be 4.5-5.5; al in place is more than or equal to 0.04 percent, and a calcium silicon wire of 100m is fed when LF is out of place;
s4, keeping the bottom to be soft-blown with Ar after the refining of the LF furnace is finished, and adding a predetermined amount of rare earth alloy;
s5, VD vacuum treatment: the vacuum degree is less than or equal to 0.10KPa, the deep vacuum time is more than or equal to 15 minutes, and the soft blowing time after wire feeding is more than or equal to 15 minutes; the flow of the soft argon blowing is strictly controlled after the air is broken, the molten steel cannot be exposed, and secondary oxidation is prevented;
s6, performing round billet continuous casting on the molten steel subjected to VD vacuum treatment, and adopting constant-speed control of low drawing speed, electromagnetic stirring and full-process protection pouring process; controlling the superheat degree delta T of the molten steel to be less than or equal to 30 ℃; specific water production: 0.30L/kg; sealing the sliding water port of the bale by adopting a graphite sealing bowl; drawing steel with a lower drawing speed on the section, wherein the drawing speed is within a range of 1.2m/min-1.50 m/min; the casting blank enters a slow cooling pit for slow cooling, and the slow cooling time is more than or equal to 72 hours;
s7, placing the tube blank into a heating furnace for heating, wherein the charging temperature is less than or equal to 850 ℃, the soaking temperature is less than or equal to 1220 ℃, and the total heating time is more than or equal to 5 hours.
S8, performing mushroom perforation on the heated tube blank, then performing continuous rolling and sizing on a PQF tube rolling mill unit, wherein the temperature control range of the steel tube after sizing is more than or equal to 820 ℃.
4. The method for producing a high-end rare earth bearing steel pipe through the whole process according to claim 3, wherein 400kg of top dross lime, 150kg of aluminum ingot and 100kg of fluorite pellets are added in the converter in the step S2.
5. The method for producing a high-end rare earth bearing steel pipe through the whole process according to any one of claims 1 to 4, wherein the raw materials are molten iron of a blast furnace in an amount of 90% by weight and scrap steel in an amount of 10% by weight.
6. The method for producing the high-end rare earth bearing steel pipe through the whole process according to claim 5, wherein molten iron in a blast furnace is pretreated and then added into a top-bottom combined blown converter together with scrap steel for smelting.
7. The full-process production method of the high-end rare earth bearing steel pipe according to claim 5, wherein the chemical components of the pipe blank are as follows according to weight percentage: 0.96-1.05% of C, 0.15-0.35% of Si, 0.30-0.45% of Mn0.45%, 1.45-1.60% of Cr, 0.0005-0.0015% of Ce, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.002% of Pb, less than or equal to 0.005% of Ti, and the balance of Fe and trace impurity elements.
8. The full process method for producing a high end rare earth bearing steel pipe according to claim 3, wherein the rare earth alloy is a Ce-Fe alloy.
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| CN115094189A (en) * | 2022-05-06 | 2022-09-23 | 包头钢铁（集团）有限责任公司 | Method for changing appearance of nitride in bearing steel by adopting rare earth La |
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| CN117344220A (en) * | 2023-09-26 | 2024-01-05 | 包头钢铁（集团）有限责任公司 | Rare earth-containing intermediate steel grade petroleum casing pipe and production method thereof |
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