CN116497284B - High-strength bearing steel wide steel belt for automobile and preparation method thereof - Google Patents
High-strength bearing steel wide steel belt for automobile and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 277
- 239000010959 steel Substances 0.000 title claims abstract description 277
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 30
- 238000009749 continuous casting Methods 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 24
- 230000008569 process Effects 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 18
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 18
- 239000004571 lime Substances 0.000 claims description 18
- 238000009849 vacuum degassing Methods 0.000 claims description 18
- 238000005275 alloying Methods 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229910052742 iron Inorganic materials 0.000 claims description 16
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 15
- 229910052786 argon Inorganic materials 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 13
- 238000007664 blowing Methods 0.000 claims description 12
- 238000009842 primary steelmaking Methods 0.000 claims description 12
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 11
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 11
- 238000005516 engineering process Methods 0.000 claims description 11
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 10
- 238000005096 rolling process Methods 0.000 claims description 10
- 235000019738 Limestone Nutrition 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 9
- 239000010436 fluorite Substances 0.000 claims description 9
- 239000006028 limestone Substances 0.000 claims description 9
- 239000001095 magnesium carbonate Substances 0.000 claims description 9
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 9
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 9
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000004484 Briquette Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 239000011651 chromium Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 239000000498 cooling water Substances 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 229910004762 CaSiO Inorganic materials 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001627 detrimental effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910017108 Fe—Fe Inorganic materials 0.000 description 1
- 229910000677 High-carbon steel Inorganic materials 0.000 description 1
- 206010057040 Temperature intolerance Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- -1 equipment Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000008543 heat sensitivity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000007514 turning Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention relates to the technical field of steel production, in particular to a high-strength wide bearing steel strip for an automobile and a preparation method thereof, wherein the components of the wide bearing steel strip comprise: c:0.99-1.07%, si:0.20-0.35%, mn:0.25-0.45%, S:0-0.010%; p:0-0.020%, cr:1.50-1.70%, ni:0.10-0.50%, als:0.010-0.060%, cu:0-0.20%, as:0-0.0080%, O:0-0.0015%, N:0-0.0060%, impurity: 0-0.5%, and the balance being Fe. The bearing steel wide steel strip prepared by the method has high strength, good hardenability and wear resistance, low inclusion content and high uniformity.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a high-strength bearing steel wide steel belt for an automobile and a preparation method thereof.
Background
The bearing is widely applied to industries such as machinery, transportation, aerospace and the like, promotes energy conservation and economic development, and has wide market prospect especially in the bearing steel production technology with fatigue resistance and low cost. Many steels used to make bearings, such as 20Cr, 20CrNiMo, 42CrMo, 70Mn, GCr15, etc., typically require carburization to make bearings from low strength steels, while high strength steels do not require carburization to make bearings. The release bearing is a key part of an automobile clutch, and the clutch is repeatedly sprung, so that the fatigue resistance requirement on steel is extremely high. The clutch made of the high-strength bearing steel has high performance uniformity and high wear resistance, and is very beneficial to the stable use of automobiles.
The raw materials of the bearing are traditionally round steel, and the steel strip is used as the raw material of the bearing ring through forging, extrusion, turning and other processes, and the technology developed in recent years is adopted. The production of the narrow steel strip of the high-strength bearing steel is relatively mature, but the production of the wide coiled plate is controlled by equipment capacity, technology and other factors, and the narrow steel strip is still in a research and development stage, and the literature is fresh. The development of the technology of the wide rolling plate is beneficial to the improvement of production efficiency and the reduction of manufacturing cost, and can obviously enhance the market competitiveness of the bearing industry. However, due to the high carbon and chromium content in bearing steels, the wider the slab is, the more likely it is to cause composition and structure segregation, as well as billet corner and edge cracking. In addition, wide bearing steel strips also have high inclusion content, product strength, hardenability, wear resistance fatigue life and uniformity that need to be further improved.
Disclosure of Invention
The technical problem solved by the invention is that the wider the slab is, the more easily the composition and the tissue segregation are caused, and the casting blank angle cracks and edge cracks are caused due to the high carbon and chromium content in the bearing steel; at least one of the problems of high inclusion content, high product strength, high hardenability, high wear resistance, high fatigue life and high uniformity of the wide bearing steel strip is required to be further improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-strength bearing steel wide steel belt for the automobile comprises the following components in percentage by weight: c:0.99-1.07%, si:0.20-0.35%, mn:0.25-0.45%, S:0-0.010%; p:0-0.020%, cr:1.50-1.70%, ni:0.10-0.50%, als:0.010-0.060%, cu:0-0.20%, as:0-0.0080%, O:0-0.0015%, N:0-0.0060%, impurity: 0-0.5%, and the balance being Fe.
Compared with the prior art, the invention improves the comprehensive performance of the steel strip by adding Cr, ni and other alloy elements into the components of the wide steel strip of the bearing steel; cr can form carbide with C so as to improve the hardenability and strength of steel, ni can strengthen ferrite and refine and increase pearlite, and the strength and fatigue resistance of steel are improved. Because the P element is easy to gather on the grain boundary and the surface of the steel strip, the grain boundary is embrittled, and the fatigue performance of the bearing is affected; o element is easy to form Al with Al 2 O 3 Inclusion to form CaSiO with Si and Ca 3 The silicate inclusions and Mg, si and other elements form oxide point-shaped inclusions, so that the fatigue life of the steel is influenced; s element easily forms sulfide in steel, so that the steel is hot and brittle; therefore, the invention adopts low P, low S and low O design in the components of the wide steel strip of the bearing steel, thereby ensuring that the wide steel strip of the bearing steel has higher fatigue resistance.
The invention also provides a preparation method of the high-strength bearing steel wide steel belt for the automobile, which comprises the following steps:
s1, carrying out primary smelting of oxygen blowing on a main raw material and a slag former in a converter to obtain primary steelmaking water; wherein the primary refining temperature is 1580-1680 ℃, the time is 20-40min, and the adding amount of the slag former is 89-160 Kg/ton of main raw material;
s2, adding ferrosilicon, aluminum iron and a carburant into the primary steelmaking water, and blowing argon to perform primary alloying to obtain primary alloyed molten steel;
s3, adding ferrosilicon, manganese metal, ferrochrome and carburant into the primary alloyed molten steel, performing secondary alloying, and then adding lime and fluorite for refining to obtain refined molten steel, wherein the refining time is 80-120min;
s4, vacuum degassing is carried out on the refined molten steel, a silicon-calcium wire and an aluminum wire are fed, argon is blown, and degassed molten steel is obtained;
s5, moving the degassed molten steel into a tundish for continuous casting to obtain a continuous casting blank;
and S6, heating the continuous casting blank, and then carrying out hot rolling and coiling to obtain a hot rolled steel strip, wherein the width of the hot rolled steel strip is 1000-1300mm, and the thickness of the hot rolled steel strip is 2.5-14mm.
Preferably, in the step S5, a two-cooling dynamic water distribution technology is adopted in the continuous casting process, and the blank drawing speed is 0.8-1.2m/min.
Preferably, in the step S6, the temperatures of the start section 20m and the end section 20m of the hot rolled steel strip during the coiling are 20 ℃ higher than the temperature of the intermediate section.
Preferably, in the step S6, the initial rolling temperature of the hot rolling is 1220-250 ℃, and the coiling temperature is 620-700 ℃.
Preferably, in the step S3, the refining temperature is 1550-1620 ℃.
Preferably, in the step S4, in the process of vacuum degassing the refined molten steel, the vacuum degree of the vacuum refining furnace is 100-300Pa, and the vacuum maintaining time is 15-25min.
Preferably, in the step S1, the main raw materials comprise the following components in percentage by mass: molten iron: 85-90%, scrap steel: 10-15%, nickel plate: 0.15-0.45%; the slag former consists of active lime, limestone, magnesite, sinter and OG mud pressing blocks; the addition amounts of the components in the slag former are respectively as follows: active lime 40-60 Kg/ton main raw material, limestone 20-40 Kg/ton main raw material, magnesite 7-15 Kg/ton main raw material, sinter 7-15 Kg/ton main raw material, OG mud pressing block 15-30 Kg/ton main raw material.
Preferably, in the step S2, the adding amount of the aluminum iron is 0.8-2.0 Kg/ton of primary molten steel, and the adding amount of the carburant is 11.5-13 Kg/ton of primary molten steel.
Preferably, in the step S3, the addition amount of the ferrosilicon is 2.4-3.5 Kg/ton of primary alloyed molten steel, the addition amount of the manganese metal is 2.6-4.2 Kg/ton of primary alloyed molten steel, the addition amount of the ferrochrome is 27-30 Kg/ton of primary alloyed molten steel, the addition amount of the carburant is 0.5-1 Kg/ton of primary alloyed molten steel, the addition amount of the lime is 8-20 Kg/ton of primary alloyed molten steel, and the addition amount of the fluorite is 2-4 Kg/ton of primary alloyed molten steel.
Compared with the prior art, the preparation method of the bearing steel wide steel strip reduces O, S content in steel by long-time and large-slag-quantity smelting of a converter and an LF refining furnace, and further reduces harmful gases and elements by RH vacuum degassing. The primary smelting temperature is controlled in the converter smelting process, so that tapping with low P content is facilitated, the primary smelting time is longer than that of ordinary steel, and homogenization of alloy and removal of nonmetallic inclusion are facilitated. The bearing steel wide steel strip prepared by the method has high strength, good hardenability and wear resistance, low inclusion content and high uniformity. In addition, the converter smelting adopted in the invention has the advantages of high purity of molten steel, low heavy metal content and low production cost.
Drawings
FIG. 1 is a flow chart of a process for preparing a wide steel strip of high-strength bearing steel for an automobile in an embodiment of the invention;
FIG. 2 is a metallographic structure diagram of the hot rolled steel strip produced in example 1;
FIG. 3 is a metallographic structure diagram of the hot rolled steel strip produced in example 2;
FIG. 4 is a metallographic structure diagram of a hot rolled steel strip produced in example 3.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
It should be noted that, without conflict, features in the embodiments of the present invention may be combined with each other. The terms "comprising," "including," "containing," and "having" are intended to be non-limiting, as other steps and other ingredients not affecting the result may be added. The above terms encompass the terms "consisting of … …" and "consisting essentially of … …". Materials, equipment, reagents are commercially available unless otherwise specified.
In the present invention, kg/ton of the main material means an amount of a substance added per ton of the main material; kg/ton of primary molten steel means the addition amount of a certain substance relative to each ton of primary molten steel; kg/ton of primary alloyed molten steel means an amount of a substance added per ton of primary alloyed molten steel.
The embodiment of the invention provides a high-strength bearing steel wide steel belt for an automobile, which comprises the following components in percentage by weight: c:0.99-1.07%, si:0.20-0.35%, mn:0.25-0.45%, S:0-0.010%; p:0-0.020%, cr:1.50-1.70%, ni:0.1-0.50%, als:0.010-0.060%, cu:0-0.20%, as:0-0.0080%, O:0-0.0015%, N:0-0.0060%, impurity: 0-0.5%, and the balance being Fe.
Compared with the prior art, the invention improves the comprehensive performance of the steel strip by adding Cr, ni and other alloy elements into the components of the wide steel strip of the bearing steel; cr can form carbide with C so as to improve the hardenability and strength of steel, ni can strengthen ferrite and refine and increase pearlite, and the strength and fatigue resistance of steel are improved. Because the P element is easy to gather on the grain boundary and the surface of the steel strip, the grain boundary is embrittled, and the fatigue performance of the bearing is affected; o element is easy to form Al with Al 2 O 3 Inclusion to form CaSiO with Si and Ca 3 The silicate inclusions and Mg, si and other elements form oxide point-shaped inclusions, so that the fatigue life of the steel is influenced; s element easily forms sulfide in steel, so that the steel is hot and brittle; therefore, the invention adopts low P, low S and low O design in the components of the wide steel strip of the bearing steel, thereby ensuring that the wide steel strip of the bearing steel has higher fatigue resistance.
The design of the chemical components of the high-strength bearing steel wide steel belt for the automobile provided by the embodiment of the invention is as follows:
1) Determination of C content
The C in the bearing steel is the most important element for ensuring the hardenability and the wear resistance of the bearing steel, the content is generally about 1.0 percent, and the factor that the high-carbon steel is easy to decarbonize in the annealing process is considered. The content of C in the present invention was determined to be 0.99-1.07%.
2) Determination of Si content
Si is used as a strengthening element in steel, plays a role of a deoxidizer, can reduce the oxygen content in the steel, and can increase the heat sensitivity of the steel, reduce the toughness of the steel and influence the formability of the steel while improving the tempering resistance of the steel. In order to ensure a low oxygen content in the steel while reducing the detrimental effects of Si, the present invention determines the Si content to be in the range of 0.20-0.35%.
3) Determination of Mn content
Mn can improve the strength of steel, increase the hardenability of the steel, can be used as a deoxidizing element and is combined with S to form less harmful MnS, so Mn is the most common added element in the steel; however, too high an Mn content increases the temper brittleness of the steel, causes quench cracking, and is detrimental to the formation of the steel. The Mn content of the present invention was determined to be 0.25-0.45%.
4) Determination of Cr content
Cr is the cheapest element for improving the strength and toughness of steel, cr and C form carbide, and the carbide can be dissolved in the steel to obviously improve the strength of the steel, so that a product with good wear resistance and high hardness is obtained; however, the Cr content is too high, so that massive carbides are easily formed, and the toughness and fatigue property of the steel are reduced, thereby prolonging the service life of the bearing. The invention comprehensively considers the wear resistance, hardness, toughness and fatigue resistance of the bearing steel, and determines the Cr content to be 1.50-1.70%.
5) Determination of Ni content
Ni and Fe can be infinitely dissolved, an austenite region of iron is enlarged, the Fe-Fe alloy is a main alloy element for forming and stabilizing austenite, the diffusion rate of each element in steel can be reduced, and the hardenability is improved; strengthening ferrite, refining and increasing pearlite, improving the strength and fatigue resistance of steel, improving toughness and plasticity, and reducing the sensitivity of steel to notch. In the present invention, ni content is determined to be 0.10-0.50% in order to enhance strength and toughness of the bearing.
6) Determination of Cu content
The high Cu content in the steel leads to thermal embrittlement of the steel, and when the Cu content is more than 0.2%, fe is oxidized before Cu in the heating process, and Cu forms a layer of film on the surface of the steel, so that the steel is easy to crack. In the present invention, cu content is determined to be 0-0.20% in order to avoid copper embrittlement of the bearing steel.
7) Determination of O, N content
Oxygen forms inclusions with many elements such as metal oxides, silicates, aluminates and similar inclusion compounds, and in addition, oxygen can precipitate as FeO, mnO and other oxide inclusions upon cooling, thereby impairing machinability and adversely affecting the mechanical properties of the steel. Most of nitrogen in steel is in the form of metal nitride, and when the nitrogen content is too high, the steel can undergo strain aging after being stored for a certain time, and Fe 4 N is deposited on grain boundaries, the steel cannot be deep drawn, is easily torn, and cannot be uniformly stretched in all directions. In order to avoid the influence of O, N on the performance of the steel, the contents of O are determined as follows: 0-0.0015%, N:0-0.0060%.
As shown in fig. 1, the invention also provides a method for preparing the high-strength bearing steel wide steel strip for the automobile, which comprises the following steps:
s1, carrying out primary smelting of oxygen blowing on a main raw material and a slag former in a converter to obtain primary steelmaking water; wherein the primary refining temperature is 1580-1680 ℃, the time is 20-40min, and the adding amount of the slag former is 89-160 Kg/ton of main raw material;
s2, adding ferrosilicon, aluminum iron and a carburant into the primary steelmaking water, and blowing argon to perform primary alloying to obtain primary alloyed molten steel;
s3, adding ferrosilicon, manganese metal, ferrochrome and carburant into the primary alloyed molten steel, performing secondary alloying, and then adding lime and fluorite for refining to obtain refined molten steel, wherein the refining time is 80-120min;
s4, vacuum degassing is carried out on the refined molten steel, a silicon-calcium wire and an aluminum wire are fed, argon is blown, and degassed molten steel is obtained;
s5, moving the degassed molten steel into a tundish for continuous casting to obtain a continuous casting blank;
and S6, heating the continuous casting blank, and then carrying out hot rolling and coiling to obtain a hot rolled steel strip, wherein the width of the hot rolled steel strip is 1000-1300mm, and the thickness of the hot rolled steel strip is 2.5-14mm.
Compared with the prior art, the preparation method of the wide steel strip of the high-strength bearing steel for the automobile reduces O, S content in the steel by long-time and large-slag-quantity smelting in a converter and an LF refining furnace, and further reduces harmful gas and elements by RH vacuum degassing. The primary smelting temperature is controlled in the converter smelting process, so that tapping with low P content is facilitated, the primary smelting time is longer than that of ordinary steel, and homogenization of alloy and removal of nonmetallic inclusion are facilitated. The bearing steel wide steel strip prepared by the method has high strength, good hardenability and wear resistance, low inclusion content and high uniformity. In addition, the converter smelting adopted in the invention has the advantages of high purity of molten steel, low heavy metal content and low production cost.
In the embodiment of the present invention, in the step S1, the main raw materials include, by mass: molten iron: 85-90%, scrap steel: 10-15%, nickel plate: 0.15-0.45%; the slag former consists of active lime, limestone, magnesite, sinter and OG mud pressing blocks; the addition amounts of the components in the slag former are respectively as follows: 40-60 Kg/ton of active lime, 20-40 Kg/ton of limestone, 7-15 Kg/ton of magnesite, 7-15 Kg/ton of sinter, and 15-30 Kg/ton of OG mud briquette. The O, S content in the steel is reduced more favorably by the cooperation of different slag formers.
In the embodiment of the invention, in the step S2, the adding amount of the aluminum iron is 0.8-2.0 Kg/ton of primary molten steel, and the adding amount of the carburant is 11.5-13 Kg/ton of primary molten steel. In the step S3, the refining temperature is 1550-1620 ℃ and the refining time is 80-120min. In the embodiment of the invention, in the step S3, the addition amount of the ferrosilicon is 2.4-3.5 Kg/ton of primary alloyed molten steel, the addition amount of the manganese metal is 2.6-4.2 Kg/ton of primary alloyed molten steel, the addition amount of the ferrochrome is 27-30 Kg/ton of primary alloyed molten steel, the addition amount of the carburant is 0.5-1 Kg/ton of primary alloyed molten steel, the addition amount of the lime is 8-20 Kg/ton of primary alloyed molten steel, and the addition amount of the fluorite is 2-4 Kg/ton of primary alloyed molten steel. Alloy elements are introduced into the steel through primary alloying and secondary alloying so as to improve the comprehensive performance of the bearing steel strip.
In the embodiment of the invention, in the step S4, in the process of vacuum degassing the refined molten steel, the vacuum degree of the vacuum refining furnace is 100-300Pa, and the vacuum maintaining time is 15-25min. The vacuum degassing further reduces harmful gases and elements in the molten steel.
In the embodiment of the present invention, in the step S5, a two-cooling dynamic water distribution technology is adopted in the continuous casting process, and the blank drawing speed is 0.8-1.2m/min. The dynamic water distribution of the secondary cooling water is to carry out heat tracking on the continuous casting billet, and the secondary cooling water is regulated according to the tracking result. The invention ensures stable surface temperature of the continuous casting billet by the secondary cooling water dynamic water distribution technology, and simultaneously realizes low segregation continuous casting by matching with lower billet drawing speed, and avoids corner cracking and edge cracking of the continuous casting billet.
In the embodiment of the present invention, in the step S6, the temperatures of the start section 20m and the end section 20m of the hot rolled steel strip during the coiling are 20 ℃ higher than the temperature of the intermediate section. By increasing the temperature of the head section and the tail section of the hot rolled steel strip by 20 ℃ in the coiling process, the steel strip is heated more uniformly in the coiling process, so that the uniformity of the wide steel strip of the bearing steel is improved.
In the embodiment of the present invention, in the step S6, the initial rolling temperature of the hot rolling is 1220-250 ℃, and the coiling temperature is 620-700 ℃.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
In examples 1 to 3 of the present invention, ferrosilicon is FeMn68Si18, and the composition thereof contains 68% manganese, 18% silicon, less than 5% impurities, and the balance iron; the aluminum iron is FeAl40, and the aluminum iron comprises 40% of aluminum, less than 5% of other impurities and the balance of iron; the carburant contains 92% of carbon and less than 5% of other impurities; the ferrosilicon is FeSi75, the components of the ferrosilicon comprise 75% of silicon, less than 5% of other impurities and the balance of iron; the manganese metal contains 95% of manganese, less than 2% of other impurities and the balance of iron; the ferrochrome is FeCr55C0.50, the components of the ferrochrome comprise 55 percent of chromium, less than 5 percent of other impurities and the balance of iron; the used silicon-calcium wire is Si50Ca28, and the components comprise 50% of silicon, 28% of calcium, less than 5% of other impurities and the balance of iron; the aluminum wire used contained 99.5% aluminum.
Example 1
1.1 Primary smelting in converter
Adding a main raw material consisting of 189.57 tons of molten iron, 23.02 tons of scrap steel and 0.41 ton of nickel plates into a converter, and then adding 52 Kg/ton of active lime, 32 Kg/ton of limestone, 10.5 Kg/ton of magnesite, 12 Kg/ton of sinter and 23 Kg/ton of OG mud pressing block; and (3) primary smelting for 31min at the temperature of 1650 ℃, and placing steel after primary smelting, wherein the steel placing temperature is 1625 ℃, so as to obtain primary smelting molten steel, and the S content in the molten steel is 0.003%.
1.2 preliminary alloying
Adding ferrosilicon into the obtained primary steelmaking water, wherein the adding amount is 2 Kg/ton of primary steelmaking water; adding aluminum iron with the addition amount of 1.28 Kg/ton of primary molten steel; adding carburant, wherein the adding amount is 12 Kg/ton of primary molten steel; then argon is blown for preliminary alloying, and primary alloyed molten steel is obtained; wherein the argon blowing time is 7min.
1.3 LF refining
Transferring the obtained primary alloyed molten steel into an LF refining furnace, and adding ferrosilicon with the addition amount of 3.2 Kg/ton of primary alloyed molten steel; adding metal manganese with the addition amount of 3.4 Kg/ton of primary alloyed molten steel; adding ferrochrome with the addition amount of 28 Kg/ton of primary alloyed molten steel; adding carburant with the addition amount of 0.64 Kg/ton of primary molten steel; and (3) performing secondary alloying, and then adding 14 Kg/ton of activated lime primary alloyed molten steel and 3.2 Kg/ton of fluorite primary alloyed molten steel for LF refining to obtain refined molten steel, wherein the LF refining time is 105min, and the LF refining temperature is 1570 ℃.
1.4 RH vacuum degassing
Vacuum degassing the refined molten steel, and feeding a calcium silicate wire into the obtained refined molten steel, wherein the feeding amount is 1.4 Kg/ton of refined molten steel; feeding aluminum wires, feeding 0.8 Kg/ton refined molten steel, and blowing argon for 8min to obtain degassed molten steel, wherein the vacuum degree of a vacuum refining furnace is 100-300Pa and the vacuum holding time is 20min in the process of vacuum degassing the refined molten steel.
1.5 continuous casting
Transferring the obtained deaerated molten steel into a tundish, pouring at the temperature of 1492 ℃ and drawing the billet at the speed of 1.1m/min to obtain a continuous casting blank; the thickness of the continuous casting blank is 230mm, the width is 1150mm, and the secondary cooling water distribution technology is adopted in the continuous casting process.
1.6 Hot Rolling and coiling
And (3) carrying out high-temperature rolling on the obtained casting blank at the initial rolling temperature of 1240 ℃, coiling to obtain a hot-rolled steel strip, wherein the coiling temperature is 680 ℃, the thickness of the hot-rolled steel strip is 4.5mm, the width of the hot-rolled steel strip is 1140mm, and the temperature of a starting section 20m and an ending section 20m of the hot-rolled steel strip in the coiling process is 20 ℃ higher than that of the middle section.
Example 2
2.1 Primary smelting in converter
Adding a main raw material consisting of 188.61 tons of molten iron, 22.85 tons of scrap steel and 0.54 ton of nickel plates into a converter, and then adding 53 Kg/ton of active lime, 34 Kg/ton of limestone, 11.5 Kg/ton of magnesite, 13 Kg/ton of sinter and 25 Kg/ton of OG mud pressing block; and (3) primary smelting for 31min at the temperature of 1640 ℃, and placing steel after primary smelting, wherein the steel placing temperature is 1627 ℃, so as to obtain primary smelting molten steel, and the S content in the molten iron is 0.003%.
2.2 preliminary alloying
Adding ferrosilicon into the obtained primary steelmaking water, wherein the adding amount is 2 Kg/ton of primary steelmaking water; adding aluminum iron with the addition amount of 1.41 Kg/ton of primary molten steel; adding carburant with the addition amount of 12.2 Kg/ton of primary molten steel; then argon is blown for preliminary alloying, and primary alloyed molten steel is obtained; wherein the argon blowing time is 7min.
2.3 LF refining
Transferring the obtained primary alloyed molten steel into an LF refining furnace, and adding ferrosilicon with the addition amount of 2.9 Kg/ton of primary alloyed molten steel; adding metal manganese with the addition amount of 3.1 Kg/ton of primary alloyed molten steel; adding ferrochrome with the addition amount of 29.5 Kg/ton of primary alloyed molten steel; adding carburant with the addition amount of 0.64 Kg/ton of primary molten steel; and (3) performing secondary alloying, and then adding 15Kg of active lime/ton of primary alloyed molten steel and 3.4Kg of fluorite/ton of primary alloyed molten steel for LF refining to obtain refined molten steel, wherein the LF refining time is 108min, and the LF refining temperature is 1560 ℃.
2.4 RH vacuum degassing
Vacuum degassing the refined molten steel, and feeding a calcium silicate wire into the obtained refined molten steel, wherein the feeding amount is 1.5 Kg/ton of refined molten steel; feeding aluminum wires, feeding 0.75 Kg/ton refined molten steel, and blowing argon for 8min to obtain degassed molten steel, wherein the vacuum degree of a vacuum refining furnace is 100-300Pa and the vacuum holding time is 20min in the process of vacuum degassing the refined molten steel.
2.5 continuous casting
Transferring the obtained deaerated molten steel into a tundish, pouring at the temperature of 1491 ℃ and drawing the billet at the speed of 1.1m/min to obtain a continuous casting blank; the thickness of the continuous casting blank is 230mm, the width is 1280mm, and the secondary cooling water distribution technology is adopted in the continuous casting process.
2.6 Hot Rolling and coiling
And rolling the obtained casting blank at a high temperature of 1242 ℃ at the initial rolling temperature, coiling to obtain a hot rolled steel strip, wherein the coiling temperature is 680 ℃, the thickness of the hot rolled steel strip is 3.5mm, the width of the hot rolled steel strip is 1250mm, and the temperature of a starting section 20m and an ending section 20m of the hot rolled steel strip in the coiling process is 20 ℃ higher than that of the middle section.
Example 3
3.1, primary refining in a converter
Adding a main raw material consisting of 186.94 tons of molten iron, 22.32 tons of scrap steel and 0.738 ton of nickel plates into a converter, and then adding 50 Kg/ton of active lime, 33 Kg/ton of limestone, 11.5 Kg/ton of magnesite, 14 Kg/ton of sinter and 22 Kg/ton of OG mud pressing block; and (3) primary smelting for 31min at 1630 ℃, and placing steel after primary smelting, wherein the steel placing temperature is 1621 ℃, so as to obtain primary smelting molten steel, and the S content in the molten steel is 0.003%.
3.2 preliminary alloying
Adding ferrosilicon into the obtained primary steelmaking water, wherein the adding amount is 2 Kg/ton of primary steelmaking water; adding aluminum iron with the addition amount of 1.36 Kg/ton of primary molten steel; adding carburant with the addition amount of 12.3 Kg/ton of primary molten steel; then argon is blown for preliminary alloying, and primary alloyed molten steel is obtained; wherein the argon blowing time is 8min.
3.3 LF refining
Transferring the obtained primary alloyed molten steel into an LF refining furnace, and adding ferrosilicon with the addition amount of 3.0 Kg/ton of primary alloyed molten steel; adding metal manganese with the addition amount of 3.6 Kg/ton of primary alloyed molten steel; adding ferrochrome with the addition amount of 28.4 Kg/ton of primary alloyed molten steel; adding carburant with the addition amount of 0.62 Kg/ton of primary molten steel; and (3) performing secondary alloying, and then adding 15 Kg/ton of active lime and 3.1 Kg/ton of fluorite of primary alloyed molten steel for LF refining to obtain refined molten steel, wherein the LF refining time is 106min, and the LF refining temperature is 1600 ℃.
3.4 RH vacuum degassing
Vacuum degassing the refined molten steel, and feeding a calcium silicate wire into the obtained refined molten steel, wherein the feeding amount is 1.6 Kg/ton of refined molten steel; feeding aluminum wires, wherein the feeding amount is 0.82 Kg/ton of refined molten steel, and blowing argon for 8min to obtain degassed molten steel, wherein the vacuum degree of a vacuum refining furnace is 100-300Pa and the vacuum holding time is 20min in the process of vacuum degassing the refined molten steel.
3.5 continuous casting
Transferring the obtained deaerated molten steel into a tundish, pouring at the temperature of 1495 ℃ and drawing the billet at the speed of 1.1m/min to obtain a continuous casting blank; the thickness of the continuous casting blank is 230mm, the width is 1280mm, and the secondary cooling water distribution technology is adopted in the continuous casting process.
3.6 Hot Rolling and coiling
And (3) carrying out high-temperature rolling on the obtained casting blank at the initial rolling temperature of 1240 ℃, coiling to obtain a hot-rolled steel strip, wherein the coiling temperature is 680 ℃, the thickness of the hot-rolled steel strip is 4.0mm, the width of the hot-rolled steel strip is 1250mm, and the temperature of a starting section 20m and an ending section 20m of the hot-rolled steel strip in the coiling process is 20 ℃ higher than that of the middle section.
Experimental example
The components of the hot rolled steel strips produced in examples 1 to 3 were measured, and the measurement results are shown in Table 1. As can be seen from tables 1 and 2, the chemical components of the hot rolled steel strips produced in examples 1, 2 and 3 were controlled stably.
TABLE 1
| Sample of | C（%） | Si（%） | Mn（%） | S（%） | P（%） | Cr（%） | Ni（%） | Cu（%） | Fe（%） |
| Example 1 | 1.02 | 0.26 | 0.31 | 0.002 | 0.008 | 1.54 | 0.18 | 0.012 | 96.67 |
| Example 2 | 1.04 | 0.24 | 0.28 | 0.003 | 0.009 | 1.56 | 0.25 | 0.013 | 96.60 |
| Example 3 | 1.05 | 0.25 | 0.34 | 0.002 | 0.010 | 1.55 | 0.34 | 0.015 | 96.44 |
As can be seen from Table 2, the hot rolled steel strips prepared in examples 1 to 3 have higher tensile strength and higher elongation after break, and compared with the existing narrow strip steel (tensile strength 1098 MPa), the hot rolled steel strips prepared in examples 1 to 3 have tensile strength higher than 100MPa and strip width higher than 1000mm, the production efficiency is improved, the metallographic structure of the hot rolled steel strips prepared in examples 1 to 3 is characterized, and as can be seen from FIGS. 2 to 4, the metallographic structure of the hot rolled steel strips prepared in examples 1 to 3 is composed of uniform and fine pearlite and ferrite, and the uniform and fine structure is favorable for improving the comprehensive performance of the steel.
TABLE 2
In addition, although the present invention is disclosed above, the scope of the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications will fall within the scope of the invention.
Claims (1)
1. The preparation method of the high-strength bearing steel wide steel belt for the automobile is characterized by comprising the following components in percentage by weight: c:0.99-1.07%, si:0.20-0.35%, mn:0.25-0.45%, S:0-0.010%; p:0-0.020%, cr:1.50-1.70%, ni:0.10-0.50%, als:0.010-0.060%, cu:0-0.20%, as:0-0.0080%, O:0-0.0015%, N:0-0.0060%, impurity: 0-0.5%, and the balance being Fe;
the preparation method of the high-strength bearing steel wide steel belt for the automobile comprises the following steps:
s1, carrying out primary smelting of oxygen blowing on a main raw material and a slag former in a converter to obtain primary steelmaking water; wherein the primary refining temperature is 1580-1680 ℃, the time is 20-40min, and the adding amount of the slag former is 89-160 Kg/ton of main raw material;
s2, adding ferrosilicon, aluminum iron and a carburant into the primary steelmaking water, and blowing argon to perform primary alloying to obtain primary alloyed molten steel;
s3, adding ferrosilicon, manganese metal, ferrochrome and carburant into the primary alloyed molten steel, performing secondary alloying, and then adding lime and fluorite for refining to obtain refined molten steel, wherein the refining time is 80-120min;
s4, vacuum degassing is carried out on the refined molten steel, a silicon-calcium wire and an aluminum wire are fed, argon is blown, and degassed molten steel is obtained;
s5, moving the degassed molten steel into a tundish for continuous casting to obtain a continuous casting blank; wherein, a two-cooling dynamic water distribution technology is adopted in the continuous casting process, and the blank pulling speed is 0.8-1.2m/min;
s6, heating the continuous casting blank, and then carrying out hot rolling and coiling to obtain a hot rolled steel strip, wherein the width of the hot rolled steel strip is 1000-1300mm, and the thickness of the hot rolled steel strip is 2.5-14mm;
in the step S6, the temperatures of the start section 20m and the end section 20m of the hot rolled steel strip during the coiling process are 20 ℃ higher than the temperature of the middle section;
in the step S6, the initial rolling temperature of the hot rolling is 1220-250 ℃, and the coiling temperature is 620-700 ℃;
in the step S3, the refining temperature is 1550-1620 ℃;
in the step S4, in the process of vacuum degassing the refined molten steel, the vacuum degree of a vacuum refining furnace is 100-300Pa, and the vacuum maintaining time is 15-25min;
in the step S1, the main raw materials comprise the following components in percentage by mass: molten iron: 85-90%, scrap steel: 10-15%, nickel plate: 0.15-0.45%, wherein the S content in the molten iron is 0-0.008%; the slag former consists of active lime, limestone, magnesite, sinter and OG mud pressing blocks; the addition amounts of the components in the slag former are respectively as follows: 40-60 Kg/ton of active lime, 20-40 Kg/ton of limestone, 7-15 Kg/ton of magnesite, 7-15 Kg/ton of sinter, 15-30 Kg/ton of OG mud briquette;
in the step S2, the addition amount of the aluminum iron is 0.8-2.0 Kg/ton of primary molten steel, and the addition amount of the carburant is 11.5-13 Kg/ton of primary molten steel;
in the step S3, the addition amount of the ferrosilicon is 2.4-3.5 Kg/ton of primary alloyed molten steel, the addition amount of the manganese metal is 2.6-4.2 Kg/ton of primary alloyed molten steel, the addition amount of the ferrochrome is 27-30 Kg/ton of primary alloyed molten steel, the addition amount of the carburant is 0.5-1 Kg/ton of primary alloyed molten steel, the addition amount of the lime is 8-20 Kg/ton of primary alloyed molten steel, and the addition amount of the fluorite is 2-4 Kg/ton of primary alloyed molten steel.
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| CN108676952A (en) * | 2018-03-26 | 2018-10-19 | 敬业钢铁有限公司 | A kind of preparation method of converter process production bearing steel |
| CN115449704A (en) * | 2022-07-29 | 2022-12-09 | 江阴兴澄特种钢铁有限公司 | Steel for new energy automobile hub bearing and production method thereof |
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| CN108676952A (en) * | 2018-03-26 | 2018-10-19 | 敬业钢铁有限公司 | A kind of preparation method of converter process production bearing steel |
| CN115449704A (en) * | 2022-07-29 | 2022-12-09 | 江阴兴澄特种钢铁有限公司 | Steel for new energy automobile hub bearing and production method thereof |
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