CN116287955A - Production process of low-phosphorus low-sulfur low-cost master electrode - Google Patents
Production process of low-phosphorus low-sulfur low-cost master electrode Download PDFInfo
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- CN116287955A CN116287955A CN202310333974.0A CN202310333974A CN116287955A CN 116287955 A CN116287955 A CN 116287955A CN 202310333974 A CN202310333974 A CN 202310333974A CN 116287955 A CN116287955 A CN 116287955A
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- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 52
- 239000011593 sulfur Substances 0.000 title claims abstract description 47
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 45
- 239000011574 phosphorus Substances 0.000 title claims abstract description 42
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 114
- 239000010959 steel Substances 0.000 claims abstract description 114
- 239000002994 raw material Substances 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 35
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 22
- -1 silicon-magnesium rare earth Chemical class 0.000 claims abstract description 20
- 238000005266 casting Methods 0.000 claims abstract description 16
- 238000007670 refining Methods 0.000 claims abstract description 13
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 12
- 230000023556 desulfurization Effects 0.000 claims abstract description 12
- 238000002844 melting Methods 0.000 claims abstract description 11
- 230000008018 melting Effects 0.000 claims abstract description 11
- 238000007872 degassing Methods 0.000 claims abstract description 7
- 239000011777 magnesium Substances 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 34
- 229910052786 argon Inorganic materials 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 12
- 238000004512 die casting Methods 0.000 claims description 12
- 239000010436 fluorite Substances 0.000 claims description 12
- 229910052782 aluminium Inorganic materials 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000035515 penetration Effects 0.000 claims description 4
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000009489 vacuum treatment Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 15
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 239000000956 alloy Substances 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000011651 chromium Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000010309 melting process Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 238000013442 quality metrics Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
-
- 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
- C21C7/0006—Adding metallic additives
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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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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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
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
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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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
- C22B9/18—Electroslag remelting
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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
- C21C2007/0093—Duplex process; Two stage processes
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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Abstract
The invention relates to a production process of a low-phosphorus low-sulfur low-cost mother electrode. The invention relates to a production process of a low-phosphorus low-sulfur low-cost master electrode, which comprises the following steps: (1) raw materials are prepared: the raw materials comprise 30-100 wt% of waste H13 die steel (2) intermediate frequency furnace melting raw materials: adding silicon-magnesium rare earth for desulfurization, wherein the silicon-magnesium rare earth comprises the following components: 43-49% of Si, 5.5-6.8% of Mg and 0.4-1.8% of Re; (3) slag refining in an LF furnace: adding slag to carry out slag formation, wherein the slag comprises the following components in percentage by weight: 48-55wt% of CaO and 18-25wt% of FeO; (4) degassing by a VD furnace; (5) mother electrode casting mold. The production process of the low-phosphorus low-sulfur low-cost master electrode adopts waste H13 die steel as a production raw material, has low cost, and controls the indexes of the harmful components P, S in the obtained master electrode to: p is less than or equal to 0.010wt% and S is less than or equal to 0.002wt%.
Description
Technical Field
The invention relates to the technical field of molten steel smelting, in particular to a production process of a low-phosphorus low-sulfur low-cost master electrode.
Background
With the increase of the production amount of H13 die steel, a large amount of waste H13 die steel is produced in society. How to recycle the used H13 die steel is a main research direction at present. Another research direction is how to use waste H13 die steel to produce high quality H13 die steel with low phosphorus, low sulfur and low cost on this basis.
One of the quality metrics for steel is the content of phosphorus and sulfur. Too high a content of phosphorus and sulfur has an adverse effect on the steel. When the phosphorus content in the H13 die steel is higher, the plasticity and toughness of the die steel are reduced, especially the brittleness transition temperature of the steel is increased, and the cold brittleness of the steel is improved; when the H13 die steel contains high sulfur, the workpiece is cracked along the grain boundary when being heated to 1000-1200 ℃ for forging and rolling, and the phenomenon is called hot shortness. In addition, the presence of higher levels of sulfur in H13 die steel also reduces the weldability of the steel, and the weld is prone to a crack and air holes.
At present, waste H13 die steel can be recycled to produce a master electrode, and the master electrode is a prefabricated steel blank for electroslag remelting furnace production and also needs to meet the requirements of low phosphorus and low sulfur. The recycled waste H13 die steel cannot guarantee the phosphorus and sulfur contents, and if the production of the low-phosphorus low-sulfur master electrode by remelting and casting the waste H13 die steel cannot be realized, the production process must be increased. At present, two main modes for producing a mother electrode by recycling waste H13 die steel are as follows: (1) smelting and casting in an arc furnace; (2) and smelting and casting in a common intermediate frequency furnace. Both of these processes have their own drawbacks. In the first mode, the arc furnace is used for smelting alloy with severe burning loss, namely one fifth of the total burning loss of chromium and one fifth of the burning loss of molybdenum, and alloy needs to be additionally supplemented to meet the component requirements, so that great resource waste is easily caused by arc furnace smelting. In the second mode, the common intermediate frequency furnace smelting (only molten steel) can not remove P, S and other harmful elements, and can not meet the production requirements of the low-phosphorus and low-sulfur master electrode.
Disclosure of Invention
Based on the above, the invention aims to provide a production process of a low-phosphorus low-sulfur low-cost master electrode, which adopts waste H13 die steel as a production raw material, has low cost, and controls indexes of harmful components P, S in the obtained master electrode to: p is less than or equal to 0.010wt% and S is less than or equal to 0.002wt%.
A production process of a low-phosphorus low-sulfur low-cost master electrode comprises the following steps:
(1) Preparing raw materials: the raw materials comprise 30-100 wt% of waste H13 die steel, and the balance of pure high-quality steel;
(2) Melting raw materials in an intermediate frequency furnace: smelting the raw materials prepared in the step (1) by using an intermediate frequency furnace, and adding silicon-magnesium rare earth for desulfurization, wherein the silicon-magnesium rare earth comprises the following components: 43-49% of Si, 5.5-6.8% of Mg and 0.4-1.8% of Re;
(3) Slag making and refining in an LF furnace: pouring the molten steel desulfurized in the step (2) into an LF furnace, and adding slag for slagging, wherein the slag comprises the following components in percentage by weight: 48-55% of CaO and 18-25% of FeO; after slag penetration, the flow of argon at the bottom is increased, molten steel is stirred, fluorite is added to a slag layer, dephosphorization is carried out, and lime is added for covering after dephosphorization is completed;
(4) Degassing by a VD furnace: the molten steel treated in the step (3) is transferred to a VD furnace for vacuum treatment after being discharged from the LF; breaking the blank after maintaining the pressure for 12-18 minutes; feeding aluminum wires for deoxidization after breaking the air;
(5) Mother electrode casting mold: preheating a master electrode die casting ingot mould, filling the master electrode die casting ingot mould with argon, casting the molten steel treated in the step (4) to the master electrode die casting ingot mould under the protection of argon, cooling, solidifying and demoulding to obtain the low-phosphorus low-sulfur low-cost master electrode.
According to the invention, waste H13 die steel is used as a raw material, a process of double-combined use of an intermediate frequency furnace and an LF furnace is adopted to smelt molten steel smelted by the waste H13 die steel, and dephosphorization, sulfur removal and degassing are achieved through microalloying and argon protection casting to produce the low-phosphorus low-sulfur low-cost H13 die steel master electrode. The production process adopts silicon-magnesium rare earth, and the silicon-magnesium rare earth comprises the following components: 43-49wt% of Si, 5.5-6.8wt% of Mg and 0.4-1.8wt% of Re; the molten steel is microalloyed, the silicon-magnesium rare earth plays roles of refining, sulfur removal, neutralization and low-melting-point harmful impurities, the molten steel is further purified, and the desulfurization rate of the molten steel can reach 50-90%. The ladle refining furnace of the LF furnace has refining functions of maintaining the reducing atmosphere in the furnace, stirring argon, heating by electrode submerged arc, refining synthetic slag and the like, wherein the refining function of the synthetic slag can better complete dephosphorization tasks, achieve the effect of further improving the quality of molten steel, and add lime for covering after dephosphorization is completed. The slag comprises the following components in percentage by weight: 48-55wt% of CaO and 18-25wt% of FeO, refining dephosphorization is carried out on the desulfurized molten steel by adopting an LF furnace, the dephosphorization rate of the molten steel can exceed 30-70%, and the produced low-phosphorus low-sulfur low-cost master electrode can reach the level that the sulfur content is less than or equal to 0.002wt% and the phosphorus content is less than or equal to 0.01wt% under the conditions of ensuring that the phosphorus content in the furnace is less than or equal to 0.025wt% and the treatment is sufficient. The production process adopts argon protection pouring. Argon is filled into the metal casting mould before casting, and the casting is protected by the argon in the casting process. Avoiding the molten steel from being exposed and causing molten steel suction. The production process can better recycle the waste H13 die steel, and the alloy yield (the utilization rate of the original alloy in the waste H13 die steel) can exceed 95 percent, and the production process can achieve the purposes of high-efficiency dephosphorization, sulfur removal and degassing to achieve the purity of molten steel.
Further, in the raw material of the step (1), the proportion of the waste H13 die steel is 70-90wt% and the balance is pure high-quality steel. Ensures that the content of molten steel components can be adjusted.
Further, in the step (2), when the prepared raw materials are smelted in the intermediate frequency furnace, the smelting temperature is 1480-1540 ℃, the smelting time is controlled to be within 2 hours, and the tapping temperature is 1595-1615 ℃.
Further, in the step (2), the addition amount of the silicon-magnesium rare earth is 2wt% of the total weight of the raw materials. The addition amount of the silicon-magnesium rare earth is 2wt percent, and the desulfurization rate of molten steel can reach 50-90%.
Further, in the step (2), in the process of melting raw materials in the intermediate frequency furnace, carbonized chaff or slag remover can be used for covering the surface of molten steel, so that the molten steel is not exposed in the melting process.
Further, in the step (3), the addition amount of the slag is 3-5wt% of the molten steel amount. If the adding amount of the slag is too low, the dephosphorization effect is poor; if the addition amount of the slag is too high, the quality of molten steel is affected.
Further, in the step (3), the fluorite is added in an amount of 2 to 3wt% based on the amount of the molten steel. If the addition amount of the fluorite is too low, the fluidity of molten steel is poor; if the addition amount of fluorite is too high, the quality of molten steel is affected. The addition amount of the fluorite is selected to be 2-3wt% of the molten steel, so that the fluidity can be ensured, meanwhile, the fluorite can further remove the sulfur in the molten steel, and the sulfur content in the molten steel is reduced.
Further, in the step (4), the vacuum degree is drawn to 67Pa or lower.
Further, in the step (4), when the aluminum wire is fed for deoxidization, the aluminum wire is fed in an amount of 1.8 to 2.5 m/ton per ton of molten steel.
Compared with the prior art, the invention takes the waste H13 die steel as the production raw material, and the desulfurization rate of molten steel can reach 50-90% in an intermediate frequency furnace; further in the LF furnace, the dephosphorization rate of molten steel can exceed 30-70%, and the produced low-phosphorus low-sulfur low-cost master electrode can reach the level that the sulfur content is less than or equal to 0.002wt% and the phosphorus content is less than or equal to 0.01wt%.
Further, in the step (1), the clean high-quality steel may be the head and tail of clean steel in steelworks (low-phosphorus-sulfur high-quality scrap steel).
Detailed Description
The national standard range of alloy elements in the H13 die steel parent electrode product is shown in the following table:
in the raw materials to be prepared, in order to make the alloy composition of the master electrode meet the standard, it is generally necessary to prepare the raw materials so that the alloy elements in the raw material content are aligned within the standard range; this technical means is also a conventional technical means in the art, and will not be described herein.
Example 1
The embodiment provides a production process of a low-phosphorus low-sulfur low-cost mother electrode, which comprises the following steps:
(1) Preparing raw materials: the raw materials comprise 70wt% of waste H13 die steel and 30wt% of clean high-quality scrap steel; and adjusting the alloy composition to be within the standard range;
in this embodiment, the contents of the components in the waste H13 die steel and the clean high-quality scrap steel are shown in table 1:
TABLE 1
(2) Melting raw materials in an intermediate frequency furnace: smelting the raw materials prepared in the step (1) by using an intermediate frequency furnace, controlling the temperature to 1480-1540 ℃, and adding silicon-magnesium rare earth for desulfurization, wherein the addition amount of the silicon-magnesium rare earth is 2wt% of the raw materials, and the silicon-magnesium rare earth comprises the following components: 43wt% of Si; 6.8wt% of Mg; 0.4wt% of Re and the balance of Fe; in the process of melting raw materials in an intermediate frequency furnace, the smelting time is 1.5 hours, and the surface of molten steel is covered by carbonized chaff, so that the molten steel is not exposed in the melting process, and the tapping temperature is 1595-1615 ℃;
in this embodiment, the raw materials are melted in an intermediate frequency furnace, and the content of the components after adding the silicon-magnesium-rare earth is shown in table 2:
TABLE 2
Composition of the components | C | Si | Mn | P | S | Cr | Mo | V | |
Melting and cleaning device | Content (wt%) | 0.38 | 1.04 | 0.34 | 0.026 | 0.015 | 4.80 | 1.25 | 0.91 |
Adding silicon-magnesium rare earth | Content (wt%) | 0.38 | 1.13 | 0.34 | 0.026 | 0.003 | 4.79 | 1.26 | 0.91 |
(3) Slag making and refining in an LF furnace: pouring the molten steel desulfurized in the step (2) into an LF furnace, adding slag for slagging, wherein the adding amount of the slag is 3wt% of the molten steel, and the slag comprises the following components in percentage by weight: 48wt% of CaO, 25wt% of FeO and the balance of impurities; after slag penetration, the flow of argon at the bottom is increased, molten steel is stirred, fluorite is added into a slag layer, dephosphorization is carried out, and the addition amount of the fluorite is 3wt% of the molten steel; lime is added to cover after dephosphorization is completed to prevent molten steel from being exposed;
the composition content of the molten steel at the LF-outlet is shown in table 3:
TABLE 3 Table 3
(4) Degassing by a VD furnace: the molten steel treated in the step (3) is transferred to a VD furnace for vacuum treatment after being discharged from the LF; pumping the vacuum degree to below 67Pa, maintaining the pressure for 12 minutes, and breaking the air; feeding aluminum wires for deoxidization according to the proportion of 1.8-2.5 meters per ton of molten steel after the air break;
(5) Mother electrode casting mold: and (3) preheating a master electrode die casting ingot mould, filling the master electrode die casting ingot mould with argon, casting the molten steel treated in the step (4) to the master electrode die casting ingot mould under the protection of argon, cooling, solidifying and demoulding to obtain the low-phosphorus low-sulfur low-cost master electrode.
The composition content of the low-phosphorus low-sulfur low-cost parent electrode in this example is shown in table 4:
TABLE 4 Table 4
Example 2
The embodiment provides a production process of a low-phosphorus low-sulfur low-cost mother electrode, which comprises the following steps:
(1) Preparing raw materials: the raw materials comprise 90wt% of waste H13 die steel and 10wt% of pure high-quality scrap steel; and adjusting the alloy composition to be within the standard range;
in this example, the contents of the components in the waste H13 die steel and the clean high-quality scrap steel are shown in table 5:
TABLE 5
(2) Melting raw materials in an intermediate frequency furnace: smelting the raw materials prepared in the step (1) by using an intermediate frequency furnace, controlling the temperature to 1480-1540 ℃, and adding silicon-magnesium rare earth for desulfurization, wherein the addition amount of the silicon-magnesium rare earth is 2wt% of the raw materials, and the silicon-magnesium rare earth comprises the following components: 49wt% of Si; 5.5wt% of Mg; re 1.8wt% and Fe as the rest; in the process of melting raw materials in an intermediate frequency furnace, the smelting time is 1.5 hours, and the surface of molten steel is covered by carbonized chaff, so that the molten steel is not exposed in the melting process, and the tapping temperature is 1595-1615 ℃;
in this example, the raw materials are melted in an intermediate frequency furnace, and the content of the components after adding the silicon-magnesium-rare earth is shown in table 6:
TABLE 6
Composition of the components | C | Si | Mn | P | S | Cr | Mo | V | |
Melting and cleaning device | Content (wt%) | 0.37 | 0.98 | 0.36 | 0.017 | 0.014 | 4.95 | 1.24 | 0.92 |
Adding silicon-magnesium rare earth | Content (wt%) | 0.37 | 1.06 | 0.35 | 0.016 | 0.0016 | 4.85 | 1.22 | 0.89 |
(3) Slag making and refining in an LF furnace: pouring the molten steel subjected to desulfurization in the step (2) into an LF ladle, refining and dephosphorizing the molten steel subjected to desulfurization by adopting an LF furnace, refining and dephosphorizing the molten steel subjected to desulfurization by adopting the LF furnace, adding slag for slagging, wherein the adding amount of the slag is 5wt% of the molten steel, and the slag comprises the following components in percentage by weight: 55wt% of CaO, 18wt% of FeO and the balance of impurities; after slag penetration, the flow of argon at the bottom is increased, molten steel is stirred, fluorite is added into a slag layer, dephosphorization is carried out, and the addition amount of the fluorite is 2wt% of the molten steel; lime is added to cover after dephosphorization is completed to prevent molten steel from being exposed;
the composition content of the molten steel after LF-off is shown in table 7:
TABLE 7
(4) Degassing by a VD furnace: the molten steel treated in the step (3) is transferred to a VD furnace for vacuum treatment after being discharged from the LF; pumping the vacuum degree to below 67Pa, maintaining the pressure for 16 minutes, and breaking the air; feeding aluminum wires for deoxidization according to the proportion of 1.8-2.5 meters per ton of molten steel after the air break;
(5) Mother electrode casting mold: preheating a master electrode die casting ingot mould, filling the master electrode die casting ingot mould with argon, casting the molten steel obtained in the step (3) to the master electrode die casting ingot mould under the protection of argon, cooling, solidifying and demoulding to obtain the low-phosphorus low-sulfur low-cost master electrode.
The composition content of the low-phosphorus low-sulfur low-cost parent electrode in this embodiment is shown in table 8:
TABLE 8
Composition of the components | C | Si | Mn | P | S | Cr | Mo | V | |
Mother electrode | Content of | 0.39 | 1.06 | 0.36 | 0.006 | 0.0015 | 4.85 | 1.22 | 0.89 |
Compared with the prior art, the production process of the low-phosphorus low-sulfur low-cost master electrode takes waste H13 die steel as a production raw material, and the desulfurization rate of molten steel can reach 50-90% in an intermediate frequency furnace; in an LF furnace, the dephosphorization rate of molten steel can exceed 30-70%, and the sulfur content of the mother electrode produced by the production process of the low-phosphorus low-sulfur low-cost mother electrode is less than or equal to 0.002wt% and the phosphorus content is less than or equal to 0.01wt%.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention, and the invention is intended to encompass such modifications and improvements.
Claims (9)
1. A production process of a low-phosphorus low-sulfur low-cost master electrode is characterized by comprising the following steps of: the method comprises the following steps:
(1) Preparing raw materials: the raw materials comprise 30-100 wt% of waste H13 die steel, and the balance of pure high-quality steel;
(2) Melting raw materials in an intermediate frequency furnace: smelting the raw materials prepared in the step (1) by using an intermediate frequency furnace, and adding silicon-magnesium rare earth for desulfurization, wherein the silicon-magnesium rare earth comprises the following components: 43-49wt% of Si, 5.5-6.8wt% of Mg and 0.4-1.8wt% of Re;
(3) Slag making and refining in an LF furnace: pouring the molten steel desulfurized in the step (2) into an LF furnace, and adding slag for slagging, wherein the slag comprises the following components in percentage by weight: 48-55wt% of CaO and 18-25wt% of FeO; after slag penetration, the flow of argon at the bottom is increased, molten steel is stirred, fluorite is added to a slag layer, dephosphorization is carried out, and lime is added for covering after dephosphorization is completed;
(4) Degassing by a VD furnace: the molten steel treated in the step (3) is transferred to a VD furnace for vacuum treatment after being discharged from the LF; breaking the blank after maintaining the pressure for 12-18 minutes; feeding aluminum wires for deoxidization after breaking the air;
(5) Mother electrode casting mold: preheating a master electrode die casting ingot mould, filling the master electrode die casting ingot mould with argon, casting the molten steel treated in the step (4) to the master electrode die casting ingot mould under the protection of argon, cooling, solidifying and demoulding to obtain the low-phosphorus low-sulfur low-cost master electrode.
2. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the raw materials of the step (1), the proportion of the waste H13 die steel is 70-90wt% and the balance is pure high-quality steel.
3. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (2), when the prepared raw materials are smelted in an intermediate frequency furnace, the smelting temperature is 1480-1540 ℃, the smelting time is controlled to be within 2 hours, and the tapping temperature is 1595-1615 ℃.
4. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (2), the addition amount of the silicon-magnesium rare earth is 2 weight percent of the total weight of the raw materials.
5. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (2), the surface of molten steel can be covered by carbonized chaff or slag remover in the process of melting raw materials in the intermediate frequency furnace.
6. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (3), the adding amount of the slag charge is 3-5wt% of the molten steel amount.
7. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (3), the addition amount of fluorite is 2-3wt% of the amount of molten steel.
8. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (4), the vacuum degree is pumped to below 67 Pa.
9. The process for producing a low-phosphorus low-sulfur low-cost parent electrode according to claim 1, wherein: in the step (4), when the aluminum wires are fed for deoxidization, the aluminum wires are fed according to the amount of 1.8-2.5 m/ton of molten steel per ton.
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CN105886933A (en) * | 2016-05-12 | 2016-08-24 | 天津钢研海德科技有限公司 | High tempering softness resistance and high tenacity hot-work die steel and manufacturing method thereof |
CN108950131A (en) * | 2018-07-10 | 2018-12-07 | 娄永琰 | A kind of smelting and dephosphorization under reducing atmosphere method of H13 mould steel |
US11180820B1 (en) * | 2020-05-20 | 2021-11-23 | University Of Science And Technology Beijing | Hot-work die steel and a preparation method thereof |
CN114540699A (en) * | 2022-02-28 | 2022-05-27 | 江苏宏晟模具钢材料科技有限公司 | High-performance hot-work die steel and preparation method thereof |
WO2023016219A1 (en) * | 2021-08-10 | 2023-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | High-toughness, cold-worked die steel and preparation method therefor |
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CN105886933A (en) * | 2016-05-12 | 2016-08-24 | 天津钢研海德科技有限公司 | High tempering softness resistance and high tenacity hot-work die steel and manufacturing method thereof |
CN108950131A (en) * | 2018-07-10 | 2018-12-07 | 娄永琰 | A kind of smelting and dephosphorization under reducing atmosphere method of H13 mould steel |
US11180820B1 (en) * | 2020-05-20 | 2021-11-23 | University Of Science And Technology Beijing | Hot-work die steel and a preparation method thereof |
WO2023016219A1 (en) * | 2021-08-10 | 2023-02-16 | 攀钢集团攀枝花钢铁研究院有限公司 | High-toughness, cold-worked die steel and preparation method therefor |
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