CN112195362A - Preparation method of white copper strip for heat exchange of ship engine - Google Patents
Preparation method of white copper strip for heat exchange of ship engine Download PDFInfo
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- CN112195362A CN112195362A CN202010980190.3A CN202010980190A CN112195362A CN 112195362 A CN112195362 A CN 112195362A CN 202010980190 A CN202010980190 A CN 202010980190A CN 112195362 A CN112195362 A CN 112195362A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
- C22C9/06—Alloys based on copper with nickel or cobalt as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/08—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon
Abstract
The invention discloses a preparation method of a white copper strip for heat exchange of a ship engine, which comprises the following steps: mixing raw materials and smelting additives according to a weight ratio; carrying out vacuum induction melting on the raw materials and the melting additive to obtain a first semi-finished product of a cupronickel ingot; sawing the head of the first semi-finished product of the cupronickel alloy ingot and putting the head into a resistance furnace for baking to obtain a second semi-finished product of the cupronickel alloy ingot; carrying out electroslag remelting on the second semi-finished product of the cupronickel alloy ingot, and cutting off a dead head and the bottom to obtain a finished product of the cupronickel alloy ingot; forging the finished product of the cupronickel cast ingot in an electro-hydraulic hammer to obtain a first semi-finished product of the cupronickel slab; carrying out hot rolling on the first semi-finished product of the cupronickel slab, and then carrying out acid pickling and intermediate annealing to obtain a second semi-finished product of the cupronickel slab; cold rolling the second semi-finished product of the cupronickel slab to obtain a semi-finished product of the cupronickel strip; and annealing the semi-finished product of the cupronickel strip to obtain the finished product of the cupronickel strip. The method eliminates the defects of porosity, inclusion, shrinkage cavity, subcutaneous blowhole and the like of the cupronickel.
Description
Technical Field
The invention belongs to the technical field of metal material smelting and processing, and particularly relates to a preparation method of a white copper strip for heat exchange of a ship engine.
Background
The common cupronickel alloy (BFe10-1-1) has good corrosion resistance in clean or polluted seawater, can avoid stress corrosion cracking and high-temperature point nickel removal, and because of the characteristics, the cupronickel alloy (BFe10-1-1) is widely used in the fields of heat exchanger equipment using seawater such as power stations, desalination, petrifaction and ships, and the alloy strip generally adopts the following process flows: primary vacuum melting/non-vacuum melting → hot rolling/cold rolling → heat treatment → post treatment.
Due to the limitation of the smelting process, the blank has the defects of looseness, inclusion, shrinkage cavity, subcutaneous air holes and the like, so that the finished product strip has serious surface peeling, unstable quality, low yield and unqualified comprehensive performance, and the use of domestic products in high-end fields is seriously influenced. At present, in high-end fields such as ships, power stations and other heat exchange device manufacturing industries in China, the used cupronickel belts mainly depend on import.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation method of a white copper strip for heat exchange of a ship engine. The technical problem to be solved by the invention is realized by the following technical scheme:
a preparation method of a white copper strip for heat exchange of a ship engine comprises the following steps:
step 1: the raw materials are mixed according to the following weight ratio: 86.5 to 89.5 percent of cathode copper; 9-11% of electrolytic nickel; 1-1.5% of pure iron; 0.5-1% of electrolytic manganese;
adding smelting additives according to the following weight ratio based on the total weight of the raw materials: 0.02 percent of carbon powder; 0.02% of pure titanium; 0.05 percent of nickel-magnesium alloy and 0.025 percent of ferroboron;
step 2: adding the raw materials and the smelting additive in the step 1 into a vacuum induction furnace for vacuum induction smelting to obtain a first semi-finished product of the cupronickel ingot;
and step 3: sawing the head of the first semi-finished product of the cupronickel alloy ingot, and then putting the head into a resistance furnace for baking to obtain a second semi-finished product of the cupronickel alloy ingot; wherein the baking temperature is 400-450 ℃, and the baking time is 6.5-7.5 h;
and 4, step 4: carrying out electroslag remelting on the second semi-finished product of the cupronickel alloy ingot, and cutting off a dead head and the bottom after cooling to obtain a finished product of the cupronickel alloy ingot;
and 5: heating the finished product cupronickel cast ingot to 890-930 ℃, preserving heat for 4.5-5.5 hours, and forging in an electro-hydraulic hammer to obtain a first semi-finished product cupronickel slab;
step 6: heating the first semi-finished product white copper plate blank to 930-870 ℃, carrying out hot rolling, and then carrying out acid pickling and intermediate annealing to obtain a second semi-finished product white copper plate blank;
and 7: cold rolling the second semi-finished product of the cupronickel slab to obtain a semi-finished product of the cupronickel strip;
and 8: and carrying out on-line bright annealing on the semi-finished product of the cupronickel strip to obtain a finished product of the cupronickel strip.
Further, step 2 comprises:
step 2.1: sequentially adding the cathode copper, carbon powder, pure titanium, electrolytic nickel and pure iron into the vacuum induction furnace for heating, and obtaining a first liquid metal after all the materials are molten;
step 2.2: refining the first liquid metal, and sequentially adding the electrolytic manganese, the ferroboron alloy and the nickel-magnesium alloy into the refined first liquid metal and sequentially melting to obtain a second liquid metal;
step 2.3: and heating the vacuum induction furnace, and pouring the second liquid metal when the temperature reaches 1330-1350 ℃ to obtain the first semi-finished white copper alloy ingot.
Further, the slag of the electroslag remelting in the step 3 comprises: calcium fluoride, calcium oxide, and magnesium oxide; the weight ratio of the slag charge is as follows: 55-60% of calcium fluoride; 10-15% of calcium oxide; 30-35% of magnesium oxide.
The invention has the beneficial effects that:
1. by adjusting the technological parameters and the operation method of vacuum induction melting and electroslag remelting, the alloy components, segregation elements and impurity content are strictly controlled, so that the produced white copper strip ingot has fine crystal grains, no segregation and low content of O, N and other harmful elements;
2. the two-step process of vacuum induction melting and electroslag remelting is adopted, so that the metallurgical defects of looseness, inclusion, shrinkage cavity, subcutaneous air holes and the like of the blank are eliminated, and the high-quality blank is provided for the subsequent processing process;
3. the preparation method provided by the invention has the advantages of operability, high yield of the cupronickel strip and excellent product quality.
4. Compared with the existing production method, the invention has the advantages of low processing cost and excellent comprehensive performance of the strip, and is convenient for batch industrial production.
Drawings
FIG. 1 is a finished white copper ingot obtained by electroslag remelting according to an embodiment of the invention;
FIG. 2 is a cupronickel strip with a thickness of 0.15mm prepared by an example of the invention;
FIG. 3 is a gold phase diagram of a cupronickel strip produced in accordance with an embodiment of the invention;
fig. 4 shows a heat exchange device of a ship engine manufactured by applying the cupronickel belt prepared by the invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but the embodiments of the present invention are not limited thereto.
The embodiment of the invention provides a preparation method of a white copper strip for heat exchange of a ship engine, the prepared white copper strip has the specifications of 0.15 x 400 x Lmm, 0.35 x 400 x Lmm and 1.56 x 400 x Lmm, and the weight of a single roll is not less than 500 kg. In the examples of the present invention, δ represents a thickness, L represents a length, and Φ represents a diameter.
The method specifically comprises the following steps:
step 1: mixing raw materials and a smelting additive according to the following weight ratio, wherein the raw materials comprise cathode copper, electrolytic nickel, pure iron and electrolytic manganese; the smelting additive comprises: carbon powder, pure titanium, nickel-magnesium alloy and ferroboron alloy; wherein the proportion of each component is shown in table 1, the total weight of the raw materials is 100%, and the smelting additive is prepared according to the total weight ratio base number of the raw materials; the alloy proportion is beneficial to accurately controlling the contents of each element, interstitial element and impurity element; wherein, the magnesium content in the nickel-magnesium alloy is 30 percent, and the nickel content is 70 percent; interstitial elements include elements generated during the production of the cupronickel strip, including oxynitrides, etc.
TABLE 1 raw material and smelting additive ratio
Step 2: and carrying out vacuum induction melting on the raw materials and the melting additive by using a vacuum induction furnace to obtain a first semi-finished product of the cupronickel ingot.
The vacuum induction furnace adopted in the embodiment of the invention is 2T, the specification of the pouring mould is phi 440 x 1600mm, and the furnace charging amount is 1750kg per furnace; the total number of the furnaces is 2, and two first semi-finished white copper ingots are obtained.
It should be noted that if the casting mold specification for vacuum induction melting is large enough, the capacity of the vacuum induction furnace is large enough, and the charging amount is large enough, a large ingot can be obtained at one time.
The step 2 specifically comprises the following steps:
step 2.1: dividing cathode copper into two parts, firstly, filling the first part of cathode copper into a crucible, then adding additive carbon powder and pure titanium, and then adding electrolytic nickel, pure iron and the second part of cathode copper; adding additive ferroboron into the first lattice of the alloy bin, and adding additive nickel-magnesium alloy into the third lattice of the alloy bin; electrolytic manganese is added into a hopper below the furnace cover. Because the cathode copper is blocky, in order to ensure that all materials added firstly can be filled into the crucible, the cathode copper is divided into two parts for adding, and the content of the cathode copper of the first part is 20-30% of the content of the cathode copper of the whole part; the second part of cathode copper is the rest cathode copper; the ferroboron, the nickel-magnesium alloy and the electrolytic manganese are extremely volatile, so that the ferroboron, the nickel-magnesium alloy and the electrolytic manganese are added at last.
After the furnace is filled, starting to vacuumize the vacuum induction furnace, starting to heat up after the vacuum degree is less than or equal to 5Pa, slowly increasing the power of the vacuum induction furnace to the optimal smelting power according to different furnace types and different heating systems, increasing the power to 25kw according to a system of 5kw/5min below 25kw, and increasing the power to 35kw according to a system of 5kw/10min above 35 kw; smelting under high vacuum degree when the material is not converted into liquid in the smelting process, wherein the highest vacuum degree can reach 0.5Pa, so that the vacuum induction furnace is fully degassed, and the vacuum is maintained between 5Pa and 10Pa after the material is converted into liquid; when all the materials are liquid, the first liquid metal is obtained.
Step 2.2: closing the large valve, refining the first liquid metal for 10min, and opening the large valve to pump out volatile matters if the sight line in the furnace is poor in the refining process; after refining is finished, powering off and closing the valve, adding electrolytic manganese below the furnace cover at one time, then opening the valve, transmitting power, then melting the electrolytic manganese, adding ferroboron in the alloy bin at one time after the electrolytic manganese is converted into liquid, transmitting power after the electrolytic manganese is added, and then melting the ferroboron; closing the big valve and powering off after the nickel magnesium alloy is converted into liquid, then adding the nickel magnesium alloy in the alloy bin, stirring for 3min, and mashing and wrapping the nickel magnesium alloy with copy paper before adding the nickel magnesium alloy; obtaining a second liquid metal after all materials are converted into liquid;
step 2.3: and (3) after the liquid level is calm, heating the vacuum induction furnace, pouring the second liquid metal when the temperature reaches 1330-1350 ℃, finishing pouring within 3min, wherein the pouring power is 350-400 kw, opening the ingot to an ingot mold chamber after pouring, cooling for 30-40 min, and discharging to obtain the first semi-finished white copper ingot.
Wherein, the carbon powder and the pure titanium are both used for deoxidation; the addition of ferroboron and nickel-magnesium alloy is favorable for deoxidation, desulfurization and grain refinement of cast ingots so as to improve the processing performance of the cast ingots, and meanwhile, the selection of various process parameters is favorable for effectively controlling the alloy components and impurity content and eliminating segregation.
And step 3: sawing the head parts of the two first semi-finished white copper cast ingots, and then placing the head parts into a resistance furnace for baking to obtain two second semi-finished white copper cast ingots; the baking temperature is 400-450 ℃, and the baking time is 7 hours, so that cooling liquid permeating into the cupronickel cast ingot during sawing is eliminated, and no air hole inclusion is generated in subsequent finished products.
And 4, step 4: and carrying out electroslag remelting on the second semi-finished product of the cupronickel alloy ingot, and cutting off a dead head and the bottom after cooling to obtain the finished product of the cupronickel alloy ingot.
And (3) electrode welding is carried out on the two second semi-finished white copper cast ingots obtained in the step (3) to form a remelting electrode, then the electrode is preheated, the preheating temperature is 400-500 ℃, the preheating time is 5-6 hours, and the fact that liquid attached to the electrode is fully baked is guaranteed.
Specifically, the specifications of a crystallizer adopted for remelting are phi 530/phi 570 multiplied by 2000 mm; the dummy electrode is phi 200 × 1000mm, the auxiliary electrode is phi 300 × 1300mm, and the remelting electrode is phi 440 × Lmm; the false electrode is made of pure nickel, and the auxiliary electrode is made of steel; checking the welding quality and concentricity between the electrodes before charging; during charging, the surface of a bottom water tank and the surface of a steel ring are polished clean and then are loaded into a bottom pad, and the bottom pad is made of BFe 10-1-1; filling a little slag between the bottom pad and the steel ring, and putting 500-550 g of arc striking agent on the bottom pad; wherein the components of the slag are shown in Table 2; finally, the crystallizer is hung on the steel ring, and the dislocation between the crystallizer and the steel ring is required to be less than 2 mm; then, a remelting electrode is placed into a crystallizer and is arranged on a holder, the electrode is centered on the crystallizer by adjusting the positions of a large arm and a trolley, then the remelting electrode is quickly descended, high voltage is supplied when the electrode is 100mm away from an arc striking agent and slowly descended, slag is quickly added after arcing, current and voltage are in a stable state through manual control, the slag adding process is uniform, if the current is abnormally excessive, the remelting electrode is quickly lifted, a bottom water tank is observed when the remelting electrode is lifted, the bottom water tank is prevented from being brought up, slag adding is completed within 40min, and slag forming is completed within 1 h; the remelting process is automatic material, the water temperature needs to be observed, and feeding is carried out when remelting is carried out until the electrode is about 150mm, so that pores are prevented from being formed; and (3) cooling the remelted second semi-finished white copper ingot, and then sawing the head and the tail of the ingot clean to obtain a finished white copper alloy ingot, as shown in figure 1.
TABLE 2 slag charge ratio
| Slag charge | Calcium fluoride | Calcium oxide | Magnesium oxide |
| Ratio (%) | 55～60 | 10～15 | 30～35 |
| Weight (kg) | 71.5～78 | 13～19.5 | 39～45.5 |
The selection of the slag system and the specific technological parameters of remelting in the process ensure that the alloy cast ingot with the single weight of more than 3 tons has high purity and no metallurgical defects such as looseness, inclusion, shrinkage cavity, subcutaneous air holes and the like.
And 5: and heating the finished product of the cupronickel alloy cast ingot to 910 ℃, preserving the heat for 5 hours, and forging in an electro-hydraulic hammer to obtain a first semi-finished product of the cupronickel slab.
Considering the operability of a forging press and the specification and quantity of finished white copper strips, respectively forging 3T finished white copper ingots in a 5T electro-hydraulic hammer after four equal divisions, heating the ingots by a resistance furnace to 910 ℃, keeping the temperature for 5 hours, discharging the ingots, sequentially upsetting and drawing the ingots in the electro-hydraulic hammer, tempering the ingots in the resistance furnace at the heating temperature of 910 ℃, keeping the temperature for 1-1.5 hours, forging the ingots into delta 80+ 5X 400X Lmm plates in the electro-hydraulic hammer, and carrying out surface treatment to obtain four first semi-finished white copper plate blanks; wherein the finish forging temperature of the whole forging process is not lower than 750 ℃.
The forging process parameters determined in the step 5 can ensure that the white copper alloy crystal grains are fully crushed and ensure good subsequent processing performance.
Step 6: and heating the first semi-finished product of the cupronickel slab to 850 ℃ for hot rolling, and then carrying out acid pickling and intermediate annealing after the hot rolling to obtain a second semi-finished product of the cupronickel slab.
Heating the first semi-finished product of the cupronickel slab to 850 ℃, carrying out two-fire rolling by using a hot rolling mill with the thickness of 450mm, rolling the first semi-finished product of the cupronickel slab into a slab delta 80 → delta 5 multiplied by 400 multiplied by Lmm, wherein the final rolling temperature is not less than 700 ℃, strictly controlling the rolling temperature in the rolling process, and then carrying out acid pickling and intermediate annealing; and (3) carrying out acid cleaning treatment on the oxide layer on the surface of the plate by using hydrofluoric acid and nitric acid, washing the oxide layer by using tap water, annealing in a bell-type furnace at the intermediate annealing temperature of 680 ℃, determining proper heat preservation time according to the specification of a finished product, and cooling to room temperature along with the furnace to obtain four second semi-finished white copper plate blanks.
The hot rolling temperature is different from that of the traditional cupronickel strip, and the finished product cupronickel strip prepared at the temperature of 850 ℃ has good ductility and exceeds the performance requirement of the cupronickel strip for heat exchange of a normal ship engine.
The acid solution for pickling is prepared from sulfuric acid, nitric acid, sodium chloride and water according to a certain proportion, wherein the volume ratio of the sulfuric acid to the nitric acid to the sodium chloride to the water is as follows: 18:17:3: 62; the acid liquor proportioning can ensure that an oxide layer on the surface of the blank is cleaned; and the intermediate annealing process after pickling can complete recrystallization while completely eliminating stress of the blank, thereby providing guarantee for obtaining good plasticity in the subsequent processing.
And 7: and cold rolling the second semi-finished product of the cupronickel slab to obtain a semi-finished product of the cupronickel strip.
Before cold rolling, splicing and welding four second semi-finished white copper plate blanks of delta 5mm in the length direction in a vacuum argon arc welding machine, then manually polishing, and cleaning local defects on the surfaces of the blanks; then cold rolling the steel plate to delta 3.0 multiplied by 400 multiplied by Lmm in a four-roller cold rolling mill with the thickness of 450mm, and then carrying out online bright annealing at the annealing temperature of 800 +/-10 ℃ and the annealing speed of 1 m/min; after annealing, continuously performing cold rolling on the steel plate by a 450mm cold rolling mill to delta 1.7 multiplied by 400 multiplied by Lmm; finally, cold rolling the blank to strips with the width of delta 1.56mm, delta 0.35mm, delta 0.15mm and the width of 400mm in a twenty-high rolling mill respectively to obtain the semi-finished white copper strip.
It should be noted that before the strip with the specification of delta 1.7 multiplied by 400 multiplied by Lmm is rolled into the strips with the specification of delta 0.35mm and delta 0.15mm, on-line bright annealing is required to ensure the performance of the formed strip.
The cold rolling process ensures that the prepared cupronickel strip has smooth surface and thickness tolerance meeting the expected requirement.
And 8: carrying out on-line bright annealing on the semi-finished product of the cupronickel strip to obtain a finished product of the cupronickel strip; wherein the annealing temperature is 800 ℃, the annealing speed is 6m/min, the grain size of the product can reach more than 8.0 grade, and the mechanical property is far higher than the standard requirement. Fig. 2 shows the finished cupronickel strip obtained with a thickness of 0.15 mm.
Sampling the finished white copper strip, and carrying out physical and chemical analysis, wherein the detection results are shown in table 3; the results of the impurity element analysis of the cupronickel strip are shown in table 4:
TABLE 3 mechanical Properties of cupronickel strips of different thicknesses
Note that T1 and T2 are two positions taken in the width direction of the cupronickel strip, respectively.
TABLE 4 analysis of the impurity elements of the cupronickel strip
| Element(s) | O | N | H | S |
| Content/% | ≤0.002 | <0.001 | <0.001 | <0.001 |
The mechanical properties and the grain size of the cupronickel strip with the diameter delta of 0.15 mm-1.56 mm prepared by the process are shown in table 3 under the room temperature condition, the tensile strength of the cupronickel strip meets the standard requirement, and the plasticity of the cupronickel strip is far higher than the standard; the impurity element content is shown in table 4, and it can be seen that the obtained cupronickel strip has extremely low impurity element content; as shown in FIG. 3, through metallographic observation, the grain size of the cupronickel strip is uniform, the grain boundaries are clean and clear, and the requirement of the national standard GB/T2040 is completely met. The cupronickel strip prepared by the invention completely meets the manufacturing requirements of the heat exchange device of the ship engine after being used and tested by certain ship engine manufacturers in China, and the heat exchange device of the ship engine manufactured by the cupronickel strip prepared by the invention is shown in figure 4, and each test result of the heat exchange device is well reflected (because relevant regulations of technical secrecy are provided, relevant data are not obtained), and the cupronickel strip can replace imported materials.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (3)
1. A preparation method of a white copper strip for heat exchange of a ship engine is characterized by comprising the following steps:
step 1: the raw materials are mixed according to the following weight ratio: 86.5 to 89.5 percent of cathode copper; 9-11% of electrolytic nickel; 1-1.5% of pure iron; 0.5-1% of electrolytic manganese;
adding smelting additives according to the following weight ratio based on the total weight of the raw materials: 0.02 percent of carbon powder; 0.02% of pure titanium; 0.05 percent of nickel-magnesium alloy and 0.025 percent of ferroboron;
step 2: adding the raw materials and the smelting additive in the step 1 into a vacuum induction furnace for vacuum induction smelting to obtain a first semi-finished product of the cupronickel ingot;
and step 3: sawing the head of the first semi-finished product of the cupronickel alloy ingot, and then putting the head into a resistance furnace for baking to obtain a second semi-finished product of the cupronickel alloy ingot; wherein the baking temperature is 400-450 ℃, and the baking time is 6.5-7.5 h;
and 4, step 4: carrying out electroslag remelting on the second semi-finished product of the cupronickel alloy ingot, and cutting off a dead head and the bottom after cooling to obtain a finished product of the cupronickel alloy ingot;
and 5: heating the finished product cupronickel cast ingot to 890-930 ℃, preserving heat for 4.5-5.5 hours, and forging in an electro-hydraulic hammer to obtain a first semi-finished product cupronickel slab;
step 6: heating the first semi-finished product white copper plate blank to 830-870 ℃, carrying out hot rolling, and then carrying out acid pickling and intermediate annealing to obtain a second semi-finished product white copper plate blank;
and 7: cold rolling the second semi-finished product of the cupronickel slab to obtain a semi-finished product of the cupronickel strip;
and 8: and carrying out on-line bright annealing on the semi-finished product of the cupronickel strip to obtain a finished product of the cupronickel strip.
2. The method for preparing the white copper strip for ship engine heat exchange according to claim 1, wherein the step 2 comprises the following steps:
step 2.1: sequentially adding the cathode copper, carbon powder, pure titanium, electrolytic nickel and pure iron into the vacuum induction furnace for heating, and obtaining a first liquid metal after all the materials are molten;
step 2.2: refining the first liquid metal, and sequentially adding the electrolytic manganese, the ferroboron alloy and the nickel-magnesium alloy into the refined first liquid metal and sequentially melting to obtain a second liquid metal;
step 2.3: and heating the vacuum induction furnace, and pouring the second liquid metal when the temperature reaches 1330-1350 ℃ to obtain the first semi-finished white copper alloy ingot.
3. The method for preparing the white copper strip for ship engine heat exchange according to claim 1, wherein the electroslag remelting slag in the step 3 comprises: calcium fluoride, calcium oxide, and magnesium oxide; the weight ratio of the slag charge is as follows: 55-60% of calcium fluoride; 10-15% of calcium oxide; 30-35% of magnesium oxide.
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| CN113293317A (en) * | 2021-05-08 | 2021-08-24 | 宝钛集团有限公司 | Preparation method of pure nickel plate with high cold formability |
| CN115383400A (en) * | 2022-08-08 | 2022-11-25 | 陕西斯瑞新材料股份有限公司 | Low-cost copper-chromium contact batch processing method |
| CN115652117A (en) * | 2022-11-22 | 2023-01-31 | 江苏隆达超合金股份有限公司 | Copper-nickel alloy reclaimed material casting desulfurization process |
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| CN113293317A (en) * | 2021-05-08 | 2021-08-24 | 宝钛集团有限公司 | Preparation method of pure nickel plate with high cold formability |
| CN115383400A (en) * | 2022-08-08 | 2022-11-25 | 陕西斯瑞新材料股份有限公司 | Low-cost copper-chromium contact batch processing method |
| CN115383400B (en) * | 2022-08-08 | 2023-10-13 | 陕西斯瑞新材料股份有限公司 | Low-cost batch processing method for copper-chromium contacts |
| CN115652117A (en) * | 2022-11-22 | 2023-01-31 | 江苏隆达超合金股份有限公司 | Copper-nickel alloy reclaimed material casting desulfurization process |
| CN115652117B (en) * | 2022-11-22 | 2023-12-05 | 江苏隆达超合金股份有限公司 | Copper-nickel alloy reclaimed material casting desulfurization process |
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