CN112921232B - Corrosion-resistant gray cast iron for water pump and production method thereof - Google Patents
Corrosion-resistant gray cast iron for water pump and production method thereof Download PDFInfo
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Abstract
The invention discloses corrosion-resistant gray cast iron for a water pump and a production method thereof, wherein the corrosion-resistant gray cast iron for the water pump comprises the following chemical components in percentage by mass: 2.6 to 3.6 percent of carbon, 1.2 to 3.0 percent of silicon, 0.4 to 1.2 percent of manganese, 0.02 to 0.15 percent of phosphorus, 0.05 to 0.15 percent of sulfur, 0.5 to 2.0 percent of nickel, 0.5 to 2.0 percent of chromium, 0.5 to 1.5 percent of copper, 0.5 to 1.5 percent of cobalt, 84.4 to 94.23 percent of iron and the balance of inevitable impurities; the production method of the corrosion-resistant gray cast iron for the water pump comprises the following steps: material preparation and smelting: preparing materials according to the component requirements of target products, adding main raw materials of scrap steel, pig iron and return materials into an intermediate frequency furnace, and then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace; and (3) recarburization treatment: adding a carburant to carry out carburant treatment when molten iron is in a molten state, and controlling the temperature to be 1500-1630 ℃; inoculation treatment: adding an inoculant to the bottom of the ladle before discharging, and pouring molten iron into the ladle, wherein the temperature is controlled to be 1400-1460 ℃; casting: and casting the inoculated molten iron into a sand mold, and controlling the temperature to be 1360-1410 ℃. The invention obviously improves the corrosion resistance of the gray cast iron for the water pump.
Description
Technical Field
The invention belongs to the technical field of metal materials, and particularly relates to corrosion-resistant gray cast iron for a water pump and a production method thereof.
Background
Cast iron is mainly an iron-carbon alloy material with a carbon content of more than 2.11%, and is widely applied to mechanical manufacturing. The common gray cast iron in the prior art usually comprises, by mass, 2.8-3.8% of carbon, 1.3-2.7% of silicon, 0.5-1.2% of manganese, 0-0.3% of phosphorus, 0-0.15% of sulfur, and the balance of iron and impurities. The main elements in the gray cast iron are carbon, silicon, iron and the like, so the gray cast iron is lack of passivation elements, a passivation film is difficult to form on the surface, and the gray cast iron is easy to corrode in water, particularly sewage, and in addition, the corrosion resistance of the gray cast iron is influenced to a certain extent by a pearlite structure. Therefore, gray cast iron generally has poor corrosion resistance, and gray cast iron for water pumps is required to have high corrosion resistance.
Disclosure of Invention
In order to solve the problems, the invention provides corrosion-resistant gray cast iron for a water pump and a production method thereof, which are used for obviously improving the corrosion resistance of the gray cast iron for the water pump so as to prolong the service life of the water pump.
The corrosion-resistant gray cast iron for the water pump comprises the following chemical components in percentage by mass: 2.6 to 3.6 percent of carbon, 1.2 to 3.0 percent of silicon, 0.4 to 1.2 percent of manganese, 0.02 to 0.15 percent of phosphorus, 0.05 to 0.15 percent of sulfur, 0.5 to 2.0 percent of nickel, 0.5 to 2.0 percent of chromium, 0.5 to 1.5 percent of copper, 0.5 to 1.5 percent of cobalt, 84.4 to 94.23 percent of iron and the balance of inevitable impurities.
Preferably, in the corrosion-resistant gray cast iron for a water pump of the present invention, the carbon equivalent in the corrosion-resistant gray cast iron for a water pump is controlled to: CE ═ ω (C) +1/3[ ω (Si) + ω (P), where ω (C) is the mass percent of carbon in the corrosion-resistant gray cast iron for water pumps, ω (Si) is the mass percent of silicon in the corrosion-resistant gray cast iron for water pumps, and ω (P) is the mass percent of phosphorus in the corrosion-resistant gray cast iron for water pumps.
Preferably, in the corrosion-resistant gray cast iron for a water pump according to the present invention, the carbon equivalent in the corrosion-resistant gray cast iron for a water pump is controlled to be 3.6% to 4.0%.
Preferably, in the corrosion-resistant gray cast iron for a water pump according to the present invention, the silicon-carbon ratio of the corrosion-resistant gray cast iron for a water pump is controlled to be 0.57 to 0.65.
The production method of the corrosion-resistant gray cast iron for the water pump comprises the following steps:
preparing materials and smelting: batching is carried out according to the component requirements of target products, firstly, main raw materials of scrap steel, pig iron and return are added into an intermediate frequency furnace, then ferromanganese, ferrosilicon, ferric sulfide, ferrochrome, copper, cobalt, nickel and other alloys are added into the intermediate frequency furnace, and then smelting is carried out, wherein the chemical components of batching are controlled as follows according to the mass percentage: 2.6 to 3.6 percent of carbon, 1.2 to 3.0 percent of silicon, 0.4 to 1.2 percent of manganese, 0.02 to 0.15 percent of phosphorus, 0.05 to 0.15 percent of sulfur, 0.5 to 2.0 percent of nickel, 0.5 to 2.0 percent of chromium, 0.5 to 1.5 percent of copper, 0.5 to 1.5 percent of cobalt, 84.4 to 94.23 percent of iron and the balance of inevitable impurities;
(II) recarburization treatment: adding a carburant to carry out carburant treatment when molten iron in the intermediate frequency furnace is in a molten state, wherein the temperature of the carburant treatment is controlled to be 1500-1630 ℃;
(III) inoculation treatment: adding an inoculant into the ladle bottom before discharging, and pouring molten iron into the ladle, wherein the temperature of the molten iron is controlled to be 1400-1460 ℃;
(IV) casting: and casting the inoculated molten iron into a sand mold, wherein the casting temperature is controlled to be 1360-1410 ℃.
Preferably, in the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention, the temperature of the carburization process in the carburization process step is controlled to 1610 ℃, the temperature of the molten iron in the inoculation process step is controlled to 1420 ℃, and the casting temperature in the casting step is controlled to 1380 ℃.
Preferably, in the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention, the temperature of the carburization process in the carburization process step is controlled to 1615 ℃, the temperature of the molten iron in the inoculation process step is controlled to 1425 ℃, and the casting temperature in the casting step is controlled to 1385 ℃.
Preferably, in the method for producing corrosion-resistant gray cast iron for water pumps according to the present invention, the temperature of the carburization in the carburization step is controlled to 1612 ℃, the temperature of the molten iron in the inoculation step is controlled to 1428 ℃, and the casting temperature in the casting step is controlled to 1387 ℃.
Preferably, in the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention, the temperature of the carburization process in the carburization process step is controlled to be 1613 ℃, the temperature of the molten iron in the inoculation process step is controlled to be 1423 ℃, and the casting temperature in the casting step is controlled to be 1378 ℃.
Preferably, in the above method for producing corrosion-resistant gray cast iron for a water pump of the present invention, the ratio of scrap, pig iron, and returned material in the batching and smelting step is controlled to be 50:25: 25.
The corrosion-resistant gray cast iron for the water pump and the production method thereof have the beneficial effects that: in the corrosion-resistant gray cast iron for the water pump, the content of elements such as nickel, chromium, copper, cobalt and the like is controlled in a proper range, so that the corrosion resistance of the gray cast iron is obviously improved, the requirement of high corrosion resistance of the gray cast iron for the water pump is completely met, and the service life of the water pump is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention;
FIG. 2 is a graph showing the results of a corrosion rate test of corrosion-resistant gray cast iron for a water pump produced by the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention, with respect to conventional gray cast iron in the prior art.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The corrosion-resistant gray cast iron for the water pump comprises the following chemical components in percentage by mass: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
In gray cast iron, carbon is one of the main alloys, and a relatively high content of carbon is required to ensure that the carbon in gray cast iron can form graphite and be in a favorable flake form; at the same time, too high a carbon content makes the graphite coarse. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of carbon is controlled to be 2.6-3.6 percent by mass. .
Silicon is the element with the highest content except iron and carbon in gray cast iron, and influences eutectoid transformation and eutectic transformation temperature of FeC alloy, so that a relatively high silicon element is needed; however, silicon tends to promote the formation of free ferrite, resulting in a decrease in the performance of gray cast iron. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of silicon is controlled to be 1.2-3.0 percent by mass.
Manganese has the effect of promoting and refining pearlite, and forms MnS with sulfur, and the Mn% is required to be more than or equal to 1.7S% to +0.3 so as to weaken the harmful effect of sulfur; however, too high manganese promotes the production of cementite, hinders graphitization, and deteriorates workability. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of manganese is controlled to be 0.4-1.2 percent by mass.
Phosphorus in gray cast iron has a similar effect as silicon and is part of the carbon equivalent calculation, and therefore a relatively high silicon element is required; however, when the phosphorus content exceeds 0.2%, a phosphorus eutectic is formed, so that the tendency of the casting to be loosened is increased, the brittleness of the casting is increased, and the strength of the casting is reduced. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of phosphorus in percentage by mass is controlled to be 0.02-0.15%.
Sulfur easily causes the generation of intercrystalline cementite, has strong whitening effect, and deteriorates casting, cutting performance and mechanical performance; however, the appropriate sulfur element promotes graphite nucleation. Therefore, in the corrosion-resistant gray cast iron for the water pump, the sulfur content is controlled to be 0.05-0.15 percent by mass.
The nickel can inhibit ferrite precipitation, refine pearlite and improve mechanical property, the nickel is a main element for promoting the formation of the surface protection film, but in order to control the total production cost, the mass percentage content of the nickel in the corrosion-resistant gray cast iron for the water pump is controlled to be 0.5-2.0%.
The chromium and the nickel are added simultaneously, ferrite precipitation can be inhibited, the mechanical property is improved, and the density of an oxide film can be improved by the chromium; however, chromium tends to cause the white tendency of gray cast iron. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of chromium is controlled to be 0.5-2.0 percent by mass.
Copper can promote the formation of pearlite and improve the hardenability, and copper can effectively improve the corrosion resistance of gray cast iron; but copper has limited solubility in iron. Therefore, in the corrosion-resistant gray cast iron for the water pump, the copper content is controlled to be 0.5-1.5 percent by mass.
Cobalt is an austenite forming element as well as nickel and copper, suppresses ferrite precipitation, promotes pearlite formation, has a higher hardenability than copper, and is advantageous for improving the corrosion resistance of gray cast iron. Therefore, in the corrosion-resistant gray cast iron for the water pump, the content of cobalt in percentage by mass is controlled to be 0.5-1.5%.
Carbon Equivalent (CE) is the combined effect of carbon and silicon on gray cast iron, and it directly affects the solidification process and solidification structure of gray cast iron. Similar to the carbon content, too high a carbon equivalent makes the graphite coarse, resulting in a decrease in the strength of the gray cast iron; the carbon equivalent is too low, and white spots tend to be formed. Thus, as a specific embodiment, in the corrosion-resistant gray cast iron for a water pump of the present invention, the carbon equivalent CE is controlled to: CE ═ ω (C) +1/3[ ω (Si) + ω (P), where ω (C) is the mass percent of carbon in the corrosion-resistant gray cast iron for water pumps, ω (Si) is the mass percent of silicon in the corrosion-resistant gray cast iron for water pumps, and ω (P) is the mass percent of phosphorus in the corrosion-resistant gray cast iron for water pumps.
Preferably, in the corrosion-resistant gray cast iron for a water pump according to the present invention, the carbon equivalent CE is controlled to be 3.6% to 4.0%.
In addition, the strength of gray cast iron can be improved by increasing the silicon-carbon ratio (Si/C), but too high a silicon-carbon ratio affects the graphite morphology. Therefore, as a specific embodiment, in the corrosion-resistant gray cast iron for a water pump according to the present invention, the Si/C ratio is controlled to be 0.57 to 0.65.
As shown in FIG. 1, the method for producing corrosion-resistant gray cast iron for a water pump according to the present invention comprises the steps of:
(I) proportioning and smelting
The method comprises the following steps of proportioning according to the component requirements of target products, firstly adding main raw materials of scrap steel, pig iron and return materials into an intermediate frequency furnace, then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace, and then smelting, wherein the proportion of the scrap steel, the pig iron and the return materials is controlled to be 50:25:25, and the chemical components of the proportioning are controlled as follows by mass percent: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
(II) carburisation treatment
And when the molten iron in the intermediate frequency furnace is in a molten state, adding a carburant for carburant treatment, wherein the temperature of the carburant treatment is controlled to be 1500-1630 ℃. Preferably, the carburant is a petroleum coke carburant.
(III) inoculation treatment
Adding an inoculant into the ladle bottom before discharging, and pouring molten iron into the ladle, wherein the temperature of the molten iron is controlled to be 1400-1460 ℃. Preferably, the inoculant is a ferrosilicon inoculant.
(IV) casting
And casting the inoculated molten iron into a sand mold, wherein the casting temperature is controlled to be 1360-1410 ℃.
The corrosion-resistant gray cast iron for a water pump and the method for producing the same according to the present invention will be described in detail with reference to the following embodiments.
Example one
The production method of the corrosion-resistant gray cast iron for the water pump comprises the following steps of:
(I) proportioning and smelting
Batching according to the component requirements of target products, firstly adding scrap steel, pig iron and return materials in a ratio of 50:25:25 into an intermediate frequency furnace, then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace, and then smelting, wherein the chemical components of the batching are controlled as follows according to the mass percentage: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
(II) carburisation treatment
And (3) powering to raise the temperature, measuring the temperature at 1610 ℃, adding a recarburizing agent, and sampling and analyzing the components of carbon and silicon in the recarburizing treatment process, wherein the carbon content is 3.24 percent and the silicon content is 1.5 percent.
(III) inoculation treatment
Before the steel is taken out of the furnace, a ferrosilicon inoculant is added to the bottom of the ladle, molten iron is poured into the ladle at the temperature of 1420 ℃, and the components of the ferrosilicon inoculant, namely 3.1% of carbon, 1.9% of silicon, 0.8% of manganese, 0.04% of phosphorus, 0.035% of sulfur, 1.0% of nickel, 1.0% of chromium, 0.8% of copper and 0.6% of cobalt are sampled and analyzed.
(IV) casting
Casting the inoculated molten iron into a sand mould at 1380 ℃.
Example two
The production method of the corrosion-resistant gray cast iron for the water pump in the second embodiment of the invention comprises the following steps:
(I) proportioning and smelting
Batching according to the component requirements of target products, firstly adding scrap steel, pig iron and return materials in a ratio of 50:25:25 into an intermediate frequency furnace, then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace, and then smelting, wherein the chemical components of the batching are controlled as follows according to the mass percentage: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
(II) carburisation treatment
And (3) powering, heating, measuring the temperature by 1615 ℃, adding a carburant, and sampling and analyzing the components of carbon and silicon in the carburant treatment process, wherein the carbon content is 3.4 percent and the silicon content is 1.52 percent.
(III) inoculation treatment
Before the steel is taken out of the furnace, a ferrosilicon inoculant is added to the bottom of the ladle, molten iron is poured into the ladle at the temperature of 1425 ℃, and the components including 3.2% of carbon, 1.9% of silicon, 0.78% of manganese, 0.032% of phosphorus, 0.037% of sulfur, 1.5% of nickel, 1.5% of chromium, 0.82% of copper and 0.64% of cobalt are sampled and analyzed.
(IV) casting
Casting the inoculated molten iron into a sand mould at 1385 ℃.
EXAMPLE III
The production method of the corrosion-resistant gray cast iron for the water pump in the third embodiment of the invention comprises the following steps:
(I) proportioning and smelting
Batching according to the component requirements of target products, firstly adding scrap steel, pig iron and return materials in a ratio of 50:25:25 into an intermediate frequency furnace, then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace, and then smelting, wherein the chemical components of the batching are controlled as follows according to the mass percentage: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
(II) carburisation treatment
And (5) powering on, heating, measuring the temperature to 1612 ℃, and adding a carburant. The process was sampled for analysis of carbon and silicon components, with 3.13% carbon and 1.6% silicon.
(III) inoculation treatment
Before discharging, a ferrosilicon inoculant is added to the bottom of the ladle, molten iron is poured into the ladle, and the temperature is 1428 ℃. And sampled for analysis of components, carbon 3.15%, silicon 1.95%, manganese 0.79%, phosphorus 0.035%, sulfur 0.035%, nickel 1.8%, chromium 1.8%, copper 0.9%, cobalt 0.68%.
(IV) casting
Casting the inoculated molten iron into a sand mould at 1387 ℃.
Example four
The production method of the corrosion-resistant gray cast iron for the water pump in the fourth embodiment of the invention comprises the following steps:
(I) proportioning and smelting
Batching according to the component requirements of target products, firstly adding scrap steel, pig iron and return materials in a ratio of 50:25:25 into an intermediate frequency furnace, then adding ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt, nickel and other alloys into the intermediate frequency furnace, and then smelting, wherein the chemical components of the batching are controlled as follows according to the mass percentage: 2.6 to 3.6 percent of carbon (C), 1.2 to 3.0 percent of silicon (Si), 0.4 to 1.2 percent of manganese (Mn), 0.02 to 0.15 percent of phosphorus (P), 0.05 to 0.15 percent of sulfur (S), 0.5 to 2.0 percent of nickel (Ni), 0.5 to 2.0 percent of chromium (Cr), 0.5 to 1.5 percent of copper (Cu), 0.5 to 1.5 percent of cobalt (Co), 84.4 to 94.23 percent of iron (Fe) and the balance of inevitable impurities.
(II) carburisation treatment
The power is supplied to raise the temperature, the temperature is measured at 1613 ℃, and the carburant is added. The process was sampled for analysis of carbon and silicon components, with 3.2% carbon and 1.58% silicon.
(III) inoculation treatment
Before discharging, a ferrosilicon inoculant is added to the bottom of the ladle, molten iron is poured into the ladle, and the temperature is 1423 ℃. And sampled for analysis of components, carbon 3.1%, silicon 1.96%, manganese 0.81%, phosphorus 0.03%, sulfur 0.036%, nickel 1.9%, chromium 1.7%, copper 0.95%, cobalt 0.72%.
(IV) casting
Casting the inoculated molten iron into a sand mould at the temperature of 1378 ℃.
The corrosion-resistant gray cast iron for a water pump produced by the above four examples of the present invention was immersed in seawater together with the conventional gray cast iron, and the corrosion rate test was performed, and the test results are shown in fig. 2. Obviously, in the corrosion-resistant gray cast iron for the water pump, the content of elements such as nickel, chromium, copper, cobalt and the like is controlled in a proper range, so that the corrosion resistance of the gray cast iron is obviously improved, the requirement of high corrosion resistance of the gray cast iron for the water pump is completely met, and the service life of the water pump is prolonged.
It is to be noted that, in this document, the term "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion, so that an article or an apparatus including a series of elements includes not only those elements but also other elements not explicitly listed or inherent to such article or apparatus.
It should be further noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or alterations do not depart from the spirit of the invention.
Claims (7)
1. The corrosion-resistant gray cast iron for the water pump is characterized by being produced by the following method:
preparing materials and smelting: batching is carried out according to the component requirements of target products, raw material scrap steel, pig iron and return materials are firstly added into an intermediate frequency furnace, ferromanganese, ferrosilicon, ferric sulfide, ferrochrome, copper, cobalt and nickel are then added into the intermediate frequency furnace, and smelting is carried out, wherein the chemical components of batching are controlled as follows according to the mass percentage: 2.6-3.6% of carbon, 1.2-3.0% of silicon, 0.4-1.2% of manganese, 0.02-0.15% of phosphorus, 0.05-0.15% of sulfur, 0.5-2.0% of nickel, 0.5-2.0% of chromium, 0.5-1.5% of copper, 0.5-1.5% of cobalt, 84.4-94.23% of iron and the balance of inevitable impurities;
(II) recarburization treatment: adding a carburant to carry out carburant treatment when molten iron in the intermediate frequency furnace is in a molten state, wherein the temperature of the carburant treatment is controlled to be 1500-1630 ℃;
(III) inoculation treatment: adding an inoculant into the ladle bottom before discharging, and pouring molten iron into the ladle, wherein the temperature of the molten iron is controlled to be 1400-1460 ℃;
(IV) casting: casting the inoculated molten iron into a sand mold, and controlling the casting temperature to be 1360-1410 ℃;
wherein in the step of batching and smelting, the proportion of scrap steel, pig iron and return material is controlled to be 50:25: 25; sampling and analyzing the components of carbon and silicon in the recarburization treatment process; sampling and analyzing components in the inoculation process;
wherein the silicon-carbon ratio in the corrosion-resistant gray cast iron for the water pump is controlled to be 0.57-0.65.
2. The corrosion-resistant gray cast iron for a water pump according to claim 1, wherein the carbon equivalent in the corrosion-resistant gray cast iron for a water pump is controlled to be 3.6% to 4.0% according to the formula CE = ω (C) +1/3[ ω (Si) + ω (P) ], wherein ω (C) is a mass percentage of carbon in the corrosion-resistant gray cast iron for a water pump, ω (Si) is a mass percentage of silicon in the corrosion-resistant gray cast iron for a water pump, and ω (P) is a mass percentage of phosphorus in the corrosion-resistant gray cast iron for a water pump.
3. A method for producing corrosion-resistant gray cast iron for water pumps, which is used for producing corrosion-resistant gray cast iron for water pumps according to claim 1 or 2, characterized by comprising the steps of:
preparing materials and smelting: batching is carried out according to the component requirements of target products, raw material scrap steel, pig iron and return materials are firstly added into an intermediate frequency furnace, ferromanganese, ferrosilicon, iron sulfide, ferrochrome, copper, cobalt and nickel are then added into the intermediate frequency furnace, and smelting is carried out, wherein the batching comprises the following chemical components in percentage by mass: 2.6-3.6% of carbon, 1.2-3.0% of silicon, 0.4-1.2% of manganese, 0.02-0.15% of phosphorus, 0.05-0.15% of sulfur, 0.5-2.0% of nickel, 0.5-2.0% of chromium, 0.5-1.5% of copper, 0.5-1.5% of cobalt, 84.4-94.23% of iron and the balance of inevitable impurities;
(II) recarburization treatment: when molten iron in the intermediate frequency furnace is in a molten state, adding a carburant for carburant treatment, wherein the temperature of the carburant treatment is controlled to be 1500-1630 ℃;
(III) inoculation treatment: adding an inoculant into the ladle bottom before discharging, and pouring molten iron into the ladle, wherein the temperature of the molten iron is controlled to be 1400-1460 ℃;
(IV) casting: casting the inoculated molten iron into a sand mold, and controlling the casting temperature to be 1360-1410 ℃;
wherein in the step of batching and smelting, the proportion of scrap steel, pig iron and return material is controlled to be 50:25: 25;
wherein, the components of carbon and silicon are sampled and analyzed in the recarburization treatment process;
wherein, the components are sampled and analyzed in the inoculation process.
4. The method for producing a corrosion-resistant gray cast iron for a water pump according to claim 3, wherein the temperature of the carburization in the carburization step is controlled to 1610 ℃, the temperature of the molten iron in the inoculation step is controlled to 1420 ℃, and the casting temperature in the casting step is controlled to 1380 ℃.
5. The method for producing a corrosion-resistant gray cast iron for a water pump according to claim 3, wherein the temperature of the carburization in the carburization step is controlled to 1615 ℃, the temperature of the molten iron in the inoculation step is controlled to 1425 ℃, and the casting temperature in the casting step is controlled to 1385 ℃.
6. The method for producing a corrosion-resistant gray cast iron for a water pump according to claim 3, wherein the temperature of the carburization in the carburization step is controlled to 1612 ℃, the temperature of the molten iron in the inoculation step is controlled to 1428 ℃, and the temperature of the casting in the casting step is controlled to 1387 ℃.
7. The method for producing a corrosion-resistant gray cast iron for a water pump according to claim 3, wherein the temperature of the carburization in the carburization step is controlled to 1613 ℃, the temperature of the molten iron in the inoculation step is controlled to 1423 ℃, and the casting temperature in the casting step is controlled to 1378 ℃.
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