CN114769509A - High-chromium acid-resistant cast iron material, preparation method and application thereof - Google Patents
High-chromium acid-resistant cast iron material, preparation method and application thereof Download PDFInfo
- Publication number
- CN114769509A CN114769509A CN202210320310.6A CN202210320310A CN114769509A CN 114769509 A CN114769509 A CN 114769509A CN 202210320310 A CN202210320310 A CN 202210320310A CN 114769509 A CN114769509 A CN 114769509A
- Authority
- CN
- China
- Prior art keywords
- mass
- casting
- cast iron
- temperature
- iron material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/06—Cast-iron alloys containing chromium
- C22C37/08—Cast-iron alloys containing chromium with nickel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/08—Manufacture of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D5/00—Heat treatments of cast-iron
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a high-chromium acid-resistant cast iron material which comprises the following chemical components in percentage by mass: c: 1.0-3.0; cr: 35-45 parts of; si: 1.0-2.0; mn: less than or equal to 1.0; ni: 3.0-7.0; mo: 1.0-3.0; cu: 1.0 to 3.0 percent, and the balance of Fe. The invention also relates to a preparation method of the high-chromium acid-resistant cast iron material, and relates to application of smelting, pouring, heat treatment and stable production of the flow passage component of the slurry pump. Compared with austenitic stainless steel materials 06Cr17Ni12Mo2(316) and 06Cr19Ni10(304), the corrosion resistance and the wearability of the stainless steel are greatly improved in an oxidizing acid solution containing particles through certain process treatment.
Description
Technical Field
The invention relates to the technical field of cast iron materials, in particular to a high-chromium acid-resistant cast iron material, a preparation method and application thereof to a slurry pump.
Background
The slurry pump is widely applied to a plurality of fields of mines, power plants, dredging, metallurgy, chemical engineering, building materials, petroleum and the like, is used for conveying materials, has the functions of scouring, corrosion, impact and the like of media on flow passage components (impellers, volutes and guard plates), is a conventional consumable product, and has the service life directly restricting the production efficiency and the yield of production units. Hydrometallurgy is a scientific technology for dissolving valuable metal components in ores, concentrates, calcine and other materials in a solution or separating out the valuable metal components in a new solid phase by using a leaching agent to separate, enrich and extract metals, usually, sulfuric acid with relatively low price is used and is influenced by corrosion, a slag slurry pump in the hydrometallurgy industry is usually made of plastic stainless steel, and the slag slurry pump is poor in wear resistance and frequent in part replacement, so that the production efficiency of an enterprise is severely restricted, the maintenance cost is increased, and the bottleneck restricting the industry development is achieved.
Chinese patent CN110079725A discloses an ultra-high wear-resistant hypereutectic high-chromium cast iron material, a preparation method and application thereof, and the ultra-high wear-resistant hypereutectic high-chromium cast iron material comprises the following chemical components in percentage by mass: c: 4.0-5.0; cr: 25-35; si: 0.5-1.0; mn: 1.5-2.5; ni: less than or equal to 1; mo: 2-4; the balance being Fe. The invention also relates to a preparation method of the ultra-high wear-resistant hypereutectic high-chromium cast iron material, and relates to a smelting process and application of the overflow component of a slurry pump in stable production. Compared with BTMCr26 and Cr15Mo3 materials, the ultra-high wear-resistant hypereutectic high-chromium cast iron material disclosed by the invention is high in carbon content and chromium content and carbide number, and can effectively improve the wear resistance of the material. But the toughness is poor.
Chinese patent CN107502814A discloses a process for preparing a high-nickel cast iron-high-chromium cast iron dual-material casting, and relates to the technical field of wear-resistant cast iron preparation. The invention comprises high nickel cast iron; the high-nickel cast iron comprises the following components in percentage by weight: c: 4.45%, Ni: 19.7%, W: 2.2%, Cr: 6.85%, Mn: 0.46%, Si: 0.92%, Ti: 0.16%, P < 0.018%, S < 0.014%, B: 0.021%, Cu: 0.39%, Mo: 0.35%, V: 0.15%, Re: 0.08%, Nb: 0.11%, and the balance of Fe. According to the invention, the content ratio of carbon and nickel in the cast iron is adjusted, the content ratio of carbon and chromium is adjusted, and the cast formed by adopting the process of the high-nickel cast iron-high-chromium cast iron dual-material cast can meet the structural characteristics of the high-nickel cast iron and the high-chromium cast iron at the same time, reduce the deformation and crack tendency, adjust the structure and eliminate the structure defects. But are relatively less resistant to wear and corrosion.
Disclosure of Invention
The invention aims to provide a high-chromium acid-resistant cast iron material, a preparation method and application thereof in a slurry pump in the hydrometallurgy industry.
The technical scheme of the invention is as follows:
the high-chromium acid-resistant cast iron material is characterized by comprising the following chemical components in percentage by mass: c: 1.0-3.0; cr: 35-45 parts of; si: 1.0-2.0; mn: less than or equal to 1.0; ni: 3.0-6.0; mo: 1.0-3.0; cu: 1.0-2.5, and the balance of Fe.
Preferably, the paint comprises the following chemical components in percentage by mass: c: 1.5-2.5; cr: 37-40; si: 1.2-1.8; mn: 0.5-1.0; ni: 4.0-6.0; mo: 1.0-2.0; cu: 1.0 to 1.8, and the balance of Fe.
Preferably, the paint comprises the following chemical components in percentage by mass: c: 2.0 of the total weight of the mixture; cr: 39; si: 1.5; mn: 0.8; ni: 5.5; mo: 1.4; cu: 1.5, and the balance of Fe.
A preparation method of a high-chromium acid-resistant cast iron material comprises the following steps:
1) adding scrap steel, ferrochromium, ferromolybdenum, a nickel plate, copper, ferrosilicon and ferromanganese into the furnace in sequence, and heating and melting.
2) The melting temperature is raised to 1570-1600 ℃, and the components are tested after the melting is completed.
3) The casting temperature of the molten iron is 1420-.
4) Adopting a lost foam casting process: EPS foaming molding, wherein the surface is coated with zirconium-aluminum powder water-based paint, auxiliary casting systems such as a riser head are adhered, the drying is carried out, the whole flask is packaged and molded, precious pearl sand with the granularity of 10-20 meshes is used as molding sand, and a sand box is kept in a negative pressure state in the whole casting process.
5) And cooling the casting to room temperature after shaking the casting box, and performing shoveling, including dead head removing, flash removing and polishing.
6) Heating the casting in heat treatment equipment to 850 ℃, keeping the temperature for 3-4 hours, taking the casting out of a furnace, performing air cooling treatment, keeping the temperature for 4 hours at 650 ℃, and performing tempering treatment.
7) The casting needs to be subjected to heat treatment, the temperature is raised to 850 ℃ according to a set curve, the temperature is kept for 3-4 hours, then the casting is taken out of the furnace for air cooling, then the casting is heated to 650 ℃ according to the curve, the temperature is kept for 4 hours, and tempering is carried out.
Preferably, in the step 1), the mass content of the scrap steel is 25%, the mass content of the ferrochrome is 63.3%, the mass content of the ferromolybdenum is 0.3%, the mass content of the nickel plate is 0.5%, the mass content of the copper is 0.2%, the mass content of the ferrosilicon is 0.1%, and the mass content of the ferromanganese is 0.1%.
Preferably, before the molten iron in the step 3) is poured, one or two rare earth and silicon-aluminum alloy are added into a ladle, the total adding amount of the rare earth and silicon-aluminum alloy is not more than 0.5 percent of the mass of the molten iron in the ladle, and if necessary, a heat-insulating covering agent is added into a riser position after pouring.
Preferably, the vacuum degree of the sand box in the pouring process in the step 4) is not lower than 0.04MPa, the pouring speed is not lower than 1t/min, the pressure maintaining negative pressure of the sand box after pouring is not lower than 0.02MPa, and the time is not lower than 10 minutes.
Preferably, step 5) the castings are cooled in the sand box to 400 and 500 deg.C (typically 8-12 hours after casting) and then the box shaking is initiated.
Preferably, the temperature of the cast in the step 6) is raised in a heat treatment device at the speed of 30-40 ℃ per hour when the furnace temperature is lower than 350 ℃, the temperature of 350-700 ℃ is raised at the speed of 40-60 ℃ per hour, the temperature raising speed in the stage of 700-850 ℃ is not lower than 80 ℃ per hour, and the heat preservation temperature of 4-6 sections is set in the whole temperature raising period.
The application of the high-chromium acid-resistant cast iron material is used in the flow passage component of a slurry pump and other pump parts soaked by slurry.
The room temperature of the invention is 4-37 ℃.
The invention has the beneficial effects that:
the invention provides a high-chromium acid-resistant cast iron material, which contains more than 35% of chromium, can precipitate a large amount of carbides in a matrix and is in net distribution, so that the mechanical property of the material is greatly reduced, and parts such as an impeller of a slurry pump, a volute and the like have complex structures, so that cracks are easily caused by stress concentration in the casting and heat treatment processes, and waste products are further generated. On the basis of ensuring good corrosion resistance and wear resistance of the material, the invention improves the toughness of the material by adding other alloy elements and controlling the casting and heat treatment processes, so that the material is applied to the production and the manufacture of slurry pump parts, has high yield, replaces the traditional plastic and stainless steel materials in the oxidizing acid medium (sulfuric acid, nitric acid and the like) in the hydrometallurgy industry, and obviously prolongs the service life of the slurry pump.
The effective chemical composition design basis and the limited range reason of the high-chromium acid-resistant cast iron material are as follows: an appropriate carbon content is not more than 2% because it is necessary to form a high-hardness carbon compound in consideration of the requirement that the material has a certain wear resistance, but too high a carbon content lowers the corrosion resistance of the material.
The material has extremely high chromium content, the addition of the chromium effectively improves the electrode potential of the iron-based solid solution, prevents electrochemical corrosion of oxidizing acid, simultaneously the chromium can absorb electrons of iron in the material to passivate the iron and prevent corrosion of a matrix, and besides, part of chromium elements form carbides such as (Fe, Cr) with carbon and iron7C3And the wear-resistant steel has extremely high hardness, and can effectively improve the wear resistance of the material.
The nickel can enlarge an austenite phase region, improve the stability of austenite, provide favorable conditions for forming a ferrite-austenite two-phase structure of the material, and simultaneously stabilize the stability of a matrix passivation layer, thereby further improving the corrosion resistance of the material.
Molybdenum is a stable element for the austenite structure, which can improve the matrix hardenability and delay the transformation of austenite to pearlite, and other than molybdenum, it forms a high-hardness molybdenum carbide (Mo) with carbon2C) The stability of carbide is improved, and the intergranular corrosion resistance of the material is improved.
The combined action of copper and molybdenum can obviously improve the oxidation-resistant acid medium corrosion resistance of the material and is beneficial to structure refinement, but excessive copper can be precipitated and aggregated, and the strength of the material is reduced.
S, P are harmful elements in the material, and the content should be reduced as much as possible.
The rare earth element is one or more lanthanide elements, and is added as a modifier, so that crystal grains can be refined, gas in molten iron can be removed, the viscosity and the fluidity of the molten iron can be improved, non-metallic inclusions can be effectively removed, and the performance of the material can be obviously improved.
The silicon-aluminum alloy is used for removing oxygen in molten iron and reducing defects of material pores and the like.
Detailed Description
And (3) using a lost foam casting process, forming a pattern by EPS foaming, coating the surface of the pattern for 3 times by using zirconium-aluminum powder water-based paint, drying after adhering an auxiliary pouring system such as a riser and the like, integrally boxing and shakeout, and molding by using baozhu sand with the granularity of 10-20 meshes.
Example 1: 309kg of scrap steel, 600kg of ferrochrome, 22kg of ferromolybdenum, 32kg of nickel plate, 23kg of copper, 5kg of ferrosilicon and 9kg of ferromanganese are sequentially added into a 1-ton intermediate frequency furnace for heating and melting; and detecting components after the molten iron is completely melted at 1600 ℃, adding 5kg of rare earth elements and silicon-aluminum alloy into the casting ladle, pouring into the ladle after the molten iron is completely melted, and pouring into the ladle after the molten iron is completely melted.
When the temperature in the ladle reaches 1480 ℃, casting, wherein the negative pressure in the sand box is 0.045MPa, the casting speed is 1.2t/min, the negative pressure in the sand box is kept at 0.025MPa after the casting is finished, and the casting is closed after the negative pressure is kept for 10 minutes.
Example 2: 260kg of scrap steel, 640kg of ferrochrome, 30kg of ferromolybdenum, 40kg of nickel plate, 12kg of copper, 10kg of ferrosilicon and 9kg of ferromanganese are sequentially added into a 1-ton intermediate frequency furnace for heating and melting; and detecting components after the molten iron is completely melted at 1590 ℃, adding 5kg of rare earth elements and silicon-aluminum alloy into the casting ladle, and pouring the molten iron into the ladle after the molten iron is completely melted.
When the temperature in the ladle reaches 1470 ℃, casting, keeping the negative pressure in the sand box at 0.05MPa and the casting speed at 1.2t/min, keeping the negative pressure in the sand box at 0.026MPa after casting, and closing after keeping for 10 minutes.
Example 3: 212kg of scrap steel, 680kg of ferrochrome, 46kg of ferromolybdenum, 48kg of nickel plate, 15kg of copper, 11kg of ferrosilicon and 10kg of ferromanganese are sequentially added into a 1-ton intermediate frequency furnace for heating and melting; and detecting components after the molten iron is completely melted to 1580 ℃, adding the rare earth elements and the silicon-aluminum alloy into the casting ladle with the total addition of 4kg, and pouring the molten iron into the ladle after the molten iron is completely melted.
When the temperature in the ladle reaches 1450 ℃, casting is poured, the negative pressure in the sand box is 0.045MPa, the pouring speed is 1.2t/min, the negative pressure in the sand box is kept at 0.026MPa after the pouring is finished, and the casting is closed after the negative pressure is kept for 10 minutes.
Example 4: 150kg of scrap steel, 730kg of ferrochrome, 26kg of ferromolybdenum, 53kg of nickel plate, 18kg of copper, 13kg of ferrosilicon and 10kg of ferromanganese are sequentially added into a 1-ton intermediate frequency furnace for heating and melting; and (3) detecting components after the molten iron is completely melted to 1580 ℃, adding the rare earth elements and the silicon-aluminum alloy into the casting ladle, wherein the total adding amount is 3kg, and pouring the molten iron into the ladle after the molten iron is completely melted.
When the temperature in the ladle reaches 1430 ℃, casting is poured, the negative pressure in the sand box is 0.043MPa, the pouring speed is 1.2t/min, the negative pressure in the sand box is kept at 0.024MPa after the pouring is finished, and the sand box is closed after the negative pressure is kept for 10 minutes.
After the castings of the above four examples are cast for 12 hours (about 400 ℃), the boxes are shaken, air-cooled to room temperature, and the gating system and risers are removed and polished.
After polishing the casting blank, heating the casting blank in a heat treatment device according to a set curve, heating the casting blank to 40 ℃ per hour from room temperature to 350 ℃, heating the casting blank to 50 ℃ per hour from 350 ℃ to 700 ℃, heating the casting blank to 100 ℃ per hour from 700 ℃ to 850 ℃, respectively preserving heat for 1 hour at 200 ℃, 350 ℃, 500 ℃ and 700 ℃, finally preserving heat for 4 hours from 850 ℃, discharging the casting blank from a furnace, air cooling, and then immediately carrying out tempering treatment of preserving heat for 4 hours at 650 ℃.
And machining the casting after heat treatment until the required size is designed.
Through the mode, the flow passage component of the slurry pump and other pump parts soaked by the slurry can be stably produced.
The slurry pump flow components of the above examples are shown in table 1 for chemical composition, hardness and impact toughness.
TABLE 1 compositions, hardness and impact toughness of the examples
The metallographic structure of the invention is austenite, ferrite and alloy carbide, the hardness range is HRC42-48, and the impact toughness range is 4.6-6.3J/cm2。
And (3) corrosion test: compared with a corrosion test of 06Cr17Ni12Mo2(316) in the national standard, the invention is processed into uniform sizes of 18mm multiplied by 38mm, and is placed in a 20% sulfuric acid solution at the temperature of 20 ℃ for 185 hours. The material state is as follows: solid solution and tempering. The performance comparisons are shown in table 2:
TABLE 2 Corrosion comparison
Under the same strong acid static corrosion condition, the annual corrosion depth of the material is lower than that of 316 stainless steel materials, the optimum corrosion depth is only 1/2 loss amount, and the strong oxidizing acid corrosion condition in hydrometallurgy has the performance superior to that of the common 316 stainless steel.
Erosion wear test: compared with a corrosion test of 06Cr17Ni12Mo2(316) in the national standard, the invention is processed into a uniform size of 18mm multiplied by 38mm, and a self-made abrasion tester is used for carrying out the test, wherein the medium is a mixed solution of sulfuric acid, sulfate and quartz sand (100 meshes of quartz sand 2kg, 200ml of concentrated sulfuric acid, ammonium sulfate 1kg, manganese sulfate 0.25kg and water 2kg), the temperature is 20 ℃, the rotating speed is 960r/min, and the linear speed is 600 m/min. The material state is as follows: solid solution and tempering. The performance comparisons are shown in table 3:
TABLE 3 annual depth of abrasion of the material
| Material | Annual abrasion depth/mm |
| 06Cr17Ni12Mo2(316) | 60.80 |
| Example 1 | 21.43 |
| Example 2 | 16.37 |
| Example 3 | 17.21 |
| Example 4 | 16.42 |
In the same strong acid abrasion medium, the material of the invention has the annual abrasion depth far lower than that of 316 stainless steel, and has the performance far superior to that of the common 316 stainless steel in the working conditions of particle-containing hydrometallurgy and strong oxidizing acid abrasion, so that the service life of the slurry pump in the industry can be effectively prolonged.
Claims (10)
1. The high-chromium acid-resistant cast iron material is characterized by comprising the following chemical components in percentage by mass: c: 1.0-3.0; cr: 35-45 parts of; si: 1.0-2.0; mn: less than or equal to 1.0; ni: 3.0-6.0; mo: 1.0-3.0; cu: 1.0 to 2.5, and the balance of Fe.
2. The high-chromium acid-resistant cast iron material as claimed in claim 1, wherein the high-chromium acid-resistant cast iron material comprises the following chemical components in percentage by mass: c: 1.5-2.5; cr: 37-40; si: 1.2-1.8; mn: 0.5-1.0; ni: 4.0-6.0; mo: 1.0-2.0; cu: 1.0 to 1.8, and the balance of Fe.
3. The high-chromium acid-resistant cast iron material as claimed in claim 1, wherein the high-chromium acid-resistant cast iron material comprises the following chemical components in percentage by mass: c: 2.0 of the total weight of the mixture; cr: 39; si: 1.5; mn: 0.8; ni: 5.5; mo: 1.4; cu: 1.5, and the balance of Fe.
4. The preparation method of the high-chromium acid-resistant cast iron material of any one of 1 to 3 is characterized by comprising the following steps of:
1) sequentially adding scrap steel, ferrochromium, ferromolybdenum, a nickel plate, copper, ferrosilicon and ferromanganese into a furnace in the charging sequence, and heating and melting;
2) the melting temperature is increased to 1570-1600 ℃, and the components are tested after the materials are completely melted;
3) the pouring temperature of the molten iron is 1420-1480 ℃;
4) adopting a lost foam casting process: EPS foaming molding, wherein the surface is coated with zirconium-aluminum powder water-based paint, the zirconium-aluminum powder water-based paint is adhered to a riser auxiliary pouring system and then dried, the whole is boxed and molded, the molding sand uses baozhu sand with the granularity of 10-20 meshes, and the sand box keeps a negative pressure state in the whole pouring process;
5) after shaking the casting, cooling to room temperature, and performing shoveling, including dead head removing, flash removing and polishing;
6) heating the casting in heat treatment equipment to 850 ℃, keeping the temperature for 3-4 hours, discharging the casting from a furnace, carrying out air cooling treatment, keeping the temperature for 4 hours at 650 ℃, and carrying out tempering treatment.
5. The production method according to claim 4, wherein the scrap steel in step 1) is 25% by mass, the ferrochrome is 63.3% by mass, the ferromolybdenum is 0.3% by mass, the nickel plate is 0.5% by mass, the copper is 0.2% by mass, the ferrosilicon is 0.1% by mass, and the ferromanganese is 0.1% by mass.
6. The preparation method according to claim 4, wherein one or two rare earth and silicon-aluminum alloy are added into the ladle before the molten iron is poured in the step 3), the total addition amount of the rare earth and the silicon-aluminum alloy is not more than 0.5 percent of the mass of the molten iron in the ladle, and a heat-insulating covering agent is added at a riser position after pouring.
7. The preparation method according to claim 4, characterized in that in the step 4), the vacuum degree is controlled to be not lower than 0.04MPa in the casting process, and the casting speed is not lower than 1 t/min; and 4) finishing pouring, wherein the pressure maintaining time is not less than 10min, and the vacuum degree is not less than 0.02 MPa.
8. The method as claimed in claim 4, wherein the step 5) is performed by cooling the casting to 400-500 ℃ for 8-12h and then shaking the box, and cooling the casting to room temperature in air.
9. The preparation method according to claim 4, wherein the temperature of the cast in the step 6) is raised at a rate of 30 to 40 ℃ per hour when the furnace temperature is lower than 350 ℃ in the heat treatment equipment, the temperature of 350 ℃ to 700 ℃ is raised at a rate of 40 to 60 ℃ per hour, the temperature raising rate in the stage of 700 ℃ to 850 ℃ is not lower than 80 ℃ per hour, and the holding temperature in 4 to 6 stages is set during the whole temperature raising period.
10. The application of the high-chromium acid-resistant cast iron material is characterized by being used in a slurry pump flow passage component and a pump part soaked by slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210320310.6A CN114769509A (en) | 2022-03-29 | 2022-03-29 | High-chromium acid-resistant cast iron material, preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210320310.6A CN114769509A (en) | 2022-03-29 | 2022-03-29 | High-chromium acid-resistant cast iron material, preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114769509A true CN114769509A (en) | 2022-07-22 |
Family
ID=82426116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210320310.6A Pending CN114769509A (en) | 2022-03-29 | 2022-03-29 | High-chromium acid-resistant cast iron material, preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114769509A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392349A (en) * | 2008-11-03 | 2009-03-25 | 河南科技大学 | Super high chromium wear and corrosion resistant cast iron and preparation technology thereof |
| CN102330016A (en) * | 2011-09-16 | 2012-01-25 | 昆明市宜良化工设备铸造厂 | Hypoeutectic high-chromium white cast iron and preparation method thereof |
| CN103556042A (en) * | 2013-10-23 | 2014-02-05 | 德州宏森机械有限公司 | Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump |
| CN104762548A (en) * | 2015-03-30 | 2015-07-08 | 山东双轮股份有限公司 | Titanium/nitrogen-codoped wear-resistant corrosion-resistant high-chromium cast iron and preparation method thereof |
| CN109023032A (en) * | 2018-10-22 | 2018-12-18 | 成都永益泵业股份有限公司 | A kind of rich chromium cast iron and preparation method thereof for flow passage component of slurry pump |
| CN110079725A (en) * | 2019-05-21 | 2019-08-02 | 石家庄工业泵厂有限公司 | A kind of super-high wear-resistant hypereutectic high chromium cast iron material, preparation method and applications |
| CN113337776A (en) * | 2021-05-31 | 2021-09-03 | 襄阳五二五泵业有限公司 | High-wear-resistance high-chromium white cast iron for pump and preparation method thereof |
-
2022
- 2022-03-29 CN CN202210320310.6A patent/CN114769509A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101392349A (en) * | 2008-11-03 | 2009-03-25 | 河南科技大学 | Super high chromium wear and corrosion resistant cast iron and preparation technology thereof |
| CN102330016A (en) * | 2011-09-16 | 2012-01-25 | 昆明市宜良化工设备铸造厂 | Hypoeutectic high-chromium white cast iron and preparation method thereof |
| CN103556042A (en) * | 2013-10-23 | 2014-02-05 | 德州宏森机械有限公司 | Casting and thermal treatment technology for high-chromium iron on flow passage component of slurry pump |
| CN104762548A (en) * | 2015-03-30 | 2015-07-08 | 山东双轮股份有限公司 | Titanium/nitrogen-codoped wear-resistant corrosion-resistant high-chromium cast iron and preparation method thereof |
| CN109023032A (en) * | 2018-10-22 | 2018-12-18 | 成都永益泵业股份有限公司 | A kind of rich chromium cast iron and preparation method thereof for flow passage component of slurry pump |
| CN110079725A (en) * | 2019-05-21 | 2019-08-02 | 石家庄工业泵厂有限公司 | A kind of super-high wear-resistant hypereutectic high chromium cast iron material, preparation method and applications |
| CN113337776A (en) * | 2021-05-31 | 2021-09-03 | 襄阳五二五泵业有限公司 | High-wear-resistance high-chromium white cast iron for pump and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 贡海亭: "叶轮用高韧性耐磨材料及工艺研究", 《金属加工（热处理）》, pages 183 - 185 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110079725B (en) | Ultra-high wear-resistant hypereutectic high-chromium cast iron material, and preparation method and application thereof | |
| JP6214674B2 (en) | High hardness low alloy wear resistant steel sheet and method for producing the same | |
| CN103088249B (en) | Abrasion-resistant alloy cast iron material with high hardness for chute lining plate, and preparation method thereof | |
| CN109023119B (en) | Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof | |
| CN110643898B (en) | Wear-resistant corrosion-resistant nonmagnetic alloy material and preparation method thereof | |
| CN109295382B (en) | High-nitrogen wear-resistant corrosion-resistant alloy and preparation method thereof | |
| CN112941406B (en) | Stainless steel for knife and scissors | |
| CN112575261B (en) | Composite modified martensitic alloy cast steel | |
| CN111485164B (en) | Casting method for enhancing wear resistance of low-chromium alloy casting | |
| CN113897541B (en) | High-chromium wear-resistant steel ball and casting process thereof | |
| CN103305772B (en) | A kind of high rigidity slag stock pump pump housing and preparation method thereof | |
| CN110257707B (en) | High-nitrogen duplex stainless steel and preparation method thereof | |
| CN107574352A (en) | A kind of hardenable austenitic alloy | |
| CN114769509A (en) | High-chromium acid-resistant cast iron material, preparation method and application thereof | |
| CN115572905A (en) | 690 MPa-grade tempering-resistant low-temperature quenched and tempered steel and manufacturing method thereof | |
| CN115570103A (en) | Production method for investment casting of low-carbon low-alloy high-strength structural steel | |
| CN110468329B (en) | ZG-SY09MnCrNiMo RE steel and casting preparation method | |
| CN114231851A (en) | Nano carbide reinforced wear-resistant steel and preparation method and application thereof | |
| CN111589535A (en) | Feeding end lining plate for semi-automatic mill of concentrating mill and processing technology thereof | |
| CN111187972A (en) | High-toughness high-hardness alloy and preparation method thereof | |
| CN112831716A (en) | Wear-resistant steel casting process for manufacturing front blade of bucket of underground scraper | |
| CN113584479B (en) | Chute composite lining plate and preparation method thereof | |
| CN116377315A (en) | Hypereutectic wear-resistant cast iron material, preparation method and application thereof | |
| CN107574384B (en) | Wear-resistant alloy steel lining plate and preparation method thereof | |
| CN114032462B (en) | High-strength and high-toughness low-alloy cast steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |