CN109554633B - Corrosion-resistant material and preparation method of phosphoric acid slurry pump - Google Patents
Corrosion-resistant material and preparation method of phosphoric acid slurry pump Download PDFInfo
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- CN109554633B CN109554633B CN201811592120.XA CN201811592120A CN109554633B CN 109554633 B CN109554633 B CN 109554633B CN 201811592120 A CN201811592120 A CN 201811592120A CN 109554633 B CN109554633 B CN 109554633B
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
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- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- 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
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- 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
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a corrosion-resistant material, belonging to the technical field of phosphoric acid corrosion-resistant materials, which comprises the following components in percentage by weight: carbon is less than or equal to 0.07; silicon is less than or equal to 2.0; 0.5 to 0.8 percent of manganese; phosphorus is less than or equal to 0.03; sulfur is less than or equal to 0.03; 29.0-31.0 chromium; 2.0-3.0% of nickel; 3.5-4.5% of molybdenum; 1.0-1.5% of copper and the balance of iron. Because the corrosion-resistant material has high Cr content and contains 3.5-4.5% of Mo, the corrosion-resistant material has good resistance to pitting corrosion and stress corrosion in an aqueous solution containing chloride, is superior to 316L, 317L and 0Cr26NiMo2N in the aspect of abrasion resistance, and has good hot workability. The hardness of the alloy can reach 350-400 HB after heat treatment at 1000-1050 ℃ for 2-3 hours. Good welding and machining performance and excellent corrosion resistance in high-temperature phosphoric acid.
Description
Technical Field
The invention relates to the technical field of phosphoric acid corrosion resistant materials, in particular to a corrosion resistant material and a preparation method of a phosphoric acid slurry pump.
Background
In the production of phosphorus chemical industry, the concentration, temperature and medium components of phosphoric acid have great influence on the service life of equipment, particularly the service life of a pump flow-through component in the production of phosphoric acid by a semi-water method and a semi-water-dihydrate method is short, the service life of a pump made of an original material such as 316L, 904L, CD4MCu and the like is less than three months, and the material of the pump flow-through component is required to have corrosion resistance and wear resistance in use.
The corrosion resistance of phosphoric acid to metal increases with increasing temperature, and increases dramatically when the boiling point is reached; the corrosivity of low-concentration phosphoric acid increases with increasing concentration, the corrosivity is greatest when medium concentration is reached, at higher concentrations, the corrosivity decreases with increasing concentration, the acid concentration exceeds 100%, and the corrosivity greatly decreases when the over-phosphoric acid range is reached. But of impurities to phosphoric acidF in acid having a large influence on corrosion resistance-、Cl-And SO4 2-Are corrosion-promoting agents, their presence in phosphoric acid greatly affects the passivation of stainless steel. In the wet-process phosphoric acid production, since F-、Cl-And SO4 2-The corrosion to stainless steel is more serious than that of pure phosphoric acid, and not only metal corrosion and local corrosion but also abrasion are considered when a new material is developed.
Disclosure of Invention
The invention aims to solve the technical problem that the overflow component of the phosphoric acid slurry pump used in the phosphoric acid production process has no corrosion resistance and poor abrasion resistance, so that the service life of the pump is short;
the technical scheme of the invention is as follows: a corrosion resistant material comprising, in weight percent: carbon is less than or equal to 0.07; silicon is less than or equal to 2.0; 0.5 to 0.8 percent of manganese; phosphorus is less than or equal to 0.03; sulfur is less than or equal to 0.03; 29.0-31.0 chromium; 2.0-3.0% of nickel; 3.5-4.5% of molybdenum; 1.0-1.5% of copper and the balance of iron.
The working principle/beneficial effects of the invention are as follows: because the corrosion-resistant material has high Cr content and contains 3.5-4.5% of Mo, the corrosion-resistant material has good resistance to pitting corrosion and stress corrosion in an aqueous solution containing chloride, is superior to 316L, 317L and 0Cr26NiMo2N in the aspect of abrasion resistance, and has good hot workability. The hardness of the alloy can reach 350-400 HB after heat treatment at 1000-1050 ℃ for 2-3 hours. Good welding and machining performance and excellent corrosion resistance in high-temperature phosphoric acid.
Further defined, the weight percentage of the corrosion-resistant material is as follows: 0.056 carbon; 0.62 parts of silicon; 0.78 parts of manganese; 0.025 parts of phosphorus; 0.018 of sulfur; 30.72 parts of chromium; 2.25 parts of nickel; 3.69 parts of molybdenum; copper 1.28, iron 60.561.
The preparation method of the phosphoric acid slurry pump comprises the following steps: mold design, manufacture → molding, core making → molding, core drying → box assembling → melting → pouring → unpacking, shakeout → cutting and casting head → grinding, repair welding → heat treatment → blank inspection → machining → inspection of processed product → assembly → pump performance test → acceptance of finished product.
Further limiting, in the smelting procedure, furnace burden is prepared by adopting micro-carbon ferrochrome, electrolytic nickel, electrolytic copper, ferromolybdenum, ferrosilicon, electrolytic manganese, rare earth alloy and industrial pure ferroalloy materials according to component requirements.
In the molding and core-making process, resin sand is used for molding and making the core.
Drawings
FIG. 1 is a metallographic structure diagram of an etching material at a magnification of 100;
FIG. 2 is a metallographic structure diagram of an etching material at a magnification of 500;
Detailed Description
Control group 1
Preparing the flow passage component of the phosphoric acid slurry pump by adopting 316L as the material of the flow passage component; pump a was obtained.
Control group 2
Preparing the flow passage component of the phosphoric acid slurry pump by adopting CD4MCu as the material of the flow passage component; pump B was obtained.
Example 1
The corrosion-resistant material comprises the following components in percentage by weight: 0.07 parts of carbon; 2.0 of silicon; 0.5 of manganese; 0.03 parts of phosphorus; 0.03 percent of sulfur; 29.0 of chromium; 2.0 parts of nickel; 3.5 parts of molybdenum; copper 1.0, iron 61.87.
The method comprises the following steps: mold design, manufacture → modeling, core making → molding, core drying → box assembling → melting → pouring → unpacking, shakeout → cutting and casting head → grinding, repair welding → heat treatment → blank inspection → machining → inspection of processed product → assembly → pump performance test → acceptance of finished product; in the smelting process, the micro-carbon ferrochrome, electrolytic nickel, electrolytic copper, ferromolybdenum, ferrosilicon, electrolytic manganese, rare earth alloy and industrial pure ferroalloy material are divided into 0.07 of carbon according to mass percentage; 2.0 of silicon; 0.5 of manganese; 0.03 parts of phosphorus; 0.03 percent of sulfur; 29.0 of chromium; 2.0 parts of nickel; 3.5 parts of molybdenum; 1.0 of copper; preparing furnace burden by using iron 61.87, and molding and core making by using resin sand in the molding and core making procedure to obtain a pump C.
Example 2
The corrosion-resistant material comprises the following components in percentage by weight: 0.056 carbon; 0.62 parts of silicon; 0.78 parts of manganese; 0.025 parts of phosphorus; 0.018 of sulfur; 30.72 parts of chromium; 2.25 parts of nickel; 3.69 parts of molybdenum; copper 1.28, iron 60.561.
The method comprises the following steps: mold design, manufacture → modeling, core making → molding, core drying → box assembling → melting → pouring → unpacking, shakeout → cutting and casting head → grinding, repair welding → heat treatment → blank inspection → machining → inspection of processed product → assembly → pump performance test → acceptance of finished product; in the smelting process, the micro-carbon ferrochrome, electrolytic nickel, electrolytic copper, ferromolybdenum, ferrosilicon, electrolytic manganese, rare earth alloy and industrial pure ferroalloy material are composed of 0.056 mass percent of carbon; 0.62 parts of silicon; 0.78 parts of manganese; 0.025 parts of phosphorus; 0.018 of sulfur; 30.72 parts of chromium; 2.25 parts of nickel; 3.69 parts of molybdenum; 1.28 parts of copper; preparing furnace burden from iron 60.561, molding and core-making by resin sand in the molding and core-making process to obtain pump D, and preparing 4 pumps D according to the same method and raw materials.
Example 3
The corrosion-resistant material comprises the following components in percentage by weight: 0.07 parts of carbon; 2.0 of silicon; 0.8 of manganese; 0.03 parts of phosphorus; 0.03 percent of sulfur; 31.0 of chromium; 3.0 parts of nickel; 4.5 of molybdenum; 1.5 parts of copper; iron 57.07.
The method comprises the following steps: mold design, manufacture → modeling, core making → molding, core drying → box assembling → melting → pouring → unpacking, shakeout → cutting and casting head → grinding, repair welding → heat treatment → blank inspection → machining → inspection of processed product → assembly → pump performance test → acceptance of finished product; in the smelting process, the micro-carbon ferrochrome, electrolytic nickel, electrolytic copper, ferromolybdenum, ferrosilicon, electrolytic manganese, rare earth alloy and industrial pure ferroalloy material are divided into 0.07 of carbon according to mass percentage; 2.0 of silicon; 0.8 of manganese; 0.03 parts of phosphorus; 0.03 percent of sulfur; 31.0 of chromium; 3.0 parts of nickel; 4.5 of molybdenum; 1.5 parts of copper; preparing furnace burden from iron 57.07, molding and core-making by resin sand in the molding and core-making process, and preparing 4 pumps E according to the same method and raw materials.
Simultaneously putting a pump A, a pump B and a pump C into a reactor with the mass fraction of 52% H3PO4+800PPmCl-+250PPmF-The temperature of the aqueous solution of (a) was 105 ℃, and the corrosion rates of the respective flow passage components of the pump a, the pump B, and the pump C were measured after one month, as shown in table 1;
4 pumps D are respectively put into H with the mass fraction of 10 percent2SO4+800PPmCl-+250PPmF-An aqueous solution of (a); the mass fraction is 52 percent of H3PO4+800PPmCl-+250PPmF-The mass fraction of the aqueous solution of (1) is 16% H2SO4+500ppmCL-And 45% by mass of P2O5 3-+2％SO42-+0.3％Cl-+1.75％F-The temperature of the aqueous solution of (1) was 105 ℃, and the corrosion rate of the flow passage components of 4 pumps D was measured after one month, and the results are shown in table 2;
the 4 pumps E are respectively put at 85 ℃, 95 ℃, 100 ℃ and 105 ℃ with the mass fraction of 45 percent P2O5 3-+2％SO4 2-+0.3％Cl-+1.75％F-In the aqueous solution of (4) pumps D, the corrosion rate of the flow passage components was measured after one month, and the results are shown in table 3;
TABLE 1
| Pump unit | Corrosion rate/mm/a |
| A | 0.800 |
| B | 0.670 |
| C | 0.030 |
TABLE 2
| Pump unit | Conditions of the test Medium | Corrosion rate/mm/a |
| D | 10％H2SO4+800PPmCl-+250PPmF- | 0.023 |
| D | 52％H3PO4+800PPmCl-+250PPmF- | 0.017 |
| D | 16％H2SO4+500ppmCL- | 0.046 |
| D | 45％P2O5 3-+2％SO42-+0.3％Cl-+1.75％F- | 0.008 |
TABLE 3
| Pump unit | Test temperature C | Corrosion rate/mm/a |
| E | 85℃ | 0.001 |
| E | 95℃ | 0.003 |
| |
100℃ | 0.005 |
| E | 105℃ | 0.008 |
In summary, as can be seen from table 1, the corrosion-resistant material in the present application is used as the phosphoric acid material to make the material of the flow passage component of the pump have a corrosion rate significantly lower than that of the flow passage component made of 316L and CD4MCu, and the service life of the flow passage component made of 316L and CD4MCu can be prolonged to 6 months from three months, so that the production cost is significantly saved, and the economic benefit is improved.
As can be seen from Table 2, the content of H is 10%2SO4+800PPmCl-+250PPmF-、52％H3PO4+800PPmCl-+250PPmF-、16％H2SO4+500ppmCL-And 45% P2O5 3-+2％SO42-+0.3％Cl-+1.75％F-In addition, the corrosion rate of the corrosion-resistant material is greatly reduced, so that the corrosion resistance of the flow passage component is prolonged, and the service life of the phosphoric acid pump is prolonged.
As can be seen from Table 3, at different temperatures, and with the increase of the temperature, the corrosion rate of the corrosion-resistant material is not obviously increased, and the corrosion rate is low, so that the corrosion-resistant material has good corrosion resistance, and the service life of the phosphoric acid pump is prolonged.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A corrosion resistant material for use in phosphoric acid slurry pumps, the corrosion resistant material comprising, in weight percent: carbon is less than or equal to 0.07; silicon is less than or equal to 2.0; 0.5 to 0.8 percent of manganese; phosphorus is less than or equal to 0.03; sulfur is less than or equal to 0.03; 29.0-31.0 chromium; 2.0-3.0% of nickel; 3.5-4.5% of molybdenum; 1.0-1.5% of copper and the balance of iron;
the slurry pump prepared from the corrosion-resistant material has excellent corrosion resistance: putting the slurry pump into the slurry pump with the mass fraction of 52% H3PO4+800PPm Cl-+250PPm F-In the aqueous solution of (1), under the condition of 105 ℃, the corrosion rate is lower than 0.03 mm/a after one month;
putting the slurry pump into a reactor with the mass fraction of 10% H2SO4+800PPmCl-+250PPmF-In the aqueous solution of (1), the corrosion rate is detected to be 0.023mm/a after one month under the condition that the temperature is 105 ℃;
putting the slurry pump into the slurry pump with the mass fraction of 16% H2SO4+500PPm Cl-In the aqueous solution of (1), the corrosion rate is 0.046mm/a after one month under the condition of 105 ℃;
putting the slurry pump into PO with the mass fraction of 45%4 3-+2％SO4 2-+0.3％Cl-+1.75％F-The corrosion rate of the aqueous solution of (1) after one month at a temperature of 105 ℃ was 0.008 mm/a.
2. The corrosion-resistant material for phosphoric acid slurry pumps as claimed in claim 1, wherein the corrosion-resistant material comprises, in weight percent: 0.056 carbon; 0.62 parts of silicon; 0.87 parts of manganese; 0.025 parts of phosphorus; 0.018 of sulfur; 30.72 parts of chromium; 2.25 parts of nickel; 3.69 parts of molybdenum; 1.28 parts of copper; iron 60.471.
3. A method of making a phosphoric acid slurry pump using the corrosion resistant material for a phosphoric acid slurry pump according to any one of claims 1 to 2, comprising the steps of: mold design, manufacture → molding, core making → molding, core drying → box assembling → melting → pouring → unpacking, shakeout → cutting and casting head → grinding, repair welding → heat treatment → blank inspection → machining → inspection of processed product → assembly → pump performance test → acceptance of finished product.
4. The method for preparing the phosphoric acid slurry pump by using the corrosion-resistant material for the phosphoric acid slurry pump according to claim 3, wherein in the smelting process, furnace burden is prepared by adopting micro-carbon ferrochrome, electrolytic nickel, electrolytic copper, ferromolybdenum, ferrosilicon, electrolytic manganese and industrial pure ferroalloy materials according to the component requirements.
5. The method for preparing a phosphoric acid slurry pump from a corrosion-resistant material for a phosphoric acid slurry pump according to claim 3, wherein in the molding and core-making process, the resin sand is used for molding and making the core.
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2616599A1 (en) * | 1976-04-13 | 1977-10-27 | Mannesmann Ag | USE OF A HIGH-ALLOY STEEL TO MANUFACTURE HIGH-STRENGTH, AGAINST SOUR GAS CORROSION RESISTANT |
| CN1153224A (en) * | 1995-12-26 | 1997-07-02 | 中国科学院金属腐蚀与防护研究所 | Casting of wear-resistant corrosion-proof alloy |
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| JP2013014796A (en) * | 2011-07-01 | 2013-01-24 | Jfe Steel Corp | Stainless steel for polymer electrolyte fuel cell separator, method for producing the same, and polymer fuel electrolyte cell separator |
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