CN107541662A - A kind of corrosion resistant ferritic stainless steel alloy material and preparation method thereof - Google Patents
A kind of corrosion resistant ferritic stainless steel alloy material and preparation method thereof Download PDFInfo
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- CN107541662A CN107541662A CN201710902727.2A CN201710902727A CN107541662A CN 107541662 A CN107541662 A CN 107541662A CN 201710902727 A CN201710902727 A CN 201710902727A CN 107541662 A CN107541662 A CN 107541662A
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Abstract
The present invention provides a kind of corrosion resistant ferritic stainless steel alloy material and preparation method thereof, and the mass percent of the alloy material ingredient is：C 0.02%, S 0.01%, P 0.02%, Si 0.5%, Mn 0.5%, Cr 26.0 31.0%, Mo 2.0 3.0%, W 0.1 0.5%, Cu 0.3 1.0%, Al 0.1 1.0%, Nb 0.1 0.2%, Ti 0.1 0.2%, N 0.02%, mischmetal：0.01 0.1%, surplus Fe, its preparation method includes：Smelting ingot casting or ingot formation hot rolling hot-roll annealing pickling and cold-rolling after annealing pickling.
Description
Technical field
The invention belongs to stainless steel alloy material technical field, and in particular to a kind of Gao Ge, high molybdenum high intensity and corrosion-resistant
Ferritic stainless steel and preparation method thereof.
Background technology
Ferritic stainless steel is one kind in stainless steel family, and this kind of steel typically without nickel or few nickel, has body-centered cubic brilliant
Body structure, with its cold formability is good, good in oxidation resistance and resistance to spot corrosion, resistance to chloride stress corrosion is excellent the features such as, in automobile work
The fields such as industry, household electric appliances, building trade and energy environment protection have broad application prospects.
China's nickel resources are deficienter, and continuous with world market metallic nickel price is risen violently, high-nickel austenite stainless steel
Price is also constantly soaring therewith, thus develop can replace partial austenitic stainless steel there is inexpensive, excellent corrosion resistance and cold
The super ferrite stainless steel of good forming ability turns into the important R＆D direction of current enterprises of producing stainless steel.
Super ferrite stainless steel is a kind of resource-conserving high-performance stainless steel alloy material, and it is mainly characterized by height
Chromium, high molybdenum, no nickel or few nickel, with its preferably resistance to spot corrosion, slit and corrosion resistant performance and the features such as excellent welding performance and generation
For the noble metal alloy material such as part super austenitic stainless steel, titanium-base alloy and copper alloy, the strong oxygen of high temperature is mainly used in
The property the changed corrosive environment steel such as sulfuric acid corrosion resistant and marine drilling platform.
Therefore, to better adapt to the market demand and cost-effective, the present invention have developed a kind of resource-conserving without nickel,
Gao Ge, high molybdenum and the high intensity containing rare earth and anti-corrosion ferritic stainless steel alloy.It can be widely applied to kitchen utensils, high temperature oxygen
Change the field steel such as acidproof equipment and marine drilling platform.
The content of the invention
It is an object of the invention to provide a kind of Gao Ge, high molybdenum high intensity and corrosion resistant ferritic stainless steel and its preparation
Method.
A kind of mass percent of corrosion resistant ferritic stainless steel alloy material ingredient of the present invention is：C
≤ 0.02%, S≤0.01%, P≤0.02%, Si≤0.5%, Mn≤0.5%, Cr 26.0~31.0%, Mo 2.0~
3.0%, W 0.1-0.5%, Cu 0.3-1.0%, Al 0.1-1.0%, Nb 0.1~0.2%, Ti 0.1~0.2%, N≤
0.02%, mischmetal：0.01~0.1%, surplus Fe.
Currently preferred mischmetal is mixed rare earth of lanthanum and cerium, wherein lanthanum account for the Zhi amount Bai Fen Bi of mixed rare earth of lanthanum and cerium≤
41%, cerium accounts for Zhi amount Bai Fen Bi≤50% of mixed rare earth of lanthanum and cerium.
Mixed rare earth of lanthanum and cerium of the present invention also containing praseodymium, neodymium, promethium, samarium rare earth element one or more, it is contained therein
Rare earth element summation accounts for mass percent >=99.5% of mixed rare earth of lanthanum and cerium.
The preparation method of ferritic stainless steel alloy material of the present invention includes：Smelting-ingot casting or ingot formation-heat
Roll-hot-roll annealing pickling-cold rolling after annealing pickling.It is described smelt from vaccum sensitive stove, electric furnace+external refining or converter+
Any of external refining technique, adds mischmetal before tapping is cast, and cast temperature is controlled at 1500-1650 DEG C.Institute
State ingot casting or ingot formation uses hammer cogging or continuous casting and rolling, heating-up temperature is 1000-1200 DEG C, the control of cogging initial forging temperature
At 1050-1200 DEG C, final forging temperature is controlled at 900-1000 DEG C.1000-1150 DEG C of blank heating temperature during the hot rolling, open rolling
Temperature control is at 1000-1100 DEG C, and finishing temperature control is at 850-1000 DEG C.The continuous annealing temperature of the hot-roll annealing pickling
Spend for 900-1050 DEG C, be incubated 1-15 minutes, take out water cooling and pickling.Cold roling reduction is in the cold rolling after annealing pickling
55%-70%, it is 850-1000 DEG C to roll after annealing temperature, air cooling after being incubated 1-5 minutes, pickling after air cooling, can be obtained after pickling
Obtain Gao Ge, high molybdenum high intensity and corrosion resistant ferritic stainless steel of the present invention.
To reach above-mentioned purpose, each main alloy element composition of the present invention and its mechanism are as follows：
Chromium is ferrite former and indispensable unique alloying element with industrial application value, and it is easily blunt
Change element, mainly by making stainless steel surfaces form the oxide passivation film of chrome green, make the dissolving on the surface of stainless steel
Speed is reduced to improve corrosion resisting property.In Oxidant, chromium can quickly generate Cr on the surface of stainless steel2O3Passivating film, rise
To anti-corrosion effect, and with the raising of chromium content, corrosion rate of the stainless steel in oxide isolation can drastically reduce, and high chromium can show
Write the corrosion resisting property for improving ferritic stainless steel in Oxidant.
Molybdenum is the important element that chromium is only second in ferritic stainless steel.Molybdenum is added to ferrite stainless steel part, can significantly be carried
Gao Gang resistance to spot corrosion and slit and corrosion resistant performance.
For tungsten as the effect of molybdenum, the corrosion resisting property of steel can be significantly improved by adding in ferritic stainless steel.In addition, tungsten and molybdenum
Collective effect can also reduce the formation speed of secondary-precipitated phase, and the plasticity and corrosion resistance for making steel are increased.
Copper is very weak austenite former, but the addition of a small amount of copper is not produced to the institutional framework of ferritic stainless steel
Raw significant impact.The addition of copper can effectively improve the corrosion resistance of steel, especially corrosion resistance to sulfuric acid, copper in ferritic stainless steel
The cold formability and anti-microbial property of steel can also be improved.
Aluminium is added in steel usually as a kind of strong deoxidier, but appropriate aluminium is in addition to the matrix for being solid-solution in steel, moreover it is possible to chromium
Together Al is formed on the surface of steel2O3And Cr2O3Passivating film, the antioxygenic property and corrosion resistant of significantly very high ferritic stainless steel
Corrosion energy.
As ferrite former, they can be combined the stable Nb of generation with C, N in ferritic stainless steel for niobium and titanium
With Ti carbonitride, so as to suppress the C of chromium in steel, the formation of N compounds, the intergranular corrosion resistance performance of stainless steel, and energy are improved
The crystal grain of fining ferrite stainless steel, improve the toughness and mouldability of steel.
In addition, the still another feature of the present invention is to add mixed rare earth of lanthanum and cerium element, they are surface active elements, in steel
Cleaning molten steel, thinning solidification structure, rotten field trash can not only be played a part of, moreover it is possible to play solution strengthening effect；It is in addition, solid
The rare earth being dissolved in steel is easier to be enriched in crystal boundary, can improve grain-boundary strength and anti intercrystalline corrosion ability.
The high chromium content ferrite stainless steel alloy of the present invention, no nickel and using the compound of the alloying element such as chromium, molybdenum, tungsten and rare earth
Act on and with titanium and niobium Stable Carbon, nitride, make the ferritic stainless steel that there is excellent corrosion resisting property in high-temperature concentrated sulfuric acid,
Its other mechanical property is also preferable.Its cost of alloy is far below SUS316L and 904L austenitic stainless steels, the ferritic stainless steel
Pitting potential in more than 1050mv, spot corrosion index more than 34, more than tensile strength 560MPa, elongation percentage more than 31%, can use
In manufacturing the equipment such as pump, valve and pipeline in sulfuric acid acid making system flow.Therefore, if substituting SUS316L and 904L etc. with it
Austenitic stainless steel, cost of alloy can be greatly reduced, improve alloy life, have to development resource conservation-minded society very important
Meaning.
Brief description of the drawings
The influence curve that Alloy At Room Temperature tensile property described in Fig. 1 embodiment of the present invention 1-7 changes with content of rare earth.
Embodiment
The present invention is further elaborated with reference to embodiments, but these embodiments do not form any limit to the present invention
System.
The preparation of the corrosion resistant ferritic stainless steel alloy materials of embodiment 1-7：According to set by the present invention chemistry into
Divide scope, 7 stove steel have been smelted in vaccum sensitive stove, its composition is shown in Table 1.
Specific preparation method is as follows：Smelting-ingot casting or ingot formation-hot rolling-hot-roll annealing pickling-cold rolling after annealing acid
Wash,
(1) smelt and select vacuum induction furnace technology, mixed rare earth of lanthanum and cerium is added before tapping is cast, cast temperature control exists
1500-1650℃；
(2) ingot casting or ingot formation use hammer cogging, and heating-up temperature is 1000-1200 DEG C, the control of cogging initial forging temperature
At 1050-1200 DEG C, final forging temperature is controlled at 900-1000 DEG C；
(3) 1000-1150 DEG C of blank heating temperature during hot rolling, start rolling temperature control is at 1000-1100 DEG C, finishing temperature control
System is at 850-1000 DEG C；
(4) the continuous annealing temperature of hot-roll annealing pickling is 900-1050 DEG C, is incubated 1-15 minutes, takes out water cooling and acid
Wash；
(5) cold roling reduction is 55%-70% in the pickling of cold rolling after annealing, rolls after annealing temperature for 850-1000 DEG C, protects
Air cooling after warm 1-5 minutes, pickling after air cooling, obtain final Gao Ge, high molybdenum high intensity and corrosion resistant ferritic stainless steel and close
Golden material.
The corrosion resisting property and mechanical property sample of alloy of the present invention are horizontal directly from the sheet material after hot-roll annealing pickling
Sampling, the test performance after 1050 DEG C × 30min water cooling solution treatment.
Comparative example 1-3：For ease of contrast, also SUS316L, OCr have been smelted simultaneously18Ni12Mo2Ti and 904L austenite stainless
Firm number of difference of three kinds of steel, and comparative example 1,2,3 is labeled as successively.Contrast test is being smelted with embodiment identical, forged, heat
Carried out under the conditions of processing and corrosion resistance test etc..
Test example：The influence curve that the room temperature tensile properties of alloy made from embodiment 1-7 change with content of rare earth, is shown in figure
1.To alloy made from above-described embodiment 1-7 and comparative example the 1-3 chemical composition of firm number (its rare earth elements is represented with RE),
Corrosion resisting property and room-temperature mechanical property are tested, and as a result see the table below：
Alloy and comparative example 1-3 grade of steel chemical composition made from the embodiment 1-7 of table 1 compare (wt%)
Preferably feasible embodiment of the invention is the foregoing is only, not thereby limits to the interest field of the present invention,
All equivalence changes made with present specification, it is both contained within the interest field of the present invention.
Alloy and comparative example 1-3 grade of steel are in 30 DEG C of 3.5% (wt.%) NaCl solution made from the embodiment 1-7 of table 2
Pitting corrosion
The 98% dense H at different temperatures of alloy and comparative example 1-3 grade of steel made from the embodiment 1-7 of table 32SO4In it is uniform
Corrosion rate (mm/a)
The room-temperature mechanical property of alloy and comparative example 1-3 grade of steel made from the embodiment 1-7 of table 4
Claims (10)
- A kind of 1. corrosion resistant ferritic stainless steel alloy material, it is characterised in that the quality hundred of the alloy material ingredient Point ratio is：C≤0.02%, S≤0.01%, P≤0.02%, Si≤0.5%, Mn≤0.5%, Cr 26.0~31.0%, Mo 2.0~3.0%, W 0.1-0.5%, Cu 0.3-1.0%, Al 0.1-1.0%, Nb 0.1~0.2%, Ti 0.1~0.2%, N≤0.02%, mischmetal：0.01~0.1%, surplus Fe.
- 2. ferritic stainless steel alloy material according to claim 1, it is characterised in that the mischmetal is that lanthanum cerium mixes Close rare earth.
- 3. ferritic stainless steel alloy material according to claim 1, it is characterised in that the mischmetal is that lanthanum cerium mixes Close rare earth, wherein lanthanum accounts for Zhi amount Bai Fen Bi≤41% of mixed rare earth of lanthanum and cerium, cerium account for the Zhi amount Bai Fen Bi of mixed rare earth of lanthanum and cerium≤ 50%.
- 4. ferritic stainless steel alloy material according to claim 3, it is characterised in that the mixed rare earth of lanthanum and cerium also contains There are praseodymium, neodymium, promethium, the one or more of samarium rare earth element, rare earth element summation contained therein accounts for the quality hundred of mixed rare earth of lanthanum and cerium Divide ratio >=99.5%.
- 5. the preparation method of the ferritic stainless steel alloy material according to claim any one of 1-4, it is characterised in that institute Stating preparation method includes：Smelting-ingot casting or ingot formation-hot rolling-hot-roll annealing pickling-cold rolling after annealing pickling.
- 6. the preparation method of ferritic stainless steel alloy material according to claim 5, it is characterised in that described to smelt choosing With any of vaccum sensitive stove, electric furnace+external refining or converter+external refining technique, mixing is added before tapping is cast Rare earth, cast temperature are controlled at 1500-1650 DEG C.
- 7. the preparation method of ferritic stainless steel alloy material according to claim 6, it is characterised in that the ingot casting or Ingot formation uses hammer cogging or continuous casting and rolling, and heating-up temperature is 1000-1200 DEG C, and cogging initial forging temperature is controlled in 1050- 1200 DEG C, final forging temperature is controlled at 900-1000 DEG C.
- 8. the preparation method of ferritic stainless steel alloy material according to claim 7, it is characterised in that during the hot rolling 1000-1150 DEG C of blank heating temperature, start rolling temperature are controlled at 1000-1100 DEG C, and finishing temperature control is at 850-1000 DEG C.
- 9. the preparation method of ferritic stainless steel alloy material according to claim 8, it is characterised in that after the hot rolling The continuous annealing temperature of annealing and pickling is 900-1050 DEG C, is incubated 1-15 minutes, takes out water cooling and pickling.
- 10. the preparation method of ferritic stainless steel alloy material according to claim 9, it is characterised in that institute's cold rolling retreats Cold roling reduction is 55%-70% in fiery pickling, rolls after annealing temperature for 850-1000 DEG C, air cooling after being incubated 1-5 minutes, air cooling Pickling afterwards.
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Cited By (6)
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| CN108220783A (en) * | 2018-01-31 | 2018-06-29 | 江苏理工学院 | A kind of austenite heat-resistance stainless steel and its manufacturing method |
| CN108342644A (en) * | 2018-01-31 | 2018-07-31 | 江苏理工学院 | A kind of ultra supercritical coal-fired unit austenitic stainless steel and its preparation process |
| CN108342659A (en) * | 2018-01-31 | 2018-07-31 | 江苏理工学院 | A kind of Economic corrosion-resistant ferritic stainless steel and its manufacturing process |
| CN108441767A (en) * | 2018-04-18 | 2018-08-24 | 江苏理工学院 | A kind of thermal power generation ferritic heat-resistant steel and its preparation process |
| CN109321845A (en) * | 2018-12-03 | 2019-02-12 | 常熟理工学院 | A kind of ferritic stainless steel and preparation method thereof meeting food-grade examination criteria |
| CN114318112A (en) * | 2021-12-31 | 2022-04-12 | 江阴华新特殊合金材料有限公司 | Soft magnetic ferrite stainless steel straight bar for engine oil pump and preparation method thereof |
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| CN108342659A (en) * | 2018-01-31 | 2018-07-31 | 江苏理工学院 | A kind of Economic corrosion-resistant ferritic stainless steel and its manufacturing process |
| CN108441767A (en) * | 2018-04-18 | 2018-08-24 | 江苏理工学院 | A kind of thermal power generation ferritic heat-resistant steel and its preparation process |
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| CN114318112A (en) * | 2021-12-31 | 2022-04-12 | 江阴华新特殊合金材料有限公司 | Soft magnetic ferrite stainless steel straight bar for engine oil pump and preparation method thereof |
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