CN107574352A - A kind of hardenable austenitic alloy - Google Patents
A kind of hardenable austenitic alloy Download PDFInfo
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- CN107574352A CN107574352A CN201710818696.2A CN201710818696A CN107574352A CN 107574352 A CN107574352 A CN 107574352A CN 201710818696 A CN201710818696 A CN 201710818696A CN 107574352 A CN107574352 A CN 107574352A
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Abstract
The present invention relates to a kind of hardenable austenitic alloy, its constituent are as follows by weight percentage：C ＜ 0.03%, Cr:25 ~ 28%, Ni:33 ~ 37%, Cu:2.5 ~ 3.5%, Si:2 ~ 4%, Mo:4 ~ 6%, N:0.3%, Nb：0.15 ~ 0.2%, rare earth element：0.15%, surplus is Fe and inevitable impurity, is made using chromic carbide iron, nickel plate, molybdenum-iron, copper, ferro-niobium, rare earth and ferrosilicon melting；Corrosion resistance and good of the present invention, the corrosive nature of particularly resistance to sulfuric acid is good, there is high intensity and hardness simultaneously, wear-corrosion resistance is good, economic performance is good, and cost is low, service life length, maintenance cost is low, especially suitable for the metal pump under Waste Sulfuric Acid concentration special operation condition in manufacture production process of titanium pigment.
Description
Technical field
It is not only anti-corrosion but also wear-resisting the present invention relates to a kind of hardenable austenitic alloy, especially suitable for manufacture titanium dioxide life
Metal pump during production under Waste Sulfuric Acid concentration special operation condition, belongs to technical field of alloy material.
Background technology
The corrosion property of sulfuric acid can be divided into oxidisability and reproducibility, depend primarily on temperature and concentration, in general：Concentration
In 0-65% H2SO4, all it is reducing property at all temperatures；H of the concentration in 65-85%2SO4, it is reproducibility at low temperature
Matter, be oxidizing property at high temperature；H of the concentration in 85-100%2SO4, all it is oxidizing property at all temperatures.
Judge that the corrosion property of sulfuric acid is particularly significant for the selection of pump, and the Waste Sulfuric Acid in titanium white production is due to dense
The technique of contracting is different, and its sulfuric acid concentration can be between 20 ~ 70%, and temperature is very high, reach 80 ~ 130 DEG C, therefore, the corruption of Waste Sulfuric Acid
For corrosion matter based on reducing property, the Waste Sulfuric Acid of high concentration has oxidizing property at high temperature；Another feature is contained in spent acid
There are a number of solid phase, such as ferrous sulfate, therefore it is required that the decay resistance that material had both had, what is had again is wear-resisting
Corrosion energy.
High-silicon cast iron of the si content 14.5%, one of selection can be used as, but because it is crisp as glass, to life
Production and application bring larger difficulty, therefore a series of alloy substitution high-silicon cast iron of development abroad.；The 20Cb3 alloys in the U.S. are 80
DEG C can only also less than 60% concentration sulphuric acid be used, be non-serviceable in the sulfuric acid of 60-75% concentration；CD4-Mcu temperature is 80
DEG C, it is also non-serviceable that sulfuric acid year corrosion rate of the concentration in the range of 25-80%, which is more than 1mm/,；Kazakhstan G alloys also can only
Used in 50% H2SO4Following concentration, and the generally austenitic alloy amount of corrosion resistance and good can not harden, the life-span compared with
The reason for short is not that decay resistance is bad, but wear-corrosion resistance is insufficient and result in life-span decline.
Therefore a kind of hardenable austenitic alloy is urgently researched and developed, it is not only anti-corrosion but also wear-resisting, especially suitable for titanium white production
During metal pump material under Waste Sulfuric Acid concentration special operation condition.
The content of the invention
The purpose of the present invention is the defects of being directed in the prior art, to meet that titanium pigment waste acid handles the harsh bar of operating mode
Part, there is provided a kind of hardenable austenitic alloy, it is not only anti-corrosion but also wear-resisting, especially suitable for sulfur waste in manufacture production process of titanium pigment
Metal pump under sour concentration special operation condition.
The present invention is achieved by the following technical solutions：
A kind of hardenable austenitic alloy, wherein, its constituent is as follows by weight percentage：C ＜ 0.03%, Cr:25~
28%, Ni:33 ~ 37%, Cu:2.5 ~ 3.5%, Si:2 ~ 4%, Mo:4 ~ 6 %, N:0.3%, Nb：0.15 ~ 0.2%, rare earth element：
0.15%, surplus is Fe and inevitable impurity.
A kind of above-mentioned hardenable austenitic alloy, wherein, the inevitably impurity includes P and S, by weight percentage
Than meter P and S≤0.03%.
A kind of above-mentioned hardenable austenitic alloy, wherein it is preferred to, by weight percentage：Cr is that 26%, Ni is
35%, Cu 3%, Si 3.5%, Mo 5%, Nb 0.15%.
Above-mentioned a kind of not only corrosion-resistant but also wear-resisting duplex steel alloys, wherein, the weight percent content of the Fe for 21 ~
29%, it is preferable that the weight percent content of the Fe is 27%
A kind of above-mentioned hardenable austenitic alloy, wherein, the austenitic alloy using chromic carbide iron, nickel plate, molybdenum-iron, copper,
Ferro-niobium, rare earth and ferrosilicon melting are made.
A kind of above-mentioned hardenable austenitic alloy, wherein, Mo mass percentage content is 50% in the molybdenum-iron.
A kind of above-mentioned hardenable austenitic alloy, wherein, Nb mass percentage content is 78% in the ferro-niobium.
A kind of above-mentioned hardenable austenitic alloy, wherein, Si mass percentage content is 74% in the ferrosilicon.
A kind of above-mentioned hardenable austenitic alloy, wherein, the austenitic alloy can use investment precision casting technology
For preparing chemical pump product.
Beneficial effects of the present invention are：
1. corrosion resistance and good, the corrosive nature of particularly resistance to sulfuric acid is good；2. wear-corrosion resistance is good, alloy have enough intensity and
Hardness, be advantageous to wear-corrosion resistance；3. processing characteristics is good, specially higher mechanical performance, including σ b tensile strengths, σ s are bent
Take intensity, δ elongations, the Ψ contraction percentages of area, the processing characteristics such as HB hardness, the casting become reconciled, welding and machining；4. economy
Can be good, cost is low, and service life length, maintenance cost is low, at Waste Sulfuric Acid concentration in manufacture production process of titanium pigment
Manage the metal pump under special operation condition.
Brief description of the drawings
Fig. 1 is the corrosion-resistant curve maps such as austenitic alloy of the present invention.
（Curve represents respectively in figure：1st, it is 70% in sulfuric acid concentration of volume percent, when temperature is 60 DEG C, annual corrosion rate is
0.05 millimeter；2nd, it is 60% in phosphoric acid concentration of volume percent, when temperature is 100 DEG C, annual corrosion rate is 0.1 millimeter；3rd, in phosphoric acid
Concentration of volume percent is 60%, and when temperature is 130 DEG C, annual corrosion rate is 1 millimeter）.
Embodiment
The embodiment of the present invention is described further with reference to the accompanying drawings and examples.
The trade mark of the chromic carbide iron is FeCr55c10, manufacturer is Shanghai Ferroally Plant；The trade mark of the molybdenum-iron is
FeMo55-A, manufacturer are Shanghai Ferroally Plant；The copper is tough cathode, Ni mass percentage content in the nickel plate
For 99.99%, the trade mark of the nickel plate is 0#, and manufacturer is Gansu Jinchuan Non-ferrous Metals Company；The trade mark of the nitrided ferro-chromium be FecrN,
Manufacturer is cast metal material Co., Ltd of Wuxi City plum village；The rare earth contains lanthanum, praseodymium, neodymium, promethium, samarium rare earth element
One or more, content of rare earth ＞ 99.5%, purchased from Zhengzhou Sheng Yu chemical products Co., Ltd.
Embodiment 1
A kind of hardenable austenitic alloy, wherein, based on 100kg austenitic alloys, by traditional smelting technology by chromic carbide iron
43kg, nickel plate 35kg and molybdenum-iron 10kg put into 1.5 ~ 2h of melting in intermediate frequency electric smelter, and tapping temperature is 1650 DEG C, is put into before tapping
Melting is carried out in copper 3kg, ferro-niobium 0.3kg, rare earth 0.15kg and ferrosilicon 4kg input smelting furnaces, and austenitic alloy is made；The molybdenum
Mo mass percentage content is 50% in iron, and Nb mass percentage content is 78% in the ferro-niobium, Si in the ferrosilicon
Mass percentage content is 74%.
The constituent of obtained austenitic alloy is as follows by weight percentage：C ＜ 0.03%, Cr:26%, Ni:35%,
Cu:3%, Si:3.5%, Mo:5 %, N:0.3%, Nb：0.2%, rare earth element：0.15%, P and S≤0.03%, surplus Fe.
The compositional selecting reason of austenitic alloy of the present invention is as follows：
C：Although C has the function that to expand austenitic alloy area, when C content is too high, is easily formed and separated out with carbide in crystal boundary,
Crystal boundary chromium content is reduced, therefore alloy corrosion resistance can be decreased obviously, and the plasticity of alloy and toughness reduce, therefore C content
Control is below 0.03%.
Cr：, can be fast in alloy surface in oxide isolation with good anti-local corrosion and homogeneous corrosion ability
It is that corrosive medium can not pass through and undissolved rich Cr oxide-films that speed, which forms one layer of reality, Cr content will more than 25% ability
Reach the effect above, make alloy that there is higher decay resistance, but Cr too high levels, alloy just have the danger for separating out σ phases
Danger, and low-alloyed hot-working character drops, therefore Cr content is controlled 25 ~ 28%.
Ni：With fabulous austenitic matrix stabilizing element, can be dissolved in austenitic matrix stable Ni a large amount of
Cr, Mo etc. there is the element of corrosion-resistant effect, and Ni has splendid corrosion-resistant effect in itself but cost is higher, in order to resistance to useless
Sulfuric acid corrosion reaches this effect, Ni content control 33 ~ 37%, significantly improve with it is corrosion-resistant during the cooperation such as Cr, Mo
Performance, decay resistance during low concentration is in Waste Sulfuric Acid, and casting, welding and mach processing performance can be improved,
Very high plasticity, impact flexibility etc. are respectively provided with normal temperature and low temperature.
Cu：The ability of the S of the resistance to simple substance corrosion of alloy is favorably improved after addition, but when Cu content is more than 3.5%, meeting
Low-alloyed mechanical performance is dropped, therefore Cu content is controlled 2.5 ~ 3.5%.
Si：There is remarkable result to the oxidation resistance for improving Cr, Cr dosage can be saved, reduce cost, but it is excessive
Si addition can cause alloy grain roughening and fragility tendency increase, therefore Si content is controlled 2 ~ 4%.
Nb：The danger corroded in casting and austenitic alloy between its stabilizer and mitigation, and it is used as hardening agent, low niobium contains
The combination of amount and high nitrogen-containing, which adds, result in the stabilized mechanism that alternates, and reach the effect of the precipitation strength in high-temperature use,
Therefore Nb contents are controlled 0.15 ~ 0.2%.
Mo:It is favorably improved the resistance to local corrosion ability of alloy, particularly spot corrosion and crevice corrosion, can be improved pair with Cu
The corrosion resistance of the corrosive mediums such as sulfuric acid, but Mo too high levels, low-alloyed hot-working character, while cost of alloy drop
Raising, the content requirement to Ni accordingly improve, therefore Mo content control is 4 ~ 6 %.
N：Austenitic area can be significantly expanded, there is stabilization of austenite effect and suppress the effect of ferrite and σ phases, together
When can further improve the alloy containing Mo anti-spot corrosion effect, and cost similar with Ni effect is relatively low, but N addition surpasses
0.3% is crossed, sometimes results in significantly reducing for alloy ductility.Therefore N content control is 0.3%.
Rare earth element：The mobility under the resistance to local corrosion performance of alloy, improvement alloy molten can be significantly improved, promotes Cr
Diffusion, heat-resisting alloy high temperature oxidation resistance and high temperature endurance performance are greatly improved, under the conditions of giving full play to material at high temperature
Potential, and the dosage of precious metal is reduced, cost is reduced, improves tensile strength, significantly improves wearability, is worn to corruption
The promotion of erosion is relative to be relaxed, and particularly has strong influence to S pitting corrosion resistance, but can be made when rare earth element is more than 0.15%
Still there is the rare earth compound not being dissolved after alloy treatment, tensile strength, impact flexibility, wearability drastically reduce, therefore by rare earth
The content control of element is 0.15%.
P、S：It is the impurity element of essential association, its hot-working character to alloy, degree of purity produce harmful
Influence, to ensure the corrosion resisting property of this alloy, therefore it is necessary to control P, S content.
By obtained austenitic alloy moulding by casting, the titanium white production in different quality percent concentration and temperature is tested
During corrosion rate under Waste Sulfuric Acid（mm/y）As a result it is as follows：
| Sequence number | H2SO4The concentration of medium（%） | Temperature（℃） | Corrosion rate（mm/y） | Standard requirement |
| 1 | 95~98 | 90 | 0.05 | ＞ 1.25 |
| 2 | 95~98 | 80 | 0 | ＞ 1.25 |
| 3 | 50 | 105 | 0.0660 | 0.625~1.25 |
| 4 | 76 | 85 | 0.2315 | ＞ 1.25 |
| 5 | 45 | 90 | 0.77~0.59 | 0.125~0.625 |
From experimental data, the present invention has good decay resistance and well wear-resisting in each sulfuric acid concentration ranges
It is obvious to lose the impact of performance, alternative import pump is significantly cost-effective, meets the harsh conditions of titanium pigment waste acid processing operating mode.
By obtained austenitic alloy moulding by casting, the year corrosion tested in different sulfuric acid volumetric concentrations and temperature solution
Rate, as a result see accompanying drawing 1, from accompanying drawing, the present invention has good decay resistance.
Embodiment 2
A kind of hardenable austenitic alloy, wherein, the austenitic alloy can use investment precision casting technology to be used to prepare
Chemical pump product, its preparation method are as follows：By manufacturing wax-pattern component, wax-pattern is made in welding mould assembly, cleans wax-pattern, repeats
Repeatedly shell is moulded to obtain in wax-pattern rustproof lacquer and dry wax, add aluminium chloride during hardening, after shell dewaxing, roasting, cast implements 1
Obtained duplex steel alloys, cut cast gate after vibrations shelling and blank is made, dual phase steel is mixed into after the cast gate under cutting is smelting
Alloy reuses, blank mill ingate, sand removal after shot-peening or blasting treatment, then is heat-treated, and heat treatment condition is initial temperature
For 800 DEG C, heating rate is 40 DEG C/h, and annealing temperature is 1000 DEG C, is incubated 15h, can be by casting HRC during as cast condition by heat treatment
Bring up to 45, repair soldering, passivation is polished or machined and produces chemical pump product.
Embodiment 3
A kind of hardenable austenitic alloy, wherein, the step of according to embodiment 2, heat treatment process parameter is changed to starting temperature
Spend for 850 DEG C, heating rate is 50 DEG C/h, and annealing temperature is 1100 DEG C, is incubated 17h, can be by casting during as cast condition by heat treatment
HRC brings up to 46, and chemical pump product is made.
Embodiment 4
A kind of hardenable austenitic alloy, wherein, the step of according to embodiment 2, heat treatment process parameter is changed to starting temperature
Spend for 800 DEG C, heating rate is 60 DEG C/h, and annealing temperature is 1100 DEG C, is incubated 16h, can be by casting during as cast condition by heat treatment
HRC brings up to 46, and chemical pump product is made.
Embodiment 5
A kind of hardenable austenitic alloy, wherein, the step of according to embodiment 2, heat treatment process parameter is changed to starting temperature
Spend for 750 DEG C, heating rate is 50 DEG C/h, and annealing temperature is 1150 DEG C, is incubated 18h, can be by casting during as cast condition by heat treatment
HRC brings up to 48, and chemical pump product is made.
Hardness HB at 3 points of chemical pump product, as a result as follows made from difference testing example 2-3：
| Sequence number | HB1 | HB2 | HB3 |
| Embodiment 2 | 309 | 321 | 321 |
| Embodiment 3 | 345 | 345 | 337 |
| Embodiment 4 | 345 | 345 | 345 |
| Embodiment 5 | 373 | 363 | 363 |
The experience of pump material is selected according to Japanese long-term phosphoric acid by wet process, to two water law flows and half water law containing solid phase particles 35%
Flow, materials for prups have to pass through cure process, under same curing condition, the hardness HB=240, A400U of A725M alloys
Hardness HB=200 of hardness HB=270, the A955 alloy of alloy and CD-4Mcu alloys and the hardness of the present invention after hardening treatment
Above-mentioned alloy is all greatly exceed, is hardness highest austenitic alloy so far.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all cover within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection domain of claims
It is defined.
Claims (8)
1. a kind of hardenable austenitic alloy, it is characterized in that, its constituent is as follows by weight percentage：C ＜ 0.03%,
Cr:25 ~ 28%, Ni:33 ~ 37%, Cu:2.5 ~ 3.5%, Si:2 ~ 4%, Mo:4 ~ 6 %, N:0.3%, Nb：0.15 ~ 0.2%, rare earth member
Element：0.15%, surplus is Fe and inevitable impurity.
2. a kind of hardenable austenitic alloy as claimed in claim 1, it is characterized in that, the inevitably impurity includes
P and S, by weight percentage P and S are ≤0.03%.
3. a kind of hardenable austenitic alloy as claimed in claim 1, it is characterized in that, it is preferable that by weight percentage
Meter：Cr is 26%, Ni 35%, Cu 3%, Si 3.5%, Mo 5%, Nb 0.15%.
4. a kind of hardenable austenitic alloy as claimed in claim 1, it is characterized in that, the weight percent content of the Fe
For 21 ~ 29%, it is preferable that the weight percent content of the Fe is 27%
A kind of hardenable austenitic alloy as claimed in claim 1, it is characterized in that, the austenitic alloy uses micro- carbon
Ferrochrome, nickel plate, molybdenum-iron, copper, ferro-niobium, rare earth and ferrosilicon melting are made.
5. a kind of hardenable austenitic alloy as claimed in claim 5, it is characterized in that, Mo quality percentage in the molybdenum-iron
It is 50% than content.
6. a kind of hardenable austenitic alloy as claimed in claim 5, it is characterized in that, Nb quality percentage in the ferro-niobium
It is 78% than content.
7. a kind of hardenable austenitic alloy as claimed in claim 5, it is characterized in that, Si quality percentage in the ferrosilicon
It is 74% than content.
8. a kind of hardenable austenitic alloy as claimed in claim 1, it is characterized in that, the austenitic alloy can use molten
Mould precision casting process is used to prepare chemical pump product.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109778048A (en) * | 2019-01-30 | 2019-05-21 | 江苏飞跃机泵集团有限公司 | A kind of high rigidity, anti-corrosion Ni-Cr-Fe alloy and preparation method thereof |
| CN113481421A (en) * | 2021-06-24 | 2021-10-08 | 襄阳五二五泵业有限公司 | Chromium-nickel alloy for bushing bush and preparation method thereof |
| CN114717463A (en) * | 2022-04-27 | 2022-07-08 | 江苏轩辕特种材料科技有限公司 | Wear-resistant high-strength alloy material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109778048A (en) * | 2019-01-30 | 2019-05-21 | 江苏飞跃机泵集团有限公司 | A kind of high rigidity, anti-corrosion Ni-Cr-Fe alloy and preparation method thereof |
| CN113481421A (en) * | 2021-06-24 | 2021-10-08 | 襄阳五二五泵业有限公司 | Chromium-nickel alloy for bushing bush and preparation method thereof |
| CN114717463A (en) * | 2022-04-27 | 2022-07-08 | 江苏轩辕特种材料科技有限公司 | Wear-resistant high-strength alloy material and preparation method thereof |
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Application publication date: 20180112 |