CN1175123C - Stainless steel filling material for tower use - Google Patents
Stainless steel filling material for tower use Download PDFInfo
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- CN1175123C CN1175123C CNB011452773A CN01145277A CN1175123C CN 1175123 C CN1175123 C CN 1175123C CN B011452773 A CNB011452773 A CN B011452773A CN 01145277 A CN01145277 A CN 01145277A CN 1175123 C CN1175123 C CN 1175123C
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- stainless steel
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- corrosion
- tower
- filling material
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Abstract
The present invention relates to stainless steel filling materials for a tower, which comprises the following chemical components (wt%): C<=0.10, Cr=15 to 20, Ni=10 to 15, Mo =4 to 8, N<=0.30, S<=0.03, P<=0.03, Mn<=2.0, Si<=1.00 and Fe as the rest. Through a test with an electrochemical method, the corrosion resistance of the materials of the present invention is higher than the corrosion resistance of common stainless steel in a chloride medium, and the materials of the present invention reach the level of high-grade stainless steel. The present invention has good mechanical properties and processability and can be process into bars, pipes, boards, threads or strips and cast parts of various forms.
Description
Technical field
The present invention relates to filler material, relate in particular to a kind of stainless steel filling material for tower use.
Background technology
Tower is the visual plant of unit operations such as rectifying, absorption, extraction, and it is widely used in fields such as petrochemical complex, general chemical and fine chemistry industry.Tower has two kinds of tray column and packing towers.Because packing tower has higher resolution, flux, less pressure fall and the mass-transfer efficiency advantages of higher preferably, is developed and dominate rapidly.Filler is again the main element in the packing tower, and it is vapour-liquid in the tower, the mass transfer of liquid-liquid and the main carrier of heat transfer.The efficient performance of packing tower and other advantage mainly determined with relevant column internals by high efficiency packing, and the high efficiency packing performance are relevant with filler material with work-ing life, and therefore selecting the appropriate filler material for use is the important step of making in the packing tower process.
The filler material kind is a lot, mainly contains pottery, plastics and metal etc.Ceramic packing is used the earliest, but, shortcomings such as space little, resistance big, cracky thicker because of it, and then also cause gas-liquid skewness, channel, short circuit and decrease in efficiency etc., so be confined to use under the high temperature strong corrosion condition; Advantages such as it is anti-corrosion that plastic filler has the low price light weight, easy to process, but also exist non-refractory, surface wettability poor, shortcoming such as mass-transfer efficiency is low is only applicable to wash, cool off the not high occasion of equitemperature; The metallic substance filler has many types again, as carbon steel, stainless steel, titanium alloy etc., and carbon steel low price but not anti-corrosion; Titanium alloy is anti-corrosion but the price height, has a variety ofly in the stainless steel again, as 304,316L, steel grades such as 2205, also exists the contradiction of solidity to corrosion and price, i.e. common stainless steel low price, and solidity to corrosion is poor; The high-class stainless steel solidity to corrosion is good, and price is expensive.
In order to improve the filler material performance, the researchist has also carried out a series of research.For example, Chinese patent CN1035501 proposes a kind of manufacture method of active porcelain ball filler, adds the graphite balling-up with containing 40～95% alumina ceramics mud, and calcining back is immersed and contained Ni, Mo, and in Co or the W liquid tens of hours, calcining more then could after drying; This filler can replace inertia alumina ball or refractory ball, and the effect that has desulfurization, denitrogenation, hydrogenation and guard catalyst not to be poisoned, but also has pottery ball filler inherent shortcoming.Chinese patent CN1158910A proposes the method for whole aluminising of carbon steel ripple packing or multiple permeation, this method is to make good waved plate (net) sheet, be assembled into block earlier, after cleaning, activate, dry the reactivate processing, in aluminium liquid or aluminum alloy melt, ooze attached and diffusion annealing, aluminising that makes like this or multiple permeation carbon steel ripple packing though improved solidity to corrosion, can't satisfy the demand of many media.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of stainless steel filling material for tower use that can bear High Temperature High Pressure, have the superior corrosion resistance energy, be easy to process for the defective that overcomes above-mentioned prior art existence.
Purpose of the present invention can be achieved through the following technical solutions: a kind of stainless steel filling material for tower use, it is characterized in that chemical ingredients (weight %) is: C≤0.10, Cr15～20, Ni10～15, Mo4～8, N≤0.30, S≤0.03, P≤0.03, Mn≤2.0, Si≤1.00, all the other are Fe;
1130 ℃～1180 ℃ of solid solution temperatures, shrend;
Mechanical property:
As cast condition σ
b〉=500, σ
s〉=250MPa, δ
5〉=20%, 〉=20%, a
k〉=200J/cm
2
Forge attitude σ
b〉=650MPa, σ
s〉=300MPa, δ
5〉=30%, 〉=30%, a
k〉=300J/cm
2
Corrosion resistance nature: record pitting potential E by GB GB4334.9-84
b〉=1000mv (S.C.E).
Described material can be processed into bar, tubing, sheet material, silk material or band.
Tower provided by the invention can roll into the thick band less than 0.1mm with Stainless Steel Helices, is processed into various forms of fillers, and as metallurgic orifice corrugated packing, rolling metal perforated plate corrugated filler etc. have industrial utility value.The present invention has easily machining characteristics of the close composition of common stainless steel filler (as the 316L stainless steel) (being close price); High-class stainless steel is arranged (as AL-6X again; 00Cr20Ni25M
o6) corrosion resisting property, and melting manufacturing easily.Show that through test filler material of the present invention is used for estimating running life and reaching 4 years in the fattiness acid rectifying tower, promptly need change in 4～5 months and under similarity condition, only use by the filler that the 316L stainless steel is made.
An appropriate ratio must be arranged between each element in the chemical ingredients of the present invention, could in certain medium, generate the corrosion resisting property that fine and close passive film improves material, could generate austenite structure simultaneously, improve the comprehensive mechanical performance and the processing characteristics of material.Molybdenum content too high (as Mo＞8) for example, then material plasticity descends; Molybdenum content too low (as Mo＜4), then solidity to corrosion reduces.
Corrosion resistance nature of the present invention:
1. anti-pitting attack performance.
By electrochemical method, record the present invention and contrast material 1Cr18Ni9Ti, 316L and AL-6X (00Cr20Ni25M by GB4334.9-84
o6) it is as follows that current potential (Eb) is broken up in the spot corrosion of steel:
Steel grade: 1Cr18Ni9Ti 316L Al-6X the present invention
E
b(mv，S.C.E)：?60 120 1020 1020
Current potential E is broken up in spot corrosion
bHigh more, then the material corrosion resisting property is high more.Find out that thus pitting resistance of the present invention reaches the level of high-class stainless steel AL-6X, far above common stainless steel 1Cr18Ni9Ti, the level of 316L.
2. experiment current potential E～PH schemes in chloride media.
Current potential E～PH figure is an ordinate zou with the current potential exactly, is the electrochemistry phasor of X-coordinate with the pH value, is illustrated under the condition of a certain current potential and pH value the stable states of matter or the equilibrium state of system.Fig. 1 is that the present invention is at 1N Cl
-The experiment current potential E of (t=30 ℃) in the concentration buffer liquid～PH figure.On this figure, express three character zones of metallic corrosion: passivation region A, exempt from erosion district B and corrosion region C.
Passivation region among Fig. 1 and to exempt from erosion district bigger means that the present invention has bigger safe handling scope.Because the transpassivation current potential is very high, indicates that metal has very high corrosion-resistant ability; Simultaneously in PH＞2.2 o'clock, no activation corrosion district.Theoretically, metal is in this passivation with to exempt from erosion district be can the appearance point corrosive.The medium that belongs to this PH and chlorine ion concentration scope is a lot, and as seawater, oilfield sewage and some chemical mediums, so the present invention can be used widely in these media.
3. slit and corrosion resistant performance.
In 3% (weight) NaCl aqueous solution of 30 ℃, artificial slit sample is adopted the acidifying of 1V (S.C.E) constant potential anodic polarization method for pretreating, and stablize in the acidity medium and survey anodic polarization curves in simulation, look it and anode whether occurs and activate the peak and judge whether metal crevice corrosion takes place.Fig. 2 shows material M of the present invention and contrast material 1Cr18Ni9Ti, 316L and AL-6X (00Cr20Ni25M
o6) the activation peak all appears on the anodic polarization curves of the test-results of steel: 1Cr18Ni9Ti, 316L steel, indicating all crevice corrosion can take place, and the activation peak does not appear on the anodic polarization curves of material M of the present invention and AL-6X steel, indicating that crevice corrosion does not take place metal.This test proves that again corrosion resisting property of the present invention is higher than common stainless steel, and reaches the level of high-class stainless steel.
4. intergranular corrosion resistance performance.
Sulfuric acid-copper sulfate method by GB GB4334.5-2000 after the sample solution treatment carries out, and the sample after the test is observed under 10 times of magnifying glasses through 180 ° of bendings, does not find crackle, illustrates intergranular corrosion not occur.
Processing characteristics of the present invention:
The present invention has the performance with the same easy processing of common austenitic stainless steel, can melting in atmosphere induction furnace (or electric arc furnace), and refining temperature must not surpass 1600～1620 ℃, and teeming temperature is controlled at 1500～1540 ℃.Casting fluidity is also suitable with the 1Cr18Ni9Ti steel; When molten steel taps into when solidifying, surperficial conjunctiva is fast, and oxide thickness is thinner, and the cold shut of foundry goods, elephant skin degree do not have Ti-containing steel serious yet.Restrain butt joint crack test method by the east of Sichuan, test-results shows: in all welding joints, comprise weld seam, crackle under 50 times of stereomicroscopes, is not checked out in welding welded bonds and heat affected zone, shows that the present invention has good welding property.
The present invention can be processed into forms such as various bars, tubing, sheet material by forging, hot rolling, cold rolling, can arrive below the 0.1mm as cold rolled sheet thickness, is suitable for making various forms of fillers.
From above-mentioned salient features advantage of the present invention as can be seen: composition is simple and common stainless steel is close; The solidity to corrosion height reaches the high-class stainless steel level; Easily processing has the processing characteristics similar with common austenitic stainless steel; Applied range.
Description of drawings
Fig. 1 is that material of the present invention is at 1N Cl
-The experiment current potential E of (30 ℃) in the concentration buffer liquid～PH figure;
Fig. 2 is the anodic polarization curves in simulating the solution of stablizing acidity for material of the present invention and contrast material.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
Embodiment 1
A kind of stainless steel filling material for tower use, its chemical ingredients (weight %) is: C 0.065, and Si 0.65, and Mn 1.22, and P 0.005, and S 0.03, and Cr 17.95, and Ni 12.00, and Mo 6.35, and N 0.15, and all the other are the steel of Fe.Smelt at the air medium-frequency induction furnace, forge into bar, test after 1150 ℃ of solution treatment, mechanical property is: σ
b: 753MPa, σ
s: 371MPa, δ
5: 44.6%, : 69%, a
k: 320J/cm
2Corrosion resistance nature: at 50 ℃ 10%FeCl
36H
2In the aqueous solution of O, through 72 hours, the general corrosion rate (mm/a) that records the present invention and contrast material is: the present invention 0.24, and AL-6X 1.36, and 316L 25.50.
A kind of stainless steel filling material for tower use, its chemical ingredients (weight %) is: C 0.063, and Cr 18.09, and Ni 12.57, and Mo 4.98, and all the other are the steel of Fe for N 0.18.In the melting of atmosphere medium-frequency induction furnace, pour into steel ingot, forge into blank, through hot rolling, cold rolling one-tenth 0.1mm band, make protruded corrugated sheet packing, be loaded on and produce per year in 5000 tons of lipid acid continuous rectifying towers, main medium is saturated and unsaturated fatty acidss such as C16～C18, these mixed fatty acids by tower at the bottom of or tower middle part move up and down (gas upwards, liquid is downward) through filler, through differing temps and by fractionation.Top temperature is 220 ℃～240 ℃ in the tower.Because mixed fatty acid itself just has certain aggressiveness, sneak into a certain amount of chlorion (CL in the water simultaneously
-), CO
2, O
2Deng, at high temperature have higher aggressiveness, and filler has only 0.1mm thick, and porous, more be subject to heavy corrosion.Used 316L steel filler in the past, using promptly needed the filler that more renews in 4～5 months, and now as use filler material of the present invention, predicted life is the longest to reach 4 years, can save starting material and cost of labor greatly.
Embodiment 3
A kind of oil-field flooding pump impeller made from stainless steel filling material of the present invention, it can be used for the chemical medium of chloride ion-containing.The chemical ingredients of this impeller material (weight %) is C 0.07, and Cr 20.00, and Ni 11.45, and Mo 5.34, and N 0.10, and all the other are Fe.This oil-field flooding pump impeller (model of pump is 6D100-150) cover (totally 12) is loaded on certain oil-field flooding station infusion sewage, and chloride ion content is up to 1.0 * 10 in the sewage
5Mg/L.Be to use 1Cr18Ni9Ti steel impeller in the past, and used the impeller that material of the present invention is made instead, and compared with 1Cr18Ni9Ti steel impeller, the life-span is improved about 8 times, and economic benefit is fairly obvious.
Claims (2)
1. a stainless steel filling material for tower use is characterized in that, chemical ingredients (weight %) is: C≤0.10, and Cr 15～20, and Ni 10～15, and Mo 4.98～8, and N 0.10～0.30, S≤0.03, P≤0.03, Mn≤2.0, Si≤1.00, all the other are Fe;
1130 ℃～1180 ℃ of solid solution temperatures, shrend;
Mechanical property:
As cast condition σ
b〉=500 MPa, σ
s〉=250MPa, δ
5〉=20%, 〉=20%, a
k〉=200J/cm
2
Forge attitude σ
b〉=650MPa, σ
s〉=300MPa, δ
5〉=30%, 〉=30%, a
k〉=300J/cm
2
Corrosion resistance nature: record pitting potential E by GB GB4334.9-84
b〉=1000mv (S.C.E).
2. a kind of stainless steel filling material for tower use according to claim 1 is characterized in that, described material can be processed into bar, tubing, sheet material, silk material or band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011452773A CN1175123C (en) | 2001-12-31 | 2001-12-31 | Stainless steel filling material for tower use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011452773A CN1175123C (en) | 2001-12-31 | 2001-12-31 | Stainless steel filling material for tower use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1429925A CN1429925A (en) | 2003-07-16 |
| CN1175123C true CN1175123C (en) | 2004-11-10 |
Family
ID=4678106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011452773A Expired - Fee Related CN1175123C (en) | 2001-12-31 | 2001-12-31 | Stainless steel filling material for tower use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1175123C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101549278B (en) * | 2009-05-05 | 2011-08-17 | 天津大学 | Foaming nickel regular packing |
| CN101942611B (en) * | 2010-03-22 | 2012-07-25 | 临沭县华盛化工有限公司 | Alloy pump for conveying chlorine-containing mixed acid liquid |
| CN103667998A (en) * | 2013-11-09 | 2014-03-26 | 高月芳 | Stainless steel material |
-
2001
- 2001-12-31 CN CNB011452773A patent/CN1175123C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1429925A (en) | 2003-07-16 |
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Granted publication date: 20041110 Termination date: 20181231 |