CN103966516A - Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel - Google Patents
Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel Download PDFInfo
- Publication number
- CN103966516A CN103966516A CN201410175185.XA CN201410175185A CN103966516A CN 103966516 A CN103966516 A CN 103966516A CN 201410175185 A CN201410175185 A CN 201410175185A CN 103966516 A CN103966516 A CN 103966516A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- low
- percent
- rolling
- controlled
- 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
Abstract
The invention discloses low-cost stainless steel for a tail gas purification system and a manufacturing method of the low-cost stainless steel. The low-cost stainless steel comprises the following components by weight: 0.004-0.015 percent of C, 0.15-0.50 percent of Si, 0.10-0.60 percent of Mn, 14.5-19.0 percent of Cr, less than or equal to 0.040 percent of P, less than or equal to 0.005 percent of S, 0.004-0.015 percent of N, less than or equal to 0.025 percent of (C+N), 0.01-0.1 percent of V, less than or equal to 0.05 percent of Al, and the balance of Fe and inevitable impurities; in impurity elements, the content of Ni is less than or equal to 0.2 percent, the content of Cu is less than or equal to 0.2 percent, and the content of O is less than or equal to 0.0050 percent; the total content of other impurity elements is smaller than 0.05 percent; the low-cost stainless steel further comprises more than one of Nb and Ti as stabilizing elements. The low-cost stainless steel has urea corrosion resistance equal to SUS304 stainless steel, and meanwhile, the low-cost stainless steel has a ferrite centered structure, thereby having low coefficient of thermal expansion and higher heat conductivity coefficient; the low-cost stainless steel meets the corrosion environment conditions of high temperature of 400-500 DEG C and urea.
Description
Technical field
The present invention relates to stainless steel and manufacture method thereof, particularly low-cost stainless steel and manufacture method for a kind of exhaust gas purification system.
Background technology
In recent years Domestic Automotive Industry develop rapidly, the impact of motor vehicle exhaust environmental pollution is day by day serious, and tail gas clean-up requires to improve constantly, and particularly the emission control of traditional large-tonnage car is attracted great attention.External as Europe, the U.S. and Japan etc. realize commercial car emission control already.Along with the raising of national requirements for environmental protection, the commercial car particularly levels of emissions of heavy-duty car is brought up to state four from current state three.Traditional state's three emission requests, do not need the obnoxious flavour of engine discharge to process as oxynitride etc. general direct outer row.And new emission request is while bringing up to state four from state three, levels of emissions improve single technically, just need in former blowdown system, increase a tail gas clean-up conversion system.This device use temperature is at 400～600 ℃, and by spray urea (concentration is 3%～4%), and urea can be decomposed to form NH under high temperature action
3, as NOx reacts, form N with the toxic and harmful in engine combustion product
2and H
2the pollution-free product of O, reaches the object of environment protection.Hot environment also exists traditional material under the condition of resistance to urea to use austenitic stainless steel as SUS304 (18Cr%-8Ni%).But this stainless steel, owing to containing expensive and scarce resource Ni, has increased the manufacturing cost of component greatly.Meanwhile, this stainless steel is austenitic stainless steel, can be because heating causes the excessive Cracking Failure that causes of welding stress in component welding manufacturing processed.Automobile component run without interruption and also can cause the generation of expanding with heat and contract with cold of component, and the add-on parts in system causes the dimensional change of Stainless Steel Shell as played the meetings such as ceramic liner of cleaning action because expanding with heat and contract with cold, and ceramic liner can stressed fragmentation cause losing efficacy.Therefore need to develop a kind of manufacturing cost relatively low, there is good resistance to urea corrosive nature and low thermal expansivity simultaneously, can avoid the stainless processing characteristics of SUS304 not enough.
The stainless composition of traditional SUS304 is: C≤0.07%, Si≤1.0%, Mn≤2.0%, Cr:17.5-19.5, Ni:8.0-10.5, P≤0.045%, S≤0.015%, N≤0.11%; Yield strength (Mpa) >=230, tensile strength (Mpa) >=540, unit elongation (%) >=45.
By patent retrieval, except adopting AISI304 stainless steel (American Standard in urea manufacture and environment for use, be equivalent to SUS304 stainless steel) outside, retrieve TOHKEMY 2007-113484 and (be equivalent to SUS304,18Cr-8Ni) with JP 2003-301241 (duplex stainless steel 25Cr-6Ni-2Mo-2W), the former is mainly used in the storing unit of urea, and the latter is for the manufacturing installation of urea.Meanwhile, the patent that the patent No. is WO2010/010816A1 discloses stainless material, is also the alternative SUS304 stainless material of storing unit for urea, reduces costs, and maximum operation (service) temperature, at 60 ℃, is not for tail gas clean-up spray decomposing system.Do not retrieve other stainless steels of under above-mentioned Service Environment condition (400-600 ℃, urea spraying purification system).
From above-mentioned Service Environment and the stainless steel patent that retrieves, in order to ensure the corrosion resistance of material, main alloy element Cr composition, between 14.5～19.0%, adopts stabilizing element as Ti simultaneously, Nb, two or more elements compounding of V etc. is added.In smelting process, add Al favourable to controlling steel inclusion, therefore in deoxidation treatment process, add suitable Al.But deal with Al deoxidation products Al improperly
2o
3can transfer inclusion to causes steel inclusion to affect deep drawability energy.
In order to obtain the corrosion resistance nature suitable with SUS304, steel of the present invention adopts low-carbon and nitrogen design route, as C:0.004～0.015%, N:0.004～0.015%, C+N≤0.025%, can improve erosion resistance by controlling impurity content, alloy Cr is controlled at 14.5～19.0% and guarantees that this stainless steel possesses necessary corrosion resistance and high temperature oxidation corrosion resistance performance.Simultaneously, by adding stabilizing element Nb, Ti, reduce total oxygen content in steel and not only can stablize impurity element carbon and nitrogen, simultaneously, by controlling the lower oxygen level (≤50ppm) of smelting molten steel, can effectively improve steel inclusion, when improving erosion resistance, can also improve the purity of steel, be conducive to improve the machine-shaping property of material.Add V and not only can improve intensity, can improve machined surface quality by crystal grain thinning simultaneously.In addition, in conjunction with control material structure grain fineness number (grain fineness number is controlled at 5-8 level), can fully improve the plasticity of material, make material r value surpass 1.5.By controlling Nb, Ti content and proportionlity, the carbon of appropriate Nb in not only can immobilization material, meanwhile, and the N of appropriate Ti in also can immobilization material, Nb, C, N in Ti co-controlling matrix, improve corrosion among crystalline grains and anti-urea uniform corrosion performance.When Nb or Ti stablize C and N, reduced the solid solution content in matrix, can also further improve erosion resistance and reduce wrinkling.Compare with SUS304 stainless steel, material of the present invention is by further reduction C content and economize Ni and control Cr content when guaranteeing material property, obviously may reduce material cost.Mentioned component design utilizes existing conventional equipment to be easy to obtain continuously cast bloom and hot-rolled sheet coil and cold product product, is conducive to manufacture and controls.
Summary of the invention
The object of the present invention is to provide low-cost stainless steel and manufacture method for a kind of exhaust gas purification system, it has the resistance to urea corrosive nature suitable with SUS304, meanwhile, this material has ferrite body-centred structure, thereby has low thermal expansivity and the thermal conductivity of Geng Gao; Meet high temperature and the common corrosion working conditions of urea of 400～600 ℃.
For achieving the above object, technical scheme of the present invention is:
The low-cost stainless steel of a kind of exhaust gas purification system, its composition weight percent is: C:0.004～0.015%, Si:0.15～0.50%, Mn:0.10～0.60%, Cr:14.5～19.0%, P≤0.040%, S≤0.005%, N:0.004～0.015%, C+N≤0.025%, V:0.01～0.1%, Al≤0.05%, all the other are Fe and inevitable impurity; In impurity element, Ni≤0.2%, Cu≤0.2%, O≤0.0050%, other impurity element total amount is lower than 0.05%; And, also comprise one or more in Nb and Ti as stabilizing element,
Nb is monostable fixed: Nb >=0.15%+3 * C, and (Nb+V) >=0.20%+3 * C, and, Nb≤0.50%;
Ti is monostable fixed: 0.15%≤Ti, and, 10 * (C+N)≤Ti≤0.30%, (Ti+V) >=12 * (C+N);
Nb, Ti bistable:
12×(C+N)≤(Nb+Ti)≤0.5％，Nb/Ti＝0.70-1.5。
The selection reason of ferritic stainless steel chemical composition design of the present invention is as follows:
C and N: steel grade of the present invention belongs to the economical stainless steel of ultra-low carbon nitrogen, therefore, in this steel, carbon and nitrogen belong to impurity element, need to reduce as far as possible its content.At present smelting equipment can be controlled at total amount by carbon and nitrogen and is less than 0.025% than being easier to meet in the situation that guaranteeing throughput, reaches the requirement of C:0.004～0.015%, N:0.004～0.015% simultaneously.Reducing carbon and nitrogen total amount is mainly to reduce as far as possible stabilizing element consumption, particularly reduces the use of Ti, guarantees the surface quality of product and improves corrosion among crystalline grains.
Cr: be the main alloy element that improves solidity to corrosion and intensity.Cr is the important element that improves stainless steel oxidation-resistance and urea corrosive nature, also improves the local corrosion abilities such as its resistance to spot corrosion in chloride soln and crevice corrosion simultaneously.Cr improves the intensity of steel, but the plasticity of too high reduction steel is unfavorable to moulding and weldability.Too lowly be unfavorable for improving its resistance to oxidation corrosive nature, range of choice 14.5～19.0%.
Si: add in steel and play deoxidation and the corrosion proof effect of improvement, the too low desoxydatoin that is unfavorable for, is generally greater than 0.15%.Be greater than 0.5%, processing and toughness are unfavorable, unfavorable to normal temperature compacted under.Consider overall performance, range of choice 0.15～0.50%.
Mn: weak austenite element, Mn can suppress the deleterious effect of sulphur in stainless steel, improves thermoplasticity.Too lowly be unfavorable for improving its thermoplasticity, be also unfavorable for improving the processability under normal temperature, be too highly unfavorable for guaranteeing its erosion resistance.Range of choice 0.10～0.60%.
V: there is more significant crystal grain thinning and propose high-intensity effect, for ferritic stainless steel, suitably adding V and be conducive to improve low temperature brittleness.
Ti and Nb:Ti and Nb are mainly used in preventing that chromium concn that in steel, chromium and carbon cause in conjunction with forming chromium carbide from reducing causes erosion resistance to reduce, and particularly cause intergranular corrosion; Ti can also be in steel sulphur be combined and form TiC
2s compound is to prevent the caused spot corrosion of MnS.Ti and Nb can improve stainless room temperature and hot strength, improve antifatigue and cold formability and the weldability of ferritic stainless steel, but unfavorable to the brittle transition temperature of steel.The nitride (TiN) that Ti and nitrogen form can affect surface and the inner quality of steel as inclusion, and the nitride (NbN) that Nb and nitrogen form also can reduce the thermoplasticity of steel.Successful when Ti content is greater than 0.05%, too much can produce surface imperfection and generally be no more than 0.30%.Successful when Nb content is greater than 0.15%, surpasses 0.50% and can too much cause forming thick Fe because of Nb
2nb, is unfavorable for forming materials performance, also increases manufacturing cost.Consider added C, N content, select wherein a kind of or two kinds to add element, range of choice as stabilization:
Nb is monostable fixed: Nb >=0.15%+3 * C, and (Nb+V) >=0.20%+3 * C, and, Nb≤0.50%;
Ti is monostable fixed: 0.15%≤Ti, and, 10 * (C+N)≤Ti≤0.30%, Ti+V >=12 * (C+N);
Nb, Ti bistable: 12 * (C+N)≤(Nb+Ti)≤0.5%, Nb/Ti=0.70-1.5.
Cu:Cu mainly comes in stainless steel steel scrap, adds copper can improve corrosive nature, but adds copper both to increase material cost, also causes steel scrap handling cost to increase simultaneously, meeting under corrosive nature condition, does not add Cu, and remaining Cu is no more than 0.2%.
Ni: in order to reduce manufacturing cost, adopted province's nickelalloy design, coordinated 14.5～19.0% Cr simultaneously, obtained ferritic structure, thereby make its thermal expansivity low compared with SUS304.Ni belongs to control element in ferritic stainless steel, reduces as far as possible the content of Ni, and total amount is no more than 0.20%.
Al:Al is used and is conducive to reduce its inclusion as stainless steel-making reductor.But too high meeting causes Al oxide compound to form to be caused toughness drop and affects product surface quality.In actual production, be relatively difficult to control add-on, while containing higher Si in alloy, can use less Al deoxidation.The application's steel grade adopts the Si deoxidation of certain content and adds a small amount of Al deoxidation, so Al≤0.050%.
O:O is one of impurity element in steel, mainly with the oxide inclusion form forming, exists, and higher O shows that inclusion is higher.Reduce O content in steel and just can guarantee that inclusion content of steel is lower, is conducive to improve plasticity and pitting corrosion.In steel, can guarantee that material has higher impact briquetting performance and corrosion resistance during O≤0.0050%.
P and S: in ferritic stainless steel, p and s can have a strong impact on stainless solidity to corrosion and processing characteristics, must strictly control, and general hope is controlled at P≤0.035%, S≤0.003%.
In the present invention except chromium in adopting (14.5～19%Cr), suitably adjust Pure Silicon Metal and manganese content, Pure Silicon Metal can play desoxydatoin in smelting, be conducive to adding and improving recovery rate of stabilizing element Ti, general silicone content is controlled and is greater than 0.20%, too high Pure Silicon Metal is unfavorable for again material formed at normal temp performance, and being controlled at 0.50% can not affect use with interior.Manganese has and the similar desoxydatoin of silicon, is too highly unfavorable for resistance to assurance corrodibility, and Mn is controlled in 0.60%.In order to improve corrosion resistance nature, particularly resistance to urea corrosion and anti-chlorine ion corrosion, by adding Nb and Ti, take and guarantee that the conversion of nitrogen oxides in tail gas is N
2after the corrosion aggravation that causes of the poor chromium of crystal boundary that causes of nitriding under comparatively high temps.Adding V can crystal grain thinning, improves intensity, and V content is no more than 0.1% conventionally, too high unfavorable to processing characteristics, but too low effect is not obvious, is generally not less than 0.01%.
Ni in material, Cu, as impurity element, is mainly derived from steel scrap, controls as far as possible, and common metal Ni is no more than 0.2%, can not affect use properties.Cu is no more than 0.20%, also can not worsen the corrosive nature of material.Meanwhile, also require metal A l to be no more than 0.05%, guarantee the least possible formation aluminate, improve processing characteristics.
Steel of the present invention can adopt a kind of or two kinds of modes in Ti, Nb to stablize C, N element, and Nb or Ti all can be for C in stabilized steel and N.But during bistable, Ti stablizes N because Ti is stronger than Ti and C keying action with N keying action; Equally, for Nb, Nb and C keying action are better than the keying action of Nb and N.Like this, the Ti in Ti, Nb bistable steel stablizes N, and Nb stablizes C, adds separately according to nitride and carbide stoichiometric ratio.By Nb and C is stable for the superfluous Ti of TiN, can also better improve the corrosion among crystalline grains of Ti or the mono-stabilized steel of Nb, improve stainless intergranular corrosion resistance corrosive nature.
Low-carbon and nitrogen Composition Design C:0.004～0.015% that the present invention adopts, N:0.004～0.015%, C+N≤0.025%, simultaneously, consider carbon and the nitrogen content of relative broad range, the independent interpolation of stabilizing element Nb or Ti should be guaranteed Nb>=0.15%+3 * C, Ti>=10 * (C+N), (Nb+V)>=0.20%+3 * C, Ti+V>=12 * (C+N), and while being no more than 0.30%, Nb, Ti bistable, 12 * (C+N)≤Nb+Ti≤0.50%, otherwise just easily form thick Fe
2nb, too much content also increases manufacturing cost.Consider the welding effect of weldment, in material, add separately Ti, its content also requires to be not less than 0.15% when guaranteeing Ti >=10 * (C+N), but do not surpass 0.30% yet, otherwise the TiN forming in casting process is easily attached to continuously cast bloom surface, also be unfavorable for guaranteeing material surface quality, also can increase reconditioning quality, finally can have influence on the corrosive nature of finished product.While adopting Nb and Ti jointly to add, Nb/Ti is 0.70-1.5 for well, simultaneously, also to guarantee 0.5Nb+Ti >=0.10%+5 (C+N), guarantee playing stably element stabilization, improve corrosive nature, but Nb+Ti does not surpass 0.50% yet, otherwise can increase cost and affect plasticity.This Composition Design can more easily be realized and smelting in existing production line.
Low-cost stainless manufacture method for exhaust gas purification system of the present invention, it comprises the steps:
1) smelt, cast
According to mentioned component, design, by Electric furnace steel making, AOD decarburization, VOD deoxidation three-step approach, make steel, and after VOD finishes, feed Si-Ca-Ba silk and titanium silk and process, obtain the molten steel that meets composition requirement after continuous casting become base, control pulling speed of continuous casting, 0.9～1.1m/min, strengthens induction stirring, 1200～1600 amperes, electric current, make proportion of equiaxed grain in continuously cast bloom be not less than 60%, continuously cast bloom is with warm figuring of surface, and reconditioning starting temperature is not less than 350 ℃, and reconditioning finishing temperature is not less than 180 ℃; 2) hot rolling
First hot rolling carries out 5～7 passage roughing, and rolling total reduction is controlled at 75%～85%, and wherein, the first passage rolling draft is controlled at and is no more than 25%, 1050～800 ℃ of start rolling temperatures, and remove surface scale;
Roughed bloom is through 7 passage finish rolling, total reduction is controlled at 60%～85%, the first passage rolling draft is controlled at and is no more than 40%, second, third passage rolling draft is controlled at and is no more than 35%, remaining passage rolling draft is no more than 30%, 1000～800 ℃ of finishing temperatures, cooling and batch acquisition hot-rolled sheet coil;
3) cold rolling, annealing
After the annealed pickling of hot-rolled sheet coil, carry out cold rolling processing, annealing temperature is 900～1050 ℃, and acid cleaning process is controlled as TV value is no more than 90, wherein, and T: thickness of slab, mm, V: speed, m/min; Cold rolling draft, 60～80%;
After cold-reduced sheet rolls, also need through cold rolled annealed, acid cleaning process is controlled and to be no more than 120 for TV value; 900～1050 ℃ of annealing temperatures and pickling, the cold rolled stainless steel sheet of acquisition grain size number 5-8 level, surface roughness Ra 0.10～0.70 μ m.
The present invention is by Electric furnace steel making, AOD decarburization, the steel-making of VOD deoxidation three-step approach and after VOD finishes, feed Si-Ca-Ba silk and titanium silk is processed, and comprehensively composition just can obtain the molten steel that meets composition requirement after meeting design requirement.By controlling the techniques such as casting process pulling rate (0.9～1.1m/min), reinforcement induction stirring (1200～1600 amperes, electric current), make molten steel be not less than 60% through proportion of equiaxed grain in continuous casting acquisition continuously cast bloom and continuously cast bloom, continuously cast bloom is with warm figuring of surface, reconditioning starting temperature is not less than 350 ℃, and reconditioning finishing temperature is not less than 180 ℃.After reconditioning, be with temperature to send process furnace to heat and be incubated certain hour and carry out hot rolling.First hot rolling carries out 5～7 passage roughing (temperature range 1050-800 ℃), and rolling total reduction is controlled at 75%～85%, and removes surface scale.Roughed bloom is through 7 passage finish rolling (1000～800 ℃ of temperature ranges), cooling and batch acquisition hot-rolled sheet coil.After the annealed pickling of hot-rolled sheet coil, carry out cold rolling processing.Cold rolling processing will be guaranteed certain rolling draft (60～80%).After rolling, cold-reduced sheet also needs through cold rolled annealed (900～1050 ℃ of temperature ranges) and pickling, by controlling annealing temperature and speed (TV value), make fully recrystallize of cold-rolling stainless steel, and grain size number reaches 5-8 level, and guarantee certain surface roughness Ra 0.10～0.70 μ m, so not only can guarantee that deep drawability can but also be conducive to improve general corrosion performance, obtain the cold-rolling stainless steel product that over-all properties meets the demands.
During industrial production, can produce the cold rolled stainless steel sheet that thickness is 0.8～2.5mm.
Beneficial effect of the present invention:
The present invention, in order to obtain the ferritic stainless steel with good corrosion resistance, has adopted the design of ultra-low carbon nitrogen, and the content of controlling C level N is no more than 0.015%; Meanwhile, in order reducing from causing this, to adopt the design that economizes Ni, to obtain single ferritic structure.By controlling Si, Mn, Cr equal size, particularly Cr is controlled at 14.5～19.0%, can guarantee good corrosion resistance nature; In order to obtain good processing characteristics, control oxygen level O≤0.0050% etc., and by controlling annealing temperature and TV value etc., guarantee to organize grain fineness number to be controlled at 5～8 grades.
The present invention adopt above-mentioned design stainless steel its at 350～600 ℃ and the corrosion resistance nature that sprays in the environment of urea, reached the stainless level of SUS304, can effectively eliminate the discharge of oxynitride.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The embodiment of steel of the present invention is referring to table 1, and its surplus is Fe and inevitable impurity.The manufacturing process of the embodiment of the present invention is referring to table 2.
Table 3 is mechanical property and the bit comparison of spot corrosion point of embodiment of the present invention steel and comparative example steel.Wherein, mechanical property detects yield strength, tensile strength, unit elongation, hardness.Determination of Corrosion Property spot corrosion point position and uniform corrosion performance.
Spot corrosion Point Measurement utilizes potentiodynamic technique to measure the pitting potential of stainless steel in neutral 3.5% sodium chloride solution.In experiment, get 3 mean value calculation net results.
The uniform corrosion of sample adopts U.S. AK company phlegma to consist of: 100ppm Cl
-, 100ppmNO
3 -, 5000ppmSO
4 2-, positively charged ion is NH
4 +, with dilute sulphuric acid, pH being adjusted to 3,5 or 10, the content that makes urea is 2.4wt%, and envrionment temperature adopts 560 ℃, and sample first heats 2 hours, then in test temperature is the corrosive fluid of 80 ℃, corrodes 30 minutes, and this is a corrosive cycle.Repeat 30 cycles, measure sample weightless, relatively the corrosion resistance nature of different-alloy.
Table 3: the mechanical property of embodiment of the present invention steel and comparative example steel and spot corrosion point position
From the results shown in Table 3, the economical stainless steel of province of the present invention nickel has with the suitable mechanical properties such as intensity and the corrosion resistance nature of contrast steel grade, can substitute SUS304 stainless steel for urea and the high-temperature corrosion environment of commercial car exhaust gas purification system.
Claims (2)
1. the low-cost stainless steel of exhaust gas purification system, its composition weight percent is: C:0.004～0.015%, Si:0.15～0.50%, Mn:0.10～0.60%, Cr:14.5～19.0%, P≤0.040%, S≤0.005%, N:0.004～0.015%, (C+N)≤0.025%, V:0.01～0.1%, Al≤0.05%, all the other are Fe and inevitable impurity; In impurity element, Ni≤0.2%, Cu≤0.2%, O≤0.0050%, other impurity element total amount is lower than 0.05%; And, also comprise one or more in Nb and Ti as stabilizing element;
Nb is monostable fixed: Nb >=0.15%+3 * C, and (Nb+V) >=0.20%+3 * C, and, Nb≤0.50%;
Ti is monostable fixed: 0.15%≤Ti, and, 10 * (C+N)≤Ti≤0.30%, (Ti+V) >=12 * (C+N);
Nb, Ti bistable:
12×(C+N)≤(Nb+Ti)≤0.5％，Nb/Ti＝0.70-1.5。
2. low-cost stainless manufacture method for exhaust gas purification system as claimed in claim 1, it comprises the steps:
1) smelt, cast
According to mentioned component, design, by Electric furnace steel making, AOD decarburization, VOD deoxidation three-step approach, make steel, and after VOD finishes, feed Si-Ca-Ba silk and titanium silk and process, obtain the molten steel that meets composition requirement after continuous casting become base, control pulling speed of continuous casting, 0.9～1.1m/min, strengthens induction stirring, 1200～1600 amperes, electric current, make proportion of equiaxed grain in continuously cast bloom be not less than 60%, continuously cast bloom is with warm figuring of surface, and reconditioning starting temperature is not less than 350 ℃, and reconditioning finishing temperature is not less than 180 ℃;
2) hot rolling
First hot rolling carries out 5～7 passage roughing, and rolling total reduction is controlled at 75%～85%, and wherein, the first passage rolling draft is controlled at and is no more than 25%; 1050～800 ℃ of start rolling temperatures, and remove surface scale;
Roughed bloom is through 7 passage finish rolling, total reduction is controlled at 60%～85%, the first passage rolling draft is controlled at and is no more than 40%, second, third passage rolling draft is controlled at and is no more than 35%, remaining passage rolling draft is no more than 30%, 1000～800 ℃ of finishing temperatures, cooling and batch acquisition hot-rolled sheet coil;
3) cold rolling, annealing
After the annealed pickling of hot-rolled sheet coil, carry out cold rolling processing, acid cleaning process is controlled as TV value is no more than 90, wherein, and T: thickness of slab, mm, V: speed, m/min; Cold rolling draft, 60～80%;
After cold-reduced sheet rolls, also need through cold rolled annealed, acid cleaning process is controlled and to be no more than 120 for TV value; 900～1050 ℃ of annealing temperatures and pickling, the cold rolled stainless steel sheet of acquisition grain size number 5-8 level, surface roughness Ra 0.10～0.70 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410175185.XA CN103966516A (en) | 2014-04-28 | 2014-04-28 | Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410175185.XA CN103966516A (en) | 2014-04-28 | 2014-04-28 | Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103966516A true CN103966516A (en) | 2014-08-06 |
Family
ID=51236512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410175185.XA Pending CN103966516A (en) | 2014-04-28 | 2014-04-28 | Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103966516A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106256919A (en) * | 2015-06-17 | 2016-12-28 | 宝钢不锈钢有限公司 | There is low cost ferritic stainless steel and the manufacture method thereof of condensation-resistant corrosion |
| CN107716584A (en) * | 2017-09-18 | 2018-02-23 | 张家港浦项不锈钢有限公司 | A kind of production method of super austenitic 904L stainless steel sheet strips |
| CN107835865A (en) * | 2015-07-17 | 2018-03-23 | 杰富意钢铁株式会社 | Ferrite-group stainless steel hot rolled steel plate and hot-roll annealing plate and their manufacture method |
| CN112410683A (en) * | 2020-09-27 | 2021-02-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Ferrite stainless steel material for automobile exhaust gas recirculation cooler and manufacturing method thereof |
| CN112496034A (en) * | 2020-11-30 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003171743A (en) * | 2001-12-06 | 2003-06-20 | Aichi Steel Works Ltd | Duplex stainless steel having excellent strength, toughness and seawater resistance, and production method therefor |
| CN102618790A (en) * | 2012-03-26 | 2012-08-01 | 宝山钢铁股份有限公司 | High-strength low-Cr ferrite stainless steel and manufacturing method thereof |
| CN103510014A (en) * | 2013-09-29 | 2014-01-15 | 宝钢不锈钢有限公司 | Economical stainless steel with resistance to urea and automobile exhaust corrosion and manufacturing method thereof |
-
2014
- 2014-04-28 CN CN201410175185.XA patent/CN103966516A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003171743A (en) * | 2001-12-06 | 2003-06-20 | Aichi Steel Works Ltd | Duplex stainless steel having excellent strength, toughness and seawater resistance, and production method therefor |
| CN102618790A (en) * | 2012-03-26 | 2012-08-01 | 宝山钢铁股份有限公司 | High-strength low-Cr ferrite stainless steel and manufacturing method thereof |
| CN103510014A (en) * | 2013-09-29 | 2014-01-15 | 宝钢不锈钢有限公司 | Economical stainless steel with resistance to urea and automobile exhaust corrosion and manufacturing method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106256919A (en) * | 2015-06-17 | 2016-12-28 | 宝钢不锈钢有限公司 | There is low cost ferritic stainless steel and the manufacture method thereof of condensation-resistant corrosion |
| CN107835865A (en) * | 2015-07-17 | 2018-03-23 | 杰富意钢铁株式会社 | Ferrite-group stainless steel hot rolled steel plate and hot-roll annealing plate and their manufacture method |
| CN107835865B (en) * | 2015-07-17 | 2020-05-05 | 杰富意钢铁株式会社 | Hot-rolled ferritic stainless steel sheet, hot-rolled annealed sheet, and methods for producing same |
| CN107716584A (en) * | 2017-09-18 | 2018-02-23 | 张家港浦项不锈钢有限公司 | A kind of production method of super austenitic 904L stainless steel sheet strips |
| CN112410683A (en) * | 2020-09-27 | 2021-02-26 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Ferrite stainless steel material for automobile exhaust gas recirculation cooler and manufacturing method thereof |
| CN112496034A (en) * | 2020-11-30 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
| CN112496034B (en) * | 2020-11-30 | 2022-03-22 | 山西太钢不锈钢股份有限公司 | Method for reducing straight crack width of stainless steel strip edge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101899625B (en) | Ferrite stainless steel and manufacturing method thereof | |
| KR100240741B1 (en) | Method of manufacturing stainless steel sheet of high corrosion resistance | |
| CN102482728B (en) | Process For Production Of High-strength Cold-rolled Steel Sheet Having Excellent Chemical Conversion Processability | |
| CN103147021B (en) | Martensitic stainless steel forged piece and forging and rolling heat treatment integrated production process | |
| CN110284070B (en) | 260 MPa-level hot-rolled acid-washed enamel steel and production method thereof | |
| CN102618790B (en) | High-strength low-Cr ferrite stainless steel and manufacturing method thereof | |
| CN103215524A (en) | Stainless steel welded pipe with excellent pipe processability and manufacturing method thereof | |
| CN101768702B (en) | Medium-chromium ferrite stainless steel for automobile with high formability and acidic corrosion resistance as well as manufacturing method thereof | |
| CN103966516A (en) | Low-cost stainless steel for tail gas purification system and manufacturing method of low-cost stainless steel | |
| CN103966528A (en) | Austenitic stainless steel containing Sn and manufacturing method thereof | |
| CN102234740B (en) | Ferrite stainless steel and manufacturing method of ferrite stainless steel cold-rolled sheet made therefrom | |
| CN104109809A (en) | High formability and low-chromium ferrite stainless steel and making method thereof | |
| CN105200330A (en) | High-temperature-resistant ferritic stainless steel and manufacturing method thereof | |
| CN103510014A (en) | Economical stainless steel with resistance to urea and automobile exhaust corrosion and manufacturing method thereof | |
| CN110714165B (en) | Cold-rolled sheet for 320 MPa-level household appliance panel and production method thereof | |
| CN102409266B (en) | Acid-corrosion-resisting steel with high low-temperature toughness and manufacturing method thereof | |
| CN103510005A (en) | Method for manufacturing middle-grade cold-rolled non-oriented electrical steel | |
| CN101693982B (en) | Martensite corrosion-resisting steel plate for cutting tool and manufacture method thereof | |
| CN101684535A (en) | Cold-roll steel sheet directly used by enamel once and production method thereof | |
| CN101724784A (en) | Stainless cold-rolling strip steel and manufacturing method thereof | |
| CN104928577A (en) | Steel plate with high hole expansion rate and excellent enameling performance and manufacturing method thereof | |
| CN102618804B (en) | Austenitic heat-resistant steel and production method thereof | |
| CN102206791A (en) | Mo-containing ferritic stainless steel and manufacturing method thereof | |
| CN101397638A (en) | Ferritic stainless steel for automobile exhaust emission system | |
| CN110777301B (en) | Cold-rolled enamel steel and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140806 |