CN105088101A - Steel for enamel heat transfer element having corrosion resistance and manufacturing method thereof - Google Patents
Steel for enamel heat transfer element having corrosion resistance and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses steel for an enamel heat transfer element having corrosion resistance and a manufacturing method thereof. The steel comprises the following chemical components in percentage by weight: not more than 0.010% of C, 0.40-0.60% of Mn, not more than 0.10% of Si, not more than 0.02% of P, not more than 0.02% of S, 0.02-0.06% of Als, 0.20-0.40% of Cu, 0.70-1.10% of Cr, 0.04-0.10% of Sb, 0.02-0.05% of Ti, 0.01-0.03% of Nb, 0.01-0.03% of Ni, and the balance of Fe and inevitable impurities. As such elements as Cu, Cr, Ni, Sb and Ti are added to the steel, the metal corrosion potential is deviated to a passivation area, a compact protective film is easy to be formed on the surface, the steel is excellent in corrosion resistance in a smoke environment, and the corrosion resistance is obviously better than that of a general low-carbon steel plate; and as the contents of C and Si in the steel are reduced and such proper alloy elements as Nb and Ti are added in the steel, the microstructure is reasonably controlled, the enamel coating quality of the steel plate is effectively improved, the steel plate can be applied to the surface enamel coating production, and such surface defect problems as enamel scale explosion, foaming and pinholes easily generated in traditional acid-resistant steel are solved.
Description
Technical field
The present invention relates to steel technical field, particularly relate to a kind of enamel heat transfer element steel and manufacture method thereof.
Background technology
Heat transfer element in air preheater is in the severe environment such as flue gas and Dust and runs, and needs to possess good corrosion resistance nature, and general employing is examined and stepped on steel, stainless steel or Glassed Steel to manufacture.Because enamel has excellent acid-alkali-corrosive-resisting performance, and cost is lower than stainless steel, and increasing air preheater adopts enamel heat transfer element.
At present, enamel heat transfer element is made by the certain thickness enamel of enamel firing on soft steel, disclose the patent of invention of many cold rolling enameling sheets both at home and abroad, such as, Chinese invention patent CN01802486.6, CN200810200579.0, CN201010179312.5, CN201410337333.3 etc., the composition of these steel plates and technological design require to carry out mainly for enameling process, although have good application of slip performance, can be used for manufacturing enamel heat transfer element, but such steel plate all belongs to common soft steel, there is no special erosion resistance design, steel plate erosion rate under flue gas environment is very fast.The erosion resistance of the enamel heat transfer element manufactured by such steel plate mainly relies on the outer field enamel protection of steel plate; and enamel heat transfer element may produce enamel surfaces defect in the fabrication process; in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon; and once local enamel shielding failure; steel are directly exposed in flue gas environment; corrosion is just rapid to produce from de-porcelain point, causes heat transfer element degradation or complete failure, greatly reduces the work-ing life of product.
Summary of the invention
The application provides a kind of enamel heat transfer element steel and the manufacture method thereof with erosion resistance, solve enamel heat transfer element of the prior art and may produce enamel surfaces defect in the fabrication process, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life.
The application provides a kind of enamel heat transfer element steel with erosion resistance, and the Chemical Composition weight percent of described steel is:
C≤0.010%, Mn0.40 ~ 0.60%, Si≤0.10%, P≤0.02%, S≤0.02%, Als0.02% ~ 0.06%, Cu0.20% ~ 0.40%, Cr0.70% ~ 1.10%, Sb0.04% ~ 0.10%, Ti0.02% ~ 0.05%, Nb0.01% ~ 0.03%, Ni0.01% ~ 0.03%, surplus is Fe and other inevitable impurity.
The application also provides a kind of manufacture method with the enamel heat transfer element steel of erosion resistance, and for the manufacture of above-mentioned steel, described method comprises:
Smelt also continuous casting and become strand;
Carry out hot continuous rolling to described strand, wherein, the Heating temperature of described hot continuous rolling is 1230 DEG C ~ 1300 DEG C, and finishing temperature is 850 DEG C ~ 950 DEG C, and coiling temperature is 680 DEG C ~ 730 DEG C;
Cold continuous rolling, the draft of described cold continuous rolling is 65% ~ 80%;
Bell-type annealing, annealing temperature is 700 DEG C ~ 760 DEG C, and annealing time is 20h ~ 30h, and smooth unit elongation is 0.5% ~ 1.3%.
Preferably, described smelting continuous casting becomes strand, specifically comprises:
Hot metal pretreatment, converter smelting, refining and continuous casting.
Preferably, before described bell-type annealing, described method also comprises: pickling.
Preferably, after described bell-type annealing, described method also comprises: finishing.
The application's beneficial effect is as follows:
The above-mentioned enamel heat transfer element steel with erosion resistance, on the one hand, because this steel plate with the addition of the elements such as Cu, Cr, Ni, Sb, Ti, metal corrosion potential offsets to passivation region, and surface easily forms fine and close protective membrane, in flue gas environment, there is good solidity to corrosion, be obviously better than common mild steel plate; On the other hand, this steel plate is by reducing C, Si content and adding the alloying elements such as suitable Nb, Ti, conservative control microtexture, effectively improve the application of slip quality of steel plate, make this steel plate can be used in the surperficial application of slip to produce, solve traditional duriron and easily produce the surface imperfection problems such as enamel fish scaling, foaming, pin hole, thus solve enamel heat transfer element of the prior art and may produce enamel surfaces defect in the fabrication process, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life.
The steel plate prepared by above technical scheme is through shaping, after the surperficial application of slip and enamel firing process, can be made into the enamel heat transfer element with high anti-corrosion, there is excellent acid-alkali-corrosive-resisting, the particularly feature of sulfuric acid dew point corrosion resistant, effectively can suppress the corrosion aggravation problem that common enamel heat transfer element causes because of surperficial enamel breakage or surface imperfection simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described by the accompanying drawing used required in describing embodiment below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1 is a kind of schema with the manufacture method of the enamel heat transfer element steel of erosion resistance of the application's better embodiment.
Embodiment
The embodiment of the present application is by providing a kind of enamel heat transfer element steel and the manufacture method thereof with erosion resistance, solve enamel heat transfer element of the prior art and may produce enamel surfaces defect in the fabrication process, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life.
Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
The Chemical Composition weight percent of described enamel heat transfer element steel is: C≤0.010%, Mn0.40 ~ 0.60%, Si≤0.10%, P≤0.02%, S≤0.02%, Als0.02% ~ 0.06%, Cu0.20% ~ 0.40%, Cr0.70% ~ 1.10%, Sb0.04% ~ 0.10%, Ti0.02% ~ 0.05%, Nb0.01% ~ 0.03%, Ni0.01% ~ 0.03%, surplus is Fe and other inevitable impurity.
The above-mentioned enamel heat transfer element steel with erosion resistance, on the one hand, because this steel plate with the addition of the elements such as Cu, Cr, Ni, Sb, Ti, metal corrosion potential offsets to passivation region, and surface easily forms fine and close protective membrane, in flue gas environment, there is good solidity to corrosion, be obviously better than common mild steel plate; On the other hand, this steel plate is by reducing C, Si content and adding the alloying elements such as suitable Nb, Ti, conservative control microtexture, effectively improve the application of slip quality of steel plate, make this steel plate can be used in the surperficial application of slip to produce, solve traditional duriron and easily produce the surface imperfection problems such as enamel fish scaling, foaming, pin hole, thus solve enamel heat transfer element of the prior art and may produce enamel surfaces defect in the fabrication process, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
Embodiment one
Enamel surfaces defect may be produced in the fabrication process to solve enamel heat transfer element of the prior art, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life, the application provides a kind of enamel heat transfer element steel with erosion resistance, steel plate itself has good erosion resistance, simultaneously can in the surface of steel plate application of slip, utilize the enamel heat transfer element that steel plate of the present invention manufactures, quick-fried without squama, enamel adherence is good, pin hole rate is low, under the damaged condition of local enamel, still there is good solidity to corrosion simultaneously.
The Chemical Composition weight percent of described enamel heat transfer element steel is: C≤0.010%, Mn0.40 ~ 0.60%, Si≤0.10%, P≤0.02%, S≤0.02%, Als0.02% ~ 0.06%, Cu0.20% ~ 0.40%, Cr0.70% ~ 1.10%, Sb0.04% ~ 0.10%, Ti0.02% ~ 0.05%, Nb0.01% ~ 0.03%, Ni0.01% ~ 0.03%, surplus is Fe and other inevitable impurity.
In the application, the effect of each element is as follows:
C≤0.010%: carbon is good solution strengthening element, but it is unfavorable to the plasticity of steel plate, by carbon content control below 0.01%, add carbide forming element by carbon fixation simultaneously, the intensity of steel plate can be ensured on the one hand, and plasticity is good, the incidence of enamel fish scaling and pin hole can also be reduced on the other hand.
Mn content is selected 0.40 ~ 0.60%: as solution strengthening element, during too high levels, steel plate plasticity significantly reduces, and be unfavorable for that processing uses, therefore Mn content should not more than 0.60%; Mn can be combined with S and form MnS and serve as hydrogen trap, significantly improves the fish scaling resistance of steel plate, when Mn and S content ratio is greater than 10 simultaneously, also effectively can suppress the hot rolling red brittleness problem that S element causes, and therefore, selection Mn content is more than 0.40%.
Si≤0.010%:Si is the harmful element in Glassed Steel, and Si content increases and significantly can reduce enamel adherence, and infringement surface quality, Si content is more low better, therefore, selects Si content to control 0.010% once.
P≤0.02%:P is impurity element, easily at Grain Boundary Segregation, increase steel plate fragility, the plasticity of infringement steel plate, content can not be too high, but P improves the most effective element of atmospheric corrosion resistance in alloying element, be anode depolarizer, with the element acting in conjunction such as Cu, Cr, Ni, contribute to forming uniform corrosion layer on steel surface, improve the corrosion resistance nature of steel, therefore need to retain a certain amount of P.
S≤0.02%, S is easily combined with Mn and forms plastic occluded foreignsubstance MnS, serve as the available hydrogen trap in steel, improve the fish scaling resistance of steel plate, but when S content is higher, easily form large-sized MnS on the one hand, significantly reduce the plasticity of steel plate, in steel, Mn content is limited on the other hand, and the S of excess also easily produces red brittleness.
Als0.02% ~ 0.06%, Al is strong reductor, can suppress the generation of other oxide compounds, adopts Al deoxidation can effectively control molten steel oxygen level, improves yield of alloy.
It is most fundamental element in corrosion-resistant steel that Cu content is selected at 0.20% ~ 0.40%, Cu, is conducive to forming stabilization rusty scale, can generates Cu2S protective membrane in industrial gasses and sulfuric acid dew point corrosion process, and the reaction of retardance cathode and anode, reduces the erosion rate of steel.And in the smelting and heat treatment process of steel, Cu is easily combined with S and forms CuS precipitated phase, quick-fried favourable to preventing squama, Cu can also affect the pickling speed of steel plate, improve the adherence of steel plate and enamel, but Cu too high levels can make steel plate plasticity reduce, fragility increases, also easily form segregation, be unfavorable for shaping of steel plate.
Cr content is selected 0.70% ~ 1.10%, Cr can form chromium oxide passivation film and stop further corrosion on steel surface, it is generally acknowledged and increase the solidity to corrosion that Cr content can improve steel plate, but Cr is larger to steel plate application of slip quality influence, the oxide film formed due to Cr can hinder enamel to the wetting of steel and infiltration, reduces adherence, and after the Enamelling Sheet Steel of Cr too high levels simultaneously, the quick-fried incidence of squama is larger, therefore, need Cr content to control in rational scope.
Sb content is selected 0.04% ~ 0.10%, Sb can in the erosion rate of the low steel plate of the enterprising step-down in basis containing Cu, Cr steel, especially to sulfuric acid dew point corrosion, there is good effect against corrosion, and Sb too high levels improves solidity to corrosion not quite to continuation, can damage the plasticity of steel plate on the contrary.
Ti content is selected 0.02% ~ 0.05%, Ti C, S, N can be combined formation inclusion in steel, energy fixed interval (FI) atom on the one hand, play the effect improving steel plate plasticity, can hydrogen trap be served as containing titanium inclusion on the other hand, improve steel plate scaling resistance, the constituent content such as Ti content needs and C, S, N forms certain proportion and just can give full play to advantageous effect simultaneously, otherwise too high Ti not only increases smelting cost, plate property also can be made to worsen.
Nb content is selected 0.01% ~ 0.03%, similar with the effect of Ti, Nb is strong carbon, nitride forming element, energy and C, N combines and forms tiny precipitated phase, both hydrogen trap can be served as, can also crystal grain thinning, improve armor plate strength, in the molten steel that oxygen level is higher, Nb can also form composite oxides with alloying elements such as Mn, the fish scaling resistance of steel plate can be improved, for ensureing that Nb element plays above useful effect, Nb content should lower than 0.010%, excessive Nb not only improves the DeGrain of plate property further simultaneously, also can bring the raising of cost simultaneously.
Ni content selects the adherence strength that can improve enamel at 0.01% ~ 0.03%, Ni, stops the diffusion of hydrogen in sintering process, strengthens the fish scaling resistance of steel plate, and Ni is to the corrosion resistance of steel plate simultaneously, but the raising of Ni content significantly can increase smelting cost.
The above-mentioned enamel heat transfer element steel with erosion resistance, on the one hand, because this steel plate with the addition of the elements such as Cu, Cr, Ni, Sb, Ti, metal corrosion potential offsets to passivation region, and surface easily forms fine and close protective membrane, in flue gas environment, there is good solidity to corrosion, be obviously better than common mild steel plate; On the other hand, this steel plate is by reducing C, Si content and adding the alloying elements such as suitable Nb, Ti, conservative control microtexture, effectively improve the application of slip quality of steel plate, make this steel plate can be used in the surperficial application of slip to produce, solve traditional duriron and easily produce the surface imperfection problems such as enamel fish scaling, foaming, pin hole, thus solve enamel heat transfer element of the prior art and may produce enamel surfaces defect in the fabrication process, in installation and use procedure, also there will be local collapse porcelain or de-porcelain phenomenon, and greatly reduce the technical problem in work-ing life.
Embodiment two
Based on same inventive concept, the application also provides a kind of manufacture method with the enamel heat transfer element steel of erosion resistance, said method comprising the steps of:
Step S101: smelt also continuous casting and become strand, specifically comprise: hot metal pretreatment, converter smelting, refining and continuous casting;
Step S102: hot continuous rolling is carried out to described strand, wherein, the Heating temperature of described hot continuous rolling is 1230 DEG C ~ 1300 DEG C, and finishing temperature is 850 DEG C ~ 950 DEG C, and coiling temperature is 680 DEG C ~ 730 DEG C;
Step S103: cold continuous rolling, the draft of described cold continuous rolling is 65% ~ 80%;
Step S104: bell-type annealing, annealing temperature is 700 DEG C ~ 760 DEG C, and annealing time is 20h ~ 30h, and smooth unit elongation is 0.5% ~ 1.3%.
Particularly, before step 104, described method also comprises pickling.
Particularly, after step 104, described method also comprises finishing.
Hot continuous rolling Heating temperature is 1230 ~ 1300 DEG C, more owing to adding alloy species in steel, adopts high Heating temperature can ensure the abundant austenitizing of steel billet, reach the object of homogeneous microstructure, in steel, compound can fully dissolve simultaneously, separates out, can play the effect of crystal grain thinning in process of cooling.Finishing temperature control, at 850 ~ 950 DEG C, can avoid the mixed crystal problem that two-phase region rolling brings.Oiler temperature control, at 680 ~ 730 ° of C, can ensure that precipitated phase is fully separated out, and is conducive to fish scaling resistance.
Cold rolling draft controls 65 ~ 80%, adopts higher cold rolling draft can increase deformation energy in steel, reduces recrystallization temperature, also helps texture evolution simultaneously, improve steel formability performance.
Annealing adopts bell-type annealing, and it is 700 ~ 760 DEG C that its annealing temperature controls, annealing time 20 ~ 30h, smooth unit elongation 0.5 ~ 1.3%, and bell-type annealing temperature is relatively low, annealing time length can ensure recrystallize completely and precipitate fully separate out; Flatten whole unit elongation according to thickness piece style, can effectively improve plate shape, optimize mechanical property simultaneously.
The steel plate prepared by above technical scheme is through shaping, after the surperficial application of slip and enamel firing process, can be made into the enamel heat transfer element with high anti-corrosion, there is excellent acid-alkali-corrosive-resisting, the particularly feature of sulfuric acid dew point corrosion resistant, effectively can suppress the corrosion aggravation problem that common enamel heat transfer element causes because of surperficial enamel breakage or surface imperfection simultaneously.
Compare with regard to specific experiment below and be described.
Table 1 is the value list of various embodiments of the present invention and comparative example;
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example;
The value list (wt%) of table 1 various embodiments of the present invention and comparative example
| Embodiment | C | Mn | Si | P | S | Als | Cu | Cr | Sb | Ti | Nb | Ni |
| 1 | 0.005 | 0.40 | 0.05 | 0.012 | 0.015 | 0.042 | 0.29 | 0.61 | 0.058 | 0.031 | 0.028 | 0.022 |
| 2 | 0.009 | 0.51 | 0.08 | 0.015 | 0.011 | 0.025 | 0.21 | 0.48 | 0.079 | 0.050 | 0.016 | 0.045 |
| 3 | 0.002 | 0.55 | 0.09 | 0.012 | 0.020 | 0.051 | 0.35 | 0.35 | 0.046 | 0.022 | 0.030 | 0.050 |
| 4 | 0.004 | 0.43 | 0.08 | 0.018 | 0.013 | 0.034 | 0.38 | 0.56 | 0.071 | 0.042 | 0.012 | 0.032 |
| 5 | 0.010 | 0.47 | 0.06 | 0.016 | 0.015 | 0.045 | 0.33 | 0.51 | 0.092 | 0.030 | 0.013 | 0.025 |
| 6 | 0.001 | 0.60 | 0.10 | 0.010 | 0.018 | 0.060 | 0.36 | 0.30 | 0.040 | 0.020 | 0.027 | 0.048 |
| 7 | 0.006 | 0.51 | 0.07 | 0.020 | 0.016 | 0.020 | 0.40 | 0.65 | 0.066 | 0.035 | 0.021 | 0.020 |
| 8 | 0.005 | 0.45 | 0.08 | 0.015 | 0.019 | 0.036 | 0.31 | 0.70 | 0.053 | 0.032 | 0.018 | 0.021 |
| 9 | 0.008 | 0.49 | 0.04 | 0.013 | 0.020 | 0.041 | 0.37 | 0.58 | 0.100 | 0.046 | 0.010 | 0.034 |
| 10 | 0.007 | 0.51 | 0.10 | 0.017 | 0.015 | 0.046 | 0.20 | 0.61 | 0.071 | 0.035 | 0.026 | 0.028 |
| Comparative example 1 | 0.061 | 0.50 | 0.34 | 0.017 | 0.006 | 0.045 | 0.38 | 1.20 | 0.075 | 0.001 | 0.001 | 0.008 |
| Comparative example 2 | 0.072 | 0.41 | 0.34 | 0.015 | 0.017 | 0.038 | 0.35 | 0.46 | 0.076 | 0.031 | 0.021 | 0.023 |
| Comparative example 3 | 0.008 | 0.46 | 0.40 | 0.013 | 0.008 | 0.036 | 0.27 | 0.53 | 0.75 | 0.002 | 0.004 | 0.034 |
| Comparative example 4 | 0.005 | 0.44 | 0.06 | 0.014 | 0.016 | 0.047 | 0.09 | 0.97 | 0.81 | 0.022 | 0.013 | 0.026 |
| Comparative example 5 | 0.004 | 0.51 | 0.08 | 0.015 | 0.020 | 0.050 | 0.34 | 0.35 | 0.001 | 0.022 | 0.030 | 0.010 |
Various embodiments of the present invention are produced according to following steps:
1) hot metal pretreatment, converter smelting, refining continuous casting is carried out; 2) to strand heating, slab heating temperature is controlled at 1230 ~ 1300 DEG C;
3) carry out hot continuous rolling, control finishing temperature at 850 ~ 950 DEG C; 4) carry out batching also pickling, control coiling temperature at 680 ~ 730 DEG C;
5) carry out cold continuous rolling, controlling cold rolling draft is 65 ~ 80%; 6) anneal, adopt bell-type annealing, its annealing temperature controls at 700 ~ 760 DEG C, and annealing time is at 20 ~ 30h, and smooth unit elongation is 0.5 ~ 1.3%; 7) finishing stand-by.
The processing parameter of table 2 various embodiments of the present invention and comparative example
Obtain steel plate finished product with above-described embodiment and carry out erosion rate detection, adopt 5% sulfuric acid soak test under 50 DEG C of conditions, and compare with the erosion rate of industrial cold rolling enameling sheet, found that, the erosion rate of the corresponding steel plate of embodiment 1 ~ 10 is 5 ~ 10% of cold rolling enameling sheet, illustrate that the corrosion resistance to sulfuric acid of gained steel plate of the present invention improves more than 10 times than traditional cold rolling enameling sheet, erosion rate and the cold rolling enameling sheet of the corresponding steel plate of comparative example 4,5 are close, illustrate that its solidity to corrosion is not improved.
Application of slip test is carried out with above-described embodiment gained steel plate finished product, Ferro company enamel powder is adopted to carry out electrostatic dusting, through 850 DEG C of enamel firing 5min, test piece visual inspection and enamel property detection is carried out after naturally cooling, found that, without the quick-fried point of squama after the application of slip of embodiment 1 ~ 10 corresponding steel plate, enamel layer adherence strength is 1 grade, enamel pinhole number is lower than 20 every square metre, the scaling resistance of gained steel plate of the present invention is described, the application of slips such as enamel adherence and anti-pin hole are functional, be applicable to completely make enamel heat transfer element, and there is the quick-fried point of squama in various degree in comparative example 1 ~ 4, enamel layer adherence strength is only 2 ~ 3 grades, enamel pinhole number is more than 100 every square metre, illustrate that its application of slip is second-rate, be not suitable for and carry out application of slip manufacture enamel heat transfer element.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. have an enamel heat transfer element steel for erosion resistance, it is characterized in that, the Chemical Composition weight percent of described steel is:
C≤0.010%, Mn0.40 ~ 0.60%, Si≤0.10%, P≤0.02%, S≤0.02%, Als0.02% ~ 0.06%, Cu0.20% ~ 0.40%, Cr0.70% ~ 1.10%, Sb0.04% ~ 0.10%, Ti0.02% ~ 0.05%, Nb0.01% ~ 0.03%, Ni0.01% ~ 0.03%, surplus is Fe and other inevitable impurity.
2. have a manufacture method for the enamel heat transfer element steel of erosion resistance, for the manufacture of steel as claimed in claim 1, it is characterized in that, described method comprises:
Smelt also continuous casting and become strand;
Carry out hot continuous rolling to described strand, wherein, the Heating temperature of described hot continuous rolling is 1230 DEG C ~ 1300 DEG C, and finishing temperature is 850 DEG C ~ 950 DEG C, and coiling temperature is 680 DEG C ~ 730 DEG C;
Cold continuous rolling, the draft of described cold continuous rolling is 65% ~ 80%;
Bell-type annealing, annealing temperature is 700 DEG C ~ 760 DEG C, and annealing time is 20h ~ 30h, and smooth unit elongation is 0.5% ~ 1.3%.
3. method as claimed in claim 2, is characterized in that, described smelting continuous casting becomes strand, specifically comprises:
Hot metal pretreatment, converter smelting, refining and continuous casting.
4. method as claimed in claim 2, it is characterized in that, before described bell-type annealing, described method also comprises: pickling.
5. method as claimed in claim 2, it is characterized in that, after described bell-type annealing, described method also comprises: finishing.
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| CN114318126A (en) * | 2020-09-30 | 2022-04-12 | 上海梅山钢铁股份有限公司 | Hot-rolled pickled steel plate for acid corrosion resistant enamel heat exchanger and manufacturing method thereof |
| CN115181902A (en) * | 2022-05-12 | 2022-10-14 | 马鞍山钢铁股份有限公司 | Cold-rolled low-alloy steel plate for double-sided enamel and preparation method thereof |
| CN115181902B (en) * | 2022-05-12 | 2023-08-25 | 马鞍山钢铁股份有限公司 | Cold-rolled low-alloy steel plate for double-sided enamel and preparation method thereof |
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| CN105088101B (en) | 2017-05-31 |
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