CN105316579A - Thin hot rolled pickled steel plate and fabrication method thereof for water heater enamel liner - Google Patents
Thin hot rolled pickled steel plate and fabrication method thereof for water heater enamel liner Download PDFInfo
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Abstract
The invention relates to a thin hot rolled pickled steel plate and a fabrication method thereof for a water heater enamel liner. The steel plate is composed of, by weight, 0.03%-0.09% of C, 0.005-0.035% of Si, 0.40-0.80% of Mn, at most 0.018% of P, at most 0.014% of S, at most 0.0050% of N, 0.002%-0.055% of Al, 0.03%-0.06% of Ti, 0.03%-0.06% of Cu and the balance iron and unavoidable impurities. The steel plate is 1.5-2.0 mm in thickness. The method includes the steps of refining liquid steel, conducting continuous casting to obtain a continuous cast plate billet which is then heated, performing hot rolling on the plate billet, coiling the billet after cooling, and performing acid pickling and withdrawal straightening. The thin pickled hot rolled steel plate capable of completely overcoming the defects that stamping wrinkling/cracking occurs, the gaps of formed openings during edge coiling are unstable in size and enamel cracking happens after enameling can be effectively fabricated.
Description
Technical field
The present invention relates to a kind of hot rolling acid-cleaning steel plate and manufacture method thereof, especially a kind of enamel internal container of water-heater Thin Specs hot rolling acid-cleaning steel plate and manufacture method thereof.
Background technology
According to the applicant understood, more and more extensive in the application of water-heater industry enamel inner container, enamel inner container is composited through high temperature enamel firing by hot rolling acid-cleaning steel plate and enamel usually, has feature wear-resisting, corrosion-resistant, that any surface finish is attractive in appearance, can ensure that the quality of water is not subject to the impact of corrosion and elemental release thing.
With high-quality latten for raw material, remove surface oxide layer through pickling unit, through trimming, after straightening, smooth, oiling, the hot rolling acid-cleaning steel plate that surface quality, mechanical property, plate shape etc. are better than hot-rolled sheet can be obtained.The advantage of hot rolling acid-cleaning steel plate is mainly: 1) surface quality is good, because hot rolling acid-cleaning steel plate eliminates scale on surface, improves surface quality of steel, is therefore convenient to welding and impact briquetting.2) dimensional precision is high, and template can be made after smooth to change a lot, thus reduces the deviation of roughness.3) improve surface smoothness, enhance appearance effect.4) environmental pollution that user disperses pickling to cause can be reduced.5) can Some substitute cold-reduced sheet, reduce water-heater manufacturing concern production cost.
The metal base mould component of enamel internal container of water-heater mainly comprises the two portions such as end socket and ladle body, the end socket of inner bag adopts punching stretch technological forming, require that steel plate has good stamping formabilily, and ladle body component be by roll up circle shaping after, be welded into cylindrical member with automatic plasma/silk filling submerged welding process.In order to adapt to roll up round shaping and plasma/silk filling submerged-arc welding process requirement, the shaping aft opening degree gap length of volume circle is moderate, requires that steel plate has moderate, stable intensity, thickness and precision.
Meanwhile, contriver finds in practice, for hot rolled strip, thickness specification is thinner, and hot rolled strip will be longer, and surface-area also can be multiplied, cause rapid heat dissipation, temperature drop large, be easy to cause finishing temperature not reach the setting requirement of cooling controlling and rolling controlling process, cause production to be restricted; The particularly rolling of thin slab product, this problem is more outstanding.
The thickness specification of existing enamel internal container of water-heater hot rolling acid-cleaning steel plate used is 1.5 ~ 3.0mm, existing hot-rolled production process can meet the hot rolling acid-cleaning steel plate that batch stably produces more than thickness 2.0mm, but for the product of thickness specification at 1.5 ~ 2.0mm, the setting not reaching cooling controlling and rolling controlling process because of its finishing temperature requires to limit the production of this type of specification acid-washed product, 1.5 ~ 2.0mm thickness specification product that existing hot-rolled production process is produced, easily exist punching press wrinkling/cracking, volume circle forming open degree gap is suddenly big or suddenly small, the defect such as burst porcelain after enamel.
Find through retrieval, the Chinese invention patent (title: high-strength steel for water heater inner container and production method thereof) of application number 200810047087.2 publication number CN101255530B, the Chinese invention patent application (title: 380MPa level one side enamel hot rolling acid-cleaning steel plate and production method thereof) of application number 2013107331354.9 application publication number CN103643118A individually discloses steel for water heater inner container and production method thereof, in its embodiment, also shows that its production method can produce the steel for water heater inner container of below thickness 2.0mm respectively simultaneously.But the prior art being representative with these patent/patent applications does not find in fact there is previously described defect in the Thin Specs steel band production process of below thickness 2.0mm, thus cannot provide the solution for this defect.
Summary of the invention
Technical problem to be solved by this invention is: overcome prior art Problems existing, a kind of enamel internal container of water-heater Thin Specs hot rolling acid-cleaning steel plate is provided, thoroughly avoid punching press wrinkling/cracking, the defect such as burst porcelain after suddenly big or suddenly small, the enamel in volume circle forming open degree gap; The manufacture method of this steel plate is provided simultaneously.
The technical scheme that the present invention solves its technical problem is as follows:
A kind of enamel internal container of water-heater Thin Specs hot rolling acid-cleaning steel plate, it is characterized in that, be made up of by weight percentage following chemical composition: C 0.03 ~ 0.09%, Si 0.005 ~ 0.035%, Mn 0.40 ~ 0.80%, P≤0.018%, S≤0.014%, N≤0.0050%, Al 0.002 ~ 0.055%, Ti 0.03 ~ 0.06%, Cu 0.03 ~ 0.06%, surplus is iron and inevitable impurity; The thickness of steel plate is 1.5-2.0mm; The yield strength of steel plate is 330-450Mpa, and tensile strength is 400 ~ 520Mpa, elongation after fracture >=22%; The main microstructure of steel plate is ferrite, secondary microstructure is perlite, and the grain size number of organizing of steel plate is 8 ~ 10 grades.
The present invention also provides:
A manufacture method for enamel internal container of water-heater Thin Specs hot rolling acid-cleaning steel plate, is characterized in that, comprise the following steps:
The first step, molten steel is carried out refining treatment, it is made to be made up of by weight percentage following chemical composition: C 0.03 ~ 0.09%, Si 0.005 ~ 0.035%, Mn 0.40 ~ 0.80%, P≤0.018%, S≤0.014%, N≤0.0050%, Al 0.002 ~ 0.055%, Ti 0.03 ~ 0.06%, Cu 0.03 ~ 0.06%, surplus is iron and inevitable impurity;
Second step, the first step gained molten steel is carried out continuous casting obtain continuous casting steel billet; By continuous casting steel billet in 1200 DEG C ~ 1220 DEG C heating;
3rd step, second step gained slab is carried out hot rolling, hot rolling adopts the two-part rolling technology be made up of roughing and finish rolling; Roughing is 5 passage tandem rollings, and roughing end temp is 980 DEG C ~ 1030 DEG C, workpiece thickness >=36mm after roughing; Finish rolling is 7 passage tandem rollings, and in the rolling of austenite one phase district, finish rolling end temp is 810 DEG C ~ 860 DEG C, rolling draft >=90% of finish rolling; At the end of finish rolling, control steel plate thickness is 1.5-2.0mm and plate crown is 20-40 μm;
4th step, the 3rd step gained steel plate is carried out section cooling, section cooling adopts the back segment type of cooling; Coil of strip is coiled at coiling temperature 600 DEG C ~ 660 DEG C; Improve steel-plate shape through pickling drawing-correcting, control straightening unit elongation is 0.8-1.5% simultaneously; Get product, the yield strength of finished product is 330-450Mpa, and tensile strength is 400 ~ 520Mpa, elongation after fracture >=22%; The main microstructure of steel plate is ferrite, secondary microstructure is perlite, and the grain size number of organizing of steel plate is 8 ~ 10 grades.
The technical scheme that the inventive method is perfect is further as follows:
Preferably, in the 3rd step, after roughing, workpiece thickness is 36mm or 38mm.
Preferably, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.086%, Si 0.033%, Mn 0.67%, P 0.012%, S 0.006%, N 0.0035%, Al 0.004%, Ti 0.041%, Cu 0.051%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1218 DEG C; In 3rd step, roughing end temp is 1015 DEG C, and after roughing, workpiece thickness is 38mm, and finish rolling end temp is 857 DEG C, at the end of finish rolling, and control steel plate thickness is 1.5mm and plate crown is 23 μm; Coiling temperature 640 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 390Mpa, and tensile strength is 510Mpa, and elongation after fracture is 36.5%.
Preferably, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.051%, Si 0.027%, Mn 0.74%, P 0.009%, S 0.012%, N 0.0015%, Al 0.006%, Ti 0.050%, Cu 0.036%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1210 DEG C; In 3rd step, roughing end temp is 1005 DEG C, and after roughing, workpiece thickness is 38mm, and finish rolling end temp is 820 DEG C, at the end of finish rolling, and control steel plate thickness is 1.7mm and plate crown is 31 μm; Coiling temperature 630 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 420Mpa, and tensile strength is 485Mpa, and elongation after fracture is 39%.
Preferably, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.066%, Si 0.030%, Mn 0.50%, P 0.015%, S 0.014%, N 0.0029%, Al 0.049%, Ti 0.035%, Cu 0.042%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1208 DEG C; In 3rd step, roughing end temp is 1000 DEG C, and after roughing, workpiece thickness is 36mm, and finish rolling end temp is 837 DEG C, at the end of finish rolling, and control steel plate thickness is 1.8mm and plate crown is 38 μm; Coiling temperature 620 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 380Mpa, and tensile strength is 480Mpa, and elongation after fracture is 37%.
Preferably, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.031%, Si 0.009%, Mn 0.61%, P 0.014%, S 0.007%, N 0.0031%, Al 0.037%, Ti 0.038%, Cu 0.045%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1204 DEG C; In 3rd step, roughing end temp is 990 DEG C, and after roughing, workpiece thickness is 36mm, and finish rolling end temp is 840 DEG C, at the end of finish rolling, and control steel plate thickness is 2.0mm and plate crown is 29 μm; Coiling temperature 600 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 400Mpa, and tensile strength is 520Mpa, and elongation after fracture is 42%.
The technology point of manufacture method of the present invention is as follows:
1. steel grades design
Due to thin format hot rolled steel plate rapid heat dissipation, temperature drop is large, one aspect of the present invention is by the suitable increase of C, Mn element proportioning, reduce phase point temperature, phase point temperature is reduced on the other hand by adding appropriate Cu element, thus avoid finishing temperature not reach cooling controlling and rolling controlling process design requirements, and finishing rolling step rolled piece is avoided to enter two-phase region rolling.
2. the setting of continuous casting steel billet Heating temperature
For guaranteeing that finishing rolling step finishing temperature meets the requirement of cooling controlling and rolling controlling process, burning 1150 DEG C ~ 1180 DEG C scopes by routine between steel temperature-controlled area, being above adjusted within 1200 DEG C ~ 1220 DEG C scopes.Improve and burn steel temperature, significantly can increase the physical sensible heat that finishing rolling step rolled piece is brought into, reach cooling controlling and rolling controlling process to finishing temperature requirement, the rolling stability being simultaneously also conducive to finishing rolling step improves.
3, the setting of roughing end temp and workpiece thickness
Roughing end temp affects the generation of surface of steel plate iron scale equally, roughing end temp is too high, then on the roller-way of roughing mills to finishing train, intermediate blank surface forms too much secondary oxidation iron iron sheet, finishing stands is not easily removed, iron scale spot flaw can be formed at surface of steel plate after pickling, or occur enamel fish scaling defect after causing enamel and affect the use of the finished product.Roughing end temp of the present invention is set as 980 DEG C ~ 1030 DEG C.
Workpiece thickness affects steel plate finishing temperature, particularly steel plate edge finishing temperature, workpiece thickness is thin, rolled piece surface-area is large, rapid heat dissipation, and process temperature drop is large, cause follow-up finish rolling finishing temperature too low, particularly steel plate edge temperature drop is very large, and steel plate edge is in ferrite+austenite two-phase region rolling, causes the sharply deterioration of forming property.Have based on this, the present invention is directed to the product of 1.5-2.0mm thickness specification, workpiece thickness is set as more than 36mm, preferred 36mm or 38mm.
4. the setting of finish rolling end temp
Finishing stands of the present invention is in the rolling of austenite one phase district, if finish rolling end temp is too low, finishing stands is in ferrite+austenite two-phase region rolling, then can form the hot rolling texture being unfavorable for Pressing Deformation, the processability index plastic strain ratio of steel plate is sharply reduced, particularly steel plate anisotropy is serious, causes steel plate ftracture when Pressing Deformation or form ear defect processed.If finish rolling end temp is too high, then surface of steel plate iron scale is serious, not easily removes during pickling.Consider practical situation of the present invention, setting finish rolling end temp is 810 DEG C ~ 860 DEG C.
5, hot-rolled steel sheet convexity range set
Hot-rolled steel sheet thickness is that centre is slightly thick, both sides are slightly thin on steel plate width direction, and this is not mainly in order to both sides vibration occurs steel plate when ensureing hot rolling.If but convexity is excessive, then obtains blank for when inner bag ladle body volume circle is shaping subsequently at steel plate different sites, the seam gap size of generation can be caused inconsistent, affect follow-up welding sequence quality.Liner end enclosure stamping in addition, as thickness fluctuation is large, also can produce punching press gauffer defect.Therefore the plate crown of the present invention's setting is 20-40 μm.
6, the setting of hot-rolling coiling temperature
Hot-rolling coiling temperature is too high, then terminating to increase obviously to batching surface of steel plate iron scale thickness during this period of time in finish rolling, affecting follow-up pickling.As hot-rolling coiling temperature is too low, armor plate strength increases, and elongation declines, and also unfavorable to formability.Suitably low coiling temperature is conducive to the distortion dislocation produced when hot rolling preserved by steel plate, and dislocation can fix C, the atom N of free state, is conducive to eliminating discontinuous yielding phenomenon.The coiling temperature scope of the present invention's setting is 600 DEG C ~ 660 DEG C.
7, the setting of pickling drawing-correcting
Pickling drawing-correcting to plate shape and performance impact extremely important, straightening first carries out mechanical scale breading on the one hand before steel plate enters pickling tank, be conducive to the efficiency improving follow-up pickling, the unrelieved stress of hot-rolled steel plate operation can be eliminated on the other hand, significantly improve thin slab product plate shape.If straightening rate is too low, do not have the effect improving plate shape, if but straightening rate is too high, and steel plate work hardening is serious, and elongation and forming property all can reduce.Straightening elongation of the present invention is set as 1.2%.
The effect of the present invention's each composition used is as follows:
Carbon: carbon content scope of the present invention needs strict restriction, because armor plate strength is responsive to carbon content.The too high meeting of carbon content causes intensity too high, can form the carbide particle of more thick fragility in steel, to plasticity and toughness unfavorable, and cause forming property sharply to worsen; Meanwhile, too high carbon content increases welding carbon equivalent, is unfavorable for welding processing.Carbon content is too low, and armor plate strength reduces, and meanwhile, the transformation temperature of steel improves, at finishing rolling step, particularly to the product of Thin Specs, finishing temperature does not reach production engineering specifications, two-phase region rolling can be caused, cause that template is bad, edge mixed crystal, totally unfavorable to impact briquetting.In addition, carbon is also the effective element reducing transformation temperature, for ensureing the administration measure of finish-rolling process, avoiding the generation of edge mixed crystal, must ensure certain carbon element content.Meanwhile, if carbon content a wider range can cause armor plate strength to fluctuate greatly, gap size fluctuation between ladle body volume circle, causes larger impact to follow-up welding.Consider above various factors, and in conjunction with practical situation, the carbon content of the present invention's setting is 0.03% ~ 0.09%.
Silicon: silicon is solid-solubilized in steel matrix certain strengthening effect, and it is favourable to deoxidation, desulfurization to contain appropriate silicon during melting in steel.But the present invention must control silicone content, when silicone content is higher, serious rust red iron scale Fe can be formed on hot-rolled sheet surface
2o
3, in follow-up acid cleaning process, be difficult to pickling eliminate.It is 0.005 ~ 0.035% that the present invention limits silicone content.
Manganese: manganese element is a kind of traditional reinforced alloys element, Fe content improves, and the intensity of product also can improve thereupon, but the cost of the corresponding increase steel of meeting, also can increase carbon equivalent, be unfavorable for welding.Meanwhile, manganese element significantly can reduce the transformation temperature of steel, for ensureing that thin slab product avoids two-phase region rolling, avoiding the generation of edge mixed crystal, needing manganese element content to have a definite limitation.Also for ease of the fluctuation reducing intensity, also need to limit Fe content scope.It is 0.40% ~ 0.80% that the present invention limits Fe content scope.
Sulphur and phosphorus: sulphur forms sulfide inclusion in steel, make its ductility and toughness reduce.During steel rolling, because MnS is mingled with along with rolling direction extends, the anisotropy of steel is increased the weight of, time serious, causes Laminated steel.The high weldability to steel of sulphur content is unfavorable simultaneously.The high cold shortness that can increase steel of phosphorus content, makes the brittle transition temperature of steel rise.Consider actual process controllability, the present invention limits sulphur content≤0.014%, phosphorus content≤0.018%.
Nitrogen: nitrogen is the subsidiary product of STEELMAKING PRODUCTION, and can make full use of, the nitrogen in steel and titanium, carbon produce Secondary phase particle Ti (CN) compound that is tiny, disperse, is conducive to prevention enamel fishscale defect.But the too high meeting of nitrogen content seriously reduces plasticity and the toughness of material, and too low nitrogen content can increase corresponding control nitrogen production cost.The present invention limits nitrogen content≤0.0050%.
Aluminium: aluminium effect is in the present invention deoxidation in steel making, its deoxidation products is Al
2o
3be removed after can being combined with slag, and be retained in steel for Als.The Als being applicable to content in steel can ensure the cleanliness factor of steel; Meanwhile, Als also can play the effect of crystal grain thinning.But the increase of Als content can cause the increase of steel-making cost, bring difficulty also to the organization of production of continuous casting.It is 0.002% ~ 0.055% that the present invention limits Al content.
Titanium: titanium is the one of the chief elements producing Secondary phase particle, is also one of Steel for enamel key component element.Its addition need be greater than 0.03% usually.But titanium elements is strong deoxidant element, in molten steel, the dystectic oxide compound of oxidizable generation, causes larger difficulty to the organization of production of continuous casting; Meanwhile, in steel during titanium elements content height, in hot rolling production process, temperature control requirement is higher, and the strength property fluctuation of product is very large.Therefore, considering from producing the angle easily realized, usually wishing that titanium elements content can not be too high.The present invention selects titanium content to be: 0.03 ~ 0.06%, and this is also most economical, is also the span of control the most easily realized in producing.
Copper: copper and iron are mutual solubility element when solid phase, when iron join one have quantitative copper after, significantly can reduce α iron phase change transition temperature, according to Fe-Cu phasor, after allocating appropriate copper into, α iron phase change line can be reduced to 780 DEG C from 850 DEG C.Therefore, add appropriate copper and reduce phase transformation transition point temperature, can expand the rolling technology window rolling Thin Specs hot rolled strip, in the production of solution thin slab product, Yin Wendu control does not reach the mixed crystal problem that processing requirement causes.But, the too high problem causing again the difficult pickling of pickling process and red iron sheet of copper content.Therefore, the present invention selects copper content to be: 0.03 ~ 0.06%, and this is also most economical, also can not cause the problem of the difficult pickling of pickling process.
Technical conceive of the present invention is as follows:
From practical experience, in technical scheme, the restriction to target value is actually to the restriction of all temps, between temperature actual value and target value, there is the deviation in allowed band.But, contriver finds in practice, for thickness for the Thin Specs pickled hot steel plate of below 2.0mm, because its rapid heat dissipation, temperature drop are large, make the deviation between its temperature actual value and target value maximum up to 20 DEG C, and the Thin Specs pickled hot steel plate of this existing explained hereafter just exists the major cause of various defect: thin specification steel plate causes greatly its finishing temperature not reach cooling controlling and rolling controlling process design requirements because of temperature drop, be easy to cause finishing rolling step rolled piece reality to be rolled in two-phase region.
Contriver is going deep in practical studies, start with from steel grades, reduce steel grade phase point temperature by every means to expand rolling window, promote workpiece thickness to reduce rate of heat release as far as possible, set suitable continuous casting steel billet Heating temperature, roughing end temp, finish rolling end temp, hot-rolling coiling temperature etc. to assist simultaneously, thus guarantee that Thin Specs pickled hot steel plate finishing temperature reaches cooling controlling and rolling controlling process design requirements, guarantee that finishing rolling step rolled piece is in the rolling of austenite one phase district.In addition, contriver also specialized in adapt with the present invention hot-rolled steel sheet convexity range set, the setting of pickling drawing-correcting and all the other processing steps, to guarantee that steel plate has good plate shape effect, suitable strength range, good forming property index and excellent anti-enamel fish scaling performance.
Comprehensive above-mentioned improvements, the present invention can effectively obtain can thoroughly avoid punching press wrinkling/cracking, the Thin Specs pickled hot steel plate of the defect such as burst porcelain after suddenly big or suddenly small, the enamel in volume circle forming open degree gap.Meanwhile, the present invention obtains the cold-reduced sheet effect that steel plate can reach same thickness specification, can be suitable for enamel inner container ladle body and the requirement of end socket manufacture craft simultaneously, can with hot rolling acid-cleaning products substitution cold-rolled products.
Accompanying drawing explanation
Fig. 1 is the microstructure metallograph that the present invention obtains steel plate.
Fig. 2 is the enamel adherence detected result figure that the present invention obtains steel plate.
Fig. 3 is finishing temperature control curve of the present invention.
Embodiment
With 4 embodiments, the present invention is described in detail below, but the invention is not restricted to given example.
The present invention obtains the microstructure metallograph of steel plate as shown in Figure 1, and its microstructure is the perlite of ferrite+a small amount of, organizes grain size number to be 8 ~ 10 grades; As shown in Figure 2, result is adherence 1 grade to enamel adherence detected result, namely well; Finishing temperature control curve as shown in Figure 3.
Each embodiment adopts the processing step consistent with summary of the invention manufacture method.Wherein, the first step gained composition of each embodiment is as shown in table 1, and main technologic parameters is as shown in table 2, and mechanical property is as shown in table 3.
Table 1 composition (Wt%)
The surplus noting each embodiment is Fe and inevitable impurity.
Table 2 main technologic parameters
Table 3 mechanical property
| Performance index | Yield strength/MPa | Tensile strength/MPa | Elongation after fracture A/% |
| Coverage pattern of the present invention | 330－450 | 400－520 | ≥22 |
| Embodiment 1 | 390 | 510 | 36.5 |
| Embodiment 2 | 420 | 485 | 39 |
| Embodiment 3 | 380 | 480 | 37 |
| Embodiment 4 | 400 | 520 | 42 |
As from the foregoing, the Thin Specs pickled hot steel plate that each embodiment obtains has good plate shape effect, suitable strength range, good forming property index and excellent anti-enamel fish scaling performance, can thoroughly avoid punching press wrinkling/cracking, the defect such as burst porcelain after suddenly big or suddenly small, the enamel in volume circle forming open degree gap, enamel inner container ladle body and the requirement of end socket manufacture craft can be suitable for simultaneously, can with hot rolling acid-cleaning products substitution cold-rolled products.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (7)
1. an enamel internal container of water-heater Thin Specs hot rolling acid-cleaning steel plate, it is characterized in that, be made up of by weight percentage following chemical composition: C 0.03 ~ 0.09%, Si 0.005 ~ 0.035%, Mn 0.40 ~ 0.80%, P≤0.018%, S≤0.014%, N≤0.0050%, Al 0.002 ~ 0.055%, Ti 0.03 ~ 0.06%, Cu 0.03 ~ 0.06%, surplus is iron and inevitable impurity; The thickness of described steel plate is 1.5-2.0mm; The yield strength of described steel plate is 330-450Mpa, and tensile strength is 400 ~ 520Mpa, elongation after fracture >=22%; The main microstructure of described steel plate is ferrite, secondary microstructure is perlite, and the grain size number of organizing of described steel plate is 8 ~ 10 grades.
2. an enamel internal container of water-heater manufacture method for Thin Specs hot rolling acid-cleaning steel plate, is characterized in that, comprise the following steps:
The first step, molten steel is carried out refining treatment, it is made to be made up of by weight percentage following chemical composition: C 0.03 ~ 0.09%, Si 0.005 ~ 0.035%, Mn 0.40 ~ 0.80%, P≤0.018%, S≤0.014%, N≤0.0050%, Al 0.002 ~ 0.055%, Ti 0.03 ~ 0.06%, Cu 0.03 ~ 0.06%, surplus is iron and inevitable impurity;
Second step, the first step gained molten steel is carried out continuous casting obtain continuous casting steel billet; By continuous casting steel billet in 1200 DEG C ~ 1220 DEG C heating;
3rd step, second step gained slab is carried out hot rolling, described hot rolling adopts the two-part rolling technology be made up of roughing and finish rolling; Described roughing is 5 passage tandem rollings, and roughing end temp is 980 DEG C ~ 1030 DEG C, workpiece thickness >=36mm after roughing; Described finish rolling is 7 passage tandem rollings, and in the rolling of austenite one phase district, finish rolling end temp is 810 DEG C ~ 860 DEG C, rolling draft >=90% of finish rolling; At the end of finish rolling, control steel plate thickness is 1.5-2.0mm and plate crown is 20-40 μm;
4th step, the 3rd step gained steel plate is carried out section cooling, described section cooling adopts the back segment type of cooling; Coil of strip is coiled at coiling temperature 600 DEG C ~ 660 DEG C; Improve steel-plate shape through pickling drawing-correcting, control straightening unit elongation is 0.8-1.5% simultaneously; Get product, the yield strength of described finished product is 330-450Mpa, and tensile strength is 400 ~ 520Mpa, elongation after fracture >=22%; The main microstructure of described steel plate is ferrite, secondary microstructure is perlite, and the grain size number of organizing of described steel plate is 8 ~ 10 grades.
3. manufacture method according to claim 2, it is characterized in that, in the 3rd step, after roughing, workpiece thickness is 36mm or 38mm.
4. manufacture method according to claim 2, it is characterized in that, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.086%, Si 0.033%, Mn 0.67%, P 0.012%, S 0.006%, N 0.0035%, Al 0.004%, Ti 0.041%, Cu 0.051%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1218 DEG C; In 3rd step, roughing end temp is 1015 DEG C, and after roughing, workpiece thickness is 38mm, and finish rolling end temp is 857 DEG C, at the end of finish rolling, and control steel plate thickness is 1.5mm and plate crown is 23 μm; Coiling temperature 640 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 390Mpa, and tensile strength is 510Mpa, and elongation after fracture is 36.5%.
5. manufacture method according to claim 2, it is characterized in that, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.051%, Si 0.027%, Mn 0.74%, P 0.009%, S 0.012%, N 0.0015%, Al 0.006%, Ti 0.050%, Cu 0.036%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1210 DEG C; In 3rd step, roughing end temp is 1005 DEG C, and after roughing, workpiece thickness is 38mm, and finish rolling end temp is 820 DEG C, at the end of finish rolling, and control steel plate thickness is 1.7mm and plate crown is 31 μm; Coiling temperature 630 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 420Mpa, and tensile strength is 485Mpa, and elongation after fracture is 39%.
6. manufacture method according to claim 2, it is characterized in that, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.066%, Si 0.030%, Mn 0.50%, P 0.015%, S 0.014%, N 0.0029%, Al 0.049%, Ti 0.035%, Cu 0.042%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1208 DEG C; In 3rd step, roughing end temp is 1000 DEG C, and after roughing, workpiece thickness is 36mm, and finish rolling end temp is 837 DEG C, at the end of finish rolling, and control steel plate thickness is 1.8mm and plate crown is 38 μm; Coiling temperature 620 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 380Mpa, and tensile strength is 480Mpa, and elongation after fracture is 37%.
7. manufacture method according to claim 2, it is characterized in that, the first step gained molten steel is made up of by weight percentage following chemical composition: C 0.031%, Si 0.009%, Mn 0.61%, P 0.014%, S 0.007%, N 0.0031%, Al 0.037%, Ti 0.038%, Cu 0.045%, surplus is iron and inevitable impurity; In second step, Heating temperature is 1204 DEG C; In 3rd step, roughing end temp is 990 DEG C, and after roughing, workpiece thickness is 36mm, and finish rolling end temp is 840 DEG C, at the end of finish rolling, and control steel plate thickness is 2.0mm and plate crown is 29 μm; Coiling temperature 600 DEG C in 4th step, straightening unit elongation is 1.2%, and gained finished product yield strength is 400Mpa, and tensile strength is 520Mpa, and elongation after fracture is 42%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410367309.4A CN105316579B (en) | 2014-07-29 | 2014-07-29 | Thin hot rolled pickled steel plate and fabrication method thereof for water heater enamel liner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410367309.4A CN105316579B (en) | 2014-07-29 | 2014-07-29 | Thin hot rolled pickled steel plate and fabrication method thereof for water heater enamel liner |
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| CN107338395A (en) * | 2017-07-13 | 2017-11-10 | 武汉钢铁有限公司 | 450MPa levels hot rolling low yield strength ratio paper-thin strip and its manufacture method |
| CN108714624A (en) * | 2018-04-26 | 2018-10-30 | 首钢京唐钢铁联合有限责任公司 | A kind of processing method of carbon aluminium-killed steel acid-cleaning plate |
| CN108998740A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of water heater liner bracket hot rolling acid-cleaning strip and its production method |
| CN110284070A (en) * | 2019-07-30 | 2019-09-27 | 马鞍山钢铁股份有限公司 | A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method |
| CN110553402A (en) * | 2018-06-04 | 2019-12-10 | 上海梅山钢铁股份有限公司 | Method for preventing oxide scale on outer surface of enamel steel liner of water heater from falling off |
| CN110863136A (en) * | 2018-08-27 | 2020-03-06 | 上海梅山钢铁股份有限公司 | High-hole-expansion-performance hot rolled steel plate for enamel liner of water heater and manufacturing method thereof |
| CN111659734A (en) * | 2020-06-09 | 2020-09-15 | 首钢集团有限公司 | Control method for surface pockmark defects of thin pickled plate |
| CN113102498A (en) * | 2021-03-31 | 2021-07-13 | 北京首钢股份有限公司 | Method for improving dimensional accuracy of steel for compressor shell |
| CN114182182A (en) * | 2020-09-14 | 2022-03-15 | 上海梅山钢铁股份有限公司 | Hot-rolled pickled steel plate for refrigerator compressor shell and manufacturing method thereof |
| 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 |
| WO2023088294A1 (en) * | 2021-11-16 | 2023-05-25 | 宝山钢铁股份有限公司 | Hot-rolled steel for enameling having enameling and firing strengthening property, and manufacturing method therefor |
| WO2023093798A1 (en) * | 2021-11-25 | 2023-06-01 | 宝山钢铁股份有限公司 | High-strength cold-rolled steel plate for double-sided enamel liner and method for manufacturing same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107338395A (en) * | 2017-07-13 | 2017-11-10 | 武汉钢铁有限公司 | 450MPa levels hot rolling low yield strength ratio paper-thin strip and its manufacture method |
| CN107338395B (en) * | 2017-07-13 | 2019-06-07 | 武汉钢铁有限公司 | 450MPa grades of hot rolling low yield strength ratio paper-thin strips and its manufacturing method |
| CN108714624A (en) * | 2018-04-26 | 2018-10-30 | 首钢京唐钢铁联合有限责任公司 | A kind of processing method of carbon aluminium-killed steel acid-cleaning plate |
| CN110553402B (en) * | 2018-06-04 | 2021-07-09 | 上海梅山钢铁股份有限公司 | Method for preventing oxide scale on outer surface of enamel steel liner of water heater from falling off |
| CN110553402A (en) * | 2018-06-04 | 2019-12-10 | 上海梅山钢铁股份有限公司 | Method for preventing oxide scale on outer surface of enamel steel liner of water heater from falling off |
| CN108998740A (en) * | 2018-08-01 | 2018-12-14 | 首钢集团有限公司 | A kind of water heater liner bracket hot rolling acid-cleaning strip and its production method |
| CN110863136A (en) * | 2018-08-27 | 2020-03-06 | 上海梅山钢铁股份有限公司 | High-hole-expansion-performance hot rolled steel plate for enamel liner of water heater and manufacturing method thereof |
| CN110284070A (en) * | 2019-07-30 | 2019-09-27 | 马鞍山钢铁股份有限公司 | A kind of 260MPa rank hot rolling acid-cleaning glassed steel and its production method |
| CN111659734A (en) * | 2020-06-09 | 2020-09-15 | 首钢集团有限公司 | Control method for surface pockmark defects of thin pickled plate |
| CN111659734B (en) * | 2020-06-09 | 2022-03-22 | 首钢集团有限公司 | Control method for surface pockmark defects of thin pickled plate |
| CN114182182A (en) * | 2020-09-14 | 2022-03-15 | 上海梅山钢铁股份有限公司 | Hot-rolled pickled steel plate for refrigerator compressor shell and manufacturing method thereof |
| 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 |
| CN113102498A (en) * | 2021-03-31 | 2021-07-13 | 北京首钢股份有限公司 | Method for improving dimensional accuracy of steel for compressor shell |
| WO2023088294A1 (en) * | 2021-11-16 | 2023-05-25 | 宝山钢铁股份有限公司 | Hot-rolled steel for enameling having enameling and firing strengthening property, and manufacturing method therefor |
| WO2023093798A1 (en) * | 2021-11-25 | 2023-06-01 | 宝山钢铁股份有限公司 | High-strength cold-rolled steel plate for double-sided enamel liner and method for manufacturing same |
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