CN102181805A - Steel plate and method thereof used for producing water heater linear enamel by flexible thin slab rolling line - Google Patents
Steel plate and method thereof used for producing water heater linear enamel by flexible thin slab rolling line Download PDFInfo
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Abstract
The invention relates to a steel plate and a process method thereof used for producing water heater linear enamel by a flexible thin slab rolling line (FTSR), belonging to the production field of enamel steel plates. The steel plate comprises the following chemical components in percentage by weight: 0.03-0.10wt% of carbon, 0.15-0.40wt% of manganese, less than or equal to 0.06wt% of silicon, 0.004-0.040wt% of sulphur, less than or equal to 0.15wt% of phosphorus, 0.03-0.05wt% of aluminum, 0.002-0.008wt% of nitrogen, 0.02-0.10wt% of titanium and the balance of ferrum and inevitable impurities. The tissue of the water heater linear enamel contains fine grain ferrite and a small quantity of pearlite tissues, and the granularity level of the water heater linear enamel is more than or equal to 10 levels. According to reasonable ingredient design and the FTSR process, steel for manufacturing water-storage water heater linear enamel for home appliances is produced; the steel plate has good enamel adhesion and scaling resistance, and also has the characteristics of few added alloy elements, few production working procedures, low production cost and the like; and a hot rolling scouring plate is used for replacing a cold rolling annealing plate.
Description
Technical field
The present invention provides a kind of CSP line to produce water heater liner enamel sheet and method especially, particularly produce the processing method of water heater liner enamel, belong to enamel steel technical field with hot-rolled steel sheet at the FTSR sheet billet continuous casting and rolling production line.
Background technology
Enamel has purposes widely with steel in people's life.In order to guarantee good cold formability and enamel property, the enamel of producing water heater liner generally uses the low-carbon cold rolling annealed sheet with steel, in its production technique, steel plate carries out anneal after will passing through hot rolling, cold-rolling treatment again, the enamel of being produced is with steel intensity (general yield strength≤200MPa) on the low side not only, and production process is many, production cost is high, causes tame electric water heater enterprise purchasing of raw materials cost to rise, and household appliances enterprise's synthesized competitiveness descends.For the good enamel steel of obtained performance, usually in steel, add a certain amount of titanium, by with steel in carbon form compound and separate out, and titanium/carbonaceous amount per-cent reach certain value when above steel plate just have scaling resistance, because it is big to add the alloying element amount, the production cost height.And not the common carbon manganese of addition element be acid-cleaning plate when making water heater liner enamel, the quality instability often takes place fish-scaling effect.Therefore the enamel industry need a kind of production cost low, be easy to produce the steel plate that enamel property is good.
Summary of the invention
The purpose of this invention is to provide a kind of CSP line and produced water heater liner enamel sheet and method, produce water heater liner enamel hot-rolled steel sheet at the FTSR sheet billet continuous casting and rolling production line, with rational composition design and the hot rolling acid-cleaning steel plate that adopts FTSR CSP production technique to make, in order to make household electrical appliances storage water heater's inner bag, have good enamel adherence and scaling resistance, and has the alloying element adding less, production cost is low, hot rolling acid-cleaning plate substitutes characteristics such as cold rolled annealed plate, solves the problems referred to above that background technology exists.
Technical scheme of the present invention is:
A kind of CSP line is produced the water heater liner enamel sheet, its composition quality per-cent is: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities; Its water heater liner enamel structure of steel is close grain ferrite+a small amount of pearlitic structure, grain size number 〉=10 grade.
The FTSR process quilt is called the handiness thin slab rolling technology of producing high-quality product, is a kind of continuous casting and rolling technique of sheet bar of Italian Danieli Off Mecc exploitation.A kind of CSP line is produced water heater liner enamel sheet method; produce water heater liner enamel hot-rolled steel sheet at the FTSR sheet billet continuous casting and rolling production line; comprise and protect cast, continuous casting and rolling, controlled rolling and controlled chilling, smooth, pickling flattening process step again in molten iron pre-desulfurization and phosphorus, converter top bottom blowing, LF stove deep deoxidation and Argon control, the casting process, its special feature is:
1. smelting molten steel, its composition quality per-cent is: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities;
2. above-mentioned molten steel carries out continuous casting after LF stove refining treatment, pour into the thick thin slab of 70mm;
3. the thin slab behind the continuous casting directly enters soaking in the roller bottom type soaking pit, the steel billet temperature charging temperature remains on more than 900 ℃, 1050 ℃-1200 ℃ of soaking temperatures, thin slab after the soaking directly enters roughing tandem rolling unit, by high temperature deformation, makes the austenite structure refinement, its roughing draft reaches 50-80%, thereafter enter 5 rolling finishing mill group controlled rollings, the pony-roughing pass draft is 15-30%, finishing temperature 820-900 ℃; Finish to gauge is after layer cold line leading portion or back segment water-cooled to rolling the controlled chilling that the back steel plate carries out the upper and lower surface twocouese, satisfy curling temperature 550-720 ℃ processing requirement;
4. the coil of strip after the hot rolling naturally cool to≤carry out after below 60 ℃ smooth, smooth draft≤1%;
5. it is smooth again that the coils of hot-rolled steel after smooth carries out continuous pickling by continuous pickling-flat line, the smooth total draft in smooth draft≤1%, twice≤2%.
The present invention is directed to characteristics that FTSR CSP line produces and water heater liner enamel performance requriements, on the composition of steel and producing and manufacturing technique, take following technical scheme steel plate:
1, steel adds an amount of manganese and a spot of titanium in converter smelting and LF stove refining process, controls the scope of sulphur and nitrogen in the steel simultaneously, and the nitrogen of separating out when making titanium in the steel mainly with high temperature and the compound of sulphur are (as TiN and Ti
2S) be main, and the less titanium carbide that exists low temperature to separate out, because the atomic ratio of titanium and nitrogen, sulphur, carbon is respectively: Ti/N=3.42, Ti/S=1.5, Ti/C=4, when the span of control of sulphur and nitrogen is respectively sulphur 0.004-0.040%, during nitrogen 0.002-0.008%, the amount that is completely fixed the required titanium of sulphur and nitrogen by formula Ti=3.42N+1.5S is calculated as 0.013-0.082%, conform to the span of control 0.02-0.10% of titanium among the present invention, unnecessary titanium can carry out chemical combination with the carbon in the steel, separates out a certain amount of TiC particle in the cooling control after rolling stage;
2, critical process controlling of production process.In smelting, refining process, to the control of major ingredient, auxiliary material quality; Add ferrotianium after the abundant deoxidation of molten steel in the refining process, control adds oxygen activity and the sulphur massfraction in the preceding molten steel of titanium, thereby effectively stablizes the rate of recovery of titanium in the ferrotianium, thereby effectively controls the content of hydrogen in the molten steel, improves the scaling resistance of steel plate;
3, steel is the thin slab that converter smelting, the refining of LF stove, continuous caster are pulled out is directly packed the roller bottom type soaking pit into by roller-way in, the steel billet temperature charging temperature remains on more than 900 ℃, depress the continuous rolling process light plate greatly at hot slab and be in the condition of high temperature always, guaranteed that titanium and nitrogen, sulphur are separated out at the abundant chemical combination of the condition of high temperature in the steel, and under the condition of high temperature carbon in the steel and titanium in a large number chemical combination separate out (a titanium carbide 600-700 ℃ scope is separated out in a large number).Therefore produce in the production technique of water heater liner enamel sheet at whole FTSR CSP line, owing to there is not the process of cold drawing base reheat, avoided separating out of carbonization at low temperature titanium in the continuously cast bloom natural cooling process, the macrobead titanium carbide can not fully dissolve and influences TiN and Ti under the slab condition of high temperature behind the reheat
2The eduction rate of S, and then the scaling resistance of reduction steel plate;
4, separate out with small and dispersed by nitrogen, sulphur, the carbide of controlled rolling and controlled chilling control titanium, obtain to roll back compact grained ferrite+pearlitic structure simultaneously, and obtain the interior more ferrite grain boundary area of unit surface in the steel, improve the scaling resistance energy of steel plate;
5, when certain draft, form the small hole of some amount around the second phase particle of the surface of steel plate after smooth, simultaneously that the iron scale of surface of steel plate is effectively broken, for improving, the pickled surface quality creates favorable conditions;
6, the application of continuous pickling-flat line on enamel sheet is produced.Remove the iron scale of surface of steel plate after pickling, obtain the good steel plate of surface quality, it is smooth that the while is carried out one-time continuous again, improves the plate shape of steel plate; The small hole of the some amount that forms around the second phase particle of surface of steel plate existence simultaneously, when certain smooth draft, the small hole total area increases, and has improved the hydrogen storage capacity of surface of steel plate, and then the adherence between raising enamel layer and steel matrix and the scaling resistance energy of steel plate.
The purpose of technique scheme is, be met steel plate with certain intensity and plasticity requirement, scope by carbon and manganese in definite steel, add a spot of alloying element titanium, and an amount of sulphur and the scope of nitrogen in the control steel, the nitrogen of separating out when making titanium in the steel mainly with high temperature and the compound of sulphur are (as TiN and Ti
2S) be main, controlled rolling and roll the back controlled cooling technology, remaining dissolving titanium is separated out carbon compound TiC after making the condition of high temperature separate out the compound of nitrogen and sulphur when low temperature, guarantee to generate in the steel tiny simultaneously and the second phase particle of disperse, and compact grained ferrite and a small amount of pearlitic structure; Control smooth total draft≤2% twice, improve plate shape, broken surface of steel plate iron scale, the surface quality of steel plate after effective assurance pickling, form the small hole of some amount simultaneously around the second phase particle of surface of steel plate, the adherence between raising enamel layer and steel matrix and the scaling resistance energy of steel plate.
Process characteristic of the present invention: in smelting, refining process, to the control of major ingredient, auxiliary material quality; Add ferrotianium after the abundant deoxidation of molten steel in the refining process, control adds oxygen activity and the sulphur massfraction in the preceding molten steel of titanium, thereby effectively stablizes the rate of recovery of titanium in the ferrotianium, thereby effectively controls the content of hydrogen in the molten steel, improves the scaling resistance of steel plate; Adopt FTSR continuous casting and rolling technique of sheet bar technology, thickness is that 70 millimeters thin slab is directly packed in the roller bottom type soaking pit by roller-way behind the continuous casting, the steel billet temperature charging temperature remains on more than 900 ℃, 1050 ℃-1200 ℃ of soaking temperatures, depress the continuous rolling process light plate greatly at hot slab and be in the condition of high temperature always, guaranteed that titanium and nitrogen, sulphur are separated out at the abundant chemical combination of the condition of high temperature in the steel, and under the condition of high temperature carbon in the steel and titanium in a large number chemical combination separate out (a titanium carbide 600-700 ℃ scope is separated out in a large number); Thin slab after the soaking directly enters two and depresses roughing tandem rolling unit greatly, by the high temperature gross distortion, makes the austenite structure refinement, its roughing draft reaches 50-80%, thereafter enter 5 rolling finishing mill group controlled rollings, the pony-roughing pass draft is 15-30%, finishing temperature 820-900 ℃; Finish to gauge after layer cold line leading portion or back segment water-cooled to rolling the controlled chilling that the back steel plate carries out the upper and lower surface twocouese, curling temperature is 550-720 ℃.
Steel plate mechanical property after the pickling is tensile strength R
m〉=350Mpa, yield strength Rp0.2 〉=250 Mpa extends A50 〉=38%.
The present invention is directed to water heater liner enamelled characteristics and,, rationally control steel interalloy element, by in steel, adding a spot of titanium, and control the scope of an amount of sulphur and nitrogen in conjunction with the characteristics that the FTSR sheet billet continuous casting and rolling production line is produced to the requirement of steel plate.Because the character of titanium elements is active,, from high temperature to low temperature, separates out order and be followed successively by: Ti according to the free energy of chemistry difference that precipitate forms
2O
3→ TiN → Ti
2S → TiC, therefore, in LF stove refining process, abundant an amount of titanium, nitrogen, the sulphur of control after the deoxidation makes titanium in the steel mainly with TiN and Ti
2The form of S is separated out, and seldom exists high temperature to separate out product Ti
2O
3The TiC that separates out during with low temperature.Molten steel surface covers in the continuous-casting sheet billet process, avoids the excessive molten steel nitrogen pick-up that causes, and influences the strengthening effect of Ti in hot rolling and the process of cooling.Thin slab behind the continuous casting directly enters the controlled rolling of heavy reduction rate hot continuous rolling unit after directly entering the soaking of roller bottom type soaking pit, nitrogen, sulphur compound by above technology controlling and process titanium are separated out with the form of small and dispersed, by the finish to gauge controlled temperature and roll the back controlled chilling, control titanium carbon compound separate out with the form of small and dispersed.The nitride of these titaniums, sulfide, carbide mainly contain following effect: strengthen the effect of matrix, improve the quick-fried effect of anti-squama.By the cooling control technology after rolling; the curling temperature of control; helping the TiC nanoparticle fully separates out; bring into play significant precipitation strength effect; the yield strength and the tensile strength of steel plate all improve a lot, and the metallographic structure of steel plate is that thin ferrite adds pearlitic structure, and grain fineness number reaches more than 10 grades; the close grainization of steel plate tissue makes steel plate have good plasticity, than the grain size number raising 1-2 level of common enamel with steel.By the ferrite crystal grain refinement, ferritic grain boundary area is increased relatively, the storage hydrogen trap increases between crystal boundary, and the scaling resistance of steel plate can improve.Steel plate is after smooth and pickling, and steel plate produces the unit elongation less than 1%, produces a certain amount of slight void around the second phase particle that surface of steel plate is separated out, and improves the scaling resistance energy of steel plate when helping improving the enamelled adherence.
Beneficial effect of the present invention: in carbon manganese steel, add a spot of alloying element titanium, by adopting FTSR CSP production technique, the whole process mode of production of controlled rolling and controlled cooling technology, smooth, pickling has realized that the enameling sheet of being produced has than common acid-cleaning plate higher yield strength, tensile strength, good plasticity, enamel adherence and scaling resistance; Compare with cold rolled annealed enamel sheet, it is low to have a production cost, the advantage that production process is few.
Embodiment:
By the following examples, the invention will be further described.
A kind of CSP line is produced the water heater liner enamel sheet, its composition quality per-cent is: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities; Its water heater liner enamel structure of steel is close grain ferrite+a small amount of pearlitic structure, grain size number 〉=10 grade.
The chemical ingredients of 6 embodiment of the present invention is referring to table 1:
A kind of CSP line is produced water heater liner enamel sheet method; produce water heater liner enamel hot-rolled steel sheet at the FTSR sheet billet continuous casting and rolling production line; comprise and protect cast, continuous casting and rolling, controlled rolling and controlled chilling, smooth, pickling flattening process step again in molten iron pre-desulfurization and phosphorus, converter top bottom blowing, LF stove deep deoxidation and Argon control, the casting process, its special feature is:
1. smelting molten steel, its composition quality per-cent is: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities;
2. above-mentioned molten steel carries out continuous casting after LF stove refining treatment, pour into the thick thin slab of 70mm;
3. the thin slab behind the continuous casting directly enters soaking in the roller bottom type soaking pit, the steel billet temperature charging temperature remains on more than 900 ℃, 1050 ℃-1200 ℃ of soaking temperatures, thin slab after the soaking directly enters roughing tandem rolling unit, by high temperature deformation, makes the austenite structure refinement, its roughing draft reaches 50-80%, thereafter enter the controlled rolling of finish rolling tandem rolling unit, the pony-roughing pass draft is 15-30%, finishing temperature 820-900 ℃; Finish to gauge is after layer cold line leading portion or back segment water-cooled to rolling the controlled chilling that the back steel plate carries out the upper and lower surface twocouese, satisfy curling temperature 550-720 ℃ processing requirement;
4. the coil of strip after the hot rolling naturally cool to≤carry out after below 60 ℃ smooth, smooth draft≤1%;
5. it is smooth again that the coils of hot-rolled steel after smooth carries out continuous pickling by continuous pickling-flat line, the smooth total draft in smooth draft≤1%, twice≤2%.
6 embodiment main technique point control parameters see Table 2:
Finished product volume mechanical property and grain fineness number see Table 3 after the pickling
Annotate: 1 to 6 in the table 1,2,3 among the embodiment is one-to-one relationship.
Every composition from above-mentioned table 1 to table 3, processing parameter performance are as can be seen, characteristics in conjunction with the production of FTSR sheet billet continuous casting and rolling production line, rationally control steel interalloy element, by in steel, adding a spot of titanium, and control the scope of an amount of sulphur and nitrogen, obtained satisfying the steel plate of water heater liner enamel requirement.Compare with common cold rolled annealed steel plate, on tensile strength, yield strength, improve a lot, have good unit elongation simultaneously.The composition of steel is reasonable in design, and steel is reasonable in smelting, refining, FTSR CSP production technique, easy handling, and production cost is low.Use through water heater porcelain enamel producer, steel plate can satisfy the requirement of enamel inner container at aspects such as mechanical property, welding property, enamel adhesion property, enamel scaling resistance energy.
Claims (4)
1. a CSP line is produced the water heater liner enamel sheet, it is characterized in that: the chemical ingredients of this steel is by mass percentage: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities.
2. produce the water heater liner enamel sheet according to the described CSP line of claim 1, it is characterized in that said structure of steel is close grain ferrite+a small amount of pearlitic structure, grain size number 〉=10 grade.
3. a CSP line is produced water heater liner enamel sheet method, produce water heater liner enamel hot-rolled steel sheet at the FTSR sheet billet continuous casting and rolling production line, comprise molten iron pre-desulfurization and phosphorus, the converter top bottom blowing, LF stove deep deoxidation and Argon control, protection cast in the casting process, continuous casting and rolling, controlled rolling and controlled chilling, smooth, pickling is the flattening process step again, it is characterized in that: 1. smelting molten steel, its composition quality per-cent is: carbon 0.03-0.10, manganese 0.15-0.40, silicon≤0.06, sulphur 0.004-0.040, phosphorus≤0.15, aluminium 0.03-0.05, nitrogen 0.002-0.008, titanium 0.02-0.10, all the other are iron and unavoidable impurities;
2. above-mentioned molten steel carries out continuous casting after LF stove refining treatment, pour into the thick thin slab of 70mm;
3. the thin slab behind the continuous casting directly enters soaking in the roller bottom type soaking pit, the steel billet temperature charging temperature remains on more than 900 ℃, 1050 ℃-1200 ℃ of soaking temperatures, thin slab after the soaking directly enters roughing tandem rolling unit, by high temperature deformation, makes the austenite structure refinement, its roughing draft reaches 50-80%, thereafter enter the controlled rolling of finish rolling tandem rolling unit, the pony-roughing pass draft is 15-30%, finishing temperature 820-900 ℃; Finish to gauge is after layer cold line leading portion or back segment water-cooled to rolling the controlled chilling that the back steel plate carries out the upper and lower surface twocouese, satisfy curling temperature 550-720 ℃ processing requirement;
4. the coil of strip after the hot rolling naturally cool to≤carry out after below 60 ℃ smooth, smooth draft≤1%;
5. it is smooth again that the coils of hot-rolled steel after smooth carries out continuous pickling by continuous pickling-flat line, the smooth total draft in smooth draft≤1%, twice≤2%.
4. produce water heater liner enamel sheet method according to the described CSP line of claim 3, it is characterized in that: the steel plate mechanical property after the pickling is tensile strength R
m〉=350Mpa, yield strength Rp0.2 〉=250 Mpa extends A50 〉=38%.
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