CN100473740C - Soft tin-plate of hardness HR30T 51+/-3 and making process thereof - Google Patents

Soft tin-plate of hardness HR30T 51+/-3 and making process thereof Download PDF

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CN100473740C
CN100473740C CNB200510027290XA CN200510027290A CN100473740C CN 100473740 C CN100473740 C CN 100473740C CN B200510027290X A CNB200510027290X A CN B200510027290XA CN 200510027290 A CN200510027290 A CN 200510027290A CN 100473740 C CN100473740 C CN 100473740C
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controlled
plate
tin
temperature
steel
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CNB200510027290XA
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CN1888113A (en
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李俊
林秀贞
张理扬
金仁忠
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宝山钢铁股份有限公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/004Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/14Ferrous alloys, e.g. steel alloys containing titanium or zirconium

Abstract

The soft tin-plate of hardness HR30T 51+/-3 consists of C not more than 0.005 wt%, Mn 0.20-0.30 wt%, Al 0.03-0.06 wt%, Si not more than 0.03 wt%, Ti 0.03-0.06 wt%, P not more than 0.012 wt%, S not more than 0.015 wt%, N not more than 0.003 wt%, O not more than 0.004 wt%, and Fe and inevitable impurities for the rest. Its production process includes the following steps: smelting steel, continuous casting and rolling, hot rolling, acid pickling and rolling, continuous annealing, flattening and tin plating.

Description

Soft tin-plate and the manufacture method thereof of hardness HR30T in 51 ± 3
Technical field
The present invention relates to soft tin-plate and manufacture method thereof, be particularly related to soft tin-plate and the manufacture method thereof of hardness HR30T within 51 ± 3, this soft tin-plate adopts the method production of titanium-IF steel continuous annealing, be mainly used in production hole enlargement gaily decorated basket bucket, the jar of cover that distortion is complicated and punching press distortion.
Background technology
The production technology of tin plate is comparatively ripe and known, and along with the expansion of tin plate use range, the hard tinned plate with the soft tin-plate of excellent formability energy and thin specification has become two main directions of its development.
According to the JIS G3303 of Japanese Industrial Standards, the durometer level of different stage tin plate is as shown in table 1.Wherein T-1 is a soft tin-plate to T-3, and T-4 is a hard tinned plate to T-6.
The durometer level of table 1 different stage tin plate
Rank The HR30T durometer level
T-1 49±3
T-2 53±3
T-2.5 55±3
T-3 57±3
T-4 61±3
T-5 65±3
T-6 70±3
At present, the production of soft tin-plate mainly contains two kinds of approach, and a kind of is to adopt carbon aluminium-killed steel production; Another kind is to adopt the IF steel that adds niobium (Nb) to produce.
NKK Corp on March 19th, 1996 disclosed spy open among the flat No.JP873943 method that adopts carbon aluminium-killed steel to produce tin plate.But this method not only need be carried out ageing treatment by reheat after cooling off fast, and product has tangible aging performance, its product hardness is higher relatively, properties for follow is also relatively poor, under the condition of aximal deformation values such as deep-draw, big hole enlargement, aggressive bend, be easy to occur cracking, produce defectives such as slip line reticulate pattern or curved surface barring.And, adopt carbon aluminium-killed steel to be not suitable for producing very soft tin plate.
Along with the progress of IF steel production technology, IF steel inherent favorable forming property and ageing resistance performance make the show strong market competitiveness of IF steel tin-plated product.NKK Corp in August 1 nineteen ninety-five disclosed spy open flat No.JP7197192 and disclose a kind of employing and add soft tin-plate and the manufacture method thereof that the IF steel of niobium (Nb) is produced.The soft tin-plate that this patent is produced adopts following chemical ingredients: C :≤0.004%, and Mn :≤0.6%, Al:0.03~0.10%, N≤0.004%, Nb:0.021~0.050%, and the atomic quantity of Nb and C is than greater than 1.0.What this patent adopted is niobium-IF steel, and the content of Nb element has all been proposed clear and definite requirement.But, because niobium-IF steel is to the processing parameter sensitivity, particularly to the hot-rolled process parameter sensitivity, make the product performance instability, and its recrystallization temperature height, required annealing temperature height, when the production of organizing this product, need to use more transition material and long transit time, be easy to generate the bent even generation broken belt of wooden dipper when particularly in continuous annealing furnace, producing this product, thereby logical plate poor performance, heat energy consumption simultaneously is big, add that alloying elements nb costs an arm and a leg, so its production cost is higher relatively.In addition, niobium-IF steel plasticity is poor, though anisotropy is little, its overall mechanical property is poor than titanium-IF steel.At last, niobium has certain radioactivity when exploitation and smelting, and whether the tin plate (being mainly used in food service industry) that adds niobium is harmful yet disputable.
Simultaneously; although adopting, this patent disclosure explanation between 600 ℃~800 ℃, batches steel plate; but this coiling temperature upper limit is obviously too high; can't carry out actually operating; the coiling temperature scope that this patent is protected is obviously unreasonable, because when batching near 800 ℃, the steel plate oxidation is serious; not only influence the pickling speed of back operation, and can influence the surface quality of the finished product.In addition; although annealing between 670 ℃~800 ℃ is adopted in this patent disclosure explanation; but because this patent employing is that niobium IF steel is produced soft tin-plate; in the given annealing region of this patent during near 670 ℃ of annealing (for example 670 ℃~740 ℃); steel plate is difficult under the normal unit speed and finishes recrystallize; promptly can not produce qualified soft tin-plate, therefore, the annealing region that this patent is protected is also obviously unreasonable.
And in recent years, the user is in great demand to the tin plate of hardness HR30T within 51 ± 3, and the thickness specification has from 0.17mm to 0.55mm.Because thickness specification variation range is big, its hardness is difficult to stable being controlled within 51 ± 3.For this reason, the invention provides a kind of the stable soft tin-plate production method that is controlled within 51 ± 3 of product hardness HR30T, because this durometer level is between T-1CA and T-2CA, so can be described as T-1.5CA.
Summary of the invention
The purpose of this invention is to provide a kind of use titanium-IF steel continuous annealing and produce the manufacture method of soft tin-plate, the hardness HR30T scope of this soft tin-plate is: 51 ± 3.
For achieving the above object, the invention provides the soft tin-plate of a kind of hardness HR30T within 51 ± 3, its substrate composition is (weight percent):
C≤0.005%,
Mn:0.20~0.30%,
Al:0.03~0.06%,
Si≤0.03%,
Ti:0.03~0.06%,
P≤0.012%,
S≤0.015%,
N≤0.003%,
O≤0.004%,
Surplus is Fe and some unavoidable impurities elements.
Wherein, in 51 ± 3 scope, (will be called the T-1.5CA soft tin-plate below the soft tin-plate of this durometer level),, use two kinds of different chemical ingredients productions for different product thicknesses in order to ensure the hardness HR30T of soft tin-plate among the present invention.Chemical ingredients is by weight percentage: (1) produces thin specification tin plate product (during thickness≤0.25mm), the chemical ingredients scope of steel grade is: C (%)≤0.002, Mn (%): 0.20~0.30, P (%)≤0.012, S (%)≤0.015, Al (%): 0.03~0.06, N (%)≤0.003, Si (%)≤0.03, Ti (%): 0.03~0.045, O (%) :≤0.004; When (2) producing thick specification tin plate product (thickness〉0.25mm), the chemical ingredients scope is: C (%): 0.0020~0.0050, Mn (%): 0.20~0.30, P (%)≤0.012, S (%)≤0.015, Al (%): 0.03~0.06, N (%)≤0.003, Si (%)≤0.03, Ti (%): 0.04~0.06, O (%) :≤0.004.
Below be the effect and the qualification explanation thereof of patent principal element of the present invention:
C:≤0.005%,
The C element is one of strengthening element, meet the demands in order to guarantee product performance, and hardness HR30T is stable is controlled at below 54, and C content must be controlled at below 0.005%.If C content surpasses 0.005%, in order to ensure the ageing resistance performance, then must add more Ti, thereby production cost is increased, simultaneously, the hardness of product will rise, and the processability variation is difficult to produce the T-1.5CA soft tin-plate.Because the product of different thickness, when measuring hardness HR30T, the anvil block effect difference of base, the anvil block effect of base is big when measuring the specification product, measuring result is higher, thereby, be less than or equal to the product of 0.25mm for product thickness, C content is controlled at≤0.002%, and for the product of product thickness greater than 0.25mm, C content is controlled between 0.002%~0.005%, regulate the actual hardness of product by C content, thereby offset the influence that base anvil block effect causes, be controlled within 51 ± 3 the hardness HR30T of the finished product is stable.
Mn:0.20~0.30%,
Mn is a main solution strengthening element of the present invention, it has considerable influence to the mechanical property of the finished product, it is high more to contain the Mn amount, hardness is high more, therefore the present invention is controlled at the Mn element below 0.30%, and when the Mn constituent content surpasses 0.30%, production cost will improve on the one hand, product hardness also will rise on the other hand, easily exceed the hardness upper limit of T-1.5CA.But when the Mn element was lower than 0.20%, the hardness of product was lower than the hardness lower limit of T-1.5CA again easily, and therefore, the present invention is controlled at Mn content between 0.20%~0.30%.
Ti:0.03~0.06%,
Ti is the strong carbide forming element, mainly plaing a part fixedly, uncombined carbon makes it form TiC, Ti can significantly improve the ageing resistance performance of soft tin-plate, especially its punching formation property, TiC also has certain dispersion-strengthened action simultaneously, can improve the intensity and the hardness of material, but Ti price more expensive (though than Nb considerably cheaper), contain the Ti amount and increase the increase cost, so should strictly control its content, the present invention is controlled at its content below 0.06%.But when titanium content is low, can't the solid solution atoms such as C in the steel is all fixing, therefore, the present invention is controlled at the Ti constituent content more than 0.03%.But concrete quantity should correspondingly be adjusted Ti content according to the C content in the steel, and for C content≤0.002% o'clock, Ti content is controlled between 0.03~0.045%, and for C content at 0.002~0.005% o'clock, Ti content is controlled at 0.04~0.06%.
Al:0.03~0.06%,
Al is calm element, also is strong nitride forming element, is used for fixing the N atom, and favourable to the ageing resistance performance that improves material, it is influential to solidity to corrosion and mechanical property etc. in addition, and the present invention is strict controlled in Al content between 0.03%~0.06%.When Al content is lower than 0.03%, do not reach the purpose of fix N atom, material ageing resistance performance variation, when Al content is higher than 0.06%, cost up, and will suppress the growth of when annealing recrystal grain, therefore Al content is controlled at below 0.06%.
Si:≤0.03%,
Worsen solidity to corrosion though Si has certain strengthening effect, so low more good more, the present invention requires its content is controlled at below 0.03%, when its content surpasses 0.03%, obviously worsens corrosion resisting property.
Other element: P (P≤0.012%), S (S≤0.015%), N (N≤0.003%), O (O≤0.004%) is the detrimental impurity element, should strictly control, low more good more, otherwise influence the mechanical property and the solidity to corrosion of soft tin-plate, the inclusion content that how much has reflected material of O, because the T-1.5CA soft tin-plate is used for the production of drawing more, therefore want strict its O content of control, thereby control its oxide inclusion, guarantee also not ftracture after the punching press of thin material.
T-1.5CA soft tin-plate of the present invention adopts following operation production: associating → continuous annealing → smooth → zinc-plated is rolled in steel-making → continuous casting → hot rolling → acid, also can adopt steel-making → continuous casting → hot rolling → pickling → cold continuous rolling → continuous annealing → smooth → zinc-plated, or steel-making → continuous casting → hot rolling → pickling → repeatedly reversible is cold rolling → continuous annealing → smooth → tin plating technique production.
Below be the key point of master operation:
Steel-making: molten steel suitable blow off [C] (carbon concentration) and ladle F[O in converter smelting] (free oxygen concn) be the key of assurance RH deoxidation effect.Carry out the RH vacuum outgas and handle in refining, [C] control is crucial, and the adding of Al should be held according to the free oxygen content of molten steel opportunity, avoids producing excessive Al 2O 3In addition, the control of inclusion also is the key of steel making working procedure, so should strict control O content.
Hot rolling: the hot rolling tapping temperature is controlled between 1190 ℃~1250 ℃, and preferred hot rolling tapping temperature is controlled between 1200 ℃~1240 ℃; Hot rolling finishing temperature is controlled between 880~920 ℃.Theoretical and production practice have all proved finishing temperature greater than 920 ℃, and the belt steel surface oxidation is serious, and product surface quality is poor, but when finishing temperature is lower than 880 ℃, will make hot rolled strip mixed grain structure occur, and causes the inequality of the finished product structure property.The T-1.5CA soft tin-plate that the present invention uses continuous annealing to produce, when hot rolling finishing temperature is controlled between 880~920 ℃, make the belt steel surface oxidation lighter, follow-up pickling efficient is improved, product surface quality also improves, and mixed grain structure does not appear yet in the band steel, the finished product structure property is even.Preferred hot rolling finishing temperature scope is controlled between 885~915 ℃.The hot rolling reeling temperature is controlled between 560 ℃~620 ℃.Improve the hardness that coiling temperature can reduce the finished product, improve the forming property of the finished product, but when coiling temperature during greater than 620 ℃, the belt steel surface iron scale is thickened, it is difficult that pickling becomes, and influence product surface quality.When coiling temperature during less than 560 ℃, hot rolling intermediates crystal grain is too small, and has influence on the finished product tissue, makes the crystal grain of final finished tiny, and hardness increases, and plasticity is relatively poor.So use the T-1.5CA soft tin-plate of continuous annealing production for the present invention, when the hot rolling reeling temperature is controlled at 560 ℃~620 ℃, the durometer level of the finished product can be controlled within 51 ± 3, it is less to batch back belt steel surface iron scale amount, pickling is more or less freely, pickling production efficiency height, and the surface quality of the finished product is good.Preferred hot rolling reeling temperature is controlled between 570 ℃~610 ℃.
Pickling and cold rolling: can adopt acid to roll the production of associating unit, perhaps first pickling, after carry out cold continuous rolling or repeatedly reversible cold rolling, but preferably adopt acid to roll the production of associating unit, to enhance productivity.Should adjust unit speed according to the pickling ability of unit during pickling, guarantee pickling effect.Cold rolling when being five frame tandem rollings, cold rolling total draft is 82%~92%.Cold rolling reduction will influence the mechanical property of material, and suitable cold rolling reduction is convenient to roll the assurance of hard material dimensional precision and the control of plate shape.The too little then forming materials of deflection is poor, and it is poor that the too greatly then cold rolling production of deflection consumes increase and rolls hardwood board shape, influences the stable logical plate of high speed that operation is moved back by follow-up company.The present invention uses the cold rolling reduction of the T-1.5CA soft tin-plate of the different size that continuous annealing produces suitably to improve cold rolling reduction on common low carbon aluminium killed steel tin plate rolling procedure, suitably improve the rolling load of each frame in the cold-rolled process, guarantee the stable rolling of IF steel.
Continuous annealing: the T-1.5CA soft tin-plate that the present invention uses continuous annealing to produce, annealing temperature is controlled between 730 ℃~760 ℃, and soaking time is controlled between 25s~50s.Though adopt bell-type annealing also can produce soft tin-plate, the tin-plated product mechanical property of bell-type annealing explained hereafter is inhomogeneous, its product plate shape and surface quality can not show a candle to the soft tin-plate that continuous annealing is produced.The present invention adopts titanium-IF steel continuous annealing to produce the T-1.5CA soft tin-plate, and its product mechanical property is even, and product surface quality is good, can satisfy customer requirements preferably, thereby has the stronger market competitiveness.When annealing temperature was higher than 760 ℃, because soft, the thin thickness of band steel matter, the band steel was easy to take place wooden dipper song even broken belt in annealing furnace, and energy expenditure also will increase simultaneously.Therefore patent of the present invention is controlled at annealing temperature below 760 ℃.When annealing temperature is lower than 730 ℃, can't guarantee also can finish recrystallize under higher unit speed condition, product hardness increases, and processability descends, so this patent is controlled at annealing temperature more than 730 ℃.Preferably, annealing temperature is controlled between 735 ℃~755 ℃.Soaking time and annealing temperature are interactional, improve annealing temperature and be convenient to shorten soaking time, but soaking time can not be less than 25s, otherwise recrystal grain is grown up insufficient, material is hard partially, and plasticity descends, the easy sideslip of band steel when the unit production rate is too fast simultaneously.Soaking time again can not be oversize, and when soaking time surpassed 50s, to move back unit speed too low owing to connect, and production efficiency reduces on the one hand, and crystal grain looks too big on the other hand, and material is soft partially and be with steel to be easy to wooden dipper song even broken belt in annealing furnace.The T-1.5CA soft tin-plate that the present invention uses titanium-IF steel continuous annealing to produce, lower than the annealing temperature of using niobium-IF steel (annealing temperature will just can guaranteed abundant recrystallize more than 750 ℃ usually) continuous annealing production soft tin-plate, therefore when production program layout, can reduce the consumption of transition volume and the time of heating-cooling, enhance productivity, reduce production costs, and because the reduction of temperature has reduced the probability of being with steel that wooden dipper song and broken belt take place significantly in annealing furnace.
Smooth: the annealing back adopts the two-shipper frame smooth, and smooth elongation control is within 1.2%~2.2%.Smooth unit elongation was less than 1.2% o'clock, and the surfaceness of the particularly thick specification product of product surface quality and plate shape are difficult to control, and material is soft partially; And smooth unit elongation is greater than 2.2% o'clock, and hardness will significantly improve, and the processability of material and welding property (weldquality) will worsen, and smooth roller roller consumption also can increase.Preferred smooth elongation control is within 1.4%~2.0%.
Zinc-plated: the T-1.5CA soft tin-plate that the present invention uses continuous annealing to produce, adopt the tin plating technique identical with common tin plate to produce.
The present invention uses titanium-IF steel to produce the T-1.5CA soft tin-plate.Because yield strength is low after titanium-IF steel recrystallization annealing, hardness is low, unit elongation, n value (being work hardening exponent) and r value (being plastic strain ratio) height, and there is not a yield extension (YPEL=0), thereby T-1.5CA soft tin-plate of the present invention, quality is softer, and the ageing resistance performance is good, both can guarantee the excellent formability energy and the ageing resistance performance of the finished product, can also guarantee that its performance is even, plate shape is good.Simultaneously, adopt titanium-IF steel to produce soft tin-plate, insensitive to hot-rolled process parameter, recrystallization temperature is low, and overall mechanical property is good.In addition because Ti-IF steel annealing temperature is lower than Nb-IF steel, connect that to move back production process safer, heat energy consumption is low, and transition material consumption is little, and Ti is than Nb low price, so soft tin-plate production cost of the present invention is low.
Embodiment
It below is the example explanation that the present invention produces T-1.5 soft tin-plate.
Example 1-6: adopt titanium-IF steel production thicker (〉 0.25mm) T-1.5 soft tin-plate.Molten steel is handled through RH refining vacuum outgas, and has adopted the measure of various control inclusion, produces continuously cast bloom through conventional continuous casting process at last, and the chemical ingredients of molten steel is as shown in table 2, also contains other unavoidable impurities element in the steel, and surplus is Fe.
The substrate chemical ingredients actual achievement of table 2 example 1-6, wt%
Numbering Finished product thickness (mm) C Si Mn P S Al N O Ti
1 0.26 0.0050 0.007 0.26 0.010 0.0065 0.045 0.0026 0.0027 0.060
2 0.28 0.0040 0.015 0.28 0.012 0.0055 0.053 0.0030 0.0040 0.045
3 0.32 0.0032 0.012 0.30 0.006 0.0150 0.030 0.0018 0.0030 0.055
4 0.55 0.0020 0.030 0.20 0.008 0.0065 0.060 0.0025 0.0023 0.040
5 0.30 0.0027 0.008 0.27 0.009 0.010 0.035 0.0021 0.0035 0.043
6 0.35 0.0035 0.023 0.23 0.007 0.012 0.055 0.0023 0.0021 0.046
Continuously cast bloom is heated to the hot rolling cogging temperature before hot rolling, batch after roughing, finish rolling and laminar flow cooling, cools off after CDCM unit (pickling and cold continuous rolling associating unit) is produced cold-reduced sheet through 2~3 days room temperatures.Concrete processing parameter sees Table 3:
The main technologic parameters actual achievement of table 3 example 1-6
Numbering Tapping temperature (℃) Hot rolling finishing temperature (℃) The hot rolling reeling temperature (℃) Cold rolling draft (%)
1 1250 920 620 89
2 1220 910 605 88
3 1215 905 587 87
4 1190 880 560 82
5 1200 885 570 89
6 1240 915 610 87
With cold rolled strip anneal at CAPL unit (continuous annealing and levelling machine group), smooth, carry out conventional zinc-plated production tin plate then, parameter and annealing and uncoated tinplate base hardness are as shown in table 4.
The parameter and annealing actual achievement of table 4 example 1-6
Numbering Annealing soaking soaking time (s) Annealing temperature (℃) Smooth elongation (%) Uncoated tinplate base hardness HR30T
1 25 760 2.2 52.7
2 32 755 1.5 51.1
3 38 745 1.2 51.2
4 50 730 1.4 50.3
5 40 750 2.0 51.7
6 27 735 1.8 52.0
Basic identical before and after the mechanical property timeliness of the finished product, mechanical property is as shown in table 5 after its timeliness.
The mechanical property of table 5 example 1-6 and surface quality actual achievement
Numbering Condition stress σ 0.2(MPa) Tensile strength (MPa) Uniform elongation (%) Yield extension rate Y PEL(%) Tension set (%) Tin plate finished product hardness (HR30T) Surface quality
1 255 362 24 0 39 52.7 Excellent
2 259 358 25 0 40 51.1 More excellent
3 252 350 25 0 40 51.3 More excellent
4 246 359 26 0 42 50.3 Excellent
5 253 352 25 0 40 51.7 More excellent
6 251 350 26 0 41 52.0 Excellent
Example 7-12: adopt titanium-IF steel to produce thickness smaller or equal to the thin specification tin plate of 0.25mm.Molten steel is handled through RH refining vacuum outgas, and has adopted the measure of various control inclusion, produces continuously cast bloom through conventional continuous casting process at last, and the chemical ingredients of molten steel is as shown in table 6, also contains other unavoidable impurities element in the steel, and surplus is Fe.
The substrate chemical ingredients actual achievement of table 6 example 7-12, wt%
Numbering Finished product thickness C Si Mn P S Al N O Ti
7 0.23 0.0015 0.025 0.23 0.009 0.0150 0.060 0.0023 0.0040 0.045
8 0.25 0.0020 0.006 0.28 0.012 0.0100 0.030 0.0020 0.0021 0.042
9 0.17 0.0012 0.015 0.30 0.007 0.0060 0.045 0.0030 0.0018 0.035
10 0.20 0.0018 0.008 0.21 0.010 0.0080 0.050 0.0018 0.0027 0.030
11 0.21 0.0017 0.030 0.27 0.009 0.0120 0.040 0.0027 0.029 0.038
12 0.19 0.0019 0.018 0.20 0.011 0.0110 0.055 0.0023 0.035 0.039
Continuously cast bloom is heated to the hot rolling cogging temperature before hot rolling, batch after roughing, finish rolling and laminar flow cooling, cools off after CDCM unit (pickling and cold continuous rolling associating unit) is produced cold-reduced sheet through 2~3 days room temperatures.Concrete processing parameter sees Table 7:
The main technologic parameters actual achievement of table 7 example 7-12
Numbering Tapping temperature (℃) Hot rolling finishing temperature (℃) The hot rolling reeling temperature (℃) Cold rolling draft (%)
7 1245 918 600 89
8 1250 920 620 88
9 1200 885 570 92
10 1225 912 590 90
11 1240 915 610 90
12 1190 880 560 91
With cold rolled strip anneal at CAPL unit (continuous annealing and levelling machine group), smooth, carry out conventional zinc-plated production tin plate then, parameter and annealing is as shown in table 8.
The parameter and annealing actual achievement of table 8 example 7-12
Numbering Annealing temperature (℃) Annealing soaking soaking time (s) Smooth elongation (%) Uncoated tinplate base hardness HR30T
7 735 29 1.9 52.9
8 730 50 2.2 51.7
9 745 27 1.5 50.7
10 760 25 1.4 51.6
11 740 35 2.0 51.3
12 750 26 1.2 51.9
Basic identical before and after the mechanical property timeliness of the finished product, mechanical property is as shown in table 9 after its timeliness.
The mechanical property of table 9 example 7-12 and surface quality actual achievement
Numbering Condition stress σ 0.2(MPa) Tensile strength (MPa) Uniform elongation (%) Yield extension rate Y PEL (%) Tension set (%) Tin plate finished product hardness HR30T Surface quality
7 265 363 25 0 39 52.8 Excellent
8 250 350 24 0 41 51.7 Excellent
9 249 351 24 0 37 50.8 More excellent
10 252 352 25 0 40 51.6 More excellent
11 251 350 24 0 40 51.3 More excellent
12 256 357 24 0 38 51.9 Excellent

Claims (14)

1. the soft tin-plate of a hardness HR30T in 51 ± 3, the composition of its substrate is (weight percent):
C≤0.005%;
Mn:0.20%~0.30%;
Al:0.03%~0.06%;
Si≤0.03%;
Ti:0.038%~0.06%;
P≤0.012%;
S≤0.015%;
N≤0.003%;
O:≤0.004%;
Surplus is Fe and some unavoidable impurities elements.
2. tin plate according to claim 1 is characterized in that, when product thickness≤0.25mm, described C content is≤0.002%; Described Ti content is 0.038%~0.045%.
3. tin plate according to claim 1 is characterized in that, when product thickness〉during 0.25mm, described C content is 0.002%~0.005%; Described Ti content is 0.04%~0.06%.
4. the manufacture method of soft tin-plate according to claim 1 comprises the steps: that steel-making → continuous casting → hot rolling → acid rolls associating → continuous annealing → smooth → zinc-plated.
5. method according to claim 4 is characterized in that, described acid is rolled the step of associating and finished by adopting pickling and cold continuous rolling associating unit.
6. method according to claim 4 is characterized in that, the step that associating is rolled in described acid is to replace by carrying out cold continuous rolling or repeatedly reversible cold rolling step after the first pickling.
7. method according to claim 4 is characterized in that, in described hot-rolled step, the slab tapping temperature is controlled between 1190 ℃~1250 ℃, and finishing temperature is controlled between 880 ℃~920 ℃; Coiling temperature is controlled between 560 ℃~620 ℃.
8. method according to claim 7 is characterized in that, in described hot-rolled step, the slab tapping temperature is controlled between 1200 ℃~1240 ℃, and finishing temperature is controlled between 885 ℃~915 ℃; Coiling temperature is controlled between 570 ℃~610 ℃.
9. according to claim 5 or 6 described methods, it is characterized in that in described cold rolling step, cold rolling reduction is controlled between 82%~92%.
10. method according to claim 4 is characterized in that, in the step of described continuous annealing, annealing temperature is controlled between 730 ℃~760 ℃, and soaking time is controlled between 25s~50s.
11. method according to claim 10 is characterized in that, described annealing temperature is controlled between 735 ℃~755 ℃.
12. method according to claim 4 is characterized in that, described planarization step adopts single chassis or two-shipper frame to finish.
13., it is characterized in that in described planarization step, smooth unit elongation is 1.2%~2.2% according to claim 4 or 12 described methods.
14. method according to claim 13 is characterized in that, described smooth unit elongation is 14%~2.0%.
CNB200510027290XA 2005-06-29 2005-06-29 Soft tin-plate of hardness HR30T 51+/-3 and making process thereof CN100473740C (en)

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RU2008103189/02A RU2382111C2 (en) 2005-06-29 2006-06-26 Soft black sheet iron with hardness hr 30t, which is 51±3, for blanching and method for its manufacturing
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