CN100518977C - Manufacturing method for producing cold-rolled hard steel plate by continuous annealing process - Google Patents
Manufacturing method for producing cold-rolled hard steel plate by continuous annealing process Download PDFInfo
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- CN100518977C CN100518977C CNB2007102024157A CN200710202415A CN100518977C CN 100518977 C CN100518977 C CN 100518977C CN B2007102024157 A CNB2007102024157 A CN B2007102024157A CN 200710202415 A CN200710202415 A CN 200710202415A CN 100518977 C CN100518977 C CN 100518977C
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- 238000000137 annealing Methods 0.000 title claims abstract description 65
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 63
- 239000010959 steel Substances 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000005097 cold rolling Methods 0.000 claims abstract description 36
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 17
- 238000005098 hot rolling Methods 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 23
- 239000000203 mixture Substances 0.000 description 23
- 238000005516 engineering process Methods 0.000 description 13
- 238000001953 recrystallisation Methods 0.000 description 11
- 239000010955 niobium Substances 0.000 description 6
- 241001062472 Stokellia anisodon Species 0.000 description 5
- 238000009749 continuous casting Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 230000008520 organization Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000018984 mastication Effects 0.000 description 2
- 238000010077 mastication Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000003359 percent control normalization Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000655 Killed steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
The invention discloses a manufacturing method for producing a cold-rolled hard steel plate by adopting a continuous annealing process for adjusting the hardness of the cold-rolled plate by process means by adopting the same chemical components, which comprises the following process steps: heating a steel billet consisting of a certain component at 1200-1250 ℃; hot rolling the heated steel billet at a temperature of above 850 ℃ to form a steel strip; coiling the hot rolled steel strip within the temperature range of 550-780 ℃; cold rolling the coiled steel strip within the range of 45-75% of reduction rate; annealing the cold-rolled steel strip at the temperature of 630-850 ℃ for 30-60 s; then cooling and conventional overaging, and flattening to obtain a finished product. Because the 1/2 hard plates, 1/4 hard plates and 1/8 hard plates are all adjusted in hardness on a completely recrystallized structure, the production difficulty is reduced, and the stability of performance is greatly improved, so that the series of cold-rolled hard steel plates are produced by adopting the same chemical components on the machine set.
Description
Technical field
The present invention relates to the manufacture method of the cold-rolled steel sheet of industries uses such as bicycle, steel furniture, five metals and stationery, particularly relate to a kind of manufacture method of cold rolled hard steel plate produced by continuous annealing process.
Background technology
Serial cold rolling hard steel plates such as fully hard, 1/2 hard, 1/4 hard and 1/8 hard are widely used in industries such as bicycle, steel furniture, five metals and stationery.Its manufacturing at present can be by batch annealing and two kinds of processing routes of continuous annealing, the former aborning, owing to be tight volume annealing, annealing cycle is longer, the lack of homogeneity of coil of strip different parts annealing temperature and temperature retention time, and the uniformity of steel plate hardness is affected, generally can not control the hardness of steel plate by regulating annealing process, therefore, under this process conditions, by adopting annealing back skin-pass or realizing control to cold-rolled steel sheet hardness by the method for adjusting chemical composition.The processing step that continuous annealing process is produced cold rolling hard steel plate comprises the steel billet heating, hot rolling, batch, cold rolling, annealing, cooling, conventional overaging and technology such as smooth, the continuous annealing temperature retention time is short in this technology, the belt steel temperature uniformity is better, help obtaining hardness uniformly, therefore, under the continuous annealing process condition, can control steel plate hardness by regulating annealing temperature, its production technology features is: fully hard steel plate is produced in (target temperature is 540 ℃) annealing in the recovery temperature district, producing 1/4 hard steel plate near perfect recrystallization humidity province (target temperature is 590 ℃) annealing, 1/8 hard steel plate is produced in (target temperature is 610 ℃) annealing in the perfect recrystallization humidity province, because the annealing temperature interval of each kind is narrower, control to annealing process has strict requirement, in addition because the hardness annealing temperature corresponding interval of 1/2 hard steel plate is the part recrystallization zone, temperature fluctuation is very big to the influence of hardness, stable product quality can't be obtained, therefore 1/2 hard plate can not be produced.On the other hand, be the continuous annealing unit of direct flame heat for heating furnace, adopt this production technology, because annealing temperature is lower, the surface of oxidation can not be reduced fully, has the oxidation tint defective, can not get good glossy surface.It is many that cold rolling hard steel plate generally has specification, the characteristics that contracted quantity is few, produce the cold-reduced sheet of different hardness if adopt different chemical compositions, for TECHNIQUE TO LARGE INTEGRATED STEEL WORKS, being difficult to organization arrangement produces, press for exploitation and adopt identical chemical composition, regulate the production technology of cold-reduced sheet hardness by process means.
Summary of the invention
The technical problem to be solved in the present invention provides the identical chemical composition of a kind of employing, the manufacture method of regulating the cold rolled hard steel plate produced by continuous annealing process of cold-reduced sheet hardness by process means.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of manufacture method of cold rolled hard steel plate produced by continuous annealing process, processing step comprises steel billet heating, hot rolling, batches, cold rolling, annealing, cooling, conventional overaging and smooth, it is characterized in that:
Steel billet by percentage by weight is: C:0.04～0.08%, and Si :≤0.30%, Mn:0.15～0.40%, P :≤0.025%, S :≤0.025%, N :≤0.005%, Nb:0.015～0.035%, Al: 〉=0.015%, surplus is that Fe and inevitable impurity are formed;
In its processing step, billet heating temperature is 1200～1250 ℃, and hot-rolled temperature is more than 850 ℃, and coiling temperature is 550～780 ℃, and cold rolling reduction ratio is 45%～75%, and the temperature of annealing is 630～850 ℃, annealing time 30～60s.
In order to obtain fully hard cold-rolled steel sheet, the coiling temperature that it adopted is 550～600 ℃, and cold rolling reduction ratio is 45～75%, and annealing temperature is 630～660 ℃.
In order to obtain 1/2 hard cold-rolled steel sheet, the coiling temperature that it adopted is 550～600 ℃, and cold rolling reduction ratio is 55～75%, and annealing temperature is 760～790 ℃.
In order to obtain 1/4 hard cold-rolled steel sheet, the coiling temperature that it adopted is 550～600 ℃, and cold rolling reduction ratio is 45～75%, and annealing temperature is 820～850 ℃.
As another kind of embodiment, in order to obtain 1/4 hard cold-rolled steel sheet, the coiling temperature that it adopted is 700～750 ℃, and cold rolling reduction ratio is 45～75%, and annealing temperature is 720～780 ℃.
In order to obtain 1/8 hard cold-rolled steel sheet, the coiling temperature that it adopted is 700～750 ℃, and cold rolling reduction ratio is 45～75%, and annealing temperature is 800～850 ℃.
The invention has the beneficial effects as follows: through suitable composition design, by regulating the production that hot rolling reeling temperature and cold rolled annealed temperature have realized the serial cold rolling hard steel plate of same chemical composition different hardness requirement, because 1/2 hard plate, 1/4 hard plate and 1/8 hard plate all are to carry out the adjusting of hardness at the perfect recrystallization tissue, reduced the production difficulty, improve the stability of performance greatly, thereby realized on such unit, adopting same chemical composition to produce serial cold rolling hard steel plate.Its organization of production difficulty is little, is fit to the production requirement of small lot, many kinds.
The specific embodiment
The present invention selects the reason of chemical composition and scope thereof as follows: the operability and the economy of process for making mainly considered in the selection of carbon content scope, if carbon content is lower than 0.04%, must carry out application of vacuum during steel-making, increase production cost, if carbon content surpasses 0.08%, sometimes need carburetting, also increase the production cost of steel-making.Silicon and nitrogen exist as relict element, specially do not add.Mn adopts the customary amount of carbon aluminium-killed steel, so that organization of production, it mainly acts on is to be combined into MnS with sulphur, prevents the fire check that causes because of FeS.P and S exist as relict element, consider the economy of steel making working procedure, by≤0.025% control.Aluminium mainly adds as deoxidant element, realize complete deoxidation, and its content requirement is more than 0.015%.Niobium plays the effect that hinders annealing recrystallization, refined crystalline strengthening and precipitation strength in steel, its content is lower than 0.015%, the effect that hinders crystallization again is strong inadequately, on the continuous annealing unit of heating furnace, can not produce the fully hard steel plate of glossy surface for straight fire heating, its content surpasses at 0.035% o'clock, and its effect that hinders crystallization again is strong excessively, the annealing temperature control range of dwindling 1/2 hard steel plate, increase its production difficulty, especially when cold rolling rate is low.
The present invention selects the reason of processing range as follows: adopting conventional hot rolling technology (the above finish to gauge of Ar3), is in order to guarantee technology stability and operability.When adopting 550～600 ℃ low temperature to batch, the hardness of steel plate and the relation of annealing temperature present three hardness such as replying district, perfect recrystallization low-temperature space and softened zone (precipitated phase of niobium is grown up, grain coarsening) than stabilised platform, and hardness corresponds respectively to fully hard steel plate (about HRB100), 1/2 hard steel plate (about HRB80) and 1/4 hard steel plate (about HRB72); When adopting 700～750 ℃ high temperature to batch, because of hot rolling attitude niobium is fully separated out and its precipitated phase alligatoring, the effect that niobium hinders annealing recrystallization weakens, its refined crystalline strengthening and precipitation strength effect obviously reduce, the perfect recrystallization low-temperature space moves to low temperature during annealing, and hardness that should the interval is corresponding to 1/4 hard steel plate (about HRB70), and the hardness of softened zone obviously descends, corresponding to 1/8 hard steel plate (about HRB60).Adopt conventional cold rolling reduction ratio (45～75%), for 1/2 hard steel plate, when cold rolling reduction ratio was 45%, its annealing temperature control range was narrower, was unfavorable for the stability of hardness, and therefore, cold rolling reduction ratio is by 55～75% controls.The selection of annealing temperature guarantees can realize in the scope temperature range of corresponding hardness control under chemical composition of the present invention, coiling temperature and cold rolling.
Embodiment
The cold rolling hard steel plate that continuous annealing process is produced, the percentage by weight of its constituent is: C:0.04～0.08%, Si :≤0.30%, Mn:0.15～0.40%, P :≤0.025%, S :≤0.025%, N :≤0.005%, Nb:0.015～0.035%, Al: 〉=0.015%, surplus is that Fe and inevitable impurity are formed.
The manufacture method of fully hard cold-rolled steel sheet is: smelt and continuous casting by above-mentioned chemical composition, by the above temperature hot rolling of Ar3,550～600 ℃ are batched, 45～75% reduction ratios are cold rolling, 630～660 ℃ of annealing 30～60s, cooling and conventional overaging then, after smooth, obtain finished product;
The manufacture method of 1/2 hard cold-rolled steel sheet is: smelt and continuous casting by above-mentioned chemical composition, by the above temperature hot rolling of Ar3,550～600 ℃ are batched, 55～75% is cold rolling, 760～790 ℃ of annealing 30～60s, cooling and conventional overaging then, after smooth, obtain finished product;
The manufacture method of 1/4 hard cold-rolled steel sheet is: smelt and continuous casting by above-mentioned chemical composition, by the above temperature hot rolling of Ar3,550～600 ℃ are batched, 45～75% is cold rolling, 820～850 ℃ of annealing 30～60s, cooling and conventional overaging then, after smooth, obtain finished product; Or smelt and continuous casting by above-mentioned chemical composition, by the above temperature hot rolling of Ar3,700～750 ℃ are batched, and 45～75% is cold rolling, 720～780 ℃ of annealing 30～60s, cooling and conventional overaging then, after smooth, the acquisition finished product;
The manufacture method of 1/8 hard cold-rolled steel sheet is: smelt and continuous casting by above-mentioned chemical composition, by the above temperature hot rolling of Ar3,700～750 ℃ are batched, 45～75% is cold rolling, 800～850 ℃ of annealing 30～60s, cooling and conventional overaging then, after smooth, obtain finished product.
The chemical composition of table 1 expression test steel, the hardness situation that the test steel obtains after smelting, hot rolling, cold rolling, annealing see Table 2 and table 3 shown in.Wherein A1-A2 is the chemical composition of the present invention's employing, and B1-B3 is the chemical composition of contrast steel.
The chemical composition of table 1 the present invention and compared steel (percentage by weight), %
Table 2 the present invention tests the mechanical property of steel
| Grade of steel | Finishing temperature/ | Coiling temperature/ | Cold rolling reduction ratio/% | Annealing temperature/ | Hardness/HRB |
| A1 | 880 | 550 | 45 | 630 | 100 |
| A1 | 880 | 550 | 75 | 660 | 100 |
| A1 | 880 | 600 | 45 | 630 | 100 |
| A1 | 880 | 600 | 75 | 660 | 99 |
| A1 | 880 | 550 | 55 | 760 | 77 |
| A1 | 880 | 550 | 75 | 790 | 78 |
| A1 | 880 | 600 | 55 | 760 | 75 |
| A1 | 880 | 600 | 75 | 790 | 75 |
| A1 | 880 | 550 | 45 | 820 | 70 |
| A1 | 880 | 550 | 75 | 850 | 71 |
| A1 | 880 | 600 | 45 | 820 | 70 |
| A1 | 880 | 600 | 75 | 850 | 69 |
| A1 | 880 | 720 | 45 | 720 | 71 |
| A1 | 880 | 720 | 75 | 780 | 72 |
| A1 | 880 | 720 | 45 | 800 | 60 |
| A1 | 880 | 720 | 75 | 850 | 61 |
| A2 | 910 | 600 | 45 | 630 | 101 |
| A2 | 910 | 600 | 75 | 660 | 102 |
| A2 | 910 | 600 | 55 | 760 | 83 |
| A2 | 910 | 600 | 75 | 790 | 80 |
| A2 | 910 | 600 | 45 | 820 | 74 |
| A2 | 910 | 600 | 75 | 850 | 74 |
| A2 | 910 | 730 | 45 | 720 | 73 |
| A2 | 910 | 730 | 75 | 780 | 72 |
| A2 | 910 | 730 | 45 | 800 | 63 |
| A2 | 910 | 730 | 75 | 850 | 62 |
The mechanical property of table 3 contrast test steel
| Grade of steel | Finishing temperature/ | Coiling temperature/℃ | Cold rolling reduction ratio/% | Annealing temperature/ | Hardness/HRB |
| B1 | 860 | 630 | 85 | 540 | 98 |
| B1 | 860 | 630 | 85 | 560 | 97 |
| B1 | 860 | 630 | 85 | 580 | 93 |
| B1 | 860 | 630 | 85 | 590 | 90 |
| B1 | 860 | 630 | 85 | 610 | 82 |
| B1 | 860 | 630 | 85 | 630 | 73 |
| B2 | 880 | 550 | 85 | 540 | 98 |
| B2 | 880 | 550 | 85 | 560 | 90 |
| B2 | 880 | 550 | 85 | 580 | 85 |
| B2 | 880 | 550 | 85 | 590 | 77 |
| B2 | 880 | 550 | 85 | 610 | 64 |
| B2 | 880 | 550 | 85 | 630 | 63 |
As can be seen from Table 2, the fully hard steel plate annealing temperature range of invention is apparently higher than compared steel, both when heating furnace is the continuous annealing unit production of direct flame heat, guaranteed to obtain the cold-rolled steel sheet of non-oxidation look, and finished product hardness is insensitive to chemical composition, hot rolling technology and cold rolling reduction ratio; The annealing region of 1/2 hard steel plate of invention is at the perfect recrystallization low-temperature space, chemical composition, hot rolling technology and cold rolling reduction ratio are very little to the influence of finished product hardness, and compared steel will be produced 1/2 hard plate, must anneal in the part recrystallization zone, hardness is very responsive to annealing temperature, can not obtain the product of stable performance; 1/4 hard steel plate of invention can batch by low temperature, batch to anneal in hot mastication district annealing or by high temperature and produce at the perfect recrystallization low-temperature space, and compared steel will be produced chemical composition and hot rolling technology that 1/4 hard plate must adopt the B1 steel, and stronger to the dependence of chemical composition and technology; 1/8 hard steel plate of invention batches, anneals in the hot mastication district and produce by high temperature, and compared steel will be produced 1/8 hard steel plate, must adopt the composition of B2, anneals in 610～630 ℃ of temperature ranges.
Claims (1)
1, a kind of manufacture method of cold rolled hard steel plate produced by continuous annealing process, processing step comprise steel billet heating, hot rolling, batch, cold rolling, annealing, cooling, conventional overaging and smooth, it is characterized in that:
Steel billet by percentage by weight is: C:0.04～0.08%, and Si :≤0.30%, Mn:0.15～0.40%, P :≤0.025%, S :≤0.025%, N :≤0.005%, Nb:0.015～0.035%, Al: 〉=0.015%, surplus is that Fe and inevitable impurity are formed;
In its processing step, billet heating temperature is 1200～1250 ℃, and hot-rolled temperature is more than 850 ℃, annealing time 30～60s is 550～600 ℃ at coiling temperature respectively, and cold rolling reduction ratio is 45～75%, when annealing temperature is 630～660 ℃, obtain fully hard cold-rolled steel sheet;
At coiling temperature is 550～600 ℃, and cold rolling reduction ratio is 55～75%, when annealing temperature is 760～790 ℃, obtains 1/2 hard cold-rolled steel sheet;
At coiling temperature is 550～600 ℃, and cold rolling reduction ratio is 45～75%, when annealing temperature is 820～850 ℃, or it is 700～750 ℃ at coiling temperature, cold rolling reduction ratio is 45～75%, when annealing temperature is 720～780 ℃, obtains 1/4 hard cold-rolled steel sheet;
At coiling temperature is 700～750 ℃, and cold rolling reduction ratio is 45～75%, when annealing temperature is 800～850 ℃, obtains 1/8 hard cold-rolled steel sheet.
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