CN103510002A - Gapless atom cold-rolled hot-galvanized steel plate and production method thereof - Google Patents
Gapless atom cold-rolled hot-galvanized steel plate and production method thereof Download PDFInfo
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Abstract
The invention relates to a gapless atom cold-rolled hot galvanized steel plate and a production method thereof, which belongs to the technical field of iron-base alloys and solves the technical problem that the product performance can not reach the standard when a horizontal continuous annealing furnace is adopted for annealing to produce the gapless atom hot-galvanized steel plate in the prior art. The technical scheme is as follows: the gapless atom cold-rolled hot galvanized steel plate comprises the following chemical components in percentage by weight: 0.0005%-0.0028% of C, at most 0.03% of Si, 0.08%-0.20% of Mn, 0.02%-0.065% of Ti, at most 0.0030% of N, at most 0.015% of P, at most 0.010% of S, and the balance of Fe and inevitable impurity elements. The microscopic structure grain fineness of the cold-rolled steel plate is Grade I6.5-I8.0, the yield strength is 165-200 MPa, the tensile strength is 270-330 MPa, the percentage elongation after fracture A80mm is 38-44%, and the plastic strain ratio r is greater than or equal to 1.9. The method lowers the production cost of the gapless atom cold-rolled hot-galvanized steel plate. The product is mainly used for home appliance products, hardware structures and the like.
Description
Technical field
The present invention relates to a kind of gap-free atom cold rolling hot dip galvanizing steel plate and production method thereof, belong to ferrous alloy technical field.
Background technology
Gapless atomic steel is called again IF steel (abbreviation of Interstitial-Free Steel).Due to its atom very close to each other, therefore there is excellent deep drawability and non-ageing, particularly gap-free atom hot-dip galvanizing sheet steel, after anneal more than recrystallization temperature, there is more excellent stamping performance after cold rolling.The prior art of production pot galvanize IF product made from steel has two kinds, and a kind of is through cleaning, to carry out hot dip after bell-type annealing technique again, and a kind of is directly hot dip after continuous annealing process.Compare with process bell-type annealing technique, after continuous annealing, direct heat is zinc-plated has: produce continuously, production efficiency is high; On band steel length and width, mechanical property is even, the advantage that plate shape is good.Therefore the gap-free atom steel plate galvanized that, continuous annealing hot dip galvanizing process is produced is widely used in household appliances, five metals structure.
The gap-free atom cold rolling hot dip galvanizing steel plate that prior art is produced all adopts vertical continuous annealing furnace, its annealing soaking zone is at 200-500 rice, annealing temperature is at 760-800 ℃, and can guarantee to be with steel is 60-120 second in the soaking zone residence time, makes to be with steel can anneal fully; But this vertical continuous annealing furnace investment is large, and energy consumption is high.
For vertical continuous annealing furnace, Horizontal Continuous Furnace less investment, energy consumption is low.You enterprise also once attempted adopting Horizontal Continuous Furnace to produce gap-free atom cold rolling hot dip galvanizing steel plate, because of only 60 meters of the soaking zone length of Horizontal Continuous Furnace, normarzing annealing temperature is at 700-770 ℃, band steel conventionally in stove the soaking zone residence time be 36-59 second, band steel annealing time is inadequate, if annealing temperature is increased to 760-800 ℃, product performance do not reach punching performance requirement; If continue, improve annealing temperature, after now IF crystalline grain of steel is organized and grown up fast, secondary recrystallization likely occurs, cause tissue abnormalities, the problem that exists performance to worsen.
Summary of the invention
The object of this invention is to provide a kind of gap-free atom cold rolling hot dip galvanizing steel plate and production method thereof, mainly solve the product performance that exist when gap-free atom hot-dip galvanizing sheet steel is produced in the annealing of available technology adopting Horizontal Continuous Furnace and do not reach the technical problem of requirement.
The technical solution used in the present invention is:
A kind of gap-free atom cold rolling hot dip galvanizing steel plate, chemical component weight per-cent is: C:0.0005%～0.0028%, Si :≤0.03%, Mn:0.08%～0.20%, Ti:0.02%～0.065%, N≤0.0030%, P≤0.015%, S≤0.010%, surplus is Fe and inevitable tramp element.Cold-rolled steel sheet microstructure grain size number is I6.5～I8.0 level, and yield strength is 165～200MPa, and tensile strength is 270～330MPa, elongation after fracture A
80mmbe 38%～44%, Lankford r value>=1.9.
The chemical composition of gap-free atom cold rolling hot dip galvanizing steel plate of the present invention is limited to the reasons are as follows in above-mentioned scope:
Carbon: the C content in gap-free atom hot-dip galvanizing sheet steel directly affects product punching performance, especially under the not enough condition of annealing soaking time, affects the performance of low yield strength and high uniform elongation.Therefore, it is 0.0005%～0.0028% that technical solution of the present invention is set C content range, is preferably 0.0010%～0.0020%.
Nitrogen: nitrogen increases unfavorablely to steel plate deep drawability in gap-free atom cold rolling hot dip galvanizing steel plate, therefore requires to reduce N content.Technical solution of the present invention is set N content≤0.0030%.
Titanium: by adding of Ti, further with C, the combination of N atom, generate the carboritride of Ti, thereby eliminate free C, N atom, realize gapless solid solution atom in steel and exist.Titanium content is relevant to the recrystallization temperature of steel plate, and titanium content will need match with annealing temperature, and therefore, it is 0.02%～0.065% that technical solution of the present invention is set Ti content.
Manganese: the Mn in steel of the present invention reduces red brittleness in steel billet processing.It is 0.08%～0.20% that technical solution of the present invention is set Mn content range, is preferably 0.08%～0.015%.
Silicon: the Si in steel of the present invention is impurity element is residual content in steel.The too low cost that can improve steel-making refining procedure of Si content requirement.Technical solution of the present invention is set Si content≤0.03%.
Sulphur: the S in steel of the present invention is impurity element, and too low S content can increase the cost of steel desulfurization.Technical solution of the present invention is set S content≤0.010%.
Phosphorus: the P in steel of the present invention is impurity element, too low P content can increase cost.Technical solution of the present invention is set P content≤0.015%.
A kind of production method of gap-free atom cold rolling hot dip galvanizing steel plate, by following composition quality per-cent, smelt: C:0.0005%～0.0028%, Si :≤0.03%, Mn:0.08-0.20%, Ti:0.02%～0.065%, N≤0.0030%, P≤0.015%, S≤0.010%, surplus is Fe and inevitable tramp element; Adopt successively desulfurizing iron, converter top bottom blowing, the refining of RH stove, be cast into continuous casting steel billet; Continuously cast bloom is heated to 1080～1160 ℃ through process furnace, carries out rolling in hot continuous rolling frame, and roughing rolling temperature is 980～1120 ℃; The finish rolling stage is 7 passage rollings, and finish rolling start rolling temperature is 950～1050 ℃, and finish rolling end temp is 900～940 ℃; Batching and obtaining steel plate thickness is 2.0～4.0mm coils of hot-rolled steel, and coiling temperature is 680～740 ℃; Again uncoiling is after overpickling is removed scale on surface to coils of hot-rolled steel, and on cold continuous rolling or on reciprocating single stand mill, through repeatedly cold rolling, cold rolling draft is 70%～90%; The hard state band steel that rolls after cold rolling is annealed through Horizontal Continuous Furnace, in the annealing temperature of Horizontal Continuous Furnace soaking zone, is 810～850 ℃, and annealing time is 35～59s; Pot galvanize, batch and obtain gap-free atom cold rolling hot dip galvanizing steel plate finished product, it is characterized in that:
1, the carbon content in steel is set
C content in gap-free atom cold rolling hot dip galvanizing steel plate directly affects product punching performance, especially under the not enough condition of annealing soaking time, affects the performance of low yield strength and high uniform elongation.Therefore, consider, it is 0.0005%～0.0028% that technical solution of the present invention is set C content range, is preferably 0.0005%～0.0020%.
2, the titanium content in steel is set
By adding of Ti, further with C, the combination of N atom, generate the carboritride of Ti, thereby eliminate free C, N atom, realize gapless solid solution atom in steel and exist.Titanium content is relevant to the recrystallization temperature of steel plate, and titanium content will need match with annealing temperature, therefore, considers, and it is 0.02%～0.065% that technical solution of the present invention is set Ti content.
3, the manganese content in steel is set
Mn in steel of the present invention reduces red brittleness in steel billet processing.Therefore, consider, it is 0.08%～0.20% that technical solution of the present invention is set Mn content range, is preferably 0.08%～0.015%.
4, slab heating temperature is set
In the heat-processed of gapless atomic steel continuous casting steel billet, to there is the dissolving of Ti (C, N) second phase particles.Heating temperature is at 1080～1160 ℃, is conducive to reduce second phase particles and is dissolved with and is beneficial to the recrystallize of crystal grain after annealing and grows up.Therefore, consider, slab heating temperature of the present invention is set as 1080～1160 ℃.
5, finish rolling end temp is set
Therefore the finish rolling finishing temperature of gap-free atom steel plate galvanized will, consider higher than Ar3 transformation temperature, and finish rolling end temp of the present invention is set as 900～940 ℃, is preferably 910～920 ℃.
6, coiling temperature is set
The tissue of hot rolling finish to gauge coiling temperature major effect material, performance and cold rolling after company move back recrystallization temperature.Along with the rising of coiling temperature, can make the abundant alligatoring of precipitate, crystal grain is fully grown up.Therefore, consider, coiling temperature of the present invention is set as 680～740 ℃, is preferably 700～740 ℃.
7, cold rolling draft is set
Gap-free atom cold rolling hot dip galvanizing steel plate r value increases and monotone increasing with cold rolling draft, and along with the raising of cold rolling draft, the deformation energy of storing in steel plate increases, and increases recrystallize motivating force, is conducive to the carrying out of annealing process.Therefore, consider, the cold rolling draft of the present invention is 70%～90%, is preferably 80%～90%.
8, annealing temperature and annealing time are set
Recovery and recrystallization and three processes of grain growth that hard steel band experiences in annealing process of rolling after cold rolling all have influence on end properties.The setting of annealing temperature is generally two factors of recrystallization temperature, product performance demands scope that consider with steel, for the cold rolling supplied materials of high draft.Therefore, consider, it is 810～850 ℃ in the annealing temperature of the soaking zone of Horizontal Continuous Furnace that the present invention sets steel band, with steel, at the annealing time of soaking zone, is 35～59s.
Adopting the microstructure grain size number of the gap-free atom cold rolling hot dip galvanizing steel plate of aforesaid method production is I6.5～I8.0 level, yield strength is 165～200MPa, tensile strength is 270～330MPa, and elongation after fracture A80mm is 38%～44%, Lankford r value >=1.9.
The present invention has following positively effect compared to existing technology:
The present invention by the design of C content, hot rolling finish to gauge, batch, high draft is cold rolling, horizontal chamber oven connects annealing technology optimum combination, realized and adopted the qualified gap-free atom cold rolling hot dip galvanizing steel plate of horizontal chamber oven annealing production performance, reduced gap-free atom cold rolling hot dip galvanizing Plate Production cost.
2. to adopt annealing temperature be 810～850 ℃ of C in the present invention, annealing time is the high-temperature annealing process of 35～59s, make steel band obtain abundant recrystallized structure, cold-rolled steel sheet microstructure grain size number is I6.5～I8.0 level, yield strength is 165～200MPa, tensile strength is 270～330MPa, elongation after fracture A
80mmbe 38%～44%, Lankford r value>=1.9.
Accompanying drawing explanation
Accompanying drawing 1 is the metallographic structure photo of the interstitial-free hot-rolled steel plate of the embodiment of the present invention 2.
Accompanying drawing 2 is the metallographic structure photo of the gap-free atom cold rolling hot dip galvanizing steel plate of the embodiment of the present invention 2.
Embodiment
Below in conjunction with embodiment 1-4, the invention will be further described, as shown in table 1～table 4.
Table 1 the present invention (weight percent %), surplus is Fe and inevitable impurity.
| Element | C | Si | Mn | Ti | N | P | S |
| The present invention | 0.0005-0.0028 | ≤0.03 | 0.08-020 | 0.02-0.065 | ≤0.0030 | ≤0.015 | ≤0.010 |
| Embodiment 1 | 0.0007 | 0.011 | 0.19 | 0.024 | 0.0030 | 0.011 | 0.010 |
| Embodiment 2 | 0.0025 | 0.007 | 0.14 | 0.047 | 0.0021 | 0.012 | 0.009 |
| Embodiment 3 | 0.0012 | 0.005 | 0.09 | 0.060 | 0.0016 | 0.008 | 0.008 |
| Embodiment 4 | 0.0014 | 0.006 | 0.15 | 0.048 | 0.0019 | 0.012 | 0.008 |
By converter melting, RH stove vacuum decarburization, the continuously cast bloom of the chemical composition that obtains meeting the requirements, thickness is 210～240mm, and width is 800～1300mm, and length is 5000～10000mm.Scale slab is delivered to process furnace and is reheated, and delivers to rolling on hot tandem rolling mill after the dephosphorization of coming out of the stove, and roughing rolling temperature is 950～1120 ℃, the finish rolling stage is 7 passage finish rolling, control coolingly, then batch, obtaining steel plate thickness is 2.0～4.0mm coils of hot-rolled steel.Technology controlling and process is in Table 2.
Table 2 hot rolling technology of the present invention is controlled parameter
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, on reversible rolling or 5 Stands Cold Tandem Mills, carry out cold rolling, cold rolling draft is 70%～90%, the steel band that rolls hard state after cold rolling is annealed through Horizontal Continuous Furnace, annealing process is: steel band is 810～850 ℃ in the annealing temperature of the soaking zone of Horizontal Continuous Furnace, is: 35～59s, pot galvanize at the annealing time of soaking zone, batch, obtaining thickness is the gap-free atom cold rolling hot dip galvanizing steel plate of 0.3～1.2mm.Process control parameter is in Table 3.
Table 3 the present invention is cold rolling, annealing process is controlled parameter
Utilize the mechanical property of the gap-free atom cold rolling hot dip galvanizing steel plate that aforesaid method obtains and grain fineness number in Table 4.
Mechanical property and the grain fineness number of table 4 gap-free atom cold rolling hot dip galvanizing of the present invention steel plate
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 requirement of the present invention.
Claims (8)
1. a gap-free atom cold rolling hot dip galvanizing steel plate, its chemical composition mass percent: 0.0005%～0.0028%, Si :≤0.03%, Mn:0.08%～0.20%, Ti:0.02%～0.065%, N≤0.0030%, P≤0.015%, S≤0.010%, surplus is Fe and inevitable tramp element.
2. a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 1, is characterized in that, in steel, carbon mass percent is 0.0005%～0.0020%.
3. a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 1, is characterized in that, in steel, manganese element mass percent is 0.08%～0.015%.
4. a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 1, is characterized in that, described cold-rolled steel sheet microstructure grain size number is I6.5～I8.0 level.
5. a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 1, is characterized in that, the yield strength of described cold-rolled steel sheet is 165～200MPa, and tensile strength is 270～330MPa, elongation after fracture A
80mmbe 38%～44%, Lankford r value>=1.9.
6. the production method of a gap-free atom cold rolling hot dip galvanizing steel plate, by following composition quality per-cent, smelt: C:0.0005%～0.0028%, Si :≤0.03%, Mn:0.08-0.20%, Ti:0.02%～0.065%, N≤0.0030%, P≤0.015%, S≤0.010%, surplus is Fe and inevitable tramp element; Adopt successively desulfurizing iron, converter top bottom blowing, the refining of RH stove, be cast into continuous casting steel billet; Bar plate heating stove heating, roughing, finish rolling, batch that to obtain steel plate thickness be 2.0～4.0mm coils of hot-rolled steel; Then by coils of hot-rolled steel again uncoiling, through pickling, cold rolling, horizontal chamber oven continuous annealing, pot galvanize, batch and obtain the gap-free atom cold rolling hot dip galvanizing steel plate finished product that steel plate thickness is 0.3～1.2mm, it is characterized in that, continuously cast bloom is heated to 1080～1160 ℃ through process furnace, in hot continuous rolling frame, carry out rolling, roughing rolling temperature is 980～1120 ℃; The finish rolling stage is 7 passage rollings, and finish rolling start rolling temperature is 950～1050 ℃, and finish rolling end temp is 900～940 ℃; After finish rolling, coiling temperature is 680～740 ℃; On cold continuous rolling, be rolled, cold rolling draft is 70%～90%; The hard state band steel that rolls after cold rolling is annealed through Horizontal Continuous Furnace, in the annealing temperature of the soaking zone of Horizontal Continuous Furnace, is 810～850 ℃, and annealing time is 35～59s.
7. the production method of a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 6, is characterized in that, described finish rolling end temp is 910～920 ℃.
8. the production method of a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 6, is characterized in that, described coiling temperature is 700～740 ℃.
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