CN103510002B - A kind of gap-free atom cold rolling hot dip galvanizing steel plate and production method thereof - Google Patents
A kind of gap-free atom cold rolling hot dip galvanizing steel plate and production method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of gap-free atom cold rolling hot dip galvanizing steel plate and production method thereof, belong to technical field of iron-base alloy.The technical problem that the product performance existed when adopting Horizontal Continuous Furnace annealing to produce gap-free atom hot-dip galvanizing sheet steel in solution prior art are not up to standard.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.O 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.Present invention reduces gap-free atom cold rolling hot dip galvanizing Plate Production cost.Product of the present invention is mainly used in household appliances, five metals structure etc.
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 technical field of iron-base alloy.
Background technology
Gapless atomic steel is also called IF steel (abbreviation of Interstitial-FreeSteel).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 cold rolling after anneal more than recrystallization temperature, there is more excellent stamping formabilily.The prior art of production pot galvanize IF product made from steel has two kinds, carries out hot dip again after one is through bell-type annealing technique through cleaning, and one is direct hot dip after being through continuous annealing process.With compared with bell-type annealing technique, after continuous annealing, direct pot galvanize has: continuous seepage, and production efficiency is high; On strip 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 soak section is at 200-500 rice, annealing temperature, at 760-800 DEG C, can ensure that band steel is 60-120 second in the soaking zone residence time, makes band 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.Some enterprises also once attempted adopting Horizontal Continuous Furnace to produce gap-free atom cold rolling hot dip galvanizing steel plate, because of the soaking zone length only 60 meters of Horizontal Continuous Furnace, normarzing annealing temperature is at 700-770 DEG C, band steel usually 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 DEG C, then product performance do not reach punching performance requirement; Improve annealing temperature if continue, after now IF crystalline grain of steel organizes fast growth, likely secondary recrystallization occurs, cause tissue abnormalities, there is the problem of penalty.
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 in prior art the technical problem that the product performance existed when adopting Horizontal Continuous Furnace annealing to produce gap-free atom hot-dip galvanizing sheet steel do not reach 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 reason that the chemical composition of gap-free atom cold rolling hot dip galvanizing steel plate of the present invention is limited in above-mentioned scope is as follows:
Carbon: the C content in gap-free atom hot-dip galvanizing sheet steel directly affects product punching performance, especially under annealing soak deficiency of time condition, affects the performance of low yield strength and high uniform elongation.Therefore, technical solution of the present invention setting C content scope is 0.0005% ~ 0.0028%, is preferably 0.0010% ~ 0.0020%.
Nitrogen: nitrogen increase is unfavorable 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 setting N content≤0.0030%.
Titanium: adding by Ti, combines with C, atom N further, generates the carboritride of Ti, thus eliminate free C, atom N, realizes gapless solid solution atom in steel and exists.Titanium content is relevant to the recrystallization temperature of steel plate, and titanium content need will match with annealing temperature, and therefore, technical solution of the present invention setting Ti content is 0.02% ~ 0.065%.
Manganese: the Mn in steel of the present invention mainly reduces red brittleness in steel billet processing.Technical solution of the present invention setting Mn content range is 0.08% ~ 0.20%, is preferably 0.08% ~ 0.015%.
Silicon: the Si in steel of the present invention is impurity element is residual content in steel.Si content requirement is too low, can improve the cost of steel-making refining procedure.Technical solution of the present invention setting Si content≤0.03%.
Sulphur: the S in steel of the present invention is impurity element, too low S content can increase the cost of steel desulfurization.Technical solution of the present invention setting 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 setting P content≤0.015%.
A kind of production method of gap-free atom cold rolling hot dip galvanizing steel plate, smelt by following Ingredient percent: 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 desulfurizing iron, converter top bottom blowing, the refining of RH stove successively, be cast into continuous casting steel billet; Continuously cast bloom is heated to 1080 ~ 1160 DEG C through process furnace, and hot continuous rolling frame carries out rolling, and roughing rolling temperature is 980 ~ 1120 DEG C; The finish rolling stage is 7 passes, and finish rolling start rolling temperature is 950 ~ 1050 DEG C, and finish rolling end temp is 900 ~ 940 DEG C; Batching and obtaining steel plate thickness is 2.0 ~ 4.0mm coils of hot-rolled steel, and coiling temperature is 680 ~ 740 DEG C; Coils of hot-rolled steel again uncoiling removes after scale on surface through overpickling, and through repeatedly cold rolling on cold continuous rolling or on reciprocating single stand mill, cold rolling draft is 70% ~ 90%; The hard state band steel that rolls after cold rolling is annealed through Horizontal Continuous Furnace, and be 810 ~ 850 DEG C in the annealing temperature of Horizontal Continuous Furnace soaking zone, 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 setting in steel
C content in gap-free atom cold rolling hot dip galvanizing steel plate directly affects product punching performance, especially under annealing soak deficiency of time condition, affects the performance of low yield strength and high uniform elongation.Therefore, consider, technical solution of the present invention setting C content scope is 0.0005% ~ 0.0028%, is preferably 0.0005% ~ 0.0020%.
2, the titanium content setting in steel
Adding by Ti, combine with C, atom N further, generate the carboritride of Ti, thus eliminate free C, atom N, realize gapless solid solution atom in steel and exist.Titanium content is relevant to the recrystallization temperature of steel plate, and titanium content need will match with annealing temperature, therefore, considers, and technical solution of the present invention setting Ti content is 0.02% ~ 0.065%.
3, the Fe content setting in steel
Mn in steel of the present invention mainly reduces red brittleness in steel billet processing.Therefore, consider, technical solution of the present invention setting Mn content range is 0.08% ~ 0.20%, is preferably 0.08% ~ 0.015%.
4, slab heating temperature setting
To Ti(C, N be there is in the heat-processed of gapless atomic steel continuous casting steel billet) dissolving of second phase particles.Heating temperature, at 1080 ~ 1160 DEG C, is conducive to reducing second phase particles and is dissolved with the recrystallize being beneficial to the rear crystal grain of annealing and grows up.Therefore, consider, slab heating temperature of the present invention is set as 1080 ~ 1160 DEG C.
5, finish rolling end temp setting
The finish rolling finishing temperature of gap-free atom steel plate galvanized is higher than Ar
3transformation temperature, therefore, considers, and finish rolling end temp of the present invention is set as 900 ~ 940 DEG C, is preferably 910 ~ 920 DEG C.
6, coiling temperature setting
Hot rolling finish to gauge coiling temperature major effect materials microstructure, 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 DEG C, is preferably 700 ~ 740 DEG C.
7, cold rolling draft setting
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 stored 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 setting
After cold rolling roll recovery and recrystallization that hard steel band experiences in annealing process and grain growth three processes all have influence on end properties.The setting of annealing temperature is generally recrystallization temperature, product performance demands scope two factors of considering band steel, for the cold rolling supplied materials of high draft.Therefore, consider, it is 810 ~ 850 DEG C that the present invention sets steel band in the annealing temperature of the soaking zone of Horizontal Continuous Furnace, and band steel is 35 ~ 59s at the annealing time of soaking zone.
The microstructure grain size number of the gap-free atom cold rolling hot dip galvanizing steel plate adopting aforesaid method to produce 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 present invention has following positively effect compared to existing technology:
1. the present invention by C content design, hot rolling finish to gauge, batch, high draft is cold rolling, horizontal chamber oven connects annealing technology optimum combination, achieve the gap-free atom cold rolling hot dip galvanizing steel plate adopting horizontal chamber oven annealing production performance qualified, reduce gap-free atom cold rolling hot dip galvanizing Plate Production cost.
2. the present invention adopts annealing temperature to be 810 ~ 850 DEG C, annealing time is the high-temperature annealing process of 35 ~ 59s, steel band is made to 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;
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 dephosphorization of coming out of the stove, and roughing rolling temperature is 950 ~ 1120 DEG C, the finish rolling stage is 7 passage finish rolling, carry out controlled cooling model, 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 controling parameters of the present invention
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, reversible rolling or 5 Stands Cold Tandem Mills carry out cold rolling, cold rolling draft is 70% ~ 90%, the steel band rolling hard state after cold rolling is annealed through Horizontal Continuous Furnace, annealing process is: steel band is 810 ~ 850 DEG C 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, obtain the gap-free atom cold rolling hot dip galvanizing steel plate that thickness is 0.3 ~ 1.2mm.Process control parameter is in table 3.
Table 3 the present invention is cold rolling, annealing process controling parameters
The mechanical property of the gap-free atom cold rolling hot dip galvanizing steel plate utilizing aforesaid method to obtain and grain fineness number are in table 4.
The mechanical property of table 4 gap-free atom cold rolling hot dip galvanizing of the present invention steel plate and grain fineness number
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. a gap-free atom cold rolling hot dip galvanizing steel plate, its chemical composition mass percent: 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.
2. a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 1, it 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, it is characterized in that, in steel, manganese element mass percent is 0.08% ~ 0.15%.
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, smelt by following Ingredient percent: 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 desulfurizing iron, converter top bottom blowing, the refining of RH stove successively, be cast into continuous casting steel billet; Bar plate heating stove heating, roughing, finish rolling, batch 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, continuous casting steel billet is heated to 1080 ~ 1160 DEG C through process furnace, hot continuous rolling frame carries out rolling, and roughing rolling temperature is 980 ~ 1120 DEG C; The finish rolling stage is 7 passes, and finish rolling start rolling temperature is 950 ~ 1050 DEG C, and finish rolling end temp is 900 ~ 940 DEG C; After finish rolling, coiling temperature is 680 ~ 740 DEG C; Cold continuous rolling is rolled, and cold rolling draft is 70% ~ 90%; The hard state band steel that rolls after cold rolling is annealed through Horizontal Continuous Furnace, and be 810 ~ 850 DEG C in the annealing temperature of the soaking zone of Horizontal Continuous Furnace, 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, it is characterized in that, described finish rolling end temp is 910 ~ 920 DEG C.
8. the production method of a kind of gap-free atom cold rolling hot dip galvanizing steel plate as claimed in claim 6, it is characterized in that, after described finish rolling, coiling temperature is 700 ~ 740 DEG C.
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