CN1091166C - Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof - Google Patents
Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof Download PDFInfo
- Publication number
- CN1091166C CN1091166C CN 98100972 CN98100972A CN1091166C CN 1091166 C CN1091166 C CN 1091166C CN 98100972 CN98100972 CN 98100972 CN 98100972 A CN98100972 A CN 98100972A CN 1091166 C CN1091166 C CN 1091166C
- Authority
- CN
- China
- Prior art keywords
- weight
- cold
- steel strip
- rolled steel
- hot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The present invention relates to a cold-rolled steel strip or a hot-dipped cold-rolled steel strip used as a fire-proof building element, which comprises the chemical compositions of C, Si, Mn, P, S, Al, Mo, one or more of V and W, one or more of Co, Ni, Cr and B, and iron and impurities. To manufacture the cold-rolled steel strip, hot rolling, acid pickling and cold rolling are performed on the cold-rolled steel strip, and then, annealing at temperatures higher than the recrystallization temperature and lower than 950 DEG C. is performed on the cold-rolled steel strip. The hot-dipped cold-rolled steel strip is manufactured in the same way except that the hot-dipped cold-rolled steel strip is dipped in a plating bath after continuous heating carried out at temperatures higher than the recrystallization temperature and lower than 950 DEG C. With less load enabling the annealed or hot-dipped steel strip to produce the plastic strain from 1% to 5%, cold rolling can be further performed on the annealed or hot-dipped steel strip.
Description
The present invention relates to make cold-rolled steel strip and the hot dip process steel band that building materials use, also relevant simultaneously with the manufacture method of these two kinds of steel bands.
Fire-resistant coating has been applied on the building surface of fireproof construction necessity, raises so that prevent the steel temperature when catching fire.A kind of at high temperature have high-intensity what is called " fire-resistant steel " nowadays to be used, even buildings still keeps stable when steel are heated near 600 ℃ high temperature.Adopt this fire-resistant steel can be less with or without fire-resistant coating.Hot strength is represented with the yield strength under the high temperature usually.
This fire-resistant steel that has been used as the buildings primary member so far is normally thicker relatively the sort of in the hot rolled steel sheet.Though the steel sheet that is with or without hot dip process that the steel of this purposes also partly adopt cold-rolled steel strip to make.
Except primary member, auxilliary member, roof and wall also need steel in the fabric structure.These members usually adopt Cold Rolled Sheet Steel and the cold rolling steel sheet of hot dip process.When these class steel improved fire performance owing to the raising of its hot strength, they naturally also can equally with primary member have identical benefit so.On this meaning, also need cold-rolled steel strip or Cold-rolled steel strip of hot dip coating that fabulous fire performance is arranged.
Such Cold Rolled Sheet Steel be with hot rolled strip through cold rolling, annealing, operations such as hot dip process process.This steel sheet is processed into the required building slab of practical use with heavy duty sometimes.Therefore, steel sheet should have the hot strength of good formability and appropriateness.
The present invention is intended to propose can be used as the steel of fire-resistive construction member.This steel can be made hot strength and fabulous cold-rolled steel strip or the Cold-rolled steel strip of hot dip coating of formability.The acquisition of fabulous high-temperature behavior is by producing plastix strain and further raising to the control of steel band alloy ingredient and to steel band.
The fundamental component of the steel band that is used as the fire-resistive construction member of up-to-date proposition is as follows.0.01-0.25 the carbon of weight (wt.) %, up to the silicon of 1.5 weight %, the manganese of 0.05-2.5 weight %, up to the phosphorus of 0.1 weight %, up to the sulphur of 0.02 weight %, the aluminium of 0.005-0.1 weight %, 0.05-1.0 the molybdenum of weight %, all the other are iron basically, also have some unavoidable impurities.The elements such as one or more titaniums, niobium, vanadium and tungsten that can contain 0.005-0.2 weight % in the steel band, and/or the copper of one or more 0.05-0.6 weight %, the chromium of the nickel of 0.05-0.6 weight %, 0.05-3.0 weight % and the elements such as boron of 0.0003-0.003 weight %.
Cold-rolled steel strip as the fire-resistive construction member, its manufacturing processed is as follows: the slab with specific composition is 1000-1250 ℃ of heating down, hot rolling in the time of 800-950 ℃, in the time of 400-700 ℃, curl, pickling, compression ratio with 40-90% is cold rolling, anneals in being higher than the temperature range that recrystallization temperature is lower than 950 ℃ then.Can use box annealing or continuous annealing.
Making processes as the Cold-rolled steel strip of hot dip coating of fire-resistive construction member is as follows: in kind the cold-rolled steel strip of Huo Deing heats continuously to be higher than the temperature that recrystallization temperature is lower than 950 ℃ in the continuous hot-dipping device, immerses then in the hot dip process pond.
Any cold-rolled steel strip or hot dip process steel sheet can be further cold rolling with the slight load of the plastix strain of generation 1-5% in steel band after annealing or hot dip process respectively.From industrial point, cold rolling with little load, gear to actual circumstances most, though also can make and produce plastix strain in the steel band with tension load or aligning.The further cold rolling high-temperature behavior that helps to improve existing steel band.
The annealed back cold-rolled compression of curve display among Fig. 1 compares the relation with room temperature and 600 ℃ of following performances.
The inventor after deliberation and tested the impact of alloying element on the required elevated temperature strength of refractory steel member does not make again formability degenerate simultaneously.
Design is as the hot rolled strip of fire-resistive construction member, and its high-temperature behavior can be improved such as the such alloying element of molybdenum, tungsten, titanium or niobium by adding, and these alloying elements are dissolved in the steel matrix and as intermetallic compound separates out. On the other hand, cold-rolled strip or Cold-rolled steel strip of hot dip coating after cold rolling with the annealing temperature that is higher than recrystallization point with the raising formability, because the steel band formability of cold rolling mistake is poor.
Cold rolling annealing later can improve the adding that elevated temperature strength ascribes molybdenum to effectively, and the molybdenum role is with the same at the ordinary hot strip rolling that is used for the fire-resistive construction member, but the required elevated temperature strength of this purposes does not usually reach.
The inventor thinks, elevated temperature strength the reason such as is separated out unexpectedly during not owing to cold rolling after annealing and caused. In other words, the metallographic situation of cold-rolled strip or Cold-rolled steel strip of hot dip coating is different from hot rolled strip, because it is through cold rolling and annealing in process. On this meaning, will recommend simply the alloy designs of hot rolled strip and use on cold-rolled strip or the Cold-rolled steel strip of hot dip coating, it seems that just cold-rolled strip or Cold-rolled steel strip of hot dip coating are different on thickness from hot rolled strip, be little feasible.
Consider the metallographic hysteresis of cold-rolled strip or Cold-rolled steel strip of hot dip coating, the inventor has been found that, the adding of molybdenum is the most effective way in the alloy designs of recommending so far, and utilize molybdenum in specific composition dissolving and separate out and obtain favourable alloy designs to improve high-temperature behavior. Fire resistance and high-temperature behavior can also further improve by adding together the carbide former such as titanium, niobium, vanadium, tungsten. Guarantee as the control by annealing or hot-dip stage of the formability of the required steel band of building element.
The plastix strain that makes cold-rolled steel strip or Cold-rolled steel strip of hot dip coating produce 1-5% also can further improve hot strength.The generation of this little plastix strain makes steel band improve at the high temperature lower yield strength near 600 ℃, thereby provide the steel that can be used as the fire-resistive construction member, because its fire performance is fabulous, such plastix strain is in cold conditions rather than at the hot steel band that adds to.In fact this plastix strain adds to steel band with small reduction ratio with cold rolling process.
Can understand the synthetic design of being recommended from following explanation
C:0.01-0.25 weight %
Carbon is the alloying element that comes desired strength to steel band.Carbon becomes bigger to the influence of intensity more than carbon content reaches 0.01 weight %, but carbon content surpasses 0.25 weight % formability and weldability are degenerated.
Si: can reach 1.5 weight % at most
Silicon is the influential alloying element of a kind of raising to intensity, and still, silicon excessive that content surpasses 1.5 weight % adds affiliation makes steel hardening, ductility variation.Silicone content just can make no coating surface partly remain above 0.3 weight % on the motherboard of hot dip process doing.In this, silicon content should be controlled lowlyer.No coating surface partly remains this class shortcoming and can be inhibited by acierage on steel band or ferrous alloy, even if the steel band silicon content surpasses 0.3 weight %.On this meaning, silicon content is handled with quadrat method above the steel band of 1.5 weight % is also available.
Mn:0.05-2.5 weight %
Manganese joins in the steel in the steel-making stage as reductor, and it also suppresses the high-temperature brittleness that causes owing to the adding as the sulphur of impurity effectively.The influence of manganese reaches 0.05 weight % in its add-on and becomes obviously when above, adds affiliation and makes the ductility variation but content surpasses manganese excessive of 2.5 weight %.
P: up to 0.1 weight %
Phosphorus and copper match and help improving intensity and improve erosion resistance, add affiliation steel is become fragile but content surpasses phosphorus excessive of 0.1 weight %.
S: be not more than 0.02 weight %
Sulphur is the harmful element as the unavoidable impurities that stays.Sulphur content is few more, helps the effect of steel more, and the permission amount of the steel of recommendation is that sulphur content is no more than 0.02 weight %.
Al:0.005-0.1 weight %
Aluminium joins in the steel as reductor, it help N with the form stable existence of AlN in steel.The realization of this effect needs the add-on of aluminium to reach more than the 0.005 weight %, adds affiliation and makes formability and degraded appearance but content surpasses aluminium excessive of 0.1 weight %.
Mo:0.05-1.0 weight %
The additive molybdenum is dissolved in the steel matrix and with the carbide form and separates out, thereby improves its hot strength.Its this effect became obviously when the add-on of molybdenum met or exceeded 0.05 weight %, but saturated when 1.0 weight %.Surpass 1.0 weight % and make hardening of steel on the contrary, the ductility variation.
Ti, Nb, V, W: respectively be 0.005-0.2 weight %
These elements are additional additives, and they are separated out with its carbide form and be favourable to room temperature tensile property and hot strength.This effect just realizes above 0.005 weight % in the add-on of titanium, niobium, vanadium or tungsten.But this effect is just saturated when content reaches 0.2 weight %, and titanium, niobium, vanadium or the tungsten that surpasses 0.2 weight % can make steel hardening, ductility poor.
Cu:0.05-0.6 weight %
Copper is additional alloy addition, and it helps improving the erosion resistance of steel with phosphorus.This effect obviously when the add-on of copper is 0.05 weight %.But the high temperature cracking takes place in too much adding copper when impelling hot rolling on the contrary when surpassing 0.6 weight %.
Ni:0.05-0.6 weight %
Nickel is additional additive, the favourable and inhibition high-temperature brittleness to erosion resistance.This effect obviously when the add-on of nickel met or exceeded 0.05 weight %.But nickel is a kind of element of costliness, can improve steel-making cost, and no matter how much nickel content increases, even is added to more than the 0.6 weight %, be difficult to prediction to improved performance what.
Cr:0.05-3.0 weight %
Chromium is additional additive, and to corrosion-resistant favourable with raising hot strength, this gives the credit to separating out of carbide.This when the add-on of chromium surpasses 0.05 weight % Effect on Performance is just obviously got up, still, the excessive adding of chromium surpasses and makes the steel hardening on the contrary more than the 3.0 weight %, the ductility variation, and can further not improve erosion resistance and hot strength.
B:0.0003-0.003 weight %
Boron is a kind of additional additive, helps strengthening crystal boundary.The content of boron reach 0.0003 weight % when above its influence obviously, but it is just saturated to reach 0.003 weight %.
The steel of specific composition are cast slab with conventional continuous casting process, and hot rolling is to pre-determined thickness then.
In the hot rolling stage, slab is through insulation, and hot rolling is curled then.
When slab is heated to 1000 ℃ or when above, insulation impels alloying element to be dissolved in the steel matrix and slab is in can carry out the hot rolled state, but soaking temperature is too high, surpasses 1250 ℃ of red brittleness that can cause slab.
When being preferably in 800-950 ℃, hot rolling stops, to guarantee the supersaturation dissolving of alloying element in steel matrix, do not process the ferrite crystal grain that causes and can not stay, if finishing temperature is lower than 800 ℃, then alloying element can analyze at the steel matrix middle part, makes the hot strength variation.Can waste heat energy again but finishing temperature is higher than 950 ℃, strengthen the process furnace burden.
The good steel band of hot rolling curls in the time of 400-700 ℃, control curl temperature help curly course keep alloying element at dissolved state and can growing metal between compound etc.Owing to this dissolving, follow the steel band of cold rolling gained after annealing or the continuous heating, its high-temperature behavior is improved.
After this, the steel band of hot rolling was done pickling before cold rolling.
So it is cold rolling that steel band carries out under conventional state.Cold rollingly preferably carry out, so that at subsequently annealing or continuous hot-dipping stage accelerate recrystallisation with the compression ratio of 40-90%.The control of compression ratio also helps suppressing coarse grained formation that those meetings have a negative impact to formability.
When no Cold-rolled steel strip of hot dip coating was made, cold rolling intact steel band was directly sent to annealing.At annealing stage, steel band is heated to it more than recrystallization temperature, so that discharge fully carrying out by cold rolling strain that causes and accelerate recrystallisation; Not so the steel after the thermal treatment is very hard, and formability is not enough.On the other hand, when temperature is higher than 950 ℃, though steel band can soften, overheatedly caused coarse grained growth, coarse grained generation can reduce formability and make heat treated steel band appearance poor.
During the manufacturing of hot dip process steel band, through cold rolling steel band in the continuous hot-dipping device to be higher than its recrystallization temperature and to be lower than heating continuously in 950 ℃ the temperature.Heating is finished in reducing atmosphere continuously, to activate the steel band top layer and to make steel band annealing.
Continuously more than the temperature modulation recrystallization temperature of heating, not so, the cold rolling strained that causes is removed and recrystallize all is not enough concerning the softening of steel band.Be lower than Heating temperature and also make steel band activate inadequately, after hot dip process, stay no coated surface.On the contrary, when temperature is higher than 950 ℃, overheatedly make grain coarsening, surface imperfection and so on perhaps occurs.
Then, the steel band after the continuous heating is immersed in the hot dip process pond of continuous hot-dipping device.The hot dip process pond can be Zn, Al or Zn-Al.Plate Zn, the steel band of Al or Zn-Al coating is exactly to obtain in this way.
Cold-rolled steel strip of making as stated above or Cold-rolled steel strip of hot dip coating can also remake cold rolling, make steel band produce the plastix strain of 1-5%.Increase the hot strength that plastix strain helps improving steel band.
Plastix strain is found by the inventor recently to the influence of hot strength.Hot strength increases with the plastix strain degree, can be used on compression ratio and represent plastix strain in the above-mentioned cold rolling stage that adds little load.
Fig. 1 illustrates the influence of the mechanical property of cold-rolled compression comparison room temperature and 600 ℃, wherein the composition of steel is: the carbon of 0.09 weight %, 0.05 the silicon of weight %, 0.55 the manganese of weight %, the phosphorus of 0.012 weight %, the sulphur of 0.006 weight %, 0.035 the aluminium of weight %, 0.31 the molybdenum of weight %, the vanadium of 0.07 weight %, all the other are iron and some unavoidable impurities.Steel through hot rolling, cold rolling, 800 ℃ of following 1 fen kinds of annealing, and then cold rolling.
Notice that from Fig. 1 600 ℃ of yield strengths strengthen with the raising of cold-rolled compression ratio.The raising of this mechanical property is just obviously found out greater than 1% o'clock at compression ratio.Though compression ratio surpasses at 5% o'clock 600 ℃ of high yield strengths can be arranged, the unit elongation during room temperature has descended on the contrary.The reduction of unit elongation means that the formability of cold-rolled steel strip or hot dip process steel band has degenerated.As can be known from these results, the cold rolling compression ratio in annealing back preferably is controlled in the 1-5% scope.
Embodiment 1
Each steel grade that composition shown in the table 1 is determined is through melting and cast slab.Slab becomes the steel band of 4.0 mm thick through forging and hot rolling.Steel band after the hot rolling is annealed under the various different conditions shown in the table 2 through cold rolling one-tenth 1.0 mm thick again.
Downcut sample from every kind of steel band according to said method making, and under room temperature and 600 ℃, carry out tension test.The test-results that adds annealing temperature is shown in table 2.
Notice that from table 2 steel band of specific composition is made comparisons with suitable sample after 650-950 ℃ of annealing, yield strength when having enough ductility and higher 600 ℃ under the room temperature.Therefore see that the steel band in the scope of the invention can be used as the fabulous fire-resistive construction member of high-temperature behavior.
The alloy ingredient of used steel grade among table 1: the embodiment 1
| Steel Mark | Component and content (unit: weight %) | Remarks | ||||||||||||||
| C | Si | Mn | P | S | Al | Cu | Ni | Cr | Mo | Ti | Nb | V | W | B | ||
| I | 0.13 | 0.02 | 0.55 | 0.011 | 0.016 | 0.022 | 0.01 | 0.01 | 0.01 | - | - | - | - | - | - | Comparing embodiment |
| II | 0.11 | 0.01 | 0.68 | 0.006 | 0.011 | 0.042 | 0.02 | 0.01 | 0.02 | - | 0.155 | - | - | - | - | |
| III | 0.12 | 0.35 | 0.75 | 0.009 | 0.002 | 0.034 | 0.01 | 0.02 | 0.02 | - | - | 0.022 | - | - | - | |
| IV | 0.15 | 0.02 | 0.45 | 0.008 | 0.005 | 0.040 | 0.02 | 0.01 | 0.01 | 0.32 | - | - | - | - | - | The present invention |
| V | 0.12 | 0.02 | 0.48 | 0.008 | 0.007 | 0.030 | 0.01 | 0.01 | 0.03 | 0.31 | 0.050 | - | - | - | - | |
| VI | 0.10 | 0.01 | 0.54 | 0.010 | 0.004 | 0.047 | 0.50 | 0.43 | 0.02 | 0.35 | - | 0.030 | - | - | - | |
| VII | 0.12 | 0.02 | 1.23 | 0.012 | 0.007 | 0.029 | 0.02 | 0.01 | 0.02 | 0.52 | - | - | 0.080 | - | - | |
| VIII | 0.13 | 0.44 | 0.45 | 0.009 | 0.006 | 0.036 | 0.01 | 0.02 | 0.01 | 0.19 | - | - | 0.090 | - | - | |
| IX | 0.09 | 0.03 | 1.45 | 0.010 | 0.006 | 0.037 | 0.02 | 0.01 | 0.02 | 0.42 | - | - | - | 0.080 | - | |
| X | 0.08 | 0.06 | 0.77 | 0.012 | 0.009 | 0.031 | 0.01 | 0.01 | 0.02 | 0.32 | - | - | 0.095 | 0.015 | - | |
| XI | 0.20 | 0.05 | 2.15 | 0.011 | 0.004 | 0.055 | 0.01 | 0.01 | 0.55 | 0.30 | - | - | - | - | 0.002 | |
Table 2: the influence of cold-rolled steel strip tensile property during annealing temperature
| Embodiment number | Steel Mark | Annealing temperature (℃) | The room temperature tensile property | Yield strength in the time of 600 ℃ (MPa) | Remarks | ||
| Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | |||||
| 1 | I | 820 | 493 | 360 | 35 | 98 | Comparing |
| 2 | II | 820 | 480 | 379 | 30 | 107 | Comparing embodiment |
| 3 | III | 820 | 462 | 364 | 32 | 115 | Comparing |
| 4 | IV | 600 | 576 | 555 | 11 | 220 | Comparing embodiment |
| 5 | IV | 850 | 449 | 341 | 35 | 164 | The present invention |
| 6 | V | 820 | 503 | 414 | 30 | 176 | The present invention |
| 7 | VI | 850 | 481 | 385 | 31 | 170 | The |
| 8 | VII | 600 | 586 | 553 | 9 | 259 | Comparing embodiment |
| 9 | VII | 850 | 462 | 371 | 35 | 167 | The |
| 10 | VIII | 800 | 494 | 391 | 32 | 178 | The present invention |
| 11 | IX | 780 | 481 | 375 | 34 | 172 | The present invention |
| 12 | X | 850 | 501 | 411 | 32 | 184 | The present invention |
| 13 | XI | 850 | 610 | 488 | 26 | 181 | The present invention |
The slab that composition shown in the table 3 is determined is all prepared by continuous casting process.This slab is incubated and is rolled into the thickness of 2.3-3.0 millimeter under 1150-1200 ℃, finishing temperature is 850-870 ℃, curls down at 550-580 ℃ again.The thickness of the cold rolling one-tenth of this hot rolled strip 0.8-1.2 millimeter then.
The steel band of one group of cold rolling mistake is delivered on the continuous annealing service line, and all the other steel bands are delivered on the hot dip process service line.Every coil band in the continuous annealing service line heated 40 seconds down at 820 ℃, and cool to room temperature is done or do not done overaging and handles then.Each steel band is 800 ℃ of following continuous annealings 35 seconds in the continuous hot-dipping service line, is cooled to 500 ℃ near the painted groove temperature, is immersed in then in fused Zn or the Zn-5%Al pond.
The sample that downcuts on every volume cold-rolled steel strip or hot dip process steel band carries out room temperature and 600 ℃ of tension tests, and test-results is as shown in table 4.
As seen from Table 4, the specific composition of every volume also moves back the cold-rolled steel strip or the hot dip process steel band that overdo and all can be used as the fire-resistive construction member under specified temp because with suitable steel band relatively, ductility is fabulous under the room temperature, the hot strength under 600 ℃ is also high.
The alloy ingredient of the steel grade that table 3: embodiment 2 is used
| Steel Mark | Component and content (unit: heavy %) | Remarks | |||||||||||||
| C | Si | Mn | P | S | Al | Cu | Ni | Cr | Mo | Ti | Nb | V | W | ||
| XII | 0.13 | 0.01 | 0.45 | 0.011 | 0.005 | 0.022 | 0.01 | 0.01 | 0.03 | - | - | - | - | - | Comparing embodiment |
| XIII | 0.10 | 0.01 | 0.55 | 0.010 | 0.008 | 0.028 | 0.01 | 0.01 | 0.40 | 0.38 | - | - | - | - | The present invention |
| XIV | 0.08 | 0.50 | 0.87 | 0.012 | 0.005 | 0.035 | 0.49 | 0.45 | 0.02 | 0.41 | - | - | 0.075 | 0.015 | The present invention |
Table 4: annealing temperature is to the influence of cold-rolled steel strip and Cold-rolled steel strip of hot dip coating tensile property
Annotate: technology 1 refers to the cold-rolled steel strip anneal of not hot dip process.
| Embodiment number | Steel Mark | Technology * | Heating temperature (℃) | Sample thickness (mm) | The room temperature tensile property | Yield strength in the time of 600 ℃ (MPa) | Remarks | ||
| Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | |||||||
| 14 | XII | 1 | 820 | 1.0 | 445 | 344 | 33 | 101 | Comparing embodiment |
| 15 | | 2 | 800 | 1.0 | 448 | 362 | 31 | 95 | |
| 16 | XIII | 1 | 820 | 0.8 | 439 | 374 | 32 | 164 | The present invention |
| 17 | | 2 | 800 | 0.8 | 449 | 385 | 29 | 163 | |
| 18 | XIII | 3 | 800 | 0.8 | 452 | 381 | 28 | 171 | |
| 19 | XIV | 1 | 820 | 1.0 | 493 | 392 | 30 | 176 | |
| 20 | | 2 | 800 | 1.0 | 488 | 389 | 28 | 181 | |
Technology 3 refers to the continuous Heating temperature before the hot dip process of Zn-5%Al layer.
Heating temperature is annealing temperature or the continuous Heating temperature before hot dip process.
Embodiment 3
Each steel grade that composition shown in the table 5 is determined is through melting, and casting is forged, then the steel band of hot rolling to 4.0 millimeter thickness.The steel band of hot rolling is cold rolled to 1.0 mm thick again, and this cold-rolled steel strip heats 1 fen kind down at 800 ℃, and anneal is made in cooling in atmosphere then.Move back the steel band that overdoes with one group and do the further cold rolling plastix strain that makes it to produce with little load.
Downcut the tension test of sample from every coil band as room temperature and 600 ℃.Test-results is shown in table 6.Notice that from table 6 the specific steel band of composition can be made fire retarding component after the plastix strain that adds 1-5% because with suitable steel band relatively, it has high yield strength when fabulous ductility and 600 ℃ are at room temperature arranged.
The alloy ingredient of the steel grade that table 5: embodiment 3 is used
| Steel Mark | Component and content (unit: weight %) | Remarks | ||||||||||||||
| C | Si | Mn | P | S | Al | Cu | Ni | Cr | Mo | Ti | Nb | V | W | B | ||
| XV | 0.13 | 0.04 | 0.55 | 0.011 | 0.006 | 0.028 | 0.01 | 0.01 | 0.02 | - | - | - | - | - | - | Comparing embodiment |
| XVI | 0.15 | 0.02 | 0.45 | 0.013 | 0.005 | 0.030 | 0.02 | 0.01 | 0.01 | 0.32 | - | - | - | - | - | The present invention |
| XVII | 0.05 | 0.34 | 0.68 | 0.008 | 0.010 | 0.042 | 0.02 | 0.01 | 0.03 | - | - | 0.045 | - | - | - | Comparing embodiment |
| XVIII | 0.11 | 0.02 | 1.45 | 0.010 | 0.008 | 0.031 | 0.01 | 0.01 | 0.02 | 0.42 | - | - | - | 0.08 | - | The present invention |
| XIX | 0.08 | 0.01 | 0.54 | 0.011 | 0.004 | 0.033 | 0.02 | 0.01 | 0.03 | 0.35 | - | 0.030 | - | - | - | The present invention |
| XX | 0.20 | 0.02 | 0.48 | 0.009 | 0.006 | 0.030 | 0.01 | 0.01 | 0.02 | 0.31 | 0.050 | - | - | - | - | The present invention |
| XXI | 0.05 | 0.04 | 0.54 | 0.012 | 0.007 | 0.035 | 0.05 | 0.44 | 0.01 | 0.30 | - | - | - | - | - | The present invention |
| XXII | 0.08 | 0.03 | 0.77 | 0.014 | 0.006 | 0.038 | 0.01 | 0.01 | 0.02 | 0.32 | - | - | 0.095 | 0.01 | - | The present invention |
| XXIII | 0.13 | 0.03 | 1.44 | 0.010 | 0.004 | 0.043 | 0.01 | 0.01 | 0.03 | 0.35 | - | - | - | - | - | The present invention |
| XXIV | 0.12 | 0.02 | 0.75 | 0.009 | 0.003 | 0.033 | 0.02 | 0.02 | 0.02 | - | 0.155 | 0.022 | - | - | - | Comparing embodiment |
| XXV | 0.05 | 0.04 | 2.15 | 0.013 | 0.007 | 0.053 | 0.01 | 0.01 | 0.55 | 0.30 | - | - | - | - | 0.002 | The present invention |
| XXVI | 0.08 | 0.03 | 1.23 | 0.014 | 0.012 | 0.029 | 0.02 | 0.01 | 0.03 | 0.52 | - | - | 0.080 | - | - | The present invention |
| XXVII | 0.10 | 0.55 | 0.45 | 0.011 | 0.006 | 0.036 | 0.01 | 0.02 | 0.02 | 0.12 | - | - | - | 0.09 | - | The present invention |
Table 6: the influence of cold-rolled compression comparison room temperature and 600 ℃ of tensile properties
| Embodiment number | Steel Mark | Cold-rolled compression after the annealing is than (%) | The room temperature tensile property | Yield strength in the time of 600 ℃ (MPa) | Remarks | ||
| Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | |||||
| 21 | XV | 2.5 | 413 | 370 | 38 | 98 | Comparing embodiment |
| 22 | | 2 | 542 | 474 | 29 | 257 | The present invention |
| 23 | XVI | 7 | 576 | 545 | 14 | 270 | Comparing embodiment |
| 24 | XVII | 0 | 449 | 381 | 32 | 114 | Comparing embodiment |
| 25 | | 6 | 463 | 441 | 13 | 230 | Comparing embodiment |
| 26 | XVIII | 2.5 | 521 | 465 | 26 | 239 | The present invention |
| 27 | | 2 | 456 | 401 | 28 | 189 | The present invention |
| 28 | XX | 1.5 | 622 | 531 | 23 | 267 | The present invention |
| 29 | XXI | 3 | 481 | 425 | 26 | 202 | The |
| 30 | XXI | 7 | 499 | 476 | 13 | 219 | Comparing embodiment |
| 31 | XXII | 2.5 | 453 | 401 | 29 | 201 | The present invention |
| 32 | XXIII | 1.5 | 630 | 552 | 23 | 248 | The present invention |
| 33 | | 2 | 596 | 508 | 24 | 241 | The present invention |
| 34 | XXVI | 2.5 | 563 | 507 | 28 | 236 | The present invention |
| 35 | | 2 | 511 | 464 | 29 | 198 | The present invention |
The slab that composition shown in the table 7 is determined all prepares with continuous casting process.This slab is rolled into the steel band of 2.3-3.0 mm thick 1180-1210 ℃ of insulation down, and finishing temperature is 840-870 ℃, curls down at 530-580 ℃ then.The cold rolling one-tenth of the steel band that hot rolling is good 0.6-1.0 mm thick.
One group of cold-rolled steel strip of making is in this way delivered on the continuous annealing service line, and the steel band of other group is delivered on the hot dip process service line.In annealing line, steel band heated 40 seconds down at 800 ℃, and cool to room temperature is done or do not done overaging and handles then.In the hot dip process service line, every steel band heated 35 seconds down continuously at 800 ℃, was cooled near 500 ℃ that plate the pond temperature, was immersed into then in the plating pond.The plating pond is done in the Zn of fusing or the molten bath of Zn-5%Al.
Every steel band after the annealing or carry out with little load after the hot dip process cold rolling, thereby produce plastix strain.
Downcut the tension test usefulness of sample for room temperature and 600 ℃ from every cold-rolled steel strip and hot dip process steel band, test-results is shown in table 8.Notice that from table 8 the specific steel band of composition can be used as fire retarding component after the plastix strain that gives 1-5% because with suitable steel band relatively under the room temperature ductility good, yield strength height in the time of 600 ℃.
The alloy ingredient of table 7: embodiment 4 used steel grades
| Steel Mark | Component and content (unit: weight %) | Remarks | |||||||||||||
| C | Si | Mn | P | S | Al | Cu | Ni | Cr | Mo | Ti | Nb | V | W | ||
| XXVIII | 0.09 | 0.01 | 0.51 | 0.014 | 0.004 | 0.029 | 0.01 | 0.01 | 0.03 | - | 0.050 | 0.040 | - | - | Comparing embodiment |
| XXIX | 0.07 | 0.41 | 0.52 | 0.012 | 0.008 | 0.031 | 0.55 | 0.46 | 0.40 | 0.35 | - | - | - | - | The present invention |
| XXX | 0.08 | 0.03 | 0.77 | 0.011 | 0.006 | 0.038 | 0.02 | 0.02 | 0.02 | 0.35 | - | - | 0.065 | 0.010 | |
| XXXI | 0.11 | 0.25 | 1.08 | 0.008 | 0.010 | 0.039 | 0.02 | 0.01 | 0.01 | 0.45 | - | 0.025 | - | - | |
Table 8: the influence of cold-rolled compression comparison cold-rolled steel strip and hot dip process steel band tensile property when room temperature and 600 ℃
Annotate: technology 1 refers to that Cold-rolled steel strip of hot dip coating is not made anneal.
| Embodiment number | Steel Mark | Technology * | Compression ratio (%) | Sample thickness (mm) | The room temperature tensile property | Yield strength in the time of 600 ℃ (MPa) | Remarks | ||
| Tensile strength (MPa) | Yield strength (MPa) | Unit elongation (%) | |||||||
| 36 | | 2 | 0 | 1.0 | 595 | 510 | 28 | 121 | Comparing embodiment |
| 37 | | 2 | 3 | 1.0 | 601 | 562 | 25 | 140 | Comparing embodiment |
| 38 | XXIX | 1 | 3 | 0.8 | 462 | 420 | 29 | 200 | The present invention |
| 39 | XXIX | 1 | 6 | 0.8 | 478 | 454 | 14 | 227 | Comparing embodiment |
| 40 | XXX | 1 | 2.5 | 0.8 | 468 | 429 | 27 | 214 | The present invention |
| 41 | XXX | 1 | 8 | 0.8 | 487 | 465 | 13 | 222 | Comparing embodiment |
| 42 | | 2 | 1.5 | 0.8 | 467 | 438 | 27 | 208 | The present invention |
| 43 | | 2 | 3.5 | 0.8 | 477 | 450 | 26 | 212 | The present invention |
| 44 | XXX | 3 | 2 | 0.8 | 461 | 431 | 25 | 207 | The present invention |
| 45 | XXXI | 1 | 2 | 0.6 | 552 | 513 | 24 | 238 | The present invention |
Technology 3 refers to Zn-5%Al layer Cold-rolled steel strip of hot dip coating.
Compression ratio is the annealing back value when cold rolling.
Said cold-rolled steel strip or Cold-rolled steel strip of hot dip coating have fabulous formability and possess as the required high-temperature behavior of fire-resistive construction member according to the present invention.Owing to anneal or hot dip process does not need making processes is done any variation from making steel to, so from industrial point, this steel band is easily manufactured, and steel band applies little load again after annealing or hot dip process carries out cold rollingly also can further improve its fire performance with the plastix strain that produces 1-5%.
Claims (8)
1. cold-rolled steel strip as the fire-resistive construction member, its composition is: the carbon of 0.01-0.25 weight %, silicon up to 1.5 weight %, 0.05-2.5 the manganese of weight %, the phosphorus of 0.008-0.1 weight % is no more than the sulphur of 0.02 weight %, 0.005-0.1 the aluminium of weight %, 0.05-1.0 the molybdenum of weight %, all the other mainly are iron and some unavoidable impurities.
2. as the cold-rolled steel strip of regulation in the claim 1, also having content respectively is one or more elements in titanium, niobium, vanadium and the tungsten of 0.005-0.2 weight %.
3. as the cold-rolled steel strip of claim 1 regulation, also contain the copper of 0.05-0.6 weight %, the nickel of 0.05-0.6 weight %, one or more in these several elements of boron of the chromium of 0.05-3.0 weight % and 0.0003-0.003 weight %.
4. as the cold-rolled steel strip of claim 1 regulation, also having content respectively is in the titanium, niobium, vanadium, W elements of 0.005-0.2 weight % one or more; The copper that also has 0.05-0.6 weight % simultaneously, the nickel of 0.05-0.6 weight %, one or more in these several elements of boron of the chromium of 0.05-3.0 weight % and 0.0003-0.003 weight %.
5. as the cold-rolled steel strip of each defined in the claim 1 to 4, it is characterized in that described cold-rolled steel strip is coated with electrolytic coating.
6. manufacture method as the cold-rolled steel strip of fire-resistive construction member comprises following a few step:
The preparation slab, its composition is: the carbon of 0.01-0.25 weight %, silicon up to 1.5 weight %, 0.05-2.5 the manganese of weight %, 0.008-0.1 the phosphorus of weight %, be not more than the sulphur of 0.02 weight %, 0.005-0.1 the aluminium of weight %, 0.05-1.0 the molybdenum of weight %, can also add content and respectively be the titanium of 0.005-0.2 weight %, niobium, vanadium, the copper of in the W elements one or more and 0.05-0.6 weight %, the nickel of 0.05-0.6 weight %, 0.05-3.0 weight % chromium, 0.0003-0.003 one or more in the boron of weight %, all the other are iron and some unavoidable impurity basically;
This slab of heating under 1000-1250 ℃ of temperature;
With the slab hot rolling of heating, finishing temperature is 800-950 ℃;
Steel band under 400-700 ℃ of temperature that hot rolling is good curls;
This hot rolled strip is done pickling;
The steel band of pickling is cold rolling with the compression ratio of 40-90%;
After cold rolling,
To be higher than the temperature that recrystallization temperature is lower than 950 ℃ cold rolling good steel band is annealed; And
Apply little load and carry out the cold rolling plastix strain that makes it to produce 1-5% moving back the steel band that overdoes alternatively.
7. as the method for claim 6 regulation, cold-rolled steel strip is wherein done pot annealing or is done continuous annealing and handle.
8. as the method for claim 6 defined, it is characterized in that, after described cold rolling step,
In the continuous hot-dipping device to be higher than the continuous cold rolling good steel band of heating of temperature that its recrystallization temperature is lower than 950 ℃;
The steel band that heated continuously is immersed in the hot dip process pond; And
Make the good steel band of hot dip process cold rolling with little load alternatively, make this steel band produce the plastix strain of 1-5%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100972 CN1091166C (en) | 1998-03-27 | 1998-03-27 | Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof |
| HK99105917A HK1020997A1 (en) | 1998-03-27 | 1999-12-16 | Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98100972 CN1091166C (en) | 1998-03-27 | 1998-03-27 | Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1230602A CN1230602A (en) | 1999-10-06 |
| CN1091166C true CN1091166C (en) | 2002-09-18 |
Family
ID=5216382
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98100972 Expired - Fee Related CN1091166C (en) | 1998-03-27 | 1998-03-27 | Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1091166C (en) |
| HK (1) | HK1020997A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2844281B1 (en) * | 2002-09-06 | 2005-04-29 | Usinor | HIGH MECHANICAL STRENGTH STEEL AND METHOD OF MANUFACTURING SHEET OF ZINC-COATED STEEL OR ZINC ALLOY STEEL |
| CN100430505C (en) * | 2005-09-29 | 2008-11-05 | 宝山钢铁股份有限公司 | Superhigh-strength cold rolling band steel with anti-tensile strength above 880Mpa and its production |
| CN103361568B (en) * | 2013-05-28 | 2016-06-22 | 国际冷弯型钢学会有限公司 | A kind of fire-resistant and weather-resistant structural steel and manufacture method thereof |
| CN104611632A (en) * | 2015-02-10 | 2015-05-13 | 苏州科胜仓储物流设备有限公司 | Wear-resistant and impact-resistant section bar for bracket beam and welding process thereof |
| CN113970031B (en) * | 2020-10-23 | 2024-05-07 | 深圳优易材料科技有限公司 | Inner wall wear-resistant pipe and preparation method thereof |
-
1998
- 1998-03-27 CN CN 98100972 patent/CN1091166C/en not_active Expired - Fee Related
-
1999
- 1999-12-16 HK HK99105917A patent/HK1020997A1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1230602A (en) | 1999-10-06 |
| HK1020997A1 (en) | 2000-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1169991C (en) | Thin steel plate with good machining performance and formed precision and its mfg. method | |
| CN1147611C (en) | Cold rolled steel sheet and hot rolled steel sheet excellent in bake hardenability and resistance to ordinary temperatureaging and method for their production | |
| CN1147610C (en) | High tensile cold-rolled steel sheet excellent in ductility and in strain ageing hardening properties, and method for producing same | |
| CN1252302C (en) | Cold-rolled steel plate having superfine grained structure and manufacturing method thereof | |
| CN1661127A (en) | High strength cold rolled steel sheet and method for manufacturing the same | |
| CN1455821A (en) | Sheet steel and method for producing thereof | |
| WO2016103535A1 (en) | High-strength hot-dip galvanized steel sheet and manufacturing method thereof | |
| CN1419607A (en) | Composite structure type hipe tensile strength steel plate, plated plate of composite structure type high tensile strength steel and method for their production | |
| JP6223905B2 (en) | High strength galvannealed steel sheet with excellent yield strength and workability | |
| CN1788099A (en) | High strength steel plate excellent in formability and method for production thereof | |
| JP5958667B1 (en) | High-strength hot-dip galvanized steel sheet and manufacturing method thereof | |
| CN1771348A (en) | Hot dip alloyed zinc coated steel sheet and method for production thereof | |
| JP7216358B2 (en) | Hot press-formed member with excellent resistance to hydrogen embrittlement and method for producing the same | |
| CN1395623A (en) | High tensile strength hot dip plated steel sheet and method for production thereof | |
| KR102119017B1 (en) | High strength cold rolled thin steel sheet and method for manufacturing the same | |
| CN1780928A (en) | High strength cold rolled steel sheet and method for production thereof | |
| JP3587126B2 (en) | High tensile hot-dip galvanized steel sheet excellent in ductility and method for producing the same | |
| JP3820868B2 (en) | Method for producing high-tensile hot-dip galvanized steel sheet with excellent ductility | |
| KR102450998B1 (en) | STEEL SHEET PLATED WITH Al-Fe ALLOY FOR HOT PRESS FORMING HAVING EXCELLENT CORROSION RESISTANCE, HOT PRESS FORMED PART, AND HEAT RESISTANCE, AND MANUFACTURING METHOD THE SAME | |
| CN1091166C (en) | Cold-rolled steel strip and hot-dip coated cold-rolled steel strip for use as building material manufacturing method thereof | |
| JP7251010B2 (en) | ALUMINUM-IRON ALLOY PLATED STEEL PLATE FOR HOT FORMING WITH EXCELLENT CORROSION RESISTANCE AND HEAT RESISTANCE, HOT PRESS-FORMED MEMBER, AND PRODUCTION METHOD THEREOF | |
| JP3624772B2 (en) | Low yield ratio high-tensile hot-dip galvanized steel sheet excellent in ductility and manufacturing method thereof | |
| JP2007031771A (en) | High strength steel thin sheet excellent in fatigue characteristic, hardenability in coating/baking and cold-aging resistance, and method for producing the same | |
| CN1100885C (en) | Method of manufacturing cold rolled steel sheet excellent in resistance to natural aging and panel properties | |
| JP4333352B2 (en) | Method for producing high-strength cold-rolled steel sheet excellent in ductility and stretch flangeability |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| CI02 | Correction of invention patent application |
Correction item: Denomination of Invention Correct: ...... Hot dip cold rolled steel strip...... False: Cold rolled steel strips and hot-dip coated cold rolled steel strips for building materials and methods of making the same Number: 40 Page: The title page Volume: 15 |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTION NAME; FROM: USED AS BUILDING MATERIALS AND THE COLD-ROLLED STEEL STRIP COLD ROLLING STEEL STRIP HOT-DIPPED AND THEIR MANUFACTURING METHODS TO: COLD-ROLLED STEEL STRIP OF HOT DIP COATING |
|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020918 Termination date: 20160327 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |