CN101481778B - Austenic stainless steel strip and manufacturing method thereof - Google Patents
Austenic stainless steel strip and manufacturing method thereof Download PDFInfo
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- CN101481778B CN101481778B CN2008100323290A CN200810032329A CN101481778B CN 101481778 B CN101481778 B CN 101481778B CN 2008100323290 A CN2008100323290 A CN 2008100323290A CN 200810032329 A CN200810032329 A CN 200810032329A CN 101481778 B CN101481778 B CN 101481778B
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Abstract
The invention discloses an austenitic stainless steel belt and a manufacturing method thereof. The invention is characterized by comprising the following chemical elements in terms of weight percentage: 0.04 to 0.12 percent of C, 0.4 to 1. percent of Si, 0.8 to 2 percent of Mn, less than or equal to 0.04 percent of P, less than or equal to 0.03 percent of S, 17 to 19 percent of Cr, 7 to 10 percent of Ni, 0.25 to 0.5 percent of Cu and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting; continuous casting with thin belts; control of cooling and winding; acid pickling, direct cold rolling and annealing; acid pickling again and cold rolling to achieve the thickness of a finished product; annealing after achieving the thickness of the finished belt steel, acid pickling, leveling, and length cutting into a finished coil. By utilizing the element of Cu, the invention reduces the use amount of Ni in the steel, reduces the production cost, simultaneously reduces the content of the residual ferrite in the steel, improves the wearing resistance of the steel, adopts direct cold rolling to match the high-temperature annealing procedure, and saves the procedures of hot rolling and solution treatment so as to lead the production process to be simple and stable.
Description
Technical field
The present invention relates to the stainless steel metallurgical technology, belong to a kind of austenic stainless steel belt and manufacture method thereof especially.
Background technology
Stainless steel is with good solidity to corrosion, high thermal resistance, and high-strong toughness, exquisite appearance and good characteristics such as processing forming are widely used in aspects such as food machinery, sanitary facility, kitchen, building decoration, automobile, chemical industry and electric equipment products.In stainless steel market, the demand of stainless steel materials accounts for more than 80%, and this wherein main product is the stainless-steel cold-rolling thin plate.
The production technique of traditional Stainless Steel Band is that hot rolling and cold rolling process are finished by continuous casting (or mould notes+forging).The thickness of strand is 200mm in general traditional continuous casting process.Stainless hot rolling production technique has two kinds of continous way hot strip rolling mill and modern Steckel mills.These two kinds of production technique were identical at roughing mill in the past.The cross dimensions of steel billet mostly is (180～200mm) * (1050～2550) mm.Steel billet heats at walking beam heating furnace.The steel billet of coming out of the stove is back and forth rolling through carrying out 5～7 passages at the four roller reversible roughing mills that have edger roll behind the dephosphorize by high pressure water, is rolled down to 30～50mm, sends into finishing train or Steckel mill, is rolled down to finished product thickness, finishes the hot rolling production process of band steel.The production technique of stainless-steel cold-rolling band steel is mainly to be to soften on hot rolled strip continuous annealing pickling unit and remove iron scale and handle.Carry out cold rollingly then, the band steel after cold rolling carries out recrystallize softening annealing and pickling at cold-rolled steel strip continuous annealing pickling unit; The finished product cold rolled strip improves plate shape through smooth unit, through rip cutting (coil of strip delivery) or crosscut (spiral-plate delivery) unit, finishes the production of cold rolled strip.
Above-mentioned is the production technique of traditional stainless steel strip.At eighties of last century beginning of the nineties at the end of the eighties, compact band steel production technique (Compact Strip Production, be called for short CSP) at first obtain commercialization in U.S. Niu Ke company, it is characterized by CSP, technical process is: electric furnace or converter provide molten steel → continuous casting → soaking pit soaking → hot continuous rolling → batch.Along with the development of thin plate blank continuously casting and continuously rolling technology, stainless steel also can be produced with continuous casting and rolling technique of sheet bar.This technology is compared maximum characteristics with traditional technology be that the slab thickness of continuous casting is 50～90mm, because original strand is thin, the hot rolling unit does not need roughing mill (if the thick 50mm of base), or only needs 1 roughing mill (base thick 70～90mm).And roughing mill will roll several passages repeatedly and strand could be thinned to the specification that needs before the finish rolling in the traditional technology.Strand is wanted reheat after overcooling earlier in the traditional technology in addition, advance roughing mill again, and strand is directly rolling without cooling in the continuous casting and rolling technique of sheet bar, so the soaking pit before the hot rolling unit only need be mended temperature.Therefore this technology has shortened flow process greatly than above-mentioned traditional technology, has reduced energy consumption, has saved the energy.
The continuous casting technology that upgrades than CSP is strip continuous casting technology (Strip CastingProcess), the principal feature of its production technique is exactly molten steel has the circulation cooling effect by a pair of inside a casting roller, through Quench, solidify back direct pouring and go out the thick Cast Strip of 1～5mm, rolling is batched after through the online hot rolling of a time (or not having hot rolling) in the Cast Strip.More specifically, as shown in Figure 1, the molten steel that will meet the composition requirement enters in the water-cooled crystallization roller 4 of rotation and the molten bath that side seal board 5 forms through tundish 2 and submerged nozzle 3 from ladle 1, cooling through water-cooled crystallization roller 4 forms 1～5mm Cast Strip 6, the Cast Strip is through pinch roll 7 and rollgang 8 and cooling controller 9, through pinch roll 10 before batching, enter reeling machine 11 rolling then.As seen, sheet-band continuous casting and rolling technology can be simplified production technique to a greater degree, shortens the production cycle, obviously reduce energy consumption and production costs.
Simultaneously, because thin strap continuous casting is all different with traditional flow process and bar strip continuous casting and rolling flow path at aspects such as the process of setting feature of metallurgical technology flow process, material, phase transformation history, the material of producing, its tissue and performance and traditional technology are compared the characteristics that self uniqueness is arranged with CSP technology, the basic characteristics that its setting rate is fast, composition is even, degree of segregation is little, crystal grain is tiny bring optimistic prospect for the investigation of materials worker, produce some steel grades that high alloy content, traditional technology easily produce segregation with it and have special advantages.
In thin strap continuous casting was produced, because the chilling action of crystallization roller, alloy also solidified under the condition away from thermodynamic(al)equilibrium, and it is delta ferrite to have occurred in the monophasic austenitic stainless steel originally that this nonequilibrium freezing makes.This is one of subject matter of thin strap continuous casting austenitic stainless steel.Ferrite in the austenitic stainless steel reaches certain content, and the aggravation of crackle tendency also causes pitting corrosion resistance to descend simultaneously in the time of will making hot-work, reduces the use properties of steel greatly.The method of minimizing ferrite content commonly used is to reduce the Cr/Ni equivalence ratio, so just needs to increase the content of Ni, and Ni is expensive strategic element, and production cost will be increased greatly.Therefore how to reduce ferrite content in the austenitic stainless steel and be and need the problem that solves in the austenitic stainless steel thin strap continuous casting technology.In addition, in order to improve stainless comprehensive use properties, traditional technology comprises that sheet blank continuous casting even thin strap continuous casting generally all need hot rolling or solution treatment, and tissue and performance after hot rolling or the solution treatment are more even, and not only the intensity height of material but also plasticity might as well.Make the thin strap continuous casting stainless steel without hot rolling or solution treatment if can develop a kind of production technique, also can reach the performance that is not less than stainless steel product under the traditional technology, production cost then reduces greatly.
U.S. Patent Publication No. US5281284 discloses a kind of method with thin strap continuous casting explained hereafter 18-8 type Stainless Steel Band, the composition of its alloy is a 18-8 type stainless steel, and wherein at least two kinds of summations or a kind of composition reach 0.01-1% among alloy element Al, Ti, Nb, Zr, La, Ca, the Nd; Or at least two kinds of summations of alloying element Mg, Ca, B or a kind of composition in the composition reach 0.001-1%.Its production technique is: less than the thick Cast Strip of 10mm, solidify under 100 ℃/s speed of cooling the Cast Strip with the cast of thin strap continuous casting technology, and keep 5sec-2min at 900-1250 ℃, is cooled to 600 ℃-900 ℃ with 10 ℃/s speed then, and batches at≤600 ℃.The Cast Strip that produces twists under the temperature that is higher than 850 ℃ anneals, and annealing guarantees austenite crystal 50um, carries out pickling and cold-rolling then.
U.S. Patent Publication No. US5284535 discloses a kind of production method of 304 austenic stainless steel belts.This invention is the method cast austenitic stainless steel with twin-roll thin strip continuous casting, then the Cast Strip is cooled to the austenite one phase district; Anneal in austenite and ferritic two-phase region or ferritic single phase region and to be cooled to the austenite one phase district then and to carry out cold rolling.Annealing temperature is at 1200-1400 ℃, and said process carries out 2 times at least, and this circulation heating can the refinement precipitate, improves performance.
U.S. Patent Publication No. US6099665 discloses the stainless method of a kind of thin strap continuous casting Cr-Ni, thin strap continuous casting is less than the 10mm Cast Strip, and the Cast Strip is online carries out hot rolling at 1000～1150 ℃, and the hot rolled draft is 10～50%, and keep 5sec at 1050～1150 ℃, guarantee abundant recrystallize; To batch to 600 ℃ of degree and at 600 ℃ from 900 ℃ less than speed then with 20 ℃/s.
Chinese patent application numbers 200610116419.9 discloses a kind of thin belt continuous casting austenitic stainless steel belt and manufacture method thereof, adopts to add a spot of Sn and reach and reduce ferritic purpose in the steel, carries out solution treatment simultaneously before cold rolling.
Summary of the invention
The objective of the invention is by a kind of austenic stainless steel belt and manufacture method thereof are provided, by adding a certain amount of copper, reduce the consumption of nickel, and [Cr] in the steel/[Ni] reduced, the delta ferrite level in the as cast condition reduces greatly, can improve the corrosion resistance nature of steel, in the technology without hot rolling and solution treatment operation, reduce production costs, make the production process simple and stable, be easy to control.
The present invention realizes that the technical scheme of above-mentioned purpose is: a kind of austenic stainless steel belt, the chemical element that comprises following weight percent proportioning: C:0.04～0.12%, Si:0.4～1%, Mn:0.8～2%, P≤0.04%, S≤0.03%, Cr:17～19%, Ni:7～10%, Cu:0.25～0.5%, surplus is Fe and inevitable impurity.
The Cu element is considered to the harmful element in the steel usually, is no more than 0.25% when Cu exists as residual element in the steel.Because add excessive Cu in the steel, segregation easily takes place, in routine castingprocesses at a slow speed, the Cu element can be owing to be segregated near a large amount of enrichments crystal boundary, the generation of defective such as crackle when causing hot-work easily.And utilization thin strap continuous casting technology, because its setting rate is very fast, can significantly suppress easy segregation element, therefore under the such processing condition of thin strap continuous casting in interdendritic segregation, in the austenitic stainless steel conventional ingredient, add Cu, can not cause near the segregation phenomena of Cu crystal boundary.
Simultaneously, Cu is the typical element that enlarges the austenite phase region, adds a certain amount of copper, can make in the Fe-C phasor A
4Point raises, A
1And A
3Point reduces, and this and the expensive effect of strategic element Ni in stainless steel are equal to, and in this sense, Cu and Ni facilitate austenitic alloying element, and to a certain extent, Cu can partly substitute Ni.Among the present invention, add a certain amount of Cu, can make that the content of Ni drops to lower limit in the austenitic stainless steel, even can be lower than the lower limit requirement slightly, effectively saved the Ni resource; Can also realize effective utilization of copper in steel scrap or the ore resources inferior (high copper mine), reduce production costs, reach the Sustainable development purpose.
In addition, because it is delta ferrite to have occurred in the monophasic austenitic stainless steel originally that this nonequilibrium freezing of thin strap continuous casting makes, and discover, the content of delta ferrite is relevant with the normal ratio of Cr, Ni ([Cr]/[Ni]) in the stainless steel original composition, and [Cr]/[Ni] is more little, and delta ferrite level is low more, and the adding of Cu, increase the equivalent ([Ni]) of Ni, [Cr] in the steel/[Ni] reduced, thereby reached the purpose that reduces delta ferrite.In the actual tests, add a certain amount of Cu in the austenitic stainless steel original composition, [Cr] in the steel/[Ni] reduced, the delta ferrite level in the as cast condition reduces greatly; The reduction of delta ferrite level can improve the corrosion resistance nature of steel.Document " The effect of copper onheat transfer behavior during droplet solidification " (Proceedings ofthe Second Baosteel Biennial Academic conference, 2006) point out in the research, in steel, add a certain amount of Cu (being not more than 0.5%), under the such processing condition of thin strap continuous casting, influence to heat flow density is not remarkable, promptly can not influence the original process of setting of molten steel.
Copper is the face-centered cubic lattice structure, and joining is in the austenitic steel of face-centered cubic lattice structure the time equally, and the Cu atom is solid-solubilized among γ-Fe, lattice distortion can not occur, and the face-centered cubic lattice structure of γ-Fe is more stable with making.Therefore, in austenitic stainless steel, add a certain amount of Cu, can not cause the deterioration of surface quality (such as crackle) because of the intragranular portion that the do not coexist generation distortional strain energy of lattice lattice structure.
A kind of manufacture method of austenic stainless steel belt may further comprise the steps:
1) smelts C:0.04～0.12%, Si:0.4～1%, Mn:0.8～2% according to following weight percent proportioning, P≤0.04%, S≤0.03%, Cr:17～19%, Ni:7～10%, Cu:0.25～0.5%, surplus is Fe and inevitable impurity, and the molten steel that will meet composition becomes the Cast Strip through twin-roll thin strip continuous casting, controlled chilling, batches, speed of cooling is 20～40 ℃/s, coiling temperature≤600 ℃.
2) pickling, cold rolling, cold rolling draft≤15%; Less draft first is in order to guarantee that rolling crack and less resistance to deformation do not appear in the Cast Strip after the pickling under the direct cold rolling state.
3) annealing, annealing temperature is 1050～1150 ℃, the time is 3～7min, pickling and cold rolling again after the annealing, cold rolling draft 〉=40%; Band steel after cold rolling carries out high temperature annealing, help softening with steel, band steel pickling and cold rolling again after softening relatively, can make full and uniformization of band steel interior tissue greater than 40% rolling reduction, further, the homogenizing of interior tissue, composition make in the steel [Cr]/[Ni] also obtained homogenizing, and the content of delta ferrite has direct relation with [Cr]/[Ni]; On the other hand, owing between every time cold rolling process, all have a high-temperature annealing process, 1050～1150 ℃ temperature can make delta ferrite to the austenitic phase transformation of γ.More than the reason of two aspects make that the amount of delta ferrite further reduces again in the final austenitic stainless steel.Simultaneously, basic variation has also taken place in the pattern of delta ferrite.
4) annealing once more, annealing temperature is 1050～1150 ℃, and annealing time is 3～7min, and pickling once more, smooth, rip cutting become the finished product volume.
It is thinner that if finished product thickness requires, but repeating step 3)～4 one or many).
Preferably, in the described step 1), the thickness of Cast Strip is 1～5mm.
Preferably, in the described step 1), the coiling temperature of Cast Strip≤600 ℃.
The Cast Strip of thin strap continuous casting explained hereafter is compared with conventional continuous casting, and what setting rate will be fast is many, and this maximum problem for producing 18-8 type austenitic stainless steel is that the residual ferrite of high temperature is arranged in austenite inevitably.Why non-corrosive is exactly that if in the austenitic single phase structure ferritic phase has been arranged, stainless erosion resistance reduces greatly because be single phase structure to austenitic stainless steel.After having added Cu in the composition, ferritic amount significantly reduces, but can not eliminate at all.Also must further eliminate ferrite, improve the intergranular corrosion resistance and the over-all properties of steel simultaneously by follow-up thermal treatment process.Therefore, the present invention adopts above-mentioned direct cold rolling to cooperate the high temperature annealing thermal treatment process further to reduce ferrite content, reaches the erosion resistance of raising Stainless Steel Band and the purpose of comprehensive mechanical performance.
The present invention compared with prior art has following beneficial effect:
(1) the present invention has added Cu in composition, has effectively saved the consumption of Ni element, has reduced production cost, and simultaneously, the interpolation of Cu element reduces [Cr] in the steel/[Ni], has promptly reduced ferrite content in the steel, has improved the erosion resistance of steel.
(2) the present invention adopts direct cold rolling to cooperate the high temperature annealing operation, save hot rolling and solution treatment operation, reached the effect that can reach equally with hot rolling or solution treatment operation, and owing to saved hot rolling and solution treatment operation, greatly reduce the cost of investment and the running cost of equipment, make the production process simple and stable, be easy to control.
(3) with respect to the annealing temperature of prior art greater than 850 ℃, annealing temperature of the present invention will be higher than 1000 ℃; The present invention increases process annealing at cold rolling in addition, and purpose is softening steel band, and cold rolling of strip steel is arrived thinner specification; And cold rolling back increases annealing operation, improved material plasticity, reduced ferrite content.
Description of drawings
Fig. 1 is the thin strap continuous casting unit process flow diagram that the present invention relates to.
Fig. 2 be in the content of delta ferrite in the strip casting process and the austenitic stainless steel original composition [Cr]/[Ni] concern synoptic diagram.
Fig. 3 is not for adding the influence synoptic diagram of Cu element to the Cast Strip ferrite content.
Fig. 4 is for adding the influence synoptic diagram of Cu element to the Cast Strip ferrite content.
Fig. 5 is a process route view of the present invention.
Fig. 6 is the delta ferrite pattern synoptic diagram of strip after direct cold rolling and annealing.
Fig. 7 contains Cu stainless steel strip delta ferrite statistics synoptic diagram quantitatively before direct cold rolling and annealing process.
Fig. 8 contains Cu stainless steel strip delta ferrite statistics synoptic diagram quantitatively behind direct cold rolling and annealing process.
Fig. 9 is the statistics synoptic diagram that contains Cu stainless steel strip delta ferrite percentage composition before direct cold rolling and annealing process.
Figure 10 is the statistics synoptic diagram that contains Cu stainless steel strip delta ferrite percentage composition behind direct cold rolling and annealing process.
Figure 11 is the electrolytic corrosion photo of stainless steel strip before direct cold rolling and annealing process.
Figure 12 is the electrolytic corrosion photo of stainless steel strip behind direct cold rolling and annealing process.
Figure 13 is the X-ray diffraction result schematic diagram of thin strap continuous casting cupric austenitic stainless steel strip after direct cold rolling and annealing.
Embodiment
The embodiment of the invention adopts the thin strap continuous casting technical process of Fig. 1, adds a certain amount of Cu in austenitic stainless steel, produces the cupric austenic stainless steel belt that a kind of performance is not less than common process.Fig. 5 is a process route view of the present invention.
As shown in Figure 2, the content of delta ferrite is relevant with the normal ratio of Cr, Ni ([Cr]/[Ni]) in the stainless steel original composition, [Cr]/[Ni] is more little, delta ferrite level is low more, and the adding of Cu, increase the equivalent ([Ni]) of Ni, [Cr] in the steel/[Ni] reduced, thereby reached the purpose that reduces delta ferrite.
As shown in Figure 3 and Figure 4, add a certain amount of Cu in the austenitic stainless steel original composition, [Cr] in the steel/[Ni] reduced, the delta ferrite level in the as cast condition reduces greatly, thereby can improve the corrosion resistance nature of steel.
Fig. 6 is the delta ferrite pattern of strip after technology of the present invention, as can be seen from Figure 6, after direct cold rolling and annealing process, the pattern of delta ferrite becomes spot distribution by the vermiform distribution of as cast condition situation, and quantity also significantly reduces, and the variation of this pattern and quantity can be so that the finished product corrosion resistance nature improves greatly.
Fig. 7, Fig. 8 contain Cu austenitic stainless steel strip delta ferrite statistics synoptic diagram quantitatively before direct cold rolling and annealing process and afterwards.Wherein, Fig. 7 is the delta ferrite number of strip before direct cold rolling and annealing process, and Fig. 8 is the delta ferrite number of strip behind direct cold rolling and annealing process.
Fig. 9 and Figure 10 contain the Cu austenitic stainless steel strip statistics synoptic diagram of delta ferrite on percentage composition before direct cold rolling and annealing process and afterwards.Wherein, Fig. 9 is the delta ferrite percentage composition of strip before direct cold rolling and annealing process, and Figure 10 is the delta ferrite percentage composition of strip behind direct cold rolling and annealing process.
As can be seen, before process technology of the present invention, the number of the delta ferrite of Cast Strip in average each visual field is about 400 from Fig. 7, Fig. 8, Fig. 9 and Figure 10, and the content of delta ferrite is about 8%; And after technology of the present invention, the number of delta ferrite in average each visual field drops to about 100, and the content of delta ferrite has also dropped to about 0.25%.
Figure 11 and Figure 12 are that stainless steel strip is before direct cold rolling and annealing process and electrolytic corrosion photo afterwards.As can be seen, the Cast Strip is after electrolytic corrosion from Figure 11 and Figure 12, and crystal boundary has the obvious corrosion ditch, and the crystal grain ditch that is corroded surrounds, and the intergranular corrosion resistance performance is bad, as Figure 11; And the strip after technology of the present invention, after the electrolytic corrosion, crystal boundary is very clean, ditch shape structure do not occur at the crystal boundary place, as Figure 12, illustrates that stainless steel strip after cold rolling, has good anti-grain boundary corrosion performance.In the operation of rolling, can produce a certain amount of deformation induced martensite simultaneously.
Figure 13 is the X-ray diffraction result schematic diagram of thin strap continuous casting cupric austenitic stainless steel strip after direct cold rolling and annealing, do not detect the delta ferrite phase in the drawings, be because delta ferrite level is lower, XRD can't detect, and the martensite of deformation induced generation has also hindered being corroded of austenitic matrix to a certain extent.
1) molten steel chemical ingredients (wt%): C=0.08%, Si=0.4%, Mn=2%, P=0.021%, S=0.006%, Cr=19%, Ni=7%, Cu=0.5%, surplus is Fe and inevitable impurity;
2) press mentioned component and smelt, form 2.3mm Cast Strip, controlled chilling, the Cast Strip is batched at 590 ℃ through twin-roll thin strip continuous casting;
3) carry out pickling then, carry out cold rolling, for the first time cold rolling draft 14% again, the band steel after cold rolling is annealed in bell type annealing furnace, annealing temperature is 1080 ℃, and annealing time is 7min;
4) pickling and cold rolling again, for the second time cold rolling draft 45% is annealed the band steel after cold rolling in bell type annealing furnace, and annealing temperature is 1100 ℃, and annealing time is 3.5min;
5) pickling and cold rolling again, cold roling reduction is 45% for the third time, reaches target finished product thickness 0.6mm, and the band steel that will reach the target finished product thickness is annealed in bell type annealing furnace once more, and annealing temperature is 1050 ℃, and annealing time is 3min;
6) pickling is smooth, rip cutting finished product volume.
Embodiment 2
Embodiment 2 in turn includes the following steps:
1) molten steel chemical ingredients (wt%): C=0.12%, Si=0.85%, Mn=0.8%, P=0.035%, S=0.03%, Cr=17%, Ni=9.3%, Cu=0.3%, surplus is Fe and inevitable impurity;
2) press mentioned component and smelt, form 2.0mm Cast Strip, controlled chilling, the Cast Strip is batched at 600 ℃ through twin-roll thin strip continuous casting;
3) carry out pickling then, carry out cold rolling, for the first time cold rolling draft 15% again, the band steel after cold rolling is annealed in bell type annealing furnace, annealing temperature is 1050 ℃, and annealing time is 6min;
4) pickling and cold rolling again, for the second time cold rolling draft 45% is annealed the band steel after cold rolling in bell type annealing furnace, and annealing temperature is 1150 ℃, and annealing time is 4min;
5) pickling and cold rolling again, cold roling reduction is 43% for the third time, reaches target finished product thickness 0.4mm, and the band steel that will reach the target finished product thickness is annealed in bell type annealing furnace once more, and annealing temperature is 1060 ℃, and annealing time is 3min;
6) pickling is smooth, rip cutting finished product volume.
Embodiment 3
Embodiment 3 in turn includes the following steps:
1) molten steel chemical ingredients (wt%): C=0.04%, Si=1%, Mn=1.56%, P=0.04%, S=0.01%, Cr=17.4%, Ni=10%, Cu=0.25%, surplus is Fe and inevitable impurity;
2) press mentioned component and smelt, form 2.5mm Cast Strip, controlled chilling, the Cast Strip is batched at 600 ℃ through twin-roll thin strip continuous casting;
3) carry out pickling then, carry out cold rolling, for the first time cold rolling draft 15% again, the band steel after cold rolling is annealed in bell type annealing furnace, annealing temperature is 1120 ℃, and annealing time is 4min;
4) pickling and cold rolling again, for the second time cold rolling draft 40% is annealed the band steel after cold rolling in bell type annealing furnace, and annealing temperature is 1070 ℃, and annealing time is 7min;
5) pickling and cold rolling again, cold roling reduction is 45% for the third time, reaches target finished product thickness 0.7mm, and the band steel that will reach the target finished product thickness is annealed in bell type annealing furnace once more, and annealing temperature is 1050 ℃, and annealing time is 5min;
6) pickling is smooth, rip cutting finished product volume.
Comparative Examples 1
Comparative Examples 1 in turn includes the following steps:
1) molten steel chemical ingredients (wt%): C=0.11%, Si=0.85%, Mn=1.56%, P=0.035%, S=0.010%, Cr=17.6%, Ni=9.6%, surplus is Fe and inevitable impurity;
2) press mentioned component and smelt, form 2.0mm Cast Strip, controlled chilling, the Cast Strip is batched at 600 ℃ through twin-roll thin strip continuous casting;
3) carry out pickling then, carry out cold rolling, for the first time cold rolling draft 15% again, the band steel after cold rolling is annealed in bell type annealing furnace, annealing temperature is 1050 ℃, and annealing time is 6min;
4) pickling and cold rolling again, for the second time cold rolling draft 45% is annealed the band steel after cold rolling in bell type annealing furnace, and annealing temperature is 1100 ℃, and annealing time is 4min;
5) pickling and cold rolling again, cold roling reduction is 43% for the third time, reaches target finished product thickness 0.4mm, and the band steel that will reach the target finished product thickness is annealed in bell type annealing furnace once more, and annealing temperature is 1060 ℃, and annealing time is 3min;
6) pickling is smooth, rip cutting finished product volume.
Following table 1, table 2, table 3 are respectively the synopsis of embodiment and Comparative Examples, and wherein chemical element composition per distribution ratio sees Table 1, and the processing parameter contrast sees Table 2, and the implementation result of mechanical property and remaining ferrite content sees Table 3.
Table 1
| Embodiment | Composition (wt%) | ||||||||
| C | Si | Mn | P | S | Cr | Ni | | Surplus | |
| Embodiment | |||||||||
| 1 | 0.08 | 0.4 | 2 | 0.021 | 0.006 | 19 | 7 | 0.5 | Fe and other inevitable impurity |
| Embodiment 2 | 0.12 | 0.85 | 0.8 | 0.035 | 0.03 | 17 | 9.3 | 0.3 | Fe and other inevitable impurity |
| Embodiment 3 | 0.04 | 1 | 1.56 | 0.04 | 0.01 | 17.4 | 10 | 0.25 | Fe and other inevitable impurity |
| Comparative Examples (traditional technology) | 0.04～ 0.12 | 0.4～1 | 0.8～2 | ≤0.04 | ≤0.03 | 17～19 | 8～11 | - | Fe and other inevitable impurity |
| Comparative Examples 1 (no Cu) | 0.11 | 0.85 | 1.56 | 0.035 | 0.01 | 17.6 | 9.6 | - | Fe and other inevitable impurity |
Table 2
| Embodiment | Processing parameter | |||||
| Cold rolling 1 | Annealing schedule | Cold rolling 2 | Annealing schedule | Cold rolling 3 | | |
| Embodiment | ||||||
| 1 | 14％ | 1080℃× 7min | 45％ | 1100℃× 3.5min | 45％ | 1050℃× 3min |
| Embodiment 2 | 15％ | 1050℃× 6min | 45％ | 1150℃× 4min | 43％ | 1060℃× 3min |
| Embodiment 3 | 15％ | 1120℃× |
40％ | 1070℃× 7min | 45％ | 1050℃× 5min |
| Comparative Examples (traditional technology) | - | - | - | - | - | - |
| Comparative Examples 1 (no Cu) | 15％ | 1050℃× 6min | 45％ | 1100℃× 4min | 43％ | 1060℃× 3min |
Table 3
| Embodiment | Implementation result | |||
| σs(MPa) | σ m(MPa) | δ(％) | Ferrite | |
| Embodiment | ||||
| 1 | 245 | 661 | 55 | 0.18 |
| Embodiment 2 | 283 | 690 | 52 | 0.25 |
| Embodiment 3 | 278 | 670 | 54 | 0.23 |
| Comparative Examples (traditional technology) | 240～350 | 590～690 | 50～60 | ＜0.3 |
| Comparative Examples 1 (no Cu) | 275 | 685 | 53 | 0.52 |
In the present invention, the ferrite average content of cold rolling back austenic stainless steel belt is less than 0.3%, and the Cast Strip of using thin strap continuous casting adopts direct cold rolling to cooperate high temperature annealing operation, the σ of finished product without hot rolling and solution treatment operation
sCan be greater than 240Mpa, σ
mCan be greater than 630Mpa, stainless unit elongation is greater than 50%.
Claims (3)
1. the manufacture method of an austenic stainless steel belt is characterized in that may further comprise the steps:
1) smelt according to following weight percent proportioning, C:0.04～0.12%, Si:0.4～1%, Mn:
0.8～2％，P≤0.04％，S≤0.03％，Cr：17～19％，Ni：7～10％，Cu：
0.25～0.5%, surplus is Fe and inevitable impurity, the molten steel that will meet composition becomes the Cast Strip through twin-roll thin strip continuous casting, controlled chilling, batches, and speed of cooling is 20～40 ℃/s, coiling temperature≤600 ℃;
2) pickling, cold rolling, cold rolling draft≤15%;
3) annealing, annealing temperature is 1050～1150 ℃, the time is 3～7min, pickling and cold rolling again after the annealing, cold rolling draft 〉=40%;
4) annealing once more, annealing temperature is 1050～1150 ℃, and annealing time is 3～7min, and pickling once more, smooth, rip cutting become the finished product volume.
2. the manufacture method of austenic stainless steel belt as claimed in claim 1 is characterized in that, in the described step 1), the thickness of Cast Strip is 1～5mm.
3. the manufacture method of austenic stainless steel belt as claimed in claim 1 is characterized in that, if the thickness requirement of finished product is thinner, then repeating step 3) and 4) one or many.
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