CN101230413B - Heat processing technique for austenitic stainless steel hot-rolling coil with high carbon content - Google Patents
Heat processing technique for austenitic stainless steel hot-rolling coil with high carbon content Download PDFInfo
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- CN101230413B CN101230413B CN2007100368634A CN200710036863A CN101230413B CN 101230413 B CN101230413 B CN 101230413B CN 2007100368634 A CN2007100368634 A CN 2007100368634A CN 200710036863 A CN200710036863 A CN 200710036863A CN 101230413 B CN101230413 B CN 101230413B
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Abstract
The invention relates to a method of producing austenitic stainless steel hot-rolled plates, and the carbon content of which is relatively high. A processing technology of austenitic stainless steel hot-rolled plate is characterized in that the temperature of a plate blank can be controlled above 1270 DEG C; the final rolling temperature of the hot-rolled plate is ranged from 1050 DEG C to 1150 DEG C; and the U-type cooling manner which is high at two ends and low in the middle is adopted; and the rolling temperature is ranged from 620 DEG C to 680 DEG C. On the aspects of the uniformity of crystal grains and the full solid solution of carbide, the hot-rolled plate produced according to the heat rolling processing technology of the invention can roughly reach the effect of the off-line solid solution treatment before the cool rolling process; therefore, the hot-rolled plate treated according to the heat rolling processing technology does not need the solid solution treatment before the cool rolling process. The heat rolling processing technology of the invention not only can save energy, but also can reduce the cost of cool rolled products, thereby having good developing prospects.
Description
(1) technical field
The present invention relates to the method for manufacture of the higher austenitic stainless steel hot-rolled coil of a kind of carbon content.
(2) background technology
Because the requirement of product wear resistance, austenitic stainless steel SUS301 carbon content is higher; And in order in the cold working process, to obtain martensite, do not contain stabilizing element Ti, Nb etc. among the SUS301, so in the hot procedure of common this kind austenitic stainless steel, the many forms with chromium-ferrous-carbide of carbon that are not dissolved in the austenite (mainly are M
23C
6) separate out, also have a spot of with M
7C
3Or M
3The form of C is separated out.Carbide produces poor chromium phenomenon around the crystal boundary after crystal boundary is separated out, in case the content of chromium is less than its corrosion resistant lowest limit 11.5% around the crystal boundary, the anti-corrosion capability of metal descends, and this stainless steel will produce the phenomenon of intergranular corrosion.Therefore, the SUS301 stainless steel must make the carbide of separating out be dissolved in mother metal and make carbide no longer form through quenching technology through solution annealing technology before cold rolling.Except preventing to form the chromium carbide, solution annealing technology is also improved the stainless cold-forming property of SUS301 through even austenite crystal.
Chinese patent CN1625447A has announced a kind of method of manufacture and equipment of austenitic stainless steel hot rolled band; This method of manufacture is in course of hot rolling, the finishing temperature of rolled piece to be adjusted to the temperature that is higher than 1000 ℃ and preferably is higher than 1050 ℃; Subsequently, rolled piece was quenched into the temperature that is lower than 600 ℃ and preferably is lower than 450 ℃ in 20 seconds.This method of manufacture is the supporting patent applicant producing apparatus that belongs to the austenitic stainless steel hot rolled band that SMS De Marger GmbH proposes, and the special character of this equipment is that it comprises a curved formula continuous caster of arc of producing thin continuously cast bloom; After descaling device, it is provided with an induction type and forces hot mechanism, makes finishing temperature be enough to adjust through this mechanism and is higher than 1000 ℃ desirable finishing temperature; It is 400 ℃～650 ℃ hot rolled band that the ability of its reeling machine also enough can be rolled temperature.
Chinese patent CN1788870A has announced a kind of " on-line heat treatment method for hot rolling stainless steel band for cold rolling ", and this method adopts following online heat treating method to SUS304: slab heating temperature is 1200 ℃～1300 ℃; Roughing speed 2～5m/s, 1030 ℃～1120 ℃ of finishing temperatures; During finish rolling, temperature in is at 1020 ℃～1100 ℃, continuous mill roll speed 8～14m/s, and total deformation is greater than 70%, and rolling temperature out reaches more than 1000 ℃; The laminar flow type of cooling is adopted in cooling; Coiling temperature is 350 ℃～600 ℃.What the online heat treating method of this kind was directed against is the SUS304 austenitic stainless steel, and for the higher SUS301 austenitic stainless steel of carbon content, if do not adopt the special type of cooling, the coiling temperature that is lower than 700 ℃ is to produce a series of problems.
Japanese Patent JP60255921A has announced a kind of " hot rolling austenite stainless steel plate band method of manufacture ", finishing temperature>=850 that this method adopts ℃, and purpose is for the solid solution carbide; Cooling rapidly after the hot rolling, speed of cooling>=10 ℃/s; Coiling temperature≤500 ℃.Can under the prerequisite of omitting off-line solution treatment process, produce high-quality austenite stainless steel plate band through this heat processing technique with low cost.Though this kind method of manufacture coiling temperature is lower, finishing temperature is lower, and speed of cooling is slower, like this its carbide separate out situation will be more than the hot-rolled coil that the present invention obtains, and mechanical property does not have bigger change.
(3) summary of the invention
The object of the present invention is to provide the heat processing technique of the higher austenitic stainless steel hot-rolled coil of a kind of carbon content; Through this heat processing technique as much as possible in hot procedure even grained with avoid since carbide separate out the intergranular corrosion phenomenon that takes place; Make it before cold rolling, can not carry out solution treatment for a long time and even need not carry out solution treatment; Thereby the saving energy, the manufacturing cost of reduction cold-rolled products.
The present invention is achieved in that the heat processing technique of the austenitic stainless steel hot-rolled coil that a kind of carbon content is higher; It is characterized in that: board briquette is controlled at more than 1270 ℃; The finishing temperature interval of hot-rolled sheet is 1050 ℃～1150 ℃; Adopt two head heights, middle low " U " type laminar flow refrigerative type of cooling, the coiling temperature interval is 620 ℃～680 ℃.
Said " U " type laminar flow Cooling Control model is that each 15m of end end to end of hot-rolled sheet is not cold or few cold, and temperature is 800 ± 30 ℃, and middle portion adopts strong cold mode, and temperature is positioned at the coiling temperature interval.It is above until coiling temperature that the speed of cooling of hot-rolled sheet remains on 30 ℃/s after the finish to gauge.The coiling temperature interval is 620 ℃～650 ℃.
The present invention is owing to adopted above-mentioned technical scheme; Make it compared with prior art; Have following advantage and positively effect: make the higher SUS301 austenitic stainless steel of carbon content in hot procedure as much as possible evenly austenite crystal with avoid separating out of carbide; And its mechanical property do not have big change, and cold-rolled process and the finished product performance are not had big influence.Adopt the SUS301 austenitic stainless steel of heat processing technique manufacturing of the present invention before cold-rolled process, can not carry out solution treatment for a long time; Even need not carry out solution treatment for the SUS301 steel of some purposes; So just can save the energy widely, reduce the manufacturing cost of cold-rolled products.
(4) description of drawings
Fig. 1 is the scanning electricity border figure (embodiment 1) of gained SUS301 steel behind the employing heat processing technique of the present invention;
Fig. 2 is the scanning electricity border figure (embodiment 1) of gained SUS301 steel behind the existing heat processing technique of employing;
Fig. 3 is the metallographic structure figure (embodiment 2) of gained SUS301 steel behind the employing heat processing technique of the present invention;
Fig. 4 is the metallographic structure figure (embodiment 2) of gained SUS301 steel behind the existing heat processing technique of employing;
The moving polarization curve (embodiment 2) that Fig. 5 does for the material that employing technology of the present invention and existing technology obtain.
Among Fig. 5: thick lines are for adopting the moving polarization curve of technology gained hot-rolled sheet of the present invention, and hachure is for adopting the moving polarization curve of former technology gained hot-rolled sheet.
(5) embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described further.
The heat processing technique of the austenitic stainless steel hot-rolled coil that a kind of carbon content is higher; Be that board briquette is controlled at more than 1270 ℃; To guarantee under existing roll speed; The finishing temperature interval of hot-rolled sheet is 1050 ℃～1150 ℃, and this temperature range can guarantee that the higher austenitic stainless steel of carbon content avoids carbide precipitate in the short period of time.
The type of cooling adopts the cooling of " U " type laminar flow, and concrete method is: 15 meters on hot-rolled sheet head is few cold or not cold, and coiling temperature is 800 ± 30 ℃ like temperature about 800 ℃, to guarantee the volume type; 15 meters of hot-rolled sheet afterbodys are few cold or not cold, and coiling temperature is 800 ± 30 ℃ like temperature about 800 ℃, to guarantee not loose winding.According to production rate, the temperature of portion end to end of hot-rolled sheet can not be higher than 830 ℃ basically.On the other hand, if the head temperature of hot-rolled sheet is lower than 770 ℃, the volume type in the time of will influencing it and batch causes tower; And if the afterbody temperature is lower than 770 ℃, with the loose winding that causes coils of hot-rolled steel.Hot-rolled sheet removes part end to end, and rest part adopts the interval temperature of coiling temperature to batch.
The coiling temperature interval is 620 ℃～680 ℃, is preferably lower than 650 ℃, can cause the phenomenon of separating out of carbide to avoid the slow cooling of hot-rolled coil after batching.
It is above until coiling temperature that the hot-rolled sheet speed of cooling remains on 30 ℃/s after the finish to gauge.
It all is to avoid TTP curve (be time-temperature-separate out figure, or the carbide that is referred to as chromium beginning to separate out curve) for the process of cooling that makes coils of hot-rolled steel in theory that low temperature batches with quick cooling purpose.
Embodiment 1
Carry out the heat processing technique test of SUS301 austenitic stainless steel in the laboratory, the concrete composition of this steel grade (weight percent, all the other are Fe and unavoidable impurities) is as shown in table 1.
Table 1
| Steel grade | C | Si | Mn | P | S | Cr | Ni | N |
| SUS301 | 0.11 | 0.67 | 0.74 | 0.027 | 0.003 | 16.60 | 6.81 | 0.038 |
The SUS301 plate slab of 200mm is through after forging and the hot rolling technology; Final finished thickness is 3mm; Adopt heat processing technique of the present invention to make the SUS301 austenitic stainless steel, process is following: 1270 ℃ of board briquettes, 1050 ℃ of finishing temperatures; 32 ℃/s of speed of cooling, hot-rolled sheet batches with simulation at 650 ℃ of insulations of coiling temperature 30min the most at last.Hot-rolled sheet adopts " U " type laminar flow type of cooling after being similar to finish to gauge, and the coiling temperature of wrench tail 15m is 800 ℃, 32 ℃/s of speed of cooling, and hot-rolled sheet middle portion coiling temperature is 650 ℃.
And adopt former heat processing technique to make the SUS301 steel, and process is following: 1250 ℃ of board briquettes, finishing temperature are 980 ℃, and speed of cooling is 20 ℃/s, and hot-rolled sheet insulation 30min when 750 ℃ of coiling temperatures batches with simulation the most at last.
Relatively adopt the hot-rolled sheet (numbering 301-1 in the literary composition) of heat processing technique gained of the present invention and the performance of former heat processing technique gained hot-rolled sheet (numbering 301-2 in the literary composition) each side.The tensile property of two kinds of heat processing technique gained SUS301 steel is as shown in table 2.
Table 2
Can find out that by table 2 surrender of the SUS301 steel of two kinds of heat processing technique gained is more or less the same with tensile strength, adopt modified version heat processing technique gained the SUS301 steel ys slightly greatly and tensile strength is slightly little, in addition, its unit elongation obviously improves.
Aspect microanalysis, can find out obviously that by Fig. 1 and Fig. 2 adopt around the SUS301 hot-rolled sheet austenite grain boundary of heat processing technique of the present invention carbide precipitate hardly, the amount of separating out of carbide will be lacked more than the amount of separating out that adopts former technology gained hot-rolled sheet.In addition, the explanation that needs be, can find out from Fig. 1 and Fig. 2, adopt the homogeneity of SUS301 hot-rolled sheet crystal grain of heat processing technique of the present invention suitable with the former technology gained hot-rolled sheet of employing, can not influence its mechanics and corrosive nature.
Table 3 is depicted as the intergranular corrosion rate of two kinds of heat processing technique gained SUS301 steel.
Table 3
Can find out that by table 3 the modified version heat processing technique is that the intergranular corrosion tendency of SUS301 hot-rolled sheet is reduced greatly.And the principal element of decision austenite stainless steel hot-rolled sheet intergranular corrosion tendency has the amount of separating out of carbide and the homogeneity of crystal grain, explain that the modified version heat processing technique can guarantee the amount of separating out and crystal grain inhomogeneity of its carbide in the production process of SUS301 hot-rolled sheet.
Embodiment 2
The heat processing technique that the SUS301 austenitic stainless steel adopts is following: 1270 ℃ of board briquettes; 1050 ℃ of finishing temperatures; Hot-rolled sheet adopts " U " type laminar flow type of cooling after the finish to gauge, and the coiling temperature of wrench tail 15m is 780 ℃, and the middle portion coiling temperature is 620 ℃, 39 ℃/s of speed of cooling.
Relatively adopt the hot-rolled sheet (numbering 301-3 in the literary composition) and former heat processing technique gained hot-rolled sheet (numbering 301-2 in the literary composition) various aspects of performance of heat processing technique gained of the present invention.The tensile property of two kinds of heat processing technique gained SUS301 steel is as shown in table 4.
Table 4
Aspect microtexture, by finding out among Fig. 3 and Fig. 4, the homogeneity of SUS301 hot-rolled sheet crystal grain that adopts heat processing technique of the present invention is with to adopt former technology gained hot-rolled sheet suitable.
Aspect corrosion,, as shown in Figure 5 with being numbered 301-2 and the 301-3 hot-rolled sheet has carried out the test of moving polarization curve.As can beappreciated from fig. 5, the corrosion potential of 301-3 (dissolution potential of austenitic stainless steel self matrix) and disruptive potential (austenitic stainless steel self passive film destroys necessary potential) are all high than 301-2, explain that its solidity to corrosion also is better than 301-2.
Embodiment 3
The heat processing technique that the SUS301 austenitic stainless steel adopts is following: 1270 ℃ of board briquettes; 1100 ℃ of finishing temperatures; Hot-rolled sheet adopts " U " type laminar flow type of cooling after the finish to gauge, and the coiling temperature of wrench tail 15m is 800 ℃, and the middle portion coiling temperature is 650 ℃, 41 ℃/s of speed of cooling.The technology of this embodiment is similar to embodiment 1, but because its speed of cooling is faster much than the speed of cooling of embodiment 1, so adopt the carbide amount of separating out of this embodiment gained hot-rolled sheet will be less than the carbide amount of separating out of embodiment 1 gained hot-rolled sheet.
Embodiment 4
The heat processing technique that the SUS301 austenitic stainless steel adopts is following: 1270 ℃ of board briquettes; 1050 ℃ of finishing temperatures; Hot-rolled sheet adopts " U " type laminar flow type of cooling after the finish to gauge, and the coiling temperature of wrench tail 15m is 820 ℃, and the middle portion coiling temperature is 680 ℃, 34 ℃/s of speed of cooling.This embodiment gained SUS301 austenite stainless steel hot-rolled sheet carbide amount of separating out is more than the carbide amount of separating out of first three items embodiment gained hot-rolled sheet; But still be less than the carbide amount that adopts former heat processing technique gained hot-rolled sheet to separate out greatly; Reason is that its coiling temperature is high slightly, and speed of cooling is slow slightly.
Before adopting hot-rolled coil that heat processing technique of the present invention obtains aspect the complete solid solution of the homogeneity of crystal grain and carbide, can reach cold-rolled process basically carry out the effect of off-line solution treatment; Therefore; Before cold rolling, the hot-rolled coil of process heat processing technique of the present invention just can not carry out solution treatment for a long time.In the process of the SUS301 product of developing some purposes, even need not carry out solution treatment to it.Because heat processing technique of the present invention not only can be saved the energy, and can reduce the manufacturing cost of cold-rolled products, it has bright development prospect.
Claims (2)
1. the heat processing technique of the higher austenitic stainless steel hot-rolled coil of a carbon content; It is characterized in that: board briquette is controlled at more than 1270 ℃; The finishing temperature interval of hot-rolled sheet is 1050 ℃～1150 ℃; Adopt two head heights, middle low " U " type laminar flow refrigerative type of cooling, the coiling temperature interval is 620 ℃～680 ℃; Said " U " type laminar flow Cooling Control model is that each 15m of end end to end of hot-rolled sheet is not cold or few cold, and temperature is 800 ± 30 ℃, and middle portion adopts strong cold mode, and temperature is positioned at the coiling temperature interval; It is above until coiling temperature that the speed of cooling of hot-rolled sheet remains on 30 ℃/s after the said finish to gauge; The higher austenitic stainless steel of said carbon content is the SUS301 austenitic stainless steel.
2. the heat processing technique of austenitic stainless steel hot-rolled coil as claimed in claim 1 is characterized in that: said coiling temperature interval is 620 ℃～650 ℃.
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| CN2007100368634A CN101230413B (en) | 2007-01-26 | 2007-01-26 | Heat processing technique for austenitic stainless steel hot-rolling coil with high carbon content |
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| CN101230413B true CN101230413B (en) | 2012-07-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289654A (en) * | 2000-10-14 | 2001-04-04 | 河北鹏发钢业股份有限公司 | Technology for thermally rolling narrow stainless steel band on ordinary semi-continuous 450-mm rolling mill |
| CN1483528A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Three section laminar flow cooling technology for hot rolling band steel |
| CN1625447A (en) * | 2002-01-31 | 2005-06-08 | Sms迪马格股份公司 | Method and installation for producing a hot rolled strip from austenitic rust-resistant steels |
| CN1788870A (en) * | 2004-12-14 | 2006-06-21 | 宝钢集团上海第一钢铁有限公司 | On-line heat treatment method for hot rolling stainless steel band for cold rolling |
-
2007
- 2007-01-26 CN CN2007100368634A patent/CN101230413B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1289654A (en) * | 2000-10-14 | 2001-04-04 | 河北鹏发钢业股份有限公司 | Technology for thermally rolling narrow stainless steel band on ordinary semi-continuous 450-mm rolling mill |
| CN1625447A (en) * | 2002-01-31 | 2005-06-08 | Sms迪马格股份公司 | Method and installation for producing a hot rolled strip from austenitic rust-resistant steels |
| CN1483528A (en) * | 2002-09-19 | 2004-03-24 | 鞍钢集团新钢铁有限责任公司 | Three section laminar flow cooling technology for hot rolling band steel |
| CN1788870A (en) * | 2004-12-14 | 2006-06-21 | 宝钢集团上海第一钢铁有限公司 | On-line heat treatment method for hot rolling stainless steel band for cold rolling |
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Effective date of registration: 20170215 Address after: 580 Baoshan District Changjiang Road, Shanghai, No. 200431 Patentee after: Baosteel Stainless Steel Co.,Ltd. Address before: 201900 Fujin Road, Shanghai, orchard, Baoshan District Patentee before: Baoshan Iron & Steel Co., Ltd. |
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Granted publication date: 20120704 Termination date: 20200126 |