CN101745532B - Preparation method of thick medium and high chromium ferritic stainless steel - Google Patents
Preparation method of thick medium and high chromium ferritic stainless steel Download PDFInfo
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- CN101745532B CN101745532B CN2008102047261A CN200810204726A CN101745532B CN 101745532 B CN101745532 B CN 101745532B CN 2008102047261 A CN2008102047261 A CN 2008102047261A CN 200810204726 A CN200810204726 A CN 200810204726A CN 101745532 B CN101745532 B CN 101745532B
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Abstract
The invention discloses a preparation method of thick medium and high chromium ferritic stainless steel. The method comprises the following steps: 1. processing ferritic stainless steel stock to obtain steel coils with scale; 2. performing steel belt temperature and first pass cold rolling on the steel coils with scale which are processed through hot rolling; 3. annealing heat treatment; and 4. pickling. By using the method of the invention, the plasticity of thick ferritic stainless steel can be increased, the steel belt breaking phenomenon can be effectively avoided, the scale on the surface of the body can be effectively peeled and the scale on the surface of the material is easier to remove through the annealing and pickling treatments, compared with the conventional technology. In addition, the internal grain size of the material which is processed through cold rolling and annealing is smaller so that the main performances of the material such as yield ratio can be optimized and become more reasonable and the surface roughness of the finished product can be better improved.
Description
Technical field
The present invention relates to a kind of stainless manufacturing approach, relate in particular to a kind of method of utilizing the middle and high chrome ferritic stainless steel of the stainless waste heat of hot rolled ferrite (band temperature) and band iron scale cold rolling feeds thickness >=5mm, belong to stainless steel product and make the field.
Background technology
Ferritic stainless steel, particularly C, middle and high chromium (referring to that wherein the weight percent content of Cr is respectively 16～20%, 20～30%) ferritic stainless steel that N content is lower are favored more and more.This is because it is compared with traditional C, the higher ferritic stainless steel of N content, decay resistance with shape performance and all have significant improvement, its combination property is superior to nickeliferous austenitic stainless steel in many application scenarios.But middle and high chrome ferritic stainless steel production fault in manufacture process is many, the difficult control of surface quality, rolls up in the annealing and pickling process at the band iron scale when ferritic stainless steel especially, and run into very big difficulty and be: scale on surface is difficult to be removed.Owe the residual point corrosion pit that causes with overpickling of iron scale that pickling causes; Brought negative effect all for the surface quality and the serviceability of ferritic stainless steel; In order to remove scale on surface; In cold-rolled process, have to increase some operations, to reach the purpose of removing the ferritic stainless steel scale on surface.Not only will increase cold rolling manufacturing procedure for this reason, influence production efficiency, and production cost also increases many.The another one relatively problem of difficulty is: the ferritic stainless steel of thick partially specification is when pickling and cold rolling first passage, and before rolling of especially annealing caused serious production accidents such as broken belt easily.For guaranteeing carrying out smoothly of this type of cold-rolled plate rolling process; Can not use the band iron scale volume raw material of thick partially specification; Therefore because cold rolling reduction ratio is on the low side less than 60%, make the above cold rolling finished surface quality of 2.0mm thickness difficulty reach gratifying effect.
China publication number CN1334757, the patent that is entitled as " method and the integrated rolling mill line that are used to produce stainless strip " are the patents of invention of the dust Vesta AG & Co. OHG in Europe; Content is only mentioned the rolling mill practice to the austenite band iron scale of grade of steel ASTM304; Do not disclose manufacturing process with warm cold rolling ferritic stainless steel, and the stainless manufacturing process of the also not mentioned in an embodiment rolling ferrite of any band iron scale.China publication number CN88103090, the patent that is entitled as " stainless steel is anticipated so that cold rolling method and apparatus " are the patents of invention of Kawasaki Steel Corp; It is to after the stainless steel annealing pickling processes; The rolling mill practice method that a kind of not adding technology before cold rolling is lubricated, these are different fully with content of the present invention.
Summary of the invention
The manufacturing approach that the purpose of this invention is to provide the middle and high chrome ferritic stainless steel of a kind of thick specification; It can solve the problem of the difficult pickling of middle and high chrome ferritic stainless steel scale on surface that exists in the prior art; And the middle and high chrome ferritic stainless steel band iron scale that can prevent thick specification twists in the belt phenomenon that occurs in cold rolling or the corase grind operation, the generation that reduces production accident; Simultaneously more can effectively promote material surface iron scale and ferritic stainless steel body to peel off, improve the surface acid-washing quality of ferritic stainless steel and the material property of hot rolling annealing and pickling volume.
Technical conceive of the present invention is following: to the difficult manufacturing bottleneck of removing of easy broken belt and scale on surface in the thick specification ferritic stainless steel manufacturing process; Utilize the production waste heat of middle and high chrome ferritic stainless steel band iron scale volume; Direct cold rolling a time is annealing and pickling again, at first, can significantly improve the cold-shortness of ferrite stainless steel thick plate; Effectively improve the plasticity and toughness of material, prevent operation of rolling broken belt accident; Secondly, the rolling ferritic stainless steel of band iron scale can significantly increase peeling off of ferritic stainless steel scale on surface and body, effectively improves the pickling quality of stainless steel surfaces.The 3rd; Compare the common process of ferritic stainless steel band iron scale volume (not cold rolling) annealing and pickling; Band temperature, band iron scale direct cold rolling are annealed again; Can make the more refinement of ferritic stainless steel grain size, structure property more even, the state of material surface roughness ratio hot rolling annealing and pickling volume is significantly improved.
The objective of the invention is to realize like this: the manufacturing approach of the middle and high chrome ferritic stainless steel of a kind of thick specification comprises:
Step 1 is processed into band iron scale coil of strip with the hot rolling of ferrite stainless steel billet;
Step 2 is with temperature and a time cold rolling to the band iron scale coil of strip of hot rolling;
Step 3, annealing heat treatment;
Step 4, pickling processes.
Preferably, also comprise: step 5, following a time cold-rolling treatment, annealing heat treatment, pickling and finishing.
Preferably, the cold rolling reduction ratio of a time in the said step 2 is not less than 20%.
Preferably, the cold rolling reduction ratio accumulative total of the following a time in the said step 5 is not less than 60%.
Preferably, the band Wen Wendu in the said step 2 is 40～70 ℃.
Preferably, the annealing heat treatment temperature in said step 3 and the step 5 is 1050～1100 ℃.
The present invention is owing to adopted above technical scheme; Make it compared with prior art; Have the following advantages and good effect: the gentle band of the band iron scale of implementing 40～70 ℃ of temperature ranges through centering, high chromium content ferrite stainless steel is rolling; And control reduction ratio be not less than 20%, can improve the plasticity and toughness of the ferritic stainless steel of thick specification, can effectively avoid belt phenomenon; Simultaneously scale on surface and body are effectively peeled off, annealedly again the scale on surface of material will be removed more easily than traditional handicraft with pickling processes.In addition, its more refinement of inner grain size of material of annealing again after cold rolling, thus the main performances such as yield tensile ratio of material are optimized more, rationally, the roughness of finished surface also has better improvement.
The specific embodiment
At first, on production line, get 6 on the ferritic stainless steel sample of 444 trades mark, the size of its length is respectively 5mm, 300mm and 600mm.Appoint and get 5 samples wherein; After one by one it being carried out hot rolling and is processed into band iron scale coil of strip; Go up in 40～70 ℃ temperature range respectively with greater than cold rolling a time of reduction ratio (concrete temperature, reduction ratio numerical value see the following form 2) of 20% in reversible 4 roller monolithic EXPERIMENTAL COLD ROLLING MILL TYPE (scheming not shown) again; Anneal subsequently, pickling processes, annealing and acid cleaning process employing common process.Get last piece sample example as a comparison again, handle, promptly be rolled into earlier and be with the iron scale coil of strip according to existing common process, again to its anneal, pickling processes.
Get the sample of processing according to existing common process, get simultaneously, their correspondences are carried out 100 times metallographic structure and amplify according to one of 5 made samples of the present invention.The grain size of metallographic structure was visible after paired observation was amplified, and the grain size of the sample that common process is processed is 4.5 grades, and is thicker relatively; And the grain size of the sample that the inventive method is processed is 6.5 grades, and is relatively tiny, and relatively evenly.This Metallographic Analysis is the result show, the inventive method can make ferrite stainless steel material comprise the comprehensive existing conventional technology that obviously is superior to of inherent quality etc.
Appoint 3 that get according in made 5 samples of the present invention, when normal temperature, 40 ℃ and 70 ℃, carry out the ballistic work data test, the gained data are recorded in the following table 1.Can find out that from this table after the raising along with material temperature, shock resistance is significantly improved, brittle transition temperature descends, and proves that this stainless steel material reduces in the risk of operation broken belts such as cold rolling, corase grind greatly.
Table 1 normal temperature be with warm ballistic work reduced parameter
Get arbitrary in above-mentioned 5, it is carried out 150 times ESEM amplification through the cold rolling forward and backward band iron scale coil of strip surface of a time.Contrast the two and can know and find out, the scale on surface of the sample through a time after cold rolling peels off situation obviously more than without cold rolling sample, and this shows also that a time cold-rolling process of increase is handled can make the material surface iron scale significantly removed.
In following table 2, combine hot rolling, band temperature and a time is cold rolling, the technological parameter of annealing, acid cleaning process implementation process, also listed the parameter value of existing common process Comparative Examples simultaneously, wherein used nitration mixture is hydrofluoric acid (HF) and nitric acid (HNO
3).
Table 2 a time is cold rolling, annealing and acid cleaning process parameter
Table 3 mechanical property and roughness value
If bend/strong, show that then the security of material is high more than more little.Table 3 is mechanical property and the surface roughness parameter value of above-mentioned 6 samples of final actual measurement, shows that by its result the inventive method processes the bending of sample/strong than being about 0.68, for than produce the bending of sample/by force than 0.77 existing obvious improvement according to common process.Simultaneously, contrast roughness test result explains that also the inventive method compares common process, for the performance improvement of ferrite stainless steel material significant effect is arranged also.
Appoint two that get in 5 samples that the inventive method processes, taken pictures in its surface.Simultaneously, the sample of also existing common process being processed under equal conditions carries out the surface and takes pictures, and naked eyes are visible after identical time same concentrations pickling obviously, and the former surface quality all obviously is superior to the latter.
At last, can also descend a time cold-rolling treatment to the sample of the foregoing description, annealing heat treatment, pickling and finishing are handled, and further improve its combination property with this.Wherein, the cold rolling reduction ratio of following a time accumulative total should be not less than 60%, and the annealing heat treatment temperature is identical with annealing heat treatment temperature in the previous process steps, and temperature range also is 1050～1100 ℃.
To sum up result of the test shows; Adopt the inventive method to make the middle and high chrome ferritic stainless steel of thick specification; Not only can significantly promote the scale on surface of ferritic stainless steel and peeling off of body, improve its surface quality, and more can effectively promote grain size refinement, the structure property homogenising of material; Improve its mechanical property, thereby can effectively prevent the generation of broken belt accident.
Those of ordinary skill in the art will be appreciated that; Above embodiment is used for explaining the present invention; And be not to be used as qualification of the present invention; As long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (6)
1. the manufacturing approach of the middle and high chrome ferritic stainless steel of thick specification is characterized in that comprising:
Step 1 is processed into band iron scale coil of strip with the hot rolling of ferrite stainless steel billet;
Step 2 is with temperature and a time cold rolling to the band iron scale coil of strip of hot rolling, band Wen Wen
Degree is 40～70 ℃;
Step 3, annealing heat treatment;
Step 4, pickling processes.
2. the manufacturing approach of the middle and high chrome ferritic stainless steel of thick specification as claimed in claim 1 is characterized in that also comprising: step 5, following a time cold-rolling treatment, annealing heat treatment, pickling and finishing.
3. the manufacturing approach of the middle and high chrome ferritic stainless steel of thick specification as claimed in claim 1 is characterized in that: the cold rolling reduction ratio of a time in the said step 2 is not less than 20%.
4. the manufacturing approach of the middle and high chrome ferritic stainless steel of thick specification as claimed in claim 2 is characterized in that: the cold rolling reduction ratio accumulative total of the following a time in the said step 5 is not less than 60%.
5. the manufacturing approach of the middle and high chrome ferritic stainless steel of thick specification as claimed in claim 1 is characterized in that: the annealing heat treatment temperature in the said step 3 is 1050～1100 ℃.
6. like the manufacturing approach of claim 2 or the middle and high chrome ferritic stainless steel of 4 described thick specifications, it is characterized in that: the annealing heat treatment temperature in said step 3 and the step 5 is 1050～1100 ℃.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102047261A CN101745532B (en) | 2008-12-17 | 2008-12-17 | Preparation method of thick medium and high chromium ferritic stainless steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102047261A CN101745532B (en) | 2008-12-17 | 2008-12-17 | Preparation method of thick medium and high chromium ferritic stainless steel |
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| Publication Number | Publication Date |
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| CN101745532A CN101745532A (en) | 2010-06-23 |
| CN101745532B true CN101745532B (en) | 2012-01-11 |
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| CN2008102047261A Expired - Fee Related CN101745532B (en) | 2008-12-17 | 2008-12-17 | Preparation method of thick medium and high chromium ferritic stainless steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103215422A (en) * | 2013-04-06 | 2013-07-24 | 山东泰山钢铁集团有限公司 | Method for plastically producing thin stainless steel cold-rolled plates by utilizing hot-rolled steel bands |
| CN113201636A (en) * | 2021-04-21 | 2021-08-03 | 鞍钢联众(广州)不锈钢有限公司 | Method for producing ultrapure ferrite stainless steel by continuous rolling annealing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5197179A (en) * | 1991-04-18 | 1993-03-30 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
| ES2226489T3 (en) * | 1998-12-18 | 2005-03-16 | Outokumpu Stainless Ab | METHOD FOR MANUFACTURING STAINLESS STEEL BANDS AND INTEGRATED LAMINATION TRAIN. |
| CN1721128A (en) * | 2004-07-14 | 2006-01-18 | 天津市天材科技发展有限公司 | Cold working process for high Cr ferrite stainless steel seamless pipe |
| CN101135028A (en) * | 2006-08-30 | 2008-03-05 | 宝山钢铁股份有限公司 | High-strength stainless steel and thermal treatment process |
-
2008
- 2008-12-17 CN CN2008102047261A patent/CN101745532B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5197179A (en) * | 1991-04-18 | 1993-03-30 | T. Sendzimir, Inc. | Means and a method of improving the quality of cold rolled stainless steel strip |
| ES2226489T3 (en) * | 1998-12-18 | 2005-03-16 | Outokumpu Stainless Ab | METHOD FOR MANUFACTURING STAINLESS STEEL BANDS AND INTEGRATED LAMINATION TRAIN. |
| CN1721128A (en) * | 2004-07-14 | 2006-01-18 | 天津市天材科技发展有限公司 | Cold working process for high Cr ferrite stainless steel seamless pipe |
| CN101135028A (en) * | 2006-08-30 | 2008-03-05 | 宝山钢铁股份有限公司 | High-strength stainless steel and thermal treatment process |
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