CN102925904A - Thermal annealing acid-washing method of stainless steel wide and thick plate coil - Google Patents
Thermal annealing acid-washing method of stainless steel wide and thick plate coil Download PDFInfo
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Abstract
The invention relates to a thermal annealing acid-washing method of a stainless steel wide and thick plate coil, which comprises the following steps of: uncoiling an inlet of the stainless steel wide and thick plate coil, welding, continuously annealing, breaking scales shot-blasting, acid-washing, flattening, and coiling an outlet of the stainless steel wide and thick plate coil, wherein the groove depth of a welding girder is 1.0-1.5mm; 3-6 annealing furnaces with the total length of 75-150m are adopted in continuous annealing, the annealing temperature is 1000-1150 DEG C, and the annealing time is 10-20min; in the shot blasting process, the blasting speed is 1500-2250rpm, the blasting quantity is 600-100kg/min, and the blasting particle has a grain size of 0.5-0.7mm; and in the acid washing step, acid washing is carried out by adopting mixed acid of hydrofluoric acid and nitric acid in 3-6 sections of grooves. By adopting the method, in a continuous annealing acid-washing process of the stainless steel wide and thick plate coil, problems of strip breakage, poor material property, poor surface quality, reeling off, surface scratching and the like can be avoided as much as possible.
Description
Technical field
The present invention relates to a kind of thermal annealing acid washing method of stainless steel coiled sheet, particularly relate to the generous coiled sheet Continuous Heat of a kind of stainless steel annealing and pickling method, belong to metallurgical technology field.
Background technology
Along with the development of energy industry and heavy chemical industry, the Wide and Thick Slab consumption rises year by year.For adapting to the manufacturings such as oil, gas equal energy source transport pipe and pressurized vessel to the demand of Wide and Thick Slab, particularly to the stainless demand of thickness 12.7-20mm, width 1500-2000mm, the existing stainless steel Wide and Thick Slab mode of production mainly adopts the mode of production of uni-tension rolling and annealing and coil rolling and continuous annealing.But uni-tension rolling production efficiency is lower, coil rolling efficient height but have the Continuous Heat annealing and pickling problems such as rack of fusion, thermal treatment, surface quality are bad, curling difficulty on the production technology.The problems referred to above can cause occuring in the coiled sheet production that broken belt, bad material, surface quality are poor, loose winding, surface tear etc., have a strong impact on the product lumber recovery.And have no report about the generous coiled sheet Continuous Heat of stainless steel annealing and pickling method.
Therefore, developing the thermal annealing acid washing method that is applicable to the stainless steel Wide and Thick Slab is one of this area problem demanding prompt solution.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide the Continuous Heat annealing and pickling method of the generous coiled sheet of a kind of stainless steel, the problems such as broken belt, bad material, surface quality are poor by adopting the method that the stainless steel Wide and Thick Slab is twisted in to avoid as much as possible occuring in the Continuous Heat annealing and pickling process, loose winding, surface tear are rolled into just rate thereby improve the stainless steel Wide and Thick Slab.
For achieving the above object, the invention provides the generous coiled sheet thermal annealing of a kind of stainless steel acid washing method, it may further comprise the steps: the stainless steel Wide and Thick Slab be involved in a mouthful uncoiling, welding, continuous annealing, scale breading, ball blast, pickling, smooth, outlet is curling, wherein:
In described welding step, the welded girder groove depth is controlled at 1.0-1.5mm;
In described continuous annealing step, the employing overall length is that 3-6 the annealing furnace of 75-150m carries out, annealing temperature is controlled to be 1000-1150 ℃, annealing time and is controlled to be 10-20 minute, described stainless steel Wide and Thick Slab is twisted in the long cooling apparatus of 20-30m cool off;
In described ball blast step, velocity of projection is controlled to be 1500-2250rpm, and the projection amount is controlled to be 600-1000kg/min, the ball blast granular size is particle diameter 0.5-0.7mm;
In described acid pickling step, adopt the nitration mixture that is formed by hydrofluoric acid and nitric acid in 3-6 section groove, to carry out pickling, wherein, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 80-120g/L.
In the welding step of above-mentioned thermal annealing acid washing method, the welded girder groove depth can be controlled at 1.0-1.5mm, and too shallow weld seam insufficient strength ftractures easily and broken belt occurs aborning.Preferably, this welding step adopts the welding wire of diameter 1.6-2.0mm, and weldingvoltage is controlled to be 35-40V, and the welding machine speed control is 0.3-0.5m/min; Can guarantee that like this molten metal can permeate weld seam in the molten bath, guarantee weldquality.Above-mentioned welding can adopt the mode of two welding guns to carry out, and owing to welding speed affects normal problem of producing slowly, adopts two welding guns to weld simultaneously in the time of can avoiding adopting single welding gun, can shorten weld interval.
In the continuous annealing step of above-mentioned thermal annealing acid washing method, the employing overall length is that 3-6 the annealing furnace of 75-150m carries out, annealing temperature is controlled to be 1000-1150 ℃, annealing time and is controlled to be 10-20 minute, and the stainless steel Wide and Thick Slab is cooled off in the long cooling apparatus of 20-30m; Processing like this assurance Wide and Thick Slab fully anneals; The target grain size number is in the 7-9 level, and Rockwell hardness number HRB is at 80-90.
In the ball blast step, velocity of projection is controlled to be 1500-2250rpm, and the projection amount is controlled to be 600-1000kg/min, the ball blast granular size is particle diameter 0.5-0.7mm; Can strengthen the scale removal ability like this, solve the difficult problem of removing of Wide and Thick Slab oxide skin.
In acid pickling step, adopt the nitration mixture that is formed by hydrofluoric acid and nitric acid in 3-6 section groove, to carry out pickling, wherein, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 80-120g/L; Can strengthen the pickling ability like this, improve surface quality.Simultaneously, in order to guarantee abundant pickling, preferably, add how group high strength brush rolls are scrubbed before pickling with in the middle of the pickling, brush roll is scrubbed rotating speed and is controlled to be 600-1200rpm, and scrubbing current control is 150-350A.
In aforesaid method provided by the invention, preferably, in the curling step of outlet, add curling supporting roll, be used for supporting the generous coiled sheet of stainless steel through curling.Tension force was very large when Wide and Thick Slab was curling, and the stress that occurs when curling is corresponding very large, can cause curling rear loose winding to occur, and added curling supporting roll, can guarantee curling normal operation.More preferably, above-mentioned supporting roll is installed in before and after the downside of crimping machine each one, supporting roll is can jack-up auxiliary carry out curling.This supporting roll can be telescopic, and jack-up is auxiliary when the slab operation carries out curlingly, and rolled efficiency is obviously improved.
In aforesaid method provided by the invention, preferably, the material of above-mentioned stainless steel Wide and Thick Slab is austenitic stainless steel 304,316L, 321, high alloy austenitic stainless steel 309S, 310S, dual phase steel series 329J3L, 200 series austenitic stainless steel or 400 are ferritic stainless steel etc.
In aforesaid method provided by the invention, preferably, above-mentioned stainless steel Wide and Thick Slab refers to that thickness is the stainless steel plate of 12.7-20mm, width 1500-2000mm.
The problems such as broken belt, bad material, surface quality are poor by adopting the generous coiled sheet thermal annealing of stainless steel provided by the present invention acid washing method that the stainless steel Wide and Thick Slab is twisted in to avoid as much as possible occuring in the Continuous Heat annealing and pickling process, loose winding, surface tear, thus stainless steel Wide and Thick Slab lumber recovery improved.Have good surface quality and material capability by the generous coiled sheet of stainless steel steel that adopts thermal annealing acid washing method provided by the invention manufacturing, improved significantly the product lumber recovery.
Description of drawings
The weldquality of the stainless steel Wide and Thick Slab that Fig. 1 a and Fig. 1 b provide for embodiment 1 and curved detection be figure as a result;
Annealing mechanical property and the Grain size analysis result of the stainless steel Wide and Thick Slab that Fig. 2 provides for embodiment 1;
Fig. 3 a and Fig. 3 b are surperficial EPMA shape appearance figure and the variation diagram of the stainless steel Wide and Thick Slab after embodiment 1 processes;
Fig. 4 is the set-up mode synoptic diagram of supporting roll.
Embodiment
Understand for technical characterictic of the present invention, purpose and beneficial effect being had more clearly, existing technical scheme of the present invention is carried out following detailed description, but but can not be interpreted as restriction to practical range of the present invention.
Present embodiment provides the thermal annealing acid washing method of the generous coiled sheet of a kind of stainless steel, and the thickness of this stainless steel Wide and Thick Slab is 16.0mm, and width is 1500mm, and steel grade is SUS304, and this thermal annealing acid washing method may further comprise the steps:
The stainless steel Wide and Thick Slab is involved in the line entry uncoiling;
To welding machine, adopt two welding guns to weld the logical plate of stainless steel Wide and Thick Slab, the voltage control of welding current is 38V, welding speed is controlled to be 0.35m/min, and gage of wire is 2.0mm, and initial welded girder groove depth is 1.0mm, use can be polished with after the pit wearing and tearing, the deeplyest can not surpass 1.5mm; After welding is finished, confirm weldquality, weldquality is intact, and the production line operation enters the annealing section;
Carry out anneal in annealing furnace, annealing temperature is controlled to be 1125-1130 ℃, and annealing speed is controlled to be 5m/min, through the annealing of 18min, finishes annealing process, through the water-cooled section, thermal zone steel is cooled to the normal temperature state rapidly; Above-mentioned annealing furnace overall length 90m is divided into preheating section 23m, heating zone 45m, cooling section and drying section 22m, and wherein, heating zone is comprised of 4 annealing furnaces;
Just enter the stage of descaling after annealing is finished, at first adopt physics dephosphorization equipment descaling mill to process, enter shot-blasting machine through after the crooked broken skin of descaling mill;
Carry out Shot Blasting in shot-blasting machine, wherein, the shot-blasting machine velocity of projection is controlled to be 2195rpm, and unit time projection amount is controlled to be 780kg/min, and the ball blast granular size is particle diameter 0.6mm;
Enter nitration mixture pickling section after finishing Shot Blasting, wherein, the concentration of hydrofluoric acid is 33g/L, concentration of nitric acid is 105g/L, and the nitration mixture temperature is controlled to be 60 ℃, during utilize washing device to scrub, guarantee that pickling oxide skin out breaks away from steel strip surface fully, scrubbing rotating speed is 1200rpm, and scrubbing current control is 260A, finishes pickling behind the 15min;
Utilize the surface of the smooth stainless steel Wide and Thick Slab of levelling machine, export curlingly, respectively lay a telescopic supporting roll (as shown in Figure 4) before and after the downside of crimping machine, it is curling that front support roller 1 and rear support roller 2 will be withs steel 3 jack-up assisting to carry out;
Finish the institute of this thermal annealing acid washing method in steps.
Fig. 1 a and Fig. 1 b are the weldquality curved detection result through the stainless steel Wide and Thick Slab after the welding.As shown in Figure 1a, section of weld joint was sheared after welding was finished, and weld seam is connected fully with matrix, does not produce pore and gap.Do crooked and tension test detection weldquality, its result is shown in Fig. 1 b, and cracking phenomena does not rupture behind the 90-degree bent.The tensile strength of this stainless steel Wide and Thick Slab is 600N/mm
2, reaching normal Wide and Thick Slab stainless steel tensile strength, weld seam detection result is good, and the assurance Wide and Thick Slab can be led to the plate operation continuously.
Fig. 2 is annealing mechanical property and the Grain size analysis result of treated stainless steel Wide and Thick Slab.As shown in Figure 2, the mechanical property of this stainless steel Wide and Thick Slab meets the SUS304 standard, and grain size number is up to standard, Wide and Thick Slab mechanical property and grain fineness number conformance with standard.
Fig. 3 a and Fig. 3 b are respectively surperficial EPMA shape appearance figure (amplifying 100 times) and the variation diagrams of processing stainless steel Wide and Thick Slab afterwards through the method that embodiment 1 provides.Shown in Fig. 3 a and Fig. 3 b, the surface of the stainless steel Wide and Thick Slab after processing is more smooth evenly, there is not oxide skin and so on to remain in the surface, find that by 100 times of morphology analysis of EPMA the surface is more even, each component content is shown as the SUS304 matrix composition, the surface does not have all the other impurity residual, and de-scaling and pickling can be preferably removals such as oxide skins, and the composition analysis result is as shown in table 1.
Table 1EPMA composition analysis result
| FEL | wt(％) |
| Fe | 69.509 |
| Cr | 19.975 |
| Ni | 8.417 |
| Mn | 1.355 |
Can find out that by the above results the stainless steel Wide and Thick Slab after processing by the thermal annealing acid washing method that adopts embodiment 1 to provide has good surface quality and material capability, illustrates that the method is a kind of good stainless steel Wide and Thick Slab thermal annealing acid washing method.
Claims (7)
1. the generous coiled sheet thermal annealing of stainless steel acid washing method, it may further comprise the steps: the stainless steel Wide and Thick Slab be involved in a mouthful uncoiling, welding, continuous annealing, scale breading, ball blast, pickling, smooth, outlet is curling, wherein:
In described welding step, the welded girder groove depth is controlled at 1.0-1.5mm;
In described continuous annealing step, the employing overall length is that 3-6 the annealing furnace of 75-150m carries out, annealing temperature is controlled to be 1000-1150 ℃, annealing time and is controlled to be 10-20 minute, described stainless steel Wide and Thick Slab is twisted in the long cooling apparatus of 20-30m cool off;
In described ball blast step, velocity of projection is controlled to be 1500-2250rpm, and the projection amount is controlled to be 600-1000kg/min, the ball blast granular size is particle diameter 0.5-0.7mm;
In described acid pickling step, adopt the nitration mixture that is formed by hydrofluoric acid and nitric acid in 3-6 section groove, to carry out pickling, wherein, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 80-120g/L.
2. the generous coiled sheet thermal annealing of stainless steel according to claim 1 acid washing method, wherein, described welding step adopts the welding wire of diameter 1.6-2.0mm, and weldingvoltage is controlled to be 35-40V, the welding machine speed control is 0.3-0.5m/min, adopts the mode of two welding guns to weld.
3. the generous coiled sheet thermal annealing of stainless steel according to claim 1 acid washing method wherein, adds how group high strength brush rolls are scrubbed before pickling with in the middle of the pickling, and brush roll is scrubbed rotating speed and is controlled to be 600-1200rpm, and scrubbing current control is 150-350A.
4. the generous coiled sheet thermal annealing of stainless steel according to claim 1 acid washing method wherein, in the curling step of described outlet, adds curling supporting roll, is used for supporting the generous coiled sheet of stainless steel through curling.
5. the generous coiled sheet thermal annealing of stainless steel steel according to claim 4 acid washing method, wherein, described supporting roll is installed in before and after the downside of crimping machine each one, described supporting roll is can jack-up auxiliary carry out curling.
6. the generous coiled sheet thermal annealing of each described stainless steel acid washing method according to claim 1-5, wherein, the material of the generous coiled sheet of described stainless steel is austenitic stainless steel 304,316L, 321, high alloy austenitic stainless steel 309S, 310S, dual phase steel series 329J3L, 200 series austenitic stainless steel or 400 are ferritic stainless steel.
7. the generous coiled sheet thermal annealing of each described stainless steel acid washing method according to claim 1-6, wherein, the generous coiled sheet of described stainless steel refers to that thickness is the volume that the stainless steel plate of 12.7-20mm, width 1500-2000mm is rolled into.
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| CN103243339A (en) * | 2013-04-16 | 2013-08-14 | 山西太钢不锈钢股份有限公司 | Continuous annealing and acid washing method for medium-chromium ultrapure ferrite stainless steel |
| CN103801582A (en) * | 2014-01-28 | 2014-05-21 | 张家港浦项不锈钢有限公司 | Nickel-saving type stainless steel processing method |
| CN103882456A (en) * | 2014-03-18 | 2014-06-25 | 中冶南方工程技术有限公司 | Annealing-pickling method for hot-rolled 436 L ultra-pure ferrite stainless strip steel |
| CN103882218A (en) * | 2014-03-18 | 2014-06-25 | 中冶南方工程技术有限公司 | Steel annealing and pickling method for hot-rolled 430 ferrite stainless steel band |
| CN103920726A (en) * | 2014-03-27 | 2014-07-16 | 中冶南方工程技术有限公司 | High-surface-quality carbon steel pickling technique |
| CN104032123A (en) * | 2014-06-16 | 2014-09-10 | 中冶南方工程技术有限公司 | Annealing-pickling production method of cold-rolled 430 ferritic stainless steel strip |
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| CN107502731A (en) * | 2017-09-18 | 2017-12-22 | 张家港浦项不锈钢有限公司 | A kind of generous coiled sheet thermal annealing acid washing method of stainless steel |
| CN112323082A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Annealing and pickling method for duplex stainless steel strip and steel strip produced by using method |
| CN114045378A (en) * | 2021-10-18 | 2022-02-15 | 山西太钢不锈钢股份有限公司 | Method for improving surface cleanliness of heat-resistant steel |
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| CN103243339A (en) * | 2013-04-16 | 2013-08-14 | 山西太钢不锈钢股份有限公司 | Continuous annealing and acid washing method for medium-chromium ultrapure ferrite stainless steel |
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| CN103882456A (en) * | 2014-03-18 | 2014-06-25 | 中冶南方工程技术有限公司 | Annealing-pickling method for hot-rolled 436 L ultra-pure ferrite stainless strip steel |
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| CN103882218B (en) * | 2014-03-18 | 2016-06-01 | 中冶南方工程技术有限公司 | Hot rolling 430 ferritic stainless steel strip steel annealing and pickling method |
| CN103920726A (en) * | 2014-03-27 | 2014-07-16 | 中冶南方工程技术有限公司 | High-surface-quality carbon steel pickling technique |
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| CN104032123B (en) * | 2014-06-16 | 2016-03-30 | 中冶南方工程技术有限公司 | A kind of cold rolling 430 ferritic stainless steel strip steel annealing and pickling production methods |
| CN104032123A (en) * | 2014-06-16 | 2014-09-10 | 中冶南方工程技术有限公司 | Annealing-pickling production method of cold-rolled 430 ferritic stainless steel strip |
| CN107142360A (en) * | 2017-06-12 | 2017-09-08 | 山西太钢不锈钢股份有限公司 | A kind of method of raising SUS410L stainless steel annealing stability |
| CN107142360B (en) * | 2017-06-12 | 2018-10-26 | 山西太钢不锈钢股份有限公司 | A method of improving SUS410L stainless steel annealing stability |
| CN107502731A (en) * | 2017-09-18 | 2017-12-22 | 张家港浦项不锈钢有限公司 | A kind of generous coiled sheet thermal annealing acid washing method of stainless steel |
| CN112323082A (en) * | 2020-09-28 | 2021-02-05 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Annealing and pickling method for duplex stainless steel strip and steel strip produced by using method |
| CN112323082B (en) * | 2020-09-28 | 2022-09-09 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Annealing and pickling method for duplex stainless steel strip and steel strip produced by using annealing and pickling method |
| CN114045378A (en) * | 2021-10-18 | 2022-02-15 | 山西太钢不锈钢股份有限公司 | Method for improving surface cleanliness of heat-resistant steel |
| CN115110084A (en) * | 2022-06-15 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Pickling method of duplex stainless steel cold-rolled strip steel |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
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Address after: 215625 Yangtze River Metallurgical Industrial Park, Zhangjiagang City, Jiangsu Province Patentee after: Puxiang (Zhangjiagang) Stainless Steel Co., Ltd. Address before: 215625 Yangtze River Metallurgical Industrial Park, Zhangjiagang City, Jiangsu Province Patentee before: Puxiang Stainless Steel Co Ltd, Shangjiagang |