CN102925904B - 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, Wide and Thick Slab consumption rises year by year.For adapting to oil, gas equal energy source transport pipe and pressurized vessel etc., manufacture the demand to Wide and Thick Slab, the stainless demand to thickness 12.7-20mm, width 1500-2000mm particularly, the existing stainless steel Wide and Thick Slab mode of production mainly adopts the mode of production of uni-tension rolling annealing and coil rolling continuous annealing.But uni-tension rolling production efficiency is lower, coil rolling efficiency is high but in production technology, have the Continuous Heat annealing and pickling problems such as rack of fusion, thermal treatment, surface quality are bad, curling difficulty.The problems referred to above can cause that coiled sheet occurs that broken belt, bad material, surface quality are poor in producing, loose winding, surface tear etc., have a strong impact on product lumber recovery.And have no report about the generous coiled sheet Continuous Heat of stainless steel annealing and pickling method.
Therefore the thermal annealing acid washing method that, exploitation is applicable to 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 can make stainless steel Wide and Thick Slab twist in to avoid as much as possible occurring in Continuous Heat annealing and pickling process, loose winding, surface tear, are rolled into just rate thereby improve 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 comprises the following steps: stainless steel Wide and Thick Slab be involved in a mouthful uncoiling, welding, continuous annealing, scale breading, ball blast, pickling, smooth, export curling, wherein:
In described welding step, welded girder groove depth is controlled at 1.0-1.5mm;
In described continuous annealing step, adopt 3-6 the annealing furnace that overall length is 75-150m to carry out, annealing temperature is controlled as 1000-1150 ℃, annealing time and is controlled as 10-20 minute, makes described stainless steel Wide and Thick Slab twist in to carry out in the long cooling apparatus of 20-30m cooling after annealing;
In described ball blast step, velocity of projection is controlled as 1500-2250rpm, and it is that 600-1000kg/min, ball blast granular size are particle diameter 0.5-0.7mm that projection amount is controlled;
In described acid pickling step, adopt the nitration mixture being formed by hydrofluoric acid and nitric acid to carry out pickling in 3-6 section groove, 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, welded girder groove depth can be controlled at 1.0-1.5mm, and too shallow weld seam insufficient strength easily ftractures and occurs aborning broken belt.Preferably, this welding step adopts the welding wire of diameter 1.6-2.0mm, and weldingvoltage is controlled as 35-40V, and welding machine speed control is 0.3-0.5m/min; Can guarantee that like this in molten bath, molten metal can permeate weld seam, guarantee weldquality.Above-mentioned welding can adopt the mode of two welding guns to carry out, and in the time of can avoiding adopting single welding gun, because welding speed is compared with affecting slowly normal problem of producing, adopts two welding guns to weld simultaneously, can shorten weld interval.
In the continuous annealing step of above-mentioned thermal annealing acid washing method, adopt 3-6 the annealing furnace that overall length is 75-150m to carry out, it is 1000-1150 ℃ that annealing temperature is controlled, annealing time is controlled is 10-20 minute, makes stainless steel Wide and Thick Slab carry out in the cooling apparatus of 20-30m length cooling after annealing; Processing like this assurance Wide and Thick Slab fully anneals; Target grain size number is in 7-9 level, and Rockwell hardness number HRB is at 80-90.
In ball blast step, velocity of projection is controlled as 1500-2250rpm, and it is that 600-1000kg/min, ball blast granular size are particle diameter 0.5-0.7mm that projection amount is controlled; Can strengthen scale removal ability like this, solve the problem of the more difficult removal of Wide and Thick Slab oxide skin.
In acid pickling step, adopt the nitration mixture being formed by hydrofluoric acid and nitric acid to carry out pickling in 3-6 section groove, wherein, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 80-120g/L; Can strengthen pickling ability like this, improve surface quality.Meanwhile, in order to guarantee abundant pickling, preferably, before pickling with in the middle of pickling, add many group high strength brush rolls to scrub, brush roll is scrubbed rotating speed and is controlled as 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, for supporting through the generous coiled sheet of curling stainless steel.When Wide and Thick Slab is curling, tension force is very large, and the stress occurring when curling is corresponding very large, can cause curling rear loose winding to occur, and adds curling supporting roll, can guarantee curling normal operation.More preferably, above-mentioned supporting roll is arranged on before and after the downside of crimping machine each, supporting roll is can jack-up auxiliary carry out curling.This supporting roll can be telescopic, and when slab operation, jack-up is auxiliary carries out curlingly, can make rolled efficiency obviously improve.
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 can make stainless steel Wide and Thick Slab twist in to avoid as much as possible occurring in Continuous Heat annealing and pickling process, loose winding, surface tear, thus stainless steel Wide and Thick Slab lumber recovery improved.By adopting the generous coiled sheet of stainless steel steel of thermal annealing acid washing method provided by the invention manufacture to there is good surface quality and material capability, improved significantly product lumber recovery.
Accompanying drawing explanation
Weldquality and the curved detection result figure of the stainless steel Wide and Thick Slab that Fig. 1 a and Fig. 1 b provide for embodiment 1;
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 schematic diagram of supporting roll.
Embodiment
For technical characterictic of the present invention, object and beneficial effect being had more clearly, understand, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
Embodiment 1
The 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 comprises the following steps:
Stainless steel Wide and Thick Slab is involved in to 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 as 0.35m/min, and gage of wire is 2.0mm, and initial welded girder groove depth is 1.0mm, use can be polished after wearing and tearing with pit, the most deeply can not surpass 1.5mm; After having welded, confirm weldquality, weldquality is intact, and production line operation enters annealing section;
In annealing furnace, carry out anneal, annealing temperature is controlled as 1125-1130 ℃, and annealing speed is controlled as 5m/min, and the annealing through 18min, completes annealing process, through water-cooled section, thermal zone steel is cooled to 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;
After having annealed, just enter the stage of descaling, first adopt physics dephosphorization equipment descaling mill to process, after the crooked broken skin of descaling mill, enter shot-blasting machine;
In shot-blasting machine, carry out Shot Blasting, wherein, shot-blasting machine velocity of projection is controlled as 2195rpm, and unit time projection amount is controlled as 780kg/min, and ball blast granular size is particle diameter 0.6mm;
After completing Shot Blasting, enter nitration mixture pickling section, wherein, the concentration of hydrofluoric acid is 33g/L, concentration of nitric acid is 105g/L, and it is 60 ℃ that nitration mixture temperature is controlled, during utilize washing device to scrub, guarantee that pickling oxide skin out departs from steel strip surface completely, scrubbing rotating speed is 1200rpm, and scrubbing current control is 260A, completes pickling after 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, front support roller 1 and rear support roller 2 are undertaken curling by band steel 3 jack-up assisting;
Complete the institute of this thermal annealing acid washing method in steps.
Fig. 1 a and Fig. 1 b are the weldquality curved detection result of the stainless steel Wide and Thick Slab after welding.As shown in Figure 1a, welded rear section of weld joint and sheared, weld seam is connected completely with matrix, does not produce pore and gap.Do crooked and tension test detection weldquality, as shown in Figure 1 b, its result does not rupture after 90-degree bent cracking phenomena.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 assurance Wide and Thick Slab can be led to 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 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 the stainless steel Wide and Thick Slab after the method processing providing through embodiment 1.As shown in Figure 3 a and Figure 3 b shows, the surface of the stainless steel Wide and Thick Slab after processing is more smooth evenly, do not have oxide skin and so on to remain in surface, by 100 times of morphology analysis of EPMA, find that surface is more even, each component content is shown as SUS304 matrix composition, surface does not have all the other impurity residual, and de-scaling and pickling can be preferably removals such as oxide skins, and 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 |
By the above results, can find out, the thermal annealing acid washing method providing by employing embodiment 1 is processed stainless steel Wide and Thick Slab afterwards and is had 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 (5)
1. the generous coiled sheet thermal annealing of a stainless steel acid washing method, it comprises the following steps: stainless steel Wide and Thick Slab be involved in a mouthful uncoiling, welding, continuous annealing, scale breading, ball blast, pickling, smooth, export curling, wherein:
In described welding step, welded girder groove depth is controlled at 1.0-1.5mm;
In described continuous annealing step, adopt 3-6 the annealing furnace that overall length is 75-150m to carry out, annealing temperature is controlled as 1000-1150 ℃, annealing time and is controlled as 10-20 minute, makes described stainless steel Wide and Thick Slab twist in to carry out in the long cooling apparatus of 20-30m cooling after annealing;
In described ball blast step, velocity of projection is controlled as 1500-2250rpm, and it is that 600-1000kg/min, ball blast granular size are particle diameter 0.5-0.7mm that projection amount is controlled;
In described acid pickling step, adopt the nitration mixture being formed by hydrofluoric acid and nitric acid to carry out pickling in 3-6 section groove, wherein, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 80-120g/L;
In the curling step of described outlet, add curling supporting roll, for supporting through the generous coiled sheet of curling stainless steel;
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.
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 as 35-40V, 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 many group high strength brush rolls to scrub before pickling with in the middle of pickling, and brush roll is scrubbed rotating speed and controlled as 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, described supporting roll is arranged on before and after the downside of crimping machine each, described supporting roll is can jack-up auxiliary carry out curling.
5. according to the generous coiled sheet thermal annealing of the stainless steel acid washing method described in claim 1-4 any one, 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.
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| 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 |
| 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 |
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| 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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| CN101709477B (en) * | 2009-11-28 | 2011-04-27 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN102773257A (en) * | 2012-07-11 | 2012-11-14 | 中冶南方工程技术有限公司 | Hot-rolled austenitic stainless steel band steel annealing pickling line inlet device and annealing process thereof |
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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 |