CN103820798B - The continuous pickling production method of hot rolling two-phase stainless steel band steel - Google Patents
The continuous pickling production method of hot rolling two-phase stainless steel band steel Download PDFInfo
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Abstract
The present invention discloses a kind of hot rolling two-phase stainless steel band steel continuous pickling production method. Ball de-scaling is thrown after comprising annealing; The pre-pickling of sulfuric acid electrolytic pickling; Grinding is scrubbed; Through sulfuric acid washing groove; Through nitration mixture pickling tank; Again through a nitration mixture pickling tank, in groove, concentration of nitric acid is 100～150g/l, and hydrofluoric acid concentration is 35～55g/l, and concentration of metal ions is 5～20g/l, and acid liquor temperature is 45～65 DEG C, and pickling speed is 10～25m/min. By adjustment shot-blasting machine projection amount and rotating speed, acid cleaning process, acid strength, acid liquor temperature, acid solution composition, can effectively improve strip pickling speed, it is to increase output, and good NO.1 surface can be obtained.
Description
Technical field
The present invention relates to a kind of hot rolling two-phase stainless steel band steel continuous pickling production method, belong to hot-rolled stainless steel annealing and pickling production field.
Technical background
Hot rolling two-phase stainless steel band steel is in hot-rolled process finishing stands, belt steel surface can form one layer of fine and close zone of oxidation, after continuous annealing furnace annealing, oxidated layer thickness can become thick further, after annealed, needing to be removed by belt steel surface major part iron scale with scale breading machine and shot-blasting machine, general stainless steel is if austenitic stainless steel, ferritic stainless steel are after scale breading machine and shot-blasting machine machinery scale breading, and the iron scale of belt steel surface about 90% is removed. But, hot rolling duplex stainless steel oxide skin compactness and stability are stronger, this can cause machinery scale breading time hot rolling duplex stainless steel belt steel surface iron scale destructiveness reduce, mechanical descaling effect is poor, cause pickling section pickling speed very slow, limit output, and after pickling, strip surface quality neither be fine.
At present, the production technique of General N O.1 duplex stainless steel is: taking hot rolling duplex stainless steel as raw material, then annealed+machinery scale breading+sulfuric acid pre-pickling+nitration mixture pickling, it has been improved by patent 200910227930.X, adds catalyst n aCL and H in the pre-Acidwash solution of sulfuric acid2O2, it is disruptive oxidation skin structure that catalyzer mainly acts on, simultaneously, also by increasing sulfuric acid concentration and nitration mixture pickling concentration, increase pickling speed, pickling speed has been brought up to 10��13m/min, but its pickling speed is still relatively slow, and after pickling, strip surface quality can meet NO.1 product requirement. But, it is not fine.
Summary of the invention
In order to overcome the deficiency of above production method, the present invention provides the annealing and pickling production method of a kind of hot rolling two-phase stainless steel band steel, it is possible to improve the pickling speed of hot rolling duplex stainless steel.
The continuous pickling production method of hot rolling two-phase stainless steel band steel, comprises the steps:
(1) throwing ball de-scaling after annealing, shot-blasting machine projection amount is 950��1050kg/min, and shot-blasting machine rotating speed is 2050��2150rpm;
(2) the pre-pickling of sulfuric acid electrolytic pickling, wherein H2SO4Concentration is 250��350g/L, and pickling temperature is 75��85 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 15��35g/L, and size of current is 1000��2000A, and pickling speed is 10��25m/min;
(3) grinding is scrubbed, and motor rotating speed is between 600��1200rpm, and current of electric size is between 310��330A;
(4) through sulfuric acid washing groove, wherein H2SO4Concentration is 220��280g/L, and pickling temperature is 80��90 DEG C, and concentration of metal ions is 40��60g/L, and pickling speed is between 10��25m/min;
(5) through nitration mixture pickling tank, in groove, concentration of nitric acid is 100��150g/L, and hydrofluoric acid concentration is 35��55g/L, and concentration of metal ions is 10��30g/L, and acid liquor temperature is between 45��65 DEG C, and pickling speed is 10��25m/min;
(6) again through a nitration mixture pickling tank, in groove, concentration of nitric acid is 100��150g/L, and hydrofluoric acid concentration is 35��55g/L, and concentration of metal ions is 5��20g/L, and acid liquor temperature is 45��65 DEG C, and pickling speed is 10��25m/min.
By such scheme, step 1) shot-blasting machine projection amount is 975��1025kg/min, and shot-blasting machine rotating speed is 2075��2125rpm.
By such scheme, step 2) sulfuric acid electrolytic pickling H2SO4Concentration is 280��320g/L, and pickling temperature is 78��82 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 20��30g/L, and size of current is 1400��1600A, and pickling speed is 18��22m/min.
By such scheme, it is 900��1100rpm that motor rotating speed is scrubbed in step 3) grinding, and current of electric size is 315��325A.
By such scheme, H in step 4) sulfuric acid washing groove2SO4Concentration is 240��260g/L, and pickling temperature is 83��87 DEG C, and concentration of metal ions is 45��55g/L, and pickling speed is 18��22m/min.
By such scheme, in step 5) nitration mixture pickling tank, concentration of nitric acid is 110��130g/L, and hydrofluoric acid concentration is 40��50g/L, and concentration of metal ions is 15��25g/L, and acid liquor temperature is between 50��60 DEG C, and pickling speed is 10��22m/min.
By such scheme, in step 6) nitration mixture pickling tank, concentration of nitric acid is 110��130g/L, and hydrofluoric acid concentration is 40��50g/L, and concentration of metal ions is 8��12g/L, and acid liquor temperature is 50��60 DEG C, and pickling speed is 10��22m/min.
By such scheme, described two-phase stainless steel band steel steel grade is 2205, and strip steel specification is: width 1350mm, thickness 10mm.
The continuous pickling production method of this hot rolling duplex stainless steel, by adjustment shot-blasting machine projection amount and rotating speed, acid cleaning process, acid strength, acid liquor temperature, acid solution composition, can effectively improve strip pickling speed, it is to increase output, and can obtain good NO.1 surface.
Embodiment
The technical scheme of the present invention is described by the following examples further, but the present invention and be confined to following examples.
Steel grade is 2205, and strip steel specification is: width 1350mm, thickness 10mm.
The pickling production method of hot rolling two-phase stainless steel band steel of the present invention, carries out as follows:
(1) throwing ball de-scaling after annealing, shot-blasting machine projection amount is 950��1050kg/min, and shot-blasting machine rotating speed is 2050��2150rpm.
(2) the band steel pre-pickling of sulfuric acid electrolytic pickling after throwing ball de-scaling, wherein H2SO4Concentration is 250��350g/L, and pickling temperature is 75��85 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 15��35g/L, and size of current is 1000��2000A, and pickling speed is 10��25m/min.
(3) after persulfuric acid electrolytic pickling, then carrying out grinding and scrub, motor rotating speed is between 600��1200rpm, and current of electric size is between 310��330A.
(4) after grinding is scrubbed, band steel is again through sulfuric acid washing groove, wherein a H2SO4Concentration is 220��280g/L, and pickling temperature is 80��90 DEG C, and concentration of metal ions is 40��60g/L, and pickling speed is between 10��25m/min.
(5) after sulfuric acid washing, band steel is again through a nitration mixture pickling tank, and in groove, concentration of nitric acid is 100��150g/L, hydrofluoric acid concentration is 35��55g/L, concentration of metal ions is 10��30g/L, and acid liquor temperature is between 45��65 DEG C, and pickling speed is 10��25m/min.
(6) after nitration mixture pickling, then through a nitration mixture washing trough, in groove, concentration of nitric acid is 100��150g/L, and hydrofluoric acid concentration is 35��55g/L, and concentration of metal ions is 5��20g/L, and acid liquor temperature is 45��65 DEG C, and pickling speed is 10��25m/min.
At present, the pickling of hot rolling duplex stainless steel generally adopts sulfuric acid pre-pickling+nitration mixture acid washing method, and adds catalyst n aCL and H in the pre-pickling of sulfuric acid2O2, NaCL and H2O2, wherein catalyzer H2O2Effect be that the scale structure making stainless steel surface be insoluble in acid solution changes, be transformed into easily by the molten formal similarity of acid solution, it is possible to well strengthen sulfuric acid electrolytic pickling effect. The effect of hydrogen peroxide is: the scale structure making stainless steel surface be insoluble in acid solution changes, and is transformed into easily by the molten formal similarity of acid solution, strengthens pickling effect. When adopting aforesaid method pickled hot duplex stainless steel, pickling section speed is also unhappy, limits output, and after pickling, strip surface quality is not fine.
The present invention can overcome above deficiency, principle as follows described in:
Belt steel surface overwhelming majority oxide skin can be removed by step 1 by shot-blasting machine de-scaling.
Belt steel surface partial oxidation iron sheet, by suitably regulating electrolysis sulfuric acid acid strength, temperature, size of current, can be removed by step 2, and H2O2Under assistance, belt steel surface residue oxide skin can be made to become loose and easily come off; Meanwhile, suitably regulate size of current, acid strength and temperature, can prevent belt steel surface from producing overpickling, it is to increase the smooth finish after belt steel surface pickling. This step does not use NaCL, mainly because NaCL is bigger to electrode corrosion harm.
After step 2, belt steel surface iron scale becomes loose and easily comes off, and step 3 grinding is scrubbed and can effectively be removed belt steel surface partial oxidation skin, reduces pickling section burden, simultaneously, it is possible to reduce belt steel surface roughness.
Belt steel surface overwhelming majority iron scale can be removed by step 4 by high density high-temperature sulfuric acid washing.
Belt steel surface oxide skin, by suitably regulating concentration of nitric acid, hydrofluoric acid concentration, acid liquor temperature, concentration of metal ions, can be removed, and can prevent the generation of overpickling phenomenon by step 5 and step 6 completely, and belt steel surface also can produce one layer of passive film simultaneously.
Technical solution of the present invention has the enforcement mode more optimized as follows:
More optimally, it is 975��1025kg/min that step 1) throws ball de-scaling shot-blasting machine projection amount, and shot-blasting machine rotating speed is 2075��2125rpm.
More optimally, step 2) H in the pre-pickling of electrolytic pickling2SO4Concentration is 280��320g/L, and pickling temperature is 78��82 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 20��30g/L, and size of current is 1400��1600A, and pickling speed is 18��22m/min.
More optimally, it is 900��1100rpm that motor rotating speed is scrubbed in step 3) grinding, and current of electric size is 315��325A.
More optimally, H in step 4) sulfuric acid washing groove2SO4Concentration is 240��260g/L, and pickling temperature is 83��87 DEG C, and concentration of metal ions is 45��55g/L, and pickling speed is 18��22m/min.
More optimally, in step 5) nitration mixture pickling tank, concentration of nitric acid is 110��130g/L, and hydrofluoric acid concentration is 40��50g/L, and concentration of metal ions is 15��25g/L, and acid liquor temperature is between 50��60 DEG C, and pickling speed is 10��22m/min.
More optimally, in step 6) nitration mixture pickling tank, concentration of nitric acid is 110��130g/L, and hydrofluoric acid concentration is 40��50g/L, and concentration of metal ions is 8��12g/L, and acid liquor temperature is 50��60 DEG C, and pickling speed is 10��22m/min.
Embodiment 1
Being undertaken throwing ball de-scaling by the band steel after annealing, shot-blasting machine projection amount is 975kg/min, and shot-blasting machine rotating speed is 2075rpm.
The band steel pre-pickling of sulfuric acid electrolytic pickling after throwing ball de-scaling, wherein H2SO4Concentration is 280g/L, and pickling temperature is 78 DEG C, and concentration of metal ions is 40g/L, and adds catalyzer H in the solution2O2, concentration is 20g/L, and size of current is 1400A, and pickling speed is 18m/min.
After persulfuric acid electrolytic pickling, then carrying out grinding and scrub, motor rotating speed is 900rpm, and current of electric size is 315A.
After grinding is scrubbed, band steel is again through sulfuric acid washing groove, wherein a H2SO4Concentration is 240g/L, and pickling temperature is 83 DEG C, and concentration of metal ions is 45g/L, and pickling speed is 18m/min.
After sulfuric acid washing, band steel is again through a nitration mixture pickling tank, and in groove, concentration of nitric acid is 110g/L, and hydrofluoric acid concentration is 40g/L, and concentration of metal ions is 15g/L, and acid liquor temperature is between 50 DEG C, and pickling speed is 10m/min.
After nitration mixture pickling, then through a nitration mixture washing trough, in groove, concentration of nitric acid is 110g/L, and hydrofluoric acid concentration is 40g/L, and concentration of metal ions is 8g/L, and acid liquor temperature is 50 DEG C, and pickling speed is 10m/min.
Result shows, hot rolling two-phase stainless steel band steel is after overpickling, and belt steel surface does not remain oxide skin, and belt steel surface smooth finish is higher, meets NO.1 surface grade requirement completely.
Embodiment 2
Being undertaken throwing ball de-scaling by the band steel after annealing, shot-blasting machine projection amount is 1025kg/min, and shot-blasting machine rotating speed is 2125rpm.
The band steel pre-pickling of sulfuric acid electrolytic pickling after throwing ball de-scaling, wherein H2SO4Concentration is 320g/L, and pickling temperature is 82 DEG C, and concentration of metal ions is 60g/L, and adds catalyzer H in the solution2O2, concentration is 30g/L, and size of current is 1600A, and pickling speed is 22m/min.
After persulfuric acid electrolytic pickling, then carrying out grinding and scrub, motor rotating speed is 1100rpm, and current of electric size is 325A.
After grinding is scrubbed, band steel is again through sulfuric acid washing groove, wherein a H2SO4Concentration is 260g/L, and pickling temperature is 87 DEG C, and concentration of metal ions is 55g/L, and pickling speed is 22m/min.
After sulfuric acid washing, band steel is again through a nitration mixture pickling tank, and in groove, concentration of nitric acid is 130g/L, and hydrofluoric acid concentration is 50g/L, and concentration of metal ions is 25g/L, and acid liquor temperature is between 60 DEG C, and pickling speed is 22m/min.
After nitration mixture pickling, then through a nitration mixture washing trough, in groove, concentration of nitric acid is 130g/L, and hydrofluoric acid concentration is 50g/L, and concentration of metal ions is 12g/L, and acid liquor temperature is 60 DEG C, and pickling speed is 22m/min.
Result shows, hot rolling two-phase stainless steel band steel is after overpickling, and belt steel surface does not remain oxide skin, and belt steel surface smooth finish is higher, meets NO.1 surface grade requirement completely.
Embodiment 3
Being undertaken throwing ball de-scaling by the band steel after annealing, shot-blasting machine projection amount is 1050kg/min, and shot-blasting machine rotating speed is 2100rpm.
By the band steel sulfuric acid electrolytic pickling pre-treatment after throwing ball de-scaling, wherein H2SO4Concentration is 300g/L, and pickling temperature is 80 DEG C, and concentration of metal ions is 40g/L, and adds catalyzer H in the solution2O2, concentration is 25g/L, and size of current is 1500A, and pickling speed is 20m/min.
After persulfuric acid electrolytic pickling, and then carrying out grinding and scrub, motor rotating speed is 1000rpm, and current of electric size is 319A.
After grinding is scrubbed, band steel is again through sulfuric acid washing groove, wherein a H2SO4Concentration is 250g/L, and pickling temperature is 85 DEG C, and concentration of metal ions is 40g/L, and pickling speed is 20m/min.
After sulfuric acid washing, band steel is again through a nitration mixture pickling tank, and in groove, concentration of nitric acid is 120g/L, and hydrofluoric acid concentration is 45g/L, and concentration of metal ions is 20g/L, and acid liquor temperature is at 60 DEG C, and pickling speed is 20m/min.
After nitration mixture pickling, then through a nitric acid washing trough, in groove, concentration of nitric acid is between 120g/L, and hydrofluoric acid concentration is 45g/L, and concentration of metal ions is 10g/L, and acid liquor temperature is at 60 DEG C, and pickling speed is 20m/min.
Result shows, hot rolling two-phase stainless steel band steel is after overpickling, and belt steel surface does not remain oxide skin, and belt steel surface smooth finish is higher, meets NO.1 surface grade requirement completely.
Claims (7)
1. the continuous pickling production method of hot rolling two-phase stainless steel band steel, it is characterised in that comprise the steps:
(1) throwing ball de-scaling after annealing, shot-blasting machine projection amount is 975��1025kg/min, and shot-blasting machine rotating speed is 2075��2125rpm;
(2) the pre-pickling of sulfuric acid electrolytic pickling, wherein H2SO4Concentration is 250��350g/L, and pickling temperature is 75��85 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 15��35g/L, and size of current is 1000��2000A, and pickling speed is 10��25m/min;
(3) grinding is scrubbed, and motor rotating speed is between 600��1200rpm, and current of electric size is between 310��330A;
(4) through sulfuric acid washing groove, wherein H2SO4Concentration is 220��280g/L, and pickling temperature is 80��90 DEG C, and concentration of metal ions is 40��60g/L, and pickling speed is between 10��25m/min;
(5) through nitration mixture pickling tank, in groove, concentration of nitric acid is 100��150g/L, and hydrofluoric acid concentration is 35��55g/L, and concentration of metal ions is 10��30g/L, and acid liquor temperature is between 45��65 DEG C, and pickling speed is 10��25m/min;
(6) again through a nitration mixture pickling tank, in groove, concentration of nitric acid is 100��150g/L, and hydrofluoric acid concentration is 35��55g/L, and concentration of metal ions is 5��20g/L, and acid liquor temperature is 45��65 DEG C, and pickling speed is 10��25m/min.
2. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterised in that step 2) sulfuric acid electrolytic pickling H2SO4Concentration is 280��320g/L, and pickling temperature is 78��82 DEG C, and concentration of metal ions is 40��60g/L, and adds catalyzer H in the solution2O2, concentration is 20��30g/L, and size of current is 1400��1600A, and pickling speed is 18��22m/min.
3. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterised in that step 3) to scrub motor rotating speed be 900��1100rpm in grinding, current of electric size is 315��325A.
4. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterised in that step 4) H in sulfuric acid washing groove2SO4Concentration is 240��260g/L, and pickling temperature is 83��87 DEG C, and concentration of metal ions is 45��55g/L, and pickling speed is 18��22m/min.
5. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterized in that step 5) concentration of nitric acid is 110��130g/L in nitration mixture pickling tank, hydrofluoric acid concentration is 40��50g/L, concentration of metal ions is 15��25g/L, acid liquor temperature is between 50��60 DEG C, and pickling speed is 10��22m/min.
6. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterized in that step 6) concentration of nitric acid is 110��130g/L in nitration mixture pickling tank, hydrofluoric acid concentration is 40��50g/L, concentration of metal ions is 8��12g/L, acid liquor temperature is 50��60 DEG C, and pickling speed is 10��22m/min.
7. the continuous pickling production method of hot rolling two-phase stainless steel band steel as claimed in claim 1, it is characterised in that described two-phase stainless steel band steel steel grade is 2205, and strip steel specification is: width 1350mm, thickness 10mm.
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