CN105154900A - High-chromium austenitic stainless steel surface acid pickling method - Google Patents
High-chromium austenitic stainless steel surface acid pickling method Download PDFInfo
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- CN105154900A CN105154900A CN201510619796.3A CN201510619796A CN105154900A CN 105154900 A CN105154900 A CN 105154900A CN 201510619796 A CN201510619796 A CN 201510619796A CN 105154900 A CN105154900 A CN 105154900A
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Abstract
The invention belongs to the technical field of stainless steel acid pickling and particularly relates to a high-chromium austenitic stainless steel surface acid pickling method. The method includes the following steps that two strips of stainless steel containing Ni or double-phase stainless steel rolls are connected to the front end and the rear end respectively before acid pickling; the annealed stainless steel passes through a 1# electrolytic cell of the neutral salt electrolysis segment; the annealed stainless steel passes through a 2# electrolytic cell, and oxide skin of the high-chromium austenitic stainless steel is removed through a proper electrolysis process and acid pickling process; the surfaces of the steel rolls are bight compared with the surface of a steel roll treated through an existing stainless steel acid pickling method, the glossiness is high, and the use requirement of a 2D plate in GB3280 is met.
Description
Technical field
The invention belongs to acid-washing stainless steel technical field, be specifically related to the method for a kind of high-chromium austenite stainless steel surface pickling.
Background technology
Due to the singularity of high-chromium austenite stainless steel composition and tissue, high-chromium austenite stainless steel is compared with other stainless steels, chromated oxide content in internal layer oxide skin will far above other stainless steel, and alloying element contained in zone of oxidation is more, and its structure type forming oxide compound is also more complicated.This otherness of oxide skin is the basic reason causing its pickling difficulty or ease.The stainless passive state less stable of this type, very easily produces localized attack and causes overpickling in acid cleaning process simultaneously, and this also becomes the important factor of such steel grade pickling rear surface increased quality of restriction.When using the continuous lines rolling acid cleaning process before improving, in order to obtain the coil of strip of better surface quality, continuous lines speed is comparatively slow, but the mistake linear velocity of continuous lines to coil of strip has requirement, speed is excessively slow, coil of strip will stop in the lehr for a long time, easy burning, after the most jogging speed pickling allowed with technique, coil of strip surface blackening, color and luster is poor, and belt steel surface has produced the surface irregularity that overpickling causes, does not reach the requirement of use.
Summary of the invention
Object of the present invention is exactly the method for a kind of high-chromium austenite stainless-steel roll continuous pickling that pickling coil of strip surface quality will be provided to meet service requirements.
The present invention is achieved through the following technical solutions:
A method for high-chromium austenite stainless steel surface pickling, the method is carried out according to following step:
(1) the high-chromium austenite coil of strip front-end and back-end before pickling after cold rolled annealed connect containing Ni stainless steel or double-phase stainless steel coil;
(2) by the 1# electrolyzer of the stainless steel after annealing by neutral salt electrolysis section, the medium of 1# electrolyzer is Na
2sO
4solution, proportion 1.15 ~ 1.20g/cm
3, electrolyte temperature 65 ~ 75 DEG C, pH value is 3 ~ 5, Faradaic current 0 ~ 2A/dm
2, electrolytic speed is 10m/min ~ 30m/min;
(3) stainless steel after annealing is passed through 2# electrolyzer, the medium of 2# electrolyzer is Na
2sO
4solution, proportion 1.15 ~ 1.20g/cm
3, electrolyte temperature 65 ~ 75 DEG C, pH value is 3 ~ 5, Faradaic current 0 ~ 2A/dm
2, electrolytic speed 10m/min ~ 30m/min;
(4) stainless-steel roll is passed through 1# scrubbing unit, main purpose is that the band steel after the electrolysis of centering salt is scrubbed, and remains with the neutral salt removing belt steel surface;
(5) stainless steel is passed through 1# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 45 ~ 55 DEG C, HNO
3concentration is 140 ~ 170g/l, HF concentration is 35 ~ 60g/l, and iron concentration is less than 30g/l, pickling speed 10m/min ~ 30m/min;
(6) stainless steel is passed through 2# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 45 ~ 55 DEG C, HNO
3concentration is 140 ~ 170g/l, HF concentration is 35 ~ 60g/l, and iron concentration is less than 30g/l, pickling speed 10m/min ~ 30m/min;
(7) coil of strip is passed through 1# tank, medium is water, and temperature is 45 ~ 60 DEG C, crosses linear velocity 10m/min ~ 30m/min;
(8) coil of strip is passed through 2# tank, medium is water, and temperature is 45 ~ 60 DEG C, crosses linear velocity 10m/min ~ 30m/min;
(9) that cuts away high-chromium austenite stainless steel front-end and back-end contains Ni stainless steel or double-phase stainless steel coil.
Compared with prior art, beneficial effect of the present invention is:
The present invention, by using suitable electrolysis process and acid cleaning process, eliminates the stainless oxide skin of high-chromium austenite, and coil of strip surface comparatively uses the coil of strip surface of existing acid-washing stainless steel method bright, and glossiness is high, reaches the service requirements of 2D plate in GB3280.
Embodiment
Below the present invention is described further.
Embodiment
The present embodiment pickling be 1.0mm cold rolled annealed after 06Cr25Ni20 austenite stainless coil of strip, it is following step successively:
(1) the 06Cr25Ni20 austenite stainless coil of strip front-end and back-end before pickling after cold rolled annealed respectively connect the 022Cr23Ni5Mo3N double-phase stainless steel coil of a volume 1500m appearance stack pile;
(2) by the 1# electrolyzer of the stainless steel after annealing by neutral salt electrolysis section, the medium of 1# electrolyzer is Na
2sO
4solution, proportion 1.18g/cm
3, electrolyte temperature 72
oc, pH value is 3.8, Faradaic current 1A/dm
2, electrolytic speed is 20m/min;
(3) stainless steel after annealing is passed through 2# electrolyzer, the medium of 2# electrolyzer is Na
2sO
4solution, proportion 1.8g/cm
3, electrolyte temperature 72
oc, pH value is 3.8, Faradaic current 1A/dm
2, electrolytic speed 20m/min;
(4) stainless-steel roll is passed through 1# scrubbing unit, belt steel surface is scrubbed;
(5) then stainless steel is passed through 1# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 48
oc, HNO
3concentration is 150g/l, HF concentration is 40g/l, and iron concentration is 10g/l, pickling speed 20m/min;
(6) then stainless steel is passed through 2# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 48
oc, HNO
3concentration is 150g/l, HF concentration is 40g/l, and iron concentration is 10g/l, pickling speed 20m/min;
(7) then coil of strip is passed through 1# tank, medium is water, and temperature is 55
oc, crosses linear velocity 20m/min;
(8) then coil of strip is passed through 2# tank, medium is water, and temperature is 55
oc, crosses linear velocity 20m/min;
(9) double-phase stainless steel coil of high-chromium austenite stainless steel front-end and back-end is cut away.
The double-phase stainless steel coil welded in step (1) also can replace with other high-chromium austenite stainless-steel rolls.
In above-mentioned working process, described pickling speed, electrolytic speed, namely punishment in advance speed be with steel in pickling, lengthwise travel rate during electrolysis.
Wherein, the double-phase stainless steel coil welded in step (1) is the normal coil of strip produced, and must pass through pickling tank when producing, length is generally 1000m to 1500m, and thickness is 1mm to 3mm.Continuous lines is ceaselessly operating, and dispel because the stainless oxide skin of high-chromium austenite is more difficult, pickling speed can not be too fast, so easy overpickling during common stainless steel pickling, surface quality does not reach requirement, and the oxide skin of duplex stainless steel own is also more difficult dispels, and speed is comparatively slow also can not overpickling.Continuous pickling line afterbody has special shears and reeling machine, the excision of the stainless-steel roll of high-chromium austenite stainless steel front-end and back-end can be batched.
Coil of strip glossiness after the present embodiment pickling is high, and surface is without overpickling phenomenon, reaches the service requirements of 2D plate, and after uncoiling stripping and slicing, alternative spiral-plate uses, and also can be used as the stock roll that 2B produces simultaneously.
Claims (1)
1. a method for high-chromium austenite stainless steel surface pickling, is characterized in that: the method is carried out according to following step:
(1) the high-chromium austenite coil of strip front-end and back-end before pickling after cold rolled annealed connect containing Ni stainless steel or double-phase stainless steel coil;
(2) by the 1# electrolyzer of the stainless steel after annealing by neutral salt electrolysis section, the medium of 1# electrolyzer is Na
2sO
4solution, proportion 1.15 ~ 1.20g/cm
3, electrolyte temperature 65 ~ 75 DEG C, pH value is 3 ~ 5, Faradaic current 0 ~ 2A/dm
2, electrolytic speed is 10m/min ~ 30m/min;
(3) stainless steel after annealing is passed through 2# electrolyzer, the medium of 2# electrolyzer is Na
2sO
4solution, proportion 1.15 ~ 1.20g/cm
3, electrolyte temperature 65 ~ 75 DEG C, pH value is 3 ~ 5, Faradaic current 0 ~ 2A/dm
2, electrolytic speed 10m/min ~ 30m/min;
(4) stainless-steel roll is passed through 1# scrubbing unit, main purpose is that the band steel after the electrolysis of centering salt is scrubbed, and remains with the neutral salt removing belt steel surface;
(5) stainless steel is passed through 1# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 45 ~ 55 DEG C, HNO
3concentration is 140 ~ 170g/l, HF concentration is 35 ~ 60g/l, and iron concentration is less than 30g/l, pickling speed 10m/min ~ 30m/min;
(6) stainless steel is passed through 2# chemical mixing pickling section, medium is HNO
3+ HF, temperature is 45 ~ 55 DEG C, HNO
3concentration is 140 ~ 170g/l, HF concentration is 35 ~ 60g/l, and iron concentration is less than 30g/l, pickling speed 10m/min ~ 30m/min;
(7) coil of strip is passed through 1# tank, medium is water, and temperature is 45 ~ 60 DEG C, crosses linear velocity 10m/min ~ 30m/min;
(8) coil of strip is passed through 2# tank, medium is water, and temperature is 45 ~ 60 DEG C, crosses linear velocity 10m/min ~ 30m/min;
(9) that cuts away high-chromium austenite stainless steel front-end and back-end contains Ni stainless steel or double-phase stainless steel coil.
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| CN201510619796.3A CN105154900B (en) | 2015-09-25 | 2015-09-25 | A kind of method of high-chromium austenite stainless steel surface pickling |
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| CN201510619796.3A CN105154900B (en) | 2015-09-25 | 2015-09-25 | A kind of method of high-chromium austenite stainless steel surface pickling |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506725A (en) * | 2015-12-17 | 2016-04-20 | 天津市富仁板带有限公司 | Steel strip degreasing process |
| CN109594086A (en) * | 2018-12-29 | 2019-04-09 | 佛山市诚德新材料有限公司 | A kind of pickler of stainless steel band |
| CN109628944A (en) * | 2018-12-29 | 2019-04-16 | 佛山市诚德新材料有限公司 | A kind of annealing and pickling system of stainless steel band |
| CN114086188A (en) * | 2021-10-18 | 2022-02-25 | 山西太钢不锈钢股份有限公司 | Method for improving pickling effect of stainless steel of wide and thick cold plate |
| CN115094506A (en) * | 2022-06-13 | 2022-09-23 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled coil |
| CN115261565A (en) * | 2022-06-29 | 2022-11-01 | 河钢股份有限公司 | Heat treatment method suitable for 35MnB steel wear-resistant part |
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| CN101165223A (en) * | 2007-08-15 | 2008-04-23 | 山西太钢不锈钢股份有限公司 | Acid pickling method for stainless steel surface |
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN102899672A (en) * | 2012-09-12 | 2013-01-30 | 山西太钢不锈钢股份有限公司 | Continuous pickling method for super austenitic stainless steel coil |
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2015
- 2015-09-25 CN CN201510619796.3A patent/CN105154900B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165223A (en) * | 2007-08-15 | 2008-04-23 | 山西太钢不锈钢股份有限公司 | Acid pickling method for stainless steel surface |
| CN101709477A (en) * | 2009-11-28 | 2010-05-19 | 山西太钢不锈钢股份有限公司 | Method for continuous pickling of double-phase stainless steel coil |
| CN102899672A (en) * | 2012-09-12 | 2013-01-30 | 山西太钢不锈钢股份有限公司 | Continuous pickling method for super austenitic stainless steel coil |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105506725A (en) * | 2015-12-17 | 2016-04-20 | 天津市富仁板带有限公司 | Steel strip degreasing process |
| CN105506725B (en) * | 2015-12-17 | 2018-05-25 | 天津市富仁板带有限公司 | A kind of steel tape degreasing technique |
| CN109594086A (en) * | 2018-12-29 | 2019-04-09 | 佛山市诚德新材料有限公司 | A kind of pickler of stainless steel band |
| CN109628944A (en) * | 2018-12-29 | 2019-04-16 | 佛山市诚德新材料有限公司 | A kind of annealing and pickling system of stainless steel band |
| CN114086188A (en) * | 2021-10-18 | 2022-02-25 | 山西太钢不锈钢股份有限公司 | Method for improving pickling effect of stainless steel of wide and thick cold plate |
| CN115094506A (en) * | 2022-06-13 | 2022-09-23 | 山西太钢不锈钢股份有限公司 | Method for improving surface quality of cold-rolled coil |
| CN115261565A (en) * | 2022-06-29 | 2022-11-01 | 河钢股份有限公司 | Heat treatment method suitable for 35MnB steel wear-resistant part |
| CN115261565B (en) * | 2022-06-29 | 2023-11-21 | 河钢股份有限公司 | Heat treatment method suitable for 35MnB steel wear-resistant piece |
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