A hot pickling production process for stainless steel

Abstract

The invention provides a hot acid pickling production process of stainless steel. The hot acid pickling production process comprises the following steps of (1) uncoiling, wherein uncoilers are adoptedfor uncoiling a steel coil raw material; (2) cutting, wherein hydraulic scissors are adopted for shearing off unqualified steel strips; (3) welding, wherein a laser welding machine is adopted for welding the heads and the tails of steel strips obtained through shearing; (4) rolling, wherein the steel strips enter three rolling machines to be continuously rolled; (5) degreasing, wherein degreasingequipment is adopted for removing surface rolling oil and oxidized scales for the rolled steel strips; (6) annealing, wherein the steel strips enter an annealing furnace for annealing from a middle loop; (7), scale removal, wherein a scale breaker is adopted for carrying out scale removal on the annealed steel strips; (8) grinding and cleaning, wherein grinding and cleaning equipment is adopted for grinding and cleaning the steel strips obtained after scale removal; (9) electrolysis, wherein the ground and cleaned steel strips enter an electrolytic area to be electrolyzed; (10) acid pickling,wherein the electrolyzed steel strips enter an acid pickling area for acid pickling; and (11) coiling, wherein the steel strips obtained after acid pickling are coiled through a coiling machine. According to the hot acid pickling production process, the acid amount is reduced, environment pollution is relieved, and the product surface is smooth and full of gloss.

Description

technical field [0001] The invention relates to the processing field of stainless steel, in particular to a hot pickling production process of stainless steel. Background technique [0002] The traditional production process of black steel strip is as follows: [0003] Hot-rolled black steel coil → continuous rolling → annealing and pickling → 2E finished product [0004] The traditional white steel strip production process is divided into the following two types: [0005] 1) The production process of medium and heavy plate (thickness>0.90mm) is as follows: [0006] Hot-rolled black steel coil → continuous rolling → annealing and pickling (removal of phosphorus) → continuous rolling again → annealing and pickling (removal of phosphorus) → 2B finished product [0007] 2) The production process of thin plate (thickness <0.90mm) is as follows: [0008] Hot-rolled black steel coil → annealing and pickling (phosphorus removal) → cold rolling mill reciprocating rolling →...

AI Technical Summary

Problems solved by technology

[0010] The above-mentioned stainless steel production process can produce two kinds of steel strips, namely: black-skinned steel strips and white-skinned steel strips, wherein, when the black-skinned steel strips are produced, phosphorus removal treatment is not required, and the black-skinned steel strips are not dephosphorized. Phosphorus, the surface of the steel strip is dull, gray-black, and pickling directly after continuous rolling, the surface of the steel strip is rough; when the white steel strip is produced, the phosphorus is removed after annealing to make the surface of the steel strip as shiny as a mirror; but , due to the use of shot blasting machine to remove the scale on the surface of the steel strip and pickling directly after phosphorus removal; the surface of the product produced in this way is rough and cannot meet the customer's requirements

In addition, both the traditional black steel strip and the white steel strip need to use a large amount of acid for pickling to remove the scale on the surface of the steel strip, resulting in aggravated environmental pollution; in addition, the traditional black steel strip The production of white steel strips requires two production lines, which has high investment costs and is not environmentally friendly.

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