Method and device for pickling hot-rolled special steel strips

A technology for hot-rolled strips and special steels, applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problems of reducing strip quality and high work costs

Inactive Publication Date: 2003-08-27
SMS DEMAG AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] These known methods are disadvantageous due to the use of shot peening, which increases the surface roughness of the strip and thus reduces the quality of the strip
In addition, work costs are high due to the use of mixed acids, especially hydrofluoric acid

Method used

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  • Method and device for pickling hot-rolled special steel strips
  • Method and device for pickling hot-rolled special steel strips
  • Method and device for pickling hot-rolled special steel strips

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] According to Fig. 1, the hot-rolled strip 1 of special steel is passed from the coil of the inlet section 2 through the welding device 3 (for coil change), an edge trimmer 4 into an inlet looper pick 5 and, if necessary, further A softening annealing furnace 6 ground into the pickling line. The pickling stage 8 and the rinsing stage 9 constitute the pickling operation line 7, and the pickling stage and the rinsing stage will be described in detail below. The hot-rolled strip 1 of special steel emerges from the final rinsing stage 9 and enters an exit looper 10 and the strip ends through an exit shear 11 . During continuous operation, the hot-rolled strip of special steel is recoiled into coils at the export stage.

[0019] According to Fig. 2, in the production of standard steel products, the pickling line 7 works with three pickling tanks and hydrochloric acid in the pickling stage 8, and at the same time, all the flushing stages work with flushing water (No. , 3-6 w...

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Abstract

The invention relates to a method for pickling hot-rolled special steel strips (1) having an austenite, ferrite and / or martensite structure. The inventive method is carried out in a pickling line (7) with pickling sections (8) containing acids and rinsing sections (9) containing rinsing water (15). The aim of the invention is to provide a method that does not require an additional stretch-leveling step for descaling. The costs for pickling are reduced by pickling the hot-rolled special steel strip (1) in the pickling sections (8) with hydrochloric acid (13) and rinsing it in the first rinsing sections (9) with azotic acid (14) or an equivalent substitute pickling medium (14b) and treating it in further rinsing sections (9) with rinsing water (15).

Description

technical field [0001] The invention relates to a pickling method and device for special steel hot-rolled strips with austenite, ferrite and / or martensite structures. The line goes through a pickling phase with acid and a rinsing phase with rinse water. Background technique [0002] When pickling special steel hot-rolled strips (DE19505324C2), this strip is passed through an annealing and pickling line. Before pickling, descaling is carried out, and descaling is carried out in two process stages, namely shot blasting and pickling. During shot peening, the strip surface is mechanically descaled by spraying particles onto the strip surface, which descale due to their kinetic energy. It has been disclosed that in some annealing and pickling lines additionally a stretch leveler is used which on the one hand improves the strip flatness and on the other hand Cracks are formed to make the subsequent chemical pickling process easier. The mechanical pre-descale step is followed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G3/02
CPCC23G1/08
Inventor M·哈恩特杰斯
Owner SMS DEMAG AG
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