Process for pickling martensitic or ferritic stainless steel

Cleaning and liquid contact with solids – Processes – Metal base work – acid treating

Reexamination Certificate

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C510S258000, C510S260000, C134S002000, C134S003000, C134S026000, C134S027000, C134S028000, C134S029000, C134S030000, C134S032000, C134S034000, C134S035000, C134S036000, C134S042000

Reexamination Certificate

active

10860911

ABSTRACT:
A process for pickling martensitic or ferritic stainless steel, preferably in the form of wires, tubes or rods, wherein the stainless steel is placed in contact with a pickling solution which has a temperature in the range 15 to 29° C. and contains 50 to 120 g/l of free sulfuric acid, 5 to 40 g/l of free HF and 5 to 40 g/l of Fe(III) ions. Such pickling may be incorporated into a sequential process, wherein the stainless steel is a) subjected to a treatment during which the oxidic coating is applied, preferably sand-blasting or metal-blasting, treatment with a molten salt or treatment with an aqueous permanganate/alkali metal hydroxide solution, b) pickled in accordance with the aforedescribed process, and c) post-treated with a passivating solution.

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Ullmanns Encyklopadie der technischen Chemie, 4thEdition, vol. 22, pp. 102-112.
Stainless steels; technical delivery conditions for plates, hot rolled strip, wire rods, drawn w bars, forgings and semi-finished product, DIN 17 440, pp. 1-26 (1985).

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