Process for pickling martensitic or ferritic stainless steel

Details Process for pickling martensitic or ferritic stainless steel Process for pickling martensitic or ferritic stainless steel

2007-06-12

2007-06-12

Carrillo, Sharidan (Department: 1746)

Cleaning and liquid contact with solids

Processes

Metal base work, acid treating

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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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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