A process according to claim 1, additionally comprising adjusting the redox potential by taking one or more of the following actions: a) adding a reagent to the pickling solution which is able to oxidize Fe(II) ions in the pickling solution to Fe(III) ions b) catalytically oxidizing the pickling solution with an oxygen-containing gas using a homogeneous or heterogeneous oxidation catalyst c) electrochemically oxidizing the pickling solution.ħ. with a platinum electrode and relative to an Ag/AgCl reference electrode, of 150 to 235 mV.Ħ. A process according to claim 1, wherein the pickling solution has a redox potential, measured at 25° C.

with a platinum electrode and relative to an Ag/AgCl reference electrode, of 100 to 240 mV.ĥ. A process according to claim 1, wherein the pickling solution comprises 10 to 25 g/l of Fe(III) ions.Ĥ. A process according to claim 1, wherein the pickling solution comprises 55 to 75 g/l of free sulfuric acid.ģ. A process for pickling martensitic or ferritic stainless steel, said process comprising contacting the stainless steel with a pickling solution comprising 5 to 40 g/l of Fe(III) ions, 50 to 120 g/l of free sulfuric acid and 5 to 40 g/l of free HF at a temperature in the range 15 to 29° C.Ģ. Rare earth magnet and method for manufacturing the sameġ. Magnetic substance with maximum complex permeability.īIMETALLIC DOCTOR BLADE WITH WORKING EDGE PRODUCED BY POWDER METALLURGY Heat Treatment Process for Engine Ring Gear Method and device for cooling hot-rolled profiled sectionsĬOMPOSITION FOR CHEMICAL CONVERSION TREATMENT, AND PROCESS FOR PRODUCING A MEMBER HAVING AN ANTICORROSIVE FILM FORMED FROM THE COMPOSITION Steel pipe for high strength line pipe superior in strain aging resistance and steel plate for high strength line pipe and methods of production of the same

Ni-BASED COMPOUND SUPERALLOY HAVING EXCELLENT OXIDATION RESISTANCE, METHOD FOR MANUFACTURING THE SAME, AND HEAT-RESISTANT STRUCTURAL MATERIAL

Acid pickling of martensitic steel