Stainless steel production process pickling passivating basic process

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1. After cutting the cleaning and pickling passivationbearings high speed
Stainless steel workpiece after the cutting surface usually residu al scrap iron and steel end and cooling emulsion and dirt, can make the stainless steel surface appeared blotch and rust, so should be skimmed oil removal, garnish with nitric acid cleaning, already removed the iron steel end, and carried on the passivation.
2. Before and after welding of cleaning and pickling passivation
Because oil is the source of hydrogen, without clear grease weld will formation pressure, and low melting point metal pollution (such as zinc rich paint) after welding can cause craze, so stainless steel welding is required before will groove on both sides and 20 mm in clean surface, oil available acetone scrub, paint rust shall first use cloth or stainless steel wire brush to clean, reoccupy acetone rub-up.industrial bearings
Stainless steel equipment manufacturing whatever the welding technology, after all to clean, all welding slag, splash content, stain and oxidation co lor are trying to get rid of, clear the methods including mechanical cleaning and chemical cleaning. Mechanical cleaning have grinding, polishing and sand peening etc, should avoid to use carbon steel brush, in case surface rust. To get the best corrosion resistance, but will the soaked in HNO3 and HF mix liquid, or use the pickling passivation paste. In fact often 4 californium 1 machinery cleaning and chemical cleaning are combined to use.
3. A superior cleaning
The superior and hot work after the stainless steel workpiece, the surface often have a layer of scale, lubricant or oxide pollution, pollutants including graphite, molybdenum disulfide and carbon dioxide, etc. Should be through the peening processing, salt bath treatment and multichannel pickling treatment. Such as the United States stainless steel turbine blade process for:
Salt bath (10 min) - water quench (2.5 min) - sulfuric acid wash (2 min) to wash it in cold water (2 min) - basic permanganate salt bath (10 min) to wash it in cold water (2 min) - sulfuric acid wash (1 rain) to wash it in cold water (1 min), nitric acid wash (1.5 min) to wash it in cold water (1 min) - hot wash (1 min) and the air is dry.china bearing manufacturer