What kind of stainless steel is not easy to rust?
What kind of stainless steel is not easy to rust?
Apr 15, 2020

There are three main factors that affect the corrosion resistance of stainless steel

  • The content of alloy elements

    Generally speaking, steel with chromium in 10.5% is not easy to rust. The higher proportion of chromium&nickel content, the better the corrosion resistance. For example, stainless steel in grade 304 with 8-10% nickel, and 18-20% chromium, that will not rust under normal circumstances.

  • The manufacturing technique will also affect the corrosion resistance of stainless steel

    The stainless steel plant with good smelting technology, advanced equipment and rolling technology can be in the control of alloy elements, the removal of impurities and the cooling temperature of the billet. Therefore, the product quality is stable and reliable, the internal quality is excellent, and it is not easy to rust. On the contrary, some steel plants are backward in equipment and technology, so impurities cannot be removed during the smelting process, then the products produced will inevitably rust.

  • It is not easy to rust in dry and well environment

    304 stainless steel will rust if the surrounding environment is too bad, such as in the air with high humidity or large pH .

How to deal with stainless steel rust spots?
1. Chemical methods
Pickling paste or spray can assist in re-passivation of its rusted parts to form a chromium oxide film to restore its corrosion resistance. After pickling, in order to remove all contaminants and acid residues, it is very important to properly rinse with water. After everything is processed, we should re-polish with the polishing equipment and finish with polishing wax. For those with slight rust spots, 1: 1 mixture of gasoline and engine oil can be used to wipe off the rust spots .
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2. Mechanical methods
Sand blasting is a way to annihilate, scrub and polish the steel with glass or ceramic particles. It is possible to wipe off the contamination caused by the previously removed materials, polished materials or annihilated materials by mechanical methods. All kinds of pollution, especially iron particles can become a source of corrosion in humid environments. Therefore, mechanical cleaning surfaces should preferably be cleaned regularly under dry conditions. The mechanical method can only clean the surface, and cannot improve the corrosion resistance of the material itself. Therefore, it is recommended to re-polish with polishing equipment after mechanical cleaning and finish with polishing wax.
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