QN is an abbreviation for Quality Number, which refers to the grade, mark or quality code of stainless steel. According to information from Mysteel.com, in 2018, China's Tsingtuo Group invented QN1803, a high-nitrogen, high-corrosion-resistant austenitic stainless steel, and Tsingtuo was the first company in the world to invent the product. At present, this series of products has developed five major varieties such as QN1701, QN1803, QN1804, QN1906 and QN2109, which covers 15-30 pitting resistance equivalent number and they can replace American Standard 201/430, 304, 304L, 316L and 317L. QN stainless steel has the characteristics of high corrosion resistance, high strength, high wear resistance, easy processing and easy welding. At the same time, Tsingtuo Group reduces the alloy cost of the product and enhances the technical added value of the product through the new technology of replacing nickel with nitrogen. This makes the series of QN stainless steel products with super high cost performance advantage.

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