The invention and use of stainless steel can be traced back to the First World War. Henry buhrer, a British scientist, was commissioned by the British military arsenal to study the improvement of weapons. At that time, the rifle bore used by soldiers was very easy to wear, and buhrer wanted to invent an alloy steel that was not easy to wear.
ferritic stainless steel
Chromium 15% ~ 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its chloride stress corrosion resistance is better than other types of stainless steel, including Crl7, Cr 17Mo2Ti, Cr25, Cr25Mo3Ti and Cr28. Ferritic stainless steel has good corrosion resistance and oxidation resistance because of its high chromium content.
However, the mechanical properties and technological properties are poor, and they are mostly used in acid-resistant structures with less stress and as oxidation-resistant steels. This kind of steel can resist the corrosion of atmosphere, nitric acid and brine solution, and has the characteristics of good oxidation resistance at high temperature and small thermal expansion coefficient. It can be used in nitric acid and food factory equipment, and can also be used to manufacture parts that work at high temperature, such as gas turbine parts.