There is only one factor that determines the performance of cold-drawn tubes, and that is chromium. Every stainless steel contains a certain amount of chromium. The fundamental reason why chromium becomes the main element determining the performance of stainless steel is that adding chromium as an alloying element in steel promotes the development of internal contradictory movements, which is beneficial to corrosion damage resistance. In structural steels and tool steels (such as shaped tubes), chromium can significantly increase strength, hardness and wear resistance, but at the same time reduce ductility and toughness. Chromium can also improve the oxidation resistance and corrosion resistance of steel, and is an important alloying element for stainless steel and heat-resistant steel. The role of manganese is not to form austenite, but to reduce the critical quenching rate of steel, increase the stability of austenite during cooling, inhibit the decomposition of austenite, and keep the austenite formed at high temperature at room temperature.
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