Stainless steel is generally used in chemical production and daily life. The advantage of stainless steel is corrosion resistance. The corrosion resistance of stainless steel depends on chromium, but because chromium is one of the components of steel, the protection methods are different. When the addition of chromium reaches 10.5%, the corrosion performance of steel will increase significantly, but the chromium content will be higher. Although it can improve the corrosion resistance, the effect is not obvious. The specific reason is that when chromium alloys steel, it changes the type of surface oxide to a surface oxide similar to that formed on pure chromium metal. This tightly adhered chromium-rich oxide protects the surface and prevents further oxidation. This oxide layer is extremely thin, and the natural luster of the steel surface can be seen through it, giving the stainless steel a unique surface. Moreover, if the surface layer is damaged, the exposed steel surface will react with the atmosphere to repair itself, re-form the passivation film, and continue to play a protective role. Therefore, all stainless steels have a common feature, that is, the chromium content is above 10.5%.
The stainless steel composite pipe of the current road anti-collision guardrail is one of the more materials to choose. The stainless steel composite pipe material is covered with thin-walled stainless steel in the steel pipe, which reduces the manufacturing cost and ensures the thickness and strength, so that the installation cost is much lower than that of the stainless steel pipe. At the same time, it has good mechanical properties, good acid and alkali and corrosion resistance. Because it is a composite process, it has high strength, cold and heat resistance, simple and fast installation, and high safety. Stainless steel composite pipes are widely used in the use of road anti-collision guardrails, bridge guardrails, and highway guardrails.