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Stainless steel pipes are a cost-effective type of sectional steel and represent an important product in the steel industry. They can be widely used in both domestic decoration and industrial applications; many people use them to manufacture stair handrails, window guards, railings, furniture, and more. Their usage is very widespread. Here is a brief overview of the surface treatment processes for stainless steel pipes: 1. After hot rolling, annealing, pickling, and descaling, the surface of the stainless steel sheet becomes dull and somewhat rough. 2. This version has a better surface finish than the previous one – it remains dull – but it goes through cold rolling, annealing, descaling, and is then lightly rolled using textured rollers. 3. This is the most commonly used method in construction applications. Apart from the final light cold rolling with polishing rollers after annealing and descaling, the other processes are the same as those used in method 2. The surface is slightly shiny and can be polished further. 4. Bright annealing: (1) This results in a reflective surface, achieved through rolling with polishing rollers followed by final annealing in a controlled atmosphere. (2) Bright annealing preserves the reflective surface without the formation of oxide scale. Introduction: As a type of special steel product with high added value, stainless steel is being used in an increasingly wide range of applications, both in civilian fields such as decoration, kitchenware, and home appliances ； It is also widely used in industrial fields such as petrochemicals and mechanical equipment; currently, the market prospects for high-quality stainless steel products remain favorable. Next, let’s take a look at the functions of the main elements required for producing stainless steel: 1. Nickel: This is the most important element in nickel-based stainless steels; it enhances the strength and toughness of the steel as well as its hardenability. At high concentrations, it can significantly alter certain physical properties of the steel and alloys, thereby improving their corrosion resistance. 2 Manganese: It can increase the strength of steel, reduce and eliminate the adverse effects of sulfur, and enhance the hardenability of steel. High-alloy steels with high manganese content (manganese steels) possess excellent wear resistance as well as other physical properties. 3 Chromium: It can enhance the hardenability and wear resistance of steel, as well as improve its corrosion resistance and oxidation resistance. 4 Vanadium: It can refine the grain structure of steel, thereby increasing its strength, toughness, and wear resistance. When it melts into austenite at high temperatures, it can increase the hardenability of steel ； Conversely, when it exists in the form of carbides, it reduces its hardenability. 5 Molybdenum: It can significantly improve the hardenability and heat strength of steel, prevent temper brittleness, and increase residual magnetism and coercivity. 6 Titanium: It can refine the grain structure of steel, thereby improving its strength and toughness. In stainless steel, titanium can eliminate or reduce intergranular corrosion in the steel. 7 Copper: Its main function is to improve the resistance of ordinary low-alloy steels to atmospheric corrosion, and this effect is more pronounced when used in combination with phosphorus.