The lifespan of Q345b rectangular pipes varies based on technical specifications and can range from one to several years. Factors influencing the lifespan of rectangular pipes include technology, application, and composition, all of which can impact the lifespan. Under non-application conditions, that is, when not in use, the lifespan is primarily determined by the structure, with some influence from technology. Today, let's discuss the composition and constituent elements of Q345b rectangular pipes, which have a significant impact on their lifespan. What elements affect the lifespan? We list several factors below:

Carbon: The higher the carbon content, the greater the strength of the steel, but the poorer its ductility and malleability.

(2) Sulfur is a harmful impurity in steel. Steel with high sulfur content is prone to cracking during high-temperature, pressure-based production and processing, commonly referred to as hot shortness.

(3) Phosphorus can significantly reduce the ductility and elongation of steel, especially at low temperatures, a condition known as cold ductility. In heat-resistant cast iron, both sulfur and phosphorus must be strictly controlled.

But from another perspective, a higher sulfur and phosphorus content in high-carbon steel can make it prone to breakage during drilling, which is beneficial for improving the steel's drillability.

(4) Manganese-enriched ferritic stainless steel (medium carbon steel) significantly enhances the tensile strength of steel, mitigates and eliminates the adverse effects of sulfur, and improves the steel's cutting properties. It boasts excellent wear resistance and other processing characteristics.

(5) Silicon can enhance the hardness of steel, but it reduces its ductility and malleability. Steel used by welders containing a certain amount of silicon can improve the soft magnetic properties.

(6) Enhances the steel's red hardness and thermal strength, as well as its wear resistance.

(7) Chromium enhances steel's cutting performance and wear resistance, improving its corrosion resistance and antioxidant capabilities.