What are the thermal expansion differences between stainless steel and cast iron outdoor sofas?

When choosing outdoor furniture, understanding the thermal expansion properties of materials like stainless steel and cast iron is crucial for long-term durability. Stainless steel has a lower thermal expansion coefficient (approximately 16-18 µm/m·°C) compared to cast iron (around 10-12 µm/m·°C), meaning it expands and contracts less under temperature fluctuations. This makes stainless steel more resistant to warping or cracking in extreme heat or cold. Cast iron, while heavier and more rigid, may develop stress cracks over time due to its higher expansion rate. For outdoor sofas exposed to sunlight and weather, stainless steel often offers better stability, whereas cast iron requires careful design to accommodate expansion. Consider these differences to select the best material for your climate and aesthetic preferences.