In high-traffic areas like sinks or handrails, these marks can accumulate, making the surface look aged or uneven much faster than expected. When the metal reaches specific temperatures, the chromium oxide layer thickens in a predictable pattern, creating a rainbow of hues from gold to deep blue.
Understanding Stainless Steel Rainbow Colors and Heat Discoloration
The answer is yes, because the layer itself can reflect light differently when exposed to heat, chemicals, or physical abrasion, leading to visible color shifts. Physical Abrasion and Wear Patterns Daily handling and contact with abrasive materials cause gradual wear that impacts luster and tone.
Bronze or purple hues appear at intermediate temperatures between 300°C and 400°C. Heat Discoloration and Oxidation One of the most common reasons for color change is heat exposure during welding, cooking, or proximity to high-temperature appliances.
Understanding Stainless Steel Rainbow Colors and Heat Discoloration
Harsh cleaning agents, particularly those containing chlorine or ammonia, can strip the passive layer unevenly. Yellow or gold tints usually occur at lower temperatures around 200°C to 300°C.
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