🔥 Inside the Boiler – Stainless Steel Heat Treatment 🔥 In this video, our heat treatment technicians are performing normalizing (also known as hardening) on 6-inch stainless steel tubes inside a boiler. At this stage, the metal reaches over 900°C, and the technicians hold the temperature for about two hours to refine the grain structure and improve mechanical properties. After that, you’ll see them removing the insulation and heaters while the metal still glows like fire – that’s because the r