The color engraving is possible on oxygen hungry materials such as: titan; stainless steel; zirconium; aluminum; nickel; brass; silver. Heat Colors. CAST STEEL MELTS 2600 TO 2750 F. MILD STEEL MELTS AT 2690 F. WROUGHT IRON MELTS 2700 TO 2750 F. PURE IRON MELTS AT 2768 F. CHROMIUM MELTS AT 2750 -3034 F. STAINLESS STEEL MELTS AT 2550 F; Click here to see an accurate color chart at Roman Kral’s Amateur Blacksmith Site. PERCEIVED COLORS DEPEND ON LIGHTING. due to excessive heat or too rapid heating. My name is Bill Worden. The corrosion damage near the welded joint in the boiler of AISI 304L stainless steel was analysed. I had my first exposure to metal-finishing when I was 14 yrs. Back to “How To” Page RE: Heat Tint On Duplex Stainless Steel stanweld (Materials) 27 Jul 05 13:12 Pitting corrosion failures have been seen to initiate in locations of yellow to brown heat tinting on the ID surface weld metal and HAZ in 2205. I am the founder & owner of STEEL F/X® Patinas, which began officially in the fall of 2006. Why does this happen? Heat tint colour chart. Rainbow discoloration, otherwise known as heat tint, is the ugly rainbow pattern that develops inside the pan (or stainless cooktops and sinks!) Stainless steel is an alloy that contains some chromium so it … Heat temper weld . Lighter Colors May Be Acceptable F. old. Stainless steel without chromium is just steel, and steel likes to rust. It is vital to maintain a low level of oxygen before, during and after welding, which will help achieve welds that are free from oxidation, discolouration and are metallurgically sound. (1968) My Chemistry teacher showed me how to silver-plate a copper penny without heat … So here’s the bottom line: when you see colors in a stainless steel weld, or the neighboring heat affected zone, it means the corrosion resistance has been reduced in that area. Does anyone know where I can obtain a chart that would describe the heat tint discoloration of stainless steels. The heat tint or temper colour formed is caused by the… Heat Tint Recognition Chart For Stainless Steel Welding . BILL WORDEN. THIS INFORMATION MUST BE USED WITH CARE WHEN INTREPETING THE HINT TINT COLOURS OBSERVED ON STAINLESS STEEL SURFACES AS THE HEATING CONDITIONS ARE NOT SPECIFIED. A by-effect of the laser interaction with some metals is a physical and chemical reaction called the heat-tint effect, which results in the change of the metal surface color. Colors that are likely to form on stainless steel 304 if … What I am concerned about is a line that is welded to a thermal oxidizer which operates around 600 deg.C which is around 1112 deg. And the darker the color, the worse this is. Heat tint (temper) colours on stainless steel surfaces The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The use of a Weld Purge Monitor® throughout the cycle is therefore necessary. The color combination depends largely on the amount of heat used during welding – darker colors (brown, blue, and purple) are usually formed at higher temperatures (> 370 °C or 698 °F). The table below represents the temper colours that are likely to form on stainless steel type 1.4301 (AISI 304) if heated in air.