old. 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. Stainless steel is an alloy that contains some chromium so it … Why does this happen? Heat Tint Recognition Chart For Stainless Steel Welding . (1968) My Chemistry teacher showed me how to silver-plate a copper penny without heat … Heat temper weld . My name is Bill Worden. due to excessive heat or too rapid heating. BILL WORDEN. And the darker the color, the worse this is. 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. Stainless steel without chromium is just steel, and steel likes to rust. I am the founder & owner of STEEL F/X® Patinas, which began officially in the fall of 2006. Heat Colors. PERCEIVED COLORS DEPEND ON LIGHTING. 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. F. Does anyone know where I can obtain a chart that would describe the heat tint discoloration of stainless steels. 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. 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. The use of a Weld Purge Monitor® throughout the cycle is therefore necessary. Colors that are likely to form on stainless steel 304 if … 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). Heat tint colour chart. The color engraving is possible on oxygen hungry materials such as: titan; stainless steel; zirconium; aluminum; nickel; brass; silver. Rainbow discoloration, otherwise known as heat tint, is the ugly rainbow pattern that develops inside the pan (or stainless cooktops and sinks!) The table below represents the temper colours that are likely to form on stainless steel type 1.4301 (AISI 304) if heated in air. 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. 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. Back to “How To” Page 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. Lighter Colors May Be Acceptable I had my first exposure to metal-finishing when I was 14 yrs. The heat tint or temper colour formed is caused by the… The corrosion damage near the welded joint in the boiler of AISI 304L stainless steel was analysed.