But really, stainless steel that is exposed to high heat can cause some discoloration depending on the temperature reached. Simply setting a hot pan on the surface can result in a mark left behind. of a piece of 1-1/2" 316L stainless steel tube split in half. Simply setting a hot pan on the surface can result in a mark left behind. To protect your stainless steel wire forms and sheet metal products against discoloration, there are numerous questions that engineers designing stainless steel products will need answered, including: Different stainless steel alloys will have different reactions to elevated temperatures. Q. I'm new to the whole method of heat treating but I've got a question that I hope some of you have the answers to. Stainless Steel Discoloration: 4 Questions Engineers Need Answered, resistance to oxidation and discoloration. Although Dutch ovens get the most exposure as being stovetop- and oven-friendly pans, you can also use your stainless steel pans in the oven. Length of time that the alloy is subjected to a given temperature. Steel Tempering Colour Chart – West Yorkshire Steel Co Ltd, ISO quality steel suppliers, UK delivery only £25 The largest knowledge of steel grades online. Plain iron, once embedded in the surface of the steel, creates gaps in the oxide layer that allow rust particles to accumulate. 2648 Merchant DriveBaltimore, MD 21230-3307. Overheating in Stainless steel welding! This is because the basket would now have a maximum weight limit of 20 lbs. The characteristics that make some of the stainless steels particularly useful in high-temperature environments are described, and typical engineering data are presented. Heat Treating Stainless Steel Discoloration. The colors are affected to some extent by the composition of the steel and the method may not be dependable. Some alloys can better resist oxidation from high temperatures, which is a major factor in choosing a particular alloy to use. In You will have noticed that it gets a brown stain within minutes. The photo at left illustrates the color on the weld and in the HAZ of a weld made with 10 ppm O 2. Looking at your picture, something either came into contact with the bottom of the iPhone grill area or it’s heat that’s being produced from your charger, which is discoloring the metal like that. The surface discoloration on stainless steel after grinding or welding is surface oxidation. If your application’s operating temperature exceeds 1,900 °F, you might want to consider a different alloy, such as Inconel, which is specifically formulated for high-temperature applications. These brushes could compromise the integrity of the stainless alloy’s protective oxide layer by depositing plain iron molecules. A sample of stainless that was heated to 600 degrees for a long time may display the same color as one heated to 800 degrees for a shorter time. Marlin Steel is a leading manufacturer of custom‐engineered products from steel wire Hand Sanitizer Stands in Stock - Ships Today! While stainless steel is famous for its resistance to oxidation and discoloration in most “normal” use cases, it’s important to note that no alloy is 100% impervious under all situations. It is easy to care for and clean, but occasionally an unsightly discoloration develops. In both procedures the surface is cleaned of contaminants and the metal surface is subsequently oxidized. While most stainless steels are resistant to oxidation at low temperatures, the various metal in the steel formulation (iron, chromium, molybdenum, etc.) Surface discoloration and red rust after heat treatment of the phosphate film on the surface of the stainless steel screw. However, the downside to using chromium is that when it is heated to extremely high temperatures, it will leave a different colored surface behind. For any formulation of stainless steel alloy, there is always some combination of temperature, chemicals, mechanical force, and other stress factors that could compromise the appearance of the steel. That’s *exactly* what stainless looks like when it’s under a higher temperature, it starts to form a rainbow-like color. The photo at left illustrates the color on the weld and in the HAZ of a weld made with 10 ppm O 2. Chromium gives stainless steel its rust and stain-resistant properties, while nickel gives it its color. This expansion coefficient not only varies between steel grades, it also increases slightly with temperature. Is 316 Stainless Steel Worth the Extra Cost over 304? Heating the stainless steel to temperatures in excess 800 °F can cause metallurgical changes and reduce corrosion resistance in a manner that is not corrected by surface cleaning or chemical passivation. Figure 3. hbspt.cta._relativeUrls=true;hbspt.cta.load(223565, 'b7462dd0-e24f-4f7a-a87d-5e26bfa0ff87', {}); A summary sheet comparing key characteristics of commonly used stainless steel alloys. Check with the manufacturer to make sure your pan is oven-safe, but most high-quality stainless steel is rated for temperatures up to 500°. normally, the basket would fail. This expansion coefficient not only varies between steel grades, it also increases slightly with temperature. It is just a matter of the argon shielding envelope leaving the hot metal before it has a chance to cool enough to not oxidize. Each Figure 2. An oxide layer that you can see by color change is not a protective oxide layer that is obtained by chemical passivation. In other words, you can expose grade 304 alloy steel to temperatures of up to 1,598 ° F for short periods of time without ill effect, and for extended periods of time in temperatures of up to 1,697 ° F. However, this can compromise the corrosion resistance of the metal, making it more susceptible to corrosion damage from exposure to moisture. Also, take a look at the chart to see how the temperature can discolor your grill. The cleaning fluid still remains on the surface of the stainless steel screw, so after a period of use, the cleaning fluid will react with it. Grade 304 has a coefficient of 17.2 x 10-6 /°C over the temperature range 0 to 100°C but increases above this temperature. From the above analysis of the discoloration principle, it can be seen that the root cause of the discoloration is the oxidation of the surface of the stainless steel sheet, which leads to the interference color caused by the change of the thickness of the passivation film (oxide film). Steel Wire Products, So, if the basket were to be loaded with 50 lbs. With this in mind, what are the temperature ranges of different stainless steel alloys such as grade 304, 316, and 330? 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