normally, the basket would fail. However, before you settle on a specific alloy for the custom parts washing baskets in your production application, be sure to check with an experienced mechanical engineer, as they can take into account other factors that might affect your custom basket’s design needs, such as chemicals used in your process or weight load of the basket. 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. 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. Corrosion aka rust. Hand Sanitizer Stands in Stock - Ships Today! 2. 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. Though these marks appear as damage to the surface, they are simply a discoloration that can easily be removed. The part was always bright after heat treating. One of the key properties of any stainless steel alloy is its resistance to oxidation. Simply setting a hot pan on the surface can result in a mark left behind. However, this can compromise the corrosion resistance of the metal, making it more susceptible to corrosion damage from exposure to moisture. Stainless Steel Discoloration: 4 Questions Engineers Need Answered, resistance to oxidation and discoloration. Organic contamina… This expansion coefficient not only varies between steel grades, it also increases slightly with temperature. But really, stainless steel that is exposed to high heat can cause some discoloration depending on the temperature reached. The temperature tolerance of grade 316 stainless steel is close to that of grade 304, being just a little bit lower. The photos far left show the weld discoloration using the naked eye while the photos The colors are affected to some extent by the composition of the steel and the method may not be dependable. As noted in an AK Steel data sheet on 304 stainless steel, the alloy reaches its melting point at the 2,550 °F – 2,650 °F (1399 °C – 1454 °C) range. The characteristics that make some of the stainless steels particularly useful in high-temperature environments are described, and typical engineering data are presented. However, the downside to using chromium is that when it is heated to extremely high temperatures, it will leave a different colored surface behind. 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. of a piece of 1-1/2" 316L stainless steel tube split in half. Though these marks appear as damage to the surface, they are simply a discoloration that can easily be removed. 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. Mechanical removal or this heat tint should be limited to clean glass bead blasting, flapper wheels, aluminum oxide discs, and wire brushing with austenitic stainless steel wire brushes. I asked my customer, he said no. Stainless steel is a sturdy and reliable material commonly used in kitchen sinks, appliances and cookware. Is Grade 317 Stainless Steel Worth the Cost Over 316 & 304? We used to use an old Stuart cell hydrogen generator to produce our atmosphere for the furnace but when we annealed stainless it would turn dark blue. Response from weldingtipsandtricks.com on stainless steel welds. Another popular alloy of stainless steel, grade 316 SS is often used for applications that involve powerful corrosives, as its corrosion resistance generally exceeds that of grade 304 SS. Chromium gives stainless steel its rust and stain-resistant properties, while nickel gives it its color. How do you clean oxidized stainless steel? Hand Sanitizer Stands in Stock - Ships Today! Heat Treating Stainless Steel Discoloration. Carbide precipitation may occur in certain austenitic stainless steels in a temperature range of 800-1650°F (427-899°C). 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. Discoloration is oxidation. Stainless steel brings the look of sleek sophistication to your kitchen. Sharp, sudden impacts could also cause similar issues. Stainless Steel Baskets. Dip a soft cloth in vinegar and rub over the surface of the stainless steel. The method of moving a basket affects what impact risks there are, as well as what special attachments the basket might need (handles, hoist rings, flat/rounded corners, etc.). we generally recommend limiting exposure to 1,900. In of parts/materials, and had a capacity of 100 lbs. The stainless steel then is rapidly cooled (through the temperature range of 1,600 and 800 degrees F, or 870 and 425 degrees C) to inhibit carbide precipitation, and then at lower temperatures exposed to air, where the protective oxide film forms spontaneously. 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. Contact a Marlin Steel Mechanical Engineer Expert for your next project. This oxidation causes the discoloration often seen on steel after heat treatments. Removal of weld discoloration. Melting Points of Heat-Treating Baths This is why engineers need to know not only the maximum load weight of a basket, but how it will be moved from one manufacturing process to the next. Basic cleaning to remove particulates from the surface of stainless steel can help prevent discoloration—unless the wrong tools and techniques are applied. Some alloys can better resist oxidation from high temperatures, which is a major factor in choosing a particular alloy to use. Oxidation of stainless steel indicates that the metal temperature at the oxidized surface was in excess of 1000 °F. 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. Mix the baking soda with a small amount of water to make a paste and clean with a damp cloth. Its industrial material handling containers serve many industries including aerospace, defense, medical and automotive. Well, the answer varies based on a few different factors, including: Just to name a few potential factors that might affect the performance of a steel alloy being exposed to high temperature applications. The heat treater asked if discoloration was a problem. This discoloration is sometimes known as “bluing.” An oxide layer that you can see by color change is not a protective oxide layer that is obtained by chemical passivation. 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). Its industrial material handling containers serve many industries including aerospace, defense, medical and automotive. So, if the basket were to be loaded with 50 lbs. Also, extremely high temperatures might limit the viability of different coatings that might be used with the steel. of a piece of 1-1/2" 316L stainless steel tube split in half. It is easy to care for and clean, but occasionally an unsightly discoloration develops. Color temperature imaging. 2007. As metals heat up, they can undergo expansion that causes them to lose their shape—ruining delicately-assembled custom wire and sheet metal forms. For example, say that you had a container made of plain steel that you were passing through a process where the temperature would reach 1,000 °F. Contact a Marlin Steel Mechanical Engineer Expert for your next 316 Stainless Steel project. The effect of thermal expansion is most noticeable where components are restrained, as the expansion results in buckling and bending. Figure 3. In addition, the quality of the air and what contaminants are in it can also affect the thickness of the layer. and sheet metal. In trying to minimize distortion, different heat treat options were being tried. Marlin Steel is a leading manufacturer of custom‐engineered products from steel wire Pusher, walking beam, and vacuum furnaces are used for higher temperatures up to approximately 1345 °C (2450 °F). 440C stainless steel (the “C” denotes a higher carbon content) is well-suited for tool and die applications in the food processing industry due to its higher hardness. I am a metal stamper producing a star washer out of 410 annealed stainless. What is the Temperature Range for 304 Stainless Steel vs. 316 vs. 330? The heat treater asked if discoloration was a problem. This makes grade 316 alloy slightly less desirable for high temperature applications than grade 304 alloy. I asked my customer, he said no. We have examined our setup which is as follows: We use a stainless steel rectangular tube filled with hydrogen running at 1900 Deg F. If we have a new tube we can run either bottled gas or new house hydrogen and the material is spotless. The parts came back dull grey almost black appearance. Many of Marlin Steel’s customers use production processes that involve high temperatures. 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°. Marlin Steel is a leading manufacturer of custom‐engineered products from steel wire Stainless steel is made of different components, and one of those components is chromium. With this in mind, what are the temperature ranges of different stainless steel alloys such as grade 304, 316, and 330? Other alloys, such as grade 316 SS, are much less susceptible to discoloration and corrosion from salt. Each Figure 2. Contact a Marlin Steel Mechanical Engineer Expert for your next 304 Stainless Steel project. This is because the basket would now have a maximum weight limit of 20 lbs. Don’t Neglect the Oven. 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. Because of this, many of Marlin’s clients ask the following question: “what’s the temperature range for (insert given steel alloy here)?”. Contact: 01937 584440 The heat streaks should … at 1,000 °F. Simply setting a hot pan on the surface can result in a mark left behind. Length of time that the alloy is subjected to a given temperature. While this technique may seem basic to some of you — cooking on high heat can burn food and give you less flexibility as you cook — stainless steel will discolor from constant high heat. From sterilization of parts to the heat treatment of specific alloys, there are a ton of applications that might require a custom parts cleaning basket to be put through temperatures in excess of 1,000 °F. 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. As noted on the Penn Stainless website, grade 330 alloy “has great oxidation resistance and resists scale formation up to about 2000°F due to its chromium and nickel content.”. While not normally a contributing factor to the discoloration of stainless steel, the load on a piece of stainless steel wire or sheet metal can be a contributing factor to damage when other stress factors are present. Colors that are likely to form on stainless steel 304 if heated in air. As stated in an AK Steel data sheet for grade 316 stainless steel, the melting range of 316 SS is 2,500 °F – 2,550 °F (1,371 °C – 1,399 °C), roughly 50 to 100 degrees Fahrenheit lower than the melting point of grade 304 stainless. These brushes could compromise the integrity of the stainless alloy’s protective oxide layer by depositing plain iron molecules. Custom Wire Baskets, Typically speaking, the alloy has between 18 and 22% chromium content, and 34 to 37% nickel content. During welding, some discoloration, which is a thin oxide layer, will be evident in the heated area near the weld. A discussion started in 2007 but continuing through 2019. Unlike the previous two stainless steel alloys, grade 330 stainless is frequently specifically marketed as a high-temperature resistant alloy. If steel is heated in an oxidizing atmosphere - like air - a film of oxide forms on the surface and the color changes as the temperature increases. for high-temperature service. Steel Tempering Colour Chart – West Yorkshire Steel Co Ltd, ISO quality steel suppliers, UK delivery only £25 The largest knowledge of steel grades online. The photo at left illustrates the color on the weld and in the HAZ of a weld made with 10 ppm O 2. Also discussed, but as a secondary consideration, are the corrosion-resistance qualities of stainless steels at elevated temperatures. I have further information about the blueing of stainless steel during annealing in hydrogen atmosphere. Stainless steel discoloration during heat treating 2002. Steel Wire Products, The chromium is included in the creation of stainless steel to avoid rusting or corrosion over time. On the other hand, 304 stainless is one of the oldest variants of stainless steel and is typically used in household applications and is one of the most common metal alloys available today. On the other hand, 304 stainless is one of the oldest variants of stainless steel and is typically used in household applications and is one of the most common metal alloys available today. 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. These are just a few of the things that a mechanical engineer will need to know prior to creating a custom stainless steel basket or tray so as to ensure top performance and minimize the risk of discoloration. Also, take a look at the chart to see how the temperature can discolor your grill. Maintenance is a must for keeping any tool in top working condition. Contact: 01937 584440 Let’s go back to the times approaching the 20th century. The color of stainless steel surfaces changes to that of γ-Fe 2 O 3. Surface discoloration and red rust after heat treatment of the phosphate film on the surface of the stainless steel screw. This could, in turn, impact other performance characteristics of the steel, such as its resistance to discoloration. In laser cleaning of stainless steel surfaces, the discoloration takes place on the surfaces irradiated by excimer lasers in the air as laser fluence and pulse number exceed a discoloration threshold. In 2648 Merchant DriveBaltimore, MD 21230-3307. 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