Swagelok’s Post

Did you know that stainless steel and other metals can burn? They don't typically burn in open air, but they certainly can in a high-pressure, enriched oxygen environment, as I noted in my previous post about #oxygen and the #FireTriangle. (See link in comments.) When working with high-pressure oxygen systems, proper material selection, combined with effective cleaning/filtration, can break the fuel leg of the triangle, minimizing the chances of a fire. Make sure to carefully select metals that are burn-resistant for the process conditions. Brass, copper, and alloy 400 are among the best choices for metallic components, showing extraordinary burn-resistance across a wide pressure range. 300 series stainless steels can also often be used at pressures below 10 bar but use them very cautiously, especially at higher pressures. Generally, avoid aluminum and carbon steel, which have been shown to be flammable, even at low pressures. In addition to metallic components, pay attention to the plastics and elastomers in the system. They will all be flammable, but steer towards materials with a higher auto-ignition temperatures. Choose materials such as PTFE and PEEK over acetal or polyethylene. Likewise, choose FKM or FFKM over EPDM or Nitrile. The higher auto-ignition temperature will make them more resistant to some of the more common ignition mechanisms, which I will cover in some upcoming posts. Stay tuned! Note: Photo shows an aluminum oxygen regulator that caught fire due to particle impact. Image courtesy of WHA International, Inc.

Here we go for another article! Let's investigate the stainless steel's behavior after the electroplating treatment. #Stainlesssteel #electroplating #nickel

254SMO super austenitic stainless steel, German brand number is 1.4547, UNS brand number is S31254. The carbon content of 1.254SMO is very low, which means that the risk of carbide precipitation due to heating is very small. 2. Due to its high molybdenum content, it has extremely high resistance to pitting corrosion and crevice corrosion. This grade of stainless steel was developed for use in environments containing halides such as seawater. Also has good resistance to uniform corrosion. Especially in halide-containing acids. 3. This type of steel has very good resistance to local corrosion. It has good resistance to pitting corrosion (PI ≥ 40) and good resistance to stress corrosion under conditions such as seawater, air, gaps, and low-speed erosion. It is Ni Substitute materials for base alloys and titanium alloys. 4. Secondly, in terms of high temperature resistance or corrosion resistance, it has more advanced high temperature resistance or corrosion resistance, which is irreplaceable for 304 stainless steel.

Stainless steel is safe and does not release nickel, isn't it? Under normal conditions this is true and that is why 316L alloy is considered hypoallergenic, but things change after electroplating. This is a well-known problem among manufacturers in the fashion electroplating industry. In this article, we have dealt with this topic by seeking solutions to limit and understand the mechanism of nickel release from electroplated stainless steel items. Click here to read the full paper 👉 https://lnkd.in/dDTnjz2g Authors: Roberta Emanuele, Andrea Comparini, Margherita Verrucchi, IVAN DEL PACE, Arianna Meoli, Mariya Vorobyova, Walter Giurlani, Massimo Innocenti In collaboratin with Valmet Published on Heliyon Journal - Elsevier #NickelRelease #Electroplating #316L #StainlessSteel #EN1811 #Dermatitis #Nickelallergy

Happy New Year ,2024! #Sharing for knowledge duplex 2507 and 2205 stainless steel what is the difference between duplex 2507 and 2205 stainless steel ? 1),In terms of product classification ,2205 is duplex stainless steel ,while 2507 is super duplex stainless steel ; 2),In terms of Chemical Composition，compared to Duplex 2205, Duplex 2507 contains higher levels of molybdenum, chromium, and nitrogen, with the molybdenum content being approximately twice that of Duplex 2205.These difference makes 2507 exhibit better corrosion resistance and higher strenth than 2205; 3),In terms of physical performance, 2507 surpasses 2205. It has higher yield strength, tensile strength, and impact toughness. However, these advantages come at the cost of reduced ductility. 4), In terms of corrosion resistance,Duplex 2507 demonstrates superior corrosion resistance, especially in chloride-rich and acidic environments. It boasts good wear resistance, excellent pitting resistance, and outstanding resistance to intergranular corrosion, surpassing Duplex 2205 in these aspects.

Martensitic Stainless Steels; AISI 403 & S40300 & Annealed (ferrite and carbides) and quenched and tempered (tempered martensite) microstructures of AISI 402; Vilella’s reagent. Chemical Composition of AISI 403(ASTM A176-99) C: %0,15 max Mn: %1,0 max P: %0,040 max S: %0.030 max Si: %0,50 max Cr: %11,50-13,00 Fe: Balance Ni:%0,60 Heat Treatmant of AISI 403 Annealin Temperature: 843.33°C - 898.89°C Hardeness: 75-83 HRB Hardening Temperature: 926.67°C - 1010.0°C Hardeness: 39-43 HRC Stress Relieving Temperature: 232.22°C - 371.11°C Hardeness: 37-40 HRC Tempering Temperature: 537.78°C - 593.33°C Hardeness: 34HRC-86HRB a_Cool slowly to 1,100 °F. b_Although these steels harden appreciably on air cooling, quenching in oil is preferable. c_Full annealing impractical; may be air cooled from indicated temperature. d_Generally used in annealed condition only. e_Air cool. f_Cooling may be in air or by quenching in water. The resultant hardness of all of these steels will be in the range of approximately Rockwell B 80 to 90

#Passivation protects surfaces of ferrous materials like steel and stainless steel from corrosion or rust, ensuring improved appearance, performance, and cleanliness. This chemical treatment involves immersing machined metal parts in an acid bath, such as Nitric or citric acid, to free iron from their surface to achieve a smooth and polished finish. Since passivation is not a coating, it doesn’t require masking and won’t add any thickness to the machined part. The acid-based bath removes traces of iron and rust from the part’s surface, producing a layer composed of chromium or nickel on the metal part’s surface. Despite nitric acid being the traditional passivation choice, citric acid bath has become the widely embraced choice due to its shorter cycle times. Passivated parts are rust-resistant and are ideal for outdoor applications. More so, passivation is a commonly used surface finish across various industries, from the #aerospace industry, with demand for high-quality steel and the tightest #dimensional #tolerances, to the medical sector, where sterilization and longevity of products are paramount. However, passivating machined parts can result in extended part production time because these machined metal parts must undergo pre-treatments such as cleaning to remove debris, greases, or other contaminants. Although submersion is the most commonly used passivation technique due to its faster cycles and consistency, acidic spray is a better alternative.

Stainless Steel Pleated Filter Cartridge 😎  🌼 Types: ☆ Stainless steel wire mesh ☆ Stainless steel fiber sintered felt 🌼 Advantages: ●Stainless steel wire mesh:  ☆ Large filtration area (5-10 times the ordinary cylindrical filter) ☆ Smooth holes ☆ Easy to clean ☆ High temperature resistance ☆ Anti-corrosion ☆ Wire mesh not easy to fall off ☆ Long usage time ●Stainless steel fiber sintered felt:  ☆ Large filtration area (5-10 times the ordinary cylindrical filter) ☆ High porosity ☆ Good air permeability ☆ Strong pollution absorption capacity 🌼Application: ☆ Polymer melt filtration in polyester, filament, short filament, and thin film production ☆ High-temperature gas filtration ☆ Steam filtration ☆ High-temperature liquid, viscous liquid filtration #filter #filters #watertreatment #polymers #filament #thinfilms #gas #filtration 

The advantages of #titanium #alloy #screws #titanium #ti6al4v #gr5titanium 1）The tensile strength of #titanium alloy screws is higher than that of ordinary screws, which can withstand higher weight and tension, improving the quality and stability of mechanical components. 2）Titanium alloy screws do not rust and can be used in various corrosive environments. This is very important for mechanical devices used in marine, chemical, or other industrial fields with corrosive substances. 3）Titanium alloy screws are lighter than ordinary screws, but they still have similar strength and hardness. This makes mechanical components using titanium alloy screws more durable and has lower maintenance costs. 4）Titanium alloy screws have good high-temperature stability and can be used in high-temperature environments, making them very useful for mechanical devices in some special fields. #titanium bolts stock #titanium bolts wholesale #titanium screws

#aluminium #foil 3003 aluminum foil is a commonly used aluminum foil for packaging. The commonly used tempers are H14, H16 and H18. It has multiple advantages such as food grade, clean oil removal, less holes, good product shape, and no deformation when cutting.