A high performace nickel alloy used for severe corrosion environments
- Excellent corrosion resistance to reducing and oxidizing environments
- Well suited for hydrochloric acid, sulfuric acid and nitric acid environments
- Strong resistance to stress corrosion cracking
- Excellent mechanical properties at elevated temperatures up to 1500°F / 815°C
- Alloy grades: C276, B2, B3, C22, C2000, Hastelloy X
Hastelloy C276 flanges, which are in stock and available now, are generally considered a versatile and highly corrosion resistant alloy. Hastelloy C276 flanges have excellent corrosion resistance in both oxidizing and reducing media which makes it well suited for a variety of strong corrosive applications. Hastelloy C276 flanges also have exceptional resistance to both sulfuric acid and hydrochloric acid.
Because Hastelloy C276 flanges resist some of the most severe media, Hastelloy C276 flanges are often utilized in chemical processing applications where acid chlorides, solvents, formic and acetic acids, acetic anhydride, wet chlorine gas, hypochlorites, chlorine solutions and phosphoric acid are used. For chemical processing applications, Hastelloy C276 flanges are the most common grade and one of the most corrosion resistant nickel alloys - exceeding that of most other nickel alloy grades like Inconel or Monel.
Availability: A large inventory of Hastelloy C276 flanges are available for immediate delivery along with bolt, nuts, washers and lock washers. Most common sizes of Hastelloy C276 flanges and fasteners are in stock; all sizes can be made to order.
- Chemical processing depends on hastelloy C276 flanges for many aspects of their processes ranging from heat exchangers, reaction vessels, evaporators, columns piping, pumps and valves to name a few.
- Hastelloy C276 flanges play a key role in oil & gas, especially in sour gas (H2S)wells.
- Air Pollution Control systems look to C276 flanges for flue gas desulfurization systems, stack liners, absorbers, stack gas re-heaters and fans because C276 flanges offer an ideal combination of sufluric acid and chloride resistance.
- C276 flanges are commonly used in the pulp and paper industry for bleaching vessels and digesters.
- Due to use of seawater as a coolant to various types of industrial facilities, as well as in marine transportation and offshore oil rigs, Hastelloy C276 flanges are a choice for their chloride crevice corrosion resistance.
Confused about which grade of Hastelloy bolts are best for your corrosive application? Read this short blog post which gives an overview of each grade's strength. If you need more indepth direction, visit our Hastelloy grade pages or contact our engineering team.
Hastelloy C276 alloy, UNS N10276, is the most widely used and versatile, corrosion resistant alloy. Very good resistance to reducing, and mildly oxidizing corrosives. Excellent stress corrosion cracking resistance with very good resistance to localized attack. Select the following links for more details about Hastelloy C276 Fasteners, Hastelloy C276 Bolts, Hastelloy C276 Screws, and Hastelloy C276 Flanges.
Hastelloy C276 Specifications: N10276, ASTM B574, ASME SB574, Werkstoff 2.4819, ASTM G28-A/B, EN 10204-3.1, ASME B18.2.2, ASTM B619, ASME SB619, ASTM B366, ASME SB366, WPHC276, ASME B16.11, ASTM B564/ASME SB564, COLD DRAWN, HOT FINISHED, ASTM B575, ASME SB575, COLD ROLLED, HOT ROLLED, ASME B16.9, ASME B16.5, ASTM B462, ASME SB462
Hastelloy B3 alloy, UNS N10665, resistance to hydrochloric acid and other strongly reducing chemicals but has poor corrosion resistance to oxidizing chemicals and in the presence of ferric or cupric salts. In addition, Hastelloy B2 has excellent resistance to pitting and stress corrosion cracking. However B2 has little chromium, and it should NOT be used with oxidizing media in the presence of salts. Select the following links for more details about Hastelloy B2 Bolts, Screws, and Flanges.
Hastelloy B2 Specifications: N10665, ASTM B619, Werkstoff 2.4617, ASME SB619, ANNEALED, B/SB619 CLASS I OR II, X-RAY PER ASME SECTION VIII DIVISION 1 UW-51, MERCURY FREE, EN 10204-3.1, ASTM B366, ASME SB366, WPHB2-S, ASME B16.11, ASTM B335, ASME SB335, ASME B16.3, MSS SP-83, ASTM B564/ASME SB564, COLD DRAWN, HOT FINISHED, ASTM B333, ASME SB333, SHEET IS COLD ROLLED, HOT ROLLED, ENIMO-7, AWS A-5.11, ASME SFA-5.11
Hastelloy B3 alloy, UNS N10675, is specifically designed to deal with very aggressive hydrochloric acid (HCl), hyrdrobromic acid (HBr) and sulfuric acids (H2SO4) as well as acetic, formic and phosphoric acids. Additionally Hastelloy B3 has improved structural integrity over B2. However B3 has little chromium, and it should NOT be used with oxidizing media in the presence of salts. Select the following links for more details about Hastelloy B3 Bolts, Screws, and Flanges.
Hastelloy B3 Specifications: N10675, ASTM B366, ASME SB366, Werkstoff 2.4600, WPHB3-W, ASME B16.9, ANNEALED, MERCURY FREE, EN 10204-3.1 (W/O X-RAY), ASTM B335, ASME SB335, ASTM B564, ASME SB564, DIMENSIONS PER ASME B16.5, ASTM B462, ASME SB462, ASME B16.5, COLD DRAWN, HOT FINISHED, ASTM B626, ASME SB626, B/SB626 CLASS III, ASTM B333, ASME SB333, COLD ROLLED, HOT ROLLED
Hastelloy C22 alloy, UNS N06022, has better overall corrosion resistance in oxidizing corrosives than C-276 and Inconel 625 alloys due to the higher chromium content. Outstanding resistance to localized corrosion and excellent resistance to stress corrosion cracking. This alloy has limited availability and can be made into fastener in larger diameters only (1/2" and greater in size). Select the following links for more details about Hastelloy C22 Bolts, Screws, and Flanges.
Hastelloy C22 Specifications: SB 575/B 575, SB 574/B 574, SB 366/B 366 SB 462/B 462, SB 564/B 564 SB 462/B 462, Werkstoff 2.4602, 17744 No. 2.4602 NiCr21Mo14W, NACE MR0175 ISO 15156
Hastelloy C2000 alloy, UNS N06200, is a corrosion resistant alloy with excellent resistance to uniform corrosion in oxidizing or re-ducing environments. Due to the addition of copper and the high content of chromium, it has enhanced corrosion resistance to sulfuric acid and process streams contaminated with ferric ions. In addition it has excellent resistance to stress corrosion cracking and superior resistance to localized corrosion as compared to C-276 alloy. This alloy has limited availability and can be made into sizes only 1/2" and greater is size for fasteners and flanges. Select the following links for more details about Hastelloy C2000 Bolts, Screws, and Flanges.
Hastelloy C2000 Specifications: SB 575/B 575, SB 574/B 574, SB 366/B 366 SB 462/B 462,SB 564/B 564 SB 462/B 462, Werkstoff 2.4675, NACE MR0175 ISO 15156
Alloy X, UNS N06002, is most known for its exceptional combination of high temperature oxidation resistance up to 2000°C and high temperature strength. Being stable, strong and ductile at high temperatures are its most notable characteristics which is often utilized in gas turbine components and furnace components.
Hastelloy X Specifications: AMS 5536, AMS 5754, AMS 5798, ASME SB 435, ASME SB 572, ASME Sect. IX P No. 43, ASME Section IX P No. 43, ASME SFA 5.14, ASTM B 435, ASTM B 572, EN 2.4665, GE B50A436, GE B50T83, GE B50TF24, PDS 1038 (X-low), PDS 15102QFC, UNS N06002, Werkstoff 2.4665
Exceptional resistance to hot acids is the single most attractive attribute of Hastelloy C276 flanges. This nickel alloy is resistant to the following environments from moderately oxidizing to strong reducing conditions:
- Sulfuric acid and hydrochloric acid
- Acid chlorides, solvents, formic and acetic acids
- Acetic anhydride, hypochlorites and chlorine solutions.
- One of the few grades resistant to wet chloride gas and chlorine dioxide.
Also, it has excellent resistance to phosphoric acid at all temperatures below boiling and at concentrations lower than 65%. The only factor that is critical to point out when dealing with strong oxidizing environments is that Hastelloy C276 flanges have a low chromium content which prevents it from being used strongly oxidizing environments like hot, concentrated nitric acid.