Hastelloy C276 Fasteners & Flanges

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
• Hastelloy C276 datasheet

Hastelloy C276 fasteners and flanges, which are in stock and available now, are generally considered a versatile and highly corrosion resistant alloy. Hastelloy C276 fasteners and 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  fasteners and flanges also have exceptional resistance to both sulfuric acid and hydrochloric acid.

Because Hastelloy C276 fasteners and flanges resist some of the most severe media, Hastelloy C276 fasteners and 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 fasteners and 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 fasteners and flanges are available for immediate delivery along with nuts, washers and lock washers. Most common sizes of Hastelloy C276 fasteners and flanges are in stock; all sizes can be made to order.

Common Uses

• Chemical processing depends on hastelloy C276 fasteners and 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 fasteners and flanges play a key role in oil & gas, especially in sour gas (H2S)wells.
• Air Pollution Control systems look to C276 fasteners and flanges for flue gas desulfurization systems, stack liners, absorbers, stack gas re-heaters and fans because C276 fasteners and flanges offer an ideal combination of sufluric acid and chloride resistance.
• C276 fasteners and 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 fasteners and flanges are a choice for their chloride crevice corrosion resistance.

Resources: Hastelloy Torque Spec, Flange Dimensions, Flange Bolting Chart

Hastelloy C276 Fastener Types: Bolts, Nuts, Screws, Studs, Threaded Rods, Washers

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

Common Hastelloy Bolt Grades

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

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. For more indepth material information download our Hastelloy C276 datasheet.

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 B2

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

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

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

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.

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

HASTELLOY X 

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

Mechanical Properties of Hastelloy C276 fasteners and flanges

Hastelloy C276 Fastener Corrosion Data

Corrosion Resistance
Exceptional resistance to hot acids is the single most attractive attribute of Hastelloy C276 fasteners and 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 fasteners and flanges have a low chromium content which prevents it from being used strongly oxidizing environments like hot, concentrated nitric acid.

Hastelloy C276 Iso-Corrosion Curves for Sulfuric Acid

Hastelloy C276 Iso-Corrosion Curves for Hydrochloric Acid

Hastelloy C276 Iso-Corrosion Curves for Nitric Acid

Hastelloy C22 Fasteners & Flanges

A high performace nickel alloy used for severe corrosion environments

• Hastelloy Corrosion Data
• Chemistry and Specifications
• Mechanical Properties

This specialty nickel alloy offers better overall corrosion resistance to its sister alloy Hastelloy C-276, more specifically, it provides better protection when used in certain saturated wet chlorine environments. In addition, its high chromium content provides C22 fasteners and flanges much better resistance to oxidizing media that C276. This provides it exceptional resistance to chloride-induced pitting although, in most cases because of its availability, C-276 fasteners are a more cost-effective option especially in sizes less than 1/2". Hastelloy C22 fasteners and flanges are best known for its resistance to pitting and crevice corrosion – which is unmatched in the high performance nickel alloy class. Use of C22 fasteners should be limited to temperatures below 1250°F due to the formation of detrimental phases which form above this temperature.

Availability: Hastelloy C22 fasteners are generally available in 1/2" sizes and larger due to materials availability. Most C22 fasteners are made to order.

Corrosion Performance

• Sulfuric Acid
• Hydrochloric Acid
• Nitric Acid
• Phosphoric Acid

Key Benefits

• Alloy C-22 has outstanding resistance to pitting, crevice corrosion and stress-corrosion cracking
• Extremely high protection from wet chlorine environments
• Excellent resistance to a wide variety of chemical process environments including strong oxidizers such as ferric acids, acetic anhydride, hot contaminated media (organic and inorganic), and seawater and brine solutions
• Similar overall corrosion protection compared to C276
• Very ductile, exhibits excellent weldability

Welding
Alloy C22 is considered the best alloy to use as universal weld filler metal to resist corrosion of weldments. These C22 fasteners and flanges will resist the formation of grain boundary precipitates in the weld heat zone, which make them ideal most chemical process applications in the welded condition.

Uses

• Hastelloy C22 fasteners and flanges protect extensively against the most corrosive flue gas desulfurization systems and the most sophisticated pharmaceutical reaction vessels
• Chemical process industries depend on C22 fasteners for use in equipment like flue gas scrubbers, chlorination systems, sulfur dioxide scrubbers, pulp and paper bleach plants, pickling systems, and nuclear fuel reprocessing

Resources: Hastelloy Torque Spec, Flange Dimensions, Flange Bolting Chart

Hastelloy Fastener Types: Bolts, Nuts, Screws, Studs, Threaded Rods, Washers

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges 

Hastelloy C22 Fastener & Flange Grades and Chemistry

C22 alloy, UNS N06022, is a nickel alloy with better overall corrosion resistance in oxidizing corrosives than C-276 and Inconel 625 alloys due to its 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). 

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, 17744 No. 2.4602 NiCr21Mo14W, NACE MR0175 ISO 15156, Werkstoff 2.4602

MECHANICAL PROPERTIES OF HASTELLOY

Hastelloy Corrosion Data

Hastelloy C22 Sulfuric Acid Corrosion Performance

Hastelloy C22 Hydrochloric Acid Corrosion Performance

Hastelloy C22 Nitric Acid Corrosion Performance

Hastelloy C22 Phosphoric Acid Corrosion Performance

Hastelloy B2 Fasteners & Flanges

A high performace nickel alloy used for severe corrosion environments

Hastelloy B2 fasteners and flanges are mostly utilized for their excellent resistance to reducing environments like hydrogen chloride gas, sulfuric, acetic and phosphoric acids. Like other Hastelloy alloys, B2 fasteners can be used in the as-welded condition because they resist the formation of grain-boundary carbide precipitates in the weld heat-affected zone. It is recommended that B2 fasteners not be utilized between 1000° F and 1600° F because of a reduction in the ductility. For the chemistry and specifications of Hastelloy B2 nickel alloy bolts, click here.

Availability: Hastelloy B2 fasteners are generally available in 1/2" sizes and larger due to materials availability. Most fasteners are made to order.

Corrosion Resistance

• Sulfuric Acid
• Hydrochloric Acid
• Phosphoric Acid

Key Benefits

• Excellent resistance to hydrochloric acid in all concentrations and temperatures, as well as a wide range of organic acids.
• Excellent resistance to pitting, stress corrosion cracking and to knife-line and heat-affected zone attack.
• Good resistance to pure sulfuric acid and a number of non-oxidizing acids.
• Poor corrosion resistance to oxidizing environments. B2 fasteners and flanges are not recommended for use in oxidizing media or in the presence of ferric or cupric salts. These salts may develop when hydrochloric acid comes in contact with iron and copper, causing premature corrosion failure.

Resources: Hastelloy Torque Spec, Flange Dimensions, Flange Bolting Chart

Hastelloy Fastener Types: Bolts, Nuts, Screws, Studs, Threaded Rods, Washers

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

 Hastelloy B2 Fastener & Flange Grades and Chemistry

B2 nickel 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. 

Hastelloy B2 Specifications: N10665, ASTM B619, 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, Werkstoff 2.4617

MECHANICAL PROPERTIES OF HASTELLOY

Hastelloy B2 Sulfuric Acid Corrosion Performance

Hastelloy B2 Hydrochloric Acid Corrosion Performance

Hastelloy B2 Phosphoric Acid Corrosion Performance

Hastelloy B3 Fasteners & Flanges

A high performace nickel alloy used for severe corrosion environments

Hastelloy B3 fasteners and flanges deliver the same excellent resistance to hydrochloric acid and other strongly reducing chemicals as other B-alloys (including B2) but with significantly enhanced thermal stability and improved ease of fabrication. In addition, B3 fasteners and flanges provide great resistance to knife-line and heat–affected zone attack. Like B2 alloy, B3 fasteners are not recommended for use in the presence of ferric or cupric salts which can cause rapid corrosion failure. See below for the specifications and chemistry of B3 nickel alloy fasteners.

Availability: Hastelloy B3 fasteners are generally available in 1/2" sizes and larger due to materials availability. Most B3 fasteners are made to order.

Corrosion Resistance

• Sulfuric Acid
• Hydrochloric Acid
• Phosphoric Acid
• Hydrobromic Acid

Key Benefits

• Excellent ductility during fluctuations to intermediate temperatures
• Excellent resistance to pitting, corrosion and stress-corrosion cracking
• Excellent resistance to knife-line and heat-affected zone attack

Resources: Hastelloy Torque Spec, Flange Dimensions, Flange Bolting Chart

Hastelloy Fastener Types: Bolts, Nuts, Screws, Studs, Threaded Rods, Washers

Flange Types Available: Blind Flanges, Lap Joint Flanges, Slip On Flanges, Socket Weld Flanges, Threaded Flanges, Weld Neck Flanges

Hastelloy B3 Fastener & Flange Grades & Chemistry

B3 nickel 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. 

Hastelloy B3 Specifications: N10675, ASTM B366, ASME SB366, 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, Werkstoff 2.4600

Hastelloy B3 Sulfuric Acid Corrosion Performance

Hastelloy B3 Hydrochloric Acid Corrosion Performance

Hastelloy B3 Phosphoric Acid Corrosion Performance

Hastelloy B3 Hydrobromic Acid Corrosion Performance