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The Hastelloy B3 Nut is a premium hexagonal nut engineered from Hastelloy B3 alloy (UNS N10675, W.Nr 2.4600)—a nickel-molybdenum alloy renowned for its exceptional resistance to strong reducing acids (e.g., hydrochloric acid) and high temperatures. Compliant with DIN934, ISO4032, and ASME B18.2.2 standards, this nut is designed to pair with Hastelloy B3 bolts, studs, or threaded rods, creating a fully corrosion-resistant fastening system. As experts in Hastelloy fasteners, we produce a full range of B3 components (hex bolts, washers, studs) and have supplied to critical industries: nuclear power plants, fine chemical facilities, and chlorination systems. With stock quantities up to 1,000,000 pieces and EN10204-3.1B certification, we meet both urgent repairs and large-scale project needs, offering custom OEM solutions for non-standard sizes.
Superior Acid Resistance: Hastelloy B3 contains 27–32% molybdenum and ≥65% nickel, making it nearly immune to reducing acids (hydrochloric, sulfuric) at moderate temperatures. Unlike stainless steels, it does not develop “pitting” or “crevice corrosion” in concentrated acid environments—critical for chemical processing.
High-Temperature Stability: Operates reliably at temperatures up to 1418°C (melting point range: 1370–1418°C) and retains mechanical strength at elevated temperatures (e.g., 600°C in reactors). This makes it suitable for high-heat applications like nuclear power plant steam systems.
Global Standard Compliance: Manufactured to DIN934 (metric hex nuts), ISO4032 (precision hex nuts), and ASME B18.2.2 (imperial hex nuts), ensuring perfect compatibility with matching Hastelloy B3 fasteners. Threads feature tight tolerances to prevent seepage in sealed systems.
Full Material Traceability: Every nut comes with EN10204-3.1B certification, documenting material origin, chemical composition (Ni:≥65%, Mo:27–32%, Cr:1–3%), and mechanical properties (Grade 80 strength). This meets the strict traceability requirements of nuclear and aerospace industries.
Customizable & Versatile: Supports custom markings (e.g., “Hastelloy B3” + your part number) for easy identification. We also produce non-standard sizes (beyond M5–M64) via OEM, including thickened nuts for heavy-load applications or fine-thread nuts for precision equipment.
The Hastelloy B3 Nut’s acid and high-temperature resistance makes it indispensable in extreme industrial environments:
Nuclear Power Plants: Used in reactor cores, coolant systems, and steam generators. It secures critical components (e.g., heat exchanger tubes, valve bodies) against radioactive coolants and high temperatures, ensuring plant safety and reliability.
Fine Chemical Industry: Applied in pharmaceutical and specialty chemical plants, where it fastens reactors and storage tanks handling hydrochloric acid, formic acid, or acetic anhydride. The nut’s acid resistance prevents contamination of sensitive products.
Chlorination Systems: Integrated into water treatment plants (chlorine injection systems) and pulp/paper mills (bleaching processes). It resists chlorine gas and hypochlorite solutions, avoiding nut degradation and system leaks.
Petrochemical Refineries: Used in hydrocracking units and acid gas removal systems. Hastelloy B3 withstands the harsh mix of hydrocarbons, hydrogen sulfide, and acids, maintaining fastening integrity in high-pressure, high-temperature conditions.
A1: Hastelloy B3 is an improved version of B2: it has lower carbon content (<0.01% vs. <0.02% in B2) and optimized impurities, reducing the risk of “ductility loss” (brittleness) after long-term use at high temperatures. For applications above 600°C (e.g., nuclear reactors), B3 is more reliable than B2.
A2: Yes. We offer “fastener kits” including Hastelloy B3 nuts, bolts, and flat washers (also made of Hastelloy B3). These kits are pre-tested for compatibility and delivered ready for installation, saving you time on sourcing individual components.
A3: For standard sizes (M5–M24), we can fulfill 100,000 pieces within 4–6 weeks (thanks to raw material stock). For larger sizes (M27–M64) or custom designs, lead times extend to 6–8 weeks, with regular production updates provided.
A4: We do not recommend it. Pairing Hastelloy B3 (high nickel-molybdenum) with SS316 (lower corrosion resistance) creates a “galvanic couple,” accelerating corrosion of the SS316 bolt. For maximum performance, always pair B3 nuts with B3 bolts/studs.
A5: Yes. Upon request, we can arrange testing by independent labs (e.g., SGS, BV) for chemical composition, mechanical properties (tensile strength, hardness), and corrosion resistance (salt spray, acid immersion). These reports add 1–2 weeks to delivery but confirm compliance with your industry’s standards.
B3 Nut
Name | Hastelloy B3 Hex nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Hastelloy B3/N10675/2.4600 |
Grade | Grade 80 |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
| Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
Similar brand
UNS | Trademark | W.Nr |
| N10675 | HastelloyB3 | 2.4600 |
Chemical composition of Hastelloy B-3 nut made of Hastelloy alloy
| Alloy | % | Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S | Cu | AL | Ti | Nb | Ta | Tr | NiMo |
| Hastelloy B-3 | Min. | ≥ | 1 | 27 | 1 | |||||||||||||||
| Min. | 65 | 3 | 32 | 3 | 3 | 3 | 0.01 | 3 | 0.1 | 0.1 | 0.03 | 0.1 | 0.2 | 0.5 | 0.2 | 0.2 | 0.02 | 0.1 | 98 |
Physical Properties of Hastelloy B-3 Nut Made of Hastelloy Alloy
Density | 9.24g/cm3 |
| Melting point | 1370-1418 ºC |
The Hastelloy B3 Nut is a premium hexagonal nut engineered from Hastelloy B3 alloy (UNS N10675, W.Nr 2.4600)—a nickel-molybdenum alloy renowned for its exceptional resistance to strong reducing acids (e.g., hydrochloric acid) and high temperatures. Compliant with DIN934, ISO4032, and ASME B18.2.2 standards, this nut is designed to pair with Hastelloy B3 bolts, studs, or threaded rods, creating a fully corrosion-resistant fastening system. As experts in Hastelloy fasteners, we produce a full range of B3 components (hex bolts, washers, studs) and have supplied to critical industries: nuclear power plants, fine chemical facilities, and chlorination systems. With stock quantities up to 1,000,000 pieces and EN10204-3.1B certification, we meet both urgent repairs and large-scale project needs, offering custom OEM solutions for non-standard sizes.
Superior Acid Resistance: Hastelloy B3 contains 27–32% molybdenum and ≥65% nickel, making it nearly immune to reducing acids (hydrochloric, sulfuric) at moderate temperatures. Unlike stainless steels, it does not develop “pitting” or “crevice corrosion” in concentrated acid environments—critical for chemical processing.
High-Temperature Stability: Operates reliably at temperatures up to 1418°C (melting point range: 1370–1418°C) and retains mechanical strength at elevated temperatures (e.g., 600°C in reactors). This makes it suitable for high-heat applications like nuclear power plant steam systems.
Global Standard Compliance: Manufactured to DIN934 (metric hex nuts), ISO4032 (precision hex nuts), and ASME B18.2.2 (imperial hex nuts), ensuring perfect compatibility with matching Hastelloy B3 fasteners. Threads feature tight tolerances to prevent seepage in sealed systems.
Full Material Traceability: Every nut comes with EN10204-3.1B certification, documenting material origin, chemical composition (Ni:≥65%, Mo:27–32%, Cr:1–3%), and mechanical properties (Grade 80 strength). This meets the strict traceability requirements of nuclear and aerospace industries.
Customizable & Versatile: Supports custom markings (e.g., “Hastelloy B3” + your part number) for easy identification. We also produce non-standard sizes (beyond M5–M64) via OEM, including thickened nuts for heavy-load applications or fine-thread nuts for precision equipment.
The Hastelloy B3 Nut’s acid and high-temperature resistance makes it indispensable in extreme industrial environments:
Nuclear Power Plants: Used in reactor cores, coolant systems, and steam generators. It secures critical components (e.g., heat exchanger tubes, valve bodies) against radioactive coolants and high temperatures, ensuring plant safety and reliability.
Fine Chemical Industry: Applied in pharmaceutical and specialty chemical plants, where it fastens reactors and storage tanks handling hydrochloric acid, formic acid, or acetic anhydride. The nut’s acid resistance prevents contamination of sensitive products.
Chlorination Systems: Integrated into water treatment plants (chlorine injection systems) and pulp/paper mills (bleaching processes). It resists chlorine gas and hypochlorite solutions, avoiding nut degradation and system leaks.
Petrochemical Refineries: Used in hydrocracking units and acid gas removal systems. Hastelloy B3 withstands the harsh mix of hydrocarbons, hydrogen sulfide, and acids, maintaining fastening integrity in high-pressure, high-temperature conditions.
A1: Hastelloy B3 is an improved version of B2: it has lower carbon content (<0.01% vs. <0.02% in B2) and optimized impurities, reducing the risk of “ductility loss” (brittleness) after long-term use at high temperatures. For applications above 600°C (e.g., nuclear reactors), B3 is more reliable than B2.
A2: Yes. We offer “fastener kits” including Hastelloy B3 nuts, bolts, and flat washers (also made of Hastelloy B3). These kits are pre-tested for compatibility and delivered ready for installation, saving you time on sourcing individual components.
A3: For standard sizes (M5–M24), we can fulfill 100,000 pieces within 4–6 weeks (thanks to raw material stock). For larger sizes (M27–M64) or custom designs, lead times extend to 6–8 weeks, with regular production updates provided.
A4: We do not recommend it. Pairing Hastelloy B3 (high nickel-molybdenum) with SS316 (lower corrosion resistance) creates a “galvanic couple,” accelerating corrosion of the SS316 bolt. For maximum performance, always pair B3 nuts with B3 bolts/studs.
A5: Yes. Upon request, we can arrange testing by independent labs (e.g., SGS, BV) for chemical composition, mechanical properties (tensile strength, hardness), and corrosion resistance (salt spray, acid immersion). These reports add 1–2 weeks to delivery but confirm compliance with your industry’s standards.
B3 Nut
Name | Hastelloy B3 Hex nut |
Standard | DIN934,ISO4032,ASME B18.2.2 |
Size Range | M5-M64 or non-standard as requested |
Finish | Bright&Clean |
Marking | HT&FST or customization |
Material | Hastelloy B3/N10675/2.4600 |
Grade | Grade 80 |
Certificates | EN10204-3.1B |
Non-standards | OEM is available, according to drawing or samples |
Samples | Samples available |
| Package | Bulk in box and then in cartons, then on pallets, or according to customers' requirement. |
| Payment | T/T,Western Union |
Similar brand
UNS | Trademark | W.Nr |
| N10675 | HastelloyB3 | 2.4600 |
Chemical composition of Hastelloy B-3 nut made of Hastelloy alloy
| Alloy | % | Ni | Cr | Mo | Fe | W | Co | C | Mn | Si | V | P | S | Cu | AL | Ti | Nb | Ta | Tr | NiMo |
| Hastelloy B-3 | Min. | ≥ | 1 | 27 | 1 | |||||||||||||||
| Min. | 65 | 3 | 32 | 3 | 3 | 3 | 0.01 | 3 | 0.1 | 0.1 | 0.03 | 0.1 | 0.2 | 0.5 | 0.2 | 0.2 | 0.02 | 0.1 | 98 |
Physical Properties of Hastelloy B-3 Nut Made of Hastelloy Alloy
Density | 9.24g/cm3 |
| Melting point | 1370-1418 ºC |
