In high-consequence process environments containing severe oxidizing agents, chlorides, boiling organic acids, and wet chlorine gas, mechanical connection failure is never an option. Hastelloy C276 Hex Bolts (designated UNS N10276 and Werkstoff 2.4819) represent the premier fastener solution for extreme chemical processing, flue gas desulfurization (FGD), off-shore oil exploration, and pharmaceutical manufacturing.
Manufactured strictly in accordance with ASTM B574, ASME B18.2.1, and DIN 933 / DIN 931, Rajtilak Metal engineers Hastelloy C276 hex bolts designed to resist intergranular attack, stress corrosion cracking (SCC), and pitting in hot contaminated mineral acids. With complete Indian Boiler Regulations (IBR) and Engineers India Limited (EIL) approval, our forgings provide global EPC contractors and technical asset managers with complete mechanical integrity and absolute process safety.
Certified ISO 9001:2015 manufacturing facility based in Mumbai, India, delivering verified Hastelloy C276 fasteners to ADNOC, SABIC, and North American Tier-1 energy projects.
Match your specific joint geometry, pressure envelope, and vibration conditions with precision-manufactured Alloy C276 fasteners produced using hot-forging and high-precision CNC single-point threading.
Engineered for high-pressure pipeline flanges (ASME B16.5 & B16.47) and thick-wall pressure vessel blind flanges. The wider across-flats dimension distributes critical bolt pre-loads safely across composite and metallic gaskets.
Precision full-body threaded hex tap screws ideal for tapped holes in reactor jackets, agitator nozzles, and sulfuric acid pumping casings where space constraints prevent the use of standard nuts.
Featuring an unthreaded cylindrical shank under the head to carry high sheer forces across mating flange faces while maintaining controlled elongation and elastic clamp force under fluctuating thermal cycles.
In-depth market insights for Chief Procurement Officers, Supply Chain Directors, and EPC Engineering Heads navigating raw nickel volatility and increasing purity mandates.
Industrial procurement for nickel superalloy fasteners is undergoing a foundational transition driven by three macroeconomic catalysts:
The operational lifecycle of Hastelloy C276 hex bolts is being extended through several metallurgical and mechanical advancements:
Engineering cross-reference data to verify that line-item requirements comply with ASTM B574, ASME SB574, and international valve and piping design codes.
| Element / Property | Composition Limit (ASTM B574) | Mechanical Parameter | Guaranteed Value (Room Temp) |
|---|---|---|---|
| Nickel (Ni) | 57.0% min (Balance) | Tensile Strength (Rm) | ≥ 100,000 psi (690 MPa) |
| Molybdenum (Mo) | 15.0 – 17.0% | Yield Strength (0.2% Offset) | ≥ 41,000 psi (283 MPa) |
| Chromium (Cr) | 14.5 – 16.5% | Elongation (% in 2 inches) | ≥ 40.0% |
| Iron (Fe) | 4.0 – 7.0% | Hardness (Rockwell B / C) | ≤ 100 HRB or ≤ 25-30 HRC |
| Tungsten (W) | 3.0 – 4.5% | Density | 8.89 g/cm³ (0.321 lb/in³) |
| Cobalt (Co) | ≤ 2.50% max | Melting Point Range | 1325°C – 1370°C (2415°F – 2500°F) |
| Manganese (Mn) | ≤ 1.00% max | Pitting Resistance Equivalent (PREN) | ≥ 68 (Unrivaled Chloride Pitting Immunity) |
| Carbon (C) | ≤ 0.010% max (Ultra-low) | Charpy V-Notch Impact (Cryogenic) | ≥ 150 J at -196°C |
At Rajtilak Metal, precision manufacturing of Hastelloy C276 hex head bolts follows an unyielding quality inspection regime. Because these bolts are destined for lethal service environments, zero material variance is tolerated.
Every individual bolt undergoes non-destructive and destructive testing inside our Mumbai laboratory. Stamped with our registered manufacturer's trademark, material grade (C276), dimension standard, and raw material heat code, our bolts link directly to certified mill test reports detailing complete chemistry and elongation data.
Vacuum Induction Melted (VIM) / ESR ingots from qualified global steel mills.
Induction controlled hot-forging followed by CNC continuous shank threading.
1121°C heating cycle with rapid de-scaling and water bath quench.
100% handheld PMI inspection, micro-hardness surveys, and EN 10204 3.1 MTC issue.
Rajtilak Metal is officially approved by Engineers India Limited (EIL) and the Indian Boiler Regulations (IBR). Our production workflows meet the most stringent specifications required by national oil companies and global petrochemical consortia.
Equipped with 11 advanced internal testing systems including Optical Emission Spectrometers (OES), Thermo Scientific portable XRF analyzers for 100% PMI testing, Charpy V-notch impact machines, and optical profile projectors for thread accuracy.
Operating continuously since 1991 from Opera House, Mumbai, our dedicated logistics wing delivers expedited seaworthy packing, customs clearance, and prompt shipping to ports across the UAE, Saudi Arabia, Europe, and the Americas.
Whether procuring standard ASTM B574 hex bolts or specialized custom-machined fasteners according to project blueprints, Rajtilak Metal ensures competitive direct-factory pricing, certified alloy chemistry, and dependable delivery timeframes for global plant turnarounds and capital projects.
Where lesser austenitic stainless steels (316L, 904L) and standard nickel alloys fail due to chloride pitting, stress corrosion cracking, or rapid acid thinning.
Direct technical answers reflecting real engineering evaluations, NACE corrosion limits, and global fastener procurement practices.