ASTM B446 / ASME SB446 | UNS N06625 | Werkstoff Nr. 2.4856 | Sizes 3 mm to 800 mm
Unifit Fastener manufactures, stocks, and exports Inconel 625 Round Bar (ASTM B446 / UNS N06625) in diameters from 3 mm to 800 mm from its Mumbai warehouse with in-house NDT, EN 10204 3.1 / 3.2 MTCs, and dispatch within 5 business days on standard diameters. A nickel-chromium-molybdenum superalloy strengthened with niobium and tantalum, Inconel 625 is essential to marine engineering, chemical processing, aerospace, nuclear and offshore oil & gas industries for its unrivalled corrosion resistance, outstanding fatigue strength and impressive performance under both cryogenic and high temperature conditions.
Our Alloy 625 Round Bars are precision forged according to strict international quality control with the options of cold drawn, hot rolled, annealed, forged, bright polished. Unifit Fastener has an extensive in-house stock, competitive pricing and can process customized ‘cut to length' orders, which helps them to offer faster turnaround to their clients across India and export to USA, Europe, UAE, Singapore, Malaysia, Australia and beyond. All bars supplied are third party tested in government approved laboratories with full material test certificates (MTC), EN 10204 3.1 and 3.2 reports and NDT certificates.
You can count on Unifit Fastener to have the inventory, expertise and quality certifications on-hand to meet your exact requirements, whether you need a standard Inconel 625 hex bar, a large diameter forged round bar, or precision ground bright bars. Call us today for a free quote or sample.
Request a Quote| Parameter | Details |
| Material Grade | Inconel 625 | Alloy 625 | Nickel Alloy 625 |
| UNS Designation | N06625 |
| Werkstoff Nr. | 2.4856 |
| Standard Specification | ASTM B446 / ASME SB446 |
| International Standards | AMS 5666, AMS 5837, EN 10095, VdTÜV 499, ISO 9723, BS 3076 NA21, DIN 17752 |
| Available Forms | Round Bar, Hex Bar, Flat Bar, Square Bar, Forged Bar, Bright Bar, Cold Drawn Bar, PSQ Bar, Hollow Bar, Wire Rod, Billet, Ingot |
| Round Bar Diameter | 3 mm to 800 mm |
| Hex Bar Size (A/F) | 2 mm to 100 mm |
| Flat Bar Thickness | 2 mm to 100 mm | Width: 10 mm to 500 mm |
| Square Bar Size | 4 mm to 100 mm |
| Length Range | 100 mm to 6000 mm (Long & Above, Custom Available) |
| Manufacturing Process | Cold Drawn, Hot Rolled, Forged, Extruded |
| Surface Finish | Bright, Black, Polished, Pickled, Hot Rolled, Cold Drawn, Mirror, Hairline, Sand Blasted |
| Tolerance | H5, H6, H7, H8, H9, H10, H11, H12, K9, K10, K11, K12 or as per client spec |
| Condition | Annealed, Hardened & Tempered, Cold Worked, Precipitation Hardened (PH) |
| Packaging | Wooden pallets / Wooden cases / Plastic Bags |
The precise chemical makeup of Inconel 625 is what defines its exceptional corrosion resistance and mechanical strength. The high molybdenum content, combined with niobium, creates a solid-solution strengthening effect — eliminating the need for heat treatment to achieve superior performance.
| Element | Symbol | Min % | Max % | Role |
| Nickel | Ni | 58.00 | Balance | Base element; corrosion resistance |
| Chromium | Cr | 20.00 | 23.00 | Oxidation & corrosion resistance |
| Molybdenum | Mo | 8.00 | 10.00 | Pitting & crevice corrosion resistance |
| Niobium + Tantalum | Nb+Ta | 3.15 | 4.15 | Solid solution strengthening |
| Iron | Fe | – | 5.00 max | Structural support |
| Cobalt | Co | – | 1.00 max | High-temp stability |
| Carbon | C | – | 0.10 max | Hardness control |
| Manganese | Mn | – | 0.50 max | Deoxidation |
| Silicon | Si | – | 0.50 max | Oxidation resistance |
| Aluminium | Al | – | 0.40 max | Oxidation resistance |
| Titanium | Ti | – | 0.40 max | Grain stability |
| Phosphorus | P | – | 0.015 max | Impurity control |
| Sulphur | S | – | 0.015 max | Impurity control |
| Condition | Tensile Strength (min) | Yield Strength 0.2% (min) | Elongation % (min) |
| Annealed, up to 4" (102 mm) | 120 ksi / 827 MPa | 60 ksi / 414 MPa | 30% |
| Annealed, over 4"–10" (102–254 mm) | 110 ksi / 758 MPa | 50 ksi / 345 MPa | 25% |
| Property | Value | Unit | Min | Max |
| Tensile Strength | 930 | MPa | 827 | 1035 |
| Yield Strength (0.2% offset) | 517 | MPa | 414 | 690 |
| Elongation | 42.5 | % | 25 | 50 |
| Hardness (typical) | 220 | BHN | – | – |
| Density | 8.44 | g/cm³ | – | – |
| Melting Point | 1290 – 1350 | °C | – | – |
| Elastic Modulus | 207 | GPa | – | – |
| Physical Property | Value |
| Density | 8.44 g/cm³ (0.305 lb/in³) |
| Melting Point | 1290°C – 1350°C (2350°F – 2460°F) |
| Heat Capacity | 460 J/kg·°K |
| Electrical Resistivity at 21°C | 128.9 microhm-cm |
| Thermal Conductivity at 21°C | 9.9 W/m·K |
| Coefficient of Thermal Expansion | 12.8 µm/m·°C (at 93°C) |
| Modulus of Elasticity | 207 GPa |
Inconel 625 is recognized under multiple international designations. Below is a comprehensive equivalence table for procurement reference:
| Standard | UNS | EN / DIN | GOST | JIS / Japan | BS / UK | Trade Name |
| ASTM/ASME | N06625 | NiCr22Mo9Nb / 2.4856 | XH75M5TIO | NCF 625 | BS NA 21 | Inconel 625 |
| AMS | N06625 | – | – | – | – | Alloy 625 |
| ISO / VdTÜV | N06625 | EN 10095 | – | – | – | Chormin 625 |
Use the weight chart below for material planning, procurement, and cost estimation. Weight values are approximate for solid bars.
| Diameter | Kg / Mtr | Diameter | Kg / Mtr | Diameter | Kg / Mtr |
| 3 mm | 0.0055 | 20 mm | 2.047 | 50 mm | – |
| 5 mm | 0.0154 | 25 mm | 3.087 | 65 mm | – |
| 8 mm | 0.0398 | 30 mm | 5.0548 | 75 mm | – |
| 10 mm | 0.0620 | 32 mm | 6.0314 | 100 mm | – |
| 12 mm | 0.0889 | 35 mm | 7.0553 | 150 mm | – |
| 16 mm | 1.0578 | 38 mm | 8.0903 | 200 mm | – |
| 18 mm | 2.0001 | 40 mm | 9.0872 | 250 mm | – |
Formula Used: Kg/m = (π/4 × d² × 8.44 × 10-3) Where d = Diameter in mm and density = 8.44 g/cm³. This format keeps all three Diameter/Kg-Mtr column pairs aligned and prevents the table from appearing truncated on the webpage.
Pricing for Inconel 625 bars varies based on size, form, finish, quantity, and market conditions. The indicative price ranges below are provided for budgetary reference. Contact Unifit Fastener for current negotiated pricing and bulk discounts.
| Product Description | Price Range (FOB) | Unit |
| Inconel 625 Round Bar (Hot Worked, Annealed, Pickled) | USD 1,200 – 960 | Per Ton |
| Nickel Alloy 625 Round Bar (Bolt & Nut Grade) | USD 20 – 30 | Per Kg |
| Inconel 625 Round Bar (Fastener Grade) | USD 20 – 30 | Per Kg |
| Alloy 625 Forging Special Steel Bar | USD 800 – 1,500 | Per Ton |
| ASTM B446 Inconel 625 Round Bar | USD 16 – 25 | Per Kg |
| High Quality Hot Rolled Inconel 625 Bar | USD 20 – 30 | Per Kg |
| Inconel 625 Bright Bar (Dia 50 mm – 76 mm, Forged) | USD 18 – 21 | Per Kg |
| Cold Drawn Standard Inconel 625 Round Bar | USD 100 – 3,000 | Per Ton |
| Inconel 625 Nickel Alloy Round Bar (Large Dia) | USD 300 – 800 | Per Ton |
Call Unifit Fastener for real-time pricing, volume discounts, and fastest dispatch from our Mumbai stockyard.
The versatility of Inconel 625 makes it the material of choice across the world's most demanding industries. Its immunity to chloride-induced stress corrosion cracking, combined with excellent weldability and brazeability, enables use in environments where most alloys fail.
| Industry | Typical Application of Inconel 625 Round Bar |
| Oil & Gas / Offshore | Wellhead components, risers, manifolds, sour gas service, subsea equipment |
| Marine Engineering | Seawater desalination equipment, submarine propellers, propulsion systems |
| Chemical Processing | Reactor vessels, heat exchangers, distillation columns, pump shafts |
| Aerospace & Defense | Jet engine components, fuel nozzles, combustion liners, exhaust systems |
| Nuclear Industry | Reactor core components, spent fuel storage, pressurizer heater sleeves |
| Power Generation | Steam turbine components, flue gas desulfurization, bellows |
| Environmental Control | Flare stacks, scrubbers, pollution control equipment |
| Food & Pharmaceutical | Process equipment exposed to aggressive cleaning agents |
| Feature | Benefit |
| Exceptional Corrosion Resistance | Performs reliably in seawater, acids, alkalis, and highly oxidizing environments |
| Chloride Stress Corrosion Immunity | Prevents cracking failures in marine, offshore, and chloride-rich chemical environments |
| No Heat Treatment Required | Molybdenum + niobium provide solid-solution strengthening without aging — reduces processing time |
| Outstanding Fatigue Strength | Withstands high-cycle loading in rotating and vibrating components |
| Wide Temperature Range | Maintains properties from cryogenic –196°C to elevated 980°C — one alloy for extreme environments |
| Excellent Weldability | Compatible with most welding processes; no post-weld heat treatment needed in most applications |
| Crevice & Pitting Resistance | High Molybdenum (8–10%) content protects against localized corrosion attack |
| Long Service Life | Rated AMS 5837 bar life span of 50 years in standard service conditions |
Choosing the right nickel alloy is critical for long-term performance. The table below helps engineers select the best material for their application:
| Property | Inconel 625 | Inconel 718 | Inconel 600 | Hastelloy C276 |
| UNS No. | N06625 | N07718 | N06600 | N10276 |
| Ni Content | 58% min | 50–55% | 72% min | 57% min |
| Mo Content | 8–10% | 2.8–3.3% | – | 15–17% |
| Corrosion Resistance | Excellent | Good to Excellent (NACE MR0175 Compliant) | Good | Excellent |
| High Temp Strength | Very High | Highest | Moderate | High |
| Weldability | Excellent | Good | Good | Excellent |
| Max Temp Use (°C) | 980 | 700 (aged) | 1000 | 1040 |
| Typical Use | Marine/Chemical | Aerospace | Industrial | Chemical/Pharma |
| Price Level | Moderate-High | High | Moderate | High |
Unifit Fastener operates under rigorous quality management systems and is committed to delivering only certified, fully traceable Inconel 625 bars.
| Certification / Standard | Scope |
| ISO 9001:2015 | Quality Management System |
| ISO 14001 | Environmental Management |
| ISO 45001 (OHSAS 18001) | Occupational Health & Safety |
| PED 2014/68/EU Certified | European Pressure Equipment Directive |
| EN 10204 3.1 MTC | Mill Test Certificate from accredited lab |
| EN 10204 3.2 MTC | Third-party inspection certificate |
| NDT Test Certificates | Ultrasonic / Radiographic / Dye Penetrant |
| Govt. of India Recognized Export House | Verified exporter status |
| ASTM / ASME / AMS | Material conformance testing per standard |
Unifit Fastener is a manufacturer, supplier, and exporter of Inconel 625 Round Bar in various sizes and specifications. The bars are produced in accordance with ASTM B446 / ASME SB446 and UNS N06625 standards.
Inconel 625 is used in aerospace, marine, chemical processing, oil and gas, and power generation industries. It is preferred for applications requiring excellent corrosion resistance, high strength, and performance at elevated temperatures.
There is no technical difference — both terms refer to the same nickel-chromium-molybdenum superalloy with UNS N06625 designation. 'Inconel 625' is the registered trade name by Special Metals Corporation, while 'Alloy 625' or 'Nickel Alloy 625' are the generic names used in engineering specifications.
Inconel 625 Round Bar are produced under ASTM B446 (rod, bar, and wire) and ASME SB446 for pressure vessel applications. Forgings are covered under ASTM B564, and plates/sheets under ASTM B443. Additional international standards include AMS 5666 (bars), AMS 5837 (wire), EN 10095, VdTÜV 499, ISO 9723, and BS 3076 NA21.
Forged round bars and hex bars can be produced up to 420 inches in length with a maximum weight of 20,000 pounds (approximately 9,072 kg). Flat bars reach up to 220 inches with a maximum weight of 15,000 pounds. Please contact Unifit Fastener for lead time on large forged bars.