Inconel 625 Round Bars Manufacturer, Supplier & Exporter in India
Jade Alloys is a certified manufacturer, supplier and exporter of Inconel 625 Round Bars, the industry’s most versatile nickel superalloy for corrosion-critical service. Engineered as a nickel-chromium-molybdenum-niobium (Ni-Cr-Mo-Nb) alloy, Inconel 625 achieves exceptional strength through solid-solution hardening, eliminating the need for heat treatment while delivering outstanding weldability and resistance to an unusually wide range of corrosive environments.
Our Alloy 625 Round Bar meets the ASTM B446 / ASME SB446 standard, and is also supplied to the DIN 2.4856 / Werkstoff Nr. 2.4856, AMS 5666, BS 3076 NA21, ISO 9723 and EN 10095 specifications. All bars are supplied from our works with a full certificate of material traceability (EN10204 3.1 Mill) from the original heat to the finished product.
We have very good stocks of all sizes from 3mm to 800mm diameter in round, hex, flat, square, annealed, hot-finished or cold-drawn bar, cut to length or not. Jade Alloys has a broad export reach, reaching 40+ countries and with consistent quality and reliable lead times, the company supplies procurement teams of oil and gas sector, chemical processing, marine, aerospace and power generation sectors.
Inconel 625 Round Bar Types & Bar Forms Available
| Bar Form | Size Range | Standard Lengths | Tolerance Class | Typical Finish |
|---|---|---|---|---|
| Round Bar | 3 mm – 800 mm dia | 3 m, 6 m, or cut-to-length | H8–H13 / K9–K12 (ISO 286) | Bright, Black, Pickled, Polished |
| Hex Bar (A/F) | 3 mm – 180 mm A/F | 0.5 m – 6 m | H11 / H12 | Bright / Black |
| Flat Bar | W: 1.5–250 mm, T: 0.5–200 mm | 0.5 m – 6 m | Per ISO 286 / client spec | Bright / Pickled |
| Square Bar | 2 mm – 200 mm | 0.5 m – 6 m | H11 / H12 | Bright / Black |
| Bright Bar | 3 mm – 250 mm dia | 0.5 m – 6 m | H8 / H9 (tight tolerance) | Cold Drawn & Polished |
| Forged Round Bar | 100 mm – 800 mm dia | Custom lengths | Rough Turned / Peeled | Turned & Peeled |
Inconel 625 Cold Drawn Bright Bar
Cold drawn bright bars are produced by drawing hot-rolled billets through precision dies, resulting in a smooth, bright surface finish with close dimensional tolerances (H8/H9). The cold-drawing process also provides a modest increase in yield and tensile strength compared to annealed bar. Typical applications include precision-turned components, pump shafts, fastener blanks, and instrumentation parts where dimensional accuracy and surface quality are critical.
Inconel 625 Forged Round Bar (Large Diameter)
For diameters above 250 mm, Jade Alloys supplies Inconel 625 as forged and rough-turned bar. The forging process refines the grain structure, eliminating the porosity and segregation associated with cast bar, and delivers improved through-thickness mechanical properties. Large-diameter forged bars are used for pressure vessel nozzles, valve bodies, pump casings, and offshore structural components. All forged bars are ultrasonically tested per ASTM A388 or equivalent before dispatch.
Inconel 625 Hex Bar & Flat Bar
Hex bars are stocked for fastener and machined-component applications where the hex profile eliminates secondary milling operations. Flat bars are used in fabricated structures, baffle plates, heat exchanger tie-rods, and cladding applications. Both forms are available in bright drawn or pickled condition.
Inconel 625 Round Bar Standard Specifications & Grades
Procurement engineers specify Inconel 625 bar under different standards depending on industry and geography. The table below maps every applicable specification to its scope, enabling direct cross-referencing against purchase order requirements.
| Standard | Issuing Body | Scope | Typical Condition |
|---|---|---|---|
| ASTM B446 | ASTM International (USA) | Rod and Bar — primary commercial spec | Annealed / Hot-Finished / Cold-Drawn |
| ASME SB446 | ASME (USA) | Pressure vessel / boiler equivalent of ASTM B446 | Annealed |
| AMS 5666 | SAE International (Aerospace) | Bar, Forging Stock, Ring — aerospace procurement spec | Annealed |
| DIN 17752 | DIN (Germany / EU) | Bar and Rod — European designation | Bright / Black |
| ISO 9723 | ISO | Nickel alloy bar and rod — international | All conditions |
| EN 10095 | CEN (Europe) | Heat-resistant nickel alloy bar and strip | Annealed |
| BS 3076 NA21 | BSI (United Kingdom) | British Standard nickel alloy bar | Annealed |
| VdTUV 499 | VdTUV (Germany) | German pressure vessel material approval | Material approval |
| ASME Code Case 1935 | ASME | Special approval for high-temperature applications | N/A |
UNS N06625 — Grade Identification
- UNS Designation: N06625
- Werkstoff Nr.: 2.4856
- Trade Name: INCONEL® Alloy 625
- Generic Name: Nickel-Chromium-Molybdenum-Columbium Alloy
Note: ‘Inconel’ is a registered trademark of Special Metals Corporation (now Precision Castparts Corp). When ordering, specify the alloy by UNS N06625 / ASTM B446 to ensure equivalent material from any approved mill. Jade Alloys sources from mills holding the applicable ASTM/ASME and AMS approvals.
Chemical Composition of Inconel 625 Round Bar (ASTM B446)
Inconel 625 is a nickel-base alloy whose corrosion resistance and strength arise from the combination of high chromium (for oxidation resistance), molybdenum (for pitting and crevice corrosion resistance), and niobium (for solid-solution strengthening and sensitization resistance). Understanding the composition explains why this alloy outperforms stainless steels and other nickel alloys in the most aggressive service environments.
| Nickel (Ni) | Chromium (Cr) | Molybdenum (Mo) | Niobium + Tantalum (Nb+Ta) | Iron (Fe) | Carbon (C) | Manganese (Mn) | Silicon (Si) | Cobalt (Co) | Aluminium (Al) | Titanium (Ti) | Phosphorus (P) | Sulfur (S) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 58.00% Min | 20.00–23.00% | 8.00–10.00% | 3.15–4.15% | 5.00% Max | 0.10% Max | 0.50% Max | 0.50% Max | 1.00% Max | 0.40% Max | 0.40% Max | 0.015% Max | 0.015% Max |
Why Niobium (Nb) matters: Unlike most austenitic stainless steels, Inconel 625 achieves its high strength without any precipitation-hardening heat treatment. The niobium content stabilises the matrix through solid-solution hardening, providing a minimum yield strength of 517 MPa directly in the annealed condition. Equally important, the controlled Nb content prevents the formation of chromium carbides at grain boundaries during welding or elevated-temperature service — the mechanism that causes sensitisation and intergranular corrosion in unstabilised alloys like 304/316 stainless steel. This makes Inconel 625 one of the few high-strength alloys that can be welded without post-weld heat treatment and still maintain full corrosion performance in the as-welded zone.
Mechanical Properties of Inconel 625 Round Bar (Annealed, ASTM B446)
| Property | Value | Unit | Condition |
|---|---|---|---|
| Tensile Strength (minimum) | 930 | MPa (135,000 psi) | Annealed per ASTM B446 |
| Yield Strength 0.2% Offset (min.) | 517 | MPa (75,000 psi) | Annealed per ASTM B446 |
| Elongation in 50 mm (minimum) | 30 | % | Annealed per ASTM B446 |
| Reduction of Area (typical) | 50 | % | Annealed |
| Brinell Hardness (typical max.) | ≤ 290 | HBW | Annealed |
| Rockwell Hardness (typical) | ≤ 97 | HRB | Annealed |
| Modulus of Elasticity (20°C) | 207 | GPa | — |
| Fatigue Strength (10⁸ cycles) | 345 | MPa | R.R. Moore rotating beam |
| Charpy Impact Energy (−196°C) | > 100 | J | Good cryogenic toughness |
Elevated Temperature Tensile Properties
One of Inconel 625’s defining advantages over ferritic and austenitic stainless steels is its strength retention at elevated temperatures. The table below shows typical tensile strength values at increasing temperatures — critical data for pressure vessel, heat exchanger, and fired-heater design calculations.
| Temperature | Tensile Strength | Yield Strength (0.2%) | Elongation |
|---|---|---|---|
| Room Temp (21°C) | ~965 MPa | ~515 MPa | ~45% |
| 260°C (500°F) | ~910 MPa | ~455 MPa | ~40% |
| 425°C (800°F) | ~862 MPa | ~414 MPa | ~38% |
| 540°C (1000°F) | ~807 MPa | ~372 MPa | ~38% |
| 650°C (1200°F) | ~745 MPa | ~345 MPa | ~40% |
| 760°C (1400°F) | ~655 MPa | ~310 MPa | ~45% |
| 870°C (1600°F) | ~448 MPa | ~255 MPa | ~55% |
| 980°C (1800°F) | ~234 MPa | ~165 MPa | ~75% |
Physical & Thermal Properties of Alloy 625 Bar
| Property | Value at 21°C | Value at Elevated Temp. | Unit |
|---|---|---|---|
| Density | 8.44 | — | g/cm³ |
| Melting Range (Solidus) | 1,290 | — | °C |
| Melting Range (Liquidus) | 1,350 | — | °C |
| Specific Heat | 410 | 481 (at 538°C) | J/kg·°C |
| Thermal Conductivity | 9.8 | 15.8 (at 538°C) | W/m·°C |
| Mean CTE (21–100°C) | 12.8 | 13.5 (21–538°C) | µm/m·°C |
| Electrical Resistivity | 1.29 | 1.33 (at 538°C) | µΩ·m |
| Magnetic Permeability (Hmax=200 Oe) | 1.0006 | — | µ (non-magnetic) |
| Curie Temperature | < −196°C (non-magnetic) | — | °C |
Inconel 625 is non-magnetic in all conditions — a critical requirement for instrumentation housings, MRI-adjacent equipment, and degaussed marine applications. Its combination of low thermal conductivity and high thermal expansion relative to carbon steel must be accounted for in thermal cycle design to prevent fatigue cracking at dissimilar-metal interfaces.
Inconel 625 Equivalent Grades International Standard Cross-Reference
The same alloy is referenced under different designations across national and international standards. The table below allows procurement engineers to cross-reference their specification against the UNS N06625 / ASTM B446 base material.
| Standard Body | Country / Region | Designation | Standard Reference |
|---|---|---|---|
| UNS | USA | N06625 | Unified Numbering System (SAE/ASTM) |
| ASTM | USA | Inconel 625 | ASTM B446 (Bar & Rod) |
| ASME | USA | SB446 | ASME Boiler & Pressure Vessel Code |
| AMS | USA (Aerospace) | AMS 5666 | SAE Aerospace Material Specification |
| Werkstoff | Germany / EU | 2.4856 | DIN 17752 / EN 10095 |
| DIN | Germany | NiCr22Mo9Nb | DIN 17752 (Rod/Bar) |
| EN | Europe | NiCr22Mo9Nb | EN 10095 |
| BS | United Kingdom | NA 21 | BS 3076 |
| JIS | Japan | NCF 625 | JIS H 4551 |
| AFNOR | France | NC22DNB4M | NF A 36-607 |
| GOST | Russia | ХН75МБТЮ | GOST 5632 |
| ISO | International | — | ISO 9723 (Rod/Bar), ISO 9724 (Plate) |
Inconel 625 Round Bar Dimensional Tolerances (ISO 286)
Jade Alloys supplies Inconel 625 cold drawn bars in ISO 286 tolerance classes H8 through H13 and K9 through K12. The table below lists the upper deviation (in mm) for the most common tolerance classes across diameter ranges. The lower deviation is always 0 for H-class tolerances.
| OD Range (mm) | h8 (+/0) | h9 (+/0) | h10 (+/0) | h11 (+/0) | h12 (+/0) | h13 (+/0) |
|---|---|---|---|---|---|---|
| 3 – 6 | 0.018 | 0.030 | 0.048 | 0.075 | 0.120 | 0.180 |
| 6 – 10 | 0.022 | 0.036 | 0.058 | 0.090 | 0.150 | 0.220 |
| 10 – 18 | 0.027 | 0.043 | 0.070 | 0.110 | 0.180 | 0.270 |
| 18 – 30 | 0.033 | 0.052 | 0.084 | 0.130 | 0.210 | 0.330 |
| 30 – 50 | 0.039 | 0.062 | 0.100 | 0.160 | 0.250 | 0.390 |
| 50 – 80 | 0.046 | 0.074 | 0.120 | 0.190 | 0.300 | 0.460 |
| 80 – 120 | 0.054 | 0.087 | 0.140 | 0.220 | 0.350 | 0.540 |
| 120 – 180 | 0.063 | 0.100 | 0.160 | 0.250 | 0.400 | 0.630 |
| 180 – 250 | 0.072 | 0.115 | 0.185 | 0.290 | 0.460 | 0.720 |
| 250 – 315 | 0.081 | 0.130 | 0.210 | 0.320 | 0.520 | 0.810 |
| 315 – 400 | 0.089 | 0.140 | 0.230 | 0.360 | 0.570 | 0.890 |
Standard tolerances supplied: H8, H9, H10, H11, H12, H13 (cold drawn bars); K9, K10, K11, K12 (precision ground). Hot-rolled and forged bars are supplied to rough-turned tolerances. Custom tolerances tighter than H8 are available for precision-machining applications — please submit drawings for quotation.
Inconel 625 Round Bar Weight Chart (kg per metre)
The weight per metre is calculated using the formula: W (kg/m) = (D² × π / 4) × ρ, where D is diameter in metres and ρ (density) = 8,440 kg/m³. Values below are rounded to 3 decimal places.
| Dia (mm) | Weight (kg/m) | Dia (mm) | Weight (kg/m) | Dia (mm) | Weight (kg/m) |
|---|---|---|---|---|---|
| 6 | 0.238 | 40 | 10.556 | 120 | 94.995 |
| 8 | 0.423 | 45 | 13.358 | 140 | 129.257 |
| 10 | 0.661 | 50 | 16.493 | 150 | 148.413 |
| 12 | 0.951 | 55 | 19.959 | 160 | 168.868 |
| 14 | 1.295 | 60 | 23.756 | 180 | 213.718 |
| 16 | 1.691 | 65 | 27.885 | 200 | 263.893 |
| 18 | 2.140 | 70 | 32.344 | 250 | 412.333 |
| 20 | 2.643 | 75 | 37.134 | 300 | 593.759 |
| 22 | 3.199 | 80 | 42.255 | 350 | 808.172 |
| 25 | 4.131 | 90 | 53.523 | 400 | 1,055.57 |
| 30 | 5.948 | 100 | 66.077 | 500 | 1,649.33 |
| 35 | 8.095 | 110 | 79.953 | 600 | 2,375.04 |
For lengths other than 1 metre, multiply the kg/m value by the length in metres. For custom weight calculations, use our online Metal Weights Calculator available in the Catalogue section.
Surface Finish Options for Inconel 625 Bars
| Finish | Process | Surface Ra (typical) |
|---|---|---|
| Black (As-Rolled) | Hot rolling without further treatment | Ra 3–10 µm |
| Pickled | Acid cleaning removes mill scale after hot rolling | Ra 2–6 µm |
| Rough Turned | Single-pass turning on lathe or centreless turning | Ra 1–4 µm |
| Bright Drawn | Cold drawn through precision dies | Ra 0.4–1.6 µm |
| Polished (240 Grit) | Belt/wheel polishing after cold drawing | Ra 0.2–0.8 µm |
| Mirror Finish | Electropolished or fine-polished | Ra < 0.1 µm |
| Centreless Ground | Abrasive grinding for precision OD | Ra 0.1–0.4 µm |
| Shot Blasted | Steel shot impingement | Ra 2–8 µm |
Heat Treatment & Material Conditions
| Condition | Process | Temperature Range | Effect on Properties |
|---|---|---|---|
| Solution Annealed | Heating to homogenise + rapid cooling (water/air quench) | 1,093 – 1,204°C | Maximum corrosion resistance; minimum hardness; optimal ductility |
| Hot Finished (As-Rolled) | Hot forming above recrystallisation temp; air cooled | Varies by product form | Acceptable properties; slightly higher hardness than full anneal |
| Cold Drawn | Cold reduction of cross-section; work-hardened | Not applicable (room temp) | Increased tensile & yield strength; tighter tolerances; bright finish |
| Stress Relieved | Low-temperature anneal post-forming | 870 – 980°C | Reduces residual stress without fully recrystallising; slight strength increase |
Important: Inconel 625 is NOT precipitation hardened for standard bar applications. Precipitation hardening (used in Inconel 718) requires aluminium and titanium additions not present in Inconel 625 at sufficient levels. For applications requiring tensile strengths above 1,100 MPa, consider Inconel 718 (UNS N07718) instead.
Inconel 625 Round Bar Industries & Applications
Inconel 625’s combination of high strength, outstanding corrosion resistance, excellent weldability, and wide service temperature range (−196°C to +982°C) makes it the material of choice for the most demanding applications across multiple industries. Below are the primary sectors supplied by Jade Alloys, with specific component applications for each.
- Oil & Gas / Subsea: Wellhead components, downhole tool mandrels, umbilical armouring, mooring line terminations, valve stems, riser clamps
- Chemical Processing: Reactor shells, heat exchanger shells, agitators, distillation column internals, pump shafts, valve bodies
- Marine & Seawater: Propeller shafts, fasteners, sea-water piping supports, sonar housings, submarine hull fittings
- Aerospace & Defense: Exhaust ducting, thrust reverser components, engine casing fasteners, jet engine bellows
- Nuclear / Power Generation: Reactor core support structures, steam generator baffles, instrumentation housings, feed-water heater tubes
- Pollution Control: Flue gas desulfurisation (FGD) scrubber components, stack liners, fan blades, absorber vessels
- Pulp & Paper: Bleach plant equipment, digester components, suction roll shells
- Pharmaceutical / Biotech: Autoclave internals, bioreactor shafts and agitators, CIP piping components
- Cryogenic Equipment: LNG plant components, liquid hydrogen storage fittings, cryogenic valve bodies
- Acid Production & Mining: Pickling tanks, acid storage liners, sulphuric acid plant heat exchangers
Inconel 625 vs. Other High-Performance Alloys — Which to Choose?
Selecting the right nickel alloy involves balancing corrosion resistance, strength requirements, temperature range, and cost. The table below compares Inconel 625 against the most commonly considered alternatives to help engineers make the correct grade selection.
| Property / Criterion | Inconel 625 (N06625) | Inconel 718 (N07718) | Hastelloy C276 (N10276) | Inconel 600 (N06600) | Monel 400 (N04400) |
|---|---|---|---|---|---|
| Tensile Str. (annealed) | 930 MPa | 1,380 MPa (aged) | 790 MPa | 655 MPa | 550 MPa |
| Yield Strength | 517 MPa | 1,170 MPa (aged) | 355 MPa | 310 MPa | 240 MPa |
| Max. Service Temp. | 982°C | 704°C (aged) | 1,040°C | 1,175°C | 482°C |
| Corrosion Resistance | Excellent (all) | Good | Excellent (reducing) | Good (oxidising) | Very good (seawater) |
| Cl⁻ Resistance | Excellent | Good | Excellent | Moderate | Good |
| H₂S / Sour Gas (NACE) | ✓ Qualified | ✓ (limited) | ✓ Qualified | Partial | ✓ Qualified |
| Weldability | Excellent (no PWHT) | Moderate (needs PWHT) | Excellent | Good | Good |
| Typical Use Case | Marine, chemical, subsea | Aerospace turbines, hi-strength | Reducing acids, FGD | High-temp oxidation | Seawater, HF acid |
| ASTM Bar Standard | B446 | B637 | B574 | B166 | B164 |
| Relative Cost (bar) | High | Very High | High | Moderate | Moderate |
Machining, Welding & Fabrication of Inconel 625 Round Bar
Machinability
Inconel 625 is classified as ‘difficult to machine’ due to its high strength, work-hardening tendency, and low thermal conductivity (which concentrates heat at the cutting edge). With correct tooling and parameters, however, consistent results are achievable:
- Use sharp, positive-rake carbide tools (Grade C-2 or better) or CBN inserts for high-volume production.
- Apply flood coolant — dry or semi-dry machining accelerates tool wear significantly.
- Use conservative cutting speeds: 15–30 m/min for turning; 5–10 m/min for drilling.
- Avoid rubbing or dwell — always maintain a chip-forming cut to prevent work hardening.
- Increase feed rates relative to stainless steel practice to maintain chip-forming conditions.
Weldability
Inconel 625 is one of the most weldable nickel superalloys. Key parameters for successful fabrication:
- Compatible welding processes: GTAW (TIG), GMAW (MIG), SMAW (Stick), PAW, SAW, LBW.
- Filler metal: ERNiCrMo-3 (AWS A5.14) for GTAW/GMAW; ENiCrMo-3 for SMAW. Self-fluxing for Alloy 625 to Alloy 625 joints.
- Post-weld heat treatment: NOT required for standard corrosion-service applications.
- Interpass temperature: ≤ 93°C (200°F) to prevent hot cracking in multi-pass welds.
- Pre-heat: not required for thicknesses below 25 mm in ambient conditions.
- Dissimilar metal welding: Alloy 625 filler is widely used as a ‘buttering layer’ between carbon steel and stainless components.
Cold Working & Forming
Inconel 625 is readily cold-formed by standard methods — bending, deep drawing, roll-forming, and spinning. Work hardening is significant (approximately 40% increase in yield strength after moderate cold reduction), which must be accounted for in forming force calculations. Annealing between heavy forming stages restores ductility.
Quality Assurance, Certifications & Testing
Every Inconel 625 Round Bar supplied by Jade Alloys undergoes a rigorous multi-stage quality control process. Our quality management system is certified to ISO 9001:2015, and all testing is carried out in approved laboratories under qualified inspector supervision.
Standard Documentation Supplied with Every Order
✔ EN 10204 3.1 Mill Test Certificate (MTC) — chemical composition, mechanical test results, heat/lot number
✔ Dimensional inspection report — OD, length, straightness checked against order specification
✔ Heat/lot traceability record — full chain of custody from original melt
✔ Packing list and commercial invoice for all export consignments
✔ Certificate of Origin (for import duty / preference purposes)
✔ Fumigation certificate (export shipments requiring phytosanitary compliance)
Mill / Source Approvals
Jade Alloys sources Inconel 625 bar from globally approved primary mills holding the relevant ASTM, ASME, AMS, and PED 2014/68/EU approvals. Material is never sourced from secondary traders without full mill-original documentation. Approved mill certificates are available for review before order placement on request.
All Inconel 625 Round Bars Supplied with Full EN 10204 3.1 MTC | Third-Party Inspection Available
Why Choose Jade Alloys for Inconel 625 Round Bars?
- Widest Stock Range in India: 3 mm to 800 mm diameter in a single source — no need to split orders across multiple suppliers for different sizes
- Certified ISO 9001:2015: Consistent, audited quality management at every stage — from incoming inspection to outbound documentation
- EN 10204 3.1 MTC as Standard: Full material traceability on every order — compliant with EPC, FEED, and lump-sum contract requirements
- EN 10204 3.2 Available: Third-party witnessed inspection available for critical projects — SGS, TUV, Bureau Veritas on request
- Cut-to-Length Service: We cut to your exact lengths — saving you material waste and machine time; minimum cutting charges
Packaging, Export & Delivery
Jade Alloys exports Inconel 625 round bars and other bar forms to customers in the Gulf, Southeast Asia, Europe, the Americas, and Africa. Our logistics team manages full end-to-end export operations from our Mumbai warehouse.
