Inconel 625 Round Bars
Inconel 625 Round Bars Suppliers - ASTM B446 UNS N06625 Alloy 625 Rod
Stellar Alloy Steel Pipe and Tubes is a leading manufacturer and supplier of high-performance Inconel 625 Round Bars, engineered to deliver exceptional strength and corrosion resistance in the most demanding industrial environments. Our ASTM B446 UNS N06625 Round Bar meets stringent international quality standards, making it the preferred choice for critical applications in chemical processing, marine engineering, aerospace, and oil & gas industries.
Inconel 625, also known as Alloy 625 or UNS N06625, is a nickel chromium molybdenum alloy strengthened by niobium. This unique composition provides outstanding resistance to oxidation, pitting, crevice corrosion, and stress corrosion cracking. Unlike conventional materials, our Inconel 625 Rod maintains mechanical properties across a wide temperature range from cryogenic conditions to 980°C (1800°F).
We supply Inconel 625 Round Bars in various forms including bright bars, black bars, hex bars, square bars, and forged rods. Each bar undergoes rigorous quality testing and comes with complete material traceability documentation. Our manufacturing process ensures dimensional accuracy, superior surface finish, and consistent metallurgical properties throughout the material.
Whether you need standard sizes or custom dimensions, our technical team works closely with clients to deliver precision-engineered Alloy 625 Bar solutions that meet exact specifications. With extensive inventory, competitive pricing, and fast turnaround times, we serve industries worldwide with reliable supply chain solutions.
Table of Contents
- Types of Inconel 625 Bar Stock
- Inconel 625 Alloy Composition
- Specifications of Inconel 625 Round Bars
- Inconel 625 Chemical Composition (Weight %)
- Inconel 625 Mechanical Properties at Room Temperature
- Inconel 625 Physical Properties
- International Standards and Equivalent Grades
- Inconel 625 Round Bars Size Range
- Manufacturing Process of Inconel 625 Round Bars
- Applications of Inconel 625 Round Bars
- Features & Benefits of Inconel 625 Round Bars
- Testing & Quality Assurance
- Packaging & Delivery of Inconel 625 Round Bars
- Why Stellar Alloys Steel Pipes & Tubes
- FAQs About Inconel 625 Round Bars
- Call To Action
Types of Inconel 625 Bar Stock
We manufacture stainless steel round bars in multiple grades and finishes to meet diverse industrial requirements:
Alloy 625 Bright Bar
Alloy Inconel 625 Hex Bar
AMS 5837 Forged Bar
DIN 2.4856 Square Bar
Inconel 625 Rod
Inconel 625 Flat Bar
Inconel 625 Alloy Composition
Inconel 625 is a nickel-based superalloy containing approximately 58% nickel, 20-23% chromium, and 8-10% molybdenum. The addition of niobium (3.15-4.15%) provides solid solution strengthening without requiring precipitation hardening heat treatment. This metallurgical design ensures the material retains excellent fabricability while delivering superior mechanical properties.
The chromium content provides exceptional oxidation resistance and forms a protective passive layer that prevents corrosion in acidic and alkaline environments. Molybdenum enhances resistance to localized corrosion, particularly pitting and crevice corrosion in chloride-containing environments. The niobium acts as a stiffening agent, enabling high strength without complex heat treatment processes.
Key Material Characteristics
Our ASTM B446 UNS N06625 Round Bar exhibits remarkable versatility across operating conditions. The alloy demonstrates excellent weldability without post-weld heat treatment requirements, making it ideal for fabrication-intensive applications. Its low thermal expansion coefficient ensures dimensional stability in temperature-cycling applications.
The material shows outstanding resistance to seawater and brine solutions, making it indispensable for offshore platforms, desalination plants, and marine equipment. In chemical processing, Inconel 625 withstands aggressive acids including sulfuric, phosphoric, and nitric acids, as well as organic compounds and chlorides.
Specifications of Inconel 625 Round Bars
| Category | Specification |
| Available Forms – Round Bar | Diameter 3mm to 600mm |
| Available Forms – Hex Bar | Size 6mm to 180mm (Across Flats) |
| Available Forms – Square Bar | Size 4mm to 200mm |
| Available Forms – Flat Bar | Thickness 2mm to 100mm, Width 10mm to 500mm |
| Available Forms – Rectangular Bar | Custom dimensions available |
| Available Forms – Forged Bar | Up to 600mm diameter |
| Standard Lengths | 3 meters (10 feet), 6 meters (20 feet), Custom cut lengths available |
| Surface Finish Options | Black (Hot Rolled), Pickled & Oiled, Bright Finish (Cold Drawn), Centreless Ground & Polished, Peeled & Polished, Shot Blasted, Rough Turned |
| Tolerance Standards | H8, H9, H10, H11, H12, H13, K9, K10, K11, K12, Custom tolerances on request |
| Condition / Temper | Annealed (Solution Treated), Cold Worked, Hot Worked, As-Forged |
Inconel 625 Chemical Composition (Weight %)
Element | Minimum | Maximum | Typical |
Nickel (Ni) | 58.00 | – | 61.0 |
Chromium (Cr) | 20.00 | 23.00 | 21.5 |
Molybdenum (Mo) | 8.00 | 10.00 | 9.0 |
Niobium (Nb) | 3.15 | 4.15 | 3.65 |
Iron (Fe) | – | 5.00 | 2.5 |
Carbon (C) | – | 0.10 | 0.05 |
Manganese (Mn) | – | 0.50 | 0.25 |
Silicon (Si) | – | 0.50 | 0.25 |
Phosphorus (P) | – | 0.015 | 0.007 |
Sulfur (S) | – | 0.015 | 0.005 |
Aluminum (Al) | – | 0.40 | 0.20 |
Titanium (Ti) | – | 0.40 | 0.20 |
Cobalt (Co) | – | 1.00 | 0.50 |
Tantalum (Ta) | – | Included with Nb | – |
Note: Niobium + Tantalum combined: 3.15-4.15%
Inconel 625 Mechanical Properties at Room Temperature
Property | Value (SI Units) | Value (US Units) | Test Standard |
Tensile Strength | 827-1034 MPa | 120-150 ksi | ASTM E8 |
Yield Strength (0.2% Offset) | 414-655 MPa | 60-95 ksi | ASTM E8 |
Elongation | 30-60% | 30-60% | ASTM E8 |
Reduction of Area | 45-65% | 45-65% | ASTM E8 |
Hardness (Brinell) | 150-250 HB | 150-250 HB | ASTM E10 |
Hardness (Rockwell B) | 85-95 HRB | 85-95 HRB | ASTM E18 |
Elastic Modulus | 207 GPa | 30 x 10³ ksi | ASTM E111 |
Shear Modulus | 77 GPa | 11.2 x 10³ ksi | ASTM E143 |
Poisson’s Ratio | 0.31 | 0.31 | – |
Mechanical properties vary based on product form, size, and heat treatment condition
Inconel 625 Physical Properties
Property | Value (Metric) | Value (Imperial) |
Density | 8.44 g/cm³ | 0.305 lb/in³ |
Melting Point | 1290-1350°C | 2350-2460°F |
Curie Temperature | Below -196°C | Below -321°F |
Specific Heat | 410 J/kg·K @ 20°C | 0.098 Btu/lb·°F |
Thermal Conductivity @ 100°C | 10.0 W/m·K | 69.4 Btu·in/ft²·hr·°F |
Thermal Conductivity @ 500°C | 16.3 W/m·K | 113 Btu·in/ft²·hr·°F |
Electrical Resistivity @ 20°C | 129 μΩ·cm | 129 μΩ·cm |
Coefficient of Thermal Expansion | 12.8 μm/m·°C (20-100°C) | 7.1 x 10⁻⁶ in/in·°F |
Permeability | 1.001 at 200 Oe | Non-magnetic |
International Standards and Equivalent Grades
Standard | Grade Designation | Alternative Designation |
UNS | N06625 | Alloy 625 |
ASTM | B446, B564, B704, B705 | – |
ASME | SB-446, SB-564, SB-704, SB-705 | – |
AMS | 5599, 5666, 5837, 7248 | – |
DIN | 2.4856 | NiCr22Mo9Nb |
EN | NiCr22Mo9Nb | – |
VdTÜV | 472 | – |
WERKSTOFF NR. | 2.4856 | – |
BS | NA 21 | – |
AFNOR | NC 22 DNb | – |
JIS | NCF 625 | – |
Russia | ХН60МВТ | – |
Inconel 625 Round Bars Size Range
Diameter Range (mm and inches)
Diameter (mm) | Diameter (inches) | Tolerance | Typical Application |
3-10 | 1/8″ – 3/8″ | H9 | Small fittings, pins |
10-25 | 3/8″ – 1″ | H9/H10 | Bolts, fasteners |
25-50 | 1″ – 2″ | H10/H11 | Valve stems, shafts |
50-100 | 2″ – 4″ | H11/H12 | Pump shafts, large fittings |
100-200 | 4″ – 8″ | H12/H13 | Heavy machinery components |
200-400 | 8″ – 16″ | H13 | Large forgings, blocks |
400-600 | 16″ – 24″ | Custom | Special applications |
Hex Bar Dimensions (Across Flats)
- 6mm to 180mm (1/4″ to 7″)
- Standard lengths: 3m, 6m
- Tolerance: According to EN 10278
Square Bar Dimensions
- 4mm x 4mm to 200mm x 200mm
- Custom sizes available
- Standard lengths: 3m, 6m
Flat Bar Dimensions
- Thickness: 2mm to 100mm
- Width: 10mm to 500mm
- Length: Up to 6 meters
Our stainless steel round bars serve mission-critical applications across multiple industries due to their exceptional strength, corrosion resistance, and reliability in harsh environments:
Common applications include:
- Oil and Gas Industry – Downhole pump shafts, valve stems, instrumentation components, and wellhead equipment
- Chemical Processing Plants – Reactor vessel shafts, agitator components, pump impellers, and corrosion-resistant fasteners
- Marine and Offshore Structures – Propeller shafts, deck equipment, rigging hardware, and saltwater-resistant fittings
- Automotive and Mechanical Engineering – Engine components, transmission shafts, precision machined parts, and suspension elements
- Pump and Valve Manufacturing – Valve stems, pump shafts, piston rods, and high-pressure fittings
- Construction and Structural Frameworks – Architectural supports, railing systems, and load-bearing structural members
- Food Processing Equipment – Mixer shafts, conveyor components, sanitary fittings, and hygienic processing machinery
- Aerospace Components – Landing gear parts, high-strength fasteners, precision machined aircraft components
Manufacturing Process of Inconel 625 Round Bars
Hot Working Process
Our Inconel 625 Round Bars production begins with vacuum induction melting (VIM) or electric arc furnace (EAF) processes, ensuring clean, inclusion-free material. The ingots undergo hot working at temperatures between 1010-1180°C (1850-2150°F), where the material is forged or rolled into billets. This controlled hot working process establishes the desired grain structure and eliminates casting porosity.
Hot working provides several advantages: it improves ductility, refines grain structure, and eliminates internal stresses. The process also ensures homogeneous distribution of alloying elements throughout the material. Temperature and reduction ratios are carefully monitored to achieve optimal metallurgical properties.
Cold Drawing and Finishing
For precision applications requiring tight dimensional tolerances and superior surface finish, we employ cold drawing processes. The hot-worked bars are pickled to remove scale, then drawn through carbide dies at ambient temperature. Multiple drawing passes with intermediate stress-relief annealing ensure dimensional accuracy while maintaining material properties.
Cold drawn Inconel 625 Bright Bar exhibits excellent surface finish (typically Ra 0.8-1.6 μm), precise dimensional control (±0.025mm typical), and enhanced mechanical properties due to work hardening. This process is ideal for applications requiring minimal machining and high surface quality.
Solution Annealing and Heat Treatment
After forming operations, our Inconel 625 Round Bars undergoes solution annealing at 1095-1150°C (2000-2100°F), followed by rapid cooling. This heat treatment dissolves any carbide precipitates, homogenizes the microstructure, and optimizes corrosion resistance. The resulting material exhibits a single-phase austenitic structure with excellent ductility and toughness.
Quality Control Throughout Manufacturing
Each production stage includes rigorous inspection:
- Ultrasonic testing for internal soundness
- Dimensional verification using precision measuring equipment
- Surface inspection for defects
- Hardness testing to verify heat treatment effectiveness
- Chemical analysis to confirm composition
Applications of Inconel 625 Round Bars
Chemical Processing Industry
Inconel 625 Round Bars excels in chemical processing environments where materials face exposure to corrosive acids, bases, and organic compounds. The alloy resists attack from sulfuric acid, phosphoric acid, nitric acid, hydrochloric acid, and mixed acid environments. Our bars are used to manufacture:
- Reactor vessels and internals
- Heat exchanger tubes and tube sheets
- Mixing tanks and agitators
- Pump shafts and impellers
- Valve stems and trim
- Piping systems for corrosive fluids
- Distillation columns
- Scrubber systems
Marine and Offshore Engineering
The exceptional seawater corrosion resistance of Alloy 625 Bar makes it indispensable for marine applications. The material withstands chloride-induced pitting, crevice corrosion, and stress corrosion cracking in saltwater environments:
- Offshore platform components
- Subsea equipment and fasteners
- Marine propeller shafts
- Seawater handling equipment
- Desalination plant components
- Anchor chains and mooring hardware
- Ship fittings and fastenings
- Underwater vehicle components
Aerospace Industry
The high-temperature strength and oxidation resistance of UNS N06625 Round Bar make it suitable for aerospace applications operating at elevated temperatures:
- Aircraft exhaust systems
- Turbine seals and shrouds
- Combustion chamber components
- Afterburner parts
- Ducting for hot gas streams
- Thrust reverser components
- Engine mount hardware
Oil and Gas Industry
In oil and gas production, our Inconel 625 Hex Bar performs reliably in sour gas environments containing hydrogen sulfide, carbon dioxide, and chlorides:
- Downhole equipment
- Wellhead components
- Valves and valve seats
- Pump shafts for sour service
- Pipeline fittings
- Christmas trees and completion equipment
- Blowout preventer components
- Subsea manifolds
Power Generation
Power plants utilize Inconel 625 Rod for components exposed to high temperatures and corrosive combustion products:
- Steam generator tubing
- Superheater tubes
- Heat exchanger components
- Turbine parts
- Stack gas scrubber systems
- Flue gas desulfurization equipment
Pollution Control Equipment
The alloy’s resistance to acidic and alkaline environments makes it ideal for pollution control systems:
- Scrubber internals
- Ductwork for corrosive gases
- Stack liners
- Waste incinerator components
- Acid mist eliminators
Nuclear Industry
Inconel 625 meets the stringent requirements of nuclear applications:
- Reactor core components
- Fuel rod assemblies
- Control rod components
- Pressure vessel internals
- Steam generator parts
Features & Benefits of Inconel 625 Round Bars
Superior Corrosion Resistance
Pitting and Crevice Corrosion Resistance
Our Inconel 625 Round Bars demonstrates exceptional resistance to localized corrosion in chloride environments. The high chromium and molybdenum content creates a stable passive film that prevents pitting even in aggressive seawater and brine solutions.
Oxidation Resistance
The alloy maintains a protective oxide scale at temperatures up to 1000°C (1832°F), preventing oxidation in air, combustion gases, and other oxidizing environments. This characteristic enables long service life in high-temperature applications.
Stress Corrosion Cracking Resistance
Unlike many stainless steels, Alloy 625 Bar resists chloride-induced stress corrosion cracking, making it suitable for highly stressed components in marine and chemical processing environments.
Outstanding Mechanical Properties
High Strength Across Temperature Range
The solid solution strengthening provided by niobium ensures excellent strength without heat treatment. The material maintains tensile strength above 620 MPa even at 650°C (1200°F).
Excellent Fatigue Resistance
Our UNS N06625 Round Bar exhibits superior fatigue strength, making it ideal for dynamic loading applications such as pump shafts, springs, and reciprocating equipment.
Toughness at Cryogenic Temperatures
The face-centered cubic (FCC) crystal structure maintains ductility and toughness at temperatures as low as -196°C (-321°F), suitable for LNG handling and cryogenic service.
Manufacturing and Fabrication Advantages
Excellent Weldability
Inconel 625 welds without cracking and typically requires no post-weld heat treatment. The weld metal exhibits properties similar to the base metal, simplifying fabrication.
Good Formability
Despite its high strength, the alloy can be formed using standard equipment. Work hardening occurs during cold forming but can be relieved through annealing.
Machinability
While tougher to machine than austenitic stainless steels, our Inconel 625 Bright Bar with controlled hardness and superior surface finish reduces tool wear and improves machining efficiency.
Long-Term Reliability
Dimensional Stability
The low coefficient of thermal expansion and high creep resistance ensure minimal dimensional changes during thermal cycling and long-term elevated temperature service.
Long Service Life
The exceptional corrosion resistance and high-temperature strength translate to extended component life, reducing maintenance costs and downtime.
Wide Operating Temperature Range
Inconel 625 performs reliably from cryogenic temperatures (-196°C) to elevated temperatures (980°C), providing design flexibility.
Testing & Quality Assurance
Material Testing and Certification
Every batch of Inconel 625 Round Bars undergoes comprehensive testing to ensure compliance with international standards:
Chemical Analysis
- Optical Emission Spectroscopy (OES)
- X-Ray Fluorescence (XRF)
- Wet chemical analysis for verification
- Heat-by-heat traceability
Mechanical Testing
- Tensile testing per ASTM E8
- Hardness testing (Brinell, Rockwell, Vickers)
- Impact testing when specified
- Bend testing for ductility verification
Non-Destructive Testing (NDT)
- Ultrasonic testing (UT) for internal soundness
- Eddy current testing for surface defects
- Magnetic particle inspection (when applicable)
- Liquid penetrant inspection for surface crack detection
- Visual and dimensional inspection
Metallurgical Examination
- Microstructure analysis
- Grain size determination per ASTM E112
- Inclusion rating per ASTM E45
- Intergranular corrosion testing when required
Compliance and Certifications
Our manufacturing facility maintains the following certifications:
- ISO 9001:2015 – Quality Management System
- ISO 14001:2015 – Environmental Management
- OHSAS 18001 – Occupational Health and Safety
- PED 2014/68/EU – Pressure Equipment Directive
- NACE MR0175/ISO 15156 – Sour service compliance
- AD 2000 Merkblatt – German pressure vessel code
Documentation Provided
With every shipment, we provide:
Material Test Certificate (MTC)
EN 10204 3.1 or 3.2 certification including:
- Heat number and traceability
- Chemical composition analysis
- Mechanical properties test results
- Heat treatment details
- Manufacturing process information
Additional Documentation (when specified)
- Third-party inspection reports
- Non-destructive testing reports
- Positive Material Identification (PMI) certificates
- NABL/UKAS accredited test reports
- Mill test certificates from primary producers
- Manufacturer’s declarations of conformity
Third-Party Inspection
We welcome third-party inspection by recognized agencies:
- Lloyd’s Register
- Bureau Veritas
- TÜV
- DNV GL
- SGS
- Intertek
- ABS
Packaging & Delivery of Inconel 625 Round Bars
Protective Packaging
Our Inconel 625 Round Bars packaging ensures material arrives in pristine condition:
Primary Protection
- Individual bars wrapped in VCI (Volatile Corrosion Inhibitor) paper
- Plastic sleeves for bright finish bars
- End protectors to prevent damage
Secondary Packaging
- Bundled and strapped with steel bands
- Wooden crates for export shipments
- Cardboard/plywood partitions between bars
- Moisture-resistant wrapping
- Desiccant packets for humidity control
Export Packaging
- Fumigated wooden crates per ISPM-15
- Waterproof packaging for sea freight
- Shock-resistant packaging for air cargo
- Clear labeling with material grade, heat number, and dimensions
Logistics and Delivery
Inventory and Lead Times
- Standard sizes: Available from stock
- Custom sizes: 4-6 weeks from order confirmation
- Rush orders: Expedited processing available
Shipping Options
- Courier services for small quantities
- LCL (Less than Container Load) for partial shipments
- FCL (Full Container Load) for bulk orders
- Air freight for urgent requirements
- Multi-modal transport solutions
Global Delivery Network We supply to clients in over 60 countries including:
- USA, Canada, Mexico
- UK, Germany, France, Italy, Netherlands, Spain
- UAE, Saudi Arabia, Qatar, Kuwait, Oman
- Singapore, Malaysia, Indonesia, Thailand
- Australia, New Zealand
- South Africa, Nigeria, Kenya
- Brazil, Argentina, Chile
Why Stellar Alloys Steel Pipes & Tubes
Quality You Can Trust
Our commitment to quality begins with sourcing premium raw materials from certified mills. Every Inconel 625 Rod undergoes multi-stage inspection, ensuring only materials meeting the highest standards reach our customers. We maintain complete traceability from melt to delivery, providing peace of mind for critical applications.
Technical Expertise
Our metallurgical engineers and technical team bring decades of experience in nickel alloys. We provide:
- Material selection guidance
- Application-specific recommendations
- Corrosion resistance analysis
- Welding procedure advice
- Heat treatment specifications
- Machining recommendations
Competitive Pricing
Through strategic partnerships with global mills and efficient operations, we offer competitive pricing without compromising quality. Our bulk purchasing power and optimized supply chain enable cost savings we pass to customers.
Extensive Inventory
Maintaining substantial stock of standard sizes ensures quick turnaround times. Our warehouse stocks:
- Multiple diameter ranges
- Various surface finishes
- Different tolerance grades
- Alternate product forms (hex, square, flat)
Custom Solutions
We understand that standard sizes don’t fit every application. Our capabilities include:
- Custom diameter and length cutting
- Precision grinding to tight tolerances
- Special surface finishes
- Heat treatment to specific requirements
- Machining and fabrication services
On-Time Delivery
We recognize that project timelines are critical. Our logistics team coordinates shipments to meet your schedule:
- Expedited processing for urgent orders
- Flexible delivery options
- Real-time shipment tracking
- Direct delivery to project sites
After-Sales Support
Our relationship doesn’t end at delivery. We provide:
- Technical support throughout the product lifecycle
- Assistance with installation and commissioning
- Help troubleshooting material-related issues
- Recommendations for maintenance and care
Industry Recognition
- Approved supplier to major EPC contractors
- Qualified vendor for leading oil & gas companies
- Certified supplier to aerospace manufacturers
- Trusted partner of chemical processing firms
FAQs About Inconel 625 Round Bars
Inconel 625 contains molybdenum and niobium, providing superior corrosion resistance and higher strength compared to Inconel 600. While Inconel 600 excels in oxidizing environments, Inconel 625 performs better in reducing environments and offers enhanced resistance to pitting and stress corrosion cracking in chloride solutions.
Yes, Inconel 625 exhibits excellent weldability using common techniques including GTAW (TIG), GMAW (MIG), and SMAW (stick welding). The alloy typically does not require pre-heat or post-weld heat treatment. Use Inconel 625 filler metal (ERNiCrMo-3) for welding to maintain corrosion resistance.
Inconel 625 offers superior corrosion resistance, especially in chloride environments where 316 stainless steel is prone to pitting and stress corrosion cracking. Inconel 625 also maintains strength at elevated temperatures where 316 stainless steel loses mechanical properties. However, Inconel 625 costs significantly more than 316 stainless steel.
Standard sizes are typically available from stock for immediate shipment. Custom diameters and special tolerance requirements generally require 4-6 weeks from order confirmation. Rush orders can often be accommodated with expedited processing.
We provide EN 10204 3.1 Material Test Certificates as standard, including chemical composition, mechanical properties, heat treatment details, and traceability. EN 10204 3.2 certificates with third-party verification are available upon request, along with NDT reports, PMI certificates, and supplementary test results.
Store in a dry, covered area away from dissimilar metals to prevent galvanic corrosion. Keep bars separated to avoid surface damage. For bright finish bars, maintain the protective wrapping until use. Avoid contact with carbon steel equipment during handling to prevent contamination.
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