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Nickel Alloy 725 (UNS N07725) – ASTM B805 High-Strength Nickel Alloy
ASTM B805 Alloy 725 Bar | API 6ACRA 120K | Age-Hardened Nickel Alloy for Sour Service
Xi'an Dongmeng Group Co., Ltd. is a China-based industrial metal manufacturer and exporter supplying Nickel Alloy 725 (UNS N07725) materials for international oil and gas, subsea engineering, marine equipment and industrial manufacturing projects.
Also known as Inconel 725, Alloy 725 is a precipitation-hardenable nickel-chromium-molybdenum-niobium alloy developed for applications requiring high mechanical strength and resistance to aggressive corrosive environments.
Its distinctive advantage is the combination of corrosion resistance broadly comparable to Alloy 625 and substantially higher strength after controlled precipitation hardening.
We support international B2B procurement with project-specific material sourcing, dimensional requirements, heat-treatment verification, inspection documentation and customized delivery arrangements.
Customers may request technical quotations for ASTM B805 bar and wire products, as well as engineered forging stock and machined components subject to applicable manufacturing specifications and availability.
What Is Nickel Alloy 725?
Nickel Alloy 725 (UNS N07725) is a high-performance corrosion-resistant nickel alloy strengthened through precipitation hardening.
Its chemical composition contains substantial nickel, chromium and molybdenum, together with niobium and titanium additions that enable significant strengthening during heat treatment.
Unlike alloys that rely primarily on cold deformation to increase strength, Alloy 725 develops its high-strength properties through controlled solution treatment and aging.
The resulting microstructure contains fine strengthening precipitates, predominantly gamma double-prime (γ″), which improve resistance to mechanical deformation while retaining useful ductility and toughness.
This combination makes Alloy 725 particularly suitable for large-section components, oilfield equipment, pressure-containing parts and heavily loaded components exposed to corrosive environments.
The alloy is commonly selected for demanding applications involving hydrogen sulfide, carbon dioxide and chloride-containing fluids, provided that the specified environmental and material qualification requirements are satisfied.
Key Material Advantages
| Property | Engineering Benefit |
| Precipitation Hardening | Develops high strength without relying on extensive cold working |
| High Nickel Content | Supports resistance to several forms of environmental cracking |
| Chromium Addition | Contributes to corrosion resistance in oxidizing environments |
| High Molybdenum Content | Enhances resistance to localized corrosion and certain reducing environments |
| Niobium and Titanium | Enable precipitation strengthening during aging |
| High Strength and Toughness | Suitable for heavily loaded engineered components |
| Sour-Service Capability | Can be qualified for specified HzS-containing environments |
| Good Machinability with Appropriate Procedures | Suitable for precision-engineered components and forging stock |
Engineering Note: Material suitability must be verified against actual service temperature, pressure, fluid chemistry, mechanical loading and the applicable construction and corrosion-control standards.
Nickel Alloy 725 Product Specifications
The following information provides a procurement reference for common Alloy 725 product configurations.
Actual available dimensions depend on manufacturing route, melt size, heat-treatment capability, minimum order quantity and inspection requirements.
| Product Form | Dimensional Reference | Manufacturing / Supply Condition |
| Round Bar | Approx. Ø12.5–254 mm (0.49–10 in), depending on mill route | Hot Rolled, Forged, Solution Annealed or Age Hardened |
| Rolled Round Bar | Approx. Ø12.5–101.6 mm (0.49–4 in) | Mill-dependent rolled product range |
| Forged Round Bar | Approx. Ø101.7–254 mm (4–10 in) | Mill-dependent forged product range |
| Hexagonal Bar | Dimensions according to inquiry | Subject to applicable ASTM B805 requirements |
| Square Bar | Dimensions according to inquiry | Subject to mill availability |
| Flat / Rectangular Bar | Custom section dimensions | Subject to suitable production route |
| Wire / Wire Rod | Diameter according to inquiry | ASTM B805 product specification, where applicable |
| Forging Stock | Diameter and weight according to approved requirements | Controlled forging and heat-treatment specification |
| Custom Components | Manufactured according to customer drawings | CNC Machining, Cutting and Finishing |
The dimensional ranges shown are representative industry references, not guaranteed Dongmeng inventory or production limits. Final availability and applicable specifications must be confirmed in the quotation.
Common Supply Requirements
| Parameter | Available Procurement Options |
| Material Grade | Alloy 725 / UNS N07725 |
| Primary Specification | ASTM B805 |
| Oilfield Material Specification | API 6ACRA, where applicable |
| Sour-Service Requirement | NACE MR0175 / ISO 15156-3, where specified |
| Heat Treatment | Solution Annealed or Solution Annealed + Age Hardened |
| Surface Condition | Hot Finished, Peeled, Turned, Ground or Machined, as available |
| Length | Mill Length or Customized Cut Length |
| Dimensional Tolerance | Applicable standard or customer-approved drawing |
| Material Identification | Grade, Heat Number and Traceability Marking |
| Inspection Certificate | EN 10204 3.1; additional documentation by agreement |
For critical engineering applications, customers should identify the final component type and service requirements before ordering.
Nickel Alloy 725 Chemical Composition
UNS N07725 is a nickel-chromium-molybdenum alloy containing niobium and titanium as principal strengthening additions.
The following composition represents commonly published Alloy 725 chemistry limits.
| Element | Symbol | Composition |
| Nickel | Ni | 55.0–59.0% |
| Chromium | Cr | 19.0–22.5% |
| Molybdenum | Mo | 7.0–9.5% |
| Niobium | Nb | 2.75–4.00% |
| Titanium | Ti | 1.00–1.70% |
| Aluminum | Al | 0.35% max. |
| Carbon | C | 0.030% max. |
| Manganese | Mn | 0.35% max. |
| Silicon | Si | 0.20% max. |
| Phosphorus | P | 0.015% max. |
| Sulfur | S | 0.010% max. |
| Iron | Fe | Balance |
How Chemical Composition Affects Performance
Nickel (Ni): Provides the foundation of the corrosion-resistant matrix and supports resistance to environmental cracking.
Chromium (Cr): Improves corrosion resistance through the formation of a protective chromium-rich passive film.
Molybdenum (Mo): Enhances resistance to pitting, crevice corrosion and selected reducing chemical environments.
Niobium (Nb): Participates in precipitation hardening and contributes significantly to high-strength properties.
Titanium (Ti): Supports precipitation strengthening and influences microstructural stability.
Iron (Fe): Constitutes the remaining major component of the alloy.
Chemical conformity should be verified against the specified edition of ASTM B805 or the applicable purchase specification using the actual heat analysis.
Nickel Alloy 725 Mechanical Properties
Alloy 725 mechanical properties depend strongly on product form, section size, manufacturing history and heat-treatment condition.
Age-hardened material has significantly greater strength than annealed material.
| Property | Annealed Round Bar | Age-Hardened Round Bar |
| Yield Strength, 0.2% Offset | 427 MPa (62 ksi) | 917 MPa (133 ksi) |
| Tensile Strength | 855 MPa (124 ksi) | 1,241 MPa (180 ksi) |
| Elongation | 57% | 30% |
| Hardness | Condition-dependent | Approx. 36 HRC |
These values are representative manufacturer test results for transverse specimens from hot-finished round sections of approximately 102–190 mm diameter. They are not universal guaranteed minimum values.
Alloy 725 – Typical API 6ACRA 120K Procurement Reference
For specified oil and gas applications, Alloy 725 may be supplied in the precipitation-hardened 120K strength classification.
| Mechanical Property | 120K Reference Requirement |
| Material Designation | UNS N07725 – 120K |
| Heat Treatment | Solution Annealed + Age Hardened |
| Yield Strength, 0.2% Offset | 827–1,034 MPa (120–150 ksi) |
| Tensile Strength | 1,034 MPa (150 ksi) minimum |
| Elongation | 20% minimum |
| Hardness | Up to 43 HRC, subject to sour-service requirements |
These values are published industry references for the 120K material designation. Contractual acceptance must follow the specified API 6ACRA edition, component size, qualification test coupon requirements and any additional purchaser specifications.
Important: A material designation of "Alloy 725" alone does not establish that the material meets API 6ACRA 120K or NACE MR0175 requirements.
Nickel Alloy 725 Physical Properties
Representative physical properties for Alloy 725 in the age-hardened condition are presented below.
| Physical Property | Typical Value |
| Density | 8.31 g/cm³ |
| Density | 8,310 kg/m³ |
| Melting Range | 1,271–1,343°C |
| Young's Modulus | 204 GPa |
| Shear Modulus | 78 GPa |
| Poisson's Ratio | 0.31 |
| Thermal Conductivity at 20°C | Approx. 10.6 W/m·K |
| Electrical Resistivity at 20°C | Approx. 1.144 μΩ·m |
| Mean Thermal Expansion, 20–100°C | Approx. 13.0 × 10⁻⁶/K |
| Magnetic Permeability | Typically below 1.001 |
These values are provided for preliminary engineering reference. Design calculations should use properties validated for the required temperature and product condition.
Alloy 725 Heat Treatment and Precipitation Hardening
Heat treatment is one of the most important factors determining the mechanical performance of Nickel Alloy 725.
The material achieves its high strength through controlled precipitation of strengthening phases during aging.
Solution Annealing
A representative solution annealing temperature is approximately:
1,040°C (1,900°F)
The material is subsequently cooled under a controlled procedure appropriate to the specified manufacturing route.
Solution treatment prepares the alloy for subsequent precipitation hardening.
Double Aging Treatment
A published manufacturer heat-treatment reference for sour gas applications is:
| Process Stage | Temperature | Holding Time |
| First Aging Stage | Approx. 730°C (1,350°F) | 8 hours |
| Controlled Furnace Cooling | Approx. 56°C/hour (100°F/hour) | Cool to 620°C |
| Second Aging Stage | Approx. 620°C (1,150°F) | 8 hours |
| Final Cooling | Air Cooling | To ambient temperature |
The controlled aging process develops the precipitation-strengthened microstructure responsible for the alloy's high yield and tensile strength.
This is an illustrative manufacturer-recommended procedure, not a substitute for the approved heat-treatment schedule required by the applicable product specification.
Why Heat Treatment Matters
Incorrect heat treatment may result in insufficient strength, excessive hardness, undesirable microstructural phases or reduced environmental cracking resistance.
For sour-service equipment, the purchaser should verify the applicable heat-treatment requirements, mechanical properties, hardness, metallurgical condition and relevant qualification documentation.
Nickel Alloy 725 Corrosion Resistance
Alloy 725 is designed for applications where conventional corrosion-resistant materials may not provide the required combination of mechanical strength and environmental durability.
Resistance to Hydrogen Sulfide (H₂S)
Nickel Alloy 725 is widely used in applications involving sour oil and gas production.
When supplied in an approved condition and within the relevant environmental limits, it can be suitable for H₂S-containing environments subject to NACE MR0175 / ISO 15156 requirements.
Material qualification must consider H₂S partial pressure, temperature, chloride content, in-situ pH, elemental sulfur where relevant, and other service conditions.
Chloride-Induced Pitting and Crevice Corrosion
The relatively high chromium and molybdenum content provides significant resistance to localized corrosion in chloride-containing environments.
This makes Alloy 725 useful for selected subsea components, marine fasteners and seawater-exposed equipment.
However, no nickel alloy should be assumed immune to localized corrosion under all chloride concentrations, temperatures and crevice conditions.
Stress Corrosion Cracking Resistance
Alloy 725 provides strong resistance to several forms of environmentally assisted cracking.
Its combination of corrosion resistance, strength and toughness is particularly useful for stressed components in demanding production and subsea environments.
Carbon Dioxide and Mixed Production Fluids
The alloy may be selected for equipment exposed to CO₂-containing fluids, chlorides and H₂S.
Final selection requires engineering assessment of the actual production-fluid composition, temperature and pressure.
Chemical Processing Environments
Alloy 725 also offers useful corrosion resistance in selected oxidizing and reducing chemical environments.
Resistance varies with acid concentration, temperature, contaminants and other operating conditions. Laboratory corrosion data should not be applied indiscriminately to different industrial processes.
Industrial Applications of Nickel Alloy 725
Nickel Alloy 725 is primarily specified for applications requiring high strength and corrosion resistance.
Oil & Gas Well Completion Equipment
Typical Components: Tubing hangers, landing nipples, side-pocket mandrels and polished bore receptacles.
Age-hardened Alloy 725 provides the combination of mechanical strength and corrosion resistance required for selected components operating in aggressive production environments.
Subsea Engineering
Typical Components: Subsea connectors, hydraulic couplings, mechanical fasteners and engineered equipment parts.
Its high strength and resistance to localized corrosion make Alloy 725 a candidate for critical subsea applications where material qualification supports its use.
Wellhead and Pressure-Control Equipment
Typical Components: Wellhead components, valve parts, connectors and pressure-control assemblies.
Material requirements may include API 6ACRA, purchaser-specific mechanical testing, traceability and verified heat-treatment conditions.
Marine Engineering
Typical Components: High-strength fasteners, pump shafts, propeller shafts and corrosion-resistant mechanical components.
Alloy 725 may be considered where high mechanical loads and seawater exposure occur together.
Chemical Processing Equipment
Typical Components: Valve stems, pump components, connectors and customized machined parts.
Material selection should be based on the actual chemicals, concentrations, operating temperatures and mechanical design requirements.
Precision Industrial Components
Typical Components: High-strength shafts, sleeves, machined fittings and engineered fastening systems.
Alloy 725 is suitable for consideration when both strength and corrosion resistance are critical design requirements.
Alloy 725 vs Alloy 625 vs Alloy 718 vs Alloy 925
Selecting the correct nickel alloy can reduce unnecessary material costs while improving component reliability.
The following comparison provides preliminary guidance.
| Property | Alloy 725 | Alloy 625 | Alloy 718 | Alloy 925 |
| UNS Designation | N07725 | N06625 | N07718 | N09925 |
| Alloy Family | Ni-Cr-Mo-Nb-Ti | Ni-Cr-Mo-Nb | Ni-Fe-Cr-Nb-Mo | Ni-Fe-Cr-Mo-Cu-Ti |
| Main Strengthening Method | Precipitation Hardening | Primarily Solid-Solution Strengthening | Precipitation Hardening | Precipitation Hardening |
| Relative Mechanical Strength | High | Lower in Annealed Condition | Very High | High |
| Localized Corrosion Resistance | Excellent | Excellent | Application-Dependent | Good to Very Good |
| Sour-Service Applications | Widely Used in Qualified Conditions | Used in Approved Conditions | Restricted by Condition and Service Limits | Used in Qualified Conditions |
| Typical Applications | Wellhead, Subsea, Downhole Components | Chemical, Marine and Oil & Gas Equipment | High-Strength Engineered Components | Oil & Gas Equipment and Fasteners |
When Should You Choose Alloy 725?
Choose Alloy 725 when high strength and corrosion resistance comparable to Alloy 625 are required together.
Choose Alloy 625 when excellent corrosion resistance is required but the higher strength of age-hardened Alloy 725 is unnecessary.
Consider Alloy 718 where very high mechanical strength is important and the specific corrosion environment permits its use.
Consider Alloy 925 for suitable oilfield and industrial applications where its strength and corrosion-performance envelope satisfies the design requirements.
Material Selection Note: These alloys are not interchangeable solely on the basis of tensile strength, chemical similarity or generalized corrosion rankings. Final material selection should follow the project specification and actual operating conditions.
Manufacturing, Machining and Welding
Hot Working and Forging
Alloy 725 products may be manufactured through controlled hot-working and forging processes.
Forging route, deformation ratio, final section size and heat-treatment procedures can influence the uniformity of mechanical properties.
For critical components, the purchaser should define applicable manufacturing requirements, testing locations and qualification criteria.
CNC Machining
Alloy 725 can be machined using appropriate tooling, cutting speeds, feed rates and cooling methods.
Machining in the solution-annealed condition may offer advantages for certain operations, while final dimensional machining may be performed after aging when required by the approved manufacturing plan.
Work hardening, tool wear, surface integrity and residual stresses should be considered during production planning.
Welding
Alloy 725 is weldable using qualified procedures.
Gas Tungsten Arc Welding (GTAW) and Gas Metal Arc Welding (GMAW) are commonly referenced processes.
Filler metal selection, post-weld heat treatment, strength requirements and corrosion resistance must be evaluated for the actual application.
For critical sour-service assemblies, welding procedure qualification should address weld-metal performance, heat-affected-zone properties, hardness and applicable corrosion-control requirements.
Standards and Material Compliance
International buyers should distinguish material specifications, oilfield qualification requirements and inspection-document standards.
| Standard / Designation | Application |
| UNS N07725 | Alloy Identification |
| ASTM B805 | Precipitation-Hardening Nickel Alloy Bar and Wire |
| API 6ACRA | Age-Hardened Nickel-Based Alloys for Oil & Gas Drilling and Production Equipment |
| NACE MR0175 / ISO 15156 | Materials for HzS-Containing Oil & Gas Production Environments |
| EN 10204 3.1 | Material Inspection Certificate Type |
| Customer Specifications | Additional Requirements for Geometry, Testing, Heat Treatment and Traceability |
Important Distinction: ASTM B805 is a bar-and-wire product specification. Forgings, pressure-containing parts and custom machined components may require separate manufacturing and qualification requirements.
For API 6ACRA projects, the purchase order should specify the applicable edition, material designation, test requirements and required documentation.
Inspection & Quality Assurance
Xi'an Dongmeng Group Co., Ltd. supports project-based inspection planning and material documentation for international industrial procurement.
The inspection program is defined according to the applicable standard, material condition and customer purchase order.
Chemical Composition Verification
Heat analysis and, where specified, Product Material Identification (PMI) may be used to verify alloy chemistry.
PMI methods should be selected with awareness of their detection limits, especially for low-level elements such as carbon, phosphorus and sulfur.
Mechanical Testing
Testing may include tensile strength, 0.2% offset yield strength, elongation and other requirements identified in the applicable specification.
Hardness Testing
Rockwell hardness testing may be specified to verify heat-treatment condition and relevant sour-service hardness limits.
Ultrasonic Testing
Ultrasonic inspection may be arranged for applicable bar and forging products according to agreed acceptance criteria.
Dimensional Inspection
Inspection may include diameter, length, straightness, surface condition and machining dimensions.
Heat-Treatment Verification
Heat-treatment records may be required for API 6ACRA and other critical applications.
Material Traceability
Material markings, heat numbers and certification records should provide traceability through the specified supply chain.
Third-Party Inspection
Independent inspection may be coordinated with an agreed inspection organization when required by the purchase order.
Material Test Certificates
EN 10204 3.1 documentation may be requested where available and contractually specified.
Additional testing or certification requirements must be agreed before order confirmation.
Packaging and International Shipping
Nickel Alloy 725 is a high-value engineering material that requires suitable identification, protection and handling.
Packaging is selected according to the material form, dimensions, quantity and transport method.
Export Packaging Options
| Product | Packaging Method |
| Round Bars | Protected Bundles or Suitable Export Wooden Cases |
| Cut-Length Bars | Protective Wrapping and Secured Packaging |
| Forging Stock | Custom Pallets or Wooden Cases |
| Machined Components | Individually Protected Export Packaging |
| Small Components | Labeled Protective Cartons within Export Cases |
Packaging should prevent mechanical damage, contamination, mixing of heats and loss of identification during transportation.
Heat numbers, material grades and shipment references should be maintained as required by the purchase order.
Shipping arrangements may include sea freight, air freight or other agreed logistics services.
Why Choose Xi'an Dongmeng Group Co., Ltd.?
Nickel Alloy Material Sourcing
We support international procurement of corrosion-resistant and high-performance nickel alloy products for demanding industrial applications.
Engineering-Oriented Quotations
Our quotation process considers material standards, grades, dimensions, heat-treatment requirements, inspection documentation and intended applications.
Customized Material Requirements
Customers can submit drawings, material specifications and technical requirements for manufacturing and sourcing feasibility review.
Quality Documentation Support
Material inspection reports, test certificates and agreed third-party verification can be incorporated into project procurement requirements.
International B2B Supply
We work with distributors, industrial fabricators, engineering contractors, equipment manufacturers and other professional material buyers.
Frequently Asked Questions About Nickel Alloy 725
Q1. What is Nickel Alloy 725?
Nickel Alloy 725 (UNS N07725) is a precipitation-hardenable nickel-chromium-molybdenum-niobium alloy designed to provide high mechanical strength and corrosion resistance. It is widely used for selected oil and gas, subsea and marine engineering components.
Q2. Is Alloy 725 the same as Inconel 725?
Yes. Alloy 725 and Inconel 725 refer to the same UNS N07725 alloy designation. INCONEL is a registered trademark of Special Metals Corporation and its subsidiaries.
Q3. What is the main ASTM standard for Alloy 725?
ASTM B805 is a principal product specification for precipitation-hardening nickel alloy bar and wire, including UNS N07725. Other component forms may require additional or alternative specifications.
Q4. Is Alloy 725 suitable for sour gas service?
Alloy 725 can be suitable for specified sour-service environments when the material condition and operating environment meet the applicable NACE MR0175 / ISO 15156 requirements. Suitability must be verified for each application.
Q5. What is the difference between Alloy 725 and Alloy 625?
Both alloys provide excellent corrosion resistance. Alloy 725 can develop substantially higher strength through precipitation hardening, making it attractive for highly loaded components operating in corrosive environments.
Q6. What is the yield strength of Alloy 725?
Yield strength depends on heat treatment and product condition. Representative age-hardened round-bar test data report approximately 917 MPa, while the common oilfield 120K material designation uses a minimum yield-strength reference of 827 MPa.
Q7. What is the maximum hardness of Alloy 725 for sour service?
A commonly specified maximum for qualified UNS N07725 sour-service material is 43 HRC. The applicable NACE MR0175 / ISO 15156 requirements, material condition and environmental restrictions must be checked.
Q8. Can Alloy 725 be welded?
Yes. Alloy 725 can be welded using qualified procedures such as GTAW and GMAW. Filler selection and any required post-weld heat treatment must account for strength, corrosion resistance and service conditions.
Q9. Can you supply customized Alloy 725 bar dimensions?
Customized dimensions and cut lengths can be reviewed according to available material, manufacturing capability, tolerance requirements and minimum order quantity. Buyers should provide their detailed dimensional requirements for confirmation.
Q10. What information is required for an Alloy 725 quotation?
Please provide the material grade, applicable standard, product form, dimensions, quantity, delivery condition, intended application, inspection requirements and delivery destination.
For sour-service applications, include the required API/NACE specifications and any relevant material qualification requirements.
Request a Nickel Alloy 725 Quotation
Looking for ASTM B805 Alloy 725 bar or UNS N07725 material for an industrial project?
Xi'an Dongmeng Group Co., Ltd. welcomes inquiries from international distributors, equipment manufacturers, industrial fabricators and engineering contractors.
Our team can review project-specific requirements and provide quotations according to material availability and approved specifications.
Request a Material Quotation: Submit your required alloy grade, dimensions, quantity and delivery destination.
Submit Technical Drawings: Send component drawings or technical specifications for sourcing and manufacturing review.
Request Inspection Documents: Specify the required MTC, inspection reports and material qualification records.
Discuss Custom Requirements: Contact our team regarding cut lengths, heat treatment, packaging and delivery arrangements.
Office Information
Company: Xi'an Dongmeng Group Co., Ltd.
Email: office@dongmjd.com
Phone: +86 157 6921 4734
WhatsApp: +86 157 6921 4734
Office Address: Room 4107, Runfeng Building, Sanqiao New Street, Weiyang District, Xi'an City, Shaanxi Province, China
Contact us to discuss your Nickel Alloy 725 material requirements and project specifications.
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