Inconel 725 Round Bar
➡️ Alloy 725 | UNS N07725 | EN 2.4668 | ASTM B805
➡️ ASTM, EN, JIS & International Standards
➡️ Supply Conditions
➡️ Multiple Diameters & Supply Lengths
➡️ Global Export & International Delivery
Country of Origin:
Europe, Japan, USA
Material Type:
Nickel Alloy
UNS Number:
N07725
Wr. No.:
2.4668
MTC Available:
EN 10204 3.1
Product Description for Inconel 725 Round Bar
Inconel 725 Round Bar is made from an age-hardenable nickel-chromium-molybdenum-niobium alloy, UNS N07725. Bars are supplied to ASTM B805, which covers precipitation-hardening nickel alloy bar and wire.
The alloy combines the corrosion resistance of Alloy 625 with high strength from age hardening. It resists hydrogen embrittlement, stress corrosion cracking in sour gas, and pitting and crevice corrosion in chloride environments.
A yield strength above 827 MPa can be reached by ageing alone, without cold work. This is important for large sections and complex shapes.
Bars are supplied solution treated for machining, or solution treated and aged for direct use. The alloy is non-magnetic.
Common applications include oil and gas hangers, landing nipples, side pocket mandrels, packer bodies, high-strength fasteners, subsea parts and marine components. It is widely used in sour service under NACE MR0175 / ISO 15156 with the relevant hardness limits. Alloy 725 was developed for oil and gas completion equipment, where parts must be very strong and also survive hydrogen sulfide, chlorides and high temperature at the same time. Unlike Alloy 718, which relies on a higher iron content, Alloy 725 keeps most of the chemistry of Alloy 625 and adds niobium and titanium for age hardening. Many operators now order it to API Standard 6ACRA, which adds extra requirements for age-hardened nickel alloys used in oilfield equipment, such as impact tests, microstructure checks and tight control of heat treatment. Bars are commonly stocked in diameters used for hangers and nipples, and cut pieces can be supplied aged or solution treated to suit the machining plan.
Common Applications of Inconel 725 Round Bar
➡️ Machined shafts, spindles, valve stems, pump sleeves and pins for food, beverage, dairy and pharmaceutical equipment, where the passive chromium oxide film resists both product acids and caustic clean-in-place chemicals.
➡️ Fasteners, studs, bolts, threaded rod and anchor components produced from bar stock, chosen for corrosion resistance combined with the ductility needed for cold heading and thread rolling.
➡️ Chemical, water treatment and general process plant parts such as agitator shafts, flange blanks, nozzles and support components handling water, steam and mildly corrosive media free of significant chlorides.
➡️ Architectural and structural hardware including handrail stanchions, balustrade fittings, tension rods and bollards, where a bright ground or polished bar finish provides both appearance and low maintenance.
International Equivalent Grade for Alloy 725 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N07725
ASTM B637
USA
UNS N07725
EN / DIN
Europe
EN 2.4668
JIS
Japan
JIS NCF 725
GB
China
GH4169
AFNOR
France
NC22DNB
Technical Specification for Inconel 725 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
725 / UNS N07725
-
Standard
ASTM B805
-
Product Form
Round bar / rod
-
Diameter (supply range)
6–250
mm
Length (random)
1–6
m
Manufacturing Process
Hot rolled, forged, extruded or cold drawn
-
Surface Finish
Descaled, pickled, peeled, turned, ground or bright
-
Heat Treatment / Delivery Condition
Solution treated, or solution treated and aged
-
Tolerance Standard
ASTM B805 tolerance tables
-
Density
8.31
g/cm³
Melting Range
1271–1343
°C
Thermal Conductivity at 20°C
10.5
W/m·K
Coefficient of Thermal Expansion 20–100°C
13.0
µm/m·K
Specific Heat at 20°C
-
J/kg·K
Electrical Resistivity at 20°C
1.14
µΩ·m
Modulus of Elasticity at 20°C
204
GPa
Magnetic Properties
Non-magnetic
-
Testing / Inspection
Chemical analysis, tensile, hardness, dimensional, UT and PMI on request
-
Certification
EN 10204 3.1 mill test certificate (3.2 on request)
-
Technical Specifications
Get the key technical specifications for Inconel 725 Round Bar
Inconel 725 Round Bar is supplied to ASTM B805. The standard gives requirements for the solution treated condition and the capability after ageing.
Solution treatment is at about 1038°C followed by air cooling. Ageing is at about 732°C for 8 hours, furnace cooled to about 621°C, held 8 hours and air cooled.
For sour service, bars are often tested to NACE MR0175 / ISO 15156 with hardness limits.
Standard testing includes chemical analysis, tensile, hardness and dimensional checks, with impact testing, UT and PMI on request.
For oilfield orders, API Standard 6ACRA is often added to ASTM B805. It covers age-hardened nickel alloys such as 718, 725, 925 and 945X, and sets requirements for melting practice, heat treatment, grain size, microstructure, Charpy impact tests and hardness. Some operators also have their own specifications with narrower strength bands. When ordering, state the full list of documents, the required strength level and whether bars are to be supplied solution treated or aged. For large bars, test positions for tensile, impact and hardness should be agreed, because properties at mid-radius are what matter for thick parts such as hangers and packer bodies.
Chemical Composition for Inconel 725 Round Bar
Element
Symbol
Min
Max
Unit
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
%
Aluminium
Al
-
0.35
%
Carbon
C
-
0.03
%
Manganese
Mn
-
0.35
%
Silicon
Si
-
0.20
%
Phosphorus
P
-
0.015
%
Sulfur
S
-
0.010
%
Iron
Fe
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 725 Round Bar
The table shows the ASTM B805 limits for UNS N07725.
Chromium at 19–22.5% and molybdenum at 7–9.5% give resistance to pitting, crevice corrosion and sour environments, similar to Alloy 625.
Niobium at 2.75–4.00% and titanium at 1.00–1.70% form the strengthening precipitates during ageing.
Carbon is kept very low to avoid carbides that could reduce corrosion resistance. Iron forms the balance. Molybdenum at 7–9.5% and chromium at 19–22.5% are close to the Alloy 625 range. This gives Alloy 725 a pitting resistance equivalent well above 40, much higher than Alloy 718, and good resistance to chloride pitting, crevice corrosion and sour gas cracking. Niobium at 2.75–4.00% and titanium at 1.00–1.70% form the gamma double prime and gamma prime phases during ageing, which give the high strength. Aluminium is limited to 0.35% and carbon to 0.03%, which keeps grain boundaries clean. Nickel at 55–59% gives a stable matrix. Phosphorus and sulfur are held very low to protect hot workability and toughness.
Nickel is held at 55–59%, with iron as the balance, usually about 5–15%. The low iron is part of why Alloy 725 resists hydrogen embrittlement better than 718.
Mechanical Properties for Inconel 725 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (ASTM B805, solution treated)
≥ 758
MPa
Yield Strength 0.2% (solution treated)
≥ 310
MPa
Elongation (solution treated)
≥ 30
%
Tensile Strength (aged, capability)
≥ 1034
MPa
Yield Strength 0.2% (aged, capability)
≥ 827
MPa
Elongation (aged, capability)
≥ 20
%
Hardness (sour service limit, NACE MR0175)
≤ 43
HRC
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 725 Round Bar
The solution treated values are ASTM B805 minimum requirements. The aged values show the capability after the standard ageing treatment.
After ageing, the alloy reaches high strength while keeping good ductility and corrosion resistance.
For sour service, hardness must stay within the NACE MR0175 / ISO 15156 limit. The Alloy 725 certificate should show the ageing cycle, hardness and tensile results for each lot. ASTM B805 gives Alloy 725 solution treated minimums of 758 MPa tensile strength, 310 MPa yield strength and 30% elongation. After the standard ageing cycle, the alloy reaches at least 827 MPa yield strength and 1034 MPa tensile strength with elongation of at least 20%. The key point for oilfield design is that this strength is reached by ageing alone, so large bars and complex forgings have uniform properties through the section. For sour service, hardness must stay at or below 43 HRC under NACE MR0175 / ISO 15156, and heat treatment records should show that the ageing cycle was correctly applied.
Charpy impact tests at low temperature are often added for subsea parts, and API 6ACRA sets minimum impact values for large sections.
Dimension / Sizes for Inconel 725 Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
10–300
mm
Standard Length (random)
1–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Per ASTM B805 tolerance tables
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per ASTM B805 or as agreed
-
End Condition
Saw cut square, chamfered or as ordered
-
Surface Finish
Hot finished, descaled, pickled, peeled, turned, centreless ground or cold drawn bright
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 725 Round Bar
Pricing for Inconel 725 Round Bar
Round Bar Prices are generally quoted per kilograms or meters tonnes and can fluctuate with the global raw material and market prices. The final price will depend on a variety of factors, including the grade size, diameter, length, surface finish, the quantity and whether the bars are cut to length or in standard lengths.
For smaller quantities, we can also quote per metre or per piece basis once the required dimensions have been confirmed. Container-loads or orders that are larger in size are typically priced per tonne, based upon the specifications required and the supply conditions.
Please provide your desired dimensions, grades, length number, and end for a current quote including the lead time applicable and details for certification.
Pricing
Get current Inconel 725 Round Bar pricing based on size, quantity, grade, finish, and delivery requirements.
Why Choose Us
Euro Steel Bars is an international distributor, stockist and exporter of stainless round steel bars that cover carbon, stainless alloy, special grades. We stock a variety of sizes and grades. We guarantee every order with mill test certificates as well as full quality-assurance documentation. Our name speaks to our roots: European-sourced materials that is backed by the certificates and rigor that buyers from Asia as well as the Gulf and Africa are looking for.
Each bar we deliver is accompanied by EN 10204 3.1 mill test certificates as well as complete documentation of quality, so what you receive corresponds to what’s written in the documents. We carry a selection of sizes and grades ready for transport, and cut length upon the request of customers, which results in quicker lead times, whether you’re ordering just a one-off spec or a complete project tonnage.
We operate an actual wholesale business that is that is supported with an internationally-operated supply chain therefore we are able to serve fabricators sourcing one grade the same way in the same way as an EPC contractor who is placing a large order. Our clients include manufacturers, fabricators EPC construction companies, engineers oil and gas projects as well as construction companies. we design our inventory as well as documentation to show what buyers need to bring projects forward.
Our customers trust us across Qatar, Oman, Bahrain, Kuwait, Jordan, Malaysia, Singapore, Thailand, Taiwan, Turkey, Italy and South Africa. If you’re looking to source an Gulf energy project, or a construction project within Southeast Asia, you get the same quality of certified material, the exact documentation, and the exact delivery procedure.
Frequently Asked Questions
Should I choose Alloy 725 or Alloy 718?
What is API 6ACRA and does it apply to Alloy 725?
What hardness limit applies to Alloy 725 in sour service?
Can Alloy 725 be supplied pre-aged?
How is Alloy 725 heat treated, welded and machined?
What are the limits of Alloy 725?
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