Incoloy 925 Round Bar
➡️ Alloy 925 | UNS N09925 | 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:
N09925
Wr. No.:
-
MTC Available:
EN 10204 3.1
Product Description for Incoloy 925 Round Bar
Incoloy 925 Round Bar is a solid cylindrical bar produced from age-hardenable nickel-iron-chromium alloy UNS N09925. Bar and wrought products are supplied to ASTM B805, and the alloy is widely qualified against NACE MR0175 / ISO 15156 and API 6ACRA for sour service. Incoloy is a registered trademark of Special Metals Corporation.
The alloy combines 42.0-46.0% nickel and 19.5-22.5% chromium with molybdenum, copper, titanium and aluminium additions on an iron balance. Chromium and molybdenum provide resistance to pitting, crevice corrosion and general attack, copper improves performance in reducing acids such as sulphuric and phosphoric, and the high nickel content protects against chloride-induced stress-corrosion cracking. Titanium and aluminium enable precipitation hardening, forming gamma prime Ni3(Al,Ti) during ageing.
Material is supplied either solution annealed or solution annealed and aged. In the aged condition the alloy develops 0.2% proof stress commonly in the range 758-965 MPa, with hardness typically 32-38 HRC, while retaining the corrosion resistance of the annealed material. This combination of high strength with resistance to sulphide stress cracking is why the alloy is a standard selection for deep and sour gas well hardware.
Bar is available in diameters from about 6 mm to 400 mm in 3 to 6 m lengths, in hot-finished, peeled, turned or ground condition.
Typical applications include downhole tubing hangers, packers, landing nipples, mandrels and safety valve components, wellhead and Christmas tree parts, valve stems, fasteners, shafts, and pump and compressor components. Industries served include oil and gas production, subsea equipment, chemical processing and marine engineering.
Common Applications of Incoloy 925 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 925 Round Bar
Standard
Country / Region
Grade
ASTM B805
USA
UNS N09925 - wrought products
ASTM B637
USA
UNS N09925 - precipitation-hardening bar and forgings
NACE MR0175 / ISO 15156-3
International
UNS N09925 for sour service
API 6ACRA
International
Alloy 925 corrosion-resistant alloy for wellhead equipment
Technical Specification for Incoloy 925 Round Bar
Specification
Value
Unit
Material
Nickel-iron-chromium alloy
-
Grade
Alloy 925 / UNS N09925
-
Product Form
Round bar / rod / forged round
-
Standard
ASTM B805
-
Diameter
6 - 400 (available range)
mm
Length
3 - 6 (standard random or fixed)
m
Manufacturing Process
Hot rolled, forged or cold drawn
-
Production Route
Vacuum induction melting with ESR or VAR remelting, hot working, solution annealing, optional ageing
-
Surface Finish
Hot-finished and pickled, peeled, rough turned, cold-drawn, ground, polished
-
Heat Treatment / Delivery Condition
Solution annealed, or solution annealed and aged as ordered
-
Solution Annealing Temperature
980 - 1010 followed by rapid cooling (typical)
deg C
Ageing Treatment
740 for 6 to 9 hours, furnace cool to 620, hold until total precipitation treatment time reaches 18 hours, then air cool or faster (per ASTM B805)
deg C
Sour Service Qualification
NACE MR0175 / ISO 15156-3 subject to hardness and environmental limits
-
Tolerance Standard
ASTM B805 and as agreed
-
Carbon Equivalent (CEV)
Not applicable to nickel alloys
-
Density
8.14 (typical)
g/cm3
Melting Range
1315 - 1370 (typical)
deg C
Thermal Conductivity
11.3 at 20 deg C (typical)
W/m.K
Coefficient of Thermal Expansion
13.0 at 20 - 100 deg C (typical)
micro-m/m.K
Specific Heat
435 at 20 deg C (typical)
J/kg.K
Electrical Resistivity
1.16 (typical)
micro-ohm.m
Modulus of Elasticity
200 at room temperature (typical)
GPa
Magnetic Properties
Non-magnetic, relative permeability approximately 1.0
-
Applicable Testing Standard
ASTM E8 / E8M, ASTM E18, ASTM E1473, ASTM G48, NACE TM0177
-
Certification / Inspection Documents
EN 10204 Type 3.1 or 3.2 mill test certificate
-
Technical Specifications
Get the key technical specifications for Incoloy 925 Round Bar
Incoloy 925 Round Bar is supplied to ASTM B805 for wrought products in this alloy. For oilfield use the material is normally additionally qualified against NACE MR0175 / ISO 15156-3 and, for wellhead and Christmas tree equipment, against API 6ACRA. These documents impose hardness ceilings and environmental limits on partial pressure of hydrogen sulphide, chloride concentration and temperature, and those limits must be checked against the actual well conditions.
Two supply conditions are used. Solution annealing at approximately 980-1010 deg C followed by rapid cooling gives a soft, ductile, fully corrosion-resistant condition suitable for forming and machining. The age-hardening treatment specified in ASTM B805 is a two-stage cycle: hold at 740 deg C for 6 to 9 hours, furnace cool to 620 deg C, hold until the total precipitation treatment time reaches 18 hours, then air cool or faster. This precipitates gamma prime Ni3(Al,Ti) and roughly doubles the yield strength.
Machining requires nickel alloy practice: rigid setups, sharp positive rake tooling, low speeds, heavy positive feeds and generous coolant, since the alloy work hardens rapidly.
Testing normally includes chemical analysis to ASTM E1473, tensile testing to ASTM E8 / E8M, hardness to ASTM E18, and for sour service applications sulphide stress cracking testing to NACE TM0177. Pitting resistance testing to ASTM G48 and ultrasonic examination may be specified. Hardness is reported on every heat because it is the primary NACE acceptance criterion.
Chemical Composition for Incoloy 925 Round Bar
Element
Symbol
Min
Max
Unit
Nickel
Ni
42.0
46.0
%
Chromium
Cr
19.5
22.5
%
Molybdenum
Mo
2.5
3.5
%
Copper
Cu
1.5
3.0
%
Titanium
Ti
1.9
2.4
%
Aluminium
Al
0.10
0.50
%
Carbon
C
-
0.03
%
Manganese
Mn
-
1.0
%
Silicon
Si
-
0.5
%
Sulfur
S
-
0.03
%
Iron
Fe
22.0
Balance
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 925 Round Bar
Nickel at 42.0-46.0% is the element responsible for resistance to chloride-induced stress-corrosion cracking. Once nickel exceeds roughly 40%, austenitic alloys become effectively immune to the chloride cracking that limits the use of standard stainless steels in hot brine, which is the principal reason for selecting this alloy over a duplex or austenitic grade in well service.
Chromium at 19.5-22.5% forms the passive film and provides resistance to oxidising media and general corrosion. Molybdenum at 2.5-3.5% works with chromium to resist pitting and crevice attack in chloride environments and improves performance in reducing acids.
The 1.5-3.0% copper is a deliberate addition. It improves resistance in sulphuric and phosphoric acid and in other reducing conditions, where chromium on its own provides little protection.
Titanium at 1.9-2.4% and aluminium at 0.10-0.50% are the age-hardening elements. During the two-stage ageing treatment they combine with nickel to precipitate coherent gamma prime Ni3(Al,Ti) particles throughout the matrix, roughly doubling the yield strength without any loss of corrosion resistance. Titanium also stabilises carbon as titanium carbide, protecting against sensitisation.
Carbon is capped at 0.03% to limit chromium carbide precipitation at grain boundaries, which would locally deplete chromium and reduce intergranular corrosion resistance. Sulphur, silicon and manganese are limited as residuals, with iron making up the balance at a minimum of 22%.
Mechanical Properties for Incoloy 925 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (solution annealed)
760 (typical minimum)
MPa
Yield Strength 0.2% Proof (solution annealed)
380 (typical minimum)
MPa
Elongation in 50 mm (solution annealed)
40 (typical minimum)
%
Hardness (solution annealed)
30 max (typical)
HRC
Tensile Strength (solution annealed and aged)
1140 (typical, grade dependent)
MPa
Yield Strength 0.2% Proof (solution annealed and aged)
758 - 965 (0.2% proof, supplied strength grades)
MPa
Elongation in 50 mm (solution annealed and aged)
20 (typical minimum)
%
Reduction of Area (solution annealed and aged)
35 (typical minimum)
%
Hardness (solution annealed and aged)
32 - 38 (typical range)
HRC
Maximum Hardness for Sour Service
Per NACE MR0175 / ISO 15156-3 for the applicable condition
HRC
Modulus of Elasticity
200 at room temperature (typical)
GPa
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 925 Round Bar
The values listed for Incoloy 925 Round Bar are typical for the two standard delivery conditions, and the exact requirements should be taken from the ordered specification, whether ASTM B805, API 6ACRA or a customer document, since the required yield strength grade is normally stated explicitly on the purchase order.
In the solution annealed condition the alloy is soft and highly ductile, typically around 760 MPa tensile strength with 380 MPa yield and 40% elongation. This condition is used where forming or extensive machining is required, or where maximum corrosion resistance and minimum hardness are needed.
The two-stage ageing treatment precipitates gamma prime and roughly doubles the proof strength. Material is supplied to several strength grades, with 0.2% proof stress commonly falling between about 758 and 965 MPa, tensile strength near 1140 MPa and hardness in the 32-38 HRC band. The grade required must be stated on the order. Ductility falls but remains good, with elongation typically around 20%.
For sour service the governing constraint is usually hardness rather than strength. NACE MR0175 / ISO 15156-3 sets a maximum hardness for the alloy together with limits on hydrogen sulphide partial pressure, chloride concentration, elemental sulphur and temperature. Material aged to too high a strength may exceed the hardness ceiling and be unacceptable, so the ageing cycle is controlled to place hardness reliably within the permitted band.
Testing follows ASTM E8 / E8M for tensile properties and ASTM E18 for hardness.
Dimension / Sizes for Incoloy 925 Round Bar
Dimension / Size
Value
Unit
Diameter (available range)
6 - 400
mm
Standard Length
3 - 6
m
Custom Length
Cut to length on request
-
Diameter Tolerance
Per ASTM B805 or as agreed
-
Length Tolerance
Per ASTM B805 or as agreed
-
Straightness Tolerance
As agreed at time of order
-
End Condition
Square cut, saw cut, chamfered or as ordered
-
Surface Finish
Hot-finished and pickled, peeled, rough turned, cold-drawn, ground, polished
-
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM B805
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 925 Round Bar
Pricing for Incoloy 925 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 Incoloy 925 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
What is Incoloy 925 Round Bar?
What standard does Incoloy 925 Round Bar comply with?
What is the difference between Alloy 825 and Alloy 925?
How is Incoloy 925 heat treated?
What are the key mechanical properties of Alloy 925?
Is Incoloy 925 suitable for sour service?
Why does Alloy 925 resist chloride stress-corrosion cracking?
What sizes and finishes are available?
Request A Quote
Need a specific grade, size or quantity? Get pricing and availability for your requirement.