Inconel 625 Round Bar
➡️ Alloy 625 | UNS N06625 | EN 2.4856
➡️ 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:
N06625
Wr. No.:
2.4856
MTC Available:
EN 10204 3.1
Product Description for Inconel 625 Round Bar
Inconel 625 is a nickel-chromium-molybdenum alloy with a niobium addition, UNS N06625 and Werkstoff 2.4856. Bar is delivered against ASTM B446 with ASME SB-446 for pressure equipment and ASTM B564 for forgings.
The composition is nickel 58% minimum, 20-23% chromium, 8-10% molybdenum and 3.15-4.15% niobium plus tantalum. Molybdenum and niobium together provide solid-solution strengthening that makes this one of the strongest alloys available without any hardening heat treatment, and the same molybdenum gives outstanding resistance to pitting and crevice corrosion, with a pitting resistance equivalent around 50.
It is close to universally corrosion resistant in seawater and handles a wide span of acids, both oxidising and reducing, along with strong resistance to chloride stress corrosion cracking from the high nickel content.
ASTM B446 defines two grades. Grade 1 is annealed at 871-1038 C and gives 827 MPa minimum tensile. Grade 2 is solution annealed at 1093 C minimum, giving 690 MPa minimum tensile with better creep resistance for service above about 600 C. The grade must be stated on the order.
One caution applies. Prolonged exposure between roughly 650 C and 900 C can precipitate carbides and intermetallic phases that cut ductility and toughness, so the alloy is not intended for long-term service in that band even though its oxidation limit sits higher.
Bar comes in 6 mm to 250 mm, in mill or cut lengths. The alloy is non-magnetic and cannot be hardened by heat treatment, so more strength has to come from cold working.
Typical work is subsea and offshore hardware, seawater systems, flue-gas desulphurisation, chemical process equipment, aerospace ducting and downhole components.
Common Applications of Inconel 625 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 625 Round Bar
Standard
Country / Region
Grade
ASTM B446
USA
UNS N06625 Grades 1 and 2 (rod and bar)
ASME SB-446
USA
UNS N06625
ASTM B564
USA
UNS N06625 (forgings)
DIN 17744
Europe / EU
2.4856 (NiCr22Mo9Nb)
BS 3076
United Kingdom
NA 21
Technical Specification for Inconel 625 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
Inconel 625 / UNS N06625 / 2.4856
-
Product Form
Round bar / rod
-
Standard
ASTM B446 Grades 1 and 2, ASME SB-446
-
Diameter
6 - 250 (typical supply range)
mm
Length
3 - 6 (random), or cut to length
m
Manufacturing Process
Hot rolled or forged, annealed or solution annealed
-
Production Route
EAF + AOD with VIM or ESR remelt where specified
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Heat Treatment / Delivery Condition
Grade 1 annealed 871-1038 C, Grade 2 solution annealed 1093 C minimum
-
Tolerance Standard
ASTM B446 permissible variations
-
Density
8.44 (typical)
g/cm3
Melting Range
1290 - 1350 (typical)
C
Thermal Conductivity at 20 C
9.8 (typical)
W/m.K
Coefficient of Thermal Expansion (20-100 C)
12.8 (typical)
um/m.C
Specific Heat (0-100 C)
410 (typical)
J/kg.K
Electrical Resistivity at 20 C
1.29 (typical)
uOhm.m
Modulus of Elasticity at 20 C
208 (typical)
GPa
Magnetic Properties
Non-magnetic
-
Pitting Resistance Equivalent (PREN)
Approximately 50 (typical, calculated)
-
Maximum Service Temperature
980 (typical, oxidising atmosphere)
C
Testing / Inspection Standard
ASTM E8 or ASTM A370 for mechanical testing, ASTM G48 where specified
-
Certification / Inspection Documents
EN 10204 3.1 or 3.2 mill test certificate, NACE MR0175 compliance on request
-
Technical Specifications
Get the key technical specifications for Inconel 625 Round Bar
Buy to ASTM B446 under UNS N06625, with ASME SB-446 for pressure-retaining components and ASTM B564 for forgings. Dimensional tolerances come from the permissible variations within B446.
The two grades are the thing to get right at order stage. Grade 1 is annealed at 871-1038 C and delivers the higher room-temperature strength, 827 MPa minimum tensile strength with 414 MPa minimum proof strength. Grade 2 is solution annealed at 1093 C minimum, which coarsens the grain and drops strength to 690 MPa and 276 MPa, but gives materially better creep and stress-rupture performance. Grade 1 suits ambient and moderate-temperature corrosion service. Grade 2 is for sustained service above roughly 600 C. Composition is identical, so only the mechanical results distinguish them.
One metallurgical caution applies. Prolonged exposure between roughly 650 C and 900 C can precipitate carbides and intermetallic phases that reduce ductility and toughness, so the alloy is not intended for long-term service in that band even though its oxidation limit is higher.
Machining is demanding. The alloy is strong, tough and work hardens rapidly, so rigid setups, sharp tooling, heavy positive feeds and slow speeds are essential.
Welding uses matching ERNiCrMo-3 filler and is straightforward by nickel alloy standards, with no post-weld heat treatment normally required.
Chemical Composition for Inconel 625 Round Bar
Element
Symbol
Min
Max
Unit
Nickel
Ni
58.0
-
%
Chromium
Cr
20.00
23.00
%
Molybdenum
Mo
8.00
10.00
%
Niobium plus Tantalum
Nb+Ta
3.15
4.15
%
Iron
Fe
-
5.00
%
Cobalt
Co
-
1.00
%
Carbon
C
-
0.10
%
Manganese
Mn
-
0.50
%
Silicon
Si
-
0.50
%
Aluminium
Al
-
0.40
%
Titanium
Ti
-
0.40
%
Phosphorus
P
-
0.015
%
Sulfur
S
-
0.015
%
Chemical Composition
View the chemical composition and applicable material limits for Alloy 625 Round Bar
Molybdenum at 8.00-10.00% does double duty and is the reason this alloy is so widely specified. It strengthens the nickel matrix in solid solution, contributing much of the alloy’s unusually high strength for a non-hardenable material, and it also strengthens the passive film against localised breakdown, giving resistance to pitting and crevice corrosion that puts the pitting resistance equivalent near 50.
Niobium plus tantalum at 3.15-4.15% adds further solid-solution strengthening and stabilises carbon, which is what allows the alloy to be welded without post-weld heat treatment while retaining resistance to intergranular attack.
Chromium at 20.00-23.00% generates the passive skin and provides oxidation resistance and performance in oxidising acids such as nitric.
Nickel at 58% minimum gives resistance to chloride stress corrosion cracking and strong performance in reducing acids and caustic conditions. The combination of high chromium and high nickel is what makes the alloy effective in both oxidising and reducing environments, which few materials manage.
Iron is capped at 5.00% and cobalt at 1.00%, both as controlled residuals. Carbon at 0.10%, phosphorus and sulphur at 0.015% each, and aluminium and titanium at 0.40% each are held low to protect weldability and corrosion behaviour.
Mechanical Properties for Inconel 625 Round Bar
Mechanical Property
Value
Unit
Tensile Strength, Grade 1, diameter up to 101.6 mm
827
MPa (minimum)
Yield Strength 0.2% Proof, Grade 1, diameter up to 101.6 mm
414
MPa (minimum)
Tensile Strength, Grade 1, diameter over 101.6 to 254 mm
758
MPa (minimum)
Yield Strength 0.2% Proof, Grade 1, diameter over 101.6 to 254 mm
345
MPa (minimum)
Elongation in 50 mm, Grade 1
30
% (minimum)
Tensile Strength, Grade 2 solution annealed
690
MPa (minimum)
Yield Strength 0.2% Proof, Grade 2 solution annealed
276
MPa (minimum)
Elongation in 50 mm, Grade 2
30
% (minimum)
Modulus of Elasticity
208
GPa (typical)
Mechanical Properties
Check the key mechanical properties and performance requirements of Alloy 625 Round Bar
ASTM B446 sets these, shown against grade because the two differ substantially. All are minima and testing follows ASTM E8 or ASTM A370.
Grade 1, annealed at 871 C minimum, reaches 827 MPa minimum tensile strength with 414 MPa minimum proof strength in bar up to 101.6 mm diameter. From 101.6 mm through to 254 mm the requirement falls to 758 MPa and 345 MPa. That banding tracks section size as it does in quenched and tempered bolting, so design must use the figures for the actual diameter rather than the headline number.
Grade 2, solution annealed at 1093 C minimum, drops to 690 MPa and 276 MPa because the higher treatment coarsens the grain. What it gains is creep and stress-rupture performance, which is why it is the correct choice for sustained service above roughly 600 C. Choosing Grade 1 for hot service because it looks stronger on paper is a common and costly mistake.
Both grades require 30% minimum elongation, so ductility is fully retained in either condition.
The alloy cannot be hardened by heat treatment, and cold work is the only route to higher strength.
Toughness is excellent and holds down to cryogenic temperatures, with no ductile-to-brittle transition.
Dimension / Sizes for Inconel 625 Round Bar
Dimension / Size
Value
Unit
Diameter
6 - 250
mm
Standard Length
3 - 6 (random / mill lengths)
m
Custom Length
Cut to length available on request
-
Diameter Tolerance
Per ASTM B446 permissible variations, varies with size and finish
-
Length Tolerance
Per ASTM B446 or as agreed at order
-
Straightness Tolerance
Per ASTM B446 or as agreed at order
-
End Condition
Square cut, chamfered, or as ordered
-
Surface Finish
Hot-rolled and pickled, peeled, turned, centreless ground, polished
-
Available Size Range
6 - 250, larger diameters by forging on enquiry
mm
Cut-to-Length Availability
Available
-
Dimensional Standard
ASTM B446
-
Dimensions & Sizes
Explore available diameters, lengths, and dimensional requirements for Alloy 625 Round Bar
Pricing for Inconel 625 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
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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 Inconel 625 Round Bar?
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What are the equivalent grades of Inconel 625 Round Bar?
What are the key mechanical properties of Inconel 625 Round Bar?
How corrosion resistant is Inconel 625?
Can Inconel 625 be welded?
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