Nimonic 90 Round Bar
➡️ UNS N07090 | EN 2.4632 | AMS 5829 | BS HR2
➡️ 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:
N07090
Wr. No.:
2.4632 / 2.4969
MTC Available:
EN 10204 3.1
Product Description for Nimonic 90 Round Bar
Nimonic 90 Round Bar is made from a wrought, age-hardenable nickel-chromium-cobalt alloy strengthened by titanium and aluminium. It is designated UNS N07090 and is known in Germany as 2.4632 (NiCr20Co18Ti). Bars are covered by UK aerospace specifications such as BS HR 2 and by DIN specifications.
The addition of about 18% cobalt raises the solvus temperature of the strengthening phase and improves creep resistance compared with Nimonic 80A. The alloy was developed for service at stresses and temperatures up to about 920°C.
After solution treatment and ageing, a fine gamma prime precipitate gives high tensile, creep and rupture strength. The 20% chromium base provides good resistance to oxidation and hot corrosion. Nimonic 90 is non-magnetic in both solution-treated and aged states.
Bars are supplied solution treated for machining and forming, or fully heat treated when ready-to-use strength is required. Machining is slower than for stainless steel and needs rigid set-ups, sharp tools and generous coolant.
Common applications include gas turbine blades, discs and forgings, ring sections, hot-working tools, high-temperature springs and bolts, and other parts that must hold their strength at high temperature. It is also used as a filler metal for welding Nimonic 80A. Buyers should state the specification, heat treatment and any stress-rupture or grain size testing on the order. Nimonic 90 is also widely used for hot springs and high-temperature fasteners. Bars are usually bought solution treated for machining and then aged, and many orders include stress-rupture tests to prove creep life before parts go into service.
Common Applications of Nimonic 90 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 Nimonic 90 Round Bar
Standard
Country / Region
Grade
UNS
USA
UNS N07090
DIN 17742 / DIN 17752 / EN
Europe
EN 2.4632 (NiCr20Co18Ti) / 2.4969
BS
United Kingdom
BS HR2 (Nimonic 90)
GB/T 14992
China
GH4090 (GH90)
AFNOR
France
NCK 20TA (AIR 9165), Nc20ATV, NCK 20D
Technical Specification for Nimonic 90 Round Bar
Specification
Value
Unit
Material
Nickel alloy
-
Grade
Nimonic 90 / UNS N07090 / 2.4632
-
Standard
BS HR 2, DIN 17742 (chemistry)
-
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 precipitation hardened
-
Tolerance Standard
Per ordered specification or as agreed
-
Density
8.18
g/cm³
Melting Range
1310–1370
°C
Thermal Conductivity at 20°C
11.5
W/m·K
Coefficient of Thermal Expansion 20–100°C
12.7
µm/m·K
Specific Heat at 20°C
446
J/kg·K
Electrical Resistivity at 20°C
1.18
µΩ·m
Modulus of Elasticity at 20°C
213
GPa
Magnetic Properties
Essentially 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 Nimonic 90 Round Bar
Nimonic 90 Round Bar is ordered to UK aerospace specifications such as BS HR 2, to DIN specifications for 2.4632, or to proprietary mill specifications. The specification controls chemistry, heat treatment, tests and tolerances, so it should be stated on the order.
A common heat treatment is solution treatment at about 1080°C for 8 hours with air cooling, then ageing at about 700°C for 16 hours with air cooling. Other cycles are used for special property balances.
The physical data for Nimonic 90 are reference values for the aged condition.
Nimonic 90 bars are checked for chemistry, tensile strength, hardness and, for turbine work, stress-rupture life. Stress-rupture testing, grain size checks, ultrasonic testing and third-party inspection are common for turbine parts.
Nimonic 90 is often bought against engine maker or aerospace material specifications, which add limits on grain size, cleanliness and stress-rupture life. Copy these requirements into the purchase order rather than only naming the alloy. Heat-treated bars should be marked with the heat treatment batch, and the certificate should record the times and temperatures used. For springs, specify the cold-work level and final ageing cycle.
Cutting and grinding of aged bar should use low-stress methods to avoid surface cracks.
Chemical Composition for Nimonic 90 Round Bar
Element
Symbol
Min
Max
Unit
Carbon
C
-
0.13
%
Silicon
Si
-
1.0
%
Manganese
Mn
-
1.0
%
Sulfur
S
-
0.015
%
Chromium
Cr
18.0
21.0
%
Cobalt
Co
15.0
21.0
%
Titanium
Ti
2.0
3.0
%
Aluminium
Al
1.0
2.0
%
Iron
Fe
-
1.5
%
Copper
Cu
-
0.2
%
Boron
B
-
0.020
%
Zirconium
Zr
-
0.15
%
Nickel
Ni
Balance
-
%
Chemical Composition
View the chemical composition and applicable material limits for Nimonic 90 Round Bar
The composition limits shown are those commonly published for Nimonic 90 in the BS HR series and by the producer. Check the exact limits in the ordered specification.
Chromium at 18–21% provides resistance to oxidation and hot corrosion. Nickel forms the base of the alloy.
Cobalt at 15–21% is the main difference from Nimonic 80A. It lowers the stacking fault energy of the matrix and raises the temperature at which the strengthening phase dissolves. This improves creep and rupture strength at higher temperatures.
Titanium at 2.0–3.0% and aluminium at 1.0–2.0% form the gamma prime phase during ageing, which gives high strength. Carbon forms grain boundary carbides. Boron and zirconium strengthen grain boundaries and improve rupture life. Iron, copper, manganese and silicon are residuals, and sulfur is kept very low. Cobalt at 15–21% is what separates Nimonic 90 from Nimonic 80A. It raises the temperature at which the gamma prime phase dissolves, so the alloy keeps its strength to higher temperatures. Titanium at 2.0–3.0% and aluminium at 1.0–2.0% form the strengthening phase. Iron is held low, at 1.5% maximum, to keep the structure stable.
Boron and zirconium are held to small amounts because they strengthen grain boundaries and improve rupture life.
Mechanical Properties for Nimonic 90 Round Bar
Mechanical Property
Value
Unit
Tensile Strength (solution treated and aged)
1175
MPa
0.2% Proof Strength (solution treated and aged)
800
MPa
Elongation (solution treated and aged)
30
%
Hardness (solution treated and aged)
300–380
HV
Mechanical Properties
Check the key mechanical properties and performance requirements of Nimonic 90 Round Bar
The values shown are reference room-temperature properties for fully heat-treated Nimonic 90 bar and are for guidance only. Mandatory minimum values, test locations and heat treatments are set by the ordered BS HR, DIN or proprietary specification.
In the solution-treated state the alloy is softer and easier to machine. After ageing, gamma prime precipitation raises strength to the levels shown while keeping useful ductility.
The main advantage over Nimonic 80A is higher creep and rupture strength at high temperature, allowing service up to about 920°C at suitable stresses. Stress-rupture testing is often part of the order. Compare the Nimonic 90 certificate with the ordered specification, including the ageing cycle used. The values in the table are reference values for the solution-treated and aged condition and depend on the exact cycle. For hot parts, the real design limits come from creep and stress-rupture data at the service temperature. Hardness is a simple check that ageing has been done. If a part is too soft after heat treatment, it may have been under-aged or overheated. Ask for stress-rupture results on the certificate for turbine parts and springs.
Dimension / Sizes for Nimonic 90 Round Bar
Dimension / Size
Value
Unit
Available Diameter Range (supply capability)
6–200
mm
Standard Length (random)
1–6
m
Custom / Cut-to-Length
Available on request
-
Diameter Tolerance
Per ordered BS HR / DIN / proprietary specification
-
Length Tolerance
Per ordered standard or as agreed (commonly +50 / -0 mm for cut lengths)
-
Straightness Tolerance
Per ordered specification 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 Nimonic 90 Round Bar
Pricing for Nimonic 90 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 Nimonic 90 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
When is Nimonic 90 worth the extra cost over Nimonic 80A?
Why does Nimonic 90 contain cobalt?
Is Nimonic 90 suitable for high-temperature springs?
Which standards cover Nimonic 90 bar?
What heat treatment and machining practice suits Nimonic 90?
What are the limitations of Nimonic 90?
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