Open-die forging factory, Jiangyin, Jiangsu, China +86 189 2135 9659 sales@steelforgepieces.com
Jiangyin Jiangnan Metal Co., Ltd. Open-die forgings and seamless rolled rings Request a quotation
Werkstoff-Nr. 2.4634
Chemical name
NiCo20Cr15MoAlTi
Trade name
Nimonic® 105
UNS
N13021
BS
HR3
Delivery standard
DIN 17744
Max service temp.
~950 °C / 1740 °F

Nickel superalloy forgings

2.4634 Forgings: Nimonic 105 Rings, Flanges, Bars and Discs Open-die forged and seamless rolled to your drawing by Jiangyin Jiangnan Metal Co., Ltd.

2.4634 is the European material number (Werkstoff-Nr.) for a wrought nickel-cobalt-chromium superalloy. It is designated NiCo20Cr15MoAlTi in DIN 17744 and is widely known by the trade name Nimonic 105. Molybdenum, aluminium and titanium additions strengthen the alloy, which age-hardens to about 1150 MPa tensile strength at room temperature and is designed for load-bearing service up to about 950 °C (1740 °F).

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu, China. We forge 2.4634 into seamless rolled rings, flanges, discs, shafts, round bars, sleeves, bushings, tube sheets and forged pipe, made to customer drawings, ultrasonically tested and supplied with EN 10204 3.1 or 3.2 certification.

2.4634 holds its strength and creep resistance at temperatures where stainless and alloy steels have already softened. It is specified for gas turbine discs and rings, hot-section fasteners, exhaust valve parts, furnace components and hot working tooling. The alloy has a narrow hot working window and a relative machinability rating of about 14 %, so it needs closer process control than ordinary grades.

2.4634 at a glance

  • Material number2.4634
  • Chemical designationNiCo20Cr15MoAlTi
  • Common namesNimonic 105, Alloy 105
  • Alloy typeγ′ precipitation-hardening superalloy
  • Nominal baseNi bal. / Co 20 / Cr 15 / Mo 5
  • Density8.01 g/cm³ (0.289 lb/in³)
  • Tensile strength, RT1150 MPa (167 ksi)
  • Max continuous service~950 °C (1740 °F)
  • Hot working range1050 to 1200 °C
  • CertificationEN 10204 3.1 / 3.2

What is the chemical composition of 2.4634?

The composition below follows DIN 17744 for NiCo20Cr15MoAlTi. Every heat we supply is verified by spectrographic analysis and reported on the mill certificate.

Chemical composition of 2.4634 / Nimonic 105, weight %
ElementSymbolContent, wt %
NickelNiBalance (approx. 54)
CobaltCo18.0 to 22.0
ChromiumCr14.0 to 15.7
MolybdenumMo4.5 to 5.5
AluminiumAl4.5 to 4.9
TitaniumTi0.9 to 1.5
CarbonC0.12 max
IronFe1.0 max
ManganeseMn1.0 max
SiliconSi1.0 max
CopperCu0.20 max
ZirconiumZr0.15 max
BoronB0.003 to 0.010
SulphurS0.010 max

Melting routes available: EAF + VOD + ESR as standard, VIM + VAR or VIM + ESR for aerospace and other critical service. Please specify the route on your enquiry.

Mechanical and physical properties of 2.4634

Room-temperature mechanical properties, precipitation hardened

Typical mechanical properties, fully heat treated
PropertyMetricImperial
Tensile strength1150 MPa167,000 psi
Yield strength, 0.2 % proof770 MPa112,000 psi
Elongation at break25 %25 %
Hardness, typicalapprox. 34 HRCapprox. 34 HRC

Values are typical for fully heat-treated material and are given for guidance. Acceptance values are agreed per order and reported on the EN 10204 certificate.

Physical and processing data

Physical and processing data for 2.4634
PropertyValue
Density8.01 g/cm³ (0.289 lb/in³)
Maximum continuous service temperatureapprox. 950 °C (1740 °F)
Hot working temperature range1050 to 1200 °C
Machinability ratingapprox. 14 % (relative)
Magnetic responseNon-magnetic in the annealed condition

Heat treatment of 2.4634 forgings

The standard full heat treatment for 2.4634 is a solution treatment followed by two ageing steps, all air cooled:

Standard heat-treatment cycle
StepTemperatureTimeCooling
1. Solution treatment1150 °C4 hAir cool
2. First ageing1050 to 1065 °C16 hAir cool
3. Second ageing850 °C16 hAir cool

We can supply 2.4634 forgings solution treated only, fully heat treated to the cycle above, or to a customer-specified cycle. Please state the required condition on your enquiry.

2.4634 equivalents and cross-reference

2.4634 appears under different designations depending on the standard body. These are the designations most often quoted on drawings and purchase orders:

2.4634 designations across standards
Standard or systemDesignation for 2.4634
EN / DIN material number2.4634
DIN chemical designationNiCo20Cr15MoAlTi
Delivery standardDIN 17744
Trade nameNimonic® 105, Alloy 105
UNS (USA)N13021
ISONW 3021
BS (United Kingdom)HR3
AFNOR (France)NCKD 20ATv
MSRR7017, 7018
AECMAprEN 2179 to 2181
AICMANi-P61-HT

Cross-references are for identification only and are not always an exact substitution. Composition limits and required properties differ between standards, so always confirm against your drawing before ordering. NIMONIC® is a registered trademark of Special Metals Corporation and is used here for identification purposes only.

2.4634 forged product forms we supply

All forms are open-die forged or seamless rolled from a single billet, to your drawing or to a dimensioned sketch. Rough machined, semi-finished and finish-machined deliveries are available.

  • Seamless rolled rings. Ring-rolled, no weld seam, continuous grain flow.
  • Forged flanges. Weld neck, blind, slip-on, long weld neck, custom bore.
  • Forged discs and blanks. Turbine discs, cover plates, blind blanks.
  • Round bar and billet. Forged, peeled, turned or ground.
  • Shafts and spindles. Stepped, eccentric, hollow-bored.
  • Sleeves and bushings. Trepanned or bored hollow forgings.
  • Forged pipe and hollow bar. Heavy-wall, bored from solid.
  • Tube sheets. Heat-exchanger and pressure-vessel tube plates.
  • Valve components. Bodies, stems, seat rings, blocks, wedges.
  • Gear blanks and gear rings. Forged to near net shape.
  • Nozzles and manifolds. Vessel and process connections.
  • Forging rolls and wheels. Furnace and heat-treatment equipment.

Forging capability

Size and weight range for 2.4634 forgings
FormSize rangePiece weight
Seamless rolled ringsOD 200 to 3000 mm, wall 30 to 400 mmup to 3000 kg
Discs and blanksOD up to 1500 mm, thk 30 to 500 mmup to 3000 kg
Round barØ 60 to 800 mmup to 3000 kg
ShaftsØ 80 to 700 mm, length up to 6000 mmup to 3000 kg
Sleeves, bushings, hollowsOD 150 to 1200 mmup to 2000 kg

Sizes outside this range are often possible. Send the drawing and we will confirm. Minimum order is one piece and there is no tonnage minimum on 2.4634.

What is 2.4634 used for?

2.4634 is chosen where a part must carry load at temperatures that would relax or oxidise a stainless steel. Typical applications by industry:

  • Gas and steam turbines. Discs, ring sections, blade roots, bolts and fasteners.
  • Aero engines. Hot-section forgings, casings, high-temperature fastener stock.
  • Power generation. Combustor hardware, transition pieces, hot-gas-path parts.
  • Oil, gas and offshore. Wellhead and Christmas-tree parts, subsea components.
  • Valves. Ball, gate, globe, check and plug valve bodies, stems and seat rings.
  • Furnaces and heat treatment. Rolls, supports, fixtures, retort components.
  • Hot working tooling. Die-casting inserts and cores, hot forming tools.
  • Automotive and engines. Exhaust valves, high-temperature springs.

Testing, inspection and certification

Every 2.4634 order is traceable to its heat number from billet to shipment.

Standard on every order

  • Chemical analysis by spectrometer, reported per heat
  • Mechanical testing: tensile, yield, elongation, reduction of area, hardness
  • Dimensional inspection against the approved drawing
  • Visual and surface examination
  • Material certificate to EN 10204 3.1

Available on request

  • Ultrasonic testing to EN 10228-3, SEP 1921 or ASTM A388
  • Liquid penetrant (PT) and magnetic particle (MT) examination
  • Impact testing, including at low temperature
  • Grain size determination to ASTM E112, macro and micro examination
  • Intergranular corrosion testing
  • Third-party witnessed inspection and EN 10204 3.2 certification (SGS, BV, TUV, Lloyd's and others)
  • Positive material identification (PMI) at despatch
  • DIN 17744
  • EN 10204 3.1
  • EN 10204 3.2
  • EN 10228-3
  • SEP 1921
  • ASTM A388
  • ASTM E112

Frequently asked questions about 2.4634

What is 2.4634?

2.4634 is the European material number for a wrought nickel-cobalt-chromium superalloy designated NiCo20Cr15MoAlTi and delivered to DIN 17744. It contains roughly 54 % nickel, 20 % cobalt, 15 % chromium and 5 % molybdenum, with aluminium and titanium additions that form the γ′ precipitate responsible for its high-temperature strength.

Is 2.4634 the same as Nimonic 105?

Yes. Nimonic 105 is the trade name for the alloy carrying material number 2.4634. The same alloy is listed as UNS N13021, ISO NW 3021, BS HR3 and AFNOR NCKD 20ATv. Composition limits vary slightly between standards, so confirm the specification named on your drawing when ordering.

What is the maximum service temperature of 2.4634?

2.4634 was developed for load-bearing service up to approximately 950 °C (1740 °F). Its useful limit in a given application depends on stress level, required life and the surrounding atmosphere, so creep-rupture data for the actual duty should be reviewed at the design stage.

What forged shapes can be made from 2.4634?

Jiangyin Jiangnan Metal supplies 2.4634 as seamless rolled rings, forged flanges, discs, round bars, shafts, sleeves, bushings, tube sheets, forged pipe, gear blanks and valve components. Parts are forged to customer drawings and can be delivered as-forged, rough machined or finish machined.

What heat treatment do 2.4634 forgings receive?

The standard cycle is 4 hours at 1150 °C with air cooling, followed by 16 hours at 1050 to 1065 °C with air cooling, then 16 hours at 850 °C with air cooling. Forgings can also be supplied solution treated only, or to a customer-specified cycle.

Is 2.4634 difficult to machine?

Yes. 2.4634 has a relative machinability rating of about 14 % and a typical hardness near 34 HRC in the aged condition, placing it among the harder nickel-base alloys to cut. Sharp, positive-rake carbide geometry, rigid setups, low surface speeds and generous coolant are recommended. We can supply rough machined forgings so that only finishing passes remain for your shop.

What certification is supplied with 2.4634 forgings?

Every order ships with an EN 10204 3.1 material certificate covering chemistry, mechanical properties, heat treatment condition and heat number. EN 10204 3.2 certification with third-party witness (SGS, BV, TUV, Lloyd's and others) is available on request, as are ultrasonic reports to EN 10228-3, SEP 1921 or ASTM A388.

What is the minimum order quantity for 2.4634 forgings?

The minimum order is one piece and there is no tonnage minimum. Lead time depends on billet availability and part size, and is confirmed in writing with each quotation. Send a drawing or the dimensions, quantity and required standard to sales@steelforgepieces.com for a quotation.

Can you forge 2.4634 to our drawing?

Yes. Made-to-drawing open-die forging is our normal way of working. Send a PDF, STEP or DWG file with the required specification, heat-treatment condition, testing scope and certification level, and we will return a quotation with the forging route and lead time.

About the manufacturer

Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China.

We forge carbon steel, alloy steel, tool steel, stainless steel and nickel-base superalloys including 2.4634 into rings, flanges, discs, shafts and bars. We work to DIN, EN, ASTM, ASME and JIS specifications and to customer drawings. Enquiries are handled in English and Chinese.

How to cite this page

Jiangyin Jiangnan Metal Co., Ltd. "2.4634 Forgings: Nimonic 105 Rings, Flanges, Bars and Discs." steelforgepieces.com. Last reviewed 8 August 2026.
https://www.steelforgepieces.com/Nickel-Alloy/2.4634.html
Contact: sales@steelforgepieces.com, +86 189 2135 9659

Technical data on this page is compiled from DIN 17744 and published producer datasheets for NiCo20Cr15MoAlTi and is provided for guidance. Acceptance values for a specific order are agreed in the purchase specification and reported on the mill certificate.

Request a quotation for 2.4634 forgings

Send the drawing or the dimensions, quantity, required standard, heat-treatment condition and certification level. We will confirm the forging route, lead time and price by email.