# 2.4634 Forgings: Nimonic 105 Rings, Flanges, Bars and Discs

**Supplier:** Jiangyin Jiangnan Metal Co., Ltd., open-die forging factory
**Address:** No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
**Phone / WhatsApp / WeChat:** +86 189 2135 9659
**Email:** sales@steelforgepieces.com
**Page:** https://www.steelforgepieces.com/Nickel-Alloy/2.4634.html
**Last reviewed:** 8 August 2026

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## What is 2.4634?

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

| Item | Value |
|---|---|
| Material number | 2.4634 |
| Chemical designation | NiCo20Cr15MoAlTi |
| Common names | Nimonic 105, Alloy 105 |
| Alloy type | Gamma-prime precipitation-hardening superalloy |
| Nominal base | Ni balance / Co 20 / Cr 15 / Mo 5 |
| Density | 8.01 g/cm³ (0.289 lb/in³) |
| Tensile strength, room temperature | 1150 MPa (167 ksi) |
| Maximum continuous service | approx. 950 °C (1740 °F) |
| Hot working range | 1050 to 1200 °C |
| Delivery standard | DIN 17744 |
| Certification | EN 10204 3.1 / 3.2 |

## Chemical composition of 2.4634

Composition follows DIN 17744 for NiCo20Cr15MoAlTi, in weight per cent. Every heat is verified by spectrographic analysis and reported on the mill certificate.

| Element | Symbol | Content, wt % |
|---|---|---|
| Nickel | Ni | Balance (approx. 54) |
| Cobalt | Co | 18.0 to 22.0 |
| Chromium | Cr | 14.0 to 15.7 |
| Molybdenum | Mo | 4.5 to 5.5 |
| Aluminium | Al | 4.5 to 4.9 |
| Titanium | Ti | 0.9 to 1.5 |
| Carbon | C | 0.12 max |
| Iron | Fe | 1.0 max |
| Manganese | Mn | 1.0 max |
| Silicon | Si | 1.0 max |
| Copper | Cu | 0.20 max |
| Zirconium | Zr | 0.15 max |
| Boron | B | 0.003 to 0.010 |
| Sulphur | S | 0.010 max |

Melting routes available: EAF + VOD + ESR as standard, VIM + VAR or VIM + ESR for aerospace and other critical service.

## Mechanical properties of 2.4634

Typical values, precipitation hardened, at room temperature.

| Property | Metric | Imperial |
|---|---|---|
| Tensile strength | 1150 MPa | 167,000 psi |
| Yield strength, 0.2 % proof | 770 MPa | 112,000 psi |
| Elongation at break | 25 % | 25 % |
| Hardness, typical | approx. 34 HRC | approx. 34 HRC |

Values are for guidance. Acceptance values are agreed per order and reported on the EN 10204 certificate.

## Physical and processing data for 2.4634

| Property | Value |
|---|---|
| Density | 8.01 g/cm³ (0.289 lb/in³) |
| Maximum continuous service temperature | approx. 950 °C (1740 °F) |
| Hot working temperature range | 1050 to 1200 °C |
| Machinability rating | approx. 14 % (relative) |
| Magnetic response | Non-magnetic in the annealed condition |

## Heat treatment of 2.4634 forgings

Standard full heat treatment is a solution treatment followed by two ageing steps, all air cooled.

| Step | Temperature | Time | Cooling |
|---|---|---|---|
| 1. Solution treatment | 1150 °C | 4 h | Air cool |
| 2. First ageing | 1050 to 1065 °C | 16 h | Air cool |
| 3. Second ageing | 850 °C | 16 h | Air cool |

Forgings can be supplied solution treated only, fully heat treated to the cycle above, or to a customer-specified cycle.

## 2.4634 equivalents and cross-reference

| Standard or system | Designation for 2.4634 |
|---|---|
| EN / DIN material number | 2.4634 |
| DIN chemical designation | NiCo20Cr15MoAlTi |
| Delivery standard | DIN 17744 |
| Trade name | Nimonic 105, Alloy 105 |
| UNS (USA) | N13021 |
| ISO | NW 3021 |
| BS (United Kingdom) | HR3 |
| AFNOR (France) | NCKD 20ATv |
| MSRR | 7017, 7018 |
| AECMA | prEN 2179 to 2181 |
| AICMA | Ni-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.

## 2.4634 forged product forms

All forms are open-die forged or seamless rolled from a single billet, to 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 for 2.4634

| Form | Size range | Piece weight |
|---|---|---|
| Seamless rolled rings | OD 200 to 3000 mm, wall 30 to 400 mm | up to 3000 kg |
| Discs and blanks | OD up to 1500 mm, thickness 30 to 500 mm | up to 3000 kg |
| Round bar | diameter 60 to 800 mm | up to 3000 kg |
| Shafts | diameter 80 to 700 mm, length up to 6000 mm | up to 3000 kg |
| Sleeves, bushings, hollows | OD 150 to 1200 mm | up to 2000 kg |

Sizes outside this range are often possible. Minimum order is one piece and there is no tonnage minimum.

## What is 2.4634 used for?

- 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

## 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 gamma-prime 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 Co., Ltd. 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. Rough machined forgings can be supplied so that only finishing passes remain.

**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 such as SGS, BV, TUV or Lloyd's 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.

**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.

## Request a quotation

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

- Email: sales@steelforgepieces.com
- Phone / WhatsApp / WeChat: +86 189 2135 9659
- Address: No. 1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China

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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.

NIMONIC is a registered trademark of Special Metals Corporation and is used here for identification purposes only.

Citation: 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