# Rene 41 Forgings (UNS N07041): Rings, Flanges, Bars, Discs and Shafts

UNS N07041 | W.Nr. 2.4973 | AISI 683 | AMS 5712 | AMS 5545 | GE B50T59

Jiangyin Jiangnan Metal Co., Ltd. produces Rene 41 (UNS N07041) open-die forgings to customer drawing at its works in Jiangyin City, Jiangsu Province, China. Available forms include seamless rolled rings, forged rings, flanges, discs, shafts, sleeves, tube sheets and round bars. Rene 41 is a precipitation-hardening nickel-chromium-cobalt-molybdenum superalloy with high strength between 649 C and 982 C (1200 to 1800 F). It is specified for jet engine hot section parts, afterburner hardware, turbine casings and missile components. Forgings are supplied solution treated, or solution treated and aged, ultrasonically tested, with an EN 10204 3.1 mill certificate as standard.

Source page: https://www.steelforgepieces.com/Nickel-Alloy/Rene-41.html

## Rene 41 at a glance

| Item | Value |
|---|---|
| Alloy type | Precipitation-hardening nickel-base superalloy, Ni-Cr-Co-Mo, gamma prime strengthened |
| Developed by | General Electric, 1950s |
| Useful strength range | 649 to 982 C (1200 to 1800 F) |
| Density | 8.25 g/cm3 (0.298 lb/in3) |
| Tensile strength, aged | 1420 MPa min (206 ksi min) |
| Delivery condition | Solution treated, or solution treated and aged to HRC 40 to 45 |
| Forged forms available | Seamless rolled rings, rings, flanges, discs, shafts, sleeves, bushings, tube sheets, blocks, bars |
| Non-destructive testing | Ultrasonic test to EN 10228-3, SEP 1921 or ASTM A388 |
| Certification | EN 10204 3.1 standard, EN 10204 3.2 third party on request |
| Manufacturer | Jiangyin Jiangnan Metal Co., Ltd., Jiangyin City, Jiangsu, China |

## What is Rene 41

Rene 41 is a nickel-based high temperature alloy developed by General Electric. Strength comes from gamma prime precipitates formed by about 3 percent titanium and 1.5 percent aluminium, with solid solution strengthening from roughly 10 percent molybdenum and 11 percent cobalt. Small controlled additions of boron and carbon pin the grain boundaries.

The alloy resists oxidation and jet engine combustion gases up to 982 C (1800 F). It was used for the outer shell of the Mercury space capsule. Current applications include afterburner parts, turbine casings and wheels, high temperature bolting and springs, rocket engine hardware and missile structures.

Two properties affect every Rene 41 order. The alloy work hardens quickly and is hard to machine, and it is sensitive to strain age cracking during welding.

## Rene 41 forged products we manufacture

Parts are forged to the customer drawing at our Jiangyin works. There is no fixed catalogue. Send a drawing or the finished dimensions and we quote forging weight, machining allowance and heat treatment together.

- Rene 41 seamless rolled rings. Ring rolled, heat treated and UT tested.
- Rene 41 forged rings. Upset and punched, contour or rectangular section.
- Rene 41 forged flanges. Weld neck, blind, slip on and special profiles.
- Rene 41 forged discs and pancakes. Turbine wheels, closures, blanks.
- Rene 41 forged shafts and spindles. Straight, stepped and eccentric.
- Rene 41 forged sleeves and bushings. Bored and rough machined.
- Rene 41 forged bars. Round, square and flat, cut to length.
- Rene 41 hollow bars and tubes. Trepanned or bored from solid.
- Rene 41 forged tube sheets. For shell and tube heat exchangers.
- Rene 41 forged blocks. Rectangular and stepped blanks.
- Rene 41 forged valve parts. Bodies, seat rings, stems, plugs.
- Rene 41 forged nozzles. Set in and set on, per drawing.

## Chemical composition of Rene 41 (UNS N07041)

Weight percent, per AMS 5712 and UNS N07041.

| Limit | C | Si | Mn | P | S | Cr | Co | Mo | Ti | Al | B | Cu | Fe | Ni |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 0.06 | - | - | - | - | 18.00 | 10.00 | 9.00 | 3.00 | 1.40 | 0.003 | - | - | Bal. |
| Max | 0.12 | 0.50 | 0.10 | 0.015 | 0.015 | 20.00 | 12.00 | 10.50 | 3.30 | 1.60 | 0.010 | 0.50 | 5.00 | Bal. |

Our mill practice normally holds silicon below 0.20 percent, tighter than the 0.50 percent specification limit. Nickel is the balance. Each heat is checked by optical emission spectrometry and the result is reported on the material certificate.

## Mechanical properties of Rene 41 forgings

Room temperature minimum properties, solution treated and aged.

| Property | Metric | Imperial |
|---|---|---|
| Tensile strength (UTS) | 1420 MPa min | 206 ksi min |
| Yield strength, 0.2 percent offset | 1062 MPa min | 154 ksi min |
| Elongation in 4D | 14 percent min | 14 percent min |
| Hardness after precipitation hardening | HRC 40 to 45 | HRC 40 to 45 |

Rene 41 holds most of its strength to about 871 C (1600 F). Above that, tensile strength drops quickly, while oxidation resistance continues to 982 C (1800 F). For load bearing parts above 870 C, ask for creep rupture data before the design is fixed. Properties also change with the solution temperature used.

## Physical properties

| Property | Value |
|---|---|
| Density | 8.25 g/cm3 (0.298 lb/in3) |
| Melting range | 1307 to 1343 C (2385 to 2450 F) |
| Modulus of elasticity (E) | 218 GPa (31.6 x 10^3 ksi) |
| Modulus of rigidity (G) | 83.4 GPa (12.1 x 10^3 ksi) |
| Thermal conductivity | 9.0 W/m.K |
| Coefficient of expansion, 20 to 538 C | 13.5 um/m.C |
| Electrical resistivity | 131 uohm.cm |
| Magnetic response | Non-magnetic at room temperature |

## Heat treatment of Rene 41 forgings

Mechanical properties change with the solution and ageing treatment, so the route is selected from the property the part needs. A higher solution temperature gives better room temperature ductility and creep rupture strength. A lower solution temperature gives higher tensile strength. Both routes are run in house and recorded on the certificate.

| Route | Solution treat | Age | Selected for |
|---|---|---|---|
| 1, high solution | 1177 C (2150 F), 4 h, air cool | 899 C (1650 F), 4 h, air cool | Ductility and creep rupture strength |
| 2, low solution | 1079 C (1975 F), 4 h, air cool | 760 C (1400 F), 16 h, air cool | Maximum tensile strength |

Precipitation hardening on its own: heat to 760 C (1400 F), hold 16 hours, air cool. Hardness lands in the Rockwell C 40 to 45 range. Where a customer intends to finish machine before ageing, we ship in the solution treated condition and the machining is easier.

## Forging, melting and size capability

Rene 41 is hot worked from about 1149 C (2100 F) and finished between 1010 C and 1038 C (1850 to 1900 F). Forging below the finishing temperature risks cracking, so reheats are planned into every sequence.

| Item | Capability |
|---|---|
| Melting route | EAF plus VOD plus ESR, electroslag remelted. Vacuum melted material to AMS 5713 available on request. |
| Forged rings, outside diameter | 120 to 3000 mm |
| Forged rings, height | up to 800 mm |
| Forged bars, diameter | 30 to 800 mm |
| Shafts, length | up to 6000 mm |
| Single piece weight | 5 kg to 8000 kg |
| Hot working temperature | start 1149 C (2100 F), finish 1010 to 1038 C (1850 to 1900 F) |
| Supply condition | As forged, rough machined, solution treated, or solution treated and aged |
| Machining allowance | Agreed per drawing. Near net contour forging available for high cost alloys. |

Rene 41 is an expensive alloy per kilogram, so we normally quote a near net contour forging rather than a rectangular blank. On rings and discs this reduces input weight against machining from solid.

## Testing and certification

- Chemistry: optical emission spectrometry on every heat, LECO combustion for carbon and sulphur.
- Mechanical test: tensile, yield, elongation, reduction of area and hardness on test coupons heat treated with the parts.
- Ultrasonic testing: to EN 10228-3, SEP 1921 or ASTM A388. The customer specifies class and acceptance level.
- Dye penetrant: on request. Rene 41 is non-magnetic, so DP is the applicable surface method.
- Grain size and microstructure: reported on request.
- Certification: EN 10204 3.1 mill certificate as standard. EN 10204 3.2 witnessed by SGS, BV, TUV or Lloyd's Register on request.
- Traceability: heat number stamped or vibro etched on each piece and carried through to the certificate.

## Where Rene 41 forgings are used

| Sector | Rene 41 components |
|---|---|
| Jet engines | Turbine casings, turbine wheels and buckets, afterburner parts, exhaust structures, high temperature bolting and fasteners |
| Rocket and missile | Combustion chamber hardware, thrust structures, missile body components, nozzle rings |
| Airframe | High speed airframe structure exposed to aerodynamic heating, and historically the Mercury capsule outer shell |
| Industrial gas turbines | Hot section rings and discs, seal rings, torque rings |
| High temperature hardware | Springs, bolts, studs, retaining rings and shafts operating above the range of stainless steel |

## Rene 41 compared with Waspaloy and Inconel 718

These three alloys are the ones most often compared for hot section forgings. Rene 41 has the highest strength, Waspaloy the better weldability, Inconel 718 the lowest cost and the easiest manufacture.

| Criterion | Rene 41 | Waspaloy | Inconel 718 |
|---|---|---|---|
| UNS | N07041 | N07001 | N07718 |
| Tensile strength, aged | 1420 MPa min | 1275 MPa approx | 1275 MPa approx |
| Practical upper service temperature | 982 C | 870 C | 650 C |
| Strengthening phase | Gamma prime, Ti and Al | Gamma prime, Ti and Al | Gamma double prime, Nb |
| Weldability | Difficult, strain age cracking | Moderate | Good, sluggish ageing |
| Machinability | Difficult | Difficult | Moderate |
| Relative cost | Highest | High | Lowest |

## Machining, forming and welding Rene 41

Machining. Rene 41 work hardens quickly and is among the harder nickel superalloys to cut. Use tungsten carbide tooling, low surface speeds and steady feed rates. Keep setups rigid and do not let the tool dwell. Use flood coolant throughout. Rough machining is easier in the solution treated condition, before ageing.

Cold forming. Cold forming is possible but needs high force, and springback is large. Because the alloy work hardens quickly, several small reductions with intermediate anneals work better than one large reduction.

Welding. Rene 41 is sensitive to strain age cracking because of its aluminium and titanium content. Sound welds are made by resistance and electron beam methods. For GTAW, use DC straight polarity with good joint fit up and copper backing bars or water cooled fixtures. The material should be fully solution treated before welding. After welding, solution treat with rapid heating and cooling through the 649 C to 871 C (1200 to 1600 F) range, then age.

## Equivalent designations and alternative names

Rene 41, Rene41, R-41, R41, Alloy R-41, Alloy 41, UNS N07041, Werkstoff 2.4973, AISI 683, Pyromet Alloy 41, Udimet R41, Haynes R-41, AMS 5712, AMS 5713, AMS 5545, AMS 5800 for welding wire, GE B50T59, GE B50TF76C, GE B50TF109C, MSRR 9500/241.

## Frequently asked questions

**What is Rene 41 alloy?**
Rene 41 (UNS N07041, Werkstoff 2.4973) is a precipitation-hardening nickel-chromium-cobalt-molybdenum superalloy developed by General Electric in the 1950s. It holds high strength across the 649 C to 982 C (1200 to 1800 F) range and is strengthened by gamma prime precipitates formed by its titanium and aluminium content. It was used for the outer shell of the Mercury space capsule.

**Which standards cover Rene 41 forgings?**
SAE AMS 5712 covers Rene 41 bars, forgings, flash welded rings and stock for forging. AMS 5713 covers vacuum melted bar, AMS 5545 covers sheet, strip and plate, and GE B50T59 covers sheet, plate, strip, bars and forgings. The alloy is also designated UNS N07041, Werkstoff 2.4973 and AISI 683. Jiangyin Jiangnan Metal Co., Ltd. supplies Rene 41 forgings to AMS 5712 and AMS 5545.

**What is the maximum service temperature of Rene 41?**
Rene 41 keeps useful strength up to about 982 C (1800 F) and resists jet engine combustion gases to the same temperature. Its highest strength is in the 649 C to 982 C (1200 to 1800 F) band. Above about 870 C (1600 F) tensile strength falls off sharply, so continuous load bearing service is normally limited to below that point.

**Which Rene 41 forged shapes can Jiangyin Jiangnan Metal supply?**
Jiangyin Jiangnan Metal Co., Ltd. forges Rene 41 into seamless rolled rings, forged rings, flanges, discs and pancakes, stepped and straight shafts, spindles, sleeves, bushings, hollow bars, tube sheets, blocks, nozzles, valve bodies and seat rings, and round or square bars. Parts are made to customer drawing. Send a drawing or dimensions to sales@steelforgepieces.com or call +86-189-2135-9659 for a quotation.

**How is Rene 41 heat treated?**
Two treatments are in common use. The high solution route is 1177 C (2150 F) for 4 hours, air cool, then age at 899 C (1650 F) for 4 hours, air cool. This gives better room temperature ductility and creep rupture strength. The low solution route is 1079 C (1975 F) for 4 hours, air cool, then age at 760 C (1400 F) for 16 hours, air cool. This gives higher tensile strength. Precipitation hardening at 760 C (1400 F) for 16 hours brings hardness to Rockwell C 40 to 45.

**Is Rene 41 difficult to machine?**
Yes. Rene 41 work hardens quickly, so it is one of the harder nickel superalloys to machine. Tungsten carbide tooling, low surface speeds, rigid setups, heavy positive feed and flood coolant are recommended. Do not allow the tool to dwell. Rough machining is easier in the solution treated condition, before ageing.

**Can Rene 41 be welded?**
Rene 41 is weldable but sensitive to strain age cracking because of its aluminium and titanium content. Weld in the fully solution treated condition, use resistance or electron beam welding where possible, and for GTAW use DC straight polarity with good joint fit up and copper backing or water cooled fixtures. After welding, solution treat with rapid heating and cooling through the 649 C to 871 C (1200 to 1600 F) range, then age.

**What is the density of Rene 41?**
The density of Rene 41 is 8.25 g/cm3 (0.298 lb/in3). Its melting range is approximately 1307 C to 1343 C (2385 to 2450 F) and its modulus of elasticity at room temperature is about 218 GPa (31.6 x 10^3 ksi).

**How does Rene 41 compare with Waspaloy and Inconel 718?**
Rene 41 has the highest room temperature tensile strength of the three when fully aged, about 1420 MPa minimum, and the highest cobalt and molybdenum content, but it is the hardest to weld and machine. Waspaloy has better weldability and similar high temperature capability with lower strength. Inconel 718 is the easiest to weld and machine and the lowest in cost, but its useful strength falls off above about 650 C (1200 F), well below Rene 41.

**What certification comes with Rene 41 forgings from Jiangyin Jiangnan Metal?**
Every Rene 41 forging is supplied with an EN 10204 3.1 mill test certificate covering chemistry, mechanical properties and heat treatment. EN 10204 3.2 third-party certification from SGS, BV, TUV or Lloyd's Register is available on request. Forgings are ultrasonically tested to EN 10228-3, SEP 1921 or ASTM A388 as specified by the customer.

**How do I get a price for a Rene 41 forging?**
Send a drawing, or the dimensions, quantity, specification and required delivery condition, to sales@steelforgepieces.com. You can also call or WhatsApp +86-189-2135-9659. Jiangyin Jiangnan Metal Co., Ltd. is located at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, and quotes worldwide.

## Request a Rene 41 forging quote

Send a drawing, or the dimensions, quantity, specification and delivery condition. You will receive a price, a forging weight and a lead time. Minimum order quantity is 1 piece. We quote in USD, EUR or CNY and ship worldwide.

- Company: Jiangyin Jiangnan Metal Co., Ltd.
- Works: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Phone, WhatsApp and WeChat: +86-189-2135-9659
- Email: sales@steelforgepieces.com
- Hours: Monday to Saturday, 08:00 to 18:00 China Standard Time, UTC+8
- Website: https://www.steelforgepieces.com/

## 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. The works produces forged rings, seamless rolled rings, flanges, shafts, discs, sleeves, tube sheets and bars in carbon steel, alloy steel, tool steel, stainless steel and nickel-based superalloys including Rene 41, Waspaloy, Inconel, Incoloy, Hastelloy, Monel, Haynes and MP alloys. Parts are made to customer drawing, ultrasonically tested and issued with EN 10204 3.1 or 3.2 certification.

## Related nickel superalloy forgings

- Waspaloy, N07001: https://www.steelforgepieces.com/Nickel-Alloy/Waspaloy.html
- Inconel 718, N07718: https://www.steelforgepieces.com/Nickel-Alloy/Inconel-718.html
- Inconel X-750, N07750: https://www.steelforgepieces.com/Nickel-Alloy/Inconel-X-750.html
- Haynes 188, R30188: https://www.steelforgepieces.com/Nickel-Alloy/Haynes-188.html
- Haynes 25 L-605, R30605: https://www.steelforgepieces.com/Nickel-Alloy/Haynes-25.html
- Multimet N155, R30155: https://www.steelforgepieces.com/Nickel-Alloy/Multimet-N155.html
- MP159: https://www.steelforgepieces.com/Nickel-Alloy/MP159.html
- MP35N, R30035: https://www.steelforgepieces.com/Nickel-Alloy/MP35N.html
- Hastelloy X, N06002: https://www.steelforgepieces.com/Nickel-Alloy/Hastelloy-X.html
- Inconel 617, N06617: https://www.steelforgepieces.com/Nickel-Alloy/Inconel-617.html
- Incoloy 901, N09901: https://www.steelforgepieces.com/Nickel-Alloy/Incoloy-901.html
- Monel K-500, N05500: https://www.steelforgepieces.com/Nickel-Alloy/Monel-K-500.html

## Data source and revision

Technical values on this page are taken from AMS 5712, AMS 5545 and published Rene 41 mill data sheets, and reflect the delivery conditions supplied by Jiangyin Jiangnan Metal Co., Ltd. Figures are typical minimums given for guidance. The controlling document for any order is the agreed specification and the material certificate issued with the forging.

Page last reviewed 28 August 2026.