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GH4141 is the current Chinese designation (GB/T 14992) for the precipitation-hardened Ni-Cr-Co-Mo superalloy historically called GH141 in older Chinese drawings and René 41 / Udimet R41 / Haynes R-41 in the West. UNS number is N07041; W.Nr. references include 2.4665 / 2.4973 / 2.4982. It is not a variant of Inconel 718: GH4141 carries Co 10–12% + Mo 9–10.5% + Al+Ti ≈ 4.4–5.3%, giving a high γ′ volume fraction (~40–45%) and a service ceiling around 870℃ long-term stress-bearing, 980℃ oxidation/short-time.
This article locks the chemistry envelope, the governing standards, and the specification-writing rules so a purchase order cannot be ambiguous between “GH141”, “GH4141”, and “René 41”.
1. Chemical Composition (GB/T 14992-2005, wt%)
|
Element |
Min |
Max |
Metallurgical Role |
|---|---|---|---|
|
Ni |
— |
Balance (~50–55) |
FCC austenite matrix, γ′ solvent |
|
Cr |
18.0 |
20.0 |
Cr₂O₃ scale, oxidation to ~980℃ |
|
Co |
10.0 |
12.0 |
Raises γ′ solvus (~1000–1020℃), solid-solution creep strength |
|
Mo |
9.0 |
10.5 |
Strongest solid-solution hardener, retards diffusion |
|
Al |
1.40 |
1.80 |
γ′ [Ni₃(Al,Ti)] former |
|
Ti |
3.00 |
3.50 |
γ′ former, dominant precipitation strengthener |
|
C |
0.06 |
0.12 |
MC/M₂₃C₆ carbides, grain-boundary pinning |
|
Fe |
— |
5.00 |
Impurity-control element, not functional |
|
B |
0.003 |
0.010 |
Grain-boundary cohesion, creep life |
|
Zr |
— |
0.07 |
Grain-boundary purification, persistent ductility |
|
Mn |
— |
0.50 |
Harmful trace control |
|
Si |
— |
0.50 |
Harmful trace control |
|
P |
— |
0.015 |
Grain-boundary embrittler |
|
S |
— |
0.015 |
Hot-shortness control |
|
Cu |
— |
0.50 |
Corrosion/conductivity control |
AMS 5712 / René 41 western limits align closely: C 0.06–0.12, Cr 18–20, Co 10–12, Mo 9–10.5, Al 1.4–1.8, Ti 3.0–3.3 (some specs 3.0–3.5), Fe ≤5, B 0.003–0.010, Zr ≤0.07.
Key chemistry logic:
Co+Mo ≈ 19–22.5% → this is what separates GH4141 from GH4169 (Co≤1, Mo~3). The high refractory loading is why 760–870℃ creep outperforms 718.
Al+Ti ≈ 4.4–5.3% → drives γ′ fraction to ~40–45%, versus ~18–22% in 718.
Fe≤5% → purer Ni-base than 718 (Fe~18), better high-temp coherence but worse cost.
2. Material Standard Cross-Reference
|
System |
Designation |
|---|---|
|
China (current GB/T 14992-2005) |
GH4141 (ISC H41410) |
|
China (legacy drawing) |
GH141 |
|
USA UNS |
N07041 |
|
AMS (sheet/strip) |
AMS 5545 (solution treated), AMS 5596 (some bar/wire cross-refs) |
|
AMS (bar/forging/ring, heat treated) |
AMS 5712 |
|
AMS (bar/forging, solution only for re-HT) |
AMS 5713 |
|
AMS (wire) |
AMS 5800 |
|
DIN / W.Nr. |
NiCr19CoMo, 2.4973, 2.4982 |
|
France (NF) |
NC20KDTA, ATG W2 |
|
ASTM product specs |
ASTM B166/B167/B168 family cross-walk via UNS N07041 (SB-equivalents used in pressure eq.) |
Note: “GH141” and “GH4141” are the same melt. Writing both on a PO is correct; writing only “Rene 41” without UNS N07041 is not acceptable for GB-project traceability.
3. Heat-Treatment State Must Be On The Specification
GH4141 properties are heat-treat dependent. Three classic routes (all per Chinese aerospace/GB or AMS 5712 practice):
Route A (high-temp strength, disk/rotative): 1080℃±10℃ fast cool → 1120℃±10℃×0.5h AC → 900℃±10℃×1–4h AC. Used for maximum 760–870℃ creep.
Route B (high room-temp strength + fatigue): 1080℃±10℃ AC (or oil quench for bar) → 760℃×16h AC. Common for fasteners, rings.
Sheet route: 1180℃×0.5h AC → 900℃×4h AC; or 1080℃ soak + 760℃×16h AC.
Do not accept “GH4141” without temper. Annealed/as-forged Rp0.2 is ~300–400 MPa lower than aged condition; aerospace PO must cite AMS 5712 + heat-treat code, or GB/T 14992 + GJB 1952/3020/3165 + HT route.
4. Typical Properties of Properly Aged Stock
Density: 8.27 g/cm³
Melting range: 1316–1371℃
RT tensile (bar, Route B): Rm 1175–1300 MPa, Rp0.2 880–900 MPa, A₅ ≥12%
760℃ tensile: Rm 870–1000 MPa, Rp0.2 700–800 MPa class
800℃ tensile: Rm ≥735 MPa, Rp0.2 ≥635 MPa
815℃ 1000 h rupture: ~165 MPa class (marginal long-term)
Oxidation: continuous to ~980℃, short-time to 1000–1050℃ in air
Service split: 650–870℃ long-term stress-bearing; 870–980℃ low-stress/short-time/oxidation
5. Specification Writing Rules (PO Checklist)
A conforming line item reads:
GH4141 (GH141 / René 41 / UNS N07041), bar Ø120 mm, VIM+VAR, AMS 5712 condition B (1080℃+760℃×16h), GB/T 14992-2005 H41410, EN 10204 3.1, C 0.06–0.12, Co 10–12, Mo 9–10.5, Fe≤5, S/P≤0.015, UT per GB/T 6402 or ASTM E2375.
Mandatory fields:
New + old Chinese name (GH4141 / GH141)
UNS N07041
AMS or GB HT state (not “solution+age” vague)
Melt route (VIM+VAR for rotor/fastener; VIM+ESR acceptable for static sheet)
Chemistry envelope locked to GB/T 14992 Table values
Product form standard (AMS 5545 sheet / 5712 bar-forging / 5713 re-HT stock)
6. What GH4141 Is Not
Not a ≤650℃ replacement for GH4169 (718 is cheaper, welds better, γ″ wins at 600℃).
Not a weld-friendly thin-sheet combustor alloy (Al+Ti~5% → SAC risk; Hastelloy X / Nimonic 263 own that job).
Not a 980℃ long-term stress-bearing alloy (γ′ solvus ~1000–1020℃, 870℃ is the 10⁴ h creep redline).
Not interchangeable with Waspaloy/GH4738 by temperature alone: both cover 650–815℃, but GH4141 has higher Mo (9–10.5 vs 4.2) and no 845℃ stabilization step in every route; selection is OEM-creep-data driven, not chemistry-similar-driven.
GH4141/GH141/René 41 is a 650–870℃ high-strength precipitation-hardened Ni-Cr-Co-Mo sheet-and-disk alloy whose entire identity sits in the chemistry window Co 10–12 / Mo 9–10.5 / Al+Ti 4.4–5.3 / Fe≤5. Specify it with UNS N07041 + AMS 5712/5545 HT state + GB/T 14992 envelope, and the grade ambiguity disappears.
Shanghai COCESS Special Alloys Co., Ltd. supplies GH4141 (N07041) bar, plate, ring, disk forging with VIM+VAR melt, AMS 5712/5545 or GB/T 14992 + GJB HT routes, and EN 10204 3.1 MTR containing full chemistry and heat-treat curve.
Website: https://en.cocessalloys.com
Email: sales@cocessalloys.com
