High-performance alloy material for industrial engineering and critical application conditions.
1. Introduction to GH4169 Materials
GH4169 corresponds to foreign grades Inconel718 (USA) and NC19FeNb (France). It is a precipitation-strengthened wrought nickel-based superalloy with excellent comprehensive performance for long-term service within -253~650℃, short-term service temperature up to 800℃. Its yield strength below 650℃ ranks top among wrought superalloys. It possesses outstanding fatigue resistance, radiation resistance, oxidation resistance, corrosion resistance, superior machinability, weldability and stable long-term microstructure. It can be fabricated into complex shaped components, widely applied in aerospace, nuclear energy, petrochemical industry and extrusion molds. Available products: hot rolled & forged bars, cold drawn bars, hot rolled plates, cold rolled plates, strips, wires, seamless tubes, welded tubes, forgings.
2. Chemical composition of GH4169
| Category | C | Cr | Ni | Co | Mo | Al | Ti | Fe | |
| Standard grade | ≤0.08 | 17.0~21.0 | 50~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Bal | |
| High-quality grade | 0.02~0.06 | 17.0~21.0 | 50~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Bal | |
| High-purity grade | 0.02~0.06 | 17.0~21.0 | 50~55.0 | ≤1.0 | 2.80~3.30 | 0.30~0.70 | 0.75~1.15 | Bal | |
| Category | Nb | B | Mg | Mn | Si | P | S | Cu | Ca |
| Limit | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | |
| Standard grade | 4.75~5.50 | 0.006 | 0.01 | 0.35 | 0.35 | 0.015 | 0.015 | 0.3 | 0.010 |
| High-quality grade | 5.00~5.50 | 0.006 | 0.01 | 0.35 | 0.35 | 0.015 | 0.015 | 0.3 | 0.010 |
| High-purity grade | 5.00~5.50 | 0.006 | 0.005 | 0.35 | 0.35 | 0.015 | 0.015 | 0.3 | 0.005 |
| Category | Bi | Sn | Pb | Ag | Se | Te | Tl | N | O |
| Limit | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ | ≤ |
| Standard grade | — | — | 0.0005 | — | 0.0003 | — | — | — | — |
| High-quality grade | 0.001 | 0.005 | 0.001 | 0.001 | 0.0003 | — | — | 0.01 | 0.010 |
| High-purity grade | 0.00003 | 0.005 | 0.001 | 0.001 | 0.0003 | 0.00005 | 0.0001 | 0.01 | 0.005 |
3. GH4169 physical properties
| Density | 8.24g/cm³ |
| Melting point | 1260~1320℃ |
| Magnetic property | Non-magnetic alloy |
Minimum room-temperature mechanical properties of the alloy:
| Alloy state | Tensile strength Rm N/mm² | Yield strength RP0.2 N/mm² | Elongation A5 % | Brinell hardness HB |
| Solid solution state | ≥965 | ≥550 | ≥30 | ≤363 |
4. GH4169 smelting process
GH4169 adopts multiple dual/multi-stage smelting processes: vacuum induction melting + electroslag remelting; vacuum induction melting + vacuum arc remelting; vacuum induction melting + electroslag remelting + vacuum arc remelting; vacuum induction melting + vacuum arc remelting + electroslag remelting.
5. GH4169 material characteristics
It maintains high tensile strength, fatigue strength, creep strength and rupture strength at 700℃, and excellent oxidation resistance up to 1000℃.
Stable chemical properties and excellent low-temperature weldability. GH4169 exhibits outstanding resistance to stress corrosion cracking and pitting corrosion under both high and low temperature environments, together with superior high-temperature oxidation resistance.
The matrix metallographic structure of GH4169 is austenite. Precipitation hardening generates γ strengthening phase for excellent mechanical properties; grain boundary δ phase formed during heat treatment endows the alloy high plasticity.
6. Technical standards of GH4169 materials
GB/T14992 Classification and Grade of High Temperature Alloys and Intermetallic Compounds
GJB2611A Specifications for Cold Drawn Rods for Aviation High Temperature Alloys
GJB2612 Specifications for Cold Drawn Welding Wires of High Temperature Alloys for Aviation
GJB3318A Specifications for Cold Rolled Strips for Aviation High Temperature Alloys
GJB3527 Specifications for Cold Drawn Spring Wires of High Temperature Alloys
GJB5280 Specifications for Aero-engine Superalloy Disk Forgings
GJB5301 Specifications for Aero-engine Superalloy Ring Components
GJB712A Specifications for Aerospace Forged Round Billets
HB 6702-1993 GH4169 Alloy Rods for WZ8 Series Engines
Q/6S 1034-1992 GH4169 Alloy Rods for High Temperature Fasteners
Q/3B 548-1996 GH4169 Alloy Forgings
Q/3B 4048-1993 YZGH4169 Alloy Rods
Q/3B 4050-1993 GH4169 Alloy Rods
Q/3B 4051-1993 GH4169 Alloy Wires
7. GH4169 application fields
1. Static and rotating structural parts for aero & aerospace engines: disks, rings, casings, shafts, blades, fasteners, elastic elements, gas pipelines, sealing parts and welded assemblies;
2. Industrial elastic components and grid parts;
3. Structural components for petroleum and chemical equipment.
