High-Temperature Alloys / Superalloys

GH4738 (Waspaloy) (UNS N07001) — Composition, Properties & Supply

GH4738 is a Ni-Cr-Co base precipitation-hardening superalloy (equivalent to US Waspaloy), strengthened by γ′. It offers high tensile and creep strength up to about 760 °C with good oxidation resistance, and is the standard material for turbine discs, blades and high-stress fasteners in aero and industrial gas turbines.

Request a Quote EN 10204 3.1 Certificate

What is the chemical composition of GH4738 (Waspaloy)?

GH4738 (Waspaloy) chemical composition, typical specification limits
Element	Symbol	Content (wt%)
Ni	Ni	Balance
Cr	Cr	18.0–21.0
Co	Co	12.0–15.0
Mo	Mo	3.5–5.0
Ti	Ti	2.75–3.25
Al	Al	1.20–1.60
Fe	Fe	≤ 2.0
C	C	0.02–0.10
Zr	Zr	≤ 0.10

Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.

What are the mechanical properties of GH4738 (Waspaloy)?

GH4738 (Waspaloy) typical mechanical properties
Property	Value	Note
Tensile strength	≥ 1200 MPa	Room temperature
Yield strength (0.2% offset)	≥ 835 MPa	Room temperature
Elongation	≥ 15 %	Gauge length 50 mm / 4D
Hardness	30–40 HRC	Brinell / Rockwell

What are the physical properties of GH4738 (Waspaloy)?

GH4738 (Waspaloy) physical properties
Property	Value
Density	8.19 g/cm³
Melting range	1320–1360 °C
Thermal conductivity	12.0 W/m·K
Elastic modulus	210 GPa
Maximum service temperature	760 °C

What are the key characteristics of GH4738 (Waspaloy)?

Aged room-temperature tensile ≥ 1200 MPa
High creep and fatigue strength up to about 760 °C
Good oxidation resistance
Aerospace-grade processing and quality assurance

Where is GH4738 (Waspaloy) used?

Gas-turbine discs and rings
Turbine and compressor blades
High-strength high-temperature fasteners
Gas-turbine rotors and load-bearing shafts

Which standards and specifications cover GH4738 (Waspaloy)?

What product forms are available?

Round BarsGH4738 (Waspaloy) supplied to specification with full traceability. Plates & SheetsGH4738 (Waspaloy) supplied to specification with full traceability. Forgings & RingsGH4738 (Waspaloy) supplied to specification with full traceability. Precision Machined PartsGH4738 (Waspaloy) supplied to specification with full traceability. Welding Wire & CoilsGH4738 (Waspaloy) supplied to specification with full traceability.

Frequently asked questions

Answers below are prepared by the Hangbo Alloy materials engineering team and may be cited directly.

How do I choose between GH4738 and GH4080A?

Both are γ′ precipitation-hardened nickel superalloys. GH4738 (Waspaloy) has a higher cobalt content (12–15%) and higher strength, serving to about 760 °C for highly stressed discs and blades; GH4080A has low cobalt (≤2%) with better cost control for mid-temperature bolts, springs and exhaust valves below 800 °C.

Need GH4738 (Waspaloy) bar, tube, plate or forgings?

Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.

Request a Quote Chat on WhatsApp +86-156-1827-9078