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K403
DLX
Customized
ISO9001, ROHS
10PCS
10-25 days
Nickel-based casting superalloy
Product Description
K403 is a first-generation polycrystalline nickel-based casting superalloy used for components exposed to high temperature, mechanical loading and repeated thermal cycles.
The alloy has a nickel-chromium matrix strengthened by a substantial volume fraction of γ′ precipitates. Aluminum and titanium promote the formation of Ni₃(Al,Ti)-type γ′ strengthening phases, while tungsten and molybdenum provide solid-solution strengthening. Carbon, boron and zirconium contribute to carbide formation and grain-boundary behavior.
K403 also contains a controlled cobalt addition. Unlike K418, K403 is not normally described as a cobalt-free alloy.
Its combination of strength and castability makes K403 suitable for vacuum investment casting of complex equiaxed components. Final performance nevertheless depends on master alloy cleanliness, remelting practice, shell and pouring conditions, solidification rate, casting defects, heat treatment and component geometry.
Specification
Property |
Value |
|---|---|
Material Grade |
K403 Nickel-Based Superalloy |
Industry Standard |
GB/T 14992, Aerospace Grade |
Melting Method |
Vacuum Induction Melting (VIM) |
Density |
8.1 g/cm³ |
Solidus Temperature |
1260 °C |
Tensile Strength (900°C) |
≥ 600 MPa |
Stress Rupture (900°C/196MPa) |
≥ 40 Hours |
Phase Structure |
γ' Precipitate Hardening |
Chemical composition%
Element |
Cr |
Co |
W |
Mo |
Al |
Ti |
B |
Fe |
Ni |
|---|---|---|---|---|---|---|---|---|---|
Content (%) |
11.0-13.0 |
9.0-11.0 |
4.5-6.0 |
3.5-5.0 |
5.0-6.0 |
2.0-3.0 |
0.01-0.02 |
≤ 1.0 |
Bal |
Aerospace-Grade Thermal Stability: Designed to maintain high rupture strength and creep resistance during long-term service at 900°C.
Optimized Castability: Superior fluidity and low inclusion content enable the casting of intricate internal cooling channels in turbine vanes.
VIM Vacuum Extraction: Advanced melting process removes harmful low-melting-point trace elements, ensuring ultra-clean alloy quality.
Excellent Thermal Fatigue Life: High resistance to crack initiation under rapid thermal cycling in gas turbine start-stop environments.
Strict Impurity Control: Controlled levels of Pb, Bi, Sn, and Sb to prevent premature grain boundary embrittlement at elevated temperatures.
Applications
K403 is used for conventionally cast turbine rotor blades that require high-temperature strength and creep resistance. Rotating-blade service is commonly associated with temperatures below approximately 900°C, subject to the qualified component design.
Stationary guide vanes can operate at higher gas-path temperatures than rotating blades because their mechanical loading is different. K403 has been applied to guide-vane components at application-dependent temperatures approaching 1000°C.
Industrial turbine foundries may use K403 feedstock for rotating and stationary hot-section parts exposed to heat, oxidation and sustained mechanical loading.
Subject to aerospace qualification, process approval and full traceability, K403 can be used for aircraft-engine castings requiring controlled chemistry and repeatable investment-casting performance.
DLX Advantage
CHANGZHOU DLX ALLOY CO, LTD was established in 2002 and has got ISO9001 International Quality Management System Certificate and SGS Certificate. DLX Alloy supplies nickel-based casting master alloys for precision foundries and high-temperature component manufacturers.
Our K403 supply program can be configured around the customer’s target chemistry, furnace charge size, casting process, documentation and delivery requirements. Heat-level identification supports traceability from alloy production through packing and shipment.
FAQ
K403 is an equiaxed, precipitation-strengthened nickel-based casting superalloy. It contains chromium, cobalt, tungsten, molybdenum, aluminum and titanium and is used for high-temperature precision castings such as turbine blades and guide vanes.
K403 is primarily a casting alloy. Bars supplied under this product category are normally master alloy or remelting feedstock rather than wrought bars intended for direct machining or forging.
K403 alloy bar is remelted by investment foundries to produce high-temperature components. Typical finished castings include turbine rotor blades, guide vanes and other gas-turbine hot-section parts.
It should not be assumed to be a finished structural bar. Its intended use is controlled remelting and casting. A customer requiring directly machined bar stock should select an appropriate wrought nickel alloy.
K403 rotating turbine blades are commonly associated with service below approximately 900°C. Stationary guide vanes may be used at application-dependent temperatures approaching 1000°C. Actual limits depend on stress, time, atmosphere, coating, microstructure and component qualification.
