Heat Resistant K418b Precipitation Hardened Alloy Bar for Aerospace

Product Description

K418B Alloy

· Product Description

  ZEGOTA's K418B (equivalent to China ISC C84181 / K18B, benchmarked to low-carbon Inconel 713LC modifications) is a premier precipitation-hardening nickel-based cast superalloy engineered for demanding high-temperature, high-stress environments. Solidified and strengthened through coherent phase precipitates along with refractory additions of molybdenum, niobium, and zirconium, K418B demonstrates outstanding creep-rupture strength, exceptional thermal fatigue resistance, and superior structural stability at service temperatures up to 950°C (1750°F).

  ZEGOTA supplies fully traceable, vacuum-induction melted (VIM) K418B materials across versatile formats, including continuous-cast master alloy remelting bars, precision investment castings, hot-rolled plates/blanks, drawn precision wires, and tailor-made CNC turbine components. Manufactured under strict metallurgical supervision and Class 10k/100k clean inspection protocols, our K418B products serve global Tier-1 clients across aerospace gas turbines, automotive turbocharger wheels, marine turbo systems, and advanced additive manufacturing sectors.
 

· Core Technical Advantages & Features

·  Superior High-Temperature Creep & Rupture Strength: Demonstrates remarkable creep-rupture resistance and tensile load-bearing capacity under continuous high-stress thermal regimes up to 950°C (1750°F).
·   Excellent Thermal Shock & Fatigue Resistance: Highly optimized grain structure and low carbon window minimize grain boundary microcracking, delivering extended operational lifetimes in cyclical hot-gas environments.
·  Outstanding Oxidation & Hot Gas Corrosion Resistance: Forms a dense, self-healing chromium-aluminum oxide protective scale on surface boundaries, offering stable protection against high-velocity exhaust combustion gases and sulfur attack.
· Superior Vacuum Investment Castability: Designed with narrow freezing ranges and excellent molten fluidity, enabling precision thin-walled investment casting of intricate turbine aerofoils and integral turbo rotors without micro-shrinkage.
· High-Purity Melting & Traceability: Melted via Vacuum Induction Melting (VIM) with ultra-low gas content (O, N, H) and strict control of tramp elements (Pb, Bi, Sn, Sb), certified by EN 10204 3.1 / 3.2 Mill Test Certificates.
 

· Target Applications

·  Aerospace & Aviation: Gas turbine integral rotor wheels, turbine stator guide vanes, nozzle guide assemblies, turbine shroud rings, and APU hot-section components.
· Automotive & Commercial Vehicles: Heavy-duty turbocharger turbine wheels, variable turbine geometry (VTG) cartridges, and high-performance racing turbo components.
· Marine & Locomotive Turbo Systems: High-boost auxiliary engine turbocharger rotors and marine propulsion power turbine impellers.
· Industrial Gas Turbines & Energy: Microturbine components, burner nozzles, high-temperature heat exchangers, and power-generation expander wheels.
· Additive Manufacturing & Hardfacing: Spherical alloy powder precursor, PTA welding, and thermal spray coating consumables for hot-section wear repair.

 

· Chemical Composition Table (ASTM / AMS Standards wt%)

Element	Symbol	Min (%)	Max (%)
Nickel	Ni	Balance	Balance
Chromium	Cr	11.0	13.0
Aluminum	Al	5.50	6.50
Molybdenum	Mo	3.80	5.20
Niobium	Nb	1.50	2.50
Titanium	Ti	0.40	1.00
Iron	Fe	-	0.50
Zirconium	Zr	0.05	0.15
Boron	B	0.005	0.015
Carbon	C	0.03	0.07
Cobalt	Co	-	1.00
Manganese	Mn	-	0.25
Silicon	Si	-	0.50
Copper	Cu	-	0.50
Phosphorus	P	-	0.015
Sulfur	S	-	0.015

· Mechanical & Physical Properties Table

Property Parameter	Test Condition / State	Metric Value	Imperial Value
Density	Room Temp (20°C)	7.90 g/cm³	0.285 lb/in³
Melting Range	Solidus - Liquidus	1295°C - 1345°C	2363°F - 2453°F
Tensile Strength ($R_m$)	Room Temp (20°C)	≥ 880 MPa (Typical: 900-1050)	≥ 128 ksi
Yield Strength (Rp0.2)	Room Temp (20°C)	≥ 720 MPa (Typical: 750-820)	≥ 104 ksi
High-Temp Tensile (Rm)	At 800°C (1472°F)	≥ 750 MPa (Typical: 800-890)	≥ 109 ksi
High-Temp Tensile (Rm)	At 900°C (1652°F)	≥ 480 MPa	≥ 70 ksi
Elongation at Break (A5)	Room Temp (20°C)	≥ 8.0% (Typical: 10-15%)	≥ 8.0%
Hardness	As-Cast Condition	32 - 38 HRC	300 - 355 HBW
Creep Rupture Life	900°C / 215 MPa	≥ 30 Hours	≥ 30 Hours
Elastic Modulus	Room Temp (20°C)	195 - 205 GPa	28.3 - 29.7 × 10³ ksi
Operating Temperature	High-Stress Turbine Service	Up to 950°C	Up to 1750°F

· Product Forms & Processing Range Table

Product Form	Dimensional Range	Delivery State & Surface Finish	International Standards
Master Alloy Bars & Ingots	• Diameter: Φ40mm - Φ160mm • Length: 500mm - 1500mm • Custom ingot mass: 5kg - 100kg	• Vacuum Induction Melted (VIM) • Peeled, Shot-blasted, Clean Machined Surface	GB/T 14992, HB 5220, ASTM B637, EN 10204 3.1
Precision Castings	• Integral turbine wheels (Φ40-Φ450mm) • Turbine blades, nozzle guide rings • Per 2D / 3D CAD step files	• Vacuum Investment Casting (Equiaxed Grain) • Hot Isostatic Pressing (HIP) treated • Fluorescent penetrant & X-ray inspected	ASTM E192, AMS 2175, ISO 9001, AS9100D
Custom CNC & Machined Parts	• Rotor shafts, discs, nozzles, flanges • Ultra-tight dimensional tolerances (±0.005mm)	• 5-Axis CNC Precision Turned & Milled • Wire EDM cutting, Dynamic Balancing • 100% CMM dimensional verification	OEM/ODM Customer Specifications, ISO 2768
Hot-Rolled Plates & Blanks	• Thickness: 5mm - 40mm • Width: 100mm - 600mm • Cut-to-length custom blocks	• Hot Rolled, Annealed, Pickled / Ground • Ultrasonic (UT) Class A Tested	ASTM B443 equivalent, AMS Custom Criteria
Spherical Powder & Wire	• Powder: 15-53μm (LPBF), 53-150μm (DED) • Wire: Φ0.8mm - Φ3.2mm (Straight / Coil)	• Gas Atomized (VIGA / EIGA), High Sphericity • Bright Drawn, Acid Pickled Surface	ASTM F3055, AWS A5.14, AMS Standards

· Brief Introduction

Zhejiang ZEGOTA Precision Technology Co., Ltd. is a premier, technology-driven pioneer specializing in high-performance specialty alloys, precision metal materials, and advanced additive manufacturing technologies. Leveraging advanced vacuum melting metallurgy, high-precision processing capabilities, and complete laboratory testing suites, ZEGOTA delivers world-class nickel-based superalloys, precision shaped wires, and customized engineered parts that meet the rigorous standards of the global aerospace, marine, medical, and energy industries.