K-alloy A304 Properties - Aluminum Die Cast Alloy - Sunrise Metal


K-Alloy, also known as A304, is a patented die casting aluminum alloy designed to withstand harsh operating conditions. It is one of the most corrosion resistant aluminum alloys used for die casting. It was first developed in 2003 by Delphi Corp. and is exclusively sold by specific suppliers.

Figure-1 K-Alloy Die Casting Aluminum AlloyK-Alloy Characteristics

K-Alloy/A304 is specialized to survive harsh environments. The alloy is known for its enhanced corrosion resistance. K-Alloy castings can withstand up to 3000 hours of salt spray without any notable damage to the surface. This is possible without applying any additional surface finishing.

Therefore, K-Alloy minimizes or eliminates the need for additional finishing operations. So, pre and post-processing like anodizing or painting are not required for K-alloy castings. Moreover, the castings can withstand extreme temperatures, shocks, and vibrations.


K-Alloy/A304 has some unique benefits over other popular commercial alloys such as A360, ADC10, A413, etc. Some of the key benefits include,

  • Has superior corrosion resistance; thus suitable for challenging operating conditions
  • Eliminates the need for additional surface finishing
  • Better thermal conductivity than A380, which also contributes to its cooling properties
  • Exhibits better elongation (5%) than most other aluminum alloys and can be extended up to 8-14% through heat treatment
  • No special equipment or process is required; can be cast like any other die casting alloy
  • Offers extended die life equal to that of A380 alloy


K-Alloy/A304 has multitudes of applications in various industries. Some typical applications of K-alloy include,

  • Parts designed to withstand the harsh under the hood harsh environment of automobiles
  • Electronic device housing for better protection from the outside environment
  • Residential or commercial application of outdoor lighting fixtures
  • Drone, antenna, and radio parts used for military applications
  • Superior thermal properties allow for heat sink applications
  • Ideal for automotive electrification
  • Prevent saltwater damage to recreational equipment used in marine environments such as fishing reels and boat fittings.
Mechanical Properties
Brinell Hardness80 HB
Ultimate Tensile Strength295 MPa
Yield Strength (0.2%)172 MPa
Elongation5 % in 50mm
Elongation (Heat Treated)8-14%

Physical Properties
Melting Point (average)680 °C
Density2.63 g/cm³
Electrical Conductivity32 % IACS
Thermal Conductivity113 W/mK
Alloy Composition
Aluminum (Al)Balance
Silicon (Si)9-11.5 %
Iron (Fe)0.8-1.0 % (max)
Magnesium (Mg)0.35-0.50 %
Manganese (Mn)0.50-0.60 %
Zinc (Zn)0.20 %
Copper (Cu)0.05-0.08 %
Tin (Sn)0.03 % (max)
Nickel (Ni)0.03 % (max)

Get High-Quality K-Alloy Parts from Sunrise-Metal

K-Alloy is an excellent all-purpose aluminum die casting metal alloy. Yet, it is surprisingly economical even though it offers so many benefits. That’s why we provide K-Alloy/A304 die-casting solutions to our customers to ensure high-quality parts at a reasonable price.

If you wish to source K-Alloy/A304 parts for your business, you can get a quote from us.

Our customer support will reach out to you within a day.


Request for Quote or Information
We would be glad to receive your request for quote.
Please email us your detailed requirements including 2D drawing & 3D Model and Quantity.
  • +86-512-55291075
  • +86 13912651818
  • No 1456, Fushikang Rd, Kunshan City, Jiangsu, China
We are close to Shanghai PVG,SHA,& WUX Airportwe can arrange pick-up when you visit us.
Please fill out the form if you have any question.
Scroll to Top