A Guide to Alloy die Casting

When it comes to aluminum die casting, we’re considered experts!

The specification of an Alloy die casting for a cast component is based upon the mechanical properties it can achieve. For the designer and purchaser, it is vital to understand that the properties obtained from one particular combination of casting alloy, foundry practice and thermal treatment may not be identical to those achieved with the same alloy in a different foundry or with a different thermal treating source. In all aluminum casting alloys, the percentages of alloying elements and impurities must be controlled carefully. If they are not, characteristics such as soundness, machinability, corrosion resistance and conductivity are affected adversely.

For example, calcium and sodium, within a few thousandths of a percent, can have either a beneficial or detrimental effect upon both the soundness and machinability of alloys containing a high percentage of silicon (Si). Similarly, the use of phosphorus in controlled amounts has a beneficial effect on the hypereutectic aluminum-silicon alloys containing Si in excess of 12%.

Special mechanical properties are obtained in many alloys through accurate control of chemistry, manufacturing and heat treating. Reliable ingot producers can supply foundries with ingot and heat treating specifications designed to obtain specific mechanical properties. However, while certain mechanical properties are improved, it is at the expense of others. For example, tensile and yield strengths can be increased, but this results in lower elongation and higher hardness. Higher elongation and lower hardness result in losses in tensile and yield strengths.

Learn more by reading our complete Aluminum die Casting guide. It’s in a PDF, for easy downloading & printing. Highlights include specifications and other detailed information regarding:

Thermal Treatment
Alloy Choice
Alloy Designations
Alloys 242.0 and A242.0
Alloys 319.0, A319.0, B319.0 and 320.0
Alloy 356.0
Alloy A356.0
Alloys A380.0 and B380.0
Alloys A390.0 and B390.0
Alloy 535.0
Alloy 712.0



When it comes to steel castings, we can help!


Alloy steels are considered to be those steels to which elements, other than carbon, are added deliberately so as to improve mechanical properties, physical properties and/or corrosion resistance. (Plastically deforming or breaking the material measures mechanical properties. Physical properties are those, the measurement of which does not require that the metal be plastically deformed).

The American Iron and Steel Institute has defined alloy steels as containing one, or more, of the following elements in quantities as follows:

  • Manganese above 1.65%
  • Silicon above 0.60%
  • Copper above 0.60%
  • Aluminum up to 3.99%
  • Chromium up to 3.99%

and cobalt, columbium, molybdenum, nickel, titanium, tungsten, vanadium, zirconium, and any other element added to obtain a desired alloying effect.

The effectiveness of any alloying element is greatest when it is completely soluble in the steel. If a particular element forms, or tends to form, a compound with iron or another element present in the steel, the effectiveness of both elements is decreased.

For example, if chromium is added to a carbon steel to increase hardenability, the austenitizing heat treatment must be at a temperature high enough to dissolve the chromium carbides, otherwise the presence of chromium carbides diminishes the effect of both chromium and carbon on increasing harden ability. if you are looking for a die casting china company for your aluminum die casting, alloy die casting, zinc die casting, please send us email