The alloying system for aluminum uses a rational numbering system.  UNS and the Aluminum Association (AA) parallel each other in their numbering system.  For example, AA designates A356.0, UNS uses A13560.  The UNS system breaks down as follows

First Digit (A)

• An alpha indicator of base metal.  Always A for aluminum.

Second Digit (1)

• Indicates a modification of the original alloy.  Was previously indicated by alpha letter.

Third Digit (3)

• Designates alloy family
  • 1XX 99% Aluminum
  • 2XX Copper
  • 3XX Silicon w/ copper and/or Magnesium
  • 4XX Silicon
  • 5XX Magnesium
  • 6XX Unused
  • 7XX Zinc
  • 8XX Tin
  • 9XX Others

Fourth and Fifth Digits (56)

• Assigned ID number for the particular alloy.

Sixth Digit (0)

• O Casting Specification
• 1 Ingot Specification
• 2 More Tightly Refined Ingot Specification

              
     
      St Paul Brass and Aluminum Foundry   -   954 West Minnehaha Avenue, St. Paul, MN  55104  -  (651)488-5567  -  (800)348-1649  -   Fax: (651)488-0908
      E-mail us for Free Video and Free Casting Design and Alloy Selection Guide or To Discuss Your Casting Project


St. Paul Brass and Aluminum Foundry is a charter honoree of the Inc 5000:

Search WWW Search spba.net

website creation by Tim Hartigan ©2007   Hosted by webhost4life