Numbering Systems for Alloys. Ref: “Engineering Materials – Properties and Selection”, K.G. Budinski and M. K. Budinski, 7 th ed., Prentice Hall, 2002 (Chap. 8 – 16). How can you tell the others exactly which kind of material you want?. What do these codes mean?. AISI 1020 steel
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Ref: “Engineering Materials – Properties and Selection”, K.G. Budinski and M. K. Budinski, 7th ed., Prentice Hall, 2002 (Chap. 8 – 16)
Indicate the Al content above 99%, e.g. 1040 has 99.40% Al
Second digit designates mill control on specific elements
The last two digits have no significance, except…
The last digit indicates product form: 0 for a casting, 1 for ingot form
Other variations can be denoted by adding more digits after these designations