51-
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Translingual[edit]
Etymology[edit]
From AISI and SAE standards nomenclature for iron and steel grades for chromium steels with roughly 1% chromium.
Prefix[edit]
51-
- (metallurgy) Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon.
Usage notes[edit]
It is used in forming a four or five digit term.
- In the four digit form, the remaining two digits attached to the prefix signifying the sub-1% fractional percentage value of the carbon content of the steel. For example, a steel with 0.95% carbon would be graded 5160. (51+60, from 0."60"%)
- In the five digit form, the remaining three digits attached represent the carbon content in hundredths of a percentage, with at least 1% carbon content.