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0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Z


The American 420 is a simple entry-level quality below 440A. The quality depends on the proper heat treatment. With a few exceptions, this type of steel is rarely used these days.

Origin: USA
Carbon (%): 0,4-0,5
Chrome (%): 12-14
Rockwell (HRC): 54