440 stainless steel plate is divided into 440A、440B、440C.
The carbon content and hardness were increased by A-B-C.（A-0.75%,B-0.9%,C-1.2%）.
440C is a very good high-end stainless steel. Hardness is usually up to 56-58Rc. All three have a good rust resistance, 440A is the best, while 440C is the lowest.
440C Stainless Steel Plate Application：
SOG SEAL 2000 used 440A, Randall uses 440B to produce stainless steel knives.440C is very common, probably the second most commonly used stainless steel.
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