I found this about 420J2 stainless.
"Overview:
420 J2 is a general purpose stainless steel containing medium quantity of carbon. It has good corrosion resistance qualities in mild atmosphere, domestic and industrial environments. It is resistant to ammonia, blood, carbonic acid, crude oil, detergent solutions, dilute nitric acid, fresh water, food acids, many petroleum products, steam and vinegar etc. It has good strength and reasonable impact resistant properties in both hardened and tempered conditions as compared to 440 grades.
It is also called Surgical Steel, because it is being used in production of surgical instruments on large scale around the world, due to its good corrosion resistant and easily machining qualities. It is also being used in cutting tools like; Knifes, Daggers, Swords, Haircutting Scissors and Domestic scissors. It’s grinding is easy and it produces a fine, vivid and smooth polished surface.
420 steel, due to its excellent harden-ability, it is capable of getting hardened up to 56 HRC Rockwell or higher depending upon carbon contents. Small sections can be air cooled and larger sections should be oil quenched for maximum hardness."
The number 56 HRC Rockwell says a lot. That's really on the low end of the hardness scale. A quality knife blade would have a Rockwell number of 59-60........... too hard and brittle for rough machete work. 56HRC would be softer and easier to sharpen but easier to dull too. BUT, that's IF the manufacturer heat treated it perfectly for the application. Heat treating adds expense and cheap tools probably skimp in that area.
That being said, for $10.00, you would get a machete that would last a long while for the occasional user and not rust in the process. Baldy, you strike me as a man used to quality tools. A $10.00 machete is about equivalent to a $2.00 set of vise grip pliers. Might work .. might not.
My 2 cents.
Joey