Reddit reviews Starrett KBS1224-10 Bi-Metal Unique High Speed Steel Safe-Flex Hacksaw Frame Blade, 0.025" Thick, 24 TPI, 12" Length x 1/2" Width (Pack of 10)
We found 1 Reddit comments about Starrett KBS1224-10 Bi-Metal Unique High Speed Steel Safe-Flex Hacksaw Frame Blade, 0.025" Thick, 24 TPI, 12" Length x 1/2" Width (Pack of 10). Here are the top ones, ranked by their Reddit score.
Bi-Metal Unique Safe-Flex hacksaw frame bladeMade with a patented solid-state diffusion process with 170 percent more high speed steel weld area and ground teethFor reduced blade fracture, faster cutting and longer life24 Teeth per inchMeasures 12-inches length by 1/2-inches width
Drag a file across the steel, see if it bites into it, or skates across it. if it skates across the steel has been hardened. I do not know why it would come from amazon hardened but anything is possible.
As for the Blades, I have only ever used Starrett blades, in my opinion when I find something that works well for me, I get the if it isnt broke dont fix it mentaility, so I usually use these /dp/B000FCER8Y/ref=sr_1_2?keywords=starrett+hacksaw+blade&qid=1570649165&sr=8-2.
If you do have to anneal the steel, Have a look at this article, it will not only instruct you on how to anneal, but will give you an understanding as to why, so you arent just going through the motions. https://www.instructables.com/id/An-Introduction-to-Heat-Treating-Carbon-Steels-Ann/