71 Rockwell C CPM REX 121 blade vs. brick

A customer of mine, going by the handle @pm2og on Instagram, decided to put one of my Rex121 blades at 71 HRC to the test.
This is what proper heat treat can do folks.
DISCLAIMER: DO NOT REPEAT THIS!

[kknives_switzerland]

DISCLAIMER: DO NOT REPEAT THIS!
A customer of mine, going by the handle @pm2og on Instagram, decided to put one of my Rex121 blades at 71 HRC to the test.
This is what proper heat treat can do folks.

[Nudel-nccp]

Yikes
I didn't expect this to be honest. Well done.

[ZiegenMeisterV]

this is exactly what this steel's weakness is supposed to be^^ at least it didn't completely shatter so not too bad

[lars]

Bet you were clenching the cheeks together watching this one😆 I know I was!

[stephan]

Stark, also das die Schockbelastung so gut aufgefangen wurde. 🙂

[philipp]

Kinda important to know what heat treatment protocol was used .. but not so surprising the hardness is conservative for that steel.

[verdigrissirgidrev]

Das ist schon impossant, allerdings wäre es aufschlüssiger, zu sehen, wie oft man das machen kann, bis das Messer aufgrund der angesammelten Gitterdefekte durchbricht bzw. Ausbrüche bekommt. Selbst mit einem Gummihammer dürfte das ja an der Schneide irgendwann so laufen.

[luciusirving]

Not as tough as S7 for masonry, but this Rex 121 handled it alright.

[TimJohnson-xo]

thats a gimmick. reminds me of BBB plucking hardwood and making dramatic cracking sounds. These are not real tests of toughness, they are parlor tricks. Go ahead and gently tap that edge on the lip of a glass or a steel mug and see what happens. Forget the dramatic hammer. Gently tap the edge onto the corner of that brick and see what happens. Strength and toughness are not the same thing. Harder steel is stronger. Harder steel is also less tough.

[sharpfactory]

Rex 121 auf 71hrc und so zäh das ist unglaublich. Das Messer sollte eigentlich komplett zerspringen