This design of SAG mill feed chute lasted 9 months seeing 90,000 TPD. It is 600 brinell chrome steel.
With the big liners on the bottom of the chute you need to get a Chevron cast into the top to push the feed out to the sides for the first little while and then as the chevron wears it will start to come back into the centre. This will make the wear life longer and more even on that piece. The 100mm wide x 100mm high chevron need be included in the casting.
Ball Mill Feed Chute Design
https://www.911metallurgist.com/ball-mill-feed-chute