T1 heat treating info needed

Bruce Bump

Bruce Bump

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Dec 2, 1999
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At my job we have a huge 225 hp bio-grinder with 50 hard metal teeth. After my inmates ground up a bunch of rocks we find some are broken and need replacement. The 50 they sent are made of T1 and are still soft. I may try the HT myself at home but cant seem to find the formula. Anybody know what it is?
 
Sorry I can't help you there, Bruce. I just have to comment on the "huge 225 hp bio-grinder with 50 hard metal teeth" part. Sounds pretty scary. Big enough to fit a man in it? Will we be watching this on CSI soon?

*shudder*

:eek:
 
High speed steel - T1- .75C, 4.00Cr, 1.00V, 18.00W, .70Mo .Hardening temp -2300-2375F, Temper at 1000-1100F. I have no personal experience with T1 but it has largely been replaced by other types such as M2.....bio grinder ? do you have a T-Rex at work ??
 
Yes this grinder is BIG! It has a 4 ft wide feed belt big enough to put a full size cow on and make hamburger. We use it to grind up wood and brush for our composting facility.

Thanks Mete for the info. I dont think I want to ht high speed steel with the temps up to 2300f. I wonder how long the soak time is for a 2"x2"x1" ? I may be able to throw them in the forge. My oven doesnt go that high. Maybe we will just send them out.
 
That suprises me. It sounds like something similar to what we used in the coal mines on the tail piece of the belts to break up the coal and any rock dirt (coal with rock is called dirty coal) that was mixed with it. I think I am correct that they were carbide tipped replacable bits. These bits fit into a steel chain that rotated about a large drum. They were cylindracious with a belt groove cut near the base for a ring keeper and they tapered to a point of carbide and the bit in whole resembled a large spitzer projectile. Bruce, is this a rock crusher or did I misread?

UHHH, I just looked at Mete's specs.. HAVE FUN. You and I both can't go that high with our ovens. The forge is all you got for that. The oven will do the tempering but,as you asked, what is the soak in the forge? I don't know what the 'W' designation in the chemistry is but what ever it is there is a lot of it.

RL
 
W= Tungten. W comes from the German name (Wolfram). Tungsten was discovered by a German (I think).

Anthony Lasome
 
and there seems to be a heavy amount of it in there.

Thanks for the W. I'll try to remember that. W designates tungsten.

The W seems to be the answer to the mystery. Is that not the reason for the high temperature??

Thanks again.

RL
 
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