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Tools from Jack hammer Bits


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Grant, what is 9260? I know the material was a little stout to work, not as tough as H13 or S7 but it seemed a little stouter than 4140 and 5160 of the same dimension. I'm talking about the way it yeilds to the hammer. The working ends were no good to use. They had stress fractures in them, but every thing else seemmed to be fine, and the tools have been holding up well. I assume the 60 is the carbon, but what is the 92?

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It's an AISI steel with a very similar chemistry to S-5 tool steel. Around 2% silicone and .75% manganese and .60 carbon. Nice stuff for tools. Yes, it feels plenty hard under the hammer. I agree, 4140 and 5160 feel pretty similar, but you can tell when you got 9260. Hardens best in oil from about 1650 (nice red-orange). Peacock temper works for most things. Water quench from a little lower temperature often works good too. Better about than the other two.

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Grant:

Since you are obviously knowledgeable about various alloys. A friend gave me a bunch of "digger links" . These are 5/8" dia. rods that come from the digging part of a potato harvester. (Yeah, he's from Idaho!) They seem to be tough and will harden quite hard in water. They make nice chisels, punches and the like. I have a bending dog that I use that is just a length of the rod with the link end left as it comes from the factory.
Can you speculate on the alloy?
sad.gif

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