Not exactly the same thing roth. What I want to know is would it make sense to use either of these tool steels for an impact application? How do they compare with 4340 for taking an impact? I hadn't considered these before but now the heat treat guy is concerned about 4340 cracking during heat...
I'm making a large impact socket and was planning on using 4340 for it, but wondering if either D2 or H13 tool steel would be any better for this application? I know they are strong but not sure which would take the impact better.
It looks like we won't need the second temper for this material:
https://www.eng-tips.com/viewthread.cfm?qid=172445
You're right about the point of failure Tug, but it's also thicker at that end. We're going to try it, hopefully it's not a waste.
Again at 950F for a couple hours, one right after the other? Or maybe just 1 hour the second time. The thickest part is approximately 2 x 1 inches cross section. But what'll a second temper do to the hardness/strength/impact resistance? Pretty sure the hardness and strength will drop further. If...
True surface hardening probably wouldn't hurt, but not sure if we need it for something that won't get used extensively (about 4 times a month).
But now I have another question: should the part be stress relieved after tempering, and how/when? Will the hardness or strength be affected if, after...
Dave what I'm referring to is the Izod impact energy, which generally increases with tempering temperature.
mfgen 4340 is impact resistant, more so than A-2 I believe. Induction hardening may be a good idea but do impact sockets typically get any surface hardening?
Tmoose, it can't be more than...
Interesting Ed. What I'd like to know now is how temper time affects toughness. Hardness tends to drop the longer you temper, so does toughness increase correspondingly? And does it make sense to double temper something like this?
Tug are you implying our 1-1/2" impact driver isn't beefy enough?
Ed,
Thank you, I'm not familiar with 4335 but I'm thinking the 4340 is probably best for strength as well as impact/fracture resistance. The walls are 9/16" thick. I found an old ASM book on heat treatment and it looks like normalizing at 1600F, quenching from 1525-1575F and tempering 2 hours at...
Anyone familiar with impact socket design? I'm making a 7" ID 8" deep impact socket for a lock nut and not sure about the heat treatment/hardening/tempering. Does a hardness of HRC43-45 sound right? It'll be made out of 4140 or possibly 4340.
