1045 vs. 4340
1045 vs. 4340
(OP)
I have a client asking to use 1045 steel in place of our specified 4340 steel. We require 320-360 BHN and our client assures us he can achieve 280-320 BHN with 1045. From what I've read, this seems unlikely. What is a good source for this type of materials information? Thanks!





RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
I would not recommend a water/polymer quench for a gear.
My sources are from information supplied by the Old Line Steel Companies for all the products they made. I would check with your supplier to see if he has tempering curves for the products he sells.
There are several books on heat treatment of steels that have tempering curves. I can recall any titles but you could search the ASM website for information.
RE: 1045 vs. 4340
RE: 1045 vs. 4340
RE: 1045 vs. 4340
If it is straight wear, then 1045 and 4340 (after suitable heat treatment) are going to behave in a similar fashion. If it is tooth fracture, then 4340 will be the far superior grade.
That said, I say that if it is a small run, just go for the 4340 and be done with it.
LewTam Inc.
Petrophysicist, Leading Hand, Natural Horseman, Prickle Farmer, Crack Shot, Venerable Yogi.