Parkerbender
Stainless
- Joined
- Dec 19, 2009
- Location
- Kansas City Mo, USA
We have been making a product that gets these 3/4" ball, m10 thread ball studs. They always break. Out of like 64 studs maybe three or four per batch break. Doesn't matter if they are sitting in a driveway or running them over the edge of a cliff, and they also break in seemingly random places. We started with 12l14 because this application should only see 500-700lbs. We have worked from there, through 1045, 1144, hardened 1144 to 50rc, 4140, 4140 @ 50rc, 4140 @ 40rc.. Everything breaks, basically the same rate. All of these get Inc plated, we are wondering of the weaker stuff broke because it was weak, and the harder stuff broke because of hydrogen embrittlement. If that were the case, will I encounter the same problem with 4340 normalized bar, or does the normalizing part kindof protect against the embrittlement problem? Otherwise are there better material finishes for steel that do not cause this problem but would hold up well under a car?
Getting really tired of making these parts, as they are wrapped into a package price, so I am usually remaking them for freeish. :-/
Getting really tired of making these parts, as they are wrapped into a package price, so I am usually remaking them for freeish. :-/