Maui,
The samples are roughly a 1/2" thick.
I was measuring what looked like case depth by using the linear measurement tool on our metallograph software. Basically I can see some austenite looking grains along the entire edge of all of my samples. But it's literally only one or two grains...
EdStainless,
It comes from requirements that are written into a new industry specification that we are manufacturing to. The API specification requires the product manufacturer (us) to perform a grain size analysis on every heat treatment lot of bolting we manufacture. So it's really just a...
My company has begun attempting to perform prior austenitic grain size evaluations. I am attempting to use the Mcquaid-Ehn process but am having difficulty getting the PAGs to show upon etching. I'm typically working with very low P+S 4140 or 4340 that has been quench and tempered to produce a...
If this is for an oilfield application, a 31 ft*lb average with a single specimen breaking at a minimum of 21 ft*lbs tends to be the norm. This is for charpy specimens taken from the longitudinal direction.
I am only throwing this out there because it is what I generally see in specifications...
Checking the hardness along the body was actually the first thing we did. We didn't see any variance outside of what you would expect to find.
These parts get sandblasted prior to coating. Is that not enough to remove any sort of etching defect that we would see on the surface?
Basically, we have some fully machined bolting inserts (7+'' O.D.)that are made from 4340 and were normalized, quenched and tempered, prior to machining. We sent these inserts out to get phosphated.
When the inserts were returned, there were light gray bands along the body, of varying diameter...
I need to make a decision for a material to be used as a stand to hold studs and bolts while they are being roll threaded. The material would need to be at <28 HRC and reasonably wear resistant. The bolts and studs will be continually rolling over the surface which is where the need for wear...
-75 F is the actual testing temperature. I'm not sure where I pulled -150 from (too much L7 bolting).
The melting practice could be either AOD or VOD followed by VAR or ESR.
We will be forging the heads and machining the underhead fillet. The threads will be rolled after the forged blanks...
Heat Treatment:
Solution Anneal @ 1870-1925 F for 2 hours
Multiple Choices for Ageing Procedure
1)1400F +/- 15F for 10 hours, then furnace cool @ 100F/hr to 1200F +/- 15F for 18 hours
2)1400-1450F +/-15f for 6-8 hours followed by an optional secondary precipitation hardening treatment...
I am looking to improve the wear life of some forging dies used at my manufacturing plant. The dies are made of H13 tool steel. I have very little experience with case hardening via chemical absorption and I just wanted to know if anyone had any tips on what I should take into consideration when...
