What’s up guys?!?!?! It’s Michael with Michael Talks Metal back for video 99!!!! 1 more to 100!!!! Let’s GO!!!!!! Our topic for today is 8620. Like all 86xx series alloys, Nickel, Chromium and Molybdenum are key to its performance. With a nominal carbon content of only point 20 %, it can be welded using proper procedure and can be heat treated to a hardness up to 30 Rc in sections 1/2 inch or less. It is often used in applications where parts are carburized to achieve a high hardness wear resistant surface while maintaining toughness in the core.
It is available in all common product forms.
8620 Chemistry
| Chemical Composition | 8620 | |
|---|---|---|
| Element | Min % | Max % |
| Carbon | .18 | .23 |
| Manganese* | .60 | .95 |
| Phosphorus* | .025 | |
| Sulfur* | .025 | |
| Silicon | .15 | .35 |
| Chromium | .40 | .60 |
| Nickel | .40 | .70 |
| Molybdenum | .15 | .25 |
| Copper | 0.35 | |
| * For AMS 6276 & AMS 6277 | ||
| Manganese | .70 | 1.00 |
| Phosphorus | .012 | |
| Sulfur | .010 |
Small variations in these chemistry requirements exist in some specifications.
Typical End Quench Hardenability (EQH):
48 Rc maximum @ 1/16″
32 Rc minimum @ 3/16″
Typical Heat Treatment Temperatures:
Normalize 1650 – 1750 deg F
Austenitize 1700 deg F
We have a few specs today so here goes with the more common specifications for 8620……
| Specification | Product Form | Quality | Melt | Condition |
|---|---|---|---|---|
| AMS 6274 | Bars, Forgings, Tubing | 2301 | VD | See Spec- Various |
| AMS 6276 | Bars Forgings, Tubing | 2300 | CEVM | See Spec- Various |
| AMS 6277 | Bars, Forgings, Tubing | 2300 | CEM | See Spec- Various |
As always, details in specifications and part requirements can alter what we have shown you here today. This is time 99, I can’t possibly forget to tell YOU toooooo – Check the Specs… Twice. This is Michael with Michael Talks Metal, thanks for tuning in, Michlin Metals is a distributor and supplier of 8620 alloy steel. For more info visit our website www.michlinmetals.com, if you’re still here and haven’t subscribed please consider doing so now, missed last weeks video? Click here. Thanks for watching, this is Michael with Michael Talks Metal, I will see you next Thursday, 10am, for video 100! Let’s go! I’m OUT!
