Full Transcript:
What’s up guys? It’s Michael with Michael Talks Metal back for what else? You guessed it. MORE METAL!!!!! Today it’s one hundred and two …Our topic for today is Nitriding 135 Modified aka 135M or Nitriding #3. Like most alloys designed specifically for nitriding, this alloy contains a healthy addition of aluminum. Chromium and Molybdenum are also components. With a nominal carbon content of point 40 %, it is heat treatable to high strength and hardness limited by the nitriding process temperature. More about that in our next video. It is used in applications where parts are nitrided to achieve a highly wear resistant surface while maintaining strength and toughness in the core. It is often used in gear components.
It is available in all common product forms.
Chemical Composition for Nitriding 135M.
| Chemical Composition | 135M | |
|---|---|---|
| Element | Min % | Max % |
| Carbon | 0.38 | 0.43 |
| Manganese | 0.5 | 0.8 |
| Phosphorus* | 0.025 | |
| Sulfur* | 0.025 | |
| Silicon | 0.15 | 0.35 |
| Chromium | 1.4 | 1.8 |
| Nickel | 0.25 | |
| Molybdenum | 0.3 | 0.4 |
| Copper | 0.35 | |
| *For AMS 6471 | ||
| Phosphorus | 0.015 | |
| Sulfur | 0.015 |
Small variations in these chemistry requirements exist in some specifications.
Typical End Quench Hardenability (EQH):
50 Rc Minimum @ 8/16
45 Rc Minimum @ 12/16
or in some more restrictive specs…..
50 Rc Minimum @ 12/16
46 Rc Minimum @ 16/16
Typical Heat Treatment Temperatures:
Normalize 1800 deg F
Austenitize 1700 deg F
Temper – minimum is the nitriding temperature
AMS 6472 is in a common heat treated condition, ready for nitriding after machining parts:
90,000 psi min yield
112,000 psi min tensile
16% min elongation
50% R of A
We have just a few specs today so here goes with the more common specifications for Nitriding 135M……
| Specification | Product Form | Quality | Melt | Condition |
|---|---|---|---|---|
| AMS 6470 | Bars, Forgings, Tubing | 2301 | VD | See Spec- Various |
| AMS 6472 | Bars Forgings | 2301 | VD | Heatt Treated |
| AMS 6471 | Bars, Forgings, Tubing | 2300 | CEVM | See Spec- Various |
| MIL-S-6709 | Superceded by AMS 6470 & 6472 | 2301 | VD | Various |
As always, details in specifications and part requirements can alter what we have shown you here today. So for time 102 I won’t forget to tell you to…. Check the Specs… Twice. This is Michael with Michael Talks Metal. Michlin Metals is a distributor and supplier of Nitriding 135 Modified (or 135M), check the website for more info www.michlinmetals.com. If you are still here, thank you but if you haven’t suscribed, click here (please) and if you missed last weeks’ video, click here. Thanks for watching, this is Michael with Michael Talks Metal, I will see you next Thursday, 10am. I’m out!
