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 Composition135M
ElementMin %Max %
*For AMS 6471

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……

SpecificationProduct FormQualityMeltCondition
AMS 6470Bars, Forgings, Tubing2301VDSee Spec- Various
AMS 6472Bars Forgings2301VDHeatt Treated
AMS 6471Bars, Forgings, Tubing2300CEVMSee Spec- Various
MIL-S-6709Superceded by AMS 6470 & 64722301VDVarious

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!