Mn-alloyed steel

[gieter]

Does anyone know of a steel containing 6% Mn with a low carbon (0.12%) and small additions of Mo and V, without Cr or Ni?
I'm told it has superior fatigue resistance.

 

[EdStainless]

The alloy would be stonger and have higher strain hardening factors. But that said, the only high Mn alloys that I know of are austenitic.

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Corrosion never sleeps, but it can be managed.

http://www.trenttube.com/Trent/tech_form.htm

 

[gieter]

EdStainless,

We had the same tought. The carbon and manganese are to low to speak of Hadfield steel and there is no Cr nor Ni involved.
Is strain hardening beneficial for fatigue resistance?
What would be the effect of the high Mn on welding and casting?

From what we have heard this alloy is used in France in bridge building and is known there as X12MnMoV6.

 

[metengr]

To add to what edstainless has mentioned regarding strain hardening, I would expect that the 6% Mn steel would have improved fatigue strength. There are very general correlations between tensile strength and fatigue strength, where an increase in tensile strength results in an increase in fatigue strength. Also, with the increased ability and capacity for stain hardening, I would expect this would tend to reduce the tendency for fatigue crack initiation, which also would imply increased fatigue strength.

Regarding welding, Mn is an austenite stabilizer, and as such, I would expect this material to be welded with minimum preheat in the field. This material should be readily weldable.

 

[arunmrao]

This chemistry material is normally used in plate form. One common application is that in shot blasting machine. The chamber is fabricated with this plate material. Considerable welding and forming is done. They are better than mild steel plates for wear application.

As workhardening occurs the TS increases so also the fatigue strength should improve.