Alloying of high manganese stainless steel with sulphur
Alloying of high manganese stainless steel with sulphur
(OP)
Dear all
Have you some experiences with alloying of hign manganese stainless steel (about 10% Mn) with sulphur (to 0,2 %S after solidification)? There is very strong reaction of manganese and sulphur which creates slaggy MnS layer and reduce content of both the elements. Exist some known method how to slightly avoid this reaction - make it not so strong?
Thank you!
Have you some experiences with alloying of hign manganese stainless steel (about 10% Mn) with sulphur (to 0,2 %S after solidification)? There is very strong reaction of manganese and sulphur which creates slaggy MnS layer and reduce content of both the elements. Exist some known method how to slightly avoid this reaction - make it not so strong?
Thank you!





RE: Alloying of high manganese stainless steel with sulphur
RE: Alloying of high manganese stainless steel with sulphur
RE: Alloying of high manganese stainless steel with sulphur
You will have very little toughness left.
And pitting initiation at the inclusions that are open to the surface will be very rapid, you will probably get rust staining.
If you keep the pouring temp minimized, aggressively stir the S in right before the pour, and get rapid solidification the damage will be minimized.
Honestly anything over 0.05% S will cause such massive MnS in the structure that They will not help.
How much worse does this machine than any other stainless?
You use either carbide or ceramic tooling, take very deep cuts, with as much feed as your power will allow.
Don't make a second machining pass unless it is also a very deep cut. The surface will work harden greatly.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Alloying of high manganese stainless steel with sulphur
The affinity of S to Mn is very high thermodynamically . I think your 10%Mn is the problem in slag formation.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Alloying of high manganese stainless steel with sulphur
.2%S SS (magnetic grades for solenoid quality) is not uncommon either, but Mn is normally <1%.
P is another element added intentionly for improved machinbility.
Adding Al, V at melting may be able to help to keep both Mn and S higher.
RE: Alloying of high manganese stainless steel with sulphur
adding S at pouring, not at melting
RE: Alloying of high manganese stainless steel with sulphur
Wew will try Al. Vanadium is in the standard about 0,7
RE: Alloying of high manganese stainless steel with sulphur
RE: Alloying of high manganese stainless steel with sulphur
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)
RE: Alloying of high manganese stainless steel with sulphur
In past we reached level min. 0,15% on poured tubes, but it was in about 20-30% cases and it totally destroyed our productivity. (multiple alloying and re-alloying with FeMn / FeS)
I am trying to find metallurgic way to reach satisfactory level with satisfactory productivity, but it looks like we have to request the deviation to sulphur content. We have proved that machinability of tube wit 0,5 % S and 0,12 % S is totally the same... the same bad.
We are going to try to lead the melt as a low manganese and to alloy the FeMn at the very end of melting process. We have another heat resistant steels with very high sulphur level and Mn up-to 2%, so, of course, there is no problem like that.
RE: Alloying of high manganese stainless steel with sulphur
1. We found the way how to reduce the sulphur content... = of course, I thought to get the sulphur content as high as possible
2. 0,5 % S and 0,12 % S = 0,05 % S and 0,12 % S
I will appreciate every opinion or experience from you!
Thank you guys once more!
RE: Alloying of high manganese stainless steel with sulphur
The sulfides must be thin and evenly dispersed. Large thick sulfides will be just as bad (or worse) than none since you will have abrupt changes in loading on the tooling.
Tell you machine shop to fix their tooling.
You do know that these alloys will have very poor fatigue strength and terrible corrosion resistance.
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
RE: Alloying of high manganese stainless steel with sulphur
For understanding, our customer developed steel like these. It is for parts used as stators. Only they know why steel like this is used. We only have to make steel according to customers standard. This is our problem.
RE: Alloying of high manganese stainless steel with sulphur
a higher tapping temperature could also be helpful
RE: Alloying of high manganese stainless steel with sulphur
We are limited because we are using atmospheric induction melting furnaces. I do not know if Ca and other deoxidizers can be helpful in this case. What is your opinion?
What about temperatures, our melt has 1560 deg. Celsius before pouring to the tranfer ladle. Lower temperature used results to cold joints and a lot of melt stays in ladle, higher temperature means very low viscosity (a lot of manganese in melt)...
RE: Alloying of high manganese stainless steel with sulphur
For critical applications, vacuum induction melting is preferred.
I'm just one step away from being rich, all I need now is money.
( read somewhere on the internet)