Temper Embrittlement (?) of 410 & 410S stainless steel

[Guest102023]

Looking for the susceptibility of these steels to temper embrittlement, particularly 410S. In principle it is possible, but I've been unable to locate hard data.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[Guest102023]

(Sorry, wrong category)

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[EdStainless]

But in case you are wondering, 410S has so little carbon that it wont form marteniste even with a hard quench, it is a ferritic alloy.

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P.E. Metallurgy, Plymouth Tube

 

[Guest102023]

EdS,
I know 410S is ferritic, does that preclude the possibility of TE?

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[metengr]

Yes, see below
The alloy can not be hardened by heat treatment. It is annealed in the 1600 –
1650°F (871 – 899°C) range and then air cooled to relieve cold working
stresses. 410S should not be exposed to temperatures of 2000°F (1093°C) or
above due to embrittlement. If excessive large grains are encountered after
annealing mildly cold-worked material, the annealing temperature should be
decreased to a range of 1200 – 1350°F (649 – 732°C) range

http://www.aksteel.com/pdf/markets_products/stainless/ferritic/410S_Data_Bulletin.pdf

 

[Guest102023]

Thanks all, and not a minute too soon.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[EdStainless]

Though as a ferritic if you hold it at temps in the range of 600-1100F you will get secondary phase embrittlement (885F is the peak temp). This is much less severe in 410S than in higher Cr ferritics and is not a fatal issue usually.

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P.E. Metallurgy, Plymouth Tube

 

[Guest102023]

I considered 885°F embrittlement as well. The light gauge welded parts will be cooled fairly quickly through this range, which is also well above service temperature.

"If you don't have time to do the job right the first time, when are you going to find time to repair it?"

 

[EdStainless]

Just to add to my comment above, I don't like seeing these welded with low Ni austenitics. It is too easy to get a very bad duplex structure in the weld and even less ductility than the ferritic (which is saying something). I have seen such welds have DBTs that are above room temp.......

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P.E. Metallurgy, Plymouth Tube