Moly in 300 Series Stainless
Moly in 300 Series Stainless
(OP)
I am curious to know, what affect does molybdenum content have on 300 series stainless when producing autogenous welds? Also, how does the sulfur content and moly content relate to each other and weldability?
Thanks in advance!
Thanks in advance!





RE: Moly in 300 Series Stainless
The effect of Mo on the weldability of austenitic stainless steels can be observed by the Cr eq equation, where Mo behaves even stronger than chromium in ferrite formation during solidification. This is important to avoid hot cracking in austenitic stainless steel welds.
The effect of sulfur content is critical because increased sulfur content promotes improved wetting of the weld puddle (weld bead shape). However, hot cracking susceptibility is increased.
So, from my perspective, increased Mo content promotes ferrite formation to reduce hot cracking while sulfur increases wetting. I have not seen a specific interaction where Mo is deliberately added to allow increased sulfur content to promote wetting.
RE: Moly in 300 Series Stainless
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Plymouth Tube
RE: Moly in 300 Series Stainless
The presence of sulphur may cause cracks in the weld or HAZ, so it's important to clean the material to avoid Sulphur contamination and control the amount of ferrite in the weld.
here you can find software to calculate the ferrite in a weld:
http://w
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Corrosion Prevention & Corrosion Control