gee its been a few years but from memory
*304 std stainless steel
*316 marine grade s/s
409 and 403 is magnetic s/s
* are easier to weld, beld and anneal for bending and are not magnetic
409/430 weakens when you weld it because is has less carbon but i think it has a 'chrome' finish and does not come in 'satin'
may is ask what application you want to know?
If only i didnt throw out my old tafe workbooks i could tell you exactly
Thanks tibbo, I have seen differant exhaust systems with these 2 differant gradings and wondered what they were. Doesn't say much for my 2 year welding course I did in the late 70s. I should say doen't say much for my memory.
409 was apparently developed for exhaust systems as a cheaper alternative to 304. It normally only comes in a satin finish.
304 is your cheapest of the quality stainless steels (316, 321). These have a lot more corrosion resistance. If you look for Algenhy Lunghy in the USA or something like that they will have material data sheets, they invented 409 I believe.
When you look at Jap stainless steel turbo exhaust manifolds their TIG weld joins have a golden colour to them.Does anyone know whether they use a special filler rod (say to prevent cracking) or could it be the grade of stainless they use that gives the joins this golden colour. My stainless tig welds never have this colour.
I use argon. Will try and use a higher quality filler wire.
Any idea where to get mandrel stainless bends for manifold manufacture direct from the bender. The place I get them from are a rip off but I cant find out who supplies them.