Different Stainless Steel Properties

You only listed 300 series Stainless.

If you want physical properties and characteristics, Try Machinery's Handbook.

Or Matweb

Titanium in this alloy combines with carbon preferentially to Chromium to prevent crack sensitization and loss of corrosion resistance in the 800-1000 degree F temperature range.

See Stainless_Steel_Grade_Selection by Atlas Specialty Metals.

A real good answer.

But it may be noted that in the projects of 90s, SS321 tubes were used in steam super heater coils, which were subjected to >750°C from out side and super heats the steam to 515°C inside the tubes, have now been replaced by material SS 304H, which has proven to be better in that harsh atmosphere in place of stablised 321. This is due better physical/Mechanical properties of 304H as compared to that of SS321. The specific case I am refering is Super heater coil in one of the Haldor Tosae plant's Reformer furnace.

It is better to understand the exact requirement to use the specific material of construction.

Dear Friend,

AISI 304:good for all the applications

Defieciency:It has got Carbon Sensitization.At hogh temp.

321:is astabilized steel.and with stand HIGH temp applications

Regards

G.Surareddy

bad advice, 304 will not hold up in a caustic environment. Where 316 will.

and neither will hold up in high H2S unless dead soft.

I failed to mentioned the level of environment.

The point still being, there is a reason for different grades. To specify you must first establish the condition and environment the steels will be working in.

Not intended to bust your chops Phoenix, sorry if you took it that way, just extending your quite correct point that those other alloys exist for a reason and to dismiss them all is beyond folly.

Thats ok, it only sounded like I took it hard. Fact is you were correct in pointing that out.

I need to be pressed like that every now and again. Thanks and my chops still hurts.