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Choice of SS material
2

thread723-123380

Choice of SS material

Choice of SS material

(OP)
Hello to all,

At a temperature of 600°C (1112°F), which material is the better for use? SS304 or SS321.

RE: Choice of SS material

304.

RE: Choice of SS material

It all depends on the application.
IF a little sensitisation wouldn't hurt then 304L should be fine.  But if corosion (pitting or CSCC) are concerns remember that they are both accelerated by sensitization.  In that case the 321 would have some advantages.

= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm

RE: Choice of SS material

In comparison to 304L the higher carbon in 321 also provides better high temperature strength if that is an issue. My minimum creep data shows that at 1100F the Average stress for 0.0001%/hr creep rate of 304L is 7,700 psi vs. 20,000 for 321.  

RE: Choice of SS material

can u suggest me which is the right substitute for EN8 alloy

c.k

RE: Choice of SS material

EN8  alloy that I know is a medium carbon(approx 0.38-0.45%) steel.What do you want to substitute for?

RE: Choice of SS material

Let me put it this way:

- if sensitization is not an issue, SS304 would be just fine. However, either use 304H or 304 with minimum carbon content of 0.04%.

- If sensitization is indeed an issue (which means that you require high corrosion resistance as well), go for SS321.

RE: Choice of SS material

This is a screwed up thread. One imprecise question has resulted in no clear course and the poser of the question hasn't bothered to clarify. Please, no on respond further unless DVNMech can give the appropriate details.

Michael McGuire
http://stainlesssteelforengineers.blogspot.com/

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