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304LP vs 304L 4
- Thread starter mighoser
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- #4
If you go to the Outokumpu web site the 304L under Prodec 304L is where the suffix P was added. The attached is a pdf on the material. It is self explanatory...
Is Moly permitted in 304L? For A/SA 240 Mo is not intentionally added nor specified for 304.
The Prodec 304L is UNS S30403, and is in A 240.
Is Moly permitted in 304L? For A/SA 240 Mo is not intentionally added nor specified for 304.
The Prodec 304L is UNS S30403, and is in A 240.
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- #6
EdStainless
Materials
It is free machining by virtue of inclusion shape control (not S, Pb, or Se).
And as such it still meets the 304/304L UNS and specs, and has the same corrosion resistance and weldability.
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P.E. Metallurgy, Plymouth Tube
And as such it still meets the 304/304L UNS and specs, and has the same corrosion resistance and weldability.
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P.E. Metallurgy, Plymouth Tube
moltenmetal
Chemical
Wow- that sounds magical- although "free machining" is no doubt a matter of degree.
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- #8
EdStainless
Materials
2 or 3 times better than standard 304L is still pretty bad, but it is better than nothing.
One interesting bit of info, the newer lean duplex stainless alloys (2101, 2202, and so on) have very good machinability.
These alloys are much stronger than 304/316, and they have at least as good of corrosion resistance as 316.
I expect over the next 5 years to see them replace 300 alloys for all applications above -40C and below 600F unless very high elongations are required.
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P.E. Metallurgy, Plymouth Tube
One interesting bit of info, the newer lean duplex stainless alloys (2101, 2202, and so on) have very good machinability.
These alloys are much stronger than 304/316, and they have at least as good of corrosion resistance as 316.
I expect over the next 5 years to see them replace 300 alloys for all applications above -40C and below 600F unless very high elongations are required.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
Interesting read Ed. Ive looked into this as well some years ago. I found the lean grades not be sufficiently interesting at the time being due to;-
- availability. In the EU, markets might have been different from US, but it wasn't that widespread available.
- product form. I was looking into the using this in pipe form mostly, for piping (say up to 4"), and standard fittings for building smaller (OD max 10") vessels with.
- size. Sinze we use a lot of smaller sizes, usually in combo with lower pressures, thickness savings were minimal and therefore material savings non-existent when reviewing e.g. 316 vs 2101.
You reckon these things may have changed?
- availability. In the EU, markets might have been different from US, but it wasn't that widespread available.
- product form. I was looking into the using this in pipe form mostly, for piping (say up to 4"), and standard fittings for building smaller (OD max 10") vessels with.
- size. Sinze we use a lot of smaller sizes, usually in combo with lower pressures, thickness savings were minimal and therefore material savings non-existent when reviewing e.g. 316 vs 2101.
You reckon these things may have changed?
moltenmetal
Chemical
I don't think the availability of these grades is any better here in North America XL83NL
EdStainless
Materials
Availability may not be perfect yet, but it is getting much better.
You will not be able to find all product forms in one alloy, so you will likely end up having to use two or three different lean duplex grades. I have made HX tubing in three different ones, they all work fine.
If you are building a tall tank or silo the savings are huge, but you are correct that for many applications it is still a wash. In smaller sizes you often run up against minimum thickness long before you reach the lower limit for pressure containment.
When Ni goes back to $10/lb and Mo to $25/lb the switch will be permanent.
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P.E. Metallurgy, Plymouth Tube
You will not be able to find all product forms in one alloy, so you will likely end up having to use two or three different lean duplex grades. I have made HX tubing in three different ones, they all work fine.
If you are building a tall tank or silo the savings are huge, but you are correct that for many applications it is still a wash. In smaller sizes you often run up against minimum thickness long before you reach the lower limit for pressure containment.
When Ni goes back to $10/lb and Mo to $25/lb the switch will be permanent.
= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
moltenmetal
Chemical
When Ni goes back up to $10/lb, the Chinese will "fix" the problem again by making nickel pig iron. If moly ever goes back up to $25/lb though, you're right- things'll change. Then again, we've been waiting decades to see good availability of 2205 in small piping product forms and we still aren't there yet.
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