I echo what David and Aaron said; this is really apples and oranges, not only with regards to corrosion resistance to particular media but also processing. For example, the way you weld and/or heat treat 300 series is different than how you weld and/or heat treat 400 series. So if you would ordinarily weld this material (I don't see a product form being specified but let's just say it's a pipe) onto a reducer that's also 300 series and solution anneal the assembly, you can't do that anymore because now you have a dissimilar metal weld on your hands and that solution annealing temperature will not be appropriate for the 400 series, nor will you necessarily be able to temper the 400 series like you should since that could sensitize the 300 series. The mechanical properties will be different too of course - for example, your strength is higher but your low temperature toughness will suffer.
If it were me, unless I were absolutely in a bind where the project schedule couldn't accommodate getting new material and I had no choice but to make the alternate material work, I'd ask the vendor to take it back and give me what I ordered.
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Sean Piper
Product / Process Metallurgist
Ellwood Texas Forge Houston
Houston TX
(713) 434-5138
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Original Message:
Sent: 11-28-2021 19:11
From: William Pinzon
Subject: Corrosion resistance of 300 series austenitic steel vs. 400 series martensitic steel
A supplier mistakenly used 400 series martensitic steel instead of 300 series austenitic.
We all know that 300 series due to its higher chrome content is a true stainless steel and more corrosion resistant than 400 series. I have found many online sources which reinforce this
What I have not found is any data showing any corrosion/salt spray testing comparing 300 to 400 series. Does anyone have any corrosion/salt spray test data comparing 300 to 400 series?
If possible please also respond to the email carpinz@hotmail.com.
Thanks for any support!
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William Pinzon
BAE Systems
Greenlawn NY
(516) 735-5413
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