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Another steel specification question! SS400...? steel plate

Is ss400 a mild carbon steel or stainless steel? I thought all "ss" steels were stainless steel!

Is JIS ss400 and ss400 (on its own) the same thing or are they different?

Thank you guys again!

in JIS (Japanese) "SS" stands for structural steel, and 400 grade
which is similar to AISI 1018.
.
in JIS stainless steel is "SUS"

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