Do you have a spec number? I know of SUS, SUSX, SUP, SUH...but eithout a specification number you will have trouble.
The grades are only composition, properties and such are in the specs.
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Rust never sleeps
Neither should your protection
There is no such designation SUSH2 within the JIS standards system. There are many grades that start with SUS or SUH, but not SUSH2. Please confirm the exact designation and standard. An example is SUS 302 according to JIS G 4304.