says that Trim 12 is fully 316 + HF on seat. It doesn't say anything about service conditions, so you'll have to advise pressure/temperature conditions in order to get a reliable answer.
Steam is not always as clean and dry as presumed. Cost saved on quality, both on materials and tyoe/brand and valve geometrical form can easily give a very much higher lifetime cost with shorter standtime, repairs, downtime and replacements.
For your temperature and pressure I would rather go up in quality, refer steamdog's posting.