How can we use slide plates effectively for steam lines?

You would need to use the insulation type slideplate, ie: marinite, to insulate from the heat with PTFE on top of the structureto absorb the impact load if you have any steam hammers.

Slide Plate Assemblies With 2 3/4' Marinite Blocks
Slide Plate Assemblies with 2 3/4″ Marinite Blocks