The steel of the blade of the Axminster Rider cabinet scraper appears to be the same as in that brand’s bench planes; i.e. HRC-63.
The blade of my Rider #4 gets a lot of sharpening, as I use it for planing plywood edges. The blade sharpens easily on diamond stones, wet stones, and a Tormek. Sadly it’s quite prone to fracture.
Why not take Larry’s advice and give the scraper blade a go?