Hello Zimbyzim
I once fabricated a razor from hand file (without annealing , and re-heatreated) but leaving steel hard throughout the process. And I have to say it was ridiculously hard, being that a hand file steel is extremely hard and difficult to work without putting any heat to it to change its temper. I was lucky to have a machine shop at my disposal that had coolant spray and even that was tough to keep cool.
Here are a few links of the project.
http://straightrazorpalace.com/works...bilizer-2.html
http://straightrazorpalace.com/custo...ile-razor.html
Another thing about doing this without annealing and reheattreating is that being that the steel of a file is extremely hard with a Rockwell hardness well into the 62+ range. The edge of my razor was really brittle and that making and keeping an edge was a real nightmare.
Once again keep the sucker cool throughout your grinding. If you see discoloration, you altered the temper.
Good luck :gl: