how about spent propane tank for steel?
Haven't tried that but I suspect it may work. I have seen rust on propane tanks and it does seem as though things that rust tend to make decent strikers. From what I can tell the rust itself does not yield sparks but the metal under it does.
This summer my experimentation with putty knives and shovels yielded some nice results. Some of the putty knives worked pretty well. Most of the shovels I tried yielded excellent sparks. Quite jazzed about shovels now.
While I can get sparks from some stainless steels with flint the rock, have not yet been successful at creating an ember with those sparks. Few, weak and very short lived. Still, with proper striking technique I think it can be done. Since SS typically has just as much carbon as "high carbon" steel, I am thinking that high carbon vs SS is somewhat of a misnomer. A useful distinction, to be sure, merely using misleading terms.
Not the first such, think of lighter "flints" (mischmetal) and flint the hundreds of types of naturally occurring rocks to us F&S aficionados. Then again, to a geologist flint is only quartzite rocks found in chalk or marl, which excludes most of the rocks we loosely call "flint".
Here is an excerpt of a post I made elsewhere in response to a fellow who stated that F&S was not a viable option in long term survival, SHTF, etc scenarios. Certainly for the unskilled he would be correct. Turns out he was unaware that F&S was the dominant form of ignition for many cultures for 3,000 years. I also added the assertion that F&S is THE most sustainable, easy and reliable method in extended scenarios.
Of course Friction Fire is just as sustainable, however in my experience it is much less reliable and takes significantly more effort. Then again, I have not spent nearly as much time with FF as F&S... mainly because I find it more difficult and finicky! Solar Fire aka Concentrated Sunlight is just as sustainable, however it is of course dependent on having enough sunlight.
" There are dozens of steel implements that will throw sparks with flint (the rock) such as saw blades, shovels, knives, axes, files, fish hooks, Olfa blades (razor knives with breakable blades), utility knife blades, carpet knives, chisels, putty knives, etc. Not every item of each type will work or work well. Most hacksaw blades are better strikers than most purposely made strikers, knives, files, etc though some hacksaw blades will not work at all. Some iron pyrites, most notably marcasite, will throw good enough sparks with flint (the rock) to create an ember. While most stainless steels will throw some sparks with flint (the rock), the sparks are so few and weak as to be worthless for creating embers. Steels from 1055-1095, O1, O2, A2, W1, W2, L6, etc will throw sparks with flint (the rock) very well if they are hardened to 57-63 HRC (Rockwell Hardness C scale). "
Hope y'all find the list of items that can be used as a striker without modification useful. Of course any of them could be modified and re-tempered if desired.
What other strikers have y'all found? What have you found that doesn't work?