These included quartz, which is readily available. Not all steels work. Stainless, for instance, will likely not work as a striker. High carbon steels, tool steels and knife steels such as 1095 will work when hardened by heat. If you find a piece of steel you can test it as a striker to see what sparks it generates.
Unknown steels require testing.
You may need to experiment with your steel to determine how well it works. Some steels may be suitable, but might be annealed, or soft. Take care when trying this, as the oil can ignite. Old files and some large springs can provide good sources for strikers. The tinder needs to be capable of ignition when catching a low temperature spark.