I made fire steels for years. I did period work from the Romans and what is believed to be from the Vikings. Both of which were mere wrought iron . There forges add carbon into the iron is why it would throw sparks.
5160 will throw sparks just fine and 80crv2 , which I am told is 5160 on roids, has thrown the best sparks I have found. You can hear the sparks sizzle and his as the hit the floor and bounce they are so large.
The thing you may be missing is that you need to make sure your not overheating the steel and growing the grain and quench in a fast oil. From there make certain you grind away all the decarberized steel from the forging process. If you don't it won't spark.
Here are a few I forged from some pattern welded steel I made. The first is a san-mai with 1080 in the center. Guests can not see images in the messages. Please register in the forum.
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