Which hand tool is best to cut a slot in a steel pipe, outside?

Route a slot in the length of PVC pipe slot pipe Make a v block out of two two by fours drill a hole for the router bit, mount the router so the bit rises high enough to make the slot Push slot planetwin365 Clamping the pipe between two 2x4's and running a circular saw down it was my first idea but the plastic shattered too much for my liking

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