When cutting steel pipes, you need to prepare the following tools:

1. Steel pipe cutting machine: Choose a cutting machine suitable for the diameter and thickness of the steel pipe. Common steel pipe-cutting machines include handheld electric cutting machines and desktop cutting machines.
2. Steel pipe clamp: used to fix the steel pipe to ensure that the steel pipe does not move or shake during cutting.
3. Steel pipe support frame: used to support long steel pipes and keep them stable. The support stand can be a tripod stand, a roller stand, or a height-adjustable stand.
4. Steel ruler and marking tools: Used to measure and mark the locations on steel pipes to be cut.
5. Electric welding machine: Sometimes it is necessary to use an electric welding machine to weld two steel pipes together before cutting.
6. Safety protective equipment: Cutting steel pipe is a dangerous task, so make sure you wear safety glasses, gloves, and earplugs. Also, make sure the operating area is well-ventilated to prevent the build-up of toxic gases.

Please note that these tools may vary depending on the specific cutting task and your personal needs. Before performing any cutting operations, please ensure that you fully understand and master the relevant safety operating procedures and follow the correct operating steps.