At this stage, the main materials for manufacturing nozzles in my country are: diamond, gemstones, ceramics, cemented carbide, high-grade stainless steel and high-quality carbon steel. The pre-mixed type generally uses jewel nozzles.
         Water cutting. How wide is the nozzle of the water jet? Are there any linear ones besides round ones? Is the outlet pressure adjustable?
         Water cutting. General sand pipe. It's the nozzle you said. The general diameter is 1 mm. Taking into account the characteristics of the water itself. There is no linear nozzle. The outlet pressure is adjustable. Generally under the par. There are also ultra-high pressures around.
         Ultra-high-pressure water cutting is also called "water jet", which is to spray a "high-speed" water arrow through a very fine nozzle after ordinary water is pressurized in multiple stages.