The PSI that can cut through steel is a PSI of between 20,000 PSI to 55,000 PSI.
The water pressures for water jet metal cutting ranges from 20,000 PSI to as much as 55,000 PSI.
Water can be used to cut materials like steel when the water is highly pressurized and concentrated through a tiny opening.
Waterjet cutting machines feature an intensifier pump that forces the water through a nozzle at an incredibly fast speed, producing its cutting ability.
In waterjet cutting, normal pressure refers to a water pressure of up to 60,000 psi.
Of course, this value is not 'normal' compared to the water pressure in non-cutting applications.
However, compared with a hyperpressure pump which goes from 60,000 psi to 90,000 psi, or higher – it is 'normal'.
Abrasive waterjets can cut through 12 inches of most materials.
Many users report cutting material even thicker than that.
Most abrasive waterjet cutting, however, is done in material that is 3 inches thick or less.