Calculation of Erosion in terms of energy per square area per minute per hydraulic horsepower.
One of the major UHP pump manufacturers has studied this erosion and energy concentration at length as they sell both cleaning and cutting equipment.
A typical surface cleaning application is 0.8 liters/minute (3 gallons per minute) at 280 MPa (40,000 psi) at a rate of 22 square meters (200 square feet) per hour. To erode MILD steel, you would need about 150 times more energy in terms of square area per minute per hydraulic horsepower. In other words, you would need to slow down to about 0.15 sq meter per hour at the same parameters in order to get erosion.
Personally, I don’t think anyone would want to slow down production rates this much!