1 bar is approximately equal to 1 standard atmosphere (which equals 14.7 pounds per square inch, psi). 1 psi is approx 68.95 millibars (1000 millibars = 1 bar).
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"Psi" says the formula. The pound per square inch or, more accurately, pound-force per square inch - symbol: psi or lbf/in2 or lbf/in2 - is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch. 1 pound per square inch = 6 894.75729 pascals Pascal (Pa) is the SI unit of pressure.
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
38.2kPa equates to 5.54 psi
1 square ft= 144 square inch
When you say "kg", I'm going to assume you mean the weight of one kg of mass on Earth ...2.20462 pounds.(652 pound/in2 ) x (1 kg/2.20462 pound) x (1 inch/2.54 cm)2 = 45.84 kg/cm2