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Mild steel (grade A36) has a minimum yield of 36,000 psi. A572 grade 50 has a minimum yield of 50,000 psi.
Modulus is given in pounds per square inch (psi). For steel it is 30,000,000 psi
it is 30,000 Ksi or 3 x 10 E6 psi or 207000MPa
(30)(10)^6 psi
The fittings THREADED are normally rated for 125 PSI but there are ratings over 3,000 PSI if needed such as high pressure steam applications Then one has to take temperature /pressure relationship into consideration higher temperature greater pressure