API RP 934-C pdf download Materials and Fabrication of 1 1 / 4 Cr- 1 / 2 Mo Steel Heavy Wall Pressure Vessels for High-pressure Hydrogen Service Operating at or Below 825 °F (440 °C) Specimens shall be oriented transverse to the rolling direction in accordance with SA-20. Distance from plateedges shall be 1T minimum. lf a hot tensile test...