API RP 934-E pdf download Recommended Practice for Materials and Fabrication of 1 1 / 4 CR- 1 / 2 Mo Steel Pressure Vessels for Service Above 825 °F (440 °C) NOTE The J-factor is not applicable to these alloys, and an X-bar limit has been adopted as a means of resticting theconcentration of elements that contribute to reheat cracking...