Properties of modified 9Cr-1Mo cast steel

This report describes the development and testing of a cast version of the popular ASME P-91 ferritic stainless steel. ASME and ASTM have approved its use in pressure vessels and boilers. The allowable strength level of the cast material is slightly lower than that of P- 91 wrought steel. The report also describes shop and field welding procedures developed for the cast steel. Figs, tabs.