Weld Mold 9210T description: Weld Mold 9210-T bare rod is used to repair all A.I.S.I. P-20 tool steel. They can also be used to overlay working areas of lower alloy steels in order to obtain more wear-resistant surfaces. Weld Mold 9210-T can also be used to repair higher alloy tool steels like H-11, H-12, and H-13, when machinability is a primary concern. Weld deposits of Weld Mold P-20 can be heat treated and tempered to desired hardness, plus they can be Carburized or Nitrided to higher hardness levels of 57-58 RC. The weld deposits will polish to a very high luster.