Materials used in welded construction of pressure parts shall conform to one of the specifications given in section II of the ASME Code and shall be limited to those for which allowable stress values are given in section IV of the ASME Code and for which weld group P - Numbers are assigned in section IX of the ASME Code.
N.Y. Comp. Codes R. & Regs. Tit. 12 §§ 4-1.16