We have to weld API 5L X-65 pipe to a part that requires PWHT. I finally got the MTRs for the X-65 pipe, and it appears that the pipe is in the "as-rolled" condition. If the X-65 gets PWHT at 1125F, will that reduce the properties too much? we only have to meet the tensile properties (and bends), CVNs are not required. I cannot get ahold of the mill, as the pipe was customer supplied, and might have been made in Vietnam. Not sure on that one. If we can't PWHT the X-65, we may have to butter-PWHT then weld to X-65 without PWHT, but I'd like to avoid that if I can.
Chem of pipe is as follows: .067C, .239Si, 1.59Mn, .044Nb, .001V, .028Al, .015Cu, .018Ni, .184Cr, .002Mo, .022Ti, 66ppm N, .019P, and .003S.
Current mech properties are: 630 MPA tensile, 515 MPA yield, 38% elongation.