FRACTURE-TOUGHNESS OF 15X2HMFA STEEL AND ITS WELDS

The generalized experimental fracture toughness results of industrial semi-products, made from Cr-Ni-Mo-V steel and intended for VVER-1000 r eactor pressure vessel manufacture, are presented. On the base of test results of nine steel heats having a common purity (sulfur to 0.018%; phosphorus to 0.015%; and copper to 0.20%) and of the same number of heats having a higher purity (sulfur to 0.012%; phosphorus to 0.012%; and copper to 0.06%) the fracture toughness temperature dependences we re constructed. These differ appreciably from the reference curves for this material according to PNAE G-7-002-86 The temperature dependence s K-lc for 15X2HMFA steel welds were also obtained. By this, for welds produced using manual are welding and the types RT-45A and RT-45B ele ctrodes as well as electroslag welding with Sv-16X2HMFTA wire and OF-6 flux, these dependences were constructed on the limited number of wel ded samples, as these welding methods are, practically, not used in th e manufacture of such reactors. The fracture toughness assessment for welds produced by submerged are welding was carried out for two varian ts of production processing (Sv-10XGNMAA wire and AH-17M flux; Sv-08XG HMTA wire and NF-18M flux), which were applied in the fabrication of c ircumferential welds for a VVER-1000 reactor. (C) 1998 Published by El sevier Science Limited. All rights reserved.