US 12,259,313 B1
Rapid and comprehensive method for evaluating pitting resistance of stainless steel pipe welds
Lianyong Xu, Tianjin (CN); Yongdian Han, Tianjin (CN); Yongle Shi, Tianjin (CN); Lei Zhao, Tianjin (CN); and Kangda Hao, Tianjin (CN)
Assigned to Tianjin University, Tianjin (CN)
Filed by Tianjin University, Tianjin (CN)
Filed on Sep. 4, 2024, as Appl. No. 18/824,852.
Claims priority of application No. 202311785131.0 (CN), filed on Dec. 22, 2023.
Int. Cl. G01N 17/02 (2006.01); G01N 1/32 (2006.01); G01N 17/00 (2006.01)
CPC G01N 17/02 (2013.01) [G01N 1/32 (2013.01); G01N 17/006 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A rapid and comprehensive method for evaluating pitting resistance of stainless steel pipe welds, comprising as follows:
S1 collecting a plurality of weld samples from different positions of one or more welds on a stainless steel pipe, wherein sampling points of the plurality of weld samples at least cover a root to an upper part of any one of the welds, and obtaining a quantity of oxide inclusions per unit area in each of the weld samples, that is, a surface oxide inclusion density;
S2 obtaining a critical pitting temperature of each of the weld samples through a critical pitting temperature test;
S3 taking the surface oxidation inclusion density of each of the weld samples as an independent variable and taking the critical pitting temperature of each of the weld samples as a dependent variable, and obtaining a fitting function formula between the surface oxidation inclusion density and the critical pitting temperature as follows:
y=f(x)
wherein y is the critical pitting temperature, x is the surface oxide inclusion density, and f is a fitting function;
S4 collecting a weld sample to be tested from a stainless steel pipe to be tested, wherein a welding process of the weld sample to be tested is same as the weld sample, and obtaining a quantity of oxide inclusions per unit area in the weld sample to be tested, that is, the surface oxide inclusion density;
S5 substituting the surface oxide inclusion density of the weld sample to be tested into the fitting function formula to obtain a standard critical pitting temperature of the weld sample to be tested, and evaluating the pitting resistance of the weld of the stainless steel pipe to be tested.