The tension properties, thermal expansion coefficient, microstructure and the causes of crack formation of the stainless steel layer in the composite pipe made by centrifugal-SHS process were investigated. It was shown that the tensile strength is 316 MPa and the percentage elongation is 5–8%. The nonmetal inclusions make the stainless steel pipe brittle. In the … Read more
This paper pays a special attention to the issue that there is a significant scatter of the stress-strain responses of a nuclear engineering material, 1Cr18Ni9Ti stainless steel pipe-weld metal. Statistical investigation is made to the cyclic stress amplitudes of this material. Three considerations are given. They consist of the total fit, the consistency with fatigue … Read more
Residual stresses in welded components are discussed and a brief review of weld simulation is presented. The general methodology of the FE analysis methods used for welded sections of steel pipes is explained. FE analyses are performed for two axisymmetric butt welds in stainless steel pipes having a 4-pass or a 36-pass weld in a … Read more
Type 316 CFM centrifugally cast stainless steel pipe is used for coolant piping, involving service at 288 deg C to 316 deg C. The possibility material property degradation due to thermal aging occurring on the long service life of this piping was investigated in an experimental program. Test sections were aged at 427 deg C … Read more
Welding processes induce residual stresses and distortions which can play a major role in the mechanical strength of a component. 3D modelling of multipass welding of a 316L stainless steel pipe. Numerical simulation of processes is of big help to control these effects as it provides the evolution of physical quantities such as temperature, stresses … Read more
The possibility of a pipe fracture emanating from a stress corrosion crack in the heat-affected zones of girth-welds in Type 304 stainless steel pipe was investigated. The J-resistance curve—tearing modulus parameter for the prediction of crack initiation, stable growth and fracture instability—was employed. To evaluate the analysis, a pipe fracture experiment was performed using a … Read more
A computational procedure is presented for analyzing temperature fields and residual stress states in multi-pass welds in SUS304 stainless steel pipe. Based on the ABAQUS software, uncoupled thermal–mechanical three-dimensional (3-D) and two-dimensional (2-D) finite element models are developed. The finite element models are employed to evaluate the transient temperature and the residual stress fields during … Read more
The application of the radial-flow growth chamber to the study of the initial stages of bacterial adhesion to surfaces under flowing conditions is reported. The adhesive properties of the bacterium Pseudomonas fluorescens (NCIB 9046) to stainless steel pipe (type AISI 316) were found to be highly dependent on surface shear stress and the time and … Read more
An investigation was carried out, through laboratory experiments, into the corrosion behaviour of stainless steel pipe immersed in natural and sterile sea-water to determine whether the observed ennoble ment of the free corrosion potentials in sea-immersed stainless steels can be explained as due to the settlement of living microbiological slime on the metal surface. Experiments … Read more
Sterile sections of rubber and stainless steel pipe were inserted sequentially into a milking installation and soiled with fresh raw milk over a period of 5 d. The resultant adherent microbial population was removed and the generic composition of mesophilic and psychrotrophic types was determined. In all cases Acinetobacter spp. were found to predominate (59.5–75.6%). … Read more