The dehydration of a paper mass in an initial zone of forming of grid desktop of the paper machine is accompanied by origin of impulses of pressure and vacuum - impulse for want of interaction dewatering of elements w...The dehydration of a paper mass in an initial zone of forming of grid desktop of the paper machine is accompanied by origin of impulses of pressure and vacuum - impulse for want of interaction dewatering of elements with a grid presenting to vertical displacements a grids and origin in a stream of pressure oscillations, dispersing a paper mass.展开更多
The threshold stress, ac, for sulfide stress corrosion cracking (SCC) of seven pipeline steels and five other Steels, the critical stress, Sc, for seven pipeline steels and two drill rod steels with various strengths ...The threshold stress, ac, for sulfide stress corrosion cracking (SCC) of seven pipeline steels and five other Steels, the critical stress, Sc, for seven pipeline steels and two drill rod steels with various strengths and the susceptibility to SCC, IRA orσf(SCC)/σf, for four pipeline steels, two drill rod steels and five other steels were measured. The results showed that there are no definite relationships among σC, SC and IRA orσf(SCC)/σf. The threshold stress for hydrogen induced cracking (HIC) during charging with loading in the H2SO4 solution, σc(H), decreased linearly with logarithm of the concentration of diffusible hydrogen co, i.e., σc(H)=A-B Inco for four pipeline steels. σc(H) obtained with a special cathodic current ic, which was corresponding to the diffusible hydrogen concentration during immersing in the H2S solution, were consiStent with ac for sulfide SCC for four pipeline Steels. Therefore, σC for sulfide SCC can be measured using dynamically charging in the H2SO4 solution with the special cathodic current iC.展开更多
文摘The dehydration of a paper mass in an initial zone of forming of grid desktop of the paper machine is accompanied by origin of impulses of pressure and vacuum - impulse for want of interaction dewatering of elements with a grid presenting to vertical displacements a grids and origin in a stream of pressure oscillations, dispersing a paper mass.
基金This project was supported by the NNSFC of China! (No.19891180, 59725104, 59895150) the Corporation of iron and Steel Baosha
文摘The threshold stress, ac, for sulfide stress corrosion cracking (SCC) of seven pipeline steels and five other Steels, the critical stress, Sc, for seven pipeline steels and two drill rod steels with various strengths and the susceptibility to SCC, IRA orσf(SCC)/σf, for four pipeline steels, two drill rod steels and five other steels were measured. The results showed that there are no definite relationships among σC, SC and IRA orσf(SCC)/σf. The threshold stress for hydrogen induced cracking (HIC) during charging with loading in the H2SO4 solution, σc(H), decreased linearly with logarithm of the concentration of diffusible hydrogen co, i.e., σc(H)=A-B Inco for four pipeline steels. σc(H) obtained with a special cathodic current ic, which was corresponding to the diffusible hydrogen concentration during immersing in the H2S solution, were consiStent with ac for sulfide SCC for four pipeline Steels. Therefore, σC for sulfide SCC can be measured using dynamically charging in the H2SO4 solution with the special cathodic current iC.
