the stress corrosion cracking of ammonia and the opening in the heat of welding on the toughness of low temperature steel for resistance to rain.

摘要

the tensile strength mm2 level 400 n / - 60 degrees, and the low temperature toughness of the steel, as in the ammonia stress corrosion cracking occurs, do not use the cold plate to provide the first task, and 50kJ / cm above the opening. HAZ welding of good low temperature toughness the use of the plate to provide the second task, even in the low yield of 88%, and the low temperature of the steel plate have to provide the third issue.;the first and the problem of the invention is a steel plate, and 0.06% c content is characteristic of the second, and the problem of the invention is a plate 0.06% c content and, at the same time, Ti: 0.005 - 0.020%, n: 0.002 0.005% ~ contains the key to it. and the third, and the problem of the invention is a steel plate as the main body, ferrite, ferrite or pearlite is existing in the layer, the layer is pearlite organization is used in the low temperature of steel plate, and the average particle size of 5 ~ 15 ud398ub77cuc774ud2b8uc758 u03bc m, and the pearlite layer spacing of 30 meters below the u03bc is characteristic.