Technical conditions of 9Ni590A steel plate

Technical conditions of 9Ni590A steel plate:
(1) The scope of chemical composition standard of 9Ni590A steel shall be strict, such as Si mass fraction of 0.15% - 0.30% and Ni mass fraction of 8.50% - 9.50%.

(2) Generally speaking, the maximum value of P and S allowed by the standard is about 10 times that of 9Ni590A steel plate, that is, when 9Ni steel is used for the design condition of - 196℃, the content of P and S must be greatly reduced; For the equipment manufacturing of 9Ni steel, the content of P and S shall be reduced as much as possible to ensure that the equipment of 9% Ni steel can meet the service requirements when the design temperature is - 196℃.

(3) The key alloy components artificially added and controlled in the chemical composition design of 9Ni590A steel are Ni and Mn, which tend to get a larger value under the condition of the control method.