Austenitic Stainless Steel 347H belongs to high-carbon Cr-Ni austenitic stainless steel containing niobium, due to the stabilizing element Nb, its stability is very strong, good resistance to intergranular corrosion and resistance to acid stress corrosion, with good weldability, high-temperature strength and plasticity, is widely used in the boiler, power generation, petroleum, chemical industry, synthetic fibers, food, paper, and other industrial fields, is the photo-thermal power plant molten salt tanks made of important materials.
The stainless steel plates used for molten salt tank generally need to meet the following conditions:
High temperature performance: high temperature (593 ℃)
Mechanical properties: Rp0.2 ≡ 137MPa, Rm ≡ 280Mpa.
Grain size and precipitation phase: grain control in the range of 4-7 levels.
Corrosion resistance: the rate of molten salt corrosion resistance reaches the leading level abroad.
Welding performance: welded steel plate in accordance with ASME SA-213 standard Rm ≡ 515MPa, no sensitization of the welded joints.
