What is a dual phase steel flange

Dual phase steel usually used in the dual phase steel flange, dual phase steel generally refers to the austenitic stainless steel - iron element size, and two phase organization to exist independently, high content, usually think in austenite, on the base of 15% or more ferrite or 15% or greater in ferrite austenite, can be called austenitic, ferritic duplex stainless steel. Dual phase steel flange products have been applied in petroleum chemical industry, oil refining, shipbuilding, onshore and offshore oil and gas, pulp and paper, chemical fertilizers, machinery and equipment manufacturing industries and in heat exchangers and other products.

The strength of the dual phase steel flange, especially the yield strength increased significantly, and lower linear expansion coefficient and the welding hot cracking tendency, and at the same time greatly improve the intergranular corrosion resistance, resistance to chloride stress corrosion and corrosion fatigue performance. Improve the chromium and molybdenum content, but also improve the pitting, but if the ferrite content more, is kept high chromium iron ferrite stainless steel of various brittleness tendency. In general, thermoplastic duplex stainless steel is lower than that of single phase, it is the distribution of the two-phase nature, scale, size, shape, but also related to such factors as the heat treatment.

The corrosion resistance of dual phase steel flange, mainly depends on the passivation element content and its distribution in two phase. In general, the corrosion resistance of duplex stainless steel, general with chromium. Molybdenum is fairly high chromium iron grain size or chromium nickel austenite stainless steel, and the phase, the proportion of the intergranular corrosion resistance is superior to the single phase stainless steel of the organization.

Through the above introduction, we should be of dual phase steel flange have a certain understanding.