Avesta FCW 347/MVNB-PW description: AVESTA FCW 347/MVNb-PW is used for welding titanium and niobium stabilised steel of type 19 Cr 10 Ni or similar. A stabilised weldment possesses improved high temperature properties, e.g. creep resistance, compared to low-carbon non-stabilised materials. 347 type FCW is therefore primarily used for applications where service temperatures exceed 400°C.