Avesta 347-Si/MVNb-Si description: AVESTA 347-Si/MVNb-Si is used for welding titanium and niobium stabilised steels of type 19 Cr 10 Ni Ti or similar, providing improved high temperature properties, e.g. creep resistance, compared to low-carbon nonstabilised materials. 347-Si/MVNb-Si is therefore primarily used for applications where service temperatures exceed 400°C.