Avesta 318-SI/SKNB-SI description: AVESTA 318-Si/SKNb-Si is used for welding titanium and niobium stabilised steels of type 17 Cr 11 Ni 2.5 Ti or similar, providing improved high temperature properties, e.g. creep resistance, compared to low-carbon non-stabilised materials. 318-Si/SKNb-Si shows better properties than 316L-Si/SKR-Si at elevated temperatures and is therefore recommended for applications where service temperatures exceed 400°C.