Executive 309/309L provides superior weldability, low spatter and smooth beads with easy slag removal. The 0.04 percent maximum carbon content of these weld deposits ensures a higher ferrite content than the E309H, usually greater than 8 FN and reduces the possibility of intergranular carbide precipitation. This thereby increases the resistance to intergranular corrosion without the use of Nb (Cb). Executive 309L deposits are not as strong at elevated temperature as the niobium-stabilized alloy or Executive 309H deposits. If postweld heat treatment of the carbon steel is essential, the total procedure, welding and heat treatment should be proven prior to implementation.  Embrittlement or cracking can occur if dissimilar steel welds are subjected to a post weld heat treatment or to service above 700°F (370°C).