Form This specification covers a corrosion and heat-resistant steel in the form of welding wire. Application This wire has been used typically as bare wire filler metal for gas-tungsten-arc or gas-metal-arc welding of corrosion and heat-resistant steels and alloys@ but usage is not limited to such applications. The relatively high ferrite content promotes weldability by combating microfissuring and minimizing cracking in heavy sections but limits use of the wire to applications not operating in the sigma-forming temperature range.