This specification covers a corrosion and heat resistant steel in the form of welding wire. This wire has been used typically as filler metal for gas-tungsten-arc or gas-metal-arc welding of critical weldments of precipitation-hardenable, corrosion and heat resistant steels of similar composition where the weld area is required to have strength and corrosion resistance comparable to those of the parent metal, but usage is not limited to such applications.