The schedules of the fittings range from 5s to XXS.Fittings over NPS12, produced by locally heating a portion of the fitting stock to any temperature for forming, shall be annealed, normalized, or normalized and tempered. And these fittings inlcudes elbow, tee, reducers, the carbon content shall les than 0.26%. NPS12 under no need to be heat treated under this forming process.