T.O. 1-1A-9 TABLE 2-18.  FUSION WELDING CHARACTERISTICS OF CORROSION RESISTING STEEL - GENERAL(CONT’D) ALLOY/DESIGN RECOMMENDED FILLER MATERIAL/SPEC HEAT TREATMENT REMARKS TYPE STRUCTURE TYPE ELECTRODE ROD PREHEAT POSTHEAT MATERIAL TREAT 305 Austenitic 308 MIL-R-5031 None re- To restore Not generally recom- Class 1, quired if corrosion mended for welding above 60° resistance and reacts similar to 304 F. to remove pre- except due to higher cipitation car- nickel compared to bide, heat chromium (18-12) it treat to 1850° - is more susceptible 2000 F), 1/2- to cracking during 1 hr per inch cooling. thick and then cool to below 800 F within 3 minutes maximum by quenching air. 310 Austenitic 310 MIL-E-6844 MIL-R-5031 None re- Post annealing Weldable by gas/or Class 3, Class 3, quired if required if electricity prefer- AMS 5075 AMS 5694 above 60 welded joint is able by metal arc or F. to be exposed inert gas arc methods. to corrosive Oxyacetylene is not environment. recommended be- See Heat Treat cause of carbon pick- Data paragraph up and resulting ad- for tempera- verse effect on cor- ture. rosion resistance. 316 Austenitic 316 MIL-R-5031 None re- Anneal after Subject to stress cor- 317 Austenitic Class 4 quired if welding.  See rosion and embrittle- AMS 5691 above 60 Remarks and ment when heated at F. General Heat 800 - 1600 F for pro- Treat Data longed period.  Low paragraph carbon type 316L is (2-74). normally used for cross sections which cannot be annealed or low temperature stress relieved.  Oxy- acetylene welding is not advisable for casting because of carbon pickup and possible impairment of corrosion resist- ance.  Metal arc pro- cess is recommended for welding, casting, using lime coated electrodes. 314 Austenitic 310 MIL-E-6844 MIL-R-5031 None re- Anneal for Can be welded by gas Class 3, Class 3, quired if maximum or arc methods. AMS 5695 AMS 5694 above 60° corrosion re- Material should be F. sistance.  See annealed after weld- Heat Treat ing to improve cor- Data paragraph.    rosion resistance. 2-95