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(1) With both steels containing about 0・2 or 0・3% nitrogen, remarkable increase in hardness was obtained by hot-cold working at 600°C or 700°C as well as by cold working. It was concluded that such hardening was caused by an action similar to strain-aging in the deformed austenite phase supersaturated with nitrogen. (2) It was deduced from the microscopic observation of the worked steels that the deformation by the working at lower temperature occurred mainly within grains, while the deformation at higher temperature as in the hot-cold working occurred mainly on grain boundaries. (3) The lower the working temperature and the larger the reduction by working, the easier the softening occurred by heating of the worked steels. With the 16-15-6 type alloys, however, the effect of working condition on the softening due to the heating of the worked alloys was not so great as the 316L type one. (4) In general, the cold working deteriorated the bending creep properties at temperatures as high as 700°C of the two steels containing nitrogen , and the hot-cold working also did not improve their creep properties, while both of the workings improved appreciably the properties of the 16-15-6 type alloys not containing nitrogen, which showed in the solutionquenched state little resistance to the bending creep under a definite testing condition of 700°C and of 16kg-load. Under a given reduction by rolling, that is 20%, the hot-cold worked 1615-6 type alloys with or without nitrogen at 600°C or 700°C showed the larger resisting

Effect of Working on Heat-Resisting Properties of 316 L Type Steels and 16-15-6 Type Alloys