Effect of nitrogen and heat treatment on the structure and properties of high-temperature steel 31Kh19N9MVBTL

This paper shows that alloying steel 31Kh19N9MVBTL with 0.07-0.13 nitrogen excludes the possibility of forming 0-phase, causing embrittlement and leading to cracking, from ferrite. Short-term and long-term strength characteristics for steel alloyed with nitrogen are 10-15% higher than for steel without nitrogen at normal and operating temperatures. Ductility and impact strength for steel with nitrogen, although somewhat lower than for steel without nitrogen, all the same satisfy the specifications. Austenitizing at 1200-1220 C both for steel without nitrogen, and alloyed with nitrogen, provide higher mechanical properties than austenitizing at 1180 C