THERMAL TREATMENT METHOD OF SEMI-FINISHED PRODUCTS FROM HYPOPEARLITIC STEELS

摘要

FIELD: metallurgy industry. ^ SUBSTANCE: invention refers to thermal treatment procedure of forges intended for manufacturing parts and assemblies operating at low temperatures, for example containers for transporting and long-term storage (more than 50 years) of spent nuclear fuel. The result is achieved due to the fact that semi-finished product is subject to hardening from temperature which is above critical point Ac3, high-temperature tempering within temperature range of 620-670C with cooling in the air and to additional tempering within temperature range of 400-450C with exposure time of 3-3.5 hours with subsequent cooling in the air. ^ EFFECT: increasing cold resistance of low-carbon steels. ^ 1 ex, 2 tbl