Abstract
The temperature ranges corresponding to phase transitions in the heating and cooling of L80 steel of 13Cr type according to the API 5CT/ISO 11961 standard are determined (the Russian analog is 20X13 steel). The influence of the heat treatment on the structure and mechanical properties of the steel is investigated. It proves expedient to reduce the initial temperature in quenching from 1030–1040°C to 930–960°C, so as to improve the impact strength of the steel at negative temperatures. The influence of additional alloying of L80-13Cr steel with manganese and molybdenum on its strength and plasticity is studied. The use of steel with 13% Cr and with 1–2% nickel and manganese is promising for low-temperature pipe resistant to carbondioxide corrosion.
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