Abstract
Abstract The AISI 316L type steel belongs to the group of chromium-nickel stainless steels. They are determined according to European standards as X2CrNiMo17-12-2 and belong to the group of austenitic stainless steels. Steels of this group are used for elements working in seawater environments, for installations in the chemical, paper, and food, industries, for architectural elements, and many others. The chemical composition of corrosion-resistant austenitic steels provides them with an austenite structure that is stable in a wide temperature range, under appropriate conditions for heating, soaking, and cooling. 316L steel plate was subjected to a technological treatment of hot straightening with an oxy-acetylene torch, which is not commonly used for this type of steel, mainly due to the lack of objective assessment of whether the austenitizing temperature has been achieved and the stability of the heat treatment process is ensured. The single-phase structure of austenite with high corrosion resistance, without precipitation of carbides, steel is obtained by supersaturation in water from 1100°C. The purpose of the presented research was to determine the usefulness of the flame straightening process for a ship structure made of 316L steel.
Highlights
The technological process of hot straightening of steel is one of the most frequently performed operations in the shipbuilding industry
The heated steel develops tarnish colours that are closely related to the temperature that the material reaches at a given moment, which affects the full control of the process
The research presented in this paper has shown that the flame straightening process has no negative impact on the mechanical properties of the material
Summary
The technological process of hot straightening of steel is one of the most frequently performed operations in the shipbuilding industry. The heated steel develops tarnish colours that are closely related to the temperature that the material reaches at a given moment, which affects the full control of the process This allows the process to be carried out without phase changes occurring in the material. Reheating the steel to a temperature higher than 500°C, for example in operating conditions or during welding, is followed by separation of chromium carbide in the form of a grid, often intermittently at grain boundaries in the welding heat affected zone. This process is associated with chromium depletion of areas adjacent to austenite grain boundaries and intergranular corrosion.
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