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Influence of flame straightening on the properties of welded joints made of X2CrNi22-2 duplex steel

Lange Artur

Materials Science Poland

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2021

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Vol. 39, No. 3

446--457

EN

The study investigates the optimal conditions associated with flame straightening of welded joints in duplex steel grade X2CrNi22-2. The research aimed to assess the influence of heat, applied during flame straightening of welded structures in X2CrNi22-2 grade steel, on the properties of the welded joints. Based on the macroscopic, microscopic, and strength tests conducted on welding joints in X2CrNiN22-2-grade duplex steel that have been subjected to flame straightening, it was ascertained that post-welding flame straightening of this grade of steel, at a treatment temperature of 730°C, should not take place for >1 min. The temperature of 730°C has been chosen as a reference because of the assumption that the welded joints are heated to the temperature of 700–730°C during straightening with an acetylene-oxygen flame. The paper scrutinizes the questions of (i) what changes occur in the welded joints as a result of flame straightening carried out in this temperature range and (ii) what impact those changes have on the joint strength. The results of our study indicate that the duration of post-welding flame straightening of X2CrNiN22-2-grade duplex steel, at a treatment temperature of 730°C, should not exceed 1 min.

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Influence of process of straightening ship hull structure made of 316L stainless steel on corrosion resistance and mechanical properties

Kowalski Jakub, Licznerski Łukasz, Supernak-Marczewska Milena, Emilianowicz Krzysztof

Polish Maritime Research

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2020

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nr 4

103--111

EN

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 oxyacetylene 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.

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Poprawa efektywności wybranych procesów termicznych

Baran K.

Przegląd Spawalnictwa

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2014

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R. 86, nr 9

24--27

PL

W artykule przedstawiono propozycje firmy Linde pozwalające w znaczący sposób zoptymalizować procesy termiczne powszechnie stosowane w produkcji spawalniczej. Opisane rozwiązania dotyczą procesów, takich jak cięcie, prostowanie płomieniowe i podgrzewanie. Poprawę efektywności procesów termicznych będących tematem artykułu, uzyskuje się przez odpowiednie połączenia trzech elementów, jakimi są wiedza, narzędzie (palnik) i acetylen jako gaz palny. Tekst zawiera parametry z wdrożeń przemysłowych, co pozwala ocenić skuteczność proponowanych rozwiązań.

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Płomieniowe prostowanie wysokowytrzymałych, drobnoziarnistych stali konstrukcyjnych.

Herold H., Pieschel J., Woywode N.

Biuletyn Instytutu Spawalnictwa w Gliwicach

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1999

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R. 43, nr 5

101-109

PL

Opis badań nad wpływem płomieniowego prostowania na stan naprężeń w spawanych elementach wykonanych z wysokowytrzymałych, drobnoziarnistych stali konstrukcyjnych. Badania przeprowadzono na blachach od 8 do 20 mm ze stali o granicy plastyczności 690 MPa obrobionych termomechanicznie i ulepszanych cieplnie. Badano złącza doczołowe o wymiarach laboratoryjnych oraz złącza wielkogabarytowe wykonane metodą MAG. Do prostowania płomieniowego wykorzystano palniki acetylenowo-tlenowe. Stwierdzono, że prostowanie płomieniowe ingeruje w stan naprężeń włanych spawanych elementów konstrukcyjnych, ale naprężeń nie usuwa. Likwidacja odkształceń przez płomieniowe prostowanie wymaga wielokrotnrgo powtarzania procesu prostowania.

EN

It has been described the influence of flame straightening on the state of stress in welded elements made of high-strength fine-grained constructional steel. For investigation, it was used 8-20 mm thick plates of steel having yield point of 690 MPa, thermomechanically treated and toughened. It was tested laboratory-sized and large-sized MAG welded butt joints. For flame straightening oxy-acetylene blowpipes were used. It was found that flame straightening interfered in residual stress of welded constructional elments but did not make it away. Elimination of distortions by flame straightening requires that straightening process is repeated many times.