NLMK DanSteel

Frederiksværk, Denmark

NLMK DanSteel

Frederiksværk, Denmark

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Weld joints in fixed marine platforms must be highly reliable. Certain zones of the weld seam may be very hard and hence may act as stress concentrators. Therefore, in some cases, additional heat treatment is required after welding. The microhardness of the basic sections in the weld joint of microalloyed low-carbon streel sheet (thickness 60 mm) obtained by thermomechanical rolling is investigated. Two-coordinate measurements of the microhardness in the basic thermal-influence zones are described. The influence of postweld heat treatment on the microhardness of opposite walls of the weld joint is determined. © 2016, Allerton Press, Inc.


Goli-Oglu E.A.,NLMK DanSteel | Bokachev Y.A.,NLMK DanSteel
Metallurgist | Year: 2015

Lamellar tearing may develop in building metal structures using low-carbon steels in welded joints and assemblies. A reason for its occurrence is an inadequate level of ductility with respect to the degree of welded structure stress in the plate thickness direction. Using results of thick plate tests, we demonstrate the effect of harmful impurities and also of the strength level, structural inhomogeneity, and low-carbon steel slab thickness on the level of relative reduction of area in the thickness direction of plate produced in the NLMK DanSteel 4200 rolling mill. © 2015 Springer Science+Business Media New York.


Investigation of the microstructure and mechanical properties of heavy plates strength grade S355 in thickness range 5–150 mm from low carbon structural steels, microalloyed with vanadium and regulated nitrogen content was made. Main parameters of the microstructure and mechanical properties after hot rolling, normalizing and normalizing rolling were compared. The influence of temperature during heat treatment on the level of mechanical properties was determined in laboratory conditions. The contribution of hardening effect of second phase particles to the strength level of the studied steels was defined. © 2015, Allerton Press, Inc.

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