Method for producing pipe steel

Abstract

The invention relates to a method for the production of microalloyed steels, in particular pipe steels, wherein a cast slab (1) passes through a device (2) in the conveying direction (F) of the slab (1) at The sequence has a casting machine (3), a first melting furnace (4), at least one roughing stand (5), a second melting furnace (6), at least one finishing stand (7) and a cooling section (8), wherein the The method comprises: a) defining for the slab (1) a desired temperature profile on its progress through the device (2); b) applying at least one influence for tempering the slab (1) according to the defined temperature profile The temperature-influencing elements (9, 10) are positioned in the production line (L) of the plant (2), wherein the temperature-influencing elements (9, 10) are introduced into the first melting furnace (4) and the at least one roughing stand (5) and / or between the second melting furnace (6) and the at least one finishing stand (7); c) producing slabs (1) in equipment (2) designed in such a way that the at least one temperature-influencing The elements (9, 10) are operated such that the defined temperature profile is at least largely maintained. Furthermore, the invention relates to a plant for the manufacture of microalloyed steels.

Description

technical field [0001] The invention relates to a method for manufacturing microalloy steel, especially pipe steel method, wherein the cast slab (Bramme) passes through a plant which has in this order a casting machine, a first melting furnace, at least one roughing stand (Vorwalzgerüst), a second melting furnace, at least one A finishing stand and cooling section (Kuehlstrecke). Furthermore, the invention relates to a plant for the manufacture of microalloyed steels. Background technique [0002] Various possibilities are described in the prior art for the production of strips, which work according to this type of method. Reference is made, for example, to documents US 2005 / 0115649A1, WO 2009 / 012963A1, WO 2007 / 073841A1, WO 2009 / 027045A1, EP 0 611 610B1 and EP 1 860 204A1. [0003] The established method is thermomechanical rolling. Recently, microalloyed steels have become more and more important. In this context, tubular steel (according to API specification 5L) is o...

AI Technical Summary

Problems solved by technology

[0006] Disadvantageously, the processing devices and methods known in advance are not optimally suited to react flexibly to the corresponding initial conditions and requirements when processing microalloyed steels, especially tube steels, in order to Largely freely selectable temperature profiles (Temperaturprofil) for machining these steel types

It is thus not possible to optimally control and influence the microstructure development in the steel

Therefore, the flexible production of the mentioned steels with regard to their chemical composition and dimensions (Abmessung) is limited

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