Raahe, Finland
Raahe, Finland

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Patent
Rautaruukki Oyj | Date: 2014-01-15

The invention relates to transport container and to a floor structure (2) for transport a container (1). The floor structure (2) comprises a first surface layer (8), a support arrangement (10, 11) for supporting the first surface layer (8) from the side of the bottom surface (15) and one or more gripping part channels (30) arranged to the side of the bottom surface (15) of the first surface layer (8) for receiving a fork of a forklift loader. The gripping part channel (30) comprises first and second side walls (32, 34) protruding from bottom surface (15) of the first surface layer (8) and forming the gripping part channel (30) between them. The floor structure (2) further comprises one or more oblique gripping part channel supports (40, 41) provided adjacent to and in connection with gripping part channel (30) for providing additional support for the gripping part channel (30).


Patent
Rautaruukki Oyj | Date: 2015-01-23

The present invention relates to thin hot-rolled ultrahigh strength steel (UHSS) products, i.e. to hot-rolled steel strips with ultrahigh strength and good bendability. The object of the present invention is to provide an ultrahigh strength hot-rolled steel product that is having yield strength R_(p0.2 )at least 840 MPa and improved bendability. Further, a preferred aim is also to achieve an ultrahigh strength steel strip with excellent low temperature impact toughness. The inventors of the present invention have surprisingly found that the bendability of directly quenched ultrahigh strength steel strip can be significantly improved by producing a microstructure comprising upper bainite as main phase and by having a hot-rolled steel strip product having a yield strength R_(p0.2 )at least 840 MPa and a thickness of less than 12 mm, whose composition in percentage by weight is C: 0.03-0.08, Si: 0.01-0.8, Mn: 0.8-2.5, Al: 0.01-0.15, Cr: 0.01-2.0, B: 0.0005-0.005 Nb: 0.005-0.07, Ti: 0.005-0.12, N:<0.01, P:<0.02, S:<0.004, and optionally Ca less than 0.01, V less than 0.1, Mo less than 0.5, Cu less than 0.5 and Hi less than 0.5, the rest being Fe and unavoidable impurities.


Patent
Rautaruukki Oyj | Date: 2013-02-06

Joint and stiffener system for a highway guardrail, which highway guardrail is composed of essentially vertical guardrail pillars (1) installed at a distance from one another and of essentially horizontal rails (2) fixed to them, which rails are open profiles, the open part of which is directed towards the guardrail pillar (1), and which joint and stiffener system comprises a joint part/stiffener part (4). The invention is implemented such that the joint part/stiffener part (4) is installed at least partly inside the rail (2), and that the joint part/stiffener part (4) is a closed profile.


Patent
Rautaruukki Oyj | Date: 2013-04-10

System for anchoring in the ground (5) the end (2) of a highway guardrail (1), which system comprises at least one anchoring tube (3) to be installed partly in the ground, by the aid of which the end (2) of the guardrail is anchored in the ground. The invention is implemented such that the end (2) of the guardrail comprises at least one anchoring tube (3) and guide part (6).


Patent
Rautaruukki Oyj | Date: 2013-12-04

The present invention relates to a wall or roof structure and building panels (2). The wall structure comprises support pillars (10) and building panels (2) comprising a first surface sheet (4) and a second surface sheet (6) and an insulation material layer (8) between surface sheets (4, 6). The building panels (2) are secured to the support pillars (10) such that the second surface sheet (4) is arranged against a support pillar (10) for providing a support joint. The support joint is provided with an elastic support joint sealing (16) arranged between the support pillar (10) and the second surface sheet (4) for providing airtight sealing, and that at least one of the first and second surface sheets (4, 6) is provided with restricted thermal expansion for maintaining the airtight sealing by decreasing mechanical stress subjected to the elastic support joint sealing (16) due to thermal expansion.


Patent
Rautaruukki Oyj | Date: 2016-08-03

A building element, building structure, an apparatus and a method for monitoring condition of the building element or structure is disclosed. There is provided a building element, comprising at least two internal nodes located inside the building element and capable of wireless radio communications, wherein at least one internal node is configured to determine condition information of the building element based on at least one signal sent between the internal nodes.


There is disclosed a method of manufacturing a hot-rolled steel product, such as a hot-rolled steel strip or plate product, wherein the microstructure of the steel product is martensitic, having Brinell hardness of at least 450 HBW. The method comprises the following steps in given sequence: a step of providing a steel slab containing, in terms of weight percentages, C: 0.25-0.45%, Si: 0.01-1.5%, Mn: 0.4-3.0%, Ni: 0.5-4.0%, Al: 0.01-1.2%, Cr: less than 2.0%, Mo: less than 1.0%, Cu: less than 1.5%, V: less than 0.5%, Nb: less than 0.2%, Ti: less than 0.2%, B: less than 0.01%, Ca: less than 0.01%, the balance being iron, residual contents and unavoidable impurities; a heating step of heating the steel slab to a temperature T_(heat )in the range 950-1350 C.; a temperature equalizing step; a hot-rolling step in a temperature range of Ar3 to 1300 C. to obtain a hot-rolled steel material; and a step of direct quenching the hot-rolled steel material from the hot-rolling heat to a temperature of less than Ms. The prior austenite grain structure of the obtained steel product is elongated in the rolling direction so that the aspect ratio is greater than or equal to 1.2.


The present invention relates to a method for manufacturing high strength formable steel, to a high strength formable continuously annealed steel strip product and to a steel coil. Especially the present invention relates to those steel strips, which utilize microalloying based strengthening instead of substantial phase hardening. The present invention is based on the idea of direct quenching the microalloyed hot-rolled steel strip after the last hot-rolling pass of the hot-rolling step to a temperature below 400 C and subjecting such quenched steel strip to a continuous annealing at a temperature between 400 and 900 C. This way at least part of, preferably at least most of the microalloying elements stay uniformly in the solution during the manufacturing of hot-rolled strip and they include precipitation potential for the following process step(s). Due to the present invention, the produced steel strip is extremely well formable taking into account the strength level.


The invention relates to a method and arrangement for installing an energy exchange unit (4) to a roof (2) of a building (1), and to an energy exchange element (3). In the arrangement the energy exchange unit (4) is supported on the roof trusses (10) in the installation area (5) such that bottom surface (31) of the energy exchange unit (4) is positioned between upper surface of the roof trusses (10) of the roof (2) and bottom surface of the battens (12) of the roof (2).


There is disclosed a method of manufacturing a hot-rolled steel product, such as a hot-rolled steel strip or plate product, having Brinell hardness of at least 450 HBW. The method comprises the following steps in given sequence: a step of providing a steel slab containing, in terms of weight percentages, C: 0.25-0.45%, Si: 0.01-1.5%, Mn: 0.4-3.0%, Ni: 0.5-4.0%, Al: 0.01-1.2%, Cr: less than 2.0%, Mo: less than 1.0%, Cu: less than 1.5%, V: less than 0.5%, Nb: less than 0.2%, Ti: less than 0.2%, B: less than 0.01%, Ca: less than 0.01%, the balance being iron, residual contents and unavoidable impurities; a heating step of heating the steel slab to a temperature T_(heat) in the range 950-1350C; a temperature equalizing step; a hot-rolling step in a temperature range of Ar3 to 1300C to obtain a hot-rolled steel material; and a step of direct quenching the hot-rolled steel material from the hot-rolling heat to a temperature of less than Ms. The prior austenite grain structure of the obtained steel product is elongated in the rolling direction so that the aspect ratio is greater than or equal to 1.2.

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