摘要:
The invention relates to a device for strip guidance in a hot medium, comprising a deflection roller (3, 38) which has two roller pins (23, 39) and is mounted to supporting arms (1, 2, 34, 37, 54, 57) by means of ceramic journal bearings (20, 31), wherein the journal bearings (20, 31) are in each case arranged in a bearing receptacle (45, 55) of the associated supporting arm (1, 2, 34, 37, 54, 57). The invention is characterized in that at least one of the journal bearings (20, 31) in its associated supporting arm (1, 2, 34, 37, 54, 57) is fixed in the bearing receptacle (45, 55) by means of a force-fit that engages on the outer edge of the journal bearing (20, 31) and balances the different heat expansion coefficients of the journal bearings (20, 31) and the bearing receptacle (45, 55).
摘要:
The invention relates to a device for strip guidance in a hot medium, comprising a deflection roller (3, 38) mounted on supporting arms (1, 2, 34, 37, 54, 57) and a carrier device holding the supporting arms (1, 2, 34, 37, 54, 57). The device is characterized in that one of the supporting arms (1, 2, 34, 37, 54, 57) is mounted on the carrier device by means of a floating bearing (5), wherein the floating bearing (5) allows the mounted supporting arm on the carrier device to move parallel to the longitudinal direction of the deflection roller (3, 38), and in that an elastic counter element (12), which acts parallel to the longitudinal direction of the deflection roller (3, 38) upon the supporting arm (1, 2, 34, 37, 54, 57) mounted on the floating bearing (5), is present and counteracts an increasing distance between the supporting arms (1, 2, 34, 37, 54, 57). In this way, the technical problems of offsetting a temperature-induced length change of the deflection roller and avoiding an uncontrolled movement of the system are solved.
摘要:
The invention relates to an apparatus and a process for the hot-dip coating of a metal strip (M) with a metallic coating, in which the metal strip (M) is passed continuously through a molten bath (3), in which the thickness of the metallic coating that is present on the metal strip (M) when it leaves the molten bath (3) is set by means of a stripping device (7), and in which slag (S) that is present on the molten bath (3) is driven away from the metal strip (M) leaving the molten bath (3) by means of a stream of gas (G1, G2). In order to prevent slag from coming into contact with the metal strip leaving the molten bath by simple and inexpensive means in the case of such a process, and thus ensure optimum quality of the surface, to drive the slag (S) away from the metal strip (M), the invention proposes directing a stream of gas (G1, G2) that extends over the width (B) of the metal strip (M) onto the surface (6) of the molten bath (3) by means of at least one nozzle (10, 11) arranged closely alongside the metal strip (M).
摘要:
The invention relates to the field of materials science and to a device for reducing pressure in cavities in media at higher temperatures, such as those devices which can be used for devices for hot-dip coating metal materials in the metal processing industry for example. The aim of the invention is to provide a device by means of which pressure can be reduced in the cavity of the hollow bodies in a reliable and controlled manner and simultaneously the penetration of the media can be delayed or completely prevented at the higher temperatures. This is achieved by a device for reducing pressure in hollow bodies in media at higher temperatures, wherein at least one opening to the cavity of the hollow body is provided in hollow body regions which are not used for the intended application, said opening being closed from the medium surrounding the hollow body by at least one component made of a gas-permeable metal or ceramic material.
摘要:
The invention relates to a flat steel product which has a tensile strength (R m ) of at least 1200 MPa and which consists of a steel that contains (in wt.%) C: 0.10 - 0.50%; Si: 0.1 - 2.5%; Mn: 1.0 - 3.5%; Al: up to 2.5%; P: up to 0.020%; S: up to 0.003%; N: up to 0.02%, and optionally one or more of the elements "Cr, Mo, V, Ti, Nb, B and Ca" in the following quantities: Cr: 0.1 - 0.5%; Mo: 0.1 - 0.3%; V: 0.01 - 0.1%; Ti: 0.001 - 0.15%; Nb: 0.02 - 0.05%, wherein Σ(V,Ti,Nb) ≤ 0.2% for the sum Σ(V,Ti,Nb) of the quantities of V, Ti and Nb; B: 0.0005 - 0.005%; and Ca: up to 0.01% in addition to Fe and unavoidable impurities, and the flat steel product has a microstructure with (in surface percentage) less than 5% ferrite, less than 10% bainite, 5 - 70% untempered martensite, 5 - 30% residual austenite, and 25 - 80% tempered martensite, at least 99% of the iron carbide contained in the tempered martensite having a size of less than 500 nm. The flat steel product has an optimized deformability on the basis of the minimized proportion of over-tempered martensite. The method according to the invention provides a heat treatment by means of which the microstructure that is optimal for said property can be produced in a controlled manner.