Method for the production of steel components with fire resistance

A steel supporting structure for a construction,

• wherein the steel supporting structure comprises, as structural construction components for complying with requirements of fire-resistance, a plurality of structural construction steel components each provided with an aluminum-containing hot-dip galvanizing layer;
• wherein the steel supporting structure is free of additional structural fire-protection measures and devices and wherein the steel supporting structure does not comprise any additional structural fire-protection elements;
• wherein the structural construction steel components provided with the aluminum-containing hot-dip galvanizing layer each have, at temperatures in a range of from 500° C. to 850° C., an emissivity εm of a surface in a range of from 0.05 to 0.60,
• wherein the aluminum-containing hot-dip galvanizing layer has the following composition, wherein all quantities stated below are to be selected such that a total of 100 wt. % results:
• (i) zinc (Zn) in amounts of from 92 wt. % to 96 wt. %,
• (ii) aluminum (Al) in amounts of from 4 wt. % to 8 wt. %,
• (iii) at least one further metal which is selected from the group consisting of bismuth (Bi), lead (Pb), tin (Sn), nickel (Ni), silicon (Si), magnesium (Mg) and combinations thereof, in amounts of from 0.001 wt. % to 10 wt. %, with the proviso that a magnesium content is less than 0.2 wt. %.

Use of an aluminum-containing hot-dip galvanizing layer for producing fire-resistance on or onto a steel component and for providing a steel component with fire-resistance,

• wherein a steel component which is to be provided with fire-resistance is subjected to a hot-dip galvanizing process using an aluminum-containing zinc melt, so as to provide the steel component with an aluminum-containing hot-dip galvanizing layer;
• wherein the aluminum-containing hot-dip galvanizing layer is applied to the steel component with a layer thickness in a range of from 4 μm to 25 μm and
• wherein the aluminum-containing hot-dip galvanizing layer has an aluminum content in a range of from 4 wt. % to 8 wt. %;
• wherein the hot-dip galvanizing is performed in such a way and with the proviso that the steel component provided with the aluminum-containing hot-dip galvanizing layer has, at temperatures in a range of from 500° C. to 850° C., an emissivity εm of a surface of the steel component in a range of from 0.05 to 0.60;
• wherein the aluminum-containing hot-dip galvanizing layer has the following composition, wherein all quantities stated hereinbelow are to be selected such that a total of 100 wt. % results:
• (i) zinc (Zn) in amounts of from 92 wt. % to 96 wt. %,
• (ii) aluminum (Al) in amounts of from 4 wt. % to 8 wt. %,
• (iii) at least one further metal which is selected from the group consisting of bismuth (Bi), lead (Pb), tin (Sn), nickel (Ni), silicon (Si), magnesium (Mg) and combinations thereof, in amounts of from 0.001 wt. % to 10 wt. %, with the proviso that a magnesium content is less than 0.2 wt. %.

A method for providing a steel-based article with fire-resistance,

• wherein the method comprises the following steps:
• a steel-based article which is to be provided with fire-resistance is subjected to a hot-dip galvanizing process using an aluminum-containing zinc melt, so as to provide the steel-based article with an aluminum-containing hot-dip galvanizing layer;
• wherein the aluminum-containing hot-dip galvanizing layer is applied to the steel-based article with a layer thickness in a range of from 4 μm to 25 μm and
• wherein the aluminum-containing hot-dip galvanizing layer has an aluminum content, based on the aluminum-containing hot-dip galvanizing layer, in a range of from 4 wt. % to 8 wt. %;
• wherein the hot-dip galvanizing is performed in such a way and with the proviso that the steel-based article provided with the aluminum-containing hot-dip galvanizing layer has, at temperatures in a range of from 500° C. to 850° C., an emissivity εm of a surface of the steel-based article in a range of from 0.05 to 0.60;
• wherein the aluminum-containing hot-dip galvanizing layer has the following composition, wherein all quantities stated hereinbelow are to be selected such that a total of 100 wt. % results:
• (i) zinc (Zn) in amounts of from 92 wt. % to 96 wt. %,
• (ii) aluminum (Al) in amounts of from 4 wt. % to 8 wt. %,
• (iii) at least one further metal which is selected from the group consisting of bismuth (Bi), lead (Pb), tin (Sn), nickel (Ni), silicon (Si), magnesium (Mg) and combinations thereof, in amounts of from 0.001 wt. % to 10 wt. %, with the proviso that a magnesium content is less than 0.2 wt. %.