Oven rack having integral lubricious, dry porcelain surface

A lubricious glass-coated steel article, said article capable of withstanding a hydrogen-emitting temperature sufficient to emit hydrogen gas from the steel such that hydrogen gas emitted from the steel is contained within cavities formed in the steel during drawing, without escaping through the glass coating, such that the glass coating does not chip or crack at said hydrogen-emitting temperature, wherein the steel rod is drawn to reduce the diameter of the steel rod at least 20%, and the steel comprises the following components by weight:

• Iron:
• about 80% to about 99.9%;
• Carbon:
• up to about 0.08%;
• and
• A transition metal selected from Vn, Ta, Ti, Ni or mixture of any two or more:
• 0.001% to about 0.2%,
• wherein the amount of carbon in the steel rod material, the amount of carbon stabilizing transition metal in the steel rod material and the degree to which the diameter of the cross-sectional area of the steel rod material is reduced, when the steel wire is drawn from the steel rod material, are selected to prevent chipping of the glass material away from the outer surface of the article due to the release of hydrogen gas from the steel wire members when the glass-coated steel wire members are heated to a temperature above 900° F.;
• and
• wherein the glass surface includes a dry refractory lubricant material, and the dry refractory lubricant material consists of particles having a particle size less than 45 μm and an aspect ratio of less than 2:1.

A lubricious glass-coated steel wire oven rack comprising:

• a plurality of elongated steel wire members joined together to form an oven rack having an outer surface;
• the plurality of elongated steel wire members being made from a steel rod material containing up to about 0.08% by weight carbon;
• the plurality of elongated steel wire members being made from the steel rod material by drawing the steel rod material to form steel wire;
• wherein the diameter of the cross-sectional area of the steel rod material is reduced by at least about 20% when the steel rod material is drawn to form the steel wire;
• the outer surface of the oven rack being coated by a dry lubricious glass material containing a dry refractory lubricant, the dry refractory lubricant consisting of particles having a particle size less than 45 μm and an aspect ratio of less than 2:1;
• wherein the amount of carbon in the steel rod material and the degree to which the diameter of the cross-sectional area of the steel rod material is reduced, when the steel wire is drawn from the steel rod material, are selected to prevent chipping of the glass material away from the outer surface of the article due to the release of hydrogen gas from the steel wire members when the glass-coated steel wire members are heated to a temperature above 900° F.

A method of making a lubricious glass-coated steel wire oven rack, comprising the steps of:

• a) providing steel rod material containing from about 80 to about 99.9% by weight of iron, up to about 0.08% by weight of carbon and from about 0.001 to about 0.2% by weight of carbon stabilizing transition metal selected from the group consisting of Vanadium, Tantalum, Titanium and Niobium;
• b) drawing the steel rod material to form steel wire, wherein the diameter of the cross-sectional area of the steel rod material is reduced by at least about 20%;
• c) forming a plurality of elongated steel wire members from said steel wire;
• d) joining the plurality of steel wire members to one another to form interconnected parts of a steel wire oven rack;
• and
• e) coating the steel wire oven rack with a lubricious porcelain containing about 1% to about 10% by weight of a dry refractory lubricant, the dry refractory lubricant consisting of particles having a particle size less than 45 μm and an aspect ratio of 2:1;
• wherein the amount of carbon in the steel rod material, the amount of carbon stabilizing transition metal in the steel rod material and the degree to which the diameter of the cross-sectional area of the steel rod material is reduced, when the steel wire is drawn from the steel rod material, are selected to prevent chipping or spalling of the glass material away from the outer surface of the article due to the release of hydrogen gas from the steel wire members when the glass-coated steel wire members are heated to a temperature above 900° F.

A method of cleaning a porcelain-coated steel wire oven rack capable of withstanding oven cleaning temperatures above 900° F. without porcelain chipping or cracking, comprising the steps of:

• heating the oven to a temperature above 900° F., said oven containing said porcelain-coated steel wire oven rack formed by steps a)-e):
• a) providing steel rod material containing from about 80 to about 99.9% by weight of iron, up to about 0.08% by weight of carbon and from about 0.001 to about 0.2% by weight of carbon stabilizing transition metal selected from the group consisting of Vanadium, Tantalum, Titanium and Niobium;
• b) drawing the steel rod material to form steel wire, wherein the diameter of the cross-sectional area of the steel rod material is reduced by at least about 20% to form cavities in the steel wire in which hydrogen, emitted from the steel wire, is received and compressed at the oven cleaning temperature, without chipping or cracking the porcelain coating;
• c) forming a plurality of elongated steel wire members from said steel wire;
• d) joining the plurality of steel wire members to one another to form interconnected parts of a steel wire oven rack;
• and
• e) coating the steel wire oven rack with a lubricious porcelain containing a dry refractory lubricant material, the dry refractory lubricant material consisting of particles having a particle size less than 45 μm and an aspect ratio of less than 2:1,
• wherein the amount of carbon in the steel rod material, the amount of carbon stabilizing transition metal in the steel rod material and the degree to which the diameter of the cross-sectional area of the steel rod material is reduced, when the steel wire is drawn from the steel rod material, are selected to prevent chipping of the glass material away from the outer surface of the article due to the release of hydrogen gas from the steel wire members when the glass-coated steel wire members are heated to a temperature above 900° F.