Refractory Anchors

Refractory Anchors

A refractory material exhibits superior resistance to decay against heat, chemical attack, or pressure. It can retain its strength and form at higher temperatures. The applications include their use in kilns, furnaces, incinerators, as well as reactors. The hardware for an anchor is first die-stamped, followed by being wire formed or wielded, and roll threaded into different anchoring merchandise. Generally, a critical anchorage is seen on refractories either located on the roof or vertical walls, because they are required to support the weight of a refractory. The temperatures and the operation conditions are stressful, and so, the material is to be sturdy for such a critical operation. Usually, the cross-section of the anchors is either rectangular or circular. The cross-section is dependent on the application. For example, if the cross-section of the anchorage is a circle, the refractory has a lower thickness. Therefore the circular type offers lesser weight support per unit area. Contrast to a circular cross-section, a rectangular variety, is chiefly useful for a refractory that has a higher thickness. Hence, the weight support offered by a rectangle cross-section is higher than that of a circular cross-section.

The materials used in their manufacture include alloys such as stainless steel, Inconel, Monel, Hastelloy. Mostly, industries prefer using stainless steel grades 304, 310, and 316. These stainless steel alloys have a low cost as compared to the other nickel-based alloys. They have superior mechanical strength with high corrosion resistance properties. Additionally, alloys like grade 310 and 316 can withstand high-temperature settings.

These anchors are available in 3 shapes as well as in various sizes -

Flat - Previously, a conventionally used configuration, any workshop can produce them, as they are easy to fabricate. The first step includes the cutting sheets of stainless steel into strips. After which these strips will have a Y-shape appearance due to bending.
Wire - Although complicated to fabricate, they have a round cross-section. This circular cross-section is what bears the load of the castable. Even after getting decayed, the remaining parts of this anchor is still broader than that of the flat-shaped.
Y-shape - The welding of two pieces of a wire results in a Y-shaped component. The melting point of this alloy is as low as 500C. The same low melting point that is responsible for the joining of these two wires breaks up, when not in operation. Hence, the two wires split up.

Industries such as steel, petrochemical, ceramic, cement, thermal, and power industries use a refractory anchor. Generally, parameters such as the type of material used in its construction shape, as well as the quantity of this component are very significant. These have an impact on the service life of the refractory.