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A refractory system of the type having a refractory material attached to a wall by anchoring studs has a plurality of improved anchoring studs. These studs have grooves extending from the top toward the bottom of the stud and refractory material in at least some of the grooves. Preferably the groove

A refractory system of the type having a refractory material attached to a wall by anchoring studs has a plurality of improved anchoring studs. These studs have grooves extending from the top toward the bottom of the stud and refractory material in at least some of the grooves. Preferably the grooves are parallel to one another and to a longitudinal centerline through the stud. The studs may have a smooth section on the side wall adjacent the bottom. The bottom may be conical. Spikes may be provided on the top of the stud.

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I claim: 1. A refractory system comprised of a wall, a plurality of anchoring studs attached to the wall, and a refractory material attached to the wall by the anchoring studs, at least some of the anchoring studs comprised of a cylindrical body having a top, a bottom and a side wall extending from

I claim: 1. A refractory system comprised of a wall, a plurality of anchoring studs attached to the wall, and a refractory material attached to the wall by the anchoring studs, at least some of the anchoring studs comprised of a cylindrical body having a top, a bottom and a side wall extending from the top to the bottom, the side wall having a plurality of grooves extending from the top toward the bottom and refractory material being in at least some of the grooves. 2. The refractory system of claim 1 wherein at least some of the grooves are parallel to a longitudinal centerline through the stud and parallel to one another. 3. The refractory system of claim 1 wherein the studs are low carbon steel. 4. The refractory system of claim 1 also comprising a corrosion resistant or erosion resistant coating applied to at least a portion of the body of each stud. 5. The refractory system of claim 1 wherein at least some of the studs have a cross-sectional shape selected from the group consisting of a circle, an oval and a polygon. 6. The refractory system of claim 1 wherein the refractory material is cement or a ceramic. 7. An insulated wall comprised of a wall, a plurality of anchoring studs attached to the wall and an insulating material attached to the wall by the anchoring studs, at least some of the anchoring studs comprised of a cylindrical body having a top, a bottom and a side wall extending from the top toward the bottom, the side wall having a plurality of grooves, at least some of the grooves extending from the top to the bottom of the cylindrical body and the insulating material being in at least some of the grooves. 8. The insulated wall of claim 7 wherein at least some of the grooves are parallel to a longitudinal centerline through the stud and parallel to one another. 9. The insulated wall of claim 7 wherein the studs are low carbon steel. 10. The insulated wall of claim 7 also comprising a corrosion resistant or erosion resistant coating applied to at least a portion of the body of each stud. 11. The insulated wall of claim 7 wherein at least some of the studs have a cross-sectional shape selected from the group consisting of a circle, an oval and a polygon.