Steel core brass stair rod

Abstract

A method of making a steel core brass stair rod includes placing a brass billet into a chamber of an extrusion apparatus, where the brass billet includes an aperture configured to receive a steel core. The brass billet is heated to a temperature at which the brass billet is pliable. The brass billet and the steel core are co-extruded through a die of the extrusion apparatus such that the brass billet forms a brass shell which is fused to the steel core, where there is no air gap between the brass shell and the steel core.

1 . A method of making a steel core brass stair rod comprising:
 placing a brass billet into a chamber of an extrusion apparatus, wherein the brass billet comprises an aperture configured to receive a steel core;   heating the brass billet to a temperature at which the brass billet is pliable; and   co-extruding the brass billet and the steel core through a die of the extrusion apparatus such that the brass billet forms a brass shell which is fused to the steel core, wherein there is no air gap between the brass shell and the steel core.   
   
   
       2 . The method of  claim 1 , wherein the temperature is greater than or equal to a melting point temperature of the brass billet. 
   
   
       3 . The method of  claim 1 , wherein the temperature is less than a melting point temperature of the steel core. 
   
   
       4 . The method of  claim 1 , wherein co-extruding the brass billet and the steel core comprises applying a force to a ram of the extrusion apparatus such that the ram causes a pressure plate of the extrusion apparatus to force the brass billet and the steel core through the die. 
   
   
       5 . The method of  claim 4 , wherein the pressure plate comprises an aperture configured to receive the steel core. 
   
   
       6 . The method of  claim 4 , wherein the ram comprises an aperture configured to receive the steel core. 
   
   
       7 . The method of  claim 1 , wherein the die comprises a circular aperture of a specified diameter. 
   
   
       8 . A method of making a steel core brass stair rod comprising:
 placing a brass tube into a chamber of a drawing apparatus, wherein the brass tube is configured to receive a steel core;   heating the brass tube to a temperature at which the brass tube is pliable; and   co-drawing the brass tube and the steel core through a die of the drawing apparatus such that the brass tube forms a brass shell which is fused to the steel core, wherein there is no air gap between the brass shell and the steel core.   
   
   
       9 . The method of  claim 8 , wherein the drawing apparatus further comprises:
 a pressure plate which forms a seal with an interior of the chamber; and   a ram configured to apply a force to the pressure plate such that the pressure plate forces the brass tube and the steel core through the die.   
   
   
       10 . The method of  claim 9 , wherein the ram and the pressure plate comprise apertures configured to receive the steel core. 
   
   
       11 . The method of  claim 8 , wherein the brass tube and the steel core are drawn through the die at an identical rate.