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R Radiator Core Brass See Copper Alloy. Random Lengths See Lengths. Ready to Finish A general mill term applied to size and condition of a product prior to the final drawing or rolling operation. Recrystallization The change in grain structure which occurs when the metal is annealed, during which the deformed grains, strain hardened by working, become new unstrained grains. Red Brass, 85% (Copper Alloy No.230) See Copper Alloy. Red Dip Finish See Finish, Bichromate Dipped Finish. Red Shortness Brittleness in hot metal. Also called Hot Shortness. Red Stain See Stains. Redraw Rod, Redraw Tube, Redraw Wire Stock within a limited range of sizes for further drawing or rolling. Reduction of Area The decrease in the area of the cross-section of a metal test specimen when fractured in tension testing. It is a criterion of ductility. Reeded Outside, Plain Inside Tube See Tube. Reeded Tube See Tube. Reel A device on which wire, flat wire, and narrow strip are wound to facilitate handling and shipping. See figure 17. See also Spool.  Figure 17Reflector Brass (Copper Alloy Nos. 260 and 268) See Copper Alloy. Refractory A term applied to those copper alloys which, because of their hardness or abrasiveness require dimensional tolerances greater than those established for non-refractory alloys. Refrigeration Capillary Tube See Tube. Refrigeration Service Tube See Tube. Relief Annealing See Annealing. Reroll Wire See Redraw Wire. Residual Stress See Stress. Resistance Welding See Welding. Resquared Metal Alternately called square-sheared metal. A product furnished in a flat straight length, brought to final width and length by press shearing of both edges and ends. The edges are straighter than those of slit metal, with the ends at right angles to the edges. Rich Low Brass (Copper Alloy No. 230) See Copper Alloy. Ring or Disc Type Straightening See Straightening. Ripple A slight transverse wave or shadow mark repeated at intervals, sometimes observed on flat products. See Figure 18.  Figure 18
- Exaggerated for IllustrationRockwell Test See Tests. Rod A round, hexagonal or octagonal solid section furnished in straight lengths. See TOLERANCE Section, pages 17, 18, 21 and 22 for Drawn Rod; page 19 for Extruded Rod; and page 20 for Hot Rolled Rod. (1) Brazing Rod— See Brazing Filler Metal. (2) Piston Finish Rod — Round rod having a special surface produced by turning or grinding to close tolerances for diameter and straightness. (3) Shafting — Round rod specially manufactured to the close straightness tolerances required for use in shafting. (4) Welding Rod— Filler metal, in wire or rod form, used in gas welding and brazing processes, and those arcwelding processes wherein the electrode does not furnish the filler metal. Roll A length of flat rolled product wound into a cylindrical spiral. See also Stagger Wound Roll. See Figures 19 and 20. 
Figure 19 Figure 20Roll Flattening See Straightening and Flattening. Roll Straightening See Straightening. Rolled Edge Strip See Strip. Rolled Edges See Finished Edges. Rolled Flat Product See Flat Product. Rolling The process of passing metal between rolls under pressure to reduce its cross-section. (1) Cold Rolling — This process is carried out below the softening point of the metal and, with copper alloys, usually at room temperature. (2) Hot Rolling — This process is carried out above the softening temperature and, with copper alloys, usually at temperatures from about 1200 F to 1700 F, 650 C to 927 C. Rope Fluted Tube See Tube. Rope Reeded Tube See Tube. Roped Tube See Tube. Rotating Band Blank An unfinished tubular blank for making rotating bands for use on artillery projectiles. Sometimes termed Driving Bank Blank or Projectile Band Blank. Rotating Head Straightening See Straightening. Rounded Corners See Finished Edges. Rounded Edges See Finished Edges. Roundness See Tube Measurement Terms. |
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