RR-W-410G
3. REQUIREMENTS
3.1 Material. Wire rope and strand shall be made of carbon steel, corrosion-resistant steel, or phosphor bronze as specified in the detail requirements for the individual wire ropes and strands.
3.1.1 Carbon steel. Material shall be free from defects that are detrimental to its appearance or serviceability. Steel for wires shall be made by either the open-hearth, basic oxygen, or electric furnace process. Carbon steel is used to manufacture wire rope grades of iron, annealed steel, traction steel, improved plow steel, extra improved plow steel and extra extra improved plow steel.
3.1.2 Phosphor bronze. Unless otherwise specified (see 6.2(c)), phosphor bronze shall be in accordance with composition A of ASTM B139/B139M.
3.1.3 Corrosion-resistant steel. Corrosion-resistant steel wire ropes shall be made of wires of
302 or 304 composition as specified in SAE AIR4127.
3.1.4 Recovered materials. The offeror/contactor is encouraged to use recovered materials to
the maximum extent practicable, in accordance with paragraph 23.403 of the Federal Acquisition
Regulation (FAR).
3.2 Wire rope cores and centers for wire strands. Wire rope cores and centers for wire strands shall be as specified in 3.2.1 through 3.2.5 for the individual wire ropes and strand centers.
3.2.1 Fiber core (see figure 1). Unless otherwise specified, fiber core for wire rope shall be one of the hard fibers or polypropylene fiber. The hard fibers are manila (abaca) and sisal (African, Java, Mauritius, Mexican, and Yucatan). Cotton, hemp, or jute fibers, hard laid, may be used in wire rope cores in fiber sizes of 1/8 inch in diameter and smaller. A mixture of two or more species of hard fibers may be used. Polypropylene fibers shall meet the requirements of
MIL-P-24216. Fiber cores of wire ropes shall be thoroughly cleaned, free from waste, evenly twisted, and of uniform ply.
3.2.2 Wire strand core (see figure 2). The numbers of wires in the wire strand core shall be not less than the number of wires in the strands of the wire rope. Wires in the wire strand core shall be of the same material, or of a lower tensile strength steel (see table I or
ASTM A1023/A1023M as applicable), as the wires in the strands of the wire rope. Iron or annealed steel shall not be used.
3.2.3 Independent wire rope core (IWRC) (see figure 3). IWRC may be a 6 by 7 wire rope with either a fibrous or wire strand (making it a 7 by 7) core. Six by 61 (type I, general purpose,
class 5) and 6 by 91 (type I, general purpose, class 6) wire rope shall have 19 wire strands instead of 7 wire strands (making it a 7 by 19) in the IWRC. Wire rope with an independent wire rope core shall carry the letters IWRC in its description or designation. Wires in the IWRC shall be of the same material, or of a lower tensile strength steel (see table I or ASTM A1023/A1023M as applicable), as the wires in the strands of the wire rope. Iron or annealed steel shall not be used.
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