A METAL MATERIALS ( ^[4]) ( ^[16]) ( ^[26]) ( ^[42]) ( ^[50]) ( ^[60])

1. General

   1. Ferrous metals (contains iron)

      1. Iron: Soft, easily worked, oxidizes rapidly, susceptible to acid.

      2. Cast iron: Brittle, corrosion-resistant, high-compressive strength. Used for gratings, stairs, etc.

      3. Malleable iron: Same as above, but better workability.

      4. Wrought iron: Soft, corrosion- and fatigue-resistant, machinable. Used for railings, grilles, screws, and ornamental items.

      5. Steel: Iron with carbon. Strongest metal. Used for structural purposes. See p. 328.

      6. Stainless steel: An alloy for max. corrosion resistance. Used for flashing, handrails, hardware, connections, and equipment.

   2. Nonferrous metals (not containing iron)

      1. Aluminum: Soft, ductile, high corrosion resistance, low strength.

      2. Lead: Dense, workable, toxic, corrosion resistant. Improved with alloys for hardness and strength. Used as waterproofing, sound isolation, and radiation shielding.

      3. Zinc: Corrosion-resistant, brittle, low-strength. Used in "galvanizing" of other metals for corrosion resistance for roofing, flashing, hardware, connections, etc.

      4. Chromium and nickel: Used as alloy for corrosion-resistant bright "plating."

      5. Monel: High corrosion resistance. Used for fasteners and anchors.

      6. Copper: Resistant to corrosion, impact, and fatigue. Ductile. Used for wiring, roofing, flashing, and piping.

      7. Bronze: An alloy for "plating."

      8. Brass: Copper with zinc. Used for hardware, handrails, grilles, etc.

2. Corrosion to Metals

   1. Galvanic action, or corrosion, occurs between dissimilar metals or metals and other metals when sufficient moisture is present to carry an electric current. The farther apart two metals are on the following list, the greater the corrosion of the more susceptible one:

      Anodic (+):

      Most susceptible...