Masonry Magazine June 1985 Page. 27
Galvanizing Specifications
B-1, 3 inch and over in thickness and over 15 inches long requires 2.0 oz/ft².
B-2, under inch and over 15 inches long. 1.5 oz/ft.
B-3, any thickness and less than 15 inches long. 1.3 oz/ft.
ASTM A123-Specifications for Zinc (Hot Galvanized) Coatings on Products and Fabricated from Rolled, Pressed, and Forged Steel Shapes, Plates, Bars, and Strip
* Covers galvanizing on plates etc. ½ inch thick and heavier by dipping
* Weight of zinc coating per square foot of actual surface should average 2.0 oz for material % to 6 inch thick. For inch and thicker material, the average coating should be at least 2.3 oz ft.
* One ounce of zinc per square foot of surface is mathematically equivalent to a coating thickness of 0.0017 inches
* One gram per square meter corresponds to 0.141 microns
ASTM A525-Specification for Steel Sheet, Zinc-Coated (Galvanized by Hot Dip Process) General Requirements
* Covers galvanizing of sheet steel from 8 ga (0.1681 in) to 32 ga (0.0134 in) on continuous lines by hot dipping. Steel is subsequently cut to shape and formed after galvanizing is complete
* Total weight of coating stated is for both sides of the sheets
* Products referred to as complying with this standard should include the required weight of steel in their specifications
* Standard zinc coatings vary from G 01 designation, which has no minimum, to G 235 designation, which has a weight of 2.35 oz/ft when tested by the Triple Spot Test
ASTM standards usually used to specify galvanizing to its proper diameter and after sheet steel has been rolled to its desired thickness. During mill galvanizing, zinc can be applied in a variety of thicknesses. The current ASTM Standards specify a minimum thickness requirement for a variety of class coatings.
Another process is hot dipping, in which a completely fabricated part or assembly is dipped into molten zinc until a specified minimum amount of zinc adheres to the base metal. Table 3 lists highlights of the ASTM specifications governing galvanizing for masonry work and shows the minimum amount of zinc coating required for each class.
Stainless Steel. Stainless steel wire and connectors are sometimes used in very corrosive environments. The stainless steel specified is generally one of the standard austenitic stainless steels conforming to AISI 300 Series and ASTM Standard 167. This steel contains about 18 percent chromium and 8 percent nickel and resists corrosion uniformly.
Sometimes in the interest of improving corrosion resistance, designers will consider welding stainless steel ties to galvanized joint reinforcement, or using stainless steel screws to fasten anchors to carbon steel studs. This practice is not recommended, since the dissimilar metals, even though both steel, can cause a galvanic cell to be formed and actually increase corrosion.
Copper-Coated Wire and Hard-Drawn Copper Wire. The use of hard-drawn copper clad wire conforming to ASTM B 227 is essentially limited to individual ties. It is not recommended for continuous joint reinforcement or continuous ties. Hard-drawn copper cannot be welded, resulting in severe limitations to its use. Also, due to its electrochemical properties, when copper-coated wire is
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MASONRY-MAY/JUNE, 1985 27