Grade Summary: Cold Rolled steel sheets are hot dip coated with a durable protective coating of zinc. This material is intended for uses where corrosion is a consideration and where simple bending or moderate forming is involved. They may be bent flat upon themselves (within accepted bend radii) in any direction at room temperature without cracking. Typically this material is provided with a G:90 (or Z275) coating, but it is can be available with a G:60 (or Z180) coating .
Points to Remember: With Galvanize coated steels, contact with lead or copper must be avoided (including products containing lead or copper such as pressure treated lumber) as it can result in accelerated corrosion. In addition, Galvanize coated steels are not recommended (or require additional zinc coatings and/or paint to limit corrosion) for applications near seawater (chlorides accelerate corrosion) or other harsh corrosive environments which have heavy exposure to corrosive chemicals (such as caustic soda, ammonia, lime, hydrochloric acid, nitric acid, hydrogen sulfide, sulfuric acid, sulfur dioxide), or excessive water contact with wet materials or standing water.
For all outdoor applications where the Galvanized material is bare and not painted a minimum G:90 (Z275)is recommended, and for additional protection in corrosive or polluted environments, heavier coated products should be considered.
For end uses where the product is painted and a smooth finish is desired, Galvanealed material or Satincoat Steel (A40) should be used. This steel is dull gray in appearance, has no spangle, and is well suited to painting. Common uses include the manufacture of fireplaces, trailers, signs, and housings. This material should not be utilized in a outside environment without additional protective measures being taken (such as painting).
Typical Applications: Ducting, Air Conditioning & Refrigeration , Any application were additional corrosion resistance is required.
Available products: Flat Sheet only.
Typical Chemical Analysis (Cold Rolled Substrate only): * C – .08 Max. *Mn – .60 Max. *P – .035 Max. *S – .04 Max
Typical Mechanical Properties**:
Tensile Strength (PSI)
Yield Point (PSI)
* Chemical Analysis will vary on each heat number
** All values are minimum and are representative.
*** (% in 2”).
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