Valmont Tubing produces square, rectangle, round and specially shaped electric resistance welded (ERW) high strength, low alloy (HSLA) atmospheric corrosion resistant structural steel tubing to meet ASTM specification A847. Commonly referred to as weathering steel, ASTM A606 Type 4 high-strength, low-alloy (HSLA) steel utilizes elements such as copper, chromium, nickel and silicon to enhance the protection and resistance to atmospheric corrosion.
Tubes produced to ASTM A847 are mainly used in an unpainted condition where the surface will develop a weathered orange-brown oxide over time that inhibits corrosion. With the additional elements such as those noted above, the added strength of the steel itself allows for a lighter wall thickness of steel to be used than for carbon steel tubing in order to meet structural physical requirements.
For a complete listing of all tubing sizes produced by Valmont, please visit our Steel Tubing Product Catalog.
In addition to the following physical testing, a flattening test is also required for rounds. It is not required for squares and rectangles or other shapes under A847.
| Test | Strength |
|---|---|
| Yield | 50,000 psi |
| Tensile | 70,000 psi |
| Elongation | 19% (Applies to wall thicknesses 0.120 and over. For lighter wall thicknesses, elongation will be by agreement.) |
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