Valmont Tubing produces round electric resistance welded (ERW) metallic-coated carbon steel mechanical tubing to ASTM specifications A787 Type1 (aluminized), Type 2 (galvanized), Type 3 (hot-dip galvanized), Type 4 (galvannealed) and Type 6 (zinc-aluminum-magnesium alloy coated). Produced in sizes ranging from 1.05 inch OD up to 12.75 inch OD and in nominal wall thicknesses beginning at 18 gauge (0.049") and heavier, Valmont's ASTM A787 tubing is used in a variety of agricultural, industrial, transportation and industrial-related end uses. For a complete listing of sizes produced, please visit our Steel Tubing Product Catalog.
ASTM A787 Type 1 welded mechanical tubing is produced using aluminized steel, which is carbon steel that has been pre-coated on both sides with an aluminum silicon alloy while in coil form. A787 Type 1 tubing is often used in applications where heat resistance and corrosion resistance are important.
ASTM A787 Type 2 welded mechanical tubing is produced using carbon steel that has been pre-coated with a thin layer of zinc while in coil form. A787 Type 2 tubing is often used in applications where rust resistance is critical and provides for extended durability than non-coated carbon steel.
ASTM A787 Type 3 welded mechanical tubing is produced out of a hot rolled carbon steel and then is hot-dip galvanized per ASTM A123 specification into a tank of molten zinc after the tubing is already formed and welded. A787 Type 3 tubing is often used in applications where rust resistance and extended durability are critical. The hot-dip galvanizing process also allows for small batches of tubing to be galvanized at one time.
ASTM A787 Type 4 welded mechanical tubing is produced using carbon steel that has been pre-coated with a thin layer of zinc while in coil form and then heat treated to convert the coating into a zinc-iron alloy. The resultant coating is harder than normal galvanized and is more resistant to scratching and damage. A787 Type 4 tubing has a matte finish and is most often used in applications where the tubing is to be painted.
ASTM A787 Type 6 welded mechanical tubing is produced using steel that has been pre-coated with a thin layer of a zinc-aluminum-magnesium alloy coating while in coil form as specified in ASTM A1046. Tubing produced to A787 Type 6 provides a high degree of corrosion resistance and an excellent surface appearance and is a bridge between stainless and hot-dip galvanized finishes.
Please contact one of our knowledgeable sales staff members, who will assist you with any further questions regarding this specification or with your specific tubing requirements.
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