Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More A This guide covers standard specification for round, square, rectangular, and special shape, electric-resistance-welded mechanical tubing, either zinc-coated galvanized after welding or produced from aluminum-coated, zinc-coated galvanized , zinc-iron alloy-coated galvannealed , or aluminum-zinc alloy-coated steel sheet. Low-carbon steels and other carbon steels shall conform to the required chemical composition for carbon, manganese, phosphorus, and sulfur. The steels shall conform to elemental tolerances for product analysis.

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Learn more. Produced in sizes ranging from 1. For a complete listing of sizes produced, please visit our Steel Tubing Product Catalog. ASTM A 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. The resultant coating is harder than normal galvanized and is more resistant to scratching and damage. A Type 4 tubing has a matte finish and is most often used in applications where the tubing is to be painted.

ASTM A 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 A Tubing produced to A 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. Valmont websites. Finishes and Chemistries Learn more.

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Value Added Services Learn more. A53 Learn more. A Learn more. Product Literature Learn more. Welded Steel Tubing Glossary Learn more. Shipping Information Learn more. Mission and Values Learn more. Business Values Learn more. Markets Learn more. Contact Us Learn more. Steel Tubing Terms and Conditions Learn more. Careers Learn more. A Type 2 ASTM A 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.

As a standard, Valmont applies a recoating of the weld seam area after welding for types 1, 2 and 4. If no recoating of the weld seam is requested, please provide that information at time of quote and order placement.

Physical testing yield, tensile and elongation is not required under A If there is a specific strength requirement for your application, please be sure to include at the time of inquiry as that will affect the chemistry required. Flash control of the ID weld bead is discussed in section 7.

Valmont produces tubing to flash control 0. ASTM A is a related mechanical tubing specification that covers non-metallic coated carbon and alloy steel tubing. For more detailed information on the A specification and to purchase a copy, please visit the ASTM website. All Product Pages Badge 1 Very small paragraph, words. Learn More. All Product Pages Badge 2 Very small paragraph, words. All Product Pages Badge 3 Very small paragraph, words.

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