ASTM A1085 Structural Steel Pipe and Tubing


ASTM A1085 is a specification for cold-formed welded carbon steel hollow structural sections (HSS) for structural applications. It covers round, square, rectangular, and special-shaped HSS produced by the cold-forming process from hot-rolled steel coils or sheets. Commonly available as hot dipped galvanized or metallically lined tubing.

ASTM A1085 structural steel pipe and tubing offer several advantages for structural applications. They have a high strength-to-weight ratio, making them suitable for lightweight and efficient structures. The cold-formed manufacturing process allows for precise dimensions and consistent wall thickness, ensuring structural integrity. Additionally, the steel used in ASTM A1085 HSS has improved corrosion resistance compared to hot-rolled steel.

Material Composition

The A1085 specification includes multiple grades, including Grade A and Grade B. The specific mechanical properties and chemical composition requirements vary between the grades. Galvanizing protects base steel while lining isolates it from service environment.

ASTM A1085 Structural Steel Pipe and Tubing
ASTM A1085 Structural Steel Pipe and Tubing

Manufacturing Process

Tubes are fabricated by either electric fusion welding or cold finishing. Surface treatments like hot dip galvanizing or application of metallized lining are done in subsequent operations.

Corrosion Resistance

Zinc coating and metallized layer shield the carbon steel tubing, protecting it from rusting and degradation even when exposed to moisture, chemicals or soil environments.


ASTM A1085 structural steel pipe and tubing are commonly used in various construction and structural applications. They can be easily welded, bolted, or connected using other standard methods. Suitable for structural, hydraulic and fluid power applications facing harsh external conditions like piles, light poles, fences etc. Also used in agricultural, mining, construction equipment.


All tubes are hydrostatically tested and meet ASTM A1085 requirements. Proper post coating curing ensures longlasting corrosion shielding during use.

Please contact us for additional information on corrosion resistant tubings or specialized fabrication as per your requirement. We would be glad to assist!

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