ASTM A847 / A847M
This specification covers cold-formed welded and seamless high-strength, low-alloy round, square, rectangular, or special shaped structural tubing for welded, riveted, or bolted construction of bridges and buildings and for general structural purposes where high strength and enhanced atmospheric corrosion resistance are required (Note 1). The atmospheric corrosion resistance of this steel in most environments is substantially better than carbon steel with or without copper addition (Note 2). When properly exposed to the atmosphere,this steel can be used bare (unpainted) for many applications.When this steel is used in welded construction, the welding procedure shall be suitable for the steel and the intended service.This tubing is produced in welded sizes with a maximum periphery of 64 in. [1626 mm] and a maximum wall of 0.625 in. [15.9 mm], and in seamless with a maximum periphery of 32 in. [813 mm] and a maximum wall of 0.500 in. [12.7 mm]. Tubing having other dimensions may be furnished provided such tubing complies with all other requirements of this specification.
Chemical Properties
| Carbon, max | Manganese, max | Phosphorus, max | Sulfur, max | Copper |
|---|---|---|---|---|
| 0.24 | 1.40 | A | 0.06 | 0.18B |
Mechanical Properties
|
Tensile Strength, min, ksi (MPa) |
Yield Strength, 0.2 % Offset, min, ksi (MPa) |
Elongation in 2 in. (50.8 mm) or 4D, min, % |
|---|---|---|
| 70 000 [485] | 50 000 [345] | 19A |
