ASTM A847 Atmospheric Corrosion Resisting Square Tube

ASTM A847 square tubes are high-strength, low-alloy structural tubes designed for superior atmospheric corrosion resistance, forming a protective rust patina that eliminates the need for painting in most outdoor applications. These weather-resistant steel tubes offer excellent durability and structural performance for architectural, bridge, and industrial applications exposed to harsh environments.

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Description

1. Material Overview
ASTM A847 square tubes are high-strength, low-alloy structural hollow sections manufactured from weather-resistant steel. These tubes develop a protective oxide layer (patina) when exposed to atmospheric conditions, providing superior corrosion resistance compared to conventional carbon steel while maintaining excellent structural performance.

Chemical Composition

Element	Content Range	Function
C	≤0.22%	Enhances weldability
Cu	0.20-0.40%	Improves corrosion resistance
Cr	0.30-1.25%	Stabilizes protective patina
P	≤0.04%	Contributes to weathering
Si	0.15-0.50%	Increases strength

Mechanical Properties

Yield Strength: ≥50 ksi (345 MPa)

Tensile Strength: ≥70 ksi (483 MPa)

Elongation: ≥21% in 8"

Hardness: ≤200 HB

Charpy V-Notch Impact: ≥20 ft-lb at -10°F

Standard Sizes & Dimensions

Outside Dimension Range	Wall Thickness	Standard Lengths
1"×1" to 12"×12"	0.125" to 1.0"	20' or 40'
(25×25mm to 300×300mm)	(3-25mm)	(6-12m)

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