ASTM A847 Cold-Formed Welded and Seamless High-Strength, Low-Alloy S...

ASTM A847 Cold-Formed Welded and Seamless High-Strength, Low-Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance

Designation: ASTM A 847
Standard Specification for
Cold-Formed Welded and Seamless High-Strength, Low-Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance

1. Scope
1.1 This specification covers cold-formed welded and seam-less high-strength, low-alloy round, square, rectangular, orspecial shaped structural tubing for welded, riveted, or boltedconstruction of bridges and buildings and for general structural purposes where high strength and enhanced atmospheric cor-rosion resistance are required. The atmosphericcorrosion resistance of this steel in most environments issubstantially better than carbon steel with or without copperaddition (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 weldingprocedure shall be suitable for the steel and the intendedservice.
1.2 This tubing is produced in welded sizes with a maxi-mum periphery of 64 in. (1626 mm) and a maximum wall of 0.625 in. (15.88 mm), and in seamless with a maximumperiphery of 32 in. (813 mm) and a maximum wall of 0.500 in.(12.70 mm). Tubing having other dimensions may be furnishedprovided such tubing complies with all other requirements of this specification.
1.3 The values stated in inch-pound units are to be regardedas the standard.

2. Referenced Documents
2.1 ASTM Standards:
A 370 Test Methods and Definitions for Mechanical Testingof Steel Products
A 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for Domestic Shipment
A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products
G 101 Guide For Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels

3. Ordering Information
3.1 Orders for material under this specification shouldinclude the following, as required, to describe the desiredmaterial adequately:
3.1.1 ASTM specification number,
3.1.2 Quantity (feet, metres, or number of lengths),
3.1.3 Name of material (cold-formed tubing),
3.1.4 Method of manufacture (welded or seamless),
3.1.5 Size (outside diameter and nominal wall thickness forround tubing and the outside dimensions and nominal wallthickness for square and rectangular tubing),
3.1.6 Length (specific or random, see 10.3),
3.1.7 End condition (see 14.2),
3.1.8 Burr removal (see 14.2),
3.1.9 Certification (see Section 17),
3.1.10 End use, and
3.1.11 Special requirements.

4. Process
4.1 The steel shall be made by one or more of the followingprocesses: open hearth, basic oxygen, or electric furnace.

5. Manufacture
5.1 The tubing shall be made by a welded or seamlessprocess.
5.2 Welded tubing shall be made from flat-rolled steel bythe electric-resistance welding or electric-fusion welding pro-cess. The longitudinal butt joint shall be welded across itsthickness in such a manner that the structural design strength of the tubing section is assured.
5.2.1 Structural tubing welded by the electric-resistancemethod is normally furnished without removal of inside flash.
5.3 The tubing may be stress relieved or annealed, as isconsidered necessary by the tubing manufacturer, to conformto the requirements of this specification.

6. Permissible Variations and Dimensions
Round Structural Tubing Outside diameter:
OD<50.8mm, tolerance≤±0.5%; OD≥50.8mm, tolerance≤±0.75%
Square and Rectangular Structural Tubing Dimension:
Dimension≤63.5mm:±0.51mm, >63.5-88.9mm:±0.64mm; >88.9-139.7mm: ±0.76mm; >139.7mm: ±1%OD
Wall thickness for all tubing: tolerance ≤ 10% Nominal Wall Thickness.

Keywords
Alloy Steel, Bolting, Bolting And Riveting, Cold-Formed Steel Tubes, Corrosion Resistance, Corrosive Service Applications, High-Strength Low-Alloy Steel, Hsla Steel, Riveted Construction, Riveting, Seamless Pipes And Tubes, Seamless Steel Tubes, Steel Tubes, Structural Steel, Tubular Products, Welded Pipes And Tubes, Welded Steel Tubes

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