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ASTM A847 / ASME SA847 / Cold Formed Welded and Seamless High Strength Low Alloy Structural Tubing supplier & distributor in India

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ASTM A 847-79 / ASME SA 847 

COLD FORMED WELDED AND SEAMLESS HIGH STRENGTH LOW ALLOY STRUCTURAL TUBING WITH IMPROVED ATMOSPHERIC CORROSION RESISTANCE

This standard is issued under the fixed designation A 847; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon ( ε) indicates an editorial change since the last revision or reapproval.



1. Scope


1.1 This specification covers cold-formed welded and seamless high-strenght, 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 atmo-spheric corrosion resistance are required (Note 1). The atmospheric corrosion resistance of this steel in most envi-ronments 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.

1.2 This tubing is produced in welded sizes with a maximum prriphery of 64 in. (1626 mm) and a maximum wall of 0.625 in. (15.88mm), and in seamless with a maximum periphery of 32 in. (813 mm) and a maximum wall of 0.500 in. (12.70mm). Tubing having other dimen-sions may be furnished provided such tubing complies with all other requirements of this specification.

1.3 The values stated in inch-pound units are to be regarded as the standard.

NOTE 1-Products manufactured to this specification may not be suitable for those applications where low temperature notch toughness properties may be important, such as dynamically loaded elements in welded stuctures, etc.

NOTE 2-For methods of estimating the atmospheric corrosion resistance fo low alloy steels see Guide G 101 or actual data.




Chemical composition

Grade Mfg. Process Chemical composition(%)
C Si Mn P S Ni Cr Mo Others
- Wor S 0.40Max - 1.35Max 0.015Max 0.05Max - - - Cu 0.20Min




Mechanical Properties 

Grade   Tensile Test MPa or N/mm2 Remaks (Similar to JIS) Possibility Temperature
Min Yield point Tensile Strength
- 345 483Min -




TABLE 1 Chemical Requirements 

Elements Heat Analysis Product Analysis
Carbon, max 0.20 0.24
Manganese, max 1.35 1.40
Phosphorus, max 0.15 A
Sulphur, max 0.05 0.06
Copper, min 0.20B 0.18B


ABecause of the degree to which phosphorus segregates, roduct analysis for this element is not technologically appropriate for rephosphorized steels unless misapplication is clearly indicated. BIf chromium and silicon contents are each 0.50 minimum, 
then the copper minums do not apply.   


TABLE 2 Tensile Requirements for Round and Shaped Tubing 

Tensile strength, min, psi (MPa) 70 000(483)
Yield strength, min, psi (MPa) 50 000(345)
Elongation in 2 in. (50.8mm) min,% 19A



AApplies to specified wall thicknesses 0.120 in. (3.05mm) and over. For lighter wall thicknesses, 
elongation shall be by agreement with the manufacturer.


TABLE 3 Specified Mill Length 

  Tolerances for Structural Tubing
22 ft(6.7m) and under Over 22 ft(6.7m)
Over Under Over Under
Length tolerance
for specified mill
length, in.(mm)		 1/2
(12.7) 		 1/4
(6.4) 		 3/4
(19.0) 
1/4
(6.4)




 TABLE 4 Outside Dimension Tolerances for Square and Rectangular Tubing 

Largest outside dimension
acroos flats, in. (mm)		 Tolerance, ±in. (mm)A
2 1/2(63.5) AND UNDER 0.020(0.51)
Over 2 1/2 to 3 1/2(63.5 to 88.9), incl 0.025(0.64)
Over 3 1/2 to 5 1/2 (88.9 to 139.7), incl 0.030(0.76)
Over 5 1/2(139.7) 1%


ATolerances include allowance for convexity or concavity. For rectangular sections, the tolerance calculated for
the larger flat dimension shall also apply to the smaller flat dimension. 
This tolerance may be increased 50% when applied to the smaller dimension if the ratio of the extemal sides 
is in the range of 1.5 to 3, inclusive; the tolerance may be increased 100% when the ratio exceeds 3.   



TABLE 5 Twist Toerances for Square and Rectangular Structural Tubing 

Specified dimension of longest side, in.(mm) Maximum twist in the first 3 ft (1m) and in each additional 3 ft
in. mm
1 1/2(38.1) and under 0.050 1.39
Over 1 1/2 to 2 1/2(38.1 to 63.5), incl Over 2 1/2 to 4(63.5 to 101.6), incl 0.062 1.72
Over 4 to 6(101.6 to 152.4), incl 0.075 2.09
Over 6 to 8(152.4 to 203.2), incl 0.087 2.42
Over 6 to 0.100 2.78
  0.112 3.11

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