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ASTM A500 / ASME SA500 / Cold Formed Welded and Seamless Carbon Steel Structural Tubing Square, Rectangular pipe supplier & distributor in India


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1. Scope

1.1 This specification covers cold-formed welded and seamless carbon steel round, square, rectangular, or special shape structural tubing for welded, riveted, or bolted conshape structural tubing for welded, riveted, or bolted construction of bridges and buildings, and for general structural purposes. 

1.2 This tubing is produced in both welded and seamless seizes with a maximum periphery of 64in.(1626 mm) and a maximum wall of 0.625 in.(15.88 mm). Grade Drequires heat treatment. Note 1 - Products manufactured to this specificationmay not be suitable for those applications such as dymanically loaded elements in welded structures, etc, where low-temperature notch-toughness properties may be important. 

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

Grade Remaks (Similar to JIS)
Gr. A (STK290)
Gr. B (STK400)
Gr. C -

Element composition, %
Grades A, B and D Grade C
Heat Analysis productAnalysis Heat Analysis productAnalysis
Carbon, max 0.26 0..30 0.23 0.27
Manganese, max 1.35 1.40
Phosphorus, max 0.035 0.045 0.035 0.45
Sulfur, max 0.035 0.045 0.035 0.045
Copper, When copper steel is specified, min 0.20 0.18 0.20 0.18

  Tensile Requirements

Round Structural
  GradeA GradeB GradeC GradeD
Tensile strengh, min, psi (MPa) 45000(310) 58000(400) 62000(427) 58000(400)
Yeild strength, min, psi(MPa) 33000(228) 42000(290) 46000(317) 36000(250)
A Elongation in 2 in.(50.8mm),
min, %
B 25 C 23 D 21 C 23


The minimum Elongation values Specified apply only to testing performed prior to shipment because of the possibility of strain aging. Test perfomed after shipment may show values below those stated
Applies to specified wall thicknesses 0.120 in.(3.05mm) and over. For wall thicknesses under 0.120 in., the minimum elongation shall be calculated by the formula: percent elongation in. 2 in.=56t + 17.5.
Applies to specified wall thicknesses 0.180 in. (5.57mm) and over. For wall thicknesses under 0.108 in,. The minimum elongation shall be calculated by the formula: percent elongation in 2 in.=61t+12
Applies to specfied wall thicknesses 0.120 in. (3.05mm) and over. For lighter wall thicknesses, elongation shall be by agreement with the manufature. 

Note-The following table gives calculated minimum value for longitudinal strip tests:  

Wall thickness, in. (mm) Elongation in 2 in. (50.8mm), min %
Grade A Grade B
0.180(4.57) 23
0.165(4.19) 22
0.148(3.76) 21
0.134(3.40) 20
0.120(3.05) 25 19.5
0.109(2.77) 23.5 19
0.095(2.41) 23 18
0.083(2.11) 22 17
0.065(1.65) 21 16
0.049(1.24) 23 15
0.035(0.89) 19.5 14


  Outside Dimension Tolerances for Square and Rectangular Structural Tubing 

Outside Larger Flat Dimension, in (mm) A Lager Flat dimension Tolerance, pluse and minus, in (mm)
2½(63.5) or under 0.020 (0.51)
Over 2½ to 3½(63.5 to 99.9), incl 0.025 (0.64)
Over 3½ to 5½ (88.9 to 139.7), oncl 0.030 (0.76)
Over 5½ (139.7) 0.01 times lager flat dimension


Tolerances include allowance for convexity or concavity. For rectangular tubing having a ratio of outside larger to small flat dimesion less than 1.5, and for square tubing, the tolerance on small falt dimension shall be identical to the lager flat dimension in the range of 1.5 to 3.0 inclusive, the tolerance on small flat dimentsion shall be 1.5 times the lager flat dimension tolerance. For rectangular tubing having a ratio of outside lager to small flat dimension greater than 3.0 the tolerance on small flat dimension shall be 2.0 times the large flat dimension tolerance.

TABLE 4 Specified Mill Length Tolerances for Structural Tubing

  22 ft(6.7mm) and Under Over 22 to 44 ft (6.7 to 13.4m), incl
Over Under Over Under
Length tolerance for specified mill length in. (mm) ½(12.7) ¼(6.4) ¾(19.0) ¼(6.4)

  Twist Tolerances for Square and Rectangulr 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
1½(38.1) and under 0.050 1.39
Over 1½ to 2½ (38.1 to 63.5), incl 0.062 1.72
Over 2 to 4 (63.5 to 101.6), incl 0.075 3.09
Over 4 to 6 (101.6 to 152.4),incl 0.087 2.42
Over 6 to 8 (152.4 to 203.2), incl 0.100 2.78
Over 8 (203) 0.112 3.11

In case of failure on retest to meet the requirements of Section 8 and 9, the manufacturer may elect to
retreat, rework, or otherwise eliminate the condition responsible for failure to otherwise eliminate the 
condition responsible for failure to meet the specified requriements of this specification.

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