Specifications for ERW steel pipe---ASTM A500All our structural tubes are produced in accordance with the mechanical and chemical property requirements of ASTM specification A500, Grade A, B, C.

Mechanical Properties

PropertiesGrade A Grade B Grade C

Tensile Strength, min. psi 45,000 (310Mpa) 58,000 (400Mpa) 62,000 (427Mpa)Yield Strength, min. psi 39,000 (269Mpa) 46,000 (317Mpa) 50,000 (345Mpa)Elongation in 2” min. 3/16” wall & heavier1/8” wall

25%

25%

23%

19.5%

21%

21%

Outside Dimensions

Largest Outside DimensionTolerance*

2-1/2” and under ±0.020”Over 2-1/2” to 3-1/2” inclusive ±0.025”Over 3-1/2” to 5-1/2” inclusive ±0.030”Over 5-1/2” ±1%

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

Chemical CompositionTwist

Chemical Grades A&B Grade C Largest Side Maximum Twist in 3 feetCarbon, max. % 0.26 0.23 Over 1-1/2” to 2-1/2” inclusive .062”Manganese, max. % --- 1.35 Over 2-1/2” to 4” inclusive .075”Phosphorus, max. % 0.04 0.04 Over 4” to 6” inclusive .087”Sulphur, max. % 0.05 0.05 Over 6” to 8” inclusive .100”

Cooper, when cooper steel is specified min. % 0.20 0.20 Over 8” .112”Straightness: .025” times the number of feet of total lengthSquareness of Sides: Deviation from 90ce by +/-2ce max.

Radius of Corners: The radius of any outside corner shall not exceed three times the specified wall thickness.

Wall thickness: +/-10% of nominal wall thickness, as measured at the center of the flat.

Remarks: a).1’ = 0.3048m, 1” = 25.4mm

b).1PSI = 0.00689Mpa

JIS Number and Corrensponding Foreign Standards

JIS ASTM BS DIN NF ISO

Index Numb

er

Standard

Number

Grade Tupe

Standard

Number

Grade

Tupe

Standard

Number

Grade

Tupe

Standard

Number

Grade

Tupe

Standard

Number

Grade Tupe

Standard

Number

Grade

Tupe

G3444 STK290 C A252 Gr1 C A49-

642TS30.

0 C C016

(STK30) A5000 GrA C A49-

643TS30.

0 C

A49-643 TS30a C

A49-644

TS30.0 C

A49-645

TS30.0 C

" TS30E C

" TS30ES C

STK400 C A252 Gr2 C 6232 SAW C A49-

643 TS37a C

(STK41) A500 GrB C

A501 - CSTK50

0 C 6323 SAW C

(STK50)

STK490 C A49-

643 TS47a C

(STK50)

STK540 C

(STK55)