
Specifications for ERW steel pipeASTM A500
All our structural tubes are produced in accordance with the mechanical and chemical property requirements of ASTM specification A500, Grade A, B, C.
Mechanical Properties
Properties 
Grade 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 & heavier
1/8¡± wall 
25%
25% 
23%
19.5% 
21%
21% 
Outside Dimensions
Largest Outside Dimension 
Tolerance* 
21/2¡± and under 
¡À0.020¡± 
Over 21/2¡± to 31/2¡± inclusive 
¡À0.025¡± 
Over 31/2¡± to 51/2¡± inclusive 
¡À0.030¡± 
Over 51/2¡± 
¡À1% 
*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 Composition 
Twist 
Chemical 
Grades A&B 
Grade C 
Largest Side 
Maximum Twist in 3 feet 
Carbon, max. % 
0.26 
0.23 
Over 11/2¡± to 21/2¡± inclusive 
.062¡± 
Manganese, max. % 
 
1.35 
Over 21/2¡± 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 length
Squareness 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 Number 
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 






A49642 
TS30.0 
C 



C016 

(STK30) 

A5000 
GrA 
C 






A49643 
TS30.0 
C 
















A49643 
TS30a 
C 
















A49644 
TS30.0 
C 
















A49645 
TS30.0 
C 
















" 
TS30E 
C 
















" 
TS30ES 
C 





STK400 
C 
A252 
Gr2 
C 
6232 
SAW 
C 



A49643 
TS37a 
C 





(STK41) 

A500 
GrB 
C 
















A501 
 
C 














STK500 
C 



6323 
SAW 
C 











(STK50) 


















STK490 
C 









A49643 
TS47a 
C 





(STK50) 


















STK540 
C 

















(STK55) 


















