ASTM A500 GRADE B 是一种美标请看下面的对应表
Specifications for ERW steel pipe---ASTM 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. |
25% 25% |
23% 19.5% |
21% 21% |
Outside Dimensions
|
Largest Outside Dimension |
Tolerance* |
|
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 Composition |
Twist |
|||
|
Chemical |
Grades A&B |
Grade C |
Largest Side |
Maximum Twist in 3 feet |
|
Carbon, 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 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 |
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|
JIS |
ASTM |
BS |
DIN |
NF |
ISO |
Index Number |
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|
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 |
A49-642 |
TS30.0 |
C |
C016 |
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|
(STK30) |
A5000 |
GrA |
C |
A49-643 |
TS30.0 |
C |
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|
A49-643 |
TS30a |
C |
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|
A49-644 |
TS30.0 |
C |
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|
A49-645 |
TS30.0 |
C |
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|
" |
TS30E |
C |
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|
" |
TS30ES |
C |
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|
STK400 |
C |
A252 |
Gr2 |
C |
6232 |
SAW |
C |
A49-643 |
TS37a |
C |
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|
(STK41) |
A500 |
GrB |
C |
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|
A501 |
- |
C |
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|
STK500 |
C |
6323 |
SAW |
C |
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|
(STK50) |
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|
STK490 |
C |
A49-643 |
TS47a |
C |
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|
(STK50) |
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|
STK540 |
C |
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(STK55) |
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