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ASTM A178/A178M
ASTM a178 / a178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes. ASTM a178 standard refers to electric-resistance-welded tubes with minimum-wall-thickness. Materials are carbon steel and carbon-manganese steel, ASTM a178 pipe and tube is to be used in boiler tubes, boiler flues, superheater flues and safe ends.
Outside diameter and Wall thickness tolerance
|
Outside Diameter tolerance |
Wall thickness tolerance |
||
|
OD < 50 |
±0.05mm |
S < 4mm |
±12.5% |
|
OD > 50 |
±1% |
4--20mm |
-120 |
|
|
|
S≧20mm |
±12.5% |
Chemical Requirements
|
Element |
Grade A |
Grade C |
Grade D |
|
% |
Low carbon steel |
Medium Carbon Steel |
Manganess Steel |
|
C |
0.06-0.18 |
0.35 Max |
0.27 Max |
|
Mn |
0.27-0.63 |
0.80 Max |
1.00-1.50 |
|
P |
0.035 |
0.035 |
0.03 |
|
S |
0.035 |
0.035 |
0.015 |
|
Si |
... |
... |
0.10 Min. |
Tensile Requirements
Grade C and D tubes shall conform to the requirements as to tensile properties
|
Data |
GradeC |
GradeD |
|
Tensilestrength,min,ksi[MPa] |
60[415] |
70[485] |
|
Yieldstrength,min,ksi[MPa] |
37[255] |
40[275] |
|
Elongationin2in.or50mm,min,% |
30 |
30 |
|
For longitudinal strip tests a deduction for Each1⁄32-in[0.8mm]decreaseinwallthicknessbelow5⁄16in.[8mm] |
1.50A |
1.50A |
The actual mean wall is defined as the average of the thickest and thinnest wall in that section.
Welded tubes 65 %
|
Type |
Over |
Under |
|
Welded Tubes |
0.18 |
0 |
Mechanical Property:
Grade C & Grade D tubes shall conform to the requirements -tensile properties prescribed below:
|
Type |
Over |
Under |
|
Welded Tubes |
0.18 |
0 |
Application Industries
A178 Boiler Pipes & Tubes are used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.Used in boiler, superheater, heat-exchanger and pressure equipment in Petrochemical factory, Refinery factory, sugar mill, power plant, power plant, shipbuilding.
150 meters southwest of the intersection of Heilongjiang Road and 105National Highway, Junwanghuang Village, Lepingpu Town, Chiping District,Liaocheng City, Shandong Province
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