Products Description
ASTM A178/A178M specification covers standards for electric-resistance-welded tubes with minimum-wall-thickness made of carbon steel and carbon-manganese steel to be used in boiler tubes, boiler flues, superheater flues, and safe ends. The steel shall be of Grades A (low-carbon steel), C (medium-carbon steel), or D (carbon-manganese steel). All tubes shall be submitted to heat treatment after welding, followed by cooling. The steel shall conform to stated compositions of carbon, manganese, phosphorus, sulphur, and silicon. Grades C and D shall conform to given tensile requirements, that is tensile strength, yield strength, and elongation. The material shall also be subjected to flattening, flange, tension, reverse flattening, and hydrostatic (or nondestructive electric) tests. Crush test shall also be performed if asked by the purchaser. Minimum elongation values are also given.
The tubing sizes and thicknesses usually furnished to this specification are 1/2 to 5 in. [12.7 to 127 mm] in outside diameter and 0.035 to 0.360 in. [0.9 to 9.1 mm], inclusive, in minimum wall thickness. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this specification.
Chemical Composition of ASTM A178
|
Element % |
ASTM A178 Gr A / SA178A |
ASTM A178 Gr C / SA178C |
ASTM A178 Gr D / SA178D |
|
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 |
0.030 |
|
S |
0.035 |
0.035 |
0.015 |
|
Si |
... |
... |
0.10 Min. |
Mechanical Property of ASTM A178
|
Item |
ASTM A178 Gr A / SA178A |
ASTM A178 Gr C / SA178C |
ASTM A178 Gr D / SA178D |
|
Tensile strength, min, ksi [MPa] |
47[325] |
60[415] |
70[485] |
|
Yield strength, min, ksi [MPa] |
26[180] |
37[255] |
40[275] |
|
Elongation in 2 in. or 50mm, min, % |
35 |
30 |
30 |
|
For longitudinal strip tests a deduction for |
1.50A |
1.50A |
1.50A |
|
Each1⁄32-in[0.8mm] decrease in wall thickness below 5⁄16in. [8mm] |
|
|
|
|
From the basic minimum elongation of the following percentage points shall be made |
|
|
|
Outside diameter and Wall Thickness Tolerance of ASTM A178/A178M
|
Outside Diameter tol |
Wall thickness tol |
||
|
OD < 50 |
±0.05mm |
S < 4mm |
±12.5% |
|
OD > 50 |
±1% |
4--20mm |
+15/-12.5% |
|
S≧20mm |
±12.5% |
||
Products specification
Standard: Astm
Section Shape: Round
Place Of Origin: China
Application: Boiler Pipe
Production Process: Cold Drawn
Certification: Ce
Tolerance: ±10%
Category: Seamless Steel Pipe
OD: 6mm-168mm
WT: 1mm-12mm
Length: 0.5mtr-20mtr
Ends: Square Ends/Plain Ends (straight cut, saw cut, torch cut), Beveled/Threaded Ends
Packaging & Delivery
| Selling Units | : | Metric Ton |
| Package Type | : | Bundle or bulk , wooden case or other seaworthy packing or for the client's requirement |
GNEE ASTM A178 Boiler Steel tube for sale
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