Line pipes for the oil and gas
December 15, 2017
ASTM A500 Structural Carbon Steel Cold-Formed Circular and Profiled Welded and Seamless Steel Pipe
December 16, 2017Outside Diameter: 12 ~ 70mm
Wall Thickness: 1 ~ 8mm
Length: 14000mm Max
A179 is the standard number, A – black metal, 179 is the order number
ASTM A179 “seamless cold drawn low carbon steel pipe for heat exchanger and condenser”
The A179 standard is also required for the surface smoothness of the steel pipe. A179 steel pipe is also required for the hardness of the finished products. Generally, some small steel pipe factories in China are not properly qualified due to the improper heat treatment process.
|
chemical composition( %) |
carbon |
manganese |
Phosphorus ≤ |
Sulfur ≤ |
|
0.06 ~ 0.18 |
0.27 ~ 0.63 |
0.035 |
0.035 |
|
Mechanical behavior |
Tensile strength (Mpa) |
Yield strength (Mpa) |
Elongation (%) |
hardness |
|
≧ 325 |
≧ 180 |
≧ 35 |
≤72HRB |
|
OD and wall thickness tolerances |
|||||
|
OD Inch (mm) |
+ |
– |
Wall thickness Inch (mm) |
+ |
– |
|
<1 (25.4) |
0.10 |
0.10 |
≦ 1 1/2 (38.1) |
20% |
0 |
|
1 ~ 1 1/2 (25.4 ~ 38.1) |
0.15 |
0.15 |
> 1 1/2 (38.1) |
twenty two% |
0 |
|
1 1/2 ~ 2 (38.1 ~ 50.8) |
0.20 |
0.20 |
|||
|
2 ~ 2 1/2 (50.8 ~ 63.5) |
0.25 |
0.25 |
|||
ASTM A179 cold drawn low carbon steel heat exchanger and condenser tube
Scope of application
1. This standard applies to the most thin-walled seamless steel pipes used in tube heat exchangers, condensers and similar heat transfer devices.
2. This standard is suitable for 3.2~76.2mm steel pipe.
2. General requirements
In addition to the provisions of this standard, the applicable provisions of ASTM A450 shall also be in accordance with the provisions of this standard
3. surface mass
No oxide iron, other surface quality according to ASTM A450.
The chemical composition of the 4. grade (%)
C: 0.06 ~ 0.18
Mn: 0.27 ~ 0.63
P: Less than or equal to 0.035
S: Less than or equal to 0.035
5. heat treatment
After the last cold drawing, the heat treatment is carried out at the temperature of less than 650 degrees C
6. hardness test
HRB 72, the requirements of sampling test for any two samples from each batch of steel pipe. (the so-called “batch” refers to the undivided steel tubes of the same diameter and wall thickness produced by the same furnace steel. If the number of the batch type furnace, only refers to the same furnace number, same size, same with steel tube heat treatment furnace; if continuous furnace batch should include the same furnace number, the same size and the same heat treatment furnace at the same temperature, the same time and the same heating stove the speed of all steel pipe heat treatment).
7. flatting test
Methods according to ASTM A450, samples were taken for each steel pipe or the remaining part to take two steel tubes for each sample. (a group of 250 pipes)
8. extender performance
Methods according to ASTM A450, samples were taken for each steel pipe or the remaining part to take two steel tubes for each sample. (a group of 250 pipes)
9. volume side performance
For S/D 10% steel pipe, it can be replaced by rearing. Methods according to ASTM A450, samples were taken for each steel pipe or the remaining part to take two steel tubes for each sample. (a group of 250 pipes)
10. water pressure test
Steel pipe by water pressure, if the Buyer agree to use nondestructive water pressure. The nondestructive test is based on ASTM A450.
