ASTM A790 specifies the requirements for seamless and straight-seam welded ferritic/austenitic duplex stainless steel pipes designed for general corrosive environments. This standard places particular emphasis on resistance to stress corrosion cracking. The pipes must be produced either through seamless methods or automatic welding processes, without the addition of filler metal during welding. Heat analysis is conducted to determine the percentages of specified elements, and various tests—including tension, hardening, flattening, hydrostatic, and nondestructive electric tests—are performed to ensure compliance with the specified requirements.
ASTM A789 addresses stainless steel tubing with average wall thickness or, if specified in the order, minimum wall thickness, intended for applications that require general corrosion resistance. This standard also emphasizes resistance to stress corrosion cracking. It is important to note that these steels can become embrittled if used for extended periods at elevated temperatures.
Duplex Stainless Steel Pipe Specification
|
standard |
ASTM A789 |
ASTM A790 |
EN 10216-5 |
|||
|
grade |
s31803 s32205 s32750 |
s31803 s32205 s32750 |
1.4301 1.4307 1.4948 1.4315 |
|||
|
yield strength |
≥450；≥485；≥550 |
≥450；≥450；≥550 |
--- |
|||
|
tensile strength |
≥620；≥655；≥800 |
≥620；≥655；≥800 |
--- |
|||
|
elongation(%) |
≥25；≥25；≥15 |
≥25；≥25；≥15 |
--- |
|||
|
hydrostatic test |
the hydrostatic test shall be in accordance with astm a1016. could be replaced by ect. |
the hydrostatic test shall be in accordance with astm a999. could be replaced by ect. |
the hydrostatic test shall be carried out at a test pressure of 7mpa or |
|||
|
intergranular corrosion test |
usually use pitting corrosion test. |
usually use pitting corrosion test. |
en iso 3651-2 (optional) |
|||
|
eddy current test |
could be replaced by ht. |
could be replaced by ht. |
en 10246-3 |
|||
|
o.d. tolerance |
o.d. |
o.d.tolerance |
o.d. |
o.d.tolerance |
o.d. tolerance class |
|
|
d<12.7 |
+/-0.13 |
10.3≤d≤48.3 |
+0.40/-0.80 |
d3 |
+/-0.75% or |
|
|
12.7≤d<38.1 |
+/-0.13 |
48.3<d≤114.3 |
+0.80/-0.80 |
|||
|
whichever is the greater |
||||||
|
38.1≤d<88.9 |
+/-0.25 |
114.3<d≤219.1 |
+1.60/-0.80 |
d4 |
+/-0.5% or |
|
|
88.9≤d<139.7 |
+/-0.38 |
219.1<d≤457.0 |
+2.40/-0.80 |
|||
|
whichever is the greater |
||||||
|
w.t. tolerance |
o.d. |
w.t.tolerance |
o.d. |
w.t.tolerance |
w.t. tolerance class |
|
|
d<12.7 |
+/-15% |
10.3≤d≤73.0 |
+20.0%/-12.5% |
t3 |
+/-10% or |
|
|
12.7≤d<38.1 |
+/-10% |
|||||
|
88.9≤d≤457.0 |
+22.5%/-12.5% |
whichever is the greater |
||||
|
38.1≤d<88.9 |
+/-10% |
t4 |
+/-7.5% or |
|||
|
88.9≤d≤457.0 |
+15.0%/-12.5% |
|||||
|
88.9≤d<139.7 |
+/-10% |
|||||
|
whichever is the greater |
||||||
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
