ASME SA790UNS32205 S31803 Duplex Steel Seamless Pipe Oil and gas refining,Chemical process plant Application
YUHONG we are one of the leading manufacturers of heat exchanger tube in China .With the development more than 35 years ,we have accumulatd a great much expeirence ,YUHONG products also exported to more than 85 countries .
ASTM A790 pipe is a special type of stainless steel pipe, whose micro structure is mainly composed of austenite and ferrite. The austenite phase provides good toughness, corrosion resistance, high strength and good processability, while the ferrite phase enhances the steel’s resistance to stress corrosion cracking, thermal conductivity and resistance to chloride stress corrosion cracking. Therefore, duplex stainless steel pipes usually have the characteristics of high strength, good corrosion resistance, excellent welding performance and high thermal conductivity.
S31803 and 2205 Duplex Pipe Chemical Composition:
| Grade |
C≤ |
Mn≤ |
P≤ |
S≤ |
Si≤ |
Ni |
Cr |
Mo |
N |
| S31803 |
0.03 |
2.00 |
0.03 |
0.02 |
1.00 |
4.5–6.5 |
21.0–23.0 |
2.5–3.5 |
0.08–0.20 |
| S32205 |
0.03 |
2.00 |
0.03 |
0.02 |
1.00 |
4.5–6.5 |
22.0–23.0 |
3.0–3.5 |
0.14–0.20 |
Duplex Steel S31803 and 2205 Pipe Mechanical Properties:
| Mechanical properties |
Tensile, min, ksi[MPa] |
Yield, min, ksi[MPa] |
Elongation, %(min) |
Hardness, HB(max) |
| S31803 |
90 [620] |
65 [450] |
25 |
290 |
| S32205 |
95 [655] |
65 [450] |
25 |
290 |
Duplex Corrosion Resistance
Excellent general corrosion resistance; superior to Grade 316 in most environments. Excellent resistance to localized corrosion including intergranular, pitting and crevice corrosion; the CPT of 2205 is generally at least 35ºC. The grade is also resistant to chloride stress corrosion cracking (SCC) at temperatures of up to about 150ºC. Grade 2205 will often perform well in environments which cause premature failure of austenitic grades. It has better resistance to sea water then Grade 316.
Duplex Heat Resistance
Although 2205 has good high temperature oxidation resistance, this grade - like other duplex stainless steels - suffers from embrittlement if held for even short times at temperatures above 300ºC. If embrittled, this can only be rectified by a full solution annealing treatment. Duplex stainless steels are almost never used above 300ºC.
Duplex Heat Treatment
Classification Society Criterion:CSS,DNV,GL,LR,NK,KR,ABS,BV
Solution treatment (annealing) - heat to 1020ºC-1100ºC and cool rapidly. This grade cannot be hardened by thermal treatment, but does work harden.
Some of the quality tests carried out by us includes
| Corrosion Test |
Conducted only when specially requested by the client |
| Chemical Analysis |
Test done as per required quality standards |
| Destructive / Mechanical Testing |
Tensile | Hardness | Flattening | Flare | Flange |
| Reverse-bend and Re. flat tests |
Carried out in full compliance with relevant standards & ASTM A-450 and A-530 norms, which ensures trouble-free expansion, welding & use at customers end |
| Eddy Current Testing |
Done to detect homogeneities in subsurface by using Digital Flaw-mark Testing System |
| Hydrostatic Testing |
100% Hydrostatic Testing carried out according to ASTM-A 450 norms for checking tube leakage, and biggest pressure we can support 20Mpa/7s . |
| Air Under Pressure Test |
To check any evidence of air leakage. |
| Visual Inspection |
After passivation, every single length of tubes & pipes is subjected to thorough visual inspection by trained staff for detecting surface flaws & other imperfections |
Supplementary Testing : Apart from the above mentioned tests, we also carry out on the manufactured products supplementary testing. The tests conducted under this include:
-
Eddy Current Testing
-
O.P Testing
-
Radiography Testing
|
-
Corrosion Testing
-
Micro Testing
-
Macro Testing
|
-
IGC Testing
-
Ultrasonic testing
-
Liquid Penetrate testing
-
|
Duplex Applications
Chemical processing, transport and storage,
Oil and Gas exploration and processing equipment,
Marine and other high chloride environments,
Pulp and paper digesters, liquor tanks and paper machines.
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