Duplex Stainless Steel Pipes, ASTM A789, ASTM A790, S31803, S32750,
S32205, S31254MO.
YUHONG SPECIAL STEEL deal with Austenitic Stainless Steel, Nickel Alloy Steel(Hastelloy
, Monel, Inconel, Incoloy ) seamless and welded pipe and tube
already more than 25 years, every year sell more than 80000 tons of
steel pipe and tube. Our client already cover more than 45
countries, Like Italy, UK, Gernmany, Canada, Chile, Colombia, Saudi
Arabia, Korea, Singapore, Austrial, Poland, France , ....And our group branch company and factory have been already approved by :ABS, DNV, GL, BV, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS,
CNNC, ISO9001-2008, ISO 14001-2004.
Duplex Stainless Steel
UNS S31803 - UNS S32205
Duplex Plate/Sheet
Duplex Seamless & Welded Tube
Duplex Seamless & Welded Pipe
Duplex Round Bar
Duplex Flanges F51
Duplex Specialty Forgings
Duplex Seamless & Welded BW Fittings
| Trade Name | UNS | Duplex Stainless Steel Industry Specifications | Chemical Composition | Min.Tensile
(KSI) | Min.Yield
(KSI) | Elongation
% |
2205®
22Cr | UNS S31803 | ASME SA-182 (F51), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F51),A240, A276, A479, A789, A790, A815, A928, A988
SAE J405 | C 0.30 max
Cr 21.0-23.0
Mn 2.00 max
Mo 2.50-3.50
N 0.08-0.20
Ni 4.50-6.50
P 0.030 max
S 0.020 max
Si 1.00 max | 90 | 65 | 25 |
2205®
22Cr | UNS S32205 | ASME SA-182 (F60), SA-240, SA-798, SA-790, SA-815
ASTM A182 (F60), A240, A276, A479, A480, A798, A790, A815, A928, A988
SAE J405 | C 0.30 max
Cr 22.0-23.0
Mn 2.00 max
Mo 3.00-3.50
N 0.14-0.20
Ni 4.50-6.50
P 0.030 max
S 0.020 max
Si 1.00 max | 95 | 65 |
25
|
General Duplex stainless steel information
2205 is the most widely used duplex (ferritic/austenitic) stainless
steel grade. It finds applications due to both excellent corrosion
resistance and high strength. The standard duplex S31803
composition has over the years been refined by many steel
suppliers, and the resulting restricted composition range was
endorsed as UNS S32205 in 1996. Duplex S32205 gives better
guaranteed corrosion resistance, but for much of the Duplex S31803
currently produced also complies with Duplex S32205. 2205 is not
generally suitable for use at temperatures above 300ºC as it
suffers from precipitation of brittle micro-constituents, nor below
-50ºC because of its ductile-to-brittle-transition.
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.
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
|
