| Material Grade:: | S32750， S31803， S32760 ， S31254， S32900， S32304 ， S31500 ， 2205 | NDT: | ET， UT， HT ， PT |
|---|---|---|---|
| Standard:: | A789， A790， A928 | ||
| High Light: | UNS S32750 Duplex Steel Pipe， ASTM A790 Duplex Steel Pipe， ASTM 790M Duplex Stainless Steel Pipes | ||
Duplex Stainless Steel Pipe， ASTM A790/790M UNS S32750 (1.4410)
TONG CHUANG SPECIAL STEEL deals 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， USA， 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.
Standards: ASTM/ASME A789/SA789， A790/SA790，A450，A530
Material: UNS S31803(Cr22Ni5Mo3/1.4462)/2205，UNS S32750(1.4410)，UNS S31500(Cr18NiMo3Si2)，
UNS32760(1.4501)
Chemical Composition
| Grade | C max | Si max | Mn max | P max | S max | Cr | Ni | Mo | N |
| UNS S32750 | 0.030 | 0.8 | 1.2 | 0.030 | 0.015 | 24.0-26.0 | 6.0-8.0 | 3.0-5.0 | 0.24-0.32 |
| UNS S31803 | 0.030 | 1.0 | 2.0 | 0.020 | 0.020 | 21.0-23.0 | 4.5-6.5 | 2.5-3.5 | 0.08-0.20 |
| UNS S31500 | 0.030 | 1.0 | 1.2-2.0 | 0.030 | 0.030 | 18.0-19.0 | 4.5-5.5 | 2.5-3.5 | 0.05-0.10 |
Physical Properties
| Grade | Y.S.MPa min | T.S.Mpa min | Elongation % | Hardness HRC |
| UNS S32750 | 550 | 800 | 15 | 20 |
| UNS S31803 | 450 | 620 | 25 | 20 |
| UNS S31500 | 440 | 630 | 30 | 20 |
Duplex Stainless Steel Pipe Application:
Chemical processing， Transport and Storage.
Oil and gas exploration and offshore rigs.
Oil and gas refining.
Marine environments.
Pollution control equipment.
Pulp and paper manufacturing
Chemical process Plant
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:
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