ARK Stainless Inc. is a prominent manufacturer and exporter of premium quality Duplex & Super Duplex Stainless Steel Buttweld Fittings, engineered for critical applications in aggressive environments. Manufactured using advanced technology and top-grade raw materials, our fittings are known for their high strength, excellent corrosion resistance, and superior performance in chloride-rich and high-pressure conditions.
We offer Duplex grades like UNS S31803 and S32205, and Super Duplex grades such as UNS S32750 and S32760. These are manufactured in compliance with international standards like ASTM A815 / ASME SA815 and dimensional standards including ASME B16.9, B16.28, and MSS-SP-43. These fittings are available in Seamless, Welded, and Fabricated types to suit varied application needs.
The dual-phase microstructure of Duplex and Super Duplex Stainless Steel offers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking. These fittings are ideal for use in industries such as oil & gas, desalination, marine, chemical processing, and offshore platforms, where high strength and corrosion resistance are essential.
At ARK Stainless Inc., each buttweld fitting undergoes strict quality checks, ensuring precise dimensions, flawless finish, and long-lasting service even in the harshest operating environments.
| Grade | Common Name | C% | Mn% | Si% | P% | S% | Cr% | Ni% | Mo% | N% | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2205 | S31803 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | 0.08–0.20 | - |
| S32205 | 0.030 | 2.00 | 1.00 | 0.030 | 0.020 | 22.0–23.0 | 4.5–6.5 | 3.0–3.5 | 0.14–0.20 | - | |
| Super Duplex | S32750 / S32760 | 0.020 | - | - | - | 0.001 | 25 | 7 | 4.0 | 0.27 | - |
| Property | Duplex Steel (S31803/S32205) | Super Duplex Steel (S32750/S32760) |
|---|---|---|
| Tensile Strength | 90 ksi min | 116 ksi min |
| Yield Strength (0.2% Offset) | 65 ksi min | 80 ksi min |
| Yield Strength (0.1% Offset) | - | 91 ksi min |
| Elongation (%) | 25% min | 15% min |
| Hardness | HRC 293 max | Rockwell C 32 max |
| Impact Energy | - | 74 ft.-lbs. min |
Duplex Steel Buttweld Fittings are used in various industries for their different applications such as power generation, gas processing, seawater equipment, heat exchangers, chemical equipment, pulp and paper industry, pharmaceutical equipment, oil-shore oil drilling industry, and many more.
We ensure that all the material goes through material testing for different quality inspections. The tests we carry out on these butt-weld fittings are hardness test, mechanical test, PMI testing, chemical test, flattening test, micro test, macro test, IGC test, etc. We offer all the test certificates to our esteemed patron including raw material certificate and 100% radiography report.
| STANDARD | UNS | WNR. |
|---|---|---|
| Duplex Steel 2205 | S31803 / S32205 | 1.4462 |
There are several industries in which Super Duplex Steel Buttweld Fittings are used for various applications. It is like Power Generation plants, Heat Exchangers, Pharmaceuticals, Automotive industry, Gas Processing, Off-Shore Oil Drilling Industries, Petrochemicals, Sea Water Equipment, Pulp and Paper Industry, Chemical Equipment, and so on.
We offer several test certificates with these buttweld fitting such as 100% radiography test report, raw material certificate, and other third-party inspection certificates. We perform material testing on these products with several testing methods such as PMI testing, hardness test, chemical test, micro & macro test, flattening test, etc.
| STANDARD | UNS | WNR. |
|---|---|---|
| Super Duplex Steel 2507 | S32760 / S32750 | 1.4410 |
