ARK Stainless Inc. is a leading manufacturer and supplier of premium quality Stainless Steel Flanges, known for their exceptional strength, precision, and performance in demanding industrial piping systems. Our flanges are designed to provide secure, leak-proof connections under high pressure and temperature conditions.
We manufacture flanges using a wide range of austenitic stainless steel grades including SS 304, 304L, 304H, 309, 310, 310S, 316, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, and 904L. These grades offer outstanding resistance to corrosion, oxidation, and high-temperature environments, making them suitable for a variety of industrial applications.
Our flanges are manufactured in accordance with international standards such as ASME B16.5, ASME B16.47, BS4504, EN-1092, DIN, and ANSI. We offer a comprehensive range including weld neck flanges, slip-on flanges, blind flanges, socket weld flanges, threaded flanges, lap joint flanges, and long weld neck flanges, in various pressure ratings and sizes.
Widely utilized in sectors like oil & gas, petrochemical, power generation, pharmaceuticals, food processing, shipbuilding, and wastewater treatment, our stainless steel flanges are appreciated for their dimensional accuracy, durability, and excellent mechanical properties. ARK Stainless Inc. ensures that every flange delivers dependable performance in critical service conditions.
| Grade | C | Mn | Si | P | S | Cr | Ni | Mo | N | Ti | Nb + Ta | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.07 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18.0–20.0 | 8.0–10.5 | – | – | – | – | Balance |
| 304L | 0.03 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18.0–20.0 | 8.0–12.0 | – | 0.10 max | – | – | Balance |
| 304H | 0.04–0.10 | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18.0–20.0 | 8.0–10.5 | – | 0.10 max | – | – | Balance |
| 309 | 0.20 max | 2.0 max | 1.0 max | 0.045 max | 0.03 max | 22–24 | 12–15 | – | – | – | – | Balance |
| 310 | 0.25 max | 2.0 max | 1.5 max | 0.045 max | 0.03 max | 24–26 | 8.0–12.0 | – | – | – | – | Balance |
| 310S | 0.08 max | 2.0 max | 1.5 max | 0.045 max | 0.03 max | 24–26 | 19–22 | – | – | – | – | Balance |
| 316 | 0.08 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | 0.10 max | – | – | Balance |
| 316L | 0.03 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | 0.10 max | – | – | Balance |
| 316Ti | 0.08 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 16.0–18.0 | 10.0–14.0 | 2.0–3.0 | 0.10 max | 5x(C+N)–0.70 | – | Balance |
| 317 | 0.08 max | 2.0 max | 1.0 max | 0.040 max | 0.03 max | 18.0–20.0 | 11.0–14.0 | 3.0–4.0 | – | – | – | Balance |
| 317L | 0.035 max | 2.0 max | 1.0 max | 0.040 max | 0.03 max | 18.0–20.0 | 11.0–15.0 | 3.0–4.0 | – | – | – | Balance |
| 321 | 0.08 max | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 17.0–19.0 | 9.0–12.0 | – | 0.10 max | 5x(C+N)–0.70 | – | Balance |
| 321H | 0.04–0.10 | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 17.0–19.0 | 9.0–12.0 | – | 0.10 max | 5x(C+N)–0.70 | – | Balance |
| 347 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.03 max | 17.0–19.0 | 9.0–13.0 | – | – | – | ≤1.0 | Balance |
| 347H | 0.04–0.10 | 2.0 max | 1.0 max | 0.045 max | 0.03 max | 17.0–19.0 | 9.0–13.0 | – | – | – | ≤1.0 | Balance |
| 904L | 0.02 max | 2.0 max | 1.0–2.0 | 0.045 max | 0.035 max | 19.0–23.0 | 23.0–28.0 | 4.0–5.0 | 1.0–2.0 | – | ≤2.0 | Balance |
| Grade | Tensile Strength (ksi / MPa) | Yield Strength 0.2% (ksi / MPa) | Elongation (%) | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
|---|---|---|---|---|---|
| 304 | 75 / 515 | 30 / 205 | 40 | 201 | 92 |
| 304L | 70 / 485 | 25 / 170 | 40 | 201 | 92 |
| 304H | 75 / 515 | 30 / 205 | 40 | 201 | 92 |
| 309 | 89.9 / 620 | 45 / 310 | 45 | – | – |
| 310 | 75 / 515 | 30 / 205 | 35 | – | – |
| 310S | 75 / 515 | 30 / 205 | 35 | – | – |
| 316 | 75 / 515 | 30 / 205 | 40 | 217 | 95 |
| 316L | 70 / 485 | 25 / 170 | 40 | 217 | 95 |
| 316Ti | 515 MPa | 205 MPa | 35 | 205 | 75 |
| 317 | 75 / 515 | 30 / 205 | 35 | – | – |
| 317L | 75 / 515 | 30 / 205 | 35 | – | – |
| 321 / 321H | 75 / 515 | 30 / 205 | 40 | 217 | – |
| 347 / 347H | 75 / 515 | 30 / 205 | 40 | 201 | 95 |
| 904L | 490 MPa | 220 MPa | 36 | 150 | 70–90 (typical) |
Stainless Steel 304/304L/304H Flanges exhibit a wide range of excellent features that make them highly suitable for demanding applications. These flanges are known for their superior weldability and formability, outstanding resistance to corrosion and oxidation due to the presence of chromium, and exceptional toughness. Their deep drawing ability, ease of fabrication, high strength, and hygienic properties also contribute to their widespread usage across various industries.
These flanges are extensively used in sectors such as railways, petrochemical industries, heat exchangers, pharmaceuticals, specialty chemicals, chemical processing, condensers, pulp and paper industries, fertilizers, construction projects, and infrastructure development.
To ensure the highest quality standards, SS 304/304L/304H Flanges are delivered along with essential documentation such as the heat treatment chart, Quality Assurance Plan (QAP), Mill Test Certificate (MTC), third-party inspection reports, and radiography test reports.
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 304 | S30400 | 1.4301 | Z7CN18‐09 | X5CrNi18-10 | SUS 304 | 304S31 | 08Х18Н10 |
| SS 304L | S30403 | 1.4306/1.4307 | Z3CN18‐10 | X2CrNi18-9 / X2CrNi19-11 | SUS 304L | 304S11 | 03Х18Н11 |
| SS 304H | S30409 | 1.4301 | - | - | - | - | - |
SS 309/310/310S Forged Fittings are known for their excellent properties such as high corrosion resistance, durability, ductility, weldability, hardness, toughness, endurance, and stability even at elevated temperatures. These fittings are precisely manufactured, ensuring an accurate dimensional tolerance and rust-resistant finish, which allows for excellent stress distribution. They can endure heavy temperature loads and offer a smooth transition in flange thickness. Additionally, they possess a high load-bearing capacity.
To ensure customer satisfaction, we supply premium quality SS 309/310/310S Forged Fittings that meet industry standards. These fittings undergo various rigorous tests such as positive material identification (PMI), large-scale tests, pitting protection tests, chemical analysis through spectrochemical methods, and mechanical testing like tensile strength, elongation, and reduction of area tests.
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 309 | S30900 | 1.4828 | - | - | SUS 309 | - | - |
| SS 310 | S31000 | 1.4841 / 1.4307 | - | X15CrNi25-20 | SUS 310 | 310S24 | 20Ch25N20S2 |
| SS 310S | S31008 | 1.4845 | - | - | SUS 310S | - | 20Ch23N18 |
The SS 316/316L/316Ti Forged Fittings offer a variety of beneficial properties due to the presence of alloying elements. These forged fittings exhibit excellent ductility, durability, stability at elevated temperatures, high toughness, tensile strength, and weldability. These attributes make SS 316/316L/316Ti forged fittings suitable for a wide range of industries, including pharmaceuticals, petrochemicals, oil and gas, pulp and paper, railways, and many others. The SS 316/316L/316Ti Forged Fittings undergo various material tests to ensure that the highest quality standards are met, providing our clients with reliable, durable products.
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 316 | S31600 | 1.4401 / 1.4436 | Z7CND17‐11‐02 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 | SUS 316 | 316S31 / 316S33 | - |
| SS 316L | S31603 | 1.4404 / 1.4435 | Z3CND17‐11‐02 / Z3CND18‐14‐03 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 | SUS 316L | 316S11 / 316S13 | 03Ch17N14M3 / 03Ch17N14M2 |
| SS 316Ti | S31635 | 1.4571 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 | SUS 316Ti | 904S13 | - |
The SS 317/317L Forged Fittings possess a variety of beneficial properties due to the presence of alloying elements. These include excellent corrosion resistance, pitting corrosion resistance, and many others. The combination of low and high carbon contents in the alloy enhances these qualities. Additional properties such as great ductility, durability, high tensile strength, stability at elevated temperatures, and toughness make these forged fittings ideal for various industrial applications.
The SS 317/317L Forged Fittings are manufactured according to national and international standards. To ensure the highest quality, we conduct rigorous testing and inspections, with third-party inspection teams involved. Documentation and test certificates are provided upon request, which include inspection reports, raw material test certificates, and 100% radiography test certificates. The final products are carefully packed in high-quality packaging materials to ensure safety during transit and are delivered to customers promptly. Delivery times may vary based on product availability.
| STANDARD | UNS | WNR. | JIS | EN |
|---|---|---|---|---|
| SS 317 | S31700 | 1.4449 | SUS 317 | - |
| SS 317L | S31703 | 1.4438 | SUS 317L | X2CrNiMo18-15-4 |
The SS 321 and 321H alloys are austenitic stainless steels that are specifically designed for high-temperature applications. As a result, the SS 321/321H Forged Fittings offer numerous properties which make them suitable for a wide range of industrial applications. These forged fittings are known for their excellent ductility, durability, high tensile strength, impressive toughness, and stability at elevated temperatures. Industries such as petrochemical, pharmaceuticals, oil and gas, pulp and paper, and many others rely on these forged fittings to ensure smooth operations in their applications. Due to the exceptional properties of SS 321/321H, these forged fittings are primarily used in aerospace applications, storage and equipment in food processing, waste treatment plants, as well as chemical and petrochemical processing. They are also widely utilized in gas processing, pharmaceuticals, heat exchangers, condensers, and the pulp and paper industry. The types of flanges we produce include spectacle blind flanges, SS socket weld flanges, SS weld neck flanges, and SS ring joint flanges. Additionally, we offer customization of SS 321/321H flanges to meet specific requirements. All the materials used are tested to ensure they are free of impurities. Each product is individually tested and inspected by our dedicated inspection team. Product documentation, test certifications, and packaging are provided as part of the process. The product packaging is done using durable materials such as poly bags and wooden boxes to prevent any scratches or damage during shipping. We ensure timely delivery of the product and provide certificates and documents to guarantee that the products are free from impurities and manufactured in accordance with industry standards.
| STANDARD | UNS | WNR. | JIS | EN |
|---|---|---|---|---|
| SS 321 | S32100 | 1.4541 | SUS 321 | X6CrNiTi18-10 |
| SS 321H | S32109 | 1.4878 | SUS 321H | X12CrNiTi18-9 |
SS 347/347H Forged Fittings are designed to deliver exceptional performance in harsh environments, ensuring no deformation even in challenging conditions. These fittings are especially suited for high-temperature applications due to their corrosion resistance. They are highly resistant to general corrosion types such as stress cracking, crevice corrosion, pitting, and impact corrosion.
These fittings undergo a range of rigorous tests, including flaring tests, mechanical tests, chemical analysis, hardness tests, macro and micro tests, flattening tests, and hydrostatic tests, ensuring their reliability and durability in various environments.
| STANDARD | UNS | WNR. | JIS | EN |
|---|---|---|---|---|
| SS 347 | S34700 | 1.4550 | SUS 347 | X6CrNiNb18-10 |
| SS 347H | S34709 | 1.4961 | SUS 347H | X6CrNiNb18-12 |
SS 904L Forged Fittings are highly suitable for various general applications across a range of industries. These fittings are commonly used in sectors like water supply systems, offshore oil drilling, gas processing, food processing, plumbing, specialty chemical industries, heat exchangers, condensers, the paper industry, fertilizer manufacturing, pulp industries, petrochemical industries, chemical equipment, pharmaceutical industries, seawater equipment, and the cement industry.
| STANDARD | UNS | WNR. | JIS | BS | KS | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 904L | N08904 | 1.4539 | SUS 904L | 904S13 | STS 317J5L | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 |
