ARK Stainless Inc is a trusted manufacturer, supplier and exporter of high-quality Stainless Steel Buttweld Fittings for industrial piping systems used in oil & gas, chemical processing, power generation, marine, pharmaceutical, food processing, and water treatment applications.
Our manufacturing range includes Stainless Steel Buttweld Elbows, SS Tees, SS Reducers, SS Caps, SS Stub Ends, and custom SS pipe fittings in seamless and welded construction according to ASME B16.9, MSS SP-43, and ASTM A403 standards.
We supply Stainless Steel Buttweld Pipe Fittings in SS 304, 304L, 304H, 309, 310, 310S, 316, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, and 904L grades for low-temperature, high-temperature, and corrosion-resistant piping applications.
These pipe fittings are manufactured with accurate dimensions, proper bevel preparation, and controlled wall thickness for reliable welding and long service life in process piping systems. Our fittings are widely supplied for refineries, offshore projects, EPC contractors, fabrication companies, and industrial process plants worldwide.
ARK Stainless Inc maintains ready stock of Stainless Steel Buttweld Fittings in multiple schedules and sizes for urgent project requirements and export supply. All fittings are supplied with material test certificates and inspection support as per customer requirements.
| C | Mn | Si | P | S | Cr | Mo | Ni | N | |
|---|---|---|---|---|---|---|---|---|---|
| 304 | 0.07max | 2.0max | 0.75max | 0.045max | 0.03max | min: 18.0 max: 20.0 | - | min: 8.0 max: 10.5 | — |
| 304L | 0.03max | 2.0max | 0.75max | 0.045max | 0.03max | min: 18.0 max: 20.0 | - | min: 8.0 max: 12.0 | 0.10 max |
| 304H | min: 18.0 max:20.0 |
min: 8.0 max: 10.5 |
min: 0.04 max:0.10 |
0.75 max |
2.0 max |
0.045 max |
- | 0.03 max |
0.10 max |
| 309 | 0.20 max | 2 max | 1 max | 0.045 max | 0.030 max | 23 max | - | 14 max | – |
| 310 | 0.25 max | 2 max | 1.50 max | 0.045 max | 0.03 max | 24 – 26 | - | 19 – 22 | – |
| 310S | 0.08 max | 2 max | 1.50 max | 0.045 max | 0.03 max | 24 – 26 | - | 19 – 22 | – |
| 316 | 0.08 max |
2.0 max |
0.75 max |
0.045 max |
0.03 max |
min: 16.0 max: 18.0 |
min: 2.0 max: 3.0 |
min: 10.0 max: 14.0 |
0.10 max |
| 316L | 0.03 max |
2.0 max |
0.75 max |
0.045 max |
0.03 max |
min: 16.0 max: 18.0 |
min: 2.0 max: 3.0 |
min: 10.0 max: 14.0 |
0.10 max |
| 316TI | - | - | - | - | - | 16.0 | 2.00 | 10.0 | - |
| 0.08 | 2 | 0.75 | 0.045 | 0.03 | 18.0 | 3.00 | 14.0 | 0.1 | |
| 317 | 0.08 max | 2 max | 1 max | 0.040 max | 0.03 max | 18 – 20 | 3 – 4 | 11 – 14 | - |
| 317L | 0.035 max | 2 max | 1 max | 0.040 max | 0.03 max | 18 – 20 | 3 – 4 | 11 – 15 | - |
| 321 | max:0.08 | max:2.0 | max:0.75 | max:0.045 | max:0.03 | min:17.0 max:19.0 |
– | min: 9.0 max:12.0 |
max:0.10 |
| 321H | min:0.04 max:0.10 |
max:2.0 | max:0.75 | max:0.045 | max:0.03 | min:17.0 max:19.0 |
– | min: 9.0 max:12.0 |
max:0.10 |
| 347 | 0.08 max | 2.0 max | 0.75 max | 0.04 max | 0.03 max | min: 17.0 max: 20.0 |
min:10x C max: 1.0 |
min: 9.0 max: 13.0 |
– |
| 347H | min: 0.04 max: 0.10 |
2.0 max | 0.75 max | 0.03 max | 0.03 max | min: 17.0 max: 20.0 |
min:10x C max: 1.0 |
min: 9.0 max: 13.0 |
– |
| 904L | 0.02 max | 4.0 – 5.0 | – | 0.045 max | 0.035 max | 19.0 – 23.0 | 23.0 – 28.0 | 2.0 max | – |
| 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) |
ARK Stainless Inc is a manufacturer, supplier and exporter of SS 304, 304L, and 304H Buttweld Fittings for corrosion-resistant piping systems used in chemical processing, food processing, pharmaceuticals, heat exchangers, water treatment, and industrial fabrication applications.
These Stainless Steel SS 304 Buttweld Fittings are supplied in SS 304 elbows, SS 304 L tees, SS 304H reducers, SS 304 caps, SS 304 stub ends, and custom configurations according to ASME B16.9 and ASTM A403 standards.
SS 304 Buttweld Fittings are widely used for general-purpose stainless steel piping applications due to their corrosion resistance, strength, and fabrication properties. SS 304L grades are preferred for welded piping systems requiring lower carbon content to reduce carbide precipitation during welding. SS 304H Buttweld Fittings are supplied for elevated temperature service applications where higher strength and heat resistance are required.
Our manufacturing range includes seamless and welded Stainless Steel 304,304H Pipe Fittings in multiple schedules, wall thicknesses, and sizes for industrial process piping systems.
SS 304 Pipe Fittings are commonly used where good corrosion resistance and general-purpose performance are required. They are widely specified for chemical processing equipment, food manufacturing, water lines and industrial process piping.
SS 304L Pipe Fittings have a lower carbon content than SS 304, which reduces the risk of intergranular corrosion in the heat-affected area after welding. This makes 304L a common choice for fabricated and welded piping systems where extensive welding is involved.
SS 304H Pipe Fittings have a higher controlled carbon content and are generally selected for elevated-temperature service where improved creep strength is required. Typical applications include furnace equipment, superheater systems and high-temperature process piping.
ARK Stainless Inc. can supply SS 304/304L/304H buttweld pipe fittings in different sizes, schedules and configurations according to piping specifications, drawings and project requirements.
SS 304L pipe fittings undergo inspection and testing according to the applicable material specification and customer requirements. Depending on the order, testing can include Positive Material Identification (PMI), hardness testing, chemical and mechanical analysis, micro and macro examination, flaring and flattening tests and other specified checks. Third-party inspection can also be arranged when required, with the relevant inspection reports supplied along with the order documentation.
Finished SS 304, 304L and 304H pipe fittings are packed according to the fitting type, quantity and mode of shipment. Large export consignments can be packed in wooden crates or on pallets, while smaller orders can be supplied in suitably protected boxes. Bevelled ends, threads and finished surfaces are protected during packing to avoid damage during sea or air freight.
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 304 | S30400 | 1.4301 | Z7CN18-09 | X5CrNi18-10 | SUS 304 | 304S31 | 08?18?10 |
| SS 304L | S30403 | 1.4306/1.4307 | Z3CN18-10 | X2CrNi18-9 / X2CrNi19-11 | SUS 304L | 304S11 | 03?18?11 |
| SS 304H | S30409 | 1.4301 | - | - | - | - | - |
ARK Stainless Inc manufactures, supplies and exports SS 309, SS 310, and SS 310S Buttweld Fittings for high-temperature and corrosion-resistant piping applications used in refineries, heat treatment plants, petrochemical industries, power generation, and industrial process systems.
These Stainless Steel 309, 310S Buttweld Fittings are supplied in elbows, tees, reducers, caps, stub ends, and custom configurations according to ASME B16.9 and ASTM A403 standards.
SS 309 Buttweld Fittings are widely used for applications requiring good oxidation resistance and strength at elevated temperatures. SS 310 Buttweld Fittings offer higher heat resistance and are commonly supplied for furnace components, thermal processing systems, and high-temperature piping lines. SS 310S is the low-carbon version of SS 310 and is preferred for welded applications requiring improved fabrication and reduced carbide precipitation.
Our manufacturing range includes seamless and welded Stainless Steel 309, 310S Pipe Fittings in multiple schedules, wall thicknesses, and custom sizes for industrial piping systems.
SS 309, 310 and 310S Buttweld Fittings are commonly used in piping systems exposed to elevated temperatures and oxidising conditions. The higher chromium and nickel content of these stainless steel grades provides good oxidation resistance and helps maintain strength during high-temperature service.
SS 310 and SS 310S Pipe Fittings are widely used in furnace equipment, heat treatment plants, thermal processing units, petrochemical facilities and other process piping applications involving elevated temperatures. SS 310S has a lower carbon content than SS 310, which helps reduce carbide precipitation during welding and makes it suitable for fabricated piping systems where welding is involved.
ARK Stainless Inc. manufactures SS 309/310/310S Buttweld Pipe Fittings in a wide range of sizes, schedules and configurations. The product range includes 90° and 45° elbows, long radius and short radius elbows, equal and reducing tees, concentric and eccentric reducers, crosses, pipe caps, stub ends and pipe bends for industrial piping requirements.
Fittings can be supplied according to applicable ASTM and ASME requirements, customer drawings and project specifications for both domestic and export orders.
SS 309, SS 310 and SS 310S Pipe Fittings undergo testing and inspection before dispatch according to the material specification and customer requirements. Testing can include PMI, hardness testing, flaring and flattening tests, radiography and pitting resistance testing, wherever applicable.
After inspection, finished SS 309/310/310S buttweld fittings are packed in wooden cases, pallets or cartons according to the size and quantity of the order. Bevelled ends and finished surfaces are properly protected during packing for safe handling and sea or air freight shipments.
| STANDARD | UNS | WNR. | AFNOR | EN | JIS | BS | GOST |
|---|---|---|---|---|---|---|---|
| SS 309 | S30900 | 1.4833 | - | - | - | - | - |
| SS 310 | S31000 | 1.4841 | - | X2CrNi18-9 / X2CrNi19-11 | SUS 310 | 310S24 | 20Ch25N20S2 |
| SS 310S | S31008 | 1.4845 | - | X8CrNi25-21 | SUS 310S | 310S16 | 20Ch23N18 |
ARK Stainless Inc. is a manufacturer, supplier and exporter of SS 316, SS 316L, SS 316H and SS 316Ti Buttweld Pipe Fittings for chemical processing, marine, petrochemical, power generation and other industrial piping applications. The range includes elbows, tees, reducers, crosses, caps, stub ends and pipe bends in different sizes, schedules and configurations to match piping specifications and project requirements.
SS 316 and SS 316L Pipe Fittings contain molybdenum, which gives these grades better resistance to pitting and crevice corrosion than conventional 304 stainless steel. SS 316L has a lower carbon content and is commonly selected for welded piping systems where resistance to intergranular corrosion after welding is important.
SS 316H Buttweld Fittings have a higher controlled carbon content and are generally used where improved strength at elevated temperatures is required. They are supplied for high-temperature process lines, pressure piping and other industrial applications operating under sustained heat.
SS 316Ti Pipe Fittings contain titanium for stabilisation against chromium carbide precipitation. This makes the grade useful for fabricated piping and equipment exposed to elevated service temperatures. SS 316Ti buttweld fittings are commonly used in heat exchangers, chemical processing equipment, pulp and paper plants, marine installations and high-temperature process piping.
SS 316 / 316L / 316Ti Buttweld Fittings are widely used in chemical processing, marine piping, offshore installations, pharmaceutical plants, and food-grade piping systems where higher corrosion resistance is required compared to standard stainless steel grades.
ARK Stainless Inc supplies Stainless Steel 316 Buttweld Elbows, SS 316 Tees, SS 316L Reducers, SS 316 Ti Caps, and SS 316 Stub Ends in seamless and welded construction according to ASME B16.9 and ASTM A403 specifications.
SS 316 grades are preferred for piping systems exposed to chlorides, moisture, and aggressive chemical environments. For welded process piping applications, SS 316L is commonly selected due to its lower carbon content, helping reduce carbide precipitation after welding. SS 316Ti contains titanium stabilization and is supplied for elevated temperature service where improved structural stability is required.
The SS 316 buttweld fittings are available in multiple schedules, wall thicknesses, and custom sizes for refinery projects, EPC contractors, fabrication companies, and industrial process plants.
ARK Stainless Inc. supplies ASTM A403 SS 316/316L/316H/316Ti buttweld fittings in standard and custom sizes according to applicable ASME requirements, customer drawings and project specifications.
SS 316, 316L, 316H and 316Ti Pipe Fittings undergo inspection and testing according to the applicable material specification and customer requirements. Testing can include Positive Material Identification (PMI), hardness testing, mechanical and chemical analysis, intergranular corrosion testing, flaring and flattening tests, and micro and macro examination, wherever applicable.
Third-party inspection and additional testing can also be arranged when required by the customer or project specification. Relevant test certificates and inspection documents can be supplied with the order.
Finished SS 316/316L/316H/316Ti buttweld fittings are packed according to their size, quantity and mode of transport. Wooden cases, pallets or protected cartons can be used for domestic and export shipments, with particular attention given to protecting bevelled ends and finished surfaces during handling and transportation.
ARK Stainless Inc. supplies these fittings for sea and air freight shipments and can arrange order identification, material traceability and project documentation as required.
| 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 | Z6CNDT17-123 | X6CrNiMoTi17-12-2 | SUS 316Ti | 320S31 | 08Ch17N13M2T |
ARK Stainless Inc. manufactures SS 317 and SS 317L Buttweld Pipe Fittings for piping systems used in chemical processing, petrochemical, pulp and paper, pharmaceutical and other corrosive service applications. The buttweld pipe fittings range includes 90° and 45° SS 317 elbows, SS 317L tees, SS 317L crosses, SS 317 concentric and eccentric reducers, SS 317 caps, stub ends and pipe bends in different sizes and schedules.
SS 317 and SS 317L Buttweld Pipe Fittings are supplied for piping systems requiring improved corrosion resistance in aggressive chemical and high-temperature service environments. These pipe fittings are widely used in chemical processing plants, fertilizer industries, pulp & paper mills, offshore installations, and industrial process piping systems.
ARK Stainless Inc is a manufacturer,supplier and exporter of SS 317 / 317L Buttweld Elbows, Tees, Reducers, Caps, and Stub Ends according to ASME B16.9 and ASTM A403 standards in seamless and welded construction.
SS 317 is a chromium-nickel-molybdenum stainless steel with higher molybdenum content than SS 316, giving it improved resistance to pitting and corrosion in many chemical environments. SS 317L is the low-carbon version of SS 317 and is commonly selected for welded piping systems where reducing the risk of intergranular corrosion after welding is important.
SS 317/317L Buttweld Fittings are commonly supplied for chemical handling lines, process piping, pulp and paper plants, food processing equipment and other installations exposed to corrosive process media. The appropriate grade, fitting type and wall thickness can be selected according to the operating conditions and piping specification.
The buttweld pipe fittings are available in multiple schedules, wall thicknesses, and custom sizes for refinery projects, fabrication companies, EPC contractors, and industrial process plants.
ARK Stainless Inc. supplies ASTM A403 SS 317/317L Buttweld Fittings in standard and custom sizes according to applicable ASME requirements, customer drawings and project specifications. Material Test Certificates, inspection documents and material traceability can also be provided as required.
SS 317 and SS 317L Pipe Fittings undergo inspection and testing before dispatch according to the applicable material specification and customer requirements. Testing can include PMI, hardness testing, ultrasonic testing, radiography, flaring and flattening tests, visual inspection and third-party inspection, wherever required.
After inspection, the finished SS 317/317L buttweld fittings are packed to protect bevelled ends, finished surfaces and material identification during handling and transportation. Wooden cases, pallets or protected cartons can be used depending on the fitting size, quantity and shipping method.
| STANDARD | UNS | WNR. | EN | JIS |
|---|---|---|---|---|
| SS 317 | S31700 | 1.4449 | - | SUS 317 |
| SS 317L | S31703 | 1.4438 | X2CrNiMo18-15-4 | SUS 317L |
ARK Stainless Inc. manufactures and supplies SS 321 and SS 321H Buttweld Pipe Fittings in India for high-temperature process piping and industrial applications where resistance to intergranular corrosion after welding is important. Our SS 321 / 321H Buttweld Fittings range includes SS 321/321H 45° and 90° elbows, buttweld tees, crosses, concentric and eccentric reducers, pipe caps, stub ends and pipe bends in different sizes and schedules.
SS 321 is a titanium-stabilised austenitic stainless steel containing chromium and nickel. The addition of titanium helps control chromium carbide precipitation during elevated-temperature service. This makes SS 321 Buttweld Fittings suitable for welded process piping, heat exchangers, furnace equipment and other systems exposed to repeated heating.
SS 321 and SS 321H Buttweld Fittings are supplied for high-temperature piping systems requiring improved resistance against intergranular corrosion after welding. These fittings are widely used in heat exchangers, thermal processing systems, refineries, power plants, and industrial process piping applications.
ARK Stainless Inc manufactures SS 321 / 321H Buttweld Elbows, Tees, Reducers, Caps, and Stub Ends according to ASME B16.9, ASME B16.28, MSS SP-43, and ASTM A403 standards.
SS 321 grades are stabilized with titanium for improved performance in elevated temperature service applications. SS 321H Buttweld Fittings are supplied for higher temperature environments requiring improved creep resistance and mechanical strength.
SS 321H is the higher-carbon version of SS 321 and is generally selected where additional strength and creep resistance are required at elevated temperatures. SS 321H Pipe Fittings for high-temperature applications are commonly supplied for process lines, power plants, heat treatment equipment, furnace components and other thermal systems.
Our manufacturing range includes seamless, welded, and fabricated Stainless Steel Buttweld Fittings in sizes from 1/8” NB to 48” NB with multiple schedules and wall thicknesses.
ARK Stainless Inc. supplies ASTM A403 SS 321/321H Buttweld Fittings in standard and custom sizes for domestic and export requirements. Fittings can be supplied according to applicable ASME standards, piping specifications, customer drawings and project requirements. Material Test Certificates (MTC), inspection documents and material traceability can also be provided when required.
All fittings are supplied with material test certificates, third-party inspection support, PMI testing, and radiographic testing as per customer and project requirements.
SS 321 and SS 321H Pipe Fittings undergo testing and inspection before dispatch according to the applicable material specification and customer requirements. Testing can include Positive Material Identification (PMI), hardness testing, ultrasonic testing, flaring and flattening tests, pitting resistance testing and hydrostatic testing, wherever applicable.
After inspection, finished SS 321/321H buttweld fittings are packed to protect bevelled ends, finished surfaces and material identification during handling and transportation. Wooden cases, pallets or protected cartons can be used depending on the fitting size, quantity and shipping method.
| STANDARD | UNS | WNR. | EN | JIS |
|---|---|---|---|---|
| SS 321 | S32100 | 1.4541 | X6CrNiTi18-10 | SUS 321 |
| SS 321H | S32109 | 1.4878 | X12CrNiTi18-9 | SUS 321H |
ARK Stainless Inc. manufactures and supplies SS 347 and SS 347H Buttweld Pipe Fittings for high-temperature process piping and applications where resistance to intergranular corrosion after welding is important. The range includes 45° and 90° elbows, tees, crosses, concentric and eccentric reducers, pipe caps, stub ends and pipe bends in different sizes and schedules.
SS 347 is a stabilised austenitic stainless steel commonly used for welded equipment and piping exposed to elevated temperatures. The grade offers good resistance to intergranular corrosion and is used in chemical processing plants, power generation, heat exchangers, aerospace equipment and high-temperature process lines.
SS 347H has a higher controlled carbon content than SS 347 and is generally selected where better creep strength and mechanical strength are required at elevated temperatures. SS 347H Buttweld Fittings are commonly specified for furnace piping, boiler systems, thermal processing equipment and other high-temperature industrial applications.
SS 347 and SS 347H Buttweld Fittings are supplied for high-temperature piping systems requiring improved resistance against intergranular corrosion and oxidation. These fittings are widely used in refineries, thermal processing plants, power generation units, chemical processing industries, and high-pressure process piping systems.
ARK Stainless Inc manufactures SS 347 / 347H Buttweld Elbows, Tees, Reducers, Caps, Stub Ends, and custom fittings according to ASTM A403, ASME SA403, ASME B16.9, ASME B16.28, and MSS SP-43 standards.
SS 347 grades are stabilized with niobium for improved performance in elevated temperature service applications and welded piping systems. SS 347H Buttweld Fittings are supplied for higher temperature environments requiring improved creep strength and long-term thermal stability.
Our manufacturing range includes seamless, welded, and fabricated Stainless Steel Pipe Fittings with bending radius options including 1D, 2D, 3D, 5D, and custom requirements as per project specifications.
ARK Stainless Inc. supplies ASTM A403 SS 347/347H Buttweld Fittings in standard and custom sizes according to applicable ASME requirements, piping specifications, customer drawings and project requirements. EN 10204 3.1/3.2 certificates, Material Test Certificates, third-party inspection and other inspection documents can be supplied when specified.
SS 347 and SS 347H Pipe Fittings undergo inspection and testing according to the applicable material specification and customer requirements. Testing can include Positive Material Identification (PMI), hardness testing, flaring and flattening tests, intergranular corrosion (IGC) testing, pitting resistance testing, chemical and mechanical analysis, and micro and macro examination, wherever applicable.
SS 347/347H buttweld fittings can be supplied with Material Test Certificates (MTC) as per EN 10204 3.1, along with material traceability records and other inspection documents. Third-party inspection and laboratory test reports can also be arranged when specified by the customer.
Depending on the project requirements, documentation can include raw material test reports, Quality Assurance Plan (QAP), packing list, material traceability records, inspection reports and other required quality documents.
| STANDARD | UNS | WNR. | EN | JIS | GOST |
|---|---|---|---|---|---|
| SS 347 | S34700 | 1.4550 | X6CrNiNb18-10 | SUS 347 | 08Ch18N12B |
| SS 347H | S34709 | 1.4961 | X6CrNiNb18-12 | SUS 347H | - |
SS 904L Buttweld Fittings can be supplied with the required material and inspection documentation. Depending on the order and project requirements, documents can include Material Test Certificates (MTC), raw material test reports, material traceability records, heat treatment charts, Quality Assurance Plan (QAP), packing lists and inspection reports.
ARK Stainless Inc. is a manufacturer and supplier of SS 904L Buttweld Pipe Fittings for chemical processing, petrochemical, marine and other industrial piping systems handling corrosive media. The range includes 45° and 90° elbows, long radius elbows, tees, crosses, concentric and eccentric reducers, pipe caps, stub ends and pipe bends in different sizes and schedules.
SS 904L (UNS N08904 / DIN 1.4539) is a low-carbon, high-alloy austenitic stainless steel containing nickel, chromium, molybdenum and copper. The copper content, together with the high nickel and molybdenum levels, gives 904L good resistance in a range of aggressive chemical environments. It is commonly selected for piping exposed to sulphuric acid and other corrosive process media.
SS 904L Buttweld Fittings are used in chemical processing plants, acid handling systems, pharmaceutical facilities, pulp and paper plants, seawater systems and other process piping applications where conventional stainless steel grades may not provide sufficient corrosion resistance.
SS 904L Buttweld Fittings are widely supplied for piping systems operating in highly corrosive environments where standard stainless steel grades are not suitable. These fittings are commonly used in chemical processing plants, offshore applications, seawater systems, fertilizer industries, and acid handling process lines.
ARK Stainless Inc manufactures SS 904L Buttweld Elbows, Tees, Reducers, Caps, and Stub Ends according to ASTM B366, ASME SB366, ASME B16.9, ASME B16.28, and MSS SP-43 standards.
The high nickel and molybdenum content of SS 904L provides improved resistance against pitting, crevice corrosion, and chloride exposure in aggressive process environments. These fittings are supplied in seamless, welded, and fabricated construction for industrial piping systems requiring long service life and corrosion resistance.
Available in sizes from 1/8” NB to 48” NB with multiple schedules, wall thicknesses, and custom project requirements.
ARK Stainless Inc. supplies ASTM A403 SS 904L Buttweld Fittings in standard and custom sizes according to applicable ASME requirements, piping specifications, customer drawings and project requirements. Material Test Certificates, material traceability and inspection documents can also be supplied when required.
SS 904L Pipe Fittings undergo testing and inspection according to the applicable material specification and customer requirements. Testing can include Positive Material Identification (PMI), hardness testing, flaring and flattening tests, pitting resistance testing and third-party inspection, wherever applicable.
After inspection, finished SS 904L buttweld fittings are packed to protect bevelled ends, finished surfaces and material identification during handling and transportation. Wooden cases, pallets or protected cartons can be used depending on the fitting size, quantity and shipping method.
| STANDARD | WERKSTOFF NR. | UNS | JIS | KS | BS | AFNOR | EN |
|---|---|---|---|---|---|---|---|
| SS 904L | 1.4539 | N08904 | SUS 904L | STS 317J5L | 904S13 | Z2 NCDU 25-20 | X1NiCrMoCu25-20-5 |
