ARK Stainless Inc. is a reputed manufacturer and supplier of top-grade Stainless Steel Forged Fittings, offering superior mechanical performance and reliability in high-pressure and high-temperature piping systems. Designed for exceptional durability and resistance, our forged fittings are precision-engineered to deliver a tight, leak-proof connection in critical industrial applications.
Manufactured using high-quality austenitic stainless steels like 304, 304L, 304H, 316, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, and 904L, our forged fittings offer excellent resistance to corrosion, oxidation, and high temperatures. They comply with international standards such as ASME B16.11, MSS SP-79, MSS SP-83, MSS SP-95, MSS SP-97, and BS3799.
These fittings are produced through the forging process, ensuring accurate dimensions, improved mechanical properties, and a robust structure. Our range includes socket weld elbows, tees, couplings, unions, bushings, caps, crosses, and forged nipples, available in both socket weld and threaded types.
The forged fittings offered by ARK Stainless Inc. are widely used across industries such as oil & gas, power generation, petrochemicals, refineries, shipbuilding, and water treatment. With high tensile strength, excellent workability, and a long service life, our products are trusted for their quality and consistent performance.
| 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) |
There is a wide range of applications where these forged fittings are used. These forged fittings show excellent performance and very large applications. These fittings are used in that area where high strength and tolerance are required. SS 304/304L/304H forged fittings are commonly used in various industries like petrochemical industry, oil and gas industry, power generation plants, bulk liquid transportation. They are also used in chemicals, pharmaceuticals, pulp industry and paper manufacturing, textiles, and so many other industries.
The application where it is found used is railways, petrochemical industry, heat exchangers, pharmaceuticals, specialty chemicals, chemical industry, condensers, pulp & paper industry, fertilizers, constructions, buildings, etc.
| 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 good at having many properties like corrosion resistance, durability, ductility, weld ability, Hardness, high toughness, high endurance, and stability in the elevated temperatures. They are of accurate dimensions, rustproof finish, ensures excellent stress distribution. They can sustain heavy temperature load and also have a smooth transition from flange thickness. They also have a high load-bearing capacity.
For ensuring our customer satisfaction through our products we provide premium quality and standard products to them. For this SS 309/310/310S Forged Fittings undergo various tests like positive material recognition test, large scale test, prompt test, pitting protection test, chemical examination-spectro analysis test, mechanical examination like tensile, elongation and reduction of area test, etc.
| 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 is having many characteristics with the presence of the alloying elements. Some of the properties which are there in the forged fittings are great ductility, durability, stability in the elevated temperature, great toughness, high tensile strength, and great weldability. This is the reason that forged fittings are used in several industries. Some of the industries which are using the types of forged fittings are pharmaceuticals, petrochemical, oil and gas, pulp and paper, railways and several others. The SS 316/316L/316Ti Forged Fittings is also moving through several materials testing to ensure the clients that they are provided with the good quality of the forged fittings.
| 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 | - |
There are many properties which the SS 317/317L Forged Fittings is holding with it due to the presence of the alloying elements. Some of the properties which are there with the forged fittings are corrosion resistance, pitting corrosion resistance, and others. This is because of the presence of the low and high carbon contents in the alloy. Some of the properties which are there with the forged fittings are great ductility, durability, tensile strength, stability in the elevated temperatures, toughness, and others. This is the way that they are used in the industrial applications.
| 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 is the austenitic grade of stainless steel which is used in the development of the forged fittings which are there with the high temperature of the applications. And this is the way that the SS 321/321H Forged Fittings is having many properties with which they are working in the industrial applications. Some of the properties which are there with the forged fittings are great ductility, durability, high tensile strength, great toughness, and stability in the elevated temperatures.
The industries which are using the type of forged fittings are petrochemical, pharmaceuticals, oil and gas, pulp and paper, and others. This is the way that the applications in the industries are working smoothly.
| 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 is made with the various properties for the better performance in the harsh environments without any deformation to the fittings. These fittings are generally suitable for use in the high temperatures environments because of the corrosive properties. These fittings are resistive from the entire general corrosion like stress cracking corrosion, crevice corrosion, pitting corrosion, and impact corrosion as well.
These fittings have to undergo many of the tests like flaring test, mechanical test, chemical test, hardness test, macro test, micro test, flattening test, and hydrostatic test as well.
| 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 is suitable for the use in many of the general purposes and industries like water supply system, offshore oil drilling industry, gas processing, food processing, plumbing, specialty chemical industry, heat exchanger, condensers, paper industry, fertilizer industry, pulp industry, petrochemical industry, chemical equipment, pharmaceutical industry, seawater equipment, pharmaceutical industry, and cement industry as well.
| 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 |
