Harry Fittings is a reliable producer and exporter of Houston-based Stainless Steel 317/317L forged fittings in the United States, providing high-corrosion-resistant solutions for chemical and marine applications. Manufactured to ASTM A182 standards, these fittings are specifically designed for high-temperature and corrosive service conditions like sulfur-containing atmospheres and acidic processing equipment. With vast industry expertise and rapid delivery services to Houston‘s industrial base, Harry Fittings addresses demanding piping system requirements with quality-approved, precision-forged 317/317L fittings. Their reduced carbon content in 317L improves weldability without compromising resistance to intergranular corrosion, and hence they are a popular selection for hostile pressure piping systems.
Specifications : ASTM A182 / ASME SA182
Dimensions : ASME B16.11, MSS-SP-79, MSS-SP-83, MSS-SP-95, MSS-SP-97, BS3799
Size : 1/8″ NB to 4″ NB
Type : Socketweld Fittings, Screwed-Threaded Fittings (NPT or PT Type)
Rating Pressure : Threaded End – 2000 /3000/ 6000 LBS. Socket-weld End – 3000 / 6000/ 9000 LBS.
Stainless Steel 317 has ~18–20% chromium, 11–15% nickel, 3–4% molybdenum, and <0.08% carbon. The low-carbon type 317L has max 0.03% carbon to avoid precipitation of carbides during welding. Both grades provide tensile strength ~75 ksi (515 MPa), yield strength ~30 ksi (205 MPa), and elongation of ~35%. They have high molybdenum content, which enhances resistance to crevice corrosion and pitting in chlorides. The alloy does not degrade due to elevation in temperature and can be used in corrosive, high-pressure environments within chemical process systems.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Fe |
| SS 317 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 – 20.00 | 3.00 – 4.00 | 11.00 – 15.00 | 57.845 min |
| SS 317L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 – 20.00 | 3.00 – 4.00 | 11.00 – 15.00 | 57.89 min |
| Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
| 7.9 g/cm3 | 1400 °C (2550 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
Harry Fittings is a leading supplier of Stainless Steel 317/317L Forged Fittings in Houston, USA. We offer an extensive range of Stainless Steel 317/317L Forged Fittings, renowned for their excellent corrosion resistance and high strength, which makes them perfect for demanding industrial applications like chemical processing, marine environments, and high-temperature systems. With a commitment to quality and reliable delivery, we ensure our clients receive top-tier products tailored to meet the specific needs of various industries.
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
| STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
| SS 317 | 1.4449 | S31700 | SUS 317 | – |
| SS 317L | 1.4438 | S31703 | SUS 317L | X2CrNiMo18-15-4 |
Choose Stainless Steel 317/317L Forged Fittings from Harry Fittings for superior quality, exceptional corrosion resistance, and reliable performance in extreme conditions. We offer customized solutions backed by expert support and industry experience.
Stainless steel 317/317L forged fittings provide excellent corrosion resistance, especially in high chloride environments, making them ideal for chemical, petrochemical, and marine applications These alloys have excellent strength and thermal stability even at higher levels, providing longer service life. The low carbon content of 317L reduces carbide precipitation, increases weldability and reduces the susceptibility to stress corrosion cracking. In addition, they are more resistant to oxidation and pitting, increasing the longevity of the systems. Their high resistance to sulfuric and hydrochloric acids makes them suitable for aggressive chemical applications.
Yes, custom sizes for Stainless Steel 317/317L Forged Fittings are available at Harry Fittings. We offer tailored solutions to meet your specific requirements, ensuring optimal performance for your projects. For more information, please contact us at sales@harryfittings.us
| Fitting Schedule/Class | Pipe Size – Pipe Fitting | Fitting Connection Type | Pipe Fitting Material | Max. Pressure |
|---|---|---|---|---|
| Class 150 | 1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1/2″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 1/2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 3/4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 3/4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 3/4″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 3/4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 3/4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 1″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/4″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 1-1/4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/2″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 1-1/2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 1-1/2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 2″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 2-1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 2-1/2″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 2-1/2″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 2-1/2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 2-1/2″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 3″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 3″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 3″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 3″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 4″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 4″ | Forged | Forged Stainless Steel 317 | 275 psi |
| Class 150 | 4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 4″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 6″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 6″ | FNPT | Stainless Steel 317 | 150 psi |
| Class 150 | 6″ | Welded | Stainless Steel 317 | 150 psi |
| Class 150 | 6″ | Welded | Stainless Steel 317 | 150 psi |
| DN-NPT | MAJOR DIAMETER MM | TAPPING DRILL SIZE MM | TPI | PITCH MM |
|---|---|---|---|---|
| 1/16″ | 7.895 | 6.00 | 27 | 0.941 |
| 1/8″ | 10.242 | 8.25 | 27 | 0.941 |
| 1/4″ | 13.616 | 10.70 | 18 | 1.411 |
| 3/8″ | 17.055 | 14.10 | 18 | 1.411 |
| 1/2″ | 21.223 | 17.40 | 14 | 1.814 |
| 3/4″ | 26.568 | 22.60 | 14 | 1.814 |
| 1″ | 33.228 | 28.50 | 11.5 | 2.209 |
| 1¼” | 41.985 | 37.00 | 11.5 | 2.209 |
| 1½” | 48.054 | 43.50 | 11.5 | 2.209 |
| 2″ | 60.092 | 55.00 | 11.5 | 2.209 |
| 2½” | 72.699 | 65.50 | 8 | 3.175 |
| 3″ | 88.608 | 81.50 | 8 | 3.175 |
| 3½” | 101.316 | 94.30 | 8 | 3.175 |
| 4″ | 113.973 | 107.00 | 8 | 3.175 |
| 5″ | 141.300 | 134.384 | 8 | 3.175 |
| 6″ | 168.275 | 161.191 | 8 | 3.175 |
| 8″ | 219.075 | 211.673 | 8 | 3.175 |
| 10″ | 273.050 | 265.311 | 8 | 3.175 |
| 12″ | 323.850 | 315.793 | 8 | 3.175 |
Stainless Steel 317/317L forged fittings are generally applied in flue gas desulfurization, chemical plant operations, and the pharmaceutical industry where resistance to organic and inorganic acids is of utmost importance. The fittings are superior in systems dealing with sulfur-containing compounds, chlorides, or high levels of acetic and formic acids. 317L is especially well-liked in welded structures because it resists intergranular corrosion. In the Houston area, these forged fittings are utilized within refineries, petrochemical facilities, and marine operations where temperature extremes and heavy corrosiveness demand reliable, long-lasting pipe fittings that can stand up to rigid ASME and ASTM requirements.
Get in touch with one of our Technical Sales Representatives to request a quote or get answers to any questions you may have.
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