While molybdenum-bearing grade 316 contains about 2% - 3% of the said element, grade 317 is an alloy that contains more than 3% of moly in its chemistry. Hence, it is safe to say that the Stainless Steel 317L Seamless Pipe is an improved version of marine grade alloy 316. Along with molybdenum, the alloy has additions of both chromium and nickel. And so, the ASTM A312 TP 317 Rectangular Pipe has higher corrosion resistance properties as well.
Therefore, the material demonstrates a higher level of resistance to several acidic solutions including acetic acid, formic acid, citric acid, sulfurous acid, and tartaric acid. These acids are found in various industries ranging from textile to pharma and food and beverage. Since the ASTM A312 TP 317L Square Pipe performs well in such conditions, it is seen as an asset in such businesses. The content of carbon in this alloy is low. Hence, the DIN 1.4438 schedule 40 pipe exhibits resistance to sensitization during welding operations.
Due to its low carbon content, the UNS S31703 ERW Pipe offers other properties such as higher creep strength, higher stress to rupture, along with no adverse effects to its tensile strength properties at elevated temperatures. In fact, the inclusion of higher levels of elements like chromium, molybdenum, and nickel in the SS 317L Welded Pipe brings an incline in its tensile strength. Although the alloy is a low carbon-containing alloy, the difference between 317 Vs 317L SS Pipe is that grade 317L, has an even lower content of carbon.
| Standard Specification | ASTM A 312/ ASME SA 312/ A790/ SA790/ EN10216-5 |
| Size | ½” to 6” NB Sch 10s, 40s, & 80s, 160s |
| Wall Thickness | 0.1 - 60 mm |
| SS Seamless Pipe Length |
|
| Seamless SS Pipe Surface Finish | Cold Finish, Bright, Polished, Annealing, Pickling, or as per client requirements |
| Standard | JIS, AISI, ASME, ASTM, AMS, GB, DIN, EN, GOST |
| Manufacturing types | Seamless, Welded, ERW, EFW |
| Manufacturing Shapes | Round, Square, Rectangle, Box Section |
| Manufacturing Technology | Hot / Cold Formed |
| Other Grades | SS 446 |
| Inspection, Test Reports | EN 10204 3.1, Mill Test Certificates, PMI Test Reports, Chemical Reports, Mechanical Reports, NABL Approved Lab Reports, Visual Inspection Reports, Destructive and Non Destructive Test Reports, Third Party Inspection |
| Technique | Cold Rolled Hot Rolled |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 317L | 0.035 max | 2 max | 1 max | 0.040 max | 0.03 max | 18 – 20 | 3 – 4 | 11 – 15 | – |
| Density | 8.0 g/cm3 |
| Melting Point | 1454 °C (2650 °F) |
| Tensile Strength | Psi – 75000 , MPa – 515 |
| Yield Strength (0.2%Offset) | Psi – 30000 , MPa – 205 |
| Elongation | 35 % |
| STANDARD | WERKSTOFF NR. | UNS | JIS | AFNOR | BS | GOST | EN |
| SS 317L | 1.4438 | S31703 | – | – | – | – | – |
| NPS | ASTM A312 OD Tolerance | |||
| + | – | |||
| inch | mm | inch | mm | |
| 1/8~1 1 /2 | 1/64(0.015) | 0.4 | 1/32(0.031) | 0.8 |
| > 1 1 /2~4 | 1/32(0.031) | 0.8 | 1/32(0.031) | 0.8 |
| > 4~8 | 1/16(0.062) | 1.6 | 1/32(0.031) | 0.8 |
| > 8~18 | 3/32(0.093) | 2.4 | 1/32(0.031) | 0.8 |
| > 18~26 | 1/8(0.125) | 3.2 | 1/32(0.031) | 0.8 |
| > 26~34 | 5/32(0.156) | 4 | 1/32(0.031) | 0.8 |
| > 34~48 | 3/16(0.187) | 4.8 | 1/32(0.031) | 0.8 |
