ASTM A182 F317 Forgings (UNS S31700 / 1.4449)
Open-die forged rings, flanges, shafts, bars, discs and sleeves in 317 austenitic stainless steel, made to drawing by Jiangyin Jiangnan Metal Co., Ltd.
ASTM A182 Grade F317 is the forging specification for 317 austenitic stainless steel, designated UNS S31700 and EN 1.4449. It is a molybdenum-bearing modification of 316 stainless steel, containing 18.0 to 20.0 percent chromium, 11.0 to 15.0 percent nickel and 3.0 to 4.0 percent molybdenum, with carbon limited to 0.08 percent maximum. The extra molybdenum improves resistance to pitting, crevice corrosion and acid attack compared with 316, which is why F317 is specified for pulp and paper digesters, flue gas desulphurisation equipment, chemical process vessels and marine service. Under ASTM A182/A182M, F317 forgings must reach a minimum tensile strength of 515 MPa (75 ksi) and a minimum yield strength of 205 MPa (30 ksi).
Chemical Composition of A182 F317 (UNS S31700)
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.08 max |
| Manganese | Mn | 2.00 max |
| Phosphorus | P | 0.045 max |
| Sulfur | S | 0.030 max |
| Silicon | Si | 1.00 max |
| Chromium | Cr | 18.0 to 20.0 |
| Nickel | Ni | 11.0 to 15.0 |
| Molybdenum | Mo | 3.0 to 4.0 |
| Iron | Fe | Balance, about 61 nominal |
ASTM A182 describes the grade as 19 chromium, 13 nickel, 3.5 molybdenum (317G). Every heat supplied by Jiangyin Jiangnan Metal Co., Ltd. is reported with its actual ladle analysis on the mill certificate.
Mechanical Properties of A182 F317
Specification minimums
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength, min | 515 MPa | 75 ksi |
| Yield strength (0.2% offset), min | 205 MPa | 30 ksi |
| Elongation in 50 mm or 4D, min | 30% | 30% |
| Reduction of area, min | 50% | 50% |
Typical annealed values
| Property | Metric | Imperial |
|---|---|---|
| Tensile strength | 620 MPa | 89,900 psi |
| Yield strength | 275 MPa | 39,900 psi |
| Elongation at break, 50 mm | 45% | 45% |
| Modulus of elasticity | 193 GPa | 27,993 ksi |
| Poisson's ratio | 0.27 to 0.30 | 0.27 to 0.30 |
| Hardness | 85 HRB | 85 HRB |
| Density | 8.0 g/cm3 | 0.289 lb/in3 |
| Melting point | 1370 C | 2550 F |
Equivalent Grades and Designations
| System | Designation |
|---|---|
| ASTM and ASME forging spec | ASTM A182 F317, ASME SA-182 F317 |
| UNS | S31700 |
| EN and DIN | 1.4449, X5CrNiMo 17 13 |
| AISI | 317 |
| BS | 317S16 |
| Other ASTM product specs | A167, A276, A312 |
Watch the L grade. 1.4449 is the EN number for 317 / S31700. The number 1.4438 (X2CrNiMo18-15-4) belongs to the low carbon variant 317L / UNS S31703, which is a different material with a tighter carbon limit. Check which one your drawing calls for before placing an order. We forge both.
How We Make A182 F317 Forgings
1. Melting
EAF plus VOD refining, with ESR remelt available where tighter cleanliness or segregation control is needed.
2. Open-die forging
Upsetting and drawing on hydraulic presses. Seamless rolled rings are produced on a ring-rolling mill for continuous circumferential grain flow.
3. Cooling after hot work
Forgings are cooled below 538 C (1000 F) after hot working before heat treatment, as ASTM A182 requires.
4. Solution annealing
Annealed at 1010 to 1121 C (1850 to 2050 F) and cooled rapidly to restore corrosion resistance. Grade 317 cannot be hardened by heat treatment.
5. Ultrasonic testing
UT to EN 10228-3, SEP 1921 or ASTM A388. PT, MT, PMI and ASTM A262 intergranular testing on request.
6. Certificates
EN 10204 3.1 as standard. EN 10204 3.2 with third party witness such as TUV, BV, LR or SGS on request.
F317 Forged Products We Supply
Parts are made to customer drawing or to standard dimensions, delivered black, rough turned, proof machined or finish machined.
| Product family | Typical items |
|---|---|
| Forged and rolled rings | Seamless rolled rings, retaining rings, flange blanks |
| Flanges | Weld neck, slip-on, blind, orifice, long weld neck, ASME B16.5 and custom patterns |
| Bars and billets | Round, square, flat and stepped forged bar |
| Shafts and spindles | Step shafts, eccentric shafts, crankshafts, pinion blanks |
| Discs and tube sheets | Forged discs, blanks, tube sheets, blind plates, gear blanks |
| Hollow parts | Sleeves, bushings, cylinders, hollow bar, forged pipe and tube |
| Valve and pressure parts | Valve bodies, bonnets, stems, seat rings, blocks, nozzles, manifolds |
Tell us the maximum outside diameter, length and single-piece weight in your enquiry and we will confirm it against our press and ring mill capacity.
Where A182 F317 Is Used
The 3 to 4 percent molybdenum in grade 317 makes it the next step above 316 wherever chloride pitting or acid attack limits service life. F317 forgings are commonly specified for pulp and paper digesters, liquor tanks and paper machine parts, chemical and petrochemical process equipment, flue gas desulphurisation scrubbers, absorber towers and stack liners, heat exchangers, condensers and pressure vessels, textile processing plant, and marine and offshore valves, pumps and piping components. The grade resists atmospheric corrosion and works in both moderately oxidising and moderately reducing conditions.
Common Questions
What is the difference between A182 F317 and A182 F317L?
Both are 317 type austenitic stainless steels with 3 to 4 percent molybdenum. F317 (UNS S31700, EN 1.4449) allows up to 0.08 percent carbon. F317L (UNS S31703, EN 1.4438) is the low carbon version with a much tighter carbon limit, which lowers the risk of chromium carbide precipitation and intergranular attack in the weld heat affected zone. Pick F317L for welded fabrications that cannot be solution annealed afterwards. F317 holds slightly higher strength at elevated temperature.
Is A182 F317 better than 316 stainless steel?
For pitting and crevice corrosion in chloride bearing, sulphurous and acidic media, yes. Grade 317 is a modified 316 with higher molybdenum, so it holds up longer in those conditions. It is harder to machine than 304, so chip breakers help. Where corrosion margin is not the limiting factor, 316 or 316L is the cheaper choice.
Can A182 F317 be hardened by heat treatment?
No. Grade 317 is austenitic and does not respond to hardening heat treatment. Strength can only be raised by cold work. The standard thermal cycle is solution annealing at 1010 to 1121 C followed by rapid cooling, which softens the metal and restores corrosion resistance.
What testing and certification come with F317 forgings?
Jiangyin Jiangnan Metal Co., Ltd. supplies chemical analysis and mechanical test results on an EN 10204 3.1 certificate as standard, with EN 10204 3.2 third party certification available. Ultrasonic examination follows EN 10228-3, SEP 1921 or ASTM A388 as specified. Intergranular corrosion testing to ASTM A262, positive material identification, hardness survey and impact testing can be added.
How do I get a price for A182 F317 forgings?
Send a drawing, or the raw sizes (outside diameter by inside diameter by height for rings, diameter by length for bars and shafts), together with quantity, the specification revision you work to, machining allowance and testing requirements. Email sales@steelforgepieces.com or call +86 189 2135 9659. Jiangyin Jiangnan Metal Co., Ltd. is at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China.
Related Stainless Steel Forging Grades
Technical data on this page follows ASTM A182/A182M and published grade 317 datasheets and is given for guidance. Always check the current edition of the specification and your own project requirements. Page reviewed .