JIS G4305 SUS317 Stainless Steel Pipe
JIS G4305 SUS317 Stainless Steel Pipe: High Mo Austenitic Grade for Superior Corrosion Resistance
Comprehensive technical data for SUS317 stainless steel pipe according to JIS G4305 and JIS G3459. Includes chemical composition, mechanical properties, thermal and electrical values, international equivalents, and application guidance.
Hot rolling, cold rolling, welding, drawing, bending, forming, machining, solution annealing
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JIS G4305 SUS317 Stainless Steel Pipe Introduction
SUS317 is an austenitic stainless steel with enhanced molybdenum content (3-4%) for improved pitting and crevice corrosion resistance compared to standard 316 grades. It offers excellent resistance in acidic environments, high strength, and good formability. Supplied in solution-annealed condition, SUS317 pipes are extensively used in chemical processing, heat exchangers, and marine applications. The grade is specified under JIS G4305 for cold-rolled plates and sheets, but pipe products typically follow JIS G3459. Its low carbon content (<0.08%) provides adequate weldability without post-weld sensitization. Key attributes include high tensile strength (≥520 MPa), adequate yield (≥205 MPa), and good elongation (≥35%). The addition of molybdenum significantly boosts resistance to sulfuric, phosphoric, and organic acids.
JIS G4305 SUS317 Stainless Steel Pipe Chemical Composition
Typical chemical composition of SUS317 according to JIS G4305:2012. All values are maximum unless a range is given. The molybdenum content (3.00-4.00%) and chromium content (18.00-20.00%) are critical for corrosion resistance. Low carbon helps maintain weldability. Sulfur and phosphorus are controlled as impurities.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Max limit |
| Silicon (Si) | ≤ 1.00 | Max limit |
| Manganese (Mn) | ≤ 2.00 | Max limit |
| Phosphorus (P) | ≤ 0.045 | Max limit |
| Sulfur (S) | ≤ 0.030 | Max limit |
| Chromium (Cr) | 18.00 - 20.00 | Range |
| Nickel (Ni) | 11.00 - 15.00 | Range |
| Molybdenum (Mo) | 3.00 - 4.00 | Range |
JIS G4305 SUS317 Stainless Steel Pipe Thermal and Electrical Physical Properties
Physical properties of SUS317 at room temperature and elevated temperatures, based on typical data for austenitic stainless steel grade 317. These values are provided as general reference and may vary with specific product form and treatment condition. They are not specified in JIS G4305 or JIS G3459 but represent common industry-accepted values.
| Property | Standard/Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 8.0 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 77 | GPa | Calculated, room temperature |
| Poisson`s Ratio (ν) | 0.28 | - | Room temperature |
| Mean Coefficient of Thermal Expansion (α) 20-100°C | 16.0 | 10⁻⁶/K | 20-100°C |
| Mean Coefficient of Thermal Expansion (α) 20-500°C | 17.5 | 10⁻⁶/K | 20-500°C |
| Thermal Conductivity (λ) at 100°C | 14.0 | W/(m·K) | At 100°C |
| Thermal Conductivity (λ) at 500°C | 19.0 | W/(m·K) | At 500°C |
| Specific Heat Capacity (cp) at 0-100°C | 500 | J/(kg·K) | 0-100°C |
| Electrical Resistivity (ρₑ) | 0.74 | μΩ·m | At 20°C |
JIS G4305 SUS317 Stainless Steel Pipe Mechanical Properties
Minimum mechanical properties for SUS317 pipes according to JIS G3459:2012 (Stainless Steel Pipes). Values are for solution-annealed material tested at room temperature. Elongation values depend on wall thickness and gauge length. For pipes with wall thickness ≤ 8 mm, longitudinal elongation (L=50 mm) shall be at least 35%; for wall thickness > 8 mm, at least 30%. Transverse elongation requirements are 25% and 20%, respectively.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | ≥ 520 | N/mm² (MPa) | Room temperature, solution annealed |
| Yield Strength (ReH, 0.2% offset) | ≥ 205 | N/mm² (MPa) | Room temperature, solution annealed |
| Elongation (A), longitudinal, wall thickness ≤ 8 mm | ≥ 35 | % | Gauge length 50 mm, room temperature |
| Elongation (A), longitudinal, wall thickness > 8 mm | ≥ 30 | % | Gauge length 50 mm, room temperature |
| Elongation (A), transverse, wall thickness ≤ 8 mm | ≥ 25 | % | Gauge length 50 mm, room temperature |
| Elongation (A), transverse, wall thickness > 8 mm | ≥ 20 | % | Gauge length 50 mm, room temperature |
JIS G4305 SUS317 Stainless Steel Pipe Exact Equivalent Material Standards and Substitutable Grade Designations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305, JIS G3459 | SUS317 | Original grade |
| USA | ASTM A240/A240M, ASTM A312 | UNS S31700 (317) | Identical composition and similar mechanical properties |
| USA | AISI | 317 | AISI designation, matches UNS S31700 |
| International | ISO/TR 15510 | X5CrNiMo17-13-3 (1.4436) | Close match; Cr and Mo slightly lower (Cr 16.5-18.5, Mo 2.5-3.5). Often sold as equivalent to 317. |
| Europe | EN 10088-2, EN 10088-3 | X3CrNiMo18-12-3 (1.4449) | Exact equivalent for 317, with Cr 17.0-19.5, Ni 11.0-13.0, Mo 3.0-4.0. Not always commercially available. |
JIS G4305 SUS317 Stainless Steel Pipe Application Introduction
SUS317 stainless steel pipe is selected for demanding corrosive environments where standard 316 grades may fail. Its elevated molybdenum content provides resistance to pitting and crevice corrosion in chloride-containing media. It is particularly suited for handling sulfuric, phosphoric, and organic acids. Industries benefit from its good mechanical strength and ability to be formed into complex components.
- Chemical and petrochemical process equipment
- Heat exchangers and condensers
- Pulp and paper mill digesters and bleach plants
- Pharmaceutical and food processing vessels
- Marine and offshore equipment
Product Applications: Heat exchangers and condensers, Process piping systems for corrosive fluids, Storage tanks and pressure vessels, Digesters and bleach washing systems, Distillation columns and reactors, Seawater cooling lines
Processed into products: Pipe spools and fittings (elbows, tees, reducers), Heat exchanger tube bundles, Valve bodies and trims, Pump casings and impellers, Flanges and gaskets, Instrumentation tubing, Expansion joints
Application industries: Chemical Processing, Petrochemical and Refining, Pulp and Paper, Pharmaceutical, Food and Beverage, Marine Engineering, Flue Gas Desulfurization (FGD) plants, Power Generation
JIS G4305 SUS317 Stainless Steel Pipe Similar/Comparable Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS316 | Lower Mo (2.0-3.0%), slightly lower corrosion resistance but lower cost |
| Japan | JIS G4305 | SUS317L | Ultra-low carbon (≤0.030) variant, better weldability, similar corrosion resistance |
| USA | ASTM A240 | UNS S31603 (316L) | Low-carbon version of 316, commonly used as economic alternative for less severe environments |
| USA | ASTM A240 | UNS N08904 (904L) | Higher Ni and Mo, superior resistance in sulfuric acid, often substituted for 317 in extreme conditions |
| Europe | EN 10088-2 | X2CrNiMo18-15-4 (1.4438) | Higher Mo (4.0-5.0%) and Ni (14.0-17.0%), better pitting resistance than 317 |
Notes:
SUS317 can be welded with matching filler metals (e.g., ER317 or E317 electrode). Post-weld heat treatment is generally not required but full solution annealing can restore optimum corrosion resistance. Machining requires rigid tools and positive feeds due to work hardening. Avoid prolonged exposure at 550-850°C to prevent sigma phase embrittlement. In high-temperature service above 800°C, scaling resistance may limit use. For applications requiring maximum intergranular corrosion resistance after welding, consider low-carbon SUS317L.
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