SUS317L Stainless Steel
SUS317L Stainless Steel - JIS G4305 Grade for Superior Corrosion Resistance in Pipe Applications
Comprehensive material data for SUS317L stainless steel pipe grade according to JIS G4305, including chemical composition, mechanical properties, thermal properties, international equivalents, and application guidance.
Cold rolling, cold forming, hot forming, welding, machining
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SUS317L Stainless Steel Introduction
SUS317L is a low-carbon, molybdenum-bearing austenitic stainless steel defined in JIS G4305 for cold-rolled plate, sheet, and strip, commonly used to fabricate welded pipes for severe corrosive service. With increased molybdenum content compared to 316L, it offers excellent resistance to pitting and crevice corrosion in chloride-containing environments. Its low carbon minimises carbide precipitation during welding, enabling as-welded components. The alloy is non-magnetic in the annealed condition, exhibits good formability and weldability, and can withstand a wide range of acidic and chemical media.
Key features:
- Molybdenum addition (3.0–4.0%) for enhanced pitting resistance
- Low carbon ≤0.030% suppresses sensitisation
- High chromium (18–20%) and nickel (11–15%) for general corrosion resistance
- Can be used in as-welded condition without post-weld heat treatment
SUS317L Stainless Steel Chemical Composition per JIS G4305
The chemical composition of SUS317L is tightly controlled to ensure optimum corrosion resistance and weldability. The low carbon content prevents intergranular corrosion after welding, while molybdenum improves resistance to chloride-induced pitting. Nickel stabilises the austenitic structure, and chromium provides passivation. All values are in weight percent as specified in JIS G4305:2012.
- Carbon (C) ≤ 0.030
- Silicon (Si) ≤ 1.00
- Manganese (Mn) ≤ 2.00
- Phosphorus (P) ≤ 0.045
- Sulfur (S) ≤ 0.030
- Nickel (Ni): 11.00 – 15.00
- Chromium (Cr): 18.00 – 20.00
- Molybdenum (Mo): 3.00 – 4.00
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon, C | ≤0.030 | |
| Silicon, Si | ≤1.00 | |
| Manganese, Mn | ≤2.00 | |
| Phosphorus, P | ≤0.045 | |
| Sulfur, S | ≤0.030 | |
| Nickel, Ni | 11.00 – 15.00 | |
| Chromium, Cr | 18.00 – 20.00 | |
| Molybdenum, Mo | 3.00 – 4.00 |
SUS317L Stainless Steel Typical Physical, Thermal, and Electrical Properties
Physical property values are typical for annealed SUS317L and are not mandatory in JIS G4305. They are essential for engineering design, especially thermal expansion compatibility and heat transfer calculations.
- Density: about 7.98 g/cm³
- Elastic modulus: 200 GPa
- Shear modulus: 77 GPa
- Poisson's ratio: 0.3
- Mean thermal expansion coefficient: 16.0 ×10⁻⁶/K (20–100°C)
- Thermal conductivity: ~14.0 W/m·K at 100°C
- Specific heat capacity: 500 J/kg·K
- Electrical resistivity: ~0.74 µΩ·m
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.98 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 77 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.3 | – | Room temperature |
| Coefficient of Thermal Expansion (α) | 16.0 | 10⁻⁶/K | 20 – 100°C |
| Coefficient of Thermal Expansion (α) | 16.5 | 10⁻⁶/K | 20 – 200°C |
| Coefficient of Thermal Expansion (α) | 17.5 | 10⁻⁶/K | 20 – 400°C |
| Thermal Conductivity (λ) | 14.0 | W/m·K | at 100°C |
| Thermal Conductivity (λ) | 16.3 | W/m·K | at 500°C |
| Specific Heat Capacity (cp) | 500 | J/kg·K | 0 – 100°C |
| Electrical Resistivity (ρe) | 0.74 | µΩ·m | Room temperature |
SUS317L Stainless Steel Mechanical Properties at Room Temperature per JIS G4305
The mechanical properties are guaranteed for cold-rolled SUS317L sheet/plate after solution annealing. The material exhibits high ductility (elongation ≥40%) and good strength. Values depend on thickness; the most common range is 5–8 mm. For thinner gauges, elongation may be slightly lower (≥35%).
- 0.2% yield strength (proof stress) ≥ 175 MPa
- Tensile strength ≥ 480 MPa
- Elongation ≥ 40% (thickness 5–8 mm)
These properties allow cold forming and deep drawing for pipe and component manufacturing.
| Property | Minimum Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (0.2% offset, ReH) | ≥175 | MPa | Solution annealed, at room temperature |
| Tensile Strength (Rm) | ≥480 | MPa | Solution annealed, at room temperature |
| Elongation (A) | ≥35 | % | Thickness <5 mm |
| Elongation (A) | ≥40 | % | Thickness ≥5 mm and ≤8 mm |
| Elongation (A) | ≥40 | % | Thickness >8 mm |
SUS317L Stainless Steel Completely Equivalent International Standards and Grades for SUS317L
| Country/Region | Standard | Designation/Grade | Remarks |
|---|---|---|---|
| United States | ASTM A240 / A312 | UNS S31703 (317L) | Sheet/plate and seamless/welded pipe |
| European Union | EN 10088-2 / EN 10028-7 | 1.4438 (X2CrNiMo18-15-4) | Corresponds to 317L with slightly higher Ni range |
| China | GB/T 3280 / GB/T 24511 | 022Cr19Ni13Mo3 (S31703) | Identical to JIS SUS317L |
| International | ISO 15510 | X2CrNiMo18-15-4 |
SUS317L Stainless Steel Application Introduction
SUS317L is specified for severe corrosive service where 316L does not provide sufficient pitting and crevice corrosion resistance. It is widely used in the chemical, petrochemical, marine, and pulp & paper industries. The low carbon content allows welding without intergranular attack in sections up to the maximum thickness normally supplied. Typical products include process piping, heat exchanger tubes, and reactor internal components.
It can be fabricated into many shapes:
- Welded and seamless pipe and tube for corrosive fluid transport
- Heat exchanger shells and tube sheets
- Flue gas desulfurization scrubber internals
- Food processing equipment with high chloride content
Product Applications: Welded stainless steel pipes (JIS G3459, G3446, etc.), Seamless pipes and tubes for heat exchangers, Process vessels and reactors, Storage tanks for aggressive chemicals, Piping systems for desalination and brine service, Instrumentation tubing
Processed into products: Heat exchanger tubes and baffles, Scrubber spray nozzles and internal supports, Valve bodies and pump casings, Fittings (elbows, tees, flanges), Bolts and fasteners for corrosive environments (though solution annealed is typical), Welded wire and filter mesh
Application industries: Chemical and petrochemical processing, Oil and gas (offshore platforms, refineries), Pulp and paper bleaching plants, Marine and shipbuilding, Flue gas desulfurization (FGD) systems, Pharmaceutical and food processing (where chloride pitting is a concern)
SUS317L Stainless Steel Similar or Comparable Stainless Steel Grades
| Country/Region | Standard | Designation | Comparison / Remarks |
|---|---|---|---|
| United States / Global | ASTM / UNS | S31603 (316L) | Lower Mo (2.0–2.5%); inferior pitting resistance in chloride environments |
| European Union | EN 10088 | 1.4404 (X2CrNiMo17-12-2) | Standard 316L; suitable for less aggressive media |
| Japan | JIS G4304/G4305 | SUS316L | Molybdenum ≤3.00% vs 3.00–4.00% in 317L |
| United States | ASTM A240 | 317 (UNS S31700) | Higher carbon (≤0.08%); not as-weldable without sensitisation risk |
| Global | UNS N08904 (904L) | 904L | Higher Ni, Mo, and Cu; superior corrosion resistance in strong acids, but more expensive |
Notes:
SUS317L may also be supplied in the cold-worked condition if higher strength is required; however, mechanical properties then differ from the annealed values. For piping applications, relevant standards such as JIS G3459 (stainless steel pipes for general service) or JIS G3446 (pipes for machine and structural purposes) should be consulted for dimensional and testing requirements. Post-weld pickling and passivation are recommended to restore corrosion resistance. The alloy is non-hardenable by heat treatment; only solution annealing at 1010-1120°C followed by rapid cooling achieves the fully austenitic, corrosion-resistant condition.
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