JIS SUS317L Austenitic Stainless Steel Plate/Coil
JIS SUS317L Austenitic Stainless Steel Plate/Coil - Low Carbon High Molybdenum Grade
SUS317L is a low-carbon austenitic stainless steel with 3-4% molybdenum, offering superior corrosion resistance, especially against pitting and crevice corrosion. Ideal for chemical, petrochemical, and marine environments.
Hot rolling, cold rolling, forming, welding, machining
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JIS SUS317L Austenitic Stainless Steel Plate/Coil Introduction
SUS317L is a low-carbon version of SUS317 austenitic stainless steel, designed to prevent intergranular corrosion after welding without post-weld annealing. It contains a high level of molybdenum (3.00–4.00%), which significantly enhances resistance to pitting and crevice corrosion in chloride-containing environments. The low carbon content (max 0.030%) minimizes carbide precipitation during welding. SUS317L is used in applications requiring high corrosion resistance, such as chemical processing equipment, flue gas desulfurization systems, and food processing machinery. It is non-magnetic in the annealed condition and cannot be hardened by heat treatment. The material is typically supplied in the solution-annealed condition with excellent formability and weldability.
JIS SUS317L Austenitic Stainless Steel Plate/Coil Chemical Composition
The chemical composition of SUS317L according to JIS G4304/G4305 ensures low carbon for improved weldability and high molybdenum for corrosion resistance. The elements listed below represent the standard ladle analysis limits.
| Element | Standard Value (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.030 | Low carbon to prevent intergranular corrosion |
| Silicon (Si) | ≤ 1.00 | Deoxidizer |
| Manganese (Mn) | ≤ 2.00 | Austenite stabilizer |
| Phosphorus (P) | ≤ 0.045 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Controlled for machinability |
| Nickel (Ni) | 11.00 – 15.00 | Austenite forming element |
| Chromium (Cr) | 18.00 – 20.00 | Primary corrosion resistance element |
| Molybdenum (Mo) | 3.00 – 4.00 | Enhances pitting/crevice corrosion resistance |
JIS SUS317L Austenitic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Typical physical properties of SUS317L in the solution-annealed condition. These values are representative for design calculations but are not specified in JIS G4304/G4305. They are derived from published data for similar 317L stainless steel grades.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.98 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 193 | GPa | Room temperature |
| Shear Modulus (G) | 78 | GPa | Room temperature |
| Poisson's Ratio (ν) | 0.28 | - | Room temperature |
| Thermal Expansion (α) | 16.0 | 10⁻⁶/K | 20–100°C |
| Thermal Expansion (α) | 16.5 | 10⁻⁶/K | 20–316°C |
| Thermal Expansion (α) | 17.0 | 10⁻⁶/K | 20–538°C |
| Thermal Conductivity (λ) | 14.0 | W/m·K | at 100°C |
| Thermal Conductivity (λ) | 15.9 | W/m·K | at 500°C |
| Specific Heat Capacity | 500 | J/kg·K | 0–100°C |
| Electrical Resistivity (ρ_e) | 0.75 | μΩ·m | Room temperature |
JIS SUS317L Austenitic Stainless Steel Plate/Coil Mechanical Properties
The mechanical properties of SUS317L are specified in JIS G4304/G4305 for plate and coil products in the solution-annealed condition. Values vary with product thickness. The elongation requirements depend on thickness, and typical minima are given below. Hardness and bend test requirements are also listed.
| Property | Standard Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (0.2% offset, ReH) | ≥ 175 | MPa | Room temperature, solution annealed |
| Tensile Strength (Rm) | ≥ 480 | MPa | Room temperature, solution annealed |
| Elongation (A) | ≥ 40 | % | Thickness ≥ 3.0 mm, gauge length 50 mm |
| Elongation (A) | ≥ 40 | % | Thickness 2.5–3.0 mm |
| Elongation (A) | ≥ 35 | % | Thickness 1.5–2.5 mm |
| Elongation (A) | ≥ 32 | % | Thickness 1.2–1.5 mm |
| Elongation (A) | ≥ 30 | % | Thickness 0.3–1.2 mm |
| Hardness (HBW) | ≤ 187 | - | Solution annealed, for reference |
| Hardness (HRB) | ≤ 90 | - | Solution annealed, for reference |
| Hardness (HV) | ≤ 200 | - | Solution annealed, for reference |
| Bend Test | No cracks, bend angle 180° | - | Bend radius = 2 × thickness (t ≤ 12.7 mm) |
JIS SUS317L Austenitic Stainless Steel Plate/Coil Completely Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A240/A240M | UNS S31703 (317L) | Chemical composition and mechanical properties equivalent |
| Europe | EN 10088-2/3 | X2CrNiMo18-15-4 (1.4438) | Identical to SUS317L with slight composition tolerance differences |
| China | GB/T 3280-2015 | 022Cr19Ni13Mo3 (new) / 00Cr19Ni13Mo3 (old) | Same as SUS317L |
| International | ISO 15510 | X2CrNiMo18-15-4 | Fully equivalent |
JIS SUS317L Austenitic Stainless Steel Plate/Coil Application Introduction
SUS317L is widely used in corrosive environments where standard 316L is inadequate. Its excellent resistance to pitting, crevice corrosion, and stress-corrosion cracking makes it suitable for critical chemical and marine applications. The low carbon content ensures good weldability without sensitization. Typical application areas and specific products/ components are listed below.
Product Applications: Storage tanks and pressure vessels, Reaction vessels and digesters, Piping systems and fittings, Heat exchanger plates and tubes, Column internals and demisters, Spray nozzles and scrubbing equipment, Sterilizing and autoclave components, Welded fabrications for severe service
Processed into products: Shell-and-tube heat exchanger tubesheets, Gasket contact surfaces for flanges, Centrifugal pump casings and impellers, Valve bodies and trim, Fasteners in corrosive environments (bolts, nuts), Welded pipe joints and elbows, Filter housings and strainer elements, Agitator blades and shafts
Application industries: Chemical and petrochemical processing, Flue gas desulfurization (FGD) systems, Pulp and paper production, Textile and dyeing equipment, Food, beverage, and pharmaceutical processing, Marine and offshore engineering, Condensers, evaporators, and heat exchangers, Nuclear fuel reprocessing
JIS SUS317L Austenitic Stainless Steel Plate/Coil Similar or Substitute Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS317 | Higher carbon (≤0.08%) may lead to sensitization after welding, SUS317L preferred for welded applications |
| Japan | JIS G4304/G4305 | SUS316L | Lower molybdenum (2.0-3.0%), lower pitting resistance, but more economical |
| Japan | JIS G4304/G4305 | SUS317J1 | Higher Cr and Ni, different corrosion profile, can be an upgrade option |
| USA | ASTM A240 | S31725 / S31726 (317LMN) | Nitrogen-enhanced grades with higher strength and corrosion resistance |
Notes:
SUS317L is non-hardenable by heat treatment and should be used in the solution-annealed condition for optimum corrosion resistance. Welding consumables of matching composition (e.g., ER317L filler wire) or slightly over-alloyed (e.g., ER317L with higher Mo) are recommended to maintain corrosion performance. Post-weld pickling or passivation may be required for welded areas. The material is generally non-magnetic, but slight magnetism may develop after cold working. Service temperatures should be limited to below 450°C to avoid sigma phase embrittlement.
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