SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 - Heat Resistant Grade
Comprehensive material data for SUS309S stainless steel plate and coil under JIS G4304 and G4305, including chemical composition, mechanical properties, physical constants, international equivalents, and application guidance.
Hot rolling, cold rolling, solution annealing, pickling, skin passing, welding, deep drawing, bending
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SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Introduction
SUS309S is a low‑carbon austenitic stainless steel standardized in JIS G4304 (hot‑rolled) and JIS G4305 (cold‑rolled). With approximately 22–24% chromium and 12–15% nickel, it offers excellent resistance to high‑temperature oxidation and scaling up to about 1000°C in continuous service. The controlled carbon content (≤0.08%) significantly reduces the risk of intergranular corrosion after welding or slow cooling, making it suitable for as‑welded applications.
- Superior oxidation resistance in cyclic and continuous high‑temperature environments
- Good strength and ductility in the annealed condition
- Low susceptibility to sigma phase embrittlement at moderate temperatures
- Readily formable and weldable by common fusion and resistance methods
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Chemical Composition
The composition conforms to JIS G4304/G4305 for grade SUS309S. The low carbon content minimises carbide precipitation during welding and enhances corrosion resistance in the as‑welded condition. All elements are controlled to ensure stable austenitic structure and high‑temperature oxidation resistance.
| Element | Specified Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Low carbon for improved intergranular corrosion resistance |
| Silicon (Si) | ≤ 1.00 | Aids oxidation resistance |
| Manganese (Mn) | ≤ 2.00 | Austenite stabilizer |
| Phosphorus (P) | ≤ 0.045 | Impurity control |
| Sulfur (S) | ≤ 0.030 | Impurity control |
| Nickel (Ni) | 12.00 – 15.00 | Austenite former, promotes ductility |
| Chromium (Cr) | 22.00 – 24.00 | Primary element for oxidation and corrosion resistance |
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Physical Properties
Physical constants at ambient and elevated temperatures are typical for 22%Cr‑13%Ni austenitic stainless steel and derived from published data for similar grades. They are not mandatory in JIS G4304/G4305 but are essential for engineering design.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.98 | g/cm³ | At 20 °C |
| Modulus of elasticity (E) | 200 | GPa | At 20 °C |
| Shear modulus (G) | 77 | GPa | At 20 °C |
| Poisson's ratio (ν) | 0.30 | – | At 20 °C |
| Thermal expansion coefficient (α) | 14.9 | 10⁻⁶/K | 20–100 °C |
| Thermal expansion coefficient (α) | 17.5 | 10⁻⁶/K | 20–500 °C |
| Thermal expansion coefficient (α) | 19.0 | 10⁻⁶/K | 20–1000 °C |
| Thermal conductivity (λ) | 15.0 | W/(m·K) | At 100 °C |
| Thermal conductivity (λ) | 18.0 | W/(m·K) | At 500 °C |
| Specific heat capacity | 500 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρₑ) | 0.78 | µΩ·m | At 20 °C |
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Mechanical Properties at Room Temperature
Values are minimum unless otherwise stated, according to JIS G4304 and G4305 for plate/coil in the solution‑annealed state. Elongation depends on thickness and gauge length. Hardness is optional but commonly specified. Bending test demonstrates formability.
| Property | Specified Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (0.2% proof, ReH) | ≥ 205 | MPa | Room temperature, annealed |
| Tensile strength (Rm) | ≥ 520 | MPa | Room temperature, annealed |
| Elongation (A) | ≥ 40 | % | Thickness ≤ 5 mm, gauge length 50 mm |
| Elongation (A) | ≥ 50 | % | Thickness > 5 mm ≤ 8 mm, gauge length 200 mm |
| Elongation (A) | ≥ 45 | % | Thickness > 8 mm ≤ 15 mm, gauge length 200 mm (hot‑rolled) |
| Hardness HBW | ≤ 201 | – | Optional requirement, annealed |
| Hardness HRB | ≤ 95 | – | Optional requirement, annealed |
| Hardness HV | ≤ 210 | – | Optional requirement, annealed |
| Bend test | No cracks on outside | – | 180° bend, bend diameter = thickness |
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Fully Equivalent International Standards and Substitute Grades
The following grades share identical chemical and mechanical requirements under their respective national standards and can be directly substituted for SUS309S in most applications.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS309S | Original specification |
| USA | ASTM A240/A240M | UNS S30908 (Type 309S) | Identical C ≤ 0.08, Cr 22.0–24.0, Ni 12.0–15.0 |
| Europe | EN 10088‑2/3 | 1.4833 – X12CrNi23‑13 | Also EN 10095 for heat‑resisting steel; carbon ≤ 0.08 |
| China | GB/T 3280/4237 | 06Cr23Ni13 (new), 0Cr23Ni13 (old) | Corresponds to S30908 |
| Korea | KS D 3698/3705 | STS309S | Equivalent to JIS SUS309S |
| International | ISO 15510 | X12CrNi23‑13 | Identical composition |
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Application Introduction
SUS309S is primarily used in high‑temperature environments where resistance to oxidation and scaling is more critical than mechanical strength. Its low carbon content permits as‑welded fabrication without post‑weld annealing.
- Excellent resistance to thermal cycling and thermal shock
- Can be used in both oxidizing and slightly reducing atmospheres
- Not recommended for heavy sulphidizing environments or where high‑temperature strength alone is the primary requirement
Product Applications: Industrial furnaces: radiant tubes, burner nozzles, heat treatment baskets, muffles, retorts, Heat exchangers for flue gas or high‑temperature air, Thermal oxidizers and afterburners, Ducting and expansion joints in exhaust systems, Kiln furniture (supports, trays, fans)
Processed into products: Radiant tubes and radiant coils, Furnace hearth rollers and skid rails, Heat treatment baskets and charging grids, Combustion chamber liners, Exhaust gas recirculation (EGR) cooler tubes, Thermocouple protection sheaths (up to ~1000°C)
Application industries: Heat treatment and furnace construction, Petrochemical and refinery, Power generation (gas turbine supplemental parts), Automotive exhaust and emission control, Chemical processing (high‑temperature kilns, reactors)
SUS309S Austenitic Stainless Steel Plate/Coil to JIS G4304/G4305 Similar or Alternative Materials
These grades exhibit comparable oxidation resistance or mechanical properties but differ in certain alloy content. Selection depends on specific service conditions such as temperature, atmosphere, and mechanical load.
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS310S | Higher Cr (24–26%) and Ni (19–22%) for superior oxidation resistance up to 1100°C; lower thermal expansion mismatch |
| Japan | JIS G4304/G4305 | SUS304 | Economy grade with 18%Cr‑8%Ni, used up to 800°C, but less oxidation resistance than 309S |
| USA | ASTM A240/A240M | 309 (UNS S30900) | Higher carbon (max 0.20) than 309S, may require post‑weld heat treatment to avoid sensitization |
| Europe | EN 10088‑2/3 | 1.4828 – X15CrNiSi20‑12 | Si alloyed heat‑resistant steel with good oxidation behaviour up to 1000°C, lower Ni content |
| Japan | JIS G4312 | SUH309 | Heat‑resisting steel grade; similar base composition but may have slight carbon differences |
Notes:
Welding: Can be welded by common methods (TIG, MIG, SMAW) without preheating. Post‑weld heat treatment is generally not required thanks to low carbon. Surface finish: For cold‑rolled sheet/coil, finishes such as 2B, BA, No.4, and hairline are available. Ordering information: The standard dimensions and tolerances follow JIS G4304/G4305. When ordering, specify thickness, width, edge condition, and surface finish. Special requirements: Intergranular corrosion test (e.g., JIS G0575 oxalic acid etchtest) can be specified for critical applications.
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