JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil - Properties & Equivalents
Comprehensive data for SUS315J1 stainless steel per JIS G4304 and JIS G4305: chemical composition, mechanical properties, physical properties, international equivalents, and application guidance.
Hot rolling, cold rolling, forming, welding, deep drawing
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JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Introduction
SUS315J1 is an austenitic stainless steel specified in JIS G4304 and JIS G4305, distinguished by its elevated silicon content (1.5–2.5%) to enhance high‑temperature oxidation resistance. It offers good mechanical strength and can operate continuously at temperatures up to approximately 1000°C. The grade is supplied in the solution‑annealed condition, providing optimal corrosion resistance and formability. Typical applications include furnace components, heat exchangers, and automotive exhaust systems. Its enhanced scaling resistance makes it a cost‑effective choice for moderate high‑temperature service where standard 304 would degrade rapidly.
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Chemical Composition
The composition of SUS315J1 is designed to maintain a stable austenitic structure while providing superior oxidation resistance through elevated silicon. Strict limits on phosphorus and sulfur ensure good hot workability and weldability. All values are in accordance with JIS G4304/G4305.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | Maintains carbide formation resistance |
| Silicon (Si) | 1.50 – 2.50 | Key element for scaling resistance |
| Manganese (Mn) | ≤ 2.00 | Austenite stabilizer, improves hot workability |
| Phosphorus (P) | ≤ 0.045 | Maximized for cleanliness |
| Sulfur (S) | ≤ 0.030 | Controls machinability and brittleness |
| Nickel (Ni) | 11.00 – 14.00 | Austenite former, corrosion and heat resistance |
| Chromium (Cr) | 17.00 – 19.00 | Primary element for oxidation/corrosion resistance |
| Nitrogen (N) | ≤ 0.11 | Contributes to strength and austenite stability |
| Iron (Fe) | Balance | Remainder |
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Thermal and Electrical Physical Properties
Typical physical properties for SUS315J1 in the solution‑annealed condition. These values are not specified in the product standards but are provided as reference data for design calculations. Slight variations may occur depending on exact composition and processing history.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.93 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 193 | GPa | 20 °C |
| Shear Modulus (G) | 78 | GPa | 20 °C |
| Poisson's Ratio (ν) | 0.30 | — | 20 °C |
| Coefficient of Thermal Expansion (α) | 16.5 | 10⁻⁶/K | 20–100 °C |
| Coefficient of Thermal Expansion (α) | 17.5 | 10⁻⁶/K | 20–500 °C |
| Thermal Conductivity (λ) | 15.0 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | 500 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | 0.72 | µΩ·m | 20 °C |
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Mechanical Properties
Minimum mechanical property values are specified by JIS G4304 and G4305. Elongation requirements depend on plate thickness and are determined using a gauge length of 50 mm (or 4√S₀). No bend test or impact toughness is mandated by these standards.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) 0.2% Proof Stress | ≥ 205 | MPa | All thicknesses; after solution heat treatment |
| Tensile Strength (Rm) | ≥ 520 | MPa | All thicknesses; after solution heat treatment |
| Elongation (A) (t ≤ 5 mm) | ≥ 40 | % | Thickness ≤ 5 mm, gauge length 50 mm |
| Elongation (A) (5 < t ≤ 10 mm) | ≥ 35 | % | 5 mm < thickness ≤ 10 mm |
| Elongation (A) (10 < t ≤ 20 mm) | ≥ 30 | % | 10 mm < thickness ≤ 20 mm |
| Elongation (A) (t > 20 mm) | ≥ 30 | % | Thickness > 20 mm |
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Exact Equivalent Materials and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304/G4305 | SUS315J1 | Original specification – high‑silicon heat‑resisting austenitic steel |
| International (ISO) | — | — | No direct ISO equivalent exists |
| Europe (EU) | EN 10095 | 1.4828 (X15CrNiSi25‑21) | Higher Cr and Ni content; similar heat resistance but different composition |
| USA | ASTM A240/A240M | UNS S30900 (309) | Higher Cr (22–24%) and Ni (12–15%); more heat resistant but may be overqualified |
| China | GB/T 4238 | — | No identical GB grade; 06Cr19Ni10Si2 is a silicon‑bearing 18Cr‑10Ni steel with lower Ni |
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Application Introduction
SUS315J1 is primarily specified for high‑temperature service where oxidation and scaling resistance are critical. The high‑silicon addition promotes the formation of a tightly adherent oxide layer, extending component life in air and combustion gases. Typical fabrication includes shearing, bending, deep drawing, and welding using standard austenitic stainless steel procedures. Post‑weld annealing is not mandatory but can restore full corrosion resistance after prolonged exposure in the 500–900°C range.
Product Applications: Furnace radiant tubes and muffles, Heat exchanger plates and tube sheets, Automotive exhaust flexible couplings, Annealing and normalizing boxes, Combustion chamber liners, Expansion bellows and compensators
Processed into products: Annealing trays and baskets, Recuperator and air preheater tubes, Oven and kiln linings, Hot gas ducting and dampers, Flame arrestor elements, Thermal reactor shells
Application industries: Heat treatment and industrial furnace manufacturing, Automotive – exhaust manifolds, mufflers, catalytic converters, Petrochemical – reactor internals, heat exchangers, Power generation – boiler tube shields, reheater tubing, Food processing – high‑temperature ovens and conveyors
JIS G4304/G4305 SUS315J1 Austenitic Stainless Steel Plate/Coil Similar / Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4304 | SUS304 | Standard 18Cr‑8Ni; lower Si (≤1.0%) reduces oxidation resistance at high temperatures; adequate for less demanding applications. |
| Japan | JIS G4304 | SUS309S | Higher Cr (22–24%) and Ni (12–15%); excellent heat resistance up to 1100°C but more costly. |
| USA | ASTM A240 | 302B (UNS S30215) | Si 2.0–3.0%, lower Ni (8–10.5%); may show reduced austenite stability and corrosion resistance. |
| EU | EN 10088‑2 | 1.4828 (X15CrNiSi25‑21) | Si 1.5–2.5% with Cr ~25%, Ni ~20%; outstanding oxidation resistance but higher alloy cost. |
| China | GB/T 4238 / GB/T 1221 | 2Cr25Ni13 / 06Cr19Ni10Si2 | 2Cr25Ni13 (≈309) offers similar heat resistance; 06Cr19Ni10Si2 has Si 1.5–2.5% but Ni 8–10.5% and lower corrosion resistance. |
Notes:
Welding: Use ER309 or similar filler metal to avoid hot cracking. Employ low heat input and clean shielding gas (Ar/Ar+He). Heat treatment: Solution anneal at 1010–1120°C followed by rapid cooling (water or air) for maximum corrosion resistance. Service limitations: Avoid prolonged exposure between 500°C and 900°C where sigma phase embrittlement may occur. Surface preparation: For critical oxidation resistance, pickling and passivation after fabrication improve scaling resistance.
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