SUS304N2 Stainless Steel (JIS G4304/G4305)
SUS304N2 Stainless Steel (JIS G4304/G4305) - High-Strength Austenitic Grade with Nitrogen Strengthening
Comprehensive data for SUS304N2 stainless steel plate and coil according to JIS G4304 and JIS G4305. Includes chemical composition, mechanical properties, thermal and electrical physical properties, and international equivalent grades.
Hot rolling, cold rolling, forming, welding, machining
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
SUS304N2 Stainless Steel Introduction
SUS304N2 is a nitrogen-enhanced austenitic stainless steel specified in JIS G4304 (hot-rolled) and JIS G4305 (cold-rolled). By adding nitrogen (0.10–0.25%), the material achieves higher yield and tensile strength than standard SUS304 while retaining good corrosion resistance, weldability, and formability. The typical structure is fully austenitic after solution annealing, making it non-magnetic.
- Excellent strength without significant loss of ductility
- Good general corrosion resistance, similar to 304 but slightly enhanced strength
- Available as plate, coil, sheet, and strip for structural and pressure applications
SUS304N2 Stainless Steel Chemical Composition
Chemical composition according to JIS G4304 and JIS G4305 for SUS304N2. Nitrogen is intentionally added to enhance mechanical properties, while other elements are tightly controlled to maintain corrosion resistance and workability.
| Element | Standard Value (mass %) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.08 | |
| Silicon (Si) | ≤ 1.00 | |
| Manganese (Mn) | ≤ 2.50 | |
| Phosphorus (P) | ≤ 0.045 | |
| Sulfur (S) | ≤ 0.030 | |
| Nickel (Ni) | 7.00 - 9.50 | |
| Chromium (Cr) | 18.00 - 20.00 | |
| Nitrogen (N) | 0.10 - 0.25 | Solid-solution strengthening element |
SUS304N2 Stainless Steel Thermal and Electrical Physical Properties
Typical physical property values for SUS304N2 at room and elevated temperatures. Although not part of the mandatory standard, these values are representative of the grade and are influenced by the nitrogen addition. Slight variations may occur depending on processing and temper.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.93 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 193 | GPa | At 20 °C |
| Shear Modulus (G) | 77 | GPa | At 20 °C |
| Poisson's Ratio (ν) | 0.29 | — | At 20 °C |
| Thermal Expansion Coeff. (α) | 16.0 | ×10⁻⁶ /K | 20–100 °C |
| Thermal Expansion Coeff. (α) | 17.2 | ×10⁻⁶ /K | 20–500 °C |
| Thermal Conductivity (λ) | 14.5 | W/(m·K) | At 20 °C |
| Thermal Conductivity (λ) | 16.2 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 21.5 | W/(m·K) | At 500 °C |
| Specific Heat Capacity | 500 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.72 | µΩ·m | At 20 °C |
SUS304N2 Stainless Steel Mechanical Properties
Mechanical properties per JIS G4304 (hot-rolled plates) and JIS G4305 (cold-rolled sheets/strips) in solution-annealed condition at room temperature. Elongation requirements vary with material thickness.
| Property | Standard Requirement Value | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield Strength (0.2% offset) | ≥ 275 | MPa | All thicknesses ≤ 75 mm, as-annealed |
| Tensile Strength | ≥ 550 | MPa | All thicknesses ≤ 75 mm, as-annealed |
| Elongation (A) | ≥ 35 | % | Thickness ≤ 5 mm |
| Elongation (A) | ≥ 40 | % | Thickness > 5 mm ≤ 8 mm |
| Elongation (A) | ≥ 40 | % | Thickness > 8 mm ≤ 20 mm |
| Elongation (A) | ≥ 35 | % | Thickness > 20 mm ≤ 75 mm |
SUS304N2 Stainless Steel Fully Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Japan | JIS G4304 / JIS G4305 | SUS304N2 | Primary specification; hot-rolled plate (G4304) and cold-rolled coil/sheet (G4305) |
| Japan | JIS G4303 | SUS304N2 | For stainless steel bars; same grade designation |
SUS304N2 Stainless Steel Application Introduction
SUS304N2 provides superior strength compared to SUS304, enabling weight reduction or higher load-bearing capacity in many applications. Nitrogen solid-solution strengthening raises yield and tensile strengths without compromising the excellent ductility, toughness, and general corrosion resistance typical of austenitic stainless steels. This grade is widely used in structural, pressure, and fastener applications where additional strength is required, but it is not designed for highly corrosive environments where special alloys are needed. Key advantages:
- Noticeably higher strength than conventional 304 stainless steel
- Good weldability using standard stainless steel welding methods
- Excellent formability in annealed condition
- Non-magnetic in solution-annealed state
Product Applications: Pressure vessels and tanks, Heat exchanger plates and tubes, High-strength bolts, nuts, and washers, Springs and wire products, Structural beams and supports, Automobile components (manifolds, brackets), Food processing machinery components, Chemical containers and ducts
Processed into products: Flanges, gaskets, and pipeline fittings, Valve bodies and seats, Welded structural frames, Fasteners (high-strength screws, rivets), Clamps and couplings, Stamped and formed parts requiring higher strength
Application industries: Chemical and petrochemical processing, Food and beverage equipment (higher strength than 304), Automotive (exhaust systems, structural parts), Building and construction (structural sections), Springs and fasteners manufacturing, Heat exchangers and boilers, Pharmaceutical equipment
SUS304N2 Stainless Steel Similar/Comparable Substitute Materials
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| European Union | EN 10088-2 | 1.4315 (X5CrNiN19-9) | Similar nitrogen content; minor differences in Cr and Ni ranges. Often interchangeable after engineering assessment. |
| USA | ASTM A240 / A666 | 304N (UNS S30451) | Nitrogen 0.10-0.16, Ni 8.0-10.5; slightly lower nitrogen cap but comparable strength properties. Suitable alternative. |
| China | GB/T 3280 | 06Cr19Ni10N (304N) | Closely related grade with N ≤0.16 and Mn ≤2.00; may be used as a substitute with consideration of composition differences. |
Notes:
SUS304N2 is non-magnetic in the annealed condition but may become slightly magnetic after cold working. It is not recommended for severe chloride environments where stress corrosion cracking may occur. Proper post-weld heat treatment is generally not required for thin sections, but for thicker sections, solution annealing may be necessary to restore corrosion resistance. Cold forming can further increase strength but may reduce ductility.
- Share
