JIS G4305 SUS304L Stainless Steel
JIS G4305 SUS304L Stainless Steel - Low Carbon Austenitic Grade for Superior Weldability and Corrosion Resistance
Detailed material data for JIS G4305 SUS304L stainless steel, including chemical composition, mechanical and physical properties, international equivalents, and application guidance for pipes and structural components.
Welding, bending, deep drawing, machining (with adequate tooling due to work hardening), polishing, and passivation.
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JIS G4305 SUS304L Stainless Steel Introduction
SUS304L is a low‑carbon variant of the widely used 304 austenitic stainless steel specified in JIS G4305 (cold‑rolled stainless steel plate, sheet and strip). The reduced carbon content (max 0.030%) effectively suppresses chromium‑carbide precipitation during welding, eliminating the risk of intergranular corrosion in the as‑welded condition. The alloy offers excellent corrosion resistance in a wide range of atmospheric, chemical, and food‑processing environments, as well as good formability and toughness at cryogenic temperatures. Typical applications include piping systems, heat exchangers, kitchen equipment, and architectural components, where both durability and fabrication ease are required.
JIS G4305 SUS304L Stainless Steel Chemical Composition
Chemical composition limits according to JIS G4305:2012 for grade SUS304L. The low carbon content ensures resistance to intergranular corrosion after welding. All values are maximum unless a range is given.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤0.030 | Low carbon to prevent sensitization |
| Si | ≤1.00 | |
| Mn | ≤2.00 | |
| P | ≤0.045 | |
| S | ≤0.030 | |
| Ni | 9.00 – 13.00 | Stabilizes austenite |
| Cr | 18.00 – 20.00 | Provides corrosion resistance |
JIS G4305 SUS304L Stainless Steel Physical Properties
Typical physical data for SUS304L in the annealed condition. Values are representative for general engineering calculations and are not guaranteed by JIS G4305. Actual values may vary slightly depending on exact composition and processing.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.93 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 193 | GPa | 20°C |
| Shear Modulus (G) | 77 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.29 | – | 20°C |
| Thermal Expansion Coefficient (α) | 17.3 | 10⁻⁶/°C | 0–100°C |
| Thermal Expansion Coefficient (α) | 18.5 | 10⁻⁶/°C | 0–500°C |
| Thermal Conductivity (λ) | 16.3 | W/m·K | 100°C |
| Thermal Conductivity (λ) | 21.5 | W/m·K | 500°C |
| Specific Heat Capacity (c) | 500 | J/(kg·K) | 0–100°C |
| Electrical Resistivity (ρe) | 0.72 | μΩ·m | 20°C |
JIS G4305 SUS304L Stainless Steel Mechanical Properties
Minimum tensile properties at room temperature for solution‑annealed condition, as required by JIS G4305. Elongation test piece and gauge length depend on product thickness. These values apply to flat products; pipe mechanical requirements may differ if specified by a pipe standard.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (0.2% offset) | ≥175 | MPa | Room temperature |
| Tensile Strength | ≥480 | MPa | Room temperature |
| Elongation (A) | ≥40 | % | Thickness ≤8 mm, gauge length 50 mm |
| Elongation (A) | ≥40 | % | Thickness >8 mm ≤20 mm, gauge length 200 mm |
| Elongation (A) | To be agreed | % | Thickness >20 mm |
JIS G4305 SUS304L Stainless Steel Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS304L | Original specification |
| China | GB/T 20878, GB/T 4237 | 022Cr19Ni10 (00Cr19Ni10) | Chemically identical; also in GB/T 24511 for pressure vessels |
| USA | ASTM A240/A240M | 304L (UNS S30403) | Commonly used plate/sheet standard |
| Europe | EN 10088‑2, EN 10088‑3 | 1.4307 (X2CrNi18-9) | Slightly lower Ni (8.0–10.5%), otherwise equivalent |
| International | ISO 15510 | X2CrNi19-11 | Ni range 10.0–12.0%, close to SUS304L |
JIS G4305 SUS304L Stainless Steel Application Introduction
SUS304L is selected where the excellent corrosion resistance and formability of 304 are required, but welding is performed without subsequent solution annealing. The low carbon grade is essential for heavy‑section welding or service in corrosive media to avoid intergranular attack. Typical uses span pressure vessels, piping, and structural components in aggressive environments.
Product Applications: Welded and seamless pipes and tubes for corrosive fluids, Plate heat exchangers and pressure vessels, Storage tanks and silos for chemicals and foodstuffs, Kitchen sinks, countertops, and food processing machinery, Architectural cladding, elevator panels, and sculptures, Cryogenic pipework and liquefied gas tanks
Processed into products: Pipe spools, elbows, flanges, and fittings (JIS G3459 or B2220), Tube‑side baffles and tube sheets in heat exchangers, Impellers and shafts in centrifugal pumps, Dished heads and shell courses for pressure vessels, Stamped and drawn kitchenware (sinks, pots), Welded beams and brackets for structural applications
Application industries: Chemical and petrochemical processing, Food and beverage production equipment, Pharmaceutical and biotechnology plants, Architecture and construction (facades, roofing), Cryogenic engineering (LNG storage and transport), Automotive (exhaust systems, trim), Water treatment and desalination
JIS G4305 SUS304L Stainless Steel Similar and Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G4305 | SUS304 | Higher carbon (≤0.08%); may sensitize after welding unless annealed |
| China | GB/T 20878 | 06Cr19Ni10 (304) | Higher carbon counterpart of SUS304L |
| USA | ASTM A240 | 304 (UNS S30400) | Similar corrosion resistance but inferior weldability due to carbon |
| Japan | JIS G4305 | SUS304J1 | Cu added for improved deep drawability; slightly different composition |
| Europe | EN 10088‑2 | 1.4301 (X5CrNi18-10) | Standard 304 grade, higher carbon |
Notes:
For pipe applications, the relevant standard is often JIS G3459 (stainless steel pipes) or JIS G3468 (large diameter welded pipes), which invoke JIS G4305 for chemical and mechanical requirements; verify the actual pipe specification. The typical hardness of solution‑annealed SUS304L is ≤215 HBW or ≤90 HRB, though hardness is not a mandatory requirement in JIS G4305. Post‑weld heat treatment is generally not required unless to relieve residual stress for specific service conditions.
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