JIS G3114 SMA400AW Weather Resistant Steel Plate
JIS G3114 SMA400AW Weather Resistant Steel Plate - Composition, Properties & Equivalents
Detailed analysis of JIS G3114 SMA400AW weathering steel plate including chemical composition, mechanical properties, thermal conductivity, and international equivalents.
Hot rolling, welding, cutting, bending, forming
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
JIS G3114 SMA400AW Weather Resistant Steel Plate Introduction
SMA400AW is a hot-rolled atmospheric corrosion-resistant structural steel plate specified in JIS G3114. Designed for welded structures, it contains small additions of copper, chromium, and nickel to form a protective patina that significantly improves corrosion resistance in outdoor environments. The steel offers a minimum yield strength of 245 MPa (for thicknesses ≤16 mm) and a tensile strength of 400–540 MPa, with reliable toughness at 0°C.
- Excellent weathering performance without painting in many exposure conditions
- Good weldability and formability for structural fabrication
- Available in a wide range of thicknesses up to 200 mm
- Supplied in as-rolled or normalized condition
Typical applications include bridges, building facades, containers, railway vehicles, and industrial equipment where reduced maintenance and long service life are priorities.
JIS G3114 SMA400AW Weather Resistant Steel Plate Chemical Composition
Chemical composition according to JIS G3114 for SMA400AW. The controlled addition of Cu, Cr, and Ni provides the formation of a dense, adherent oxide layer that enhances atmospheric corrosion resistance. All values are in weight percent, heat analysis.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.18 | |
| Silicon (Si) | ≤0.35 | |
| Manganese (Mn) | ≤1.40 | |
| Phosphorus (P) | ≤0.035 | |
| Sulfur (S) | ≤0.035 | |
| Copper (Cu) | 0.20–0.35 | Weathering element |
| Chromium (Cr) | 0.45–0.75 | Weathering element |
| Nickel (Ni) | 0.05–0.30 | Weathering element |
JIS G3114 SMA400AW Weather Resistant Steel Plate Thermal and Electrical Physical Properties
Typical physical properties for SMA400AW weathering steel at ambient temperature. These are not specified in JIS G3114 but are representative for similar low-alloy structural steels. Density, elastic modulus, thermal expansion, and conductivity are important for design calculations.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | Room temperature |
| Elastic Modulus (E) | 200 | GPa | Room temperature |
| Shear Modulus (G) | 80 | GPa | Typical |
| Poisson's Ratio (ν) | 0.3 | — | |
| Thermal Expansion Coefficient (α) | 11.7 × 10⁻⁶ | K⁻¹ | 20–100°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | 20°C |
| Specific Heat Capacity | 460 | J/(kg·K) | Room temperature |
| Electrical Resistivity (ρ_e) | 0.22 × 10⁻⁶ | Ω·m | Room temperature |
JIS G3114 SMA400AW Weather Resistant Steel Plate Mechanical Properties
Tensile and impact properties according to JIS G3114 for SMA400AW. The values vary with plate thickness. Yield strength, tensile strength, elongation, bend test, and Charpy impact energy are determined using JIS test standards. Impact test temperature for grade A is 0°C, longitudinal V-notch specimens.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥245 | MPa | t ≤ 16 mm |
| Yield Strength (ReH) | ≥235 | MPa | 16 < t ≤ 40 mm |
| Yield Strength (ReH) | ≥215 | MPa | 40 < t ≤ 75 mm |
| Yield Strength (ReH) | ≥205 | MPa | 75 < t ≤ 100 mm |
| Yield Strength (ReH) | ≥195 | MPa | 100 < t ≤ 160 mm |
| Yield Strength (ReH) | ≥185 | MPa | 160 < t ≤ 200 mm |
| Tensile Strength (Rm) | 400–540 | MPa | t ≤ 100 mm |
| Tensile Strength (Rm) | 380–540 | MPa | 100 < t ≤ 200 mm |
| Elongation (A) | ≥21 | % | t ≤ 5 mm, No.5 test piece (L0=50 mm) |
| Elongation (A) | ≥17 | % | 5 < t ≤ 16 mm |
| Elongation (A) | ≥21 | % | 16 < t ≤ 40 mm |
| Elongation (A) | ≥23 | % | 40 < t ≤ 100 mm |
| Elongation (A) | ≥24 | % | 100 < t ≤ 160 mm |
| Elongation (A) | ≥24 | % | 160 < t ≤ 200 mm |
| Bend Test (Bend Diameter) | 1.5t (180°) | — | t ≤ 16 mm |
| Bend Test (Bend Diameter) | 2.0t (180°) | — | 16 < t ≤ 100 mm |
| Bend Test (Bend Diameter) | 2.5t (180°) | — | 100 < t ≤ 200 mm |
| Charpy Impact Energy (KV₂) | ≥27 | J | longitudinal, V-notch, 0°C |
JIS G3114 SMA400AW Weather Resistant Steel Plate Complete Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S235J0W (1.8958) | Approximate equivalent; similar weathering resistance, yield 235 MPa min, tensile 360–510 MPa. Check thickness range. |
| International (ISO) | ISO 4952 | Fe235WB | Comparable weathering steel; minimum yield 235 MPa, tensile 360–510 MPa. Use for general structural applications. |
| China | GB/T 4171 | Q265GNH | Chinese weathering steel with similar composition, yield ≥265 MPa, tensile ≥410 MPa. Verify application requirements. |
JIS G3114 SMA400AW Weather Resistant Steel Plate Application Introduction
SMA400AW is designed for welded structural applications where enhanced atmospheric corrosion resistance extends service life. It is frequently used without protective coatings, allowing the stable patina to develop. Typical industries and products include:
Product Applications: Bridge structural components, Building facades and architectural cladding, Container panels and frames, Railway car body parts, Transmission towers and poles
Processed into products: Welded beams and columns, Support brackets and connections, Stiffeners and diaphragms, Crane booms and heavy equipment parts, Corrosion-resistant housings and covers
Application industries: Construction, Bridge Engineering, Container Manufacturing, Railway Vehicles, Tower and Mast Fabrication
JIS G3114 SMA400AW Weather Resistant Steel Plate Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J0W | Higher strength weathering steel (yield 355 MPa). Suitable when higher design strength is needed; check weldability and toughness. |
| Japan | JIS G3114 | SMA490AW | Higher strength variant of JIS weathering steel (yield 365 MPa min). Impact and bending values differ; review specific requirements. |
| USA | ASTM A588 | Grade A | High-strength low-alloy weathering steel (yield 345 MPa). Widely used for bridges and structures; closely matched corrosion resistance. |
| China | GB/T 4171 | Q355NH | Chinese weathering steel with yield 355 MPa. Alternative when S235J0W is understrength and SMA400AW does not meet higher load demands. |
Notes:
Welding considerations: Use low-hydrogen welding consumables suitable for weathering steels (e.g., AWS E7018-W, ER80S-W). Preheat may be required for thicker sections to prevent cold cracking. The patina formation requires cyclic wetting and drying; in continuously damp or chemically aggressive environments, supplementary painting or surface treatment may be necessary. For full compliance, refer to the latest JIS G3114 standard and your project specifications.
- Share
