JIS G3114 SMA400CW Weather Resistant Steel Plate
JIS G3114 SMA400CW Weather Resistant Steel Plate - Properties and Equivalents
Detailed material data for SMA400CW weather resistant steel plate according to JIS G3114, covering chemical, mechanical and physical properties, international equivalents, and application guidance.
Cutting, cold forming, welding, machining, flame cutting
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JIS G3114 SMA400CW Weather Resistant Steel Plate Introduction
SMA400CW is a hot-rolled atmospheric corrosion-resistant structural steel plate defined in JIS G3114. It is specifically designed for welded structures exposed to ambient weathering conditions. Through controlled additions of copper, chromium, and nickel, the steel develops a dense, adherent patina that significantly retards further corrosion, often eliminating the need for protective painting.
- Minimum tensile strength: 400 MPa
- Guaranteed Charpy impact toughness at 0°C (47 J min)
- Excellent weldability with conventional processes
- Proven long-term durability in outdoor applications
Typical uses include bridges, building frames, containers, and railway vehicles. Delivery condition is usually as-rolled; normalising or controlled rolling may be agreed.
JIS G3114 SMA400CW Weather Resistant Steel Plate Chemical Composition
Chemical composition according to JIS G3114. The elements Cu, Cr, and Ni are intentionally added to promote the formation of a protective rust layer ('patina'). Low carbon and phosphorus contents ensure good weldability and toughness. Additional microalloying elements (Mo, Nb, V, Ti) may be present by mutual agreement.
| Element | Specified Value (%) | Remarks |
|---|---|---|
| C | ≤0.18 | |
| Si | ≤0.65 | |
| Mn | ≤1.40 | |
| P | ≤0.035 | |
| S | ≤0.035 | |
| Cu | 0.30 – 0.50 | Atmospheric corrosion resistance |
| Cr | 0.45 – 0.75 | Atmospheric corrosion resistance |
| Ni | 0.05 – 0.30 | Atmospheric corrosion resistance |
JIS G3114 SMA400CW Weather Resistant Steel Plate Thermal and Electrical Physical Properties
Physical properties are close to those of ordinary structural carbon steels. The values below are typical for SMA400CW at room temperature unless stated otherwise. Slight variations may occur depending on the exact chemical composition and heat treatment condition.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 210 | GPa | ambient |
| Shear Modulus (G) | 81 | GPa | ambient |
| Poisson's Ratio (ν) | 0.3 | – | ambient |
| Thermal Expansion (α) | 12.0 | 10⁻⁶/°C | 20–100°C |
| Thermal Expansion (α) | 12.5 | 10⁻⁶/°C | 20–200°C |
| Thermal Expansion (α) | 13.0 | 10⁻⁶/°C | 20–300°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | 20°C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.20 | µΩ·m | 20°C |
JIS G3114 SMA400CW Weather Resistant Steel Plate Mechanical Properties
Mechanical properties are determined in accordance with JIS G3114. Values depend on plate thickness. Tensile tests use JIS No.5 or No.1A specimens; impact tests use V-notch Charpy specimens (longitudinal). C grade guarantees impact energy at 0°C.
| Property | Specified Value | Unit | Condition / Thickness |
|---|---|---|---|
| Yield Strength (ReH) | ≥235 | MPa | thickness ≤ 16 mm |
| Yield Strength (ReH) | ≥235 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield Strength (ReH) | ≥215 | MPa | 40 mm < thickness ≤ 75 mm |
| Yield Strength (ReH) | ≥215 | MPa | 75 mm < thickness ≤ 100 mm |
| Yield Strength (ReH) | ≥205 | MPa | 100 mm < thickness ≤ 160 mm |
| Yield Strength (ReH) | ≥195 | MPa | 160 mm < thickness ≤ 200 mm |
| Tensile Strength (Rm) | 400 – 540 | MPa | all thicknesses |
| Elongation (A) | ≥20 | % | thickness ≤ 5 mm, JIS No.5 specimen (gauge 50 mm) |
| Elongation (A) | ≥20 | % | 5 mm < thickness ≤ 16 mm, JIS No.5 specimen (gauge 50 mm) |
| Elongation (A) | ≥22 | % | 16 mm < thickness ≤ 40 mm, JIS No.1A specimen (gauge 200 mm) |
| Elongation (A) | ≥22 | % | 40 mm < thickness ≤ 100 mm, JIS No.1A specimen (gauge 200 mm) |
| Elongation (A) | ≥21 | % | 100 mm < thickness ≤ 160 mm, JIS No.1A specimen (gauge 200 mm) |
| Elongation (A) | ≥20 | % | 160 mm < thickness ≤ 200 mm, JIS No.1A specimen (gauge 200 mm) |
| Bend Test (180°) | d = 3a | – | thickness ≤ 16 mm, bend centre diameter = 3 × thickness |
| Bend Test (180°) | d = 4a | – | 16 mm < thickness ≤ 100 mm, bend centre diameter = 4 × thickness |
| Charpy Impact (KV2) | ≥47 | J | 0°C, longitudinal, V-notch |
JIS G3114 SMA400CW Weather Resistant Steel Plate Exact Equivalent Material Standards and Substitutable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3114 | SMA400CW | Original specification |
| South Korea | KS D 3529 | SMA400CW | Identical chemical and mechanical requirements |
| China | GB/T 4171 | Q235NH | Approximate equivalent; verify strength level and impact test conditions |
JIS G3114 SMA400CW Weather Resistant Steel Plate Application Introduction
SMA400CW is intended for unpainted or minimally coated structural applications where long-term atmospheric exposure is expected. It is widely used in welded fabrications that benefit from reduced maintenance. The corrosion-resistant patina forms naturally when the surface is alternately wet and dry; therefore, sheltered or continuously immersed conditions should be avoided unless protective measures are taken.
Product Applications: Weather resistant steel plates and sheets, Welded structural assemblies, Architectural exposed steelwork, Container frames and corner posts, Railway wagon bodies and underframes, Offshore platform secondary members
Processed into products: Bridge girders, cross-beams and truss members, Building columns, beams and bracing, ISO container corner posts, front/rear sill, side rails, Railroad freight car bodies and chassis, Architectural cladding and facade panels, Deck plates and stiffeners
Application industries: Bridge engineering, Building and construction (facades, roofing), Container and intermodal transport, Railway vehicle manufacture, Port and offshore structures, Architectural exposed steel design
JIS G3114 SMA400CW Weather Resistant Steel Plate Similar and Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3114 | SMA400BW | Same strength; impact at 0°C; slightly lower Cu, Cr, Ni content |
| Japan | JIS G3114 | SMA400AW | Same strength; no impact requirement; lower alloy content |
| Japan | JIS G3114 | SMA490CW | Higher strength grade (490 MPa tensile); similar weathering resistance |
| EU | EN 10025-5 | S235J0W | Comparable strength and impact; check exact chemical composition |
| USA | ASTM A709 | Grade 36 Type 3 | Weathering bridge steel; 248 MPa yield; impact optional; close in strength |
| China | GB/T 4171 | Q355NH | Higher strength (355 MPa yield); may substitute with thickness adjustment |
Notes:
Welding considerations: SMA400CW exhibits low carbon equivalent and is readily weldable by common methods (SMAW, GMAW, SAW). Preheating is generally not required for moderate thicknesses and ambient temperatures. Patina formation: Uniform corrosion resistance develops after several cycles of wetting/drying. Initial flash rusting is normal and contributes to the protective layer. Avoid continuous contact with water or buried conditions unless specially protected. Certification: Mill test certificates usually include chemical analysis, tensile properties, and impact tests as per the standard.
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