JIS G3114 SMA570P Weather Resistant Steel Plate
JIS G3114 SMA570P Weather Resistant Steel Plate - High-Strength Structural Steel for Welded Bridges and Buildings
SMA570P is a high-strength weather-resistant hot-rolled steel plate standardised under JIS G3114, primarily used for painted welded structures in bridge, construction, and railway applications.
Hot rolling, normalising, cutting, welding, bending, drilling, machining
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JIS G3114 SMA570P Weather Resistant Steel Plate Introduction
SMA570P is a high-strength atmospheric corrosion-resistant hot-rolled steel for welded structures specified in JIS G3114 (Japan). It is designed for applications where the structure is normally painted, as indicated by the suffix "P". The steel offers a minimum tensile strength of 570 MPa and good weldability. Its alloying with copper, chromium, and nickel provides enhanced resistance to atmospheric corrosion compared to plain carbon steels.
Key features:
- Minimum yield strength of 460 MPa for thicknesses up to 16 mm
- Tensile strength range: 570–720 MPa
- Good forming and welding characteristics
- Improved corrosion resistance through controlled additions of Cu, Cr, and Ni
- Available in plate form up to 160 mm thickness
JIS G3114 SMA570P Weather Resistant Steel Plate Chemical Composition
The ladle analysis according to JIS G3114 for SMA570P. Elements not listed may be present as residuals. Cu, Cr, and Ni are added to provide atmospheric corrosion resistance. Fine grain practice elements such as Nb, V, or Ti may be used by the manufacturer, but their contents are not specified in the standard for this grade (optional).
| Chemical Element | Specified Value (max % or range) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.18 | Maximum |
| Silicon (Si) | 0.15 – 0.65 | Range |
| Manganese (Mn) | ≤ 1.40 | Maximum |
| Phosphorus (P) | ≤ 0.035 | Maximum |
| Sulfur (S) | ≤ 0.035 | Maximum |
| Copper (Cu) | 0.30 – 0.50 | Added for weathering |
| Chromium (Cr) | 0.45 – 0.75 | Added for weathering |
| Nickel (Ni) | 0.05 – 0.30 | Added for weathering |
JIS G3114 SMA570P Weather Resistant Steel Plate Thermal and Electrical Physical Properties
The data below represent typical physical properties for low-alloyed structural steel and apply to SMA570P at room temperature unless otherwise noted. These values are not mandatory requirements of JIS G3114 but are useful for design calculations.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | 210 | GPa | At 20 °C |
| Shear Modulus (G) | 81 | GPa | At 20 °C |
| Poisson's Ratio (ν) | 0.30 | — | At 20 °C |
| Thermal Expansion Coefficient (α) | 10.8 | 10⁻⁶/K | 20–100 °C |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20–200 °C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶/K | 20–400 °C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 20 °C |
| Specific Heat Capacity (c) | 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | 0.25 | Ω·mm²/m | At 20 °C |
JIS G3114 SMA570P Weather Resistant Steel Plate Mechanical Properties
Tensile test specimens are taken in the transverse direction for plates. Yield strength (ReH) and elongation depend on plate thickness. Bend test is required with mandrel diameter as listed. Impact test is not mandatory for SMA570P but can be agreed upon; therefore, Charpy values are not included here.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 460 | MPa | Thickness ≤ 16 mm |
| Yield Strength (ReH) | ≥ 450 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield Strength (ReH) | ≥ 430 | MPa | 40 mm < thickness ≤ 75 mm |
| Yield Strength (ReH) | ≥ 420 | MPa | 75 mm < thickness ≤ 100 mm |
| Yield Strength (ReH) | ≥ 410 | MPa | 100 mm < thickness ≤ 160 mm |
| Tensile Strength (Rm) | 570 – 720 | MPa | All thicknesses |
| Elongation (A) | ≥ 19 | % | Thickness ≤ 5 mm, JIS No. 1A test piece (L₀=50 mm) |
| Elongation (A) | ≥ 26 | % | 5 mm < thickness ≤ 16 mm, JIS No. 10 test piece (L₀=5.65√S₀) |
| Elongation (A) | ≥ 20 | % | 16 mm < thickness ≤ 50 mm, JIS No. 1A test piece (L₀=200 mm) |
| Elongation (A) | ≥ 19 | % | 50 mm < thickness ≤ 100 mm, JIS No. 10 or No. 1A test piece |
| Bend Test (Bend Angle 180°) | d = 1.5t | — | Thickness ≤ 16 mm (t = plate thickness) |
| Bend Test (Bend Angle 180°) | d = 2.0t | — | 16 mm < thickness ≤ 100 mm |
| Bend Test (Bend Angle 180°) | d = 3.0t | — | 100 mm < thickness ≤ 160 mm |
JIS G3114 SMA570P Weather Resistant Steel Plate Fully Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3114 | SMA570P | Original standard – painted application, high-strength |
| International | ISO 4952-2 | S460W | Chemically and mechanically similar weathering steel; verify minimum thickness ranges |
| Europe | EN 10025-5 | S460J0W (1.8958) | Equivalent strength class; fine grain, weathering, with impact test option |
| China | GB/T 4171 | Q460NH | Chinese high-strength weathering steel; comparable strength and corrosion resistance |
JIS G3114 SMA570P Weather Resistant Steel Plate Application Introduction
SMA570P is intended for painted welded structural applications exposed to the atmosphere. Thanks to its alloy content, it develops a stable oxide layer that reduces corrosion rate, and the high strength permits lighter structures. The steel can be welded by conventional methods, but proper preheating and interpass temperatures must be maintained.
Typical usage sectors:
Product Applications: Welded plate girders, Fabricated box sections, Heavy columns and trusses, Container side panels and frames, Railway wagon bodies
Processed into products: Flanges and webs of welded beams, Gusset plates and splices, Base plates and stiffeners, Container corner castings and rails, Fatigue-loaded nodes in bridges
Application industries: Bridge construction (girders, cross beams, stiffeners), Building and civil engineering (structural frames, columns, beams), Railway vehicle manufacturing (bogies, underframes), Container and shipping (dry cargo containers exposed to weather), Port and offshore structures (walkways, cranes)
JIS G3114 SMA570P Weather Resistant Steel Plate Similar / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3114 | SMA570W | Weathering steel for unpainted application; higher impact toughness guaranteed, similar strength |
| Japan | JIS G3114 | SMA490P | Lower strength (tensile 490–610 MPa), otherwise comparable weathering properties |
| Europe | EN 10025-5 | S355J2W (1.8965) | Lower strength class, but widely available weathering steel; often used where high strength is not critical |
| USA | ASTM A588 / A588M | Grade (various) | General weathering steel (yield ≥345 MPa); lower strength, but excellent corrosion resistance |
Notes:
For thicknesses above 160 mm, apply JIS G3136 SN steel or consult the manufacturer. All welding shall follow JIS Z 3605 (welding consumables for atmospheric corrosion resisting steel) or equivalent. When used in unpainted condition, SMA570W is recommended. Surface preparation prior to painting must remove mill scale for optimal adhesion.
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