JIS G3114 SMA400AP Weather Resistant Steel Plate
JIS G3114 SMA400AP Weather Resistant Steel Plate - Full Data Sheet & Equivalents
Complete material properties for SMA400AP steel plate as per JIS G3114, including chemical composition, mechanical and physical properties, international equivalents, and application guide.
Available as hot-rolled, suitable for subsequent cold forming, shearing, cutting, welding, and painting.
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JIS G3114 SMA400AP Weather Resistant Steel Plate Introduction
SMA400AP is a hot-rolled atmospheric corrosion resisting steel for welded structures, specified in JIS G3114. The suffix 'P' indicates the plate is intended primarily for painted use, enabling enhanced durability in corrosive environments. It belongs to the SMA400A strength class with a minimum tensile strength of 400 MPa and a minimum yield strength of 245 MPa for thicknesses up to 16 mm. The steel contains alloying elements such as copper, chromium, and optionally nickel, which create a protective patina and improve weather resistance. Key features:
- Excellent corrosion resistance in atmospheric exposure, particularly when painted
- Good weldability for structural fabrication
- Balanced strength and ductility for a wide range of applications
- Cost-effective solution for bridges, buildings, and industrial structures exposed to weather
JIS G3114 SMA400AP Weather Resistant Steel Plate Chemical Composition
The chemical composition conforms to JIS G3114 for grade SMA400AP. The steel is alloyed with copper, chromium and nickel to impart enhanced atmospheric corrosion resistance. Elements not listed shall not be intentionally added without the purchaser's consent.
- C, Si, Mn provide base strength and deoxidation.
- P and S are controlled to harmful levels.
- The combination of Cu, Cr, and Ni allows the formation of a protective oxide layer.
| Element | Standard Value (%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.18 | Ladle analysis |
| Silicon (Si) | 0.15 – 0.65 | |
| Manganese (Mn) | ≤ 1.25 | |
| Phosphorus (P) | ≤ 0.035 | |
| Sulfur (S) | ≤ 0.035 | |
| Copper (Cu) | 0.30 – 0.50 | Essential for weather resistance |
| Chromium (Cr) | 0.45 – 0.75 | Essential for weather resistance |
| Nickel (Ni) | 0.05 – 0.30 | Optional, may be added to improve toughness and corrosion resistance. If added, content shall be within this range. |
JIS G3114 SMA400AP Weather Resistant Steel Plate Physical, Thermal and Electrical Properties
The following physical properties are typical for low-alloy steel grades and can be used for design calculations. Actual values may vary slightly depending on processing and exact composition. The values are valid at room temperature unless otherwise noted.
- Density, modulus of elasticity and Poisson's ratio are consistent with structural steel.
- Thermal expansion coefficient and thermal conductivity are provided for common temperature ranges.
| Property | Typical Value | Unit | Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Ambient temperature |
| Modulus of Elasticity (E) | 200–210 | GPa | Tensile modulus, room temperature |
| Shear Modulus (G) | 77–81 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29–0.30 | - | Elastic range, room temperature |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/K | 20–100°C; 12.1 for 20–200°C |
| Thermal Expansion Coefficient (α) | 12.8 | 10⁻⁶/K | 20–400°C |
| Thermal Conductivity (λ) | 53 | W/(m·K) | At 20°C; slightly lower at elevated temperatures |
| Specific Heat Capacity (c) | 460–480 | J/(kg·K) | At room temperature |
| Electrical Resistivity (ρ_e) | 0.14–0.18 | µΩ·m | At 20°C |
JIS G3114 SMA400AP Weather Resistant Steel Plate Mechanical Properties
Tensile properties are in accordance with JIS G3114. Specimens are taken in the transverse direction. Elongation values depend on the test piece used. For plate thickness ≤5 mm, JIS No.5 test piece (gauge length 50 mm, diameter 14 mm); for thickness >5–16 mm, JIS No.1A test piece (gauge length 200 mm, diameter 20 mm) or No.14A (50 mm gauge) may be used by agreement. Bending test is mandatory. Impact test is not required for SMA400AP (class A) unless specially agreed.
- Yield strength (ReH) and tensile strength (Rm) are valid for thickness up to 100 mm; values for thickness >100 mm shall be agreed between manufacturer and purchaser.
- Elongation requirements for thickness >16 mm are specified separately.
| Property | Standard Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 245 | MPa | Thickness ≤16 mm |
| Yield Strength (ReH) | ≥ 235 | MPa | 16 mm < thickness ≤ 40 mm |
| Yield Strength (ReH) | ≥ 215 | MPa | 40 mm < thickness ≤ 100 mm |
| Tensile Strength (Rm) | 400 – 540 | MPa | Thickness ≤ 100 mm |
| Elongation (A) | ≥ 17 | % | Thickness ≤5 mm, JIS No.5 test piece |
| Elongation (A) | ≥ 21 | % | 5 mm < thickness ≤ 16 mm, JIS No.1A test piece |
| Elongation (A) | ≥ 17 | % | 16 mm < thickness ≤ 50 mm, JIS No.1A test piece; for thickness >50 mm elongation is 1% higher per 25 mm increment |
| Bend Test (180°) | No cracks on outer surface | Thickness ≤16 mm: bend diameter = 1.5t; thickness >16 mm: bend diameter = 2.0t | |
| Impact Energy (KV) | Not specified | J | SMA400AP does not require impact testing; if needed, requirements must be agreed. |
JIS G3114 SMA400AP Weather Resistant Steel Plate Directly Equivalent Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JIS G3114 | SMA400AW | Unpainted use; identical chemical and mechanical requirements except intended for bare application; fully interchangeable in terms of strength and composition. |
| Japan | JIS G3114 | SMA400A | Base grade without suffix; properties same as SMA400AP, but may be supplied without the explicit painted-use designation. |
JIS G3114 SMA400AP Weather Resistant Steel Plate Application Introduction
SMA400AP is ideal for steel structures that will be painted and exposed to moderate atmospheric corrosion. Its weather resistance is derived from a protective oxide layer that, when combined with a properly maintained paint system, significantly extends service life. It is readily weldable with standard carbon steel procedures, making it a cost-effective choice for infrastructure and industrial applications. Typical end-use sectors and products include:
Product Applications: Welded steel bridge girders and box sections, Railway wagons and locomotive frames, ISO shipping containers and swap bodies, Industrial ductwork and chimneys, Poles and lattice towers for power lines, Prefabricated building panels and column systems
Processed into products: Bridge deck plates and stiffeners, Main beams, cross beams, and bracings, Container corner posts, side panels, and roof bows, Structural tubular sections and hollow profiles, Connection plates, gussets, and splices, Welded built-up H-sections and I-beams for heavy structures
Application industries: Bridge engineering, Railway rolling stock manufacturing, Container fabrication (shipping containers, storage tanks), Industrial plant construction (frames, conveyors, exhaust stacks), Transmission towers and telecommunication structures, Architectural metalwork (facades, roofing, canopies)
JIS G3114 SMA400AP Weather Resistant Steel Plate Similar / Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10025-5 | S355J0WP | Higher yield strength (≥355 MPa) and tensile strength (470–630 MPa) with similar weathering alloy concept; suitable for painted applications. Requires adjustment in design. |
| Europe | EN 10025-5 | S355J2WP | As S355J0WP but with improved low-temperature impact properties; strength higher than SMA400AP. |
| USA | ASTM A588/A588M | Grade A | Yield strength ≥345 MPa, tensile ≥485 MPa; widely used for welded bridges and structures; strength level higher than SMA400AP; Cu–Cr–Ni alloying similar. |
| USA | ASTM A242/A242M | Type 1 | Yield strength ≥345 MPa for thickness ≤20 mm; atmospheric corrosion resistance roughly 4 times carbon steel; can be used as substitute with design review. |
| China | GB/T 4171 | Q295NH | Yield strength ≥295 MPa, tensile 430–560 MPa; closely matches strength level of SMA400AP; contains Cu, Cr, Ni for weathering. |
| China | GB/T 4171 | Q355NH | Higher strength (yield ≥355 MPa, tensile 490–630 MPa); other weather resistant grades with similar alloying. |
Notes:
This data represents the standard requirements of JIS G3114 for SMA400AP. Special agreements regarding impact properties, restrictions on Ni, or tighter chemistry may be arranged at the time of order. The plate shall be free from detrimental surface defects; ultrasonic testing can be specified. Welding consumables should match the base material weathering properties (e.g., use of Cu–Ni–Cr containing electrodes). For prolonged service in aggressive environments, a suitable high-durability paint system is recommended. The values in physical properties table are typical for structural weathering steels and are not mandatory requirements of the standard.
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