ASTM A656 Grade 50 (A656GR50) High-Strength Low-Alloy Steel Plate
ASTM A656 Grade 50 (A656GR50) High-Strength Low-Alloy Steel Plate - Complete
Detailed technical data for ASTM A656 Grade 50 (A656GR50) high-strength low-alloy steel plate: chemical composition, mechanical properties, physical properties, international equivalents, and application information.
Shearing, plasma/laser cutting, cold forming, press braking, welding (low-hydrogen procedures), machining
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ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Introduction
ASTM A656 Grade 50 is a hot-rolled, high-strength low-alloy (HSLA) structural carbon steel plate with enhanced formability and weldability. It is designed to provide a minimum yield strength of 50 ksi (345 MPa) while maintaining good ductility and cold-forming characteristics. The controlled chemical composition, with low carbon and micro-alloying elements such as niobium, vanadium, or titanium, allows for fine grain strengthening and precipitation hardening. This grade is used in weight-critical structural applications where strength-to-weight ratio is important. It is delivered in the as-rolled condition unless otherwise agreed, and is suitable for bending, forming, and welding under appropriate practices.
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Chemical Composition
The chemical composition limits for ASTM A656 Grade 50 are per the standard. The steel is aluminum-killed and may contain micro-alloying elements (Nb, V, Ti, etc.) individually or in combination to achieve the required strength. Copper can be specified to provide atmospheric corrosion resistance; when copper is specified, a minimum of 0.20% is required.
| Element | Standard Requirement (wt%) | Remarks |
|---|---|---|
| C (Carbon) | ≤ 0.18 | Maximum |
| Mn (Manganese) | ≤ 1.65 | Maximum |
| P (Phosphorus) | ≤ 0.025 | Maximum |
| S (Sulfur) | ≤ 0.035 | Maximum |
| Si (Silicon) | ≤ 0.60 | Maximum |
| Cu (Copper) | ≥ 0.20 (when specified) | Optional for enhanced corrosion resistance; max not defined but typically ≤0.35 |
| Nb (Niobium) | No specified limit | May be added for grain refinement |
| V (Vanadium) | No specified limit | May be added for precipitation strengthening |
| Ti (Titanium) | No specified limit | May be added for strengthening |
| Al (Aluminum) | Sufficient for killed steel | Typically 0.02% minimum soluble |
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Physical, Thermal, and Electrical Properties
The following properties are typical for ASTM A656 Grade 50 HSLA steel and are not part of the material specification. They are intended for engineering calculations and may vary slightly depending on the exact chemical composition and mill practice.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic Modulus (E) | 205 | GPa | Tension, room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated |
| Poisson's Ratio (ν) | 0.29 | - | Within elastic range |
| Thermal Expansion (α) | 11.7 (20–100°C) | 10⁻⁶/K | Mean coefficient; up to 600°C is approx. 13.8 |
| Thermal Conductivity (λ) | 52 | W/m·K | At 20°C |
| Specific Heat Capacity | 470 | J/kg·K | At 20°C |
| Electrical Resistivity (ρ_e) | 0.16 – 0.22 | µΩ·m | Room temperature |
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Mechanical Properties
Mechanical properties are verified in the as-delivered condition. The tensile test is performed transversely to the rolling direction for plate products. Bend tests are carried out at room temperature to ensure adequate formability. Charpy impact testing is not mandatory unless specified in the purchase order.
| Property | Standard Requirement | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 345 | MPa | Plate thickness ≤ 40 mm (1.5 in.) |
| Yield Strength (ReH) | ≥ 50 | ksi | Plate thickness ≤ 40 mm |
| Tensile Strength (Rm) | 415 – 585 | MPa | Plate thickness ≤ 40 mm |
| Tensile Strength (Rm) | 60 – 85 | ksi | Plate thickness ≤ 40 mm |
| Elongation (A) in 50 mm (2 in.) | ≥ 20 | % | Transverse, gauge length 50 mm |
| Elongation (A) in 200 mm (8 in.) | ≥ 15 | % | Transverse, gauge length 200 mm |
| Bend Test (180°) – thickness ≤ 20 mm | No cracks, bend radius = 1.5t | - | t = plate thickness; mandrel diameter 1.5 times thickness |
| Bend Test (180°) – thickness 20–40 mm | No cracks, bend radius = 2t | - | t = plate thickness; mandrel diameter 2 times thickness |
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Exact Equivalent Material Standards & Substitute Grades
| Country / Region | Standard | Grade / Designation | Remarks |
|---|---|---|---|
| - | ASTM A656/A656M | Grade 50 | Original standard grade |
| - | - | No globally recognized identical equivalent | Other HSLA standards provide similar mechanical properties but differ in chemistry and processing |
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Application Introduction
ASTM A656 Grade 50 steel offers an excellent combination of high strength, good formability, and weldability, making it suitable for a wide range of formed and fabricated structural components. It is often selected for weight-sensitive designs where cost-effective manufacturing is required. Typical applications include:
Product Applications: Welded structural frames and chassis, Trailer beams and cross-members, Boom sections and telescopic arms for cranes, Agricultural equipment parts (plows, harvester bodies), Support structures for solar panels and wind turbines, Formed brackets, gussets, and stiffeners
Processed into products: Bent press-brake parts (channels, angles), Laser-cut profiles with subsequent welding, Formed longitudinal frame rails, Mounting brackets and fabricated mounts, Reinforcement plates in heavy structures
Application industries: Construction and building infrastructure, Transportation (heavy trucks, trailers, rail cars), Agricultural machinery and implements, Mining and earth-moving equipment, Crane and lifting equipment manufacturing
ASTM A656 Grade 50 High-Strength Low-Alloy Steel Plate Comparable / Similar Material Recommendations
| Country / Region | Standard | Grade / Designation | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S355MC | Minimum YS 355 MPa; thermomechanically rolled; similar formability |
| Europe | EN 10025-3 | S355N/NL | Normalized/normalized rolled, YS 355 MPa, but less formability optimized |
| Japan | JIS G3134 | SPFH 540 | Hot-rolled HSLA for automobile structural use, YS 355 min, similar weldability |
| International | ISO 4950-2 | YFe355 | HSLA for structural use, YS 355 MPa, close in concept |
| China | GB/T 1591 | Q345B / Q355B | Common HSLA structural steel, YS 345/355 MPa, widely used, but formability may differ |
Notes:
- A656 Grade 50 may be supplied with copper addition for improved atmospheric corrosion resistance (similar to weathering steel). When copper is not specified, the plate has typical carbon steel corrosion rates.
- Weldability is excellent with low-carbon equivalent (typically ≤0.40 CE IIW), allowing shop and field welding without preheat for moderate thicknesses.
- For thicknesses above 40 mm (1.5 in.), mechanical properties are subject to agreement; the standard's scope is limited to plate up to 1.5 in.
- Tolerances on thickness, width, and flatness should conform to ASTM A6/A6M unless otherwise agreed.
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