ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil
Detailed material data for ASME SA572/SA572M Grade 42 carbon and low-alloy high-strength steel coil, including chemical composition, mechanical properties, thermal and electrical physical properties, international equivalents, similar materials, and application guide.
Hot rolling, cold forming, welding (all common methods), machining, shearing, punching; suitable for controlled rolling and normalizing when specified
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Introduction
ASME SA572/SA572M Grade 42 is a high-strength low-alloy (HSLA) structural steel specified for use in welded, bolted, or riveted construction of bridges, buildings, and other structures. It is characterized by a minimum yield strength of 42 ksi (290 MPa) in coil form, offering improved strength-to-weight ratio compared to ordinary carbon steels. The alloying elements, primarily manganese, enhance strength while maintaining good weldability and formability. This grade is typically supplied in the hot-rolled condition, with optional heat treatments available to meet specific toughness or formability requirements. It provides reliable performance in structural applications where moderate strength and good ductility are essential, and it serves as a cost-effective alternative for general construction and engineering projects.
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Chemical Composition
The chemical composition of ASME SA572/SA572M Grade 42 is designed to achieve the required strength and weldability. Carbon and manganese are the primary strengthening elements, with maximum limits on phosphorus and sulfur to ensure cleanliness and ductility. Silicon is typically added for deoxidation. Microalloying elements such as vanadium, niobium, or titanium are not required by the base specification but may be present at low levels as incidental additions. The values shown correspond to heat analysis as per ASME SA572/SA572M.
| Element | Maximum (%) | Notes |
|---|---|---|
| Carbon (C) | 0.21 | For plates and coils ≤ 1 in. (25 mm) in thickness. For thickness > 1 in., max C may be 0.22% (refer to standard). |
| Manganese (Mn) | 1.35 | Mn max may be increased to 1.50% if carbon equivalent (CE) requirements are met. |
| Phosphorus (P) | 0.04 | Max limit for heat analysis. |
| Sulfur (S) | 0.05 | Max limit for heat analysis. |
| Silicon (Si) | 0.40 | Max limit; typically 0.15–0.30% for deoxidation. |
| Copper (Cu) | 0.20* | Residual element; not intentionally added. *Minimum when copper steel is specified. |
| Vanadium (V) | — | Not specified; incidental level ≤ 0.08% typically allowed. |
| Niobium (Nb) | — | Not specified; incidental level ≤ 0.05% typically allowed. |
| Titanium (Ti) | — | Not specified; incidental level ≤ 0.05% typically allowed. |
| Nitrogen (N) | — | Not specified; normally ≤ 0.015%. |
| Iron (Fe) | Balance | Remainder |
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Thermal and Electrical Physical Properties
The thermal and electrical properties of ASME SA572/SA572M Grade 42 are consistent with low-carbon steel grades. These values are typical at room temperature unless otherwise noted and may vary with temperature and processing history. They are provided as design guidance, not guaranteed by the material specification.
| Property | Typical Value | Unit | Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic Modulus (E) | 205 | GPa | At 20°C, tension |
| Shear Modulus (G) | 79 | GPa | At 20°C |
| Poisson's Ratio (ν) | 0.29 | — | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/K | 20–100°C |
| Thermal Expansion Coefficient (α) | 12.5 | 10⁻⁶/K | 20–200°C |
| Thermal Expansion Coefficient (α) | 13.8 | 10⁻⁶/K | 20–300°C |
| Thermal Conductivity (λ) | 45 | W/(m·K) | At 20°C |
| Thermal Conductivity (λ) | 42 | W/(m·K) | At 100°C |
| Specific Heat Capacity (cp) | 480 | J/(kg·K) | At 20–100°C |
| Electrical Resistivity (ρe) | 0.22 | µΩ·m | At 20°C |
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Mechanical Properties
Mechanical properties of ASME SA572/SA572M Grade 42 steel coil are determined by tensile testing at room temperature. The yield strength, tensile strength, and elongation values are minimum requirements per the standard. Impact toughness is not a mandatory requirement but may be specified via supplementary clauses (e.g., Charpy V-notch at specified temperatures). Bend test parameters depend on material thickness and orientation.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 290 (42) | MPa (ksi) | Tensile test, transverse (or longitudinal if specified), 0.2% offset method |
| Tensile Strength (Rm) | ≥ 415 (60) | MPa (ksi) | Tensile test, same specimen as yield |
| Elongation in 200 mm (A200) | ≥ 18 | % | For thickness ≤ 20 mm, 200 mm gauge length (8 in.), transverse |
| Elongation in 50 mm (A50) | ≥ 22 | % | For thickness > 20 mm, 50 mm gauge length (2 in.), transverse |
| Bend Test (Bending angle 180°) | No cracks on outside of bent portion | — | Bend diameter = 2a (a = specimen thickness) for thickness ≤ 25 mm; for thicker sections, refer to standard |
| Charpy Impact Energy (KV) | Not required by base specification; may be ordered as supplementary requirement (e.g., 27 J min at 21°C or lower) | J | Charpy V-notch, transverse, size depending on thickness |
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Directly Equivalent Material Standards & Replaceable Designations
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| United States | ASTM A572/A572M | Grade 42 [290] | Identical technical requirements; ASTM A572 Gr42 is the parent standard, ASME adopts it for pressure-retaining and structural applications. |
| United States | ASTM A36/A36M | Grade 36 [250] | When upgraded to 42 ksi yield via supplementary chemistry/microalloying, but not a direct grade-for-grade equivalent. Verify with producer. |
| Canada | CSA G40.21 | 38W | Comparable strength and weldability (38 ksi min yield), often used interchangeably with SA572 Gr42 in North America. |
| International | ISO 4950-2 | S290 | ISO high yield strength flat steel; minimum yield 290 MPa, similar composition range. May be considered equivalent with caution. |
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Application Introduction
ASME SA572/SA572M Grade 42 coil is a versatile structural steel suitable for a wide range of construction and engineering applications. It is primarily used in welded, bolted, or riveted assemblies where moderate strength and good ductility are required. The coil format allows for efficient continuous processing, such as roll forming, tube making, and stamping. It can be easily sheared, punched, and cold-formed within standard limits. Typical end-use products include structural framing members, light-to-medium duty beams, vehicle chassis components, and infrastructure hardware. The material performs well in both static and dynamic loading, making it suitable for bridges, towers, and other dynamically loaded structures. When enhanced toughness is needed, the material can be ordered with supplementary Charpy requirements. Welding follows standard procedures for low-carbon structural steels, with low-hydrogen practices recommended for thick sections.
Product Applications: Structural beams, channels, and angles (hot-rolled from coil slit strip), Welded hollow structural sections (HSS) and pipe, Corrugated steel sheets for roofing and siding, Steel decking for composite floor systems, Automotive chassis and frame rails, Railcar side sills and underframes, Transmission tower legs and crossarms, Agricultural implement frames and booms, High-strength brackets and gussets, Dump truck bodies and trailer components
Processed into products: Bridge girder web and flange plates (moderate load paths), Building column base plates and connection plates, Roof truss members and purlins, Tower leg angles and plates, Automotive longitudinal rails and cross members, Heavy equipment frames and booms, Storage tank shell courses (non-pressure, atmospheric tanks), Spiral and longitudinal welded pipe for piling, Cold-formed C and Z profiles, Pre-engineered metal building frames
Application industries: Bridge and highway construction, Commercial and industrial building, Transmission tower and utility pole manufacturing, Automotive and heavy truck frame components, Railway car and locomotive manufacturing, Agricultural and construction equipment, Shipbuilding and offshore (secondary structures), Storage tanks and pressure vessels (non-code, non-pressure retaining), General steel fabrication and metalworking
ASME SA572/SA572M Grade42 High-Strength Low-Alloy Structural Steel Coil Similar/Comparable Material Recommendations
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| EU | EN 10025-2 | S275JR / S275J0 / S275J2 | S275 has min yield 275 MPa and tensile 410-560 MPa, slightly lower strength but comparable weldability. Use thicker sections for strength equivalence. |
| Japan | JIS G3101 | SS400 | Tensile strength 400-510 MPa; yield strength is lower (~235-245 MPa). Not a direct strength match; upgrade to SM400A/B for better toughness and yield. |
| Japan | JIS G3106 | SM400A/B/C | Minimum yield 245 MPa; SM400 is a common structural steel with similar weldability, but lower strength than Grade 42. |
| China | GB/T 1591 | Q345B | Minimum yield 345 MPa (much higher); not a direct grade-for-grade match but often used in similar applications with adjustment. |
| EU | EN 10025-3 | S275N/NL | Normalized S275 with improved toughness; comparable strength but may be specified as a premium option. |
Notes:
Additional Remarks: ASME SA572/SA572M Grade 42 is identical to ASTM A572 Grade 42 in technical content. When ordering material for critical applications, consider specifying supplementary requirements such as fine grain practice (S5), Charpy V-notch impact testing (S2), or carbon equivalent limits (S79) to improve toughness and weldability. The grade is readily available from North American mills in coil form, often in thicknesses up to 12.5 mm (1/2 in.) for coil and up to 150 mm for plate. For service at elevated temperatures, mechanical properties may degrade; the material is intended for use at ambient temperatures unless specifically qualified. Surface finish is typically as-rolled, with optional pickling and oiling available. All welding should be performed according to AWS D1.1 or equivalent structural welding codes.
- Share
