ASME SA573 Grade 70 (SA573GR70) Structural Steel Plate Properties
ASME SA573 Grade 70 (SA573GR70) Structural Steel Plate Properties
Detailed technical data for ASME SA573 Grade 70 (SA573GR70) carbon steel plate, including chemical composition, mechanical properties, thermal performance, and equivalent grades for structural engineering applications.
Welding, Bending, Drilling, Machining, Thermal Cutting, Cold Forming
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ASME SA573 Grade 70 Structural Steel Plate Properties Introduction
ASME SA573 Grade 70 (SA573GR70) is a structural carbon steel plate designed for enhanced atmospheric corrosion resistance and improved toughness compared to standard carbon steels. This specification covers carbon-manganese-silicon steel plates intended for structural applications where higher strength and notch toughness are required.
Key Features:
- Excellent balance of strength, ductility, and weldability.
- Superior toughness suitable for moderate and low-temperature service conditions.
- Widely used in heavy structural fabrication, bridges, and storage tanks.
- Can be supplied in as-rolled or normalized conditions.
ASME SA573 Grade 70 Structural Steel Plate Properties Detailed Chemical Composition
The chemical composition of ASME SA573 Grade 70 is strictly controlled to ensure weldability and structural integrity. Key elements:
- Carbon (C): Provides strength, limited to ensure good weldability.
- Manganese (Mn): Enhances strength and toughness, counteracting the brittleness of sulfur.
- Silicon (Si): Acts as a primary deoxidizer, contributing to strength.
The following table represents the heat analysis limits as specified by the ASME SA573 standard.
| Element | Standard Value (Max, %) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.28 (Thickness ≤ 25.4 mm); ≤0.30 (Thickness > 25.4 mm) | Key hardenability and strength element |
| Manganese (Mn) | 0.85 - 1.20 | Strength and toughness enhancer, improves hot workability |
| Silicon (Si) | 0.15 - 0.40 | Deoxidizer, strength contributor |
| Phosphorus (P) | ≤0.035 | Impurity, strictly controlled to maximize ductility and toughness |
| Sulfur (S) | ≤0.04 | Impurity, controlled to avoid hot shortness and improve weldability |
ASME SA573 Grade 70 Structural Steel Plate Properties Thermal and Electrical Physical Properties
This table provides the essential physical properties required for design calculations involving thermal expansion, conductivity, and stiffness.
ASME SA573 Grade 70 exhibits standard carbon steel physical behavior. The values provided below are generic reference data for C-Mn structural steels at ambient temperatures, suitable for engineering calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm3 | 20 °C (Ambient) |
| Modulus of Elasticity (E) | 200 | GPa | 20 °C (Ambient) |
| Shear Modulus (G) | 80 | GPa | 20 °C (Ambient) |
| Poisson's Ratio (ν) | 0.29 | - | 20 °C (Ambient) |
| Thermal Expansion Coeff. (α) | 11.7 | 10-6 / K | 20 - 100 °C |
| Thermal Conductivity (λ) | 52 | W/m·K | 20 °C |
| Specific Heat Capacity | 480 | J/kg·K | 20 °C |
| Electrical Resistivity (ρe) | 0.18 | μΩ·m | 20 °C |
ASME SA573 Grade 70 Structural Steel Plate Properties Key Mechanical Properties
Mechanical properties determine the material's resistance to applied forces. ASME SA573 Grade 70 offers a minimum yield strength of 38 ksi (260 MPa) and good elongation.
Testing Notes:
- Tests are performed on transverse specimens.
- Elongation requirements vary based on specimen gauge length and plate thickness.
- Bend tests are typically not mandatory for this specific grade unless required by supplementary agreement.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Tensile Strength (Rm) | 485 - 620 | MPa | Transverse Test |
| Tensile Strength (Rm) | 70 - 90 | ksi | Transverse Test |
| Yield Strength (ReH) | ≥260 | MPa | Transverse Test |
| Yield Strength (ReH) | ≥38 | ksi | Transverse Test |
| Elongation (A) | ≥17 | % | 200 mm gauge (Thickness ≤ 25.4 mm) |
| Elongation (A) | ≥19 | % | 200 mm gauge (Thickness > 25.4 mm) |
| Elongation (A) | ≥21 | % | 50 mm gauge (Thickness ≤ 25.4 mm) |
| Elongation (A) | ≥23 | % | 50 mm gauge (Thickness > 25.4 mm) |
| Bend Test (Core Diameter) | Not Mandatory | - | Typically 1.5T to 2T if required by supplementary agreement |
ASME SA573 Grade 70 Structural Steel Plate Properties Completely Matching International Equivalent Grades
| Country/Region | Standard | Equivalent Grade | Remarks |
|---|---|---|---|
| USA | ASTM A573/A573M | Grade 70 | Identical chemical composition and mechanical property requirements. |
| European Union | EN 10025 | S275JR / S275J0 / S275J2 | Similar strength bands, but minor chemistry variations. Impact testing (JR/J0/J2) varies. |
| Japan | JIS G3106 | SM400B / SM400C | Close match in tensile and yield strength, though Mn content is generally lower in SM400 series. |
| China | GB/T 1591 | Q275C / Q275D | Comparable yield and tensile strength ranges with enhanced low-temperature toughness (C/D). |
ASME SA573 Grade 70 Structural Steel Plate Properties Application Introduction
ASME SA573 Grade 70 is optimized for structural applications requiring moderate strength, high reliability, and strong notch toughness. Its excellent weldability makes it ideal for large-scale fabrication projects in civil engineering and transportation.
Core Advantages:
- Excellent weldability with standard low-hydrogen electrodes.
- Good machinability and formability.
- Superior corrosion resistance compared to standard A36 steel in mildly corrosive atmospheres.
Product Applications: Steel Building Frames and Skyscrapers, Highway Bridge Girders and Bracing, Bulk Liquid Storage Tanks (Oil, Water, LP Gas), Railway Car Bodies, Underframes, and Hoppers, Platform and Deck Structures
Processed into products: Base Plates for Columns, Structural Stiffeners and Brackets, Gusset Plates for Trusses, Tank Shell Courses and Roof Plates, Welded Built-up Beams and Box Sections
Application industries: Structural Engineering & Construction, Bridge and Highway Infrastructure, Oil and Gas Storage (Tank Farms), Rail Transportation (Locomotives and Cars), Mining and Heavy Machinery Frames
ASME SA573 Grade 70 Structural Steel Plate Properties Closely Related Substitute Materials
| Country/Region | Standard | Similar Grade | Remarks |
|---|---|---|---|
| USA | ASTM A36/A36M | A36 | Lower tensile strength (58-80 ksi). Widely used general structural steel, but lacks the guaranteed toughness of SA573 Gr.70. |
| USA | ASTM A572/A572M | Grade 50 | High-Strength Low-Alloy (HSLA) steel with superior strength (min 65 ksi tensile). Suitable for weight reduction in heavy structures. |
| European Union | EN 10025 | S355JR / S355J0 | Higher strength structural steel (min 470-630 MPa tensile). Excellent for load-bearing welded structures. |
| International | ISO 630 | Fe 430B / C | Standardized structural steel with matching tensile properties. "C" suffix denotes fine-grain practice for better toughness. |
Notes:
While the standard bend test is not mandatory for ASME SA573 Grade 70, it can be ordered as a supplementary requirement (typically 180-degree bend without cracking).
Welding should follow standard procedures for C-Mn steels, typically with preheating applied to thick sections (>40 mm) to prevent hydrogen-induced cold cracking. Post-weld heat treatment (PWHT) is generally not required due to the controlled carbon equivalent, promoting good as-welded toughness.
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