ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil
Detailed material properties for ASME SA633/SA633M Grade C carbon and low-alloy high-strength steel coil: chemical composition, mechanical and physical data, equivalent standards, and application guide.
Hot rolling, Normalizing, Cold forming, Welding, Flame cutting, Machining
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ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Introduction
ASME SA633/SA633M Grade C is a normalized, high-strength low-alloy structural steel supplied primarily in coil and plate form. It combines a fine-grained microstructure with excellent weldability and toughness for heavy-duty welded constructions. The alloy features
- Minimum yield strength of 345 MPa (50 ksi) in thicknesses up to 65 mm
- Carbon content limited to 0.20% for superior weldability
- Controlled manganese and silicon for strength and deoxidation
- Optional copper addition (≥0.20%) when atmospheric corrosion resistance is specified
Normalizing refines the grain, reduces internal stresses, and ensures consistent properties across large-tonnage coils. This grade is widely adopted in bridge building, offshore structures, heavy machinery, and pressure vessel components where reliability under static and dynamic loads is critical.
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Chemical Composition
The chemical composition is controlled to ensure the desired strength-toughness balance and weldability. Carbon equivalent (CE) values are often restricted by supplementary requirements to further improve weldability. The copper content is applicable only when copper-bearing (atmospheric corrosion resistant) steel is specified.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.20 | Maximum for weldability |
| Manganese (Mn) | 1.15 – 1.50 | Primary strengthener |
| Phosphorus (P) | ≤0.035 | Residual element |
| Sulfur (S) | ≤0.040 | Controlled for toughness |
| Silicon (Si) | 0.15 – 0.50 | Deoxidizer and strengthener |
| Copper (Cu) | ≥0.20 (when specified) | Optional for improved atmospheric corrosion resistance; otherwise residual ≤0.35 |
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Thermal and Electrical Physical Properties
Representative physical data for low‑alloy structural steel in the normalized condition. Values are typical and may vary slightly depending on exact chemistry and processing. These figures apply at room temperature unless noted otherwise.
| Physical Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 205 | GPa | Ambient, tensile |
| Shear Modulus (G) | 80 | GPa | Ambient, torsional |
| Poisson's Ratio (ν) | 0.30 | — | Elastic range |
| Thermal Expansion Coeff. (α) | 11.7 ×10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal Expansion Coeff. (α) | 12.5 ×10⁻⁶ | K⁻¹ | 20 – 200 °C |
| Thermal Expansion Coeff. (α) | 13.6 ×10⁻⁶ | K⁻¹ | 20 – 400 °C |
| Thermal Conductivity (λ) | 48 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cₚ) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρₑ) | 0.17 ×10⁻⁶ | Ω·m | 20 °C |
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Mechanical Properties
Tensile and bend properties are validated on normalized test specimens. Impact toughness may be verified when supplementary requirement S5 is invoked; without it, Charpy V-notch values are not mandatory. The values below represent the standard requirements for plates or coils. Bend test uses 180° guided bend, and the mandrel diameter depends on thickness and specimen orientation.
| Property | Standard Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH, min) | 345 | MPa (ksi: 50) | Thickness ≤ 65 mm (>20 to 65 mm same) |
| Yield Strength (ReH, min) | 315 | MPa (ksi: 46) | Thickness > 65 to 100 mm |
| Tensile Strength (Rm) | 485 – 620 | MPa (70 – 90 ksi) | Thickness ≤ 65 mm |
| Tensile Strength (Rm) | 450 – 585 | MPa (65 – 85 ksi) | Thickness > 65 to 100 mm |
| Elongation (A, 200 mm gauge) | ≥18 | % | Thickness ≤ 40 mm, 8 in. gauge plate-type specimen |
| Elongation (A, 50 mm gauge) | ≥23 | % | Thickness > 40 mm, 2 in. gauge rectangular specimen |
| Bend Test (180°) – mandrel diameter | 3t | mm (t = specimen thickness) | Thickness ≤ 25 mm, transverse bend |
| Bend Test (180°) – mandrel diameter | 4t | mm | Thickness > 25 mm or longitudinal bend |
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Identical Material Standards and Direct Substitute Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| United States | ASTM A633/A633M | Grade C | Identical to ASME SA633/SA633M – completely interchangeable |
| — | — | — | No other national/international standard provides a chemically and mechanically exact match. |
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Application Introduction
ASME SA633 Grade C steel is engineered for heavy welded fabrications that must retain high strength and impact toughness after normalizing. It is preferred when superior notch toughness and uniformity through-thickness are essential.
- Combines easy weldability with low carbon content
- Suitable for all common welding processes with low-hydrogen practices
- Good cold-formability allows bending to tight radii
- Normalized state removes residual stresses from hot rolling
Product Applications: Welded plate girders and truss bridges, Offshore platform legs, decks, and nodes, Crane booms, masts, and slewing rings, High-rise building columns and heavy H-beams, Penstock pipes and penstock liners, Heavy-duty dump truck bodies and excavator frames
Processed into products: Flanges and webs of built-up beams, Stiffener plates and diaphragm connectors, Lifting lugs and pad eyes, Gusset plates and splice plates, Base plates and pin-connection forgings (when formed from plate), Circular and rectangular hollow sections (when rolled from coil)
Application industries: Bridge and infrastructure engineering, Offshore and marine engineering, Heavy equipment and crane construction, Building and industrial frame systems, Pressure vessel and storage tank fabrication, Mining and earth-moving machinery
ASME SA633 Grade C Normalized High-Strength Low-Alloy Steel Coil Similar / Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| Europe | EN 10025-3 | S355N | Normalized fine-grain steel, min YS 355 MPa; verify CEV and toughness |
| Japan | JIS G3106 | SM490A | Higher Mn content, similar YS range; widely used in welded structures |
| China | GB/T 19879 | Q345GJ | High-performance building structural steel; consult for Z-direction properties |
| International | ISO 4950-2 | E355DD | High-strength flat products; delivery condition normalized, similar yield strength |
Notes:
Supplementary requirements (e.g., S5 Charpy V-notch testing, S2 product analysis) are often specified by end users. Carbon equivalent (CE) is normally restricted to <0.43% to ensure weldability. When copper is added for weathering resistance, the steel can be used unpainted in certain environments. Always consult the full ASME SA633/SA633M standard for current limits and tolerances.
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