ASME SA573/SA573M Grade 58 Structural Carbon Steel
ASME SA573/SA573M Grade 58 Carbon & Low-Alloy High-Strength Steel Coil Data Sheet
Comprehensive technical data for ASME SA573/SA573M Grade 58 steel coil: chemical composition, mechanical properties, physical properties, global equivalents, and application guidance.
Welding, bolting, riveting, hot-dip galvanizing, flame cutting, cold forming, bending, machining
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ASME SA573/SA573M Grade 58 Structural Carbon Steel Introduction
ASME SA573/SA573M Grade 58 is a carbon and low-alloy high-strength structural steel supplied as hot-rolled coils and cut plates. It is primarily designed for welded, bolted, and riveted structures where notch toughness at low temperatures is not a mandatory requirement. The steel offers a minimum yield strength of 32 ksi (220 MPa) and tensile strength in the range of 58–71 ksi (400–490 MPa). Its good weldability, formability, and consistent mechanical properties make it a cost-effective choice for general structural applications. The specification corresponds to ASTM A573/A573M Grade 58 and is widely used in building frames, bridges, storage tanks, and machinery parts.
ASME SA573/SA573M Grade 58 Structural Carbon Steel Chemical Composition
The ladle analysis conforms to ASME SA573/SA573M. Grade 58 is a fully killed fine-grain practice is optional unless specified. Copper addition (min 0.20%) is required only when copper-bearing steel is ordered for improved atmospheric corrosion resistance.
| Element | Required Value (%) | Remarks |
|---|---|---|
| Carbon (C) | 0.26 max | Applicable for thickness ≤ 40 mm; slightly reduced for thicker sections |
| Manganese (Mn) | 0.60 – 0.90 | May be adjusted for required tensile properties |
| Phosphorus (P) | 0.035 max | Controlled for weldability |
| Sulfur (S) | 0.04 max | Controlled for weldability and ductility |
| Silicon (Si) | 0.15 – 0.40 | Required for deoxidation; limits are per Grade 58, may be 0.15–0.30 for some thicknesses |
| Copper (Cu) | 0.20 min (if specified) | Optional – required only when copper-bearing steel is ordered (atmospheric corrosion resistance) |
ASME SA573/SA573M Grade 58 Structural Carbon Steel Thermal and Electrical Physical Properties
These values are representative for low‑carbon structural steels and not part of the minimum requirements of ASME SA573. They are derived from published data for similar carbon‑manganese steels and may vary slightly with heat treatment and exact chemical composition.
| Property | Typical Value | Unit | Test Conditions / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of Elasticity (E) | 205 | GPa (29.7 × 10³ ksi) | Tension, room temperature |
| Shear Modulus (G) | 80 | GPa (11.6 × 10³ ksi) | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.29 | - | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 (20–100 °C) | µm/(m·°C) | Average value |
| Thermal Expansion Coefficient (α) | 12.5 (20–200 °C) | µm/(m·°C) | Average value |
| Thermal Conductivity (λ) | 52 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | 486 | J/(kg·K) | Between 20 and 100 °C |
| Electrical Resistivity (ρₑ) | 0.16 | µΩ·m | At 20 °C |
ASME SA573/SA573M Grade 58 Structural Carbon Steel Mechanical Properties
Tensile and yield values are specified for flat-rolled products in the as-rolled or normalized condition. Elongation requirements depend on specimen gage length and thickness. Notch impact testing is not mandatory in the base specification but may be ordered as a supplementary requirement.
| Property | Required Value | Unit | Test Conditions |
|---|---|---|---|
| Tensile Strength (Rm) | 58 – 71 (400 – 490) | ksi (MPa) | Transverse or longitudinal test, room temperature |
| Yield Strength (ReH) | 32 (220) min | ksi (MPa) | For plate thickness ≤ 200 mm (8 in.) |
| Elongation (A) in 8 in. (200 mm) | 21 min | % | Thickness ≤ 19 mm (¾ in.) |
| Elongation (A) in 2 in. (50 mm) | 24 min | % | Thickness ≤ 19 mm (¾ in.) |
| Elongation (A) in 2 in. (50 mm) | 23 min | % | Thickness 19–38 mm (¾ – 1½ in.) |
| Elongation (A) in 2 in. (50 mm) | 21 min | % | Thickness 38–51 mm (1½ – 2 in.) |
| Bend Test (180°) | No cracks on outside of bent portion | - | Bend diameter = 1½ × specimen thickness (t); optional order requirement |
ASME SA573/SA573M Grade 58 Structural Carbon Steel Completely Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade/Designation | Remarks |
|---|---|---|---|
| United States | ASME SA573/SA573M | Grade 58 | Identical to ASME specification for pressure boundary structural parts |
| United States | ASTM A573/A573M | Grade 58 | Original ASTM standard; chemically and mechanically identical |
| United States (UNS) | UNS K02302 | K02302 | Unified Numbering System designation for A573 Grade 58 |
ASME SA573/SA573M Grade 58 Structural Carbon Steel Application Introduction
ASME SA573 Grade 58 steel coil is suitable for a wide range of structural and engineering applications where moderate strength, good weldability, and cost efficiency are required. It is typically used in as‑rolled condition and can be easily cut, formed, and joined. The material is not intended for low‑temperature service unless supplemental impact testing is specified. Typical industries and products:
Product Applications: Structural beams, columns, and frames, Bridge girders and deck plates, Storage tanks and silos, Truck chassis and trailer frames, Railway wagon bodies, Piling and sheet piling, Wind turbine towers (non‑critical sections)
Processed into products: Welded connections and gusset plates, Bracket and support plates, Machinery bases and mounting pads, Stiffeners and diaphragms, Flitch plates in timber structures, Bulkhead panels, Agricultural implement parts (plow beams, harrows), Conveyor belt frames
Application industries: Civil engineering and construction, Heavy machinery and equipment manufacturing, Transportation (rail cars, trailers), Pressure vessel and tank fabrication (non‑code or support structures), Agricultural equipment, Shipbuilding (internal structures), Power transmission (towers and poles)
ASME SA573/SA573M Grade 58 Structural Carbon Steel Similar/Nearby Substitute Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| International | ISO 630-2 | E235 (Fe 360) | Slightly lower strength (min YS 235 MPa), similar weldability |
| European Union | EN 10025-2:2019 | S235JR (1.0038) | Comparable carbon‑manganese steel; min YS 235 MPa, TS 360‑510 MPa |
| Japan | JIS G3101:2015 | SS400 | Min TS 400 MPa, no specified YS; widely used as a commercial grade structural steel |
| China | GB/T 700‑2006 | Q235B | Min YS 235 MPa for ≤16 mm, TS 370‑500 MPa; very close in composition and properties |
| India | IS 2062:2011 | E250 (Fe 410 W)A/B | YS 250 MPa, TS 410 MPa; slightly higher strength, equivalent to mild steel |
| United States | ASTM A36/A36M | A36 | Min YS 250 MPa (36 ksi), TS 400‑550 MPa; widely used structural steel with broader strength range |
Notes:
- This steel is subject to supplementary requirement S18 (maximum carbon equivalent) if improved weldability is needed.
- For unpainted exterior applications, copper‑bearing Grade 58 (with Cu ≥ 0.20%) provides approximately twice the atmospheric corrosion resistance of plain carbon steel.
- All data in the "Thermal" section are typical values; actual values should be confirmed for the specific melt and heat treatment condition.
- The product is commonly available in coil form with thickness up to 25 mm (1 in.) and width up to 3050 mm (120 in.), depending on the mill.
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