ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil - Properties & Equivalents
Comprehensive technical data for ASME SA572/SA572M Grade 50 carbon and low-alloy high-strength steel coil: chemical composition, mechanical & thermal properties, international equivalents, and application guidance.
Hot rolling, controlled rolling, normalizing (optional), cutting, welding, bending, forming, punching, drilling, galvanizing
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ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Introduction
ASME SA572/SA572M Grade 50 is a columbium-vanadium treated, low-alloy, high-strength structural steel in coil form manufactured to the ASME Boiler and Pressure Vessel Code (identical to ASTM A572/A572M Grade 50). It offers a minimum yield strength of 50 ksi (345 MPa) and minimum tensile strength of 65 ksi (450 MPa) with good weldability and notch toughness.
- Supplied in the as‑rolled, controlled‑rolled, or normalized condition.
- Intended for riveted, bolted, or welded construction of pressure vessels, buildings, bridges, and other structural applications where weight reduction and enhanced durability are critical.
- Excellent strength‑to‑weight ratio and improved atmospheric corrosion resistance compared to plain carbon steels.
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Chemical Composition
Heat analysis limits according to ASME SA572/SA572M Grade 50 [345]. Columbium, vanadium, titanium, or nitrogen additions may be used to achieve grain refinement; values shown here are the maximum allowed unless a range is indicated. Copper content of 0.20% minimum when copper steel is specified.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| Carbon (C) | 0.23 max | For all thicknesses |
| Manganese (Mn) | 1.35 max | For plates and bars ≤ 1 in (25 mm); may be higher for thicker sections per specification |
| Phosphorus (P) | 0.04 max | |
| Sulfur (S) | 0.05 max | |
| Silicon (Si) | 0.15 – 0.40 | When silicon‑killed steel is required; otherwise 0.40 max |
| Copper (Cu) | 0.20 min (when specified) | Optional for improved atmospheric corrosion resistance |
| Columbium (Nb) | 0.005 – 0.05* | *Or as necessary to achieve fine‑grain practice |
| Vanadium (V) | 0.01 – 0.15* | Optional grain refiner; total V + Nb not to exceed 0.15% |
| Nitrogen (N) | 0.015 max | Unless combined with strong nitride‑forming elements |
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Thermal & Electrical Physical Properties
Physical properties representative of low‑alloy carbon‑manganese steel at ambient and elevated temperatures. Values may vary slightly with actual composition and processing; they are suitable for engineering calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C (68 °F) |
| Elastic Modulus (E) | 205 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | Within elastic range |
| Thermal Expansion (α) | 11.7 × 10⁻⁶ | /K | Mean coefficient, 20–100 °C |
| Thermal Expansion (α) | 12.5 × 10⁻⁶ | /K | Mean coefficient, 20–200 °C |
| Thermal Expansion (α) | 13.5 × 10⁻⁶ | /K | Mean coefficient, 20–400 °C |
| Thermal Conductivity (λ) | 51.9 | W/(m·K) | At 100 °C |
| Thermal Conductivity (λ) | 44.0 | W/(m·K) | At 300 °C |
| Thermal Conductivity (λ) | 38.5 | W/(m·K) | At 500 °C |
| Specific Heat Capacity | 486 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | ≈ 1.5 × 10⁻⁷ | Ω·m | At 20 °C; varies with temperature |
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Mechanical Properties
Tensile and yield properties as required by ASME SA572/SA572M for structural‑quality material. Values meet or exceed the minimum requirements of the standard. Elongation requirements depend on thickness and specimen orientation; bend test mandates crack‑free bending for acceptance.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 50 | ksi | At room temperature, 0.2% offset or 0.5% under load, all thicknesses |
| Yield Strength (ReH) | ≥ 345 | MPa | At room temperature, metric equivalent |
| Tensile Strength (Rm) | ≥ 65 | ksi | Minimum, all thicknesses |
| Tensile Strength (Rm) | ≥ 450 | MPa | Minimum, metric equivalent |
| Elongation (A) | ≥ 21 | % | In 2 in (50 mm), thickness ≤ 5/8 in (16 mm) |
| Elongation (A) | ≥ 18 | % | In 2 in (50 mm), thickness 5/8 to 1‑1/4 in (16‑32 mm) |
| Elongation (A) | ≥ 16 | % | In 2 in (50 mm), thickness 1‑1/4 to 1‑1/2 in (32‑40 mm) |
| Elongation (A) | ≥ 16 | % | In 8 in (200 mm), all thicknesses where applicable |
| Bend Test | 90° cold bend | 180° free of cracks | Bend diameter = 3× thickness for plate ≤ 1 in; others per specification |
| Charpy V‑notch (KV) | As agreed (e.g. 15 ft·lb at −20°F) | ft·lb / J | Optional supplementary requirement S5/S6; not mandatory |
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Fully Equivalent Material Standards & Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| United States | ASTM A572/A572M | Grade 50 [345] | Identical technical delivery conditions; ASME SA572 adopted from this standard |
| United States | ASME SA572/SA572M | Grade 50 | Original ASME pressure vessel grade |
| Canada | CAN/CSA G40.20/G40.21 | 350W (Type II) | Comparable strength and chemistry; 350W offers 350 MPa yield with equivalent weldability |
| Mexico | NMX‑B‑284 | Grado 50 | National adoption closely matching ASTM A572 Grade 50 |
| International | ISO 4951‑2 | E355DD | High‑strength structural steel with similar carbon‑manganese limits |
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Application Introduction
ASME SA572 Grade 50 steel coil is selected where high strength, good formability, and reliable weldability are needed to reduce section thickness and overall weight.
- Suitable for static and dynamic loads in pressure vessel construction (within the limits of ASME BPVC Section II and VIII).
- Frequently used in structural frameworks, heavy‑duty machinery, and transportation equipment exposed to moderate corrosive atmospheres (copper enhancement optional).
Product Applications: Welded beam columns and girders, Bridge deck panels and gusset plates, Steel pipe piles and sheet piling, Towers (telecom, lighting, wind turbine), Storage tanks and pressure vessels (limited service), Trailer and shipping container frames
Processed into products: Flanges and web plates for built‑up sections, Bracket supports and bearing plates, Cut‑to‑length stiffeners and diaphragm plates, Rolled structural shapes: angles, channels, I‑beams, Heavy‑plate weldments for mining and earthmoving scoops, Backing rings and structural rings for pressure equipment
Application industries: Pressure vessel and boiler manufacturing, Civil and structural engineering (bridges, buildings, stadia), Heavy‑duty machinery and equipment (cranes, bulldozers), Offshore and marine construction, Power generation (wind towers, transmission poles), Railway and automotive industry (bogies, chassis)
ASME SA572/SA572M Grade 50 Carbon and Low-alloy High-strength Steel Coil Similar / Substitutable Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| European Union | EN 10025‑2 | S355JR / S355J0 / S355J2 | 355 MPa yield; J2 offers better low‑temperature impact properties. Suitable substitution when impact requirements are defined. |
| Japan | JIS G3106 | SM490A / SM490B | 490 MPa tensile strength class; typically 325 MPa yield (SM490A) or 365 MPa (SM490B). May require additional toughness verification. |
| China | GB/T 1591‑2018 | Q345B / Q355B | 345–355 MPa yield; widely used structural steel. Slight differences in Mn and microalloy strategy; check CEV for weldability. |
| India | IS 2062 | E350BR / E350C | 350 MPa yield category; closest match for heavy structural applications. |
| Russia | GOST 19281 | 09G2S (09Г2С) | 345 MPa yield; common low‑alloy steel for welded structures. Mechanical properties align well with SA572 Grade 50. |
| Brazil | ABNT NBR 5008 | ASTM A572 Gr 50 | Directly adopts the ASTM grade; materials certified to this standard are interchangeable. |
| Australia/New Zealand | AS/NZS 3678 | Grade 350 | 350 MPa yield structural steel; microalloy additions may differ but performance envelope is comparable. |
Notes:
For applications requiring guaranteed notch toughness (e.g., Charpy at low temperature), supplementary requirements S5 or S6 of ASME SA572/SA572M must be specified at the time of order. Mill test reports (MTRs) are normally supplied with each shipment confirming heat analysis and mechanical test results. Coil material may be susceptible to slight spring‑back during forming; die design should compensate accordingly. Copper‑bearing variants (min. 0.20% Cu) provide at least twice the atmospheric corrosion resistance of plain carbon steel, making them suitable for unpainted applications.
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