Bethlehem Steel Seamless tube ASTM A529, as-rolled Steel Seamless tube

Bethlehem Steel Seamless tube ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled Steel Seamless tube plate Product Information -:- For detailed product information, please contact sales. -: Bethlehem Steel Seamless tube ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled Steel Seamless tube plate Synonyms -:- For detailed product information, please contact sales. -:

Bethlehem Steel ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled steel plate Product Information -:- For detailed product information, please contact sales. -: # **Bethlehem Steel ASTM A529 Grade 42 (3/16" to 1/2" thick) As-Rolled High-Strength Carbon Steel Plate** --- ## **1. Overview** Bethlehem Steel's **ASTM A529 Grade 42** plate is a **high-strength carbon steel** specifically designed for **structural applications in moderate thicknesses (3/16" to 1/2")**. Supplied in the **as-rolled condition**, this material provides a **42 ksi (290 MPa) minimum yield strength**, offering a significant 17% strength advantage over the ubiquitous ASTM A36 steel (36 ksi). It achieves this higher strength primarily through a carefully balanced carbon-manganese chemistry, without relying on microalloying elements like Columbium or Vanadium. This makes it a cost-effective, readily weldable choice for fabricators seeking to upgrade from A36 for weight savings or increased load capacity in buildings, bridges, and general structures where thickness is limited. **Note:** This grade is often considered a direct, higher-strength alternative to A36 for plate applications, particularly in the building and construction industry. --- ## **2. International Standards** This product conforms to the standard specification for high-strength carbon-manganese steel of structural quality: * **Primary Standard: ASTM A529 / A529M** – Standard Specification for High-Strength Carbon-Manganese Steel of Structural Quality. * **Grade Designation:** **42** (indicating 42 ksi minimum yield strength). There is also a **Grade 50** (50 ksi) within the same specification. * **Key Distinction from HSLA:** Unlike ASTM A572 (HSLA), A529 is a **carbon-manganese steel**, not microalloyed. Its strength comes from higher levels of carbon and manganese, not from additions of Nb, V, or Ti. * **Related Standards:** Often used interchangeably with or as an alternative to **ASTM A36** where higher strength is needed, and to **ASTM A572 Grade 42** (though A572 is microalloyed). --- ## **3. Chemical Composition (Typical, % by Weight)** The chemistry is a classic higher-carbon, higher-manganese formula optimized for strength and rolling response. | Element | Content (Maximum, per ASTM A529) | Role & Implication | | :--- | :--- | :--- | | **Carbon (C)** | **0.27% max** | The primary strengthening element. Higher than A36 (0.25% max), directly contributing to the increased yield strength. This also raises the Carbon Equivalent (CE), affecting weldability. | | **Manganese (Mn)** | **1.20% max** | Higher than A36 (0.80-1.20% typical). Works synergistically with carbon to increase strength and hardenability through solid solution strengthening. | | **Phosphorus (P)** | 0.04% max | Residual; kept low. | | **Sulfur (S)** | 0.05% max | Residual; controlled. | | **Silicon (Si)** | 0.40% max | Deoxidizer (killed steel), contributes to strength. | | **Copper (Cu)** | 0.20% min (when specified) | Optional for enhanced atmospheric corrosion resistance. | | **Key Characteristic:** | **Carbon-Manganese Strengthened.** The strength is achieved through a higher Carbon Equivalent (CE ≈ 0.40-0.46) than A36. This means it is **stronger but slightly less weldable** than A36, requiring more attention to welding procedure. | | --- ## **4. Physical & Mechanical Properties (As-Rolled)** Properties are consistent for this moderate thickness range in the as-rolled condition. | Property | ASTM A529 Grade 42 Specification Minimum | Typical Value (3/16" - 1/2" thick) | | :--- | :--- | :--- | | **Yield Strength (min)** | **42 ksi (290 MPa)** | Typically 42-50 ksi. | | **Tensile Strength** | **60 - 85 ksi (415 - 585 MPa)** | Typically 60-75 ksi. The specified range ensures adequate strain hardening while preventing excessive strength that could hinder forming. | | **Elongation in 2" (min)** | **19%** | Typically 20-25%. Maintains good ductility for structural fabrication. | | **Yield-to-Tensile Ratio** | N/A | Typically 0.70 - 0.75. A favorable ratio indicating good energy absorption capacity. | | **Modulus of Elasticity** | 29,000 ksi (200 GPa) | | | **Notch Toughness** | **Not specified** in the base standard. | Generally adequate for most structural applications but not guaranteed for low-temperature or dynamic loading without supplemental requirements. | | **Surface Finish** | Standard hot-rolled mill finish. | Scale must be removed for painting or critical welding. | --- ## **5. Key Features & Advantages** * **Increased Strength over A36:** Provides a reliable 42 ksi minimum yield strength, enabling lighter designs or higher load capacities compared to structures built with A36. * **Cost-Effective Strength Upgrade:** Often more economical than microalloyed HSLA grades (like A572) while providing a clear strength benefit over A36. * **Good Fabricability:** Maintains good formability and machinability for its strength level. Can be sheared, punched, and cold-formed with standard equipment (requiring slightly more force than A36). * **Predictable Performance:** As a carbon-manganese steel, its behavior during cutting and welding is well-understood and predictable. * **Excellent for Static Structures:** Ideal for building frames, supports, and other primarily statically loaded structures. --- ## **6. Product Applications** ASTM A529 Grade 42 is widely used in structural applications where a step up from A36 is beneficial: * **Building Construction:** Structural members, roof trusses, purlins, and framing where increased strength allows for longer spans or lighter sections. * **Bridge Components:** Cross-frames, diaphragms, connection plates, and other secondary members in highway bridges. * **Industrial Structures:** Support frames, platforms, stair stringers, and mezzanines in factories and warehouses. * **Transmission & Communication Towers:** Leg and bracing members for electrical transmission towers. * **General Fabrication:** Base plates, brackets, and weldments requiring higher load capacity than A36 can provide. --- ## **7. Fabrication & Processing Notes** * **Cutting:** Excellent for all methods: shearing, plasma, laser, and flame cutting. No special precautions needed beyond standard practice. * **Forming:** Good cold formability. Minimum bend radii are slightly larger than for A36 (e.g., 1.5t to 2t for a 90° bend). Springback is more pronounced. * **Welding:** **Weldable, but requires more care than A36 due to higher carbon content.** * **Preheat:** **Recommended for thicknesses over 1/2 inch** and in cold or damp conditions. A preheat of 150-250°F (65-120°C) is good practice to prevent hydrogen-induced (cold) cracking. * **Electrodes/Process:** **Low-hydrogen electrodes (E7018) are strongly recommended** over cellulose (E6010) or rutile (E6013) types. GMAW (MIG) and FCAW are suitable with deoxidized wire. * **Technique:** Avoid high heat input which can excessively soften the heat-affected zone (HAZ). * **Comparison to A36 Welding:** Welding A529 Gr. 42 is similar to welding A36, but the **margin for error is smaller**. Strict adherence to low-hydrogen practices is more critical. --- ## **8. Modern Perspective & Comparison** * **vs. ASTM A36:** **Stronger (42 vs 36 ksi yield).** A529 Gr. 42 is the logical choice when A36 sections are too large or heavy for the design. The small cost premium is often justified by weight savings. * **vs. ASTM A572 Grade 42:** Both have 42 ksi yield. **A572 is microalloyed** (with Nb/V), giving it generally **better toughness and weldability** (lower CE). A529 is a **carbon-strengthened** alternative. For new designs, A572 is often preferred, but A529 remains a valid and cost-competitive option. * **vs. ASTM A992 (for shapes):** A992 is the standard for W-shapes (beams) with a 50 ksi yield. A529 plate is used for plates and bars that complement A992 members in a structure. * **Current Status:** ASTM A529 Grade 42 remains a relevant and specified material, particularly in the construction industry. It is produced by all major plate mills and is readily available from steel service centers. --- **Disclaimer:** *This profile describes a standard structural steel product. Bethlehem Steel is now part of Cleveland-Cliffs Inc.* For procurement and fabrication: 1. Consult the latest **ASTM A529** specification. 2. For welding, follow **AWS D1.1 Structural Welding Code** recommendations for steels with a comparable Carbon Equivalent. 3. A529 Grade 42 is a practical and economical choice for many structural applications. For optimal weldability and toughness, consider **A572 Grade 42** as an alternative. 4. Always review the certified Mill Test Report (MTR) for the specific heat's chemistry and properties. -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled steel plate Specification Dimensions Size： Diameter 20-1000 mm Length <4622 mm Size:We can customized as required Standard： Per your request or drawing We can customized as required Properties（Theoretical） Chemical Composition -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled steel plate Properties -:- For detailed product information, please contact sales. -:

Applications of Bethlehem Steel Seamless tube ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled Steel Seamless tube plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Bethlehem Steel Seamless tube ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled Steel Seamless tube plate -:- For detailed product information, please contact sales. -:

Packing of Bethlehem Steel Seamless tube ASTM A529 Grade 42 3/16 to 1/2 in. thick, as-rolled Steel Seamless tube plate -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Seamless tube drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1093 gallon liquid totes Special package is available on request. E FORUs’ is carefully handled to minimize damage during storage and transportation and to preserve the quality of our products in their original condition