Bethlehem Steel ASTM A710 Grade A2, steel

Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate Synonyms -:- For detailed product information, please contact sales. -:

Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: Bethlehem Steel ASTM A710 Grade A2 (>1" to 2") Steel Plate** **Product Overview** Bethlehem Steel ASTM A710 Grade A2 Heavy Plate is an advanced, high-performance structural steel supplied in the fully heat-treated condition, representing the thick-section capability of the unique age-hardening alloy system. As **Grade A, Class 2 (A2)**, this plate is delivered in the **solution heat-treated and precipitation heat-treated (aged) condition**, with its full mechanical properties—including exceptional low-temperature toughness—already developed by the mill. This product is engineered for critical, heavy-section applications where the combination of **65 ksi minimum yield strength**, outstanding fracture resistance at cryogenic temperatures, excellent weldability, and superior atmospheric corrosion resistance is required in a ready-to-fabricate form. It is available in thicknesses from **over 1 inch (25.4 mm) to 2 inches (50.8 mm)**. **Key International Standards** * **Primary Standard:** **ASTM A710 / A710M** - Standard Specification for Low-Carbon Age-Hardening Nickel-Copper-Chromium-Molybdenum-Columbium Alloy Steel Plates. * **Governing Specification:** This product conforms to all requirements for **Grade A, Class 2 (A2)** for the specified thickness range. "Class 2" mandates delivery in the **solution heat-treated and precipitation heat-treated (aged) condition**. * **Heat Treatment Condition:** Condition I (Solution Heat Treated and Precipitation Heat Treated). The heavy plate undergoes controlled solution treatment and aging to ensure uniform through-thickness properties. * **Critical Supplementary Requirements:** For heavy plate applications, the following are typically invoked: * **ASTM A6 S1 (Charpy V-Notch Impact Testing):** Required at designated cryogenic temperatures (e.g., -100°F / -73°C or lower). Testing is performed at the **quarter-thickness (T/4) location**. * **ASTM A6 S4 (Ultrasonic Examination):** Often specified to ASTM A578 Acceptance Level B or better to ensure internal soundness in thick plate. * **ASTM A6 S5 (Fine Austenitic Grain Practice):** Inherently met. **Chemical Composition (Weight % - ASTM A710 Grade A Requirements)** The chemistry is consistent with the Grade A specification, ensuring the age-hardening response and corrosion resistance are maintained in heavy sections. | Element | ASTM A710 Grade A Requirement | Typical Bethlehem Steel Range (A2, Heavy Plate) | | :--- | :--- | :--- | | **Carbon (C)** | 0.07% max | 0.04 - 0.06% | | **Manganese (Mn)** | 0.40 - 0.70% | 0.50 - 0.65% | | **Phosphorus (P)** | 0.025% max | ≤ 0.012% | | **Sulfur (S)** | 0.025% max | ≤ 0.008% (often lower for improved Z-direction properties) | | **Silicon (Si)** | 0.40% max | 0.20 - 0.35% | | **Nickel (Ni)** | 0.70 - 1.00% | 0.80 - 0.95% | | **Chromium (Cr)** | 0.40 - 0.80% | 0.60 - 0.75% | | **Molybdenum (Mo)** | 0.15 - 0.25% | 0.18 - 0.22% | | **Copper (Cu)** | 1.00 - 1.30% | 1.10 - 1.25% | | **Columbium (Cb/Nb)** | 0.02% min | 0.03 - 0.06% | | **Carbon Equivalent (C.E. IIW)** | Very Low (~0.30-0.35) | Typically ~0.32 | **Physical & Mechanical Properties (As-Delivered, Aged Condition)** *Properties are verified at the quarter-thickness (T/4) location. Welding in the aged condition will soften the heat-affected zone (HAZ).* | Property | Requirement (Aged, Class 2) | Typical Performance (Aged, at T/4) | | :--- | :--- | :--- | | **Yield Strength (Min)** | 65 ksi (450 MPa) | 68 - 78 ksi (469 - 538 MPa) | | **Tensile Strength** | 75 - 95 ksi (515 - 655 MPa) | 78 - 88 ksi (538 - 607 MPa) | | **Elongation in 2" (Min)** | 22% | 22-28% | | **Charpy V-Notch Toughness (As-Aged, at T/4)** | Excellent; Often specified ≥ 40 ft-lb @ -100°F (-73°C) or better. | Maintains its legendary toughness even in the core of thick plate, a key advantage over many quenched & tempered steels. | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | ~29,000 ksi (200 GPa) | | **Density** | ~0.285 lb/in³ (7.87 g/cm³) | Slightly higher than carbon steel. | | **Atmospheric Corrosion Resistance** | Superior to carbon steel | Approximately 2 times the corrosion resistance of carbon steel. | | **Key Feature** | **Heavy-Section Cryogenic Integrity:** Delivers certified high strength and unparalleled low-temperature toughness through the entire cross-section of plate up to 2 inches thick, in a condition ready for heavy fabrication, making it a premier choice for critical cryogenic infrastructure. | **Product Applications** This heavy A710 Grade A2 plate is specified for the primary load-bearing elements in large-scale, low-temperature, and critical service structures. * **Base-Load LNG Infrastructure:** Inner tank shell plates, dome sections, and critical thick welds for above-ground full-containment LNG storage tanks. * **Arctic Offshore Platforms:** Heavy node joints, module support frames, and ice-breaking structures requiring guaranteed toughness at extreme temperatures. * **Heavy Pressure Vessels & Reactors:** Shell courses for large-diameter reactors in petrochemical and syngas service, especially where H₂S resistance (HIC/SSC) is required. * **Advanced Nuclear Components:** Thick-section containment liners and structural supports. * **Specialized Cryogenic Processing Equipment:** Large vacuum-jacketed vessels and transfer lines. **Advantages & Fabrication Notes** * **Weldability with Critical HAZ Management:** Its low carbon equivalent makes it highly weldable even in thick sections, requiring only moderate preheat. However, welding on aged plate creates a distinct soft HAZ. For heavy, restrained welds in primary load paths, a **local post-weld aging treatment (PWAT)** is often **mandatory** to restore strength and toughness in the weld zone. Procedure qualification is essential. * **Elimination of Full-Component Aging:** Unlike Class 1 material, the fabricator is not responsible for finding a furnace large enough to age an entire massive assembly, simplifying logistics for large projects. * **Unmatched Toughness Consistency:** The age-hardening process is less sensitive to through-thickness cooling rate variations than quenching, promoting exceptional toughness uniformity from surface to centerline. * **Fabrication Considerations:** Cold forming is possible but requires greater force. Thermal cutting (plasma, laser) is preferred. Any hot-forming would destroy the aged properties, requiring a full re-solution treatment and re-aging cycle. * **Legacy & Modern Context:** Bethlehem was a pioneer in producing this grade in heavy thicknesses. It remains a specialty product today, with modern equivalents available as **ASTM A710 Grade A Class 2** from select global plate mills. It is often compared to **ASTM A203 Grade D/E** (nickel steel) for cryogenic service but offers higher strength and different fabrication advantages. **Disclaimer:** This datasheet describes the historical **Bethlehem Steel** product meeting **ASTM A710 Grade A, Class 2** in heavy plate. Current procurement requires precise specification: **Grade A Class 2, thickness range, and mandatory Charpy impact requirements at the T/4 location.** Crucially, the **welding and post-weld heat treatment strategy must be defined in the project specification.** Engineering Critical Assessment (ECA) may be required to determine if HAZ softening is acceptable or if local PWAT is needed. Mill Test Certificates must verify heat treatment and include through-thickness tensile and impact data. Fabrication procedures must be qualified on the specific thickness and include any planned PWAT cycles. -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate Specification Dimensions Size： Diameter 20-1000 mm Length <4682 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 A710 Grade A2 >1 to 2 in. thick, steel plate Properties -:- For detailed product information, please contact sales. -:

Applications of Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel plate -:- For detailed product information, please contact sales. -:

Packing of Bethlehem Steel ASTM A710 Grade A2 >1 to 2 in. thick, steel 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 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 1153 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