Bethlehem Steel ASTM A710 Grade A1, steel

Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate Synonyms -:- For detailed product information, please contact sales. -:

Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: Bethlehem Steel ASTM A710 Grade A1 Steel Plate** **Product Overview** Bethlehem Steel ASTM A710 Grade A1 is a premium, high-strength, low-alloy (HSLA) structural steel plate known for its unique combination of high strength, excellent toughness, and superior weldability, achieved through a **precipitation heat treatment (aging)** process rather than traditional quenching and tempering. Classified as a **copper-nickel-chromium-molybdenum-columbium alloy steel**, it utilizes precipitation hardening to develop its mechanical properties after hot-rolling and a solution treatment (annealing). This results in a fine-grained microstructure that delivers outstanding low-temperature impact resistance. This plate is available in a light gauge thickness range from **3/16 inch (4.8 mm) to 5/16 inch (7.9 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 strictly conforms to the requirements for **Grade A**, **Class 1** (A1) as defined in ASTM A710. Class 1 indicates that the plate is supplied in the solution heat-treated (annealed) condition, requiring a subsequent aging treatment by the fabricator to achieve the specified mechanical properties. * **Heat Treatment Condition:** Supplied in the **solution heat-treated (annealed)** condition (Condition III per standard). Final properties are developed by the user through a low-temperature **aging treatment** (typically 1100-1200°F / 593-649°C), which allows for stress-relieving after welding. * **Supplementary Standards:** Often specified with **ASTM A6** supplementary requirements, particularly **S1 (Charpy V-Notch Impact Testing)** at low temperatures. **Chemical Composition (Weight % - ASTM A710 Grade A Requirements)** The lean, low-carbon chemistry, enriched with copper and nickel, facilitates precipitation hardening and provides inherent atmospheric corrosion resistance. | Element | ASTM A710 Grade A Requirement | Typical Bethlehem Steel Range (A1) | | :--- | :--- | :--- | | **Carbon (C)** | 0.07% max | 0.04 - 0.06% | | **Manganese (Mn)** | 0.40 - 0.70% | 0.50 - 0.65% | | **Phosphorus (P)** | 0.025% max | ≤ 0.015% | | **Sulfur (S)** | 0.025% max | ≤ 0.010% | | **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** *Properties are developed after the final aging treatment by the fabricator.* | Property | Requirement after Aging (ASTM A710 Grade A) | Typical Performance / Notes | | :--- | :--- | :--- | | **Yield Strength (Min)** | 65 ksi (450 MPa) | Typically 70 - 80 ksi (483 - 552 MPa) | | **Tensile Strength** | 75 - 95 ksi (515 - 655 MPa) | Typically 80 - 90 ksi (552 - 621 MPa) | | **Elongation in 2" (Min)** | 22% | Typically 24-30% | | **Charpy V-Notch Toughness (Aged)** | Excellent (Often ≥ 40 ft-lb @ -100°F / -73°C) | The hallmark of A710 steel. Exceptional low-temperature toughness is achievable due to the low-carbon, precipitation-hardened structure. | | **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 due to alloy content. | | **Corrosion Resistance** | Superior to carbon steel | The copper and nickel content provides enhanced atmospheric corrosion resistance, approximately 2 times that of carbon steel. | | **Key Feature** | **Age-Hardenable with Superior Toughness:** Offers a unique fabrication advantage: components can be **welded and formed in the soft, solution-treated condition**, then aged to full strength, minimizing distortion and preserving weld zone properties. | **Product Applications** ASTM A710 Grade A1 is specified for critical, high-performance applications where weldability, toughness, and strength are paramount, particularly in low-temperature environments. * **Cryogenic & Low-Temperature Service:** Containers and structural supports for liquefied gases (LNG, liquid ethylene, nitrogen). * **Pressure Vessels & Heat Exchangers:** For severe service where resistance to hydrogen-induced cracking (HIC) and sulfide stress cracking (SSC) is beneficial. * **Offshore & Marine Structures:** Critical node sections and highly stressed components on offshore platforms and Arctic vessels. * **Power Generation:** Components in nuclear and advanced fossil fuel plants requiring high toughness. * **High-Performance Military Applications:** Naval vessel components and armor structures requiring multi-hit capability. **Advantages & Fabrication Notes** * **Exceptional Weldability:** The extremely low carbon content and carbon equivalent make it one of the most weldable high-strength steels available. It can be welded in the solution-treated condition without preheat (for thin sections) and with minimal risk of HAZ cracking. * **Unique Fabrication Sequence:** The standard workflow is: 1) Fabricate (cut, form, weld) in the soft, supplied condition. 2) Perform a single, low-temperature aging heat treatment to strengthen the entire assembly uniformly and stress-relieve welds simultaneously. * **Outstanding Toughness:** Consistently achieves very high Charpy impact values at extremely low temperatures, making it a premier choice for fracture-critical designs. * **Formability:** Excellent in the as-supplied condition due to its soft, ductile state. * **Legacy Product Note:** Bethlehem was a key producer of this advanced steel. Modern equivalents are readily available as **ASTM A710 Grade A, Class 1** from contemporary specialty plate mills. **Disclaimer:** This datasheet describes the historical **Bethlehem Steel** product meeting **ASTM A710 Grade A, Class 1**. For current procurement, it is crucial to specify the exact grade, class (A1 for solution-treated), and required mechanical properties **after aging**. Fabricators must understand and plan for the unique aging heat treatment step. Consult with the steel producer for recommended aging times and temperatures, and ensure the fabricator's heat treater is qualified for the process. Mill Test Certificates will verify chemistry and condition at shipment; final properties are confirmed after the customer's aging treatment. -:- For detailed product information, please contact sales. -: Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate Specification Dimensions Size： Diameter 20-1000 mm Length <4679 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 A1 3/16 to 5/16 in. thick, steel plate Properties -:- For detailed product information, please contact sales. -:

Applications of Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 in. thick, steel plate -:- For detailed product information, please contact sales. -:

Packing of Bethlehem Steel ASTM A710 Grade A1 3/16 to 5/16 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 1150 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