Bethlehem Steel BETHSTAR Grade 80, killed steel

Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate Product Information -:- For detailed product information, please contact sales. -: Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate Synonyms -:- For detailed product information, please contact sales. -:

Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate Product Information -:- For detailed product information, please contact sales. -: ## **Product Datasheet: Bethlehem Steel BETHSTAR® Grade 80 Killed Steel Plate** **Product Overview** Bethlehem Steel BETHSTAR® Grade 80 represents the premium, high-performance tier of the BETHSTAR® family, engineered as a **fully killed**, high-strength low-alloy (HSLA) steel plate. Designed to deliver an exceptional 80 ksi minimum yield strength, this grade combines robust mechanical properties with the superior internal soundness and enhanced toughness inherent to killed steel practice. It is specifically formulated to meet the demands of the most critical structural and heavy equipment applications where maximum strength-to-weight ratio, fatigue resistance, and weldability are non-negotiable. This plate is commercially available in thicknesses ranging from **1/4 inch (6.4 mm) to 3/4 inch (19.1 mm)**. **Key International Standards & Specifications** BETHSTAR® Grade 80 was Bethlehem Steel's proprietary, high-strength specification that often exceeded the requirements of common published standards, positioning it as a premium alternative. * **Primary Performance Benchmark:** **ASTM A572 Grade 65** (A572 does not standardize an 80 ksi grade; BETHSTAR 80 provided a higher-strength proprietary option). * **Closest Standard Equivalent:** **ASTM A656 Grade 80** (High-Strength Low-Alloy Plate with Improved Formability). BETHSTAR 80 shared similar strength and formability goals with the added assurance of killed steel practice. * **Also Conforms To:** Relevant requirements of **ASTM A6** for structural steel plates, typically invoked with Supplementary Requirements for impact testing (S1), maximum carbon equivalent (S5), and through-thickness testing (S4) where applicable. * **Industry Application:** Widely specified by original equipment manufacturers (OEMs) in sectors requiring a certified, weldable 80 ksi plate with guaranteed killed steel quality and traceability. **Chemical Composition (Typical, Weight %)** The chemistry is meticulously balanced with strategic microalloying to achieve high strength through grain refinement and precipitation hardening, while tight control of impurities ensures weldability and toughness. | Element | Typical BETHSTAR® Grade 80 Aim / Range | Key Purpose | | :--- | :--- | :--- | | **Carbon (C)** | 0.12 - 0.18% | Base strength; aggressively controlled for optimal weldability at high strength. | | **Manganese (Mn)** | 1.20 - 1.60% | Solid solution strengthening and hardenability control. | | **Phosphorus (P)** | ≤ 0.020% | Impurity control for enhanced toughness. | | **Sulfur (S)** | ≤ 0.008% | Very low sulfur for superior through-thickness ductility and impact resistance. | | **Silicon (Si)** | 0.15 - 0.35% | Primary deoxidizer (killed steel), contributes to strength. | | **Columbium (Cb/Nb)** | 0.03 - 0.06% | Primary grain refiner and precipitation strengthener. | | **Vanadium (V)** | 0.05 - 0.10% | Significant precipitation strengthening, often used synergistically with Nb. | | **Aluminum (Al), Total** | ≥ 0.025% | Critical for fine austenite grain size (killed steel practice). | | **Nitrogen (N)** | Controlled | Optimized for microalloy carbonitride formation. | | **Carbon Equivalent (C.E. IIW)** | Typically 0.45 - 0.52 | Managed to balance high strength with acceptable weldability, requiring controlled procedures. | **Physical & Mechanical Properties** | Property | Minimum Requirement / Target | Typical BETHSTAR® Grade 80 Performance | | :--- | :--- | :--- | | **Yield Strength (Min)** | 80 ksi (552 MPa) | 85 - 95 ksi (586 - 655 MPa) | | **Tensile Strength** | 95 ksi (655 MPa) Min | 100 - 110 ksi (690 - 759 MPa) | | **Elongation in 2" (Min)** | 14% | 15 - 18% | | **Yield-to-Tensile Ratio** | -- | Typically 0.85 - 0.88 | | **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | ~29,000 ksi (200 GPa) | | **Density** | 0.284 lb/in³ (7.85 g/cm³) | 0.284 lb/in³ (7.85 g/cm³) | | **Notch Toughness (Typical)** | Often specified per customer design (e.g., 20-30 ft-lb @ -20°F) | Excellent for its strength class, with reliable Charpy V-Notch values at low temperatures due to fine-grained, killed microstructure. | | **Key Feature** | **High-Strength Killed Integrity:** Delivers 80 ksi yield strength with the consistent internal quality, reduced segregation, and improved through-thickness ductility of a fully killed steel, essential for highly constrained, critical welds. | **Product Applications** BETHSTAR® Grade 80 was reserved for the most highly stressed components in severe-service applications, where material failure is not an option. * **Extreme-Duty Mobile Equipment:** Critical weldments in excavator boom/handle assemblies, crane jib and boom chords, and main frames for the largest mining and earthmoving machinery. * **Heavy Haul & Specialized Transportation:** High-stress frame sections, kingpins, and upper coupler assemblies for severe-service dump trucks, logging trucks, and specialized heavy haul trailers. * **Lifting & Rigging:** Components for heavy-lift crane hooks, shackles, and spreader bars where weight savings directly increase payload capacity. * **Energy & Industrial Machinery:** Chassis and pivotal structural members for mobile drilling rigs, heavy-duty presses, and large industrial robots. * **Infrastructure & Defense:** Critical components in movable bridges, military vehicle armor support structures, and other high-integrity applications. **Advantages & Fabrication Notes** * **Optimized Weldability for its Strength:** While requiring strict procedure control (low-hydrogen processes, preheat, and often post-weld heat treatment for thick sections), its chemistry was designed to be as weldable as possible for an 80 ksi plate. Proper technique is paramount. * **Superior Toughness & Consistency:** The killed steel process ensures exceptional internal soundness, minimizing laminations and providing reliable, uniform toughness throughout the plate, which is critical for dynamic load applications. * **Good Formability for High Strength:** Capable of moderate cold bending and forming operations when appropriate radii are used, leveraging its fine-grained microstructure. * **Proven OEM Solution:** Served as a trusted, mill-certified material for demanding OEM specifications where material properties and traceability were critical to design validation. * **Legacy Product Note:** BETHSTAR® was a proprietary brand of Bethlehem Steel. Modern equivalents include proprietary 80 ksi HSLA grades from contemporary producers (often designated as HSLA 80 or similar) and performance-matched grades like ASTM A656 Grade 80, typically produced via state-of-the-art Thermomechanical Controlled Processing (TMCP). **Disclaimer:** This datasheet describes the historical **Bethlehem Steel BETHSTAR® Grade 80** product. For current projects requiring 80 ksi yield strength with killed steel quality, engineers should specify performance requirements (min YS 80 ksi, killed/fine-grained, Charpy impact values) and engage with modern steel producers to identify a suitable equivalent grade, supported by current Mill Test Certification and specific welding procedure recommendations. -:- For detailed product information, please contact sales. -: Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate Specification Dimensions Size： Diameter 20-1000 mm Length <4661 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 BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate Properties -:- For detailed product information, please contact sales. -:

Applications of Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate -:- For detailed product information, please contact sales. -: Chemical Identifiers Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed steel plate -:- For detailed product information, please contact sales. -:

Packing of Bethlehem Steel BETHSTAR Grade 80 1/4 to 3/4 in. thick, killed 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 1132 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