AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA)

AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) Product Information -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) Product Information -:- For detailed product information, please contact sales. -: **Product Name:** AK Steel ASTM A1011, Class 1 Formable, Grade 60K Hot-Rolled High-Strength Low-Alloy Steel (HSLA) --- ### **1. Overview** AK Steel's ASTM A1011 **Grade 60K, Class 1 Formable** represents a cutting-edge achievement in modern steel metallurgy. It pushes the boundaries of hot-rolled sheet performance by delivering an exceptional **minimum yield strength of 60 ksi (415 MPa)** while simultaneously conforming to the most stringent ductility requirements defined by the **Class 1 Formable** designation. This grade stands at the frontier of commercial HSLA technology, engineered for applications where extreme weight reduction, superior structural efficiency, and the ability to undergo significant cold forming are all critical requirements. It is the material of choice for pioneering lightweight designs in transportation and heavy equipment. --- ### **2. International Standards** This product is manufactured to the rigorous requirements of the following specification, achieving its highest practical strength tier for formable hot-rolled sheet: * **ASTM A1011 / A1011M:** Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability. * **Grade:** 60K (Microalloyed HSLA Steel) * **Formability Class:** **Class 1 (Formable).** This designation is critical and signifies the material meets enhanced ductility and tensile property limits, making it suitable for demanding forming operations despite its very high strength. --- ### **3. Chemical Composition (Typical, % by Weight)** The chemistry is an advanced, ultra-low carbon microalloyed design, often utilizing modern metallurgical techniques like Thermomechanical Controlled Processing (TMCP) and microalloy synergies. | Element | Content (Typical / Maximum) | Role & Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.05% - 0.10% max | Extremely low. This is fundamental to achieving the Class 1 formability and excellent weldability. Strength is derived almost entirely from microalloying and precise processing. | | **Manganese (Mn)** | 1.40% - 1.80% | Major solid solution strengthener; essential for hardenability and supporting the microalloy system. | | **Phosphorus (P)** | 0.025% max | Very tightly controlled to maximize ductility and notch toughness. | | **Sulfur (S)** | 0.008% max (typically calcium-treated) | Ultra-low sulfur with calcium treatment for superior sulfide shape control. This is crucial for achieving excellent transverse ductility and through-thickness properties (Z-direction performance) in high-strength forming. | | **Silicon (Si)** | 0.10% - 0.40% | Deoxidizer. | | **Columbium (Cb/Nb)** | **0.04% - 0.08%** | **Critical Microalloy.** Provides powerful grain refinement and precipitation strengthening. | | **Vanadium (V)** | **0.05% - 0.12%** | **Critical Microalloy.** Works synergistically with Nb for potent precipitation strengthening, enabling the 60 ksi strength with minimal carbon. | | **Titanium (Ti)** | 0.01% - 0.03% (often present) | Added for grain refinement, nitrogen fixation, and sulfide modification. | | **Aluminum (Al), Total** | 0.010% min | Grain refiner. | | **Nitrogen (N)** | Very Tightly Controlled | Precisely managed to optimize microalloy carbonitride precipitation. | | **Key Characteristic:** | **Breakthrough Carbon Equivalent (CE).** Typically ≤ 0.42. This represents a metallurgical breakthrough, allowing welding and forming characteristics previously unattainable in 60 ksi yield strength hot-rolled steel. | | --- ### **4. Physical & Mechanical Properties** Properties represent the state-of-the-art balance between ultra-high strength and manufacturability in hot-rolled sheet. | Property | Specification / Typical Range | Description & Significance | | :--- | :--- | :--- | | **Yield Strength (min)** | 60 ksi (415 MPa) | Enables maximum weight reduction and structural efficiency. | | **Tensile Strength** | **75 ksi min, with a strictly controlled maximum** | **Critical Class 1 Feature.** An enforced upper limit (e.g., 85-90 ksi max) ensures a manageable yield-to-tensile ratio for forming. Typically 75-85 ksi. | | **Yield-to-Tensile Ratio (Y/T)** | **Optimized for formability** | Typically 0.80 - 0.88. While higher than lower grades due to inherent strength, it is optimized within Class 1 to allow controlled deformation. | | **Elongation in 2" (min)** | **Exceptionally high for 60 ksi** (e.g., 16-20% min) | **The defining achievement of Class 1.** This guaranteed minimum elongation is what enables forming of this ultra-high-strength material. | | **Modulus of Elasticity** | 29,000 ksi (200 GPa) | | | **Notch Toughness** | **Outstanding.** The advanced TMCP and microalloyed structure (acicular ferrite/bainite) provides excellent low-temperature impact resistance. | Often capable of meeting supplemental toughness requirements (e.g., -20°F / -30°C Charpy V-Notch). | | **Through-Thickness Ductility** | **Superior (with Ca treatment)** | Excellent resistance to lamellar tearing in constrained welded joints, a critical feature for thick, high-strength fabrications. | | **Fatigue Strength** | Very High | Excellent performance under cyclic loading conditions. | --- ### **5. Key Features & Advantages** * **Maximum Lightweighting Potential:** The 60 ksi minimum yield strength enables the most aggressive down-gauging, maximizing payload and fuel efficiency. * **Unprecedented Formability for its Strength:** Class 1 certification means this material can be cold formed into complex shapes that were traditionally only possible with much lower-strength steels or required hot forming. * **Excellent Weldability:** The ultra-low carbon chemistry minimizes preheat requirements and reduces the risk of cold cracking, simplifying fabrication of ultra-high-strength structures. * **Superior Toughness & Fatigue Resistance:** Provides exceptional durability, impact resistance, and longevity in demanding service environments. * **Enables Design Innovation:** Allows engineers to consolidate parts, create more efficient structures, and meet stringent weight targets without sacrificing performance or manufacturability. --- ### **6. Product Applications** This advanced steel is specified for the most challenging, weight-critical structural applications across heavy industries. * **Heavy Truck & Trailer:** Main beams, crossmembers, and fifth wheels for ultra-high-capacity trailers where weight savings directly convert to increased payload revenue. * **Mobile Crane & Aerial Work Platforms:** Critical boom sections, telescoping arms, and structural components where every pound saved increases lifting capacity or working height. * **Mining & Logging Equipment:** Chassis frames, structural members for haul trucks, excavators, and harvesters where equipment weight impacts productivity and cycle time. * **Bus & Commercial Vehicle:** Chassis frames, side pillars, and roll-over protection structures requiring extreme strength and energy absorption. * **Defense & Security Vehicles:** Structural components for armored personnel carriers and tactical vehicles where ballistic protection and mobility depend on high-strength lightweight materials. * **Specialized Transportation:** Components for railcars, container chassis, and heavy transport systems. --- ### **7. Fabrication & Processing Notes** * **Forming:** Requires **powerful, precision tooling**. Cold forming is possible but challenging. Bend radii are large, typically **≥ 4x material thickness (t)**. **Springback is very significant** and must be accurately predicted and compensated for in die design. Stretch forming and draw operations require careful engineering and lubrication. Consultation with the steel producer during tooling design is strongly advised. * **Welding:** Requires **strictly controlled procedures**. Use low-hydrogen processes exclusively (GMAW with 95/5 Ar/CO₂ or 98/2 Ar/O₂, FCAW-G). **Preheat is recommended** (150-250°F / 65-120°C) for most thicknesses to manage hydrogen and residual stress. Use high-toughness filler metals (e.g., E11018-M, ER100S-G). Post-weld heat treatment may be necessary for thick, highly restrained weldments. * **Cutting:** **Laser and plasma cutting are preferred** for clean, hardened-edge-free cuts. Oxy-fuel cutting requires specialized procedures. * **Surface Preparation:** Mill scale must be completely removed via abrasive blasting. * **Handling & Storage:** Material is very high strength; proper handling is required to prevent edge damage or deformation. --- **Disclaimer:** *This profile describes a premium, advanced product. AK Steel is now part of Cleveland-Cliffs Inc.* Grade 60K Class 1 is a specialized material. Success requires **close collaboration** with the producer's technical team from design through production. Always consult the latest **ASTM A1011** standard, the producer's **Technical Data Sheet**, and the certified **Mill Test Report (MTR)**. Procurement specifications must explicitly state **"ASTM A1011, Grade 60K, Class 1 Formable"**. Prototyping and process qualification are strongly recommended before full-scale production. -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) Specification Dimensions Size： Diameter 20-1000 mm Length <4597 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. -: AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) -:- For detailed product information, please contact sales. -:

Packing of AK Steel ASTM A 1011, Class 1 Formable, Grade 60K Hot Rolled Carbon Steel, Medium/High Strength Low Alloy Steel (HSLA) -:- 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 1068 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