AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS)

AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) Product Information -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) Product Information -:- For detailed product information, please contact sales. -: **Product Name:** AK Steel ASTM A1011, Grade 36 Type 1 Hot-Rolled Carbon Steel, Structural Steel (SS) --- ### **1. Overview** AK Steel's ASTM A1011 Grade 36 Type 1 is a standardized, high-quality hot-rolled carbon steel designed for structural applications requiring reliable strength and excellent formability. This grade represents one of the most commonly specified materials in North America for general structural components. The "Grade 36" indicates a minimum yield strength of 36 ksi (250 MPa), while "Type 1" specifies that the steel is produced to a fully-killed, fine-grained practice using aluminum (Al) grain refinement. This manufacturing control ensures superior internal soundness, improved notch toughness, and more consistent mechanical properties compared to non-killed or semi-killed steels. --- ### **2. International Standards** This product is manufactured to meet the exacting requirements of the following primary standard, with specific reference to its type and grade: * **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:** 36 * **Type:** 1 (Aluminum-Killed, Fine-Grained Steel) --- ### **3. Chemical Composition (Typical, % by Weight)** The chemistry for Grade 36 Type 1 is carefully controlled to meet both strength requirements and the specific deoxidation practice. Note the mandatory aluminum content for grain refinement. | Element | Content (Maximum, unless specified) | Role & Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.25% max | Provides strength; controlled for weldability and formability. | | **Manganese (Mn)** | 0.90% max | Primary strengthening element; enhances hardenability. | | **Phosphorus (P)** | 0.035% max | Residual; kept low for ductility and toughness. | | **Sulfur (S)** | 0.035% max | Residual; controlled to minimize hot shortness. | | **Silicon (Si)** | 0.10% - 0.30% | Deoxidizer; contributes to strength. | | **Aluminum (Al), Total** | **0.010% min (typically 0.015-0.060%)** | **Critical for Type 1.** Acts as the primary grain refiner to produce a fine austenitic grain size, improving toughness and ductility. | | **Copper (Cu)** | 0.20% min (when specified) | Optional for enhanced atmospheric corrosion resistance. | **Key Distinction (Type 1):** The mandatory minimum Aluminum content is the defining chemical difference that sets Type 1 apart from other types (e.g., Type 2, which may use other grain refiners like Niobium). This results in a finer, more uniform microstructure. --- ### **4. Physical & Mechanical Properties** Properties are for the as-hot-rolled condition. The fine-grained structure of Type 1 steel provides more consistent properties, especially in transverse forming. | Property | Specification Minimum (ASTM A1011) | Typical Value / Description | | :--- | :--- | :--- | | **Yield Strength (min)** | 36 ksi (250 MPa) | | | **Tensile Strength** | 53 ksi min (365 MPa) | Typically ranges from 53 - 72 ksi (365 - 500 MPa). | | **Elongation in 2" (min)** | 20% (for thickness ≥ 0.23 in.) | Good ductility, enhanced by the fine-grained structure for better forming. | | **Modulus of Elasticity** | 29,000 ksi (200 GPa) | | | **Density** | 0.284 lb/in³ (7.85 g/cm³) | | | **Notch Toughness** | Improved over non-killed grades | The fine-grained Al-killed structure provides better resistance to brittle fracture. | | **Surface Finish** | Standard hot-rolled mill finish with uniform scale. | Requires descaling (pickling, blasting) for painting or critical welding. | --- ### **5. Key Features & Advantages** * **Superior Internal Quality:** The fully-killed, aluminum-treated manufacturing process minimizes internal voids (porosity) and ensures a homogeneous, fine-grained microstructure. * **Enhanced Formability & Consistency:** Excellent and predictable forming characteristics in all directions (reduced anisotropy), making it ideal for complex stamping or bending. * **Improved Weldability & Toughness:** The fine grain structure and controlled chemistry lower the risk of heat-affected zone (HAZ) cracking and improve low-temperature performance. * **Reliable Structural Performance:** Provides a dependable 36 ksi minimum yield strength with consistent batch-to-batch properties, crucial for calculated structural designs. * **Excellent Paintability & Surface:** After descaling, the uniform surface provides an excellent substrate for painting and coating adherence. --- ### **6. Product Applications** ASTM A1011 Grade 36 Type 1 is the preferred choice for demanding structural fabrications where material consistency and formability are critical. * **Building & Construction:** Structural frames, purlins, girts, trusses, weldable base plates, and building columns. * **Bridge Components:** Non-primary tension members, approach plates, and ancillary structures. * **Heavy Equipment & Machinery:** Crane booms, truck frames, agricultural equipment chassis, and excavator components. * **Material Handling & Storage:** Heavy-duty pallet racking systems, industrial shelving frames, and conveyor supports. * **Transportation:** Railcar underframes, trailer structural members, and shipping container corner posts. * **General Fabrication:** Any component requiring reliable strength, good weldability, and consistent formability in complex shapes. --- ### **7. Fabrication & Processing Notes** * **Descaling:** Essential for most applications. Pickling or abrasive blasting is required to remove mill scale prior to welding, painting, or galvanizing. * **Forming:** Excellent for cold bending, punching, and roll-forming. The fine-grained structure allows for tighter bend radii and more severe deformation without cracking. * **Welding:** Highly weldable using all common processes. No preheat is typically required for thin to moderate sections. Use low-hydrogen practices for thick sections or restrained joints. * **Galvanizing:** An excellent substrate for hot-dip galvanizing due to its consistent silicon content (within the recommended range for galvanizing). --- **Disclaimer:** *This profile is a technical summary. AK Steel is now part of Cleveland-Cliffs Inc.* For all engineering, design, and procurement activities, it is imperative to consult the latest **ASTM A1011** standard and the certified **Mill Test Report (MTR)** or **Technical Data Sheet** from the producer. These documents contain the legally binding specifications for chemistry, mechanical properties, and tolerances for your specific lot of material. -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) Specification Dimensions Size： Diameter 20-1000 mm Length <4583 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, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) -:- For detailed product information, please contact sales. -:

Packing of AK Steel ASTM A 1011, Grade 36 Type 1 Hot Rolled Carbon Steel, Structural Steel (SS) -:- 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 1054 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