AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS)

AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) Product Information -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) Product Information -:- For detailed product information, please contact sales. -: **Product Name:** AK Steel ASTM A1011, Grade 33 Hot-Rolled Carbon Steel, Structural Steel (SS) --- ### **1. Overview** AK Steel's ASTM A1011 Grade 33 is a versatile and widely used hot-rolled low-carbon structural steel sheet and strip. Positioned as a standard-strength workhorse material, it offers an optimal balance of moderate yield strength, excellent formability, and superior weldability. This grade is a fundamental choice for a vast array of structural and general manufacturing applications where reliable performance, ease of fabrication, and cost-effectiveness are primary concerns. The "Grade 33" designation indicates a minimum yield strength of 33 ksi (230 MPa). --- ### **2. International Standards** This product is manufactured to conform to the following key North American standard: * **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. * This product is classified under the **Commercial Steel (CS)** category, typically Type A or B, and meets the specific requirements for **Grade 33**. --- ### **3. Chemical Composition (Typical, % by Weight)** Grade 33 is a non-alloy, carbon-manganese steel with a composition designed for manufacturability. Specifications are typically expressed as maximums unless noted. | Element | Content (Maximum, unless specified) | Role & Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.08% - 0.22% (Typical range) | Provides foundational strength. Controlled at lower levels to ensure excellent weldability and formability. | | **Manganese (Mn)** | 0.70% - 0.90% | Primary strengthening element; enhances hardenability and hot-rolling characteristics. | | **Phosphorus (P)** | 0.035% max | Residual impurity; kept low to preserve ductility and toughness. | | **Sulfur (S)** | 0.035% max | Residual impurity; controlled to minimize hot shortness and improve weld integrity. | | **Silicon (Si)** | 0.10% - 0.30% | Acts as a deoxidizer during steelmaking (killed or semi-killed practice). | | **Copper (Cu)** | 0.20% min (when specified) | Optional element; can be specified to provide enhanced atmospheric corrosion resistance per ASTM A1011. | **Note:** The exact composition can vary based on the deoxidation practice (CS Type A, B, etc.), which affects the steel's internal quality and suitability for specific forming operations. --- ### **4. Physical & Mechanical Properties** Properties are measured in the as-hot-rolled condition. The steel exhibits isotropic behavior with uniform properties in all directions. | Property | Specification Minimum (ASTM A1011) | Typical Value / Description | | :--- | :--- | :--- | | **Yield Strength (min)** | 33 ksi (230 MPa) | | | **Tensile Strength** | 49 ksi min (340 MPa) | Typically ranges from 49 - 65 ksi (340 - 450 MPa). | | **Elongation in 2" (min)** | 22% (for thickness ≥ 0.23 in.) | Demonstrates good ductility for bending, roll-forming, and moderate stamping. | | **Modulus of Elasticity** | 29,000 ksi (200 GPa) | Standard elastic modulus for carbon steel. | | **Density** | 0.284 lb/in³ (7.85 g/cm³) | | | **Poisson's Ratio** | ~0.29 | | | **Surface Finish** | Standard hot-rolled mill finish with adherent oxide scale (mill scale). | Scale must be removed via pickling, abrasive blasting, or grinding prior to painting, welding, or precise fabrication. | --- ### **5. Key Features & Advantages** * **Excellent Fabricability:** The low carbon equivalent provides outstanding weldability without preheat for most thicknesses and allows for easy cold bending, punching, and shearing. * **Cost-Effective Versatility:** Offers the best combination of strength, formability, and price for countless general-purpose applications. * **High Machinability:** Machines readily with good chip formation and surface finish. * **Broad Availability:** Available in the widest range of thicknesses, widths, and coil sizes among hot-rolled grades. * **Ideal Substrate:** Serves as a perfect base material for secondary processes like galvanizing (ASTM A653), pickling and oiling (P&O), or painting. --- ### **6. Product Applications** ASTM A1011 Grade 33 is one of the most commonly specified steels across multiple industries due to its reliable performance. * **Construction & Infrastructure:** Light structural members, joists, building frames, base plates, and concrete reinforcing bar (rebar) supports. * **Transportation Equipment:** Trailer frames, truck chassis components, railcar parts, and shipping containers. * **Agricultural & Heavy Equipment:** Machine frames, guards, brackets, housings, and implement components. * **Storage & Material Handling:** Warehouse shelving, pallet racking uprights (for specific load ratings), industrial shelving, and bin systems. * **Pipe & Conduit:** Used as the starting material for manufacturing welded structural pipe, mechanical tubing, and electrical conduit. * **General Manufacturing:** Brackets, frames, platforms, and any component requiring a balance of strength and easy fabrication. --- ### **7. Fabrication & Processing Notes** * **Descaling:** The hot-rolled mill scale is non-uniform and must be removed for quality welding, painting, or plating. Pickling or abrasive blasting are standard methods. * **Forming:** Excellent for cold bending. Minimum recommended inside bend radius is typically equal to the material thickness for a 90-degree bend perpendicular to the rolling direction. * **Welding:** Exceptionally weldable using all common arc welding processes (SMAW, GMAW/MIG, FCAW, SAW). Matching strength filler metals (e.g., 70 ksi tensile strength) are commonly used. * **Machining:** Exhibits good machinability. Use of sharp tools and appropriate coolants is recommended for optimal results. --- **Disclaimer:** *This description is for informational purposes. AK Steel is now part of Cleveland-Cliffs Inc.* For engineering and procurement, always refer to the current official **ASTM A1011** specification and the certified **Mill Test Report (MTR)** or **Technical Data Sheet (TDS)** from the manufacturer for the precise chemistry, mechanical properties, tolerances, and processing recommendations relevant to your specific order and application. -:- For detailed product information, please contact sales. -: AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) Specification Dimensions Size： Diameter 20-1000 mm Length <4582 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 33 Hot Rolled Carbon Steel, Structural Steel (SS) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel ASTM A 1011, Grade 33 Hot Rolled Carbon Steel, Structural Steel (SS) -:- For detailed product information, please contact sales. -:

Packing of AK Steel ASTM A 1011, Grade 33 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 1053 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