AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel

AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) Product Information -:- For detailed product information, please contact sales. -: AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) Synonyms -:- For detailed product information, please contact sales. -:

AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AK Steel ASTM A570 Grade 36 (SQ) Hot Rolled Carbon Steel** **AK Steel ASTM A570 Grade 36 (Structural Quality - SQ)** is a **standard-strength, hot-rolled carbon steel sheet and strip** designed as a versatile workhorse material for **general structural and fabrication applications**. This grade provides a **minimum yield strength of 36 ksi (250 MPa)**, making it one of the most commonly specified grades within the A570 series for applications requiring a reliable balance of strength, formability, and weldability. The "SQ" designation confirms its production to **Structural Quality** standards, ensuring it is suitable for a wide range of commercial and light industrial uses where cost-effectiveness and ease of manufacturing are critical. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A570/A570M** - Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality. * **Quality Designation:** **Structural Quality (SQ)** - Indicates standard commercial quality suitable for structural purposes without special hardening requirements. * **Governance:** Manufactured to standard mill practices for hot-rolled products. Dimensional tolerances typically conform to **ASTM A568**. * **Related Standards:** * **ASTM A36/A36M** - Carbon Structural Steel (a common equivalent for plates, bars, and shapes). * **SAE J1392** - Hot Rolled HSLA and Carbon Steel Sheet and Strip. * **ASTM A1011** - Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy and High-Strength Low-Alloy with Improved Formability. * **Key Distinction:** A **basic carbon-manganese steel** without intentional microalloying, serving as a fundamental structural material distinct from higher-strength, alloyed grades. --- ## **Chemical Composition (Weight %, max)** The composition represents a typical carbon steel formulation, with carbon and manganese as the primary strengthening agents. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.25 max | Provides fundamental strength; controlled to maintain weldability and formability. | | **Manganese (Mn)** | 0.90 max | Enhances strength and hardenability; works synergistically with carbon. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low to ensure good ductility and weldability. | | **Sulfur (S)** | 0.05 max | Impurity, controlled to prevent hot shortness during welding. | | **Silicon (Si)** | - (Residual) | Deoxidizer; present in small amounts from steelmaking. | | **Carbon Equivalent (CE)** | ~0.36 - 0.43 | Moderate, indicating good weldability with standard practices. | **Note:** Actual mill chemistry is controlled within these maximum limits to achieve the specified mechanical properties during hot rolling. It is a widely produced commodity steel. --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Grade 36)** | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 400 - 550 MPa (58,000 - 80,000 psi) | | **Yield Strength (min)** | **250 MPa (36,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | **23%** (Indicates good ductility and formability for its strength level). | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Formability** | **Good.** Suitable for moderate bending, roll forming, and stamping. Minimum bend radius is typically **0.5 - 1 x material thickness** for a 90° bend. | | **Weldability** | **Excellent.** Can be readily welded using all common processes (SMAW, GMAW, GTAW, Resistance Welding). Preheating is generally not required for typical thicknesses. | --- ## **Product Applications** AK Steel A570 Grade 36 (SQ) is one of the most widely used hot-rolled steels for light to medium-duty structural and fabricated components across numerous industries. **Primary Industries and Products:** 1. **Light Structural Framing & Construction:** * **Purlins, girts, and structural members** in metal buildings and warehouses. * **Studs, tracks, and framing** for interior and exterior walls. * **Stair stringers, platforms, and walkways.** 2. **Fabricated Enclosures & Cabinetry:** * **Electrical panels, switchgear enclosures, and control cabinets.** * **HVAC equipment housings, ductwork, and fittings.** * **Machine guards, covers, and safety shields.** 3. **Transportation & Automotive:** * **Trailer frames, side rails, and crossmembers.** * **Truck body components, flooring, and supports.** * **Agricultural equipment frames and brackets.** 4. **Material Handling & Storage:** * **Industrial shelving, storage racks, and lockers.** * **Pallets, skids, and material handling containers.** * **Conveyor frames and components.** 5. **General Manufacturing & Stampings:** * **Base plates, mounting brackets, and hardware.** * **Stamped parts** for appliances, furniture, and fixtures. --- ## **Advantages and Fabrication Considerations** * **Advantages:** * **Optimal Balance:** Offers the best practical balance of strength (36 ksi), formability, and weldability in the A570 carbon steel series. * **Cost-Effective:** Highly economical and readily available, making it a default choice for countless applications. * **Predictable Performance:** Well-understood material behavior with established fabrication guidelines. * **Versatile Fabricability:** Easily sheared, punched, formed, and welded with standard shop equipment. * **Fabrication Considerations:** * **Surface Condition:** Hot-rolled material is supplied with a characteristic mill scale. For optimal paint or coating adhesion, this scale must be removed via **pickling, abrasive blasting, or grinding**. The **"Pickled and Oiled" (P&O)** condition is frequently specified for a clean, ready-to-paint surface. * **Flatness:** May exhibit slight camber or edge wave; leveling may be necessary for precision fabrication. * **Strain Aging:** Can be susceptible to strain aging after cold working, potentially increasing yield strength and reducing ductility over time. * **Design Limitations:** Not suitable for high-stress, primary load-bearing structural applications (e.g., building columns, major beams). For such uses, fully killed steel specified to standards like **ASTM A992** is required. * **Corrosion Protection:** Requires protective coatings (paint, galvanizing, powder coating) for long-term durability in exposed or corrosive environments. **In summary, AK Steel ASTM A570 Grade 36 (SQ) is the quintessential general-purpose hot-rolled carbon steel. Its 36 ksi minimum yield strength, combined with excellent fabricability and widespread availability, makes it the material of choice for a vast spectrum of light structural and fabricated metal products where reliability, cost, and ease of manufacture are the primary drivers.** -:- For detailed product information, please contact sales. -: AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) Specification Dimensions Size： Diameter 20-1000 mm Length <4556 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 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) Properties -:- For detailed product information, please contact sales. -:

Applications of AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) -:- For detailed product information, please contact sales. -: Chemical Identifiers AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) -:- For detailed product information, please contact sales. -:

Packing of AK Steel ASTM A 570, Grade 36 Hot Rolled Carbon Steel, Structural Quality (SQ) -:- 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 1027 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