ASTM A621 Hot Rolled Carbon Steel

ASTM A621 Hot Rolled Carbon Steel Product Information -:- For detailed product information, please contact sales. -: ASTM A621 Hot Rolled Carbon Steel Synonyms -:- For detailed product information, please contact sales. -:

ASTM A621 Hot Rolled Carbon Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A621 Hot-Rolled Carbon Steel** **ASTM A621** is a standard specification for **hot-rolled carbon steel** sheets and strips, intended primarily for **welded, riveted, or bolted chain**. This specification covers steel that is hot-rolled to specific chemical and mechanical property requirements, making it suitable for applications where high strength and good toughness are derived from the hot-rolling process. The steel is produced in two main types: * **Type 1:** Commercial Quality * **Type 2:** Drawing Quality It is supplied in the as-hot-rolled condition, which gives it a characteristic mill scale surface. --- #### **1. Key International Standards** * **Primary Standard:** **ASTM A621 / A621M** - Standard Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, for Chain. * **Related/Alternative Standards:** * **ASTM A569/A570:** Standard Specification for Carbon Steel (0.15 Max, 0.25 Max) Hot-Rolled Sheet and Strip (a more common general-purpose standard). * **ASTM A1011/A1011M:** Standard Specification for Steel, Sheet and Strip, Hot-Rolled, Carbon, Commercial Steel (CS), Drawing Steel (DS) - This is the most comprehensive modern standard for hot-rolled steel. * **SAE J403:** Chemical Compositions for Carbon Steels. * **EN 10025-2:** Hot rolled products of structural steels - Technical delivery conditions for non-alloy structural steels. * **JIS G 3131:** Hot-rolled mild steel plates, sheets and strip. --- #### **2. Chemical Composition (Heat Analysis)** The chemical composition is balanced to provide good strength and formability for its primary application in chain manufacturing. The following table represents typical ranges for grades commonly associated with this specification. | Element | Composition (%) - Typical Grades | Notes | | :--- | :--- | :--- | | **Carbon (C)** | 0.08 - 0.20 max | Provides base strength. Lower carbon improves weldability and formability. | | **Manganese (Mn)** | 0.60 - 1.20 max | Enhances strength and hardenability. Higher than in cold-rolled grades for chain. | | **Phosphorus (P)** | 0.04 max | Impurity, kept low to prevent cold brittleness. | | **Sulfur (S)** | 0.05 max | Impurity, kept low to improve hot workability and toughness. | | **Silicon (Si)** | (Varies by grade) | Deoxidizing agent; content is typically low. | | **Copper (Cu)** | (Varies by grade) | - | *Note: The exact chemical requirements depend on the specific grade and type ordered. The composition is tailored to withstand the hot-rolling process and meet the mechanical properties required for chain.* --- #### **3. Mechanical & Physical Properties** Properties are achieved through the hot-rolling process and chemical composition. The following are **typical ranges** for ASTM A621 steel. **Mechanical Properties (Typical):** | Property | Typical Value | Unit | | :--- | :--- | :--- | | **Yield Strength (min)** | 30 - 50 | ksi (205 - 345 MPa) | | **Tensile Strength** | 55 - 70 | ksi (380 - 485 MPa) | | **Elongation (in 2 in / 50 mm) (min)** | 15 - 25 | % | | **Modulus of Elasticity** | ~29,000 | ksi (~200 GPa) | *Note: Tensile and yield strength typically increase with carbon content. Elongation is generally lower than in cold-rolled steels due to the lack of a final annealing process.* **Physical Properties (Typical):** * **Density:** 0.284 lb/in³ (7850 kg/m³) * **Modulus of Elasticity:** 29,000 ksi (200 GPa) * **Poisson's Ratio:** 0.29 * **Thermal Expansion Coefficient:** 6.5 x 10^-6 /°F (11.7 x 10^-6 /°C) * **Thermal Conductivity:** ~50 W/m·K --- #### **4. Product Applications** ASTM A621 hot-rolled steel is primarily used in applications where high strength and cost-effectiveness are more critical than a perfect surface finish. * **Welded and Weldless Chain:** The primary application, including logging chains, tow chains, and high-test chain. * **Structural Components:** For general construction and machinery where hot-rolled strength is sufficient. * **Automotive Frames and Chassis Components:** Where strength and durability are key. * **Pipes and Tubes:** As a starting material for manufacturing structural or mechanical tubing. * **Staples, Fasteners, and Hardware:** For less critical forming applications. --- #### **5. Key Advantages** * **Cost-Effective:** The hot-rolling process is generally less expensive than cold-rolling, making it an economical choice. * **High Strength:** Good strength and toughness derived directly from the hot-rolling process. * **Good Weldability:** The controlled carbon content allows for reliable welding. * **Availability:** Available in a wide range of thicknesses and sizes. **Disclaimer:** This information is for general reference purposes. The properties and chemical ranges can vary based on the specific grade and condition ordered. For critical applications, always consult the latest official **ASTM A621/A621M** standard and technical data sheets from the steel producer. -:- For detailed product information, please contact sales. -: ASTM A621 Hot Rolled Carbon Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4497 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. -: ASTM A621 Hot Rolled Carbon Steel Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A621 Hot Rolled Carbon Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A621 Hot Rolled Carbon Steel -:- For detailed product information, please contact sales. -:

Packing of ASTM A621 Hot Rolled Carbon Steel -:- 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 968 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