ASTM A517 Low Alloy Steel Rod/Bar, Grade J

ASTM A517 Low Alloy Steel Rod, Grade J Product Information -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel Rod, Grade J Synonyms -:- For detailed product information, please contact sales. -:

ASTM A517 Low Alloy Steel, Grade J Product Information -:- For detailed product information, please contact sales. -: ### **ASTM A517 Grade J: High-Strength Quenched and Tempered Alloy Steel** #### **1. Overview** ASTM A517 is a standard specification for high-strength, quenched and tempered alloy steel plates used in demanding applications such as pressure vessels, bridges, and other structural components. **Grade J** is a specific grade within this family, distinguished by its unique chemical composition that provides an excellent combination of ultra-high strength, good toughness, and **enhanced atmospheric corrosion resistance**. This combination makes it particularly suitable for applications where both high mechanical strength and longevity in exposed environments are required. #### **2. Chemical Composition** The chemical composition for ASTM A517 Grade J is carefully balanced to achieve high hardenability and its characteristic corrosion resistance. A key differentiator is the inclusion of Copper and Chromium, which contribute to its weathering properties. The following table outlines the required percentages (by heat analysis): | Element | Composition (%) | | :--- | :--- | | Carbon (C) | 0.15 - 0.21 | | Manganese (Mn) | 0.95 - 1.30 | | Phosphorus (P) | 0.035 max | | Sulfur (S) | 0.035 max | | Silicon (Si) | 0.15 - 0.35 | | Nickel (Ni) | 0.70 - 1.00 | | Chromium (Cr) | 0.40 - 0.65 | | Molybdenum (Mo) | 0.18 - 0.28 | | Boron (B) | 0.0015 - 0.0050 | | Vanadium (V) | 0.03 - 0.08 | | **Copper (Cu)** | **0.20 - 0.35** | **Key Alloying Roles:** * **Carbon & Manganese:** Provide base strength and hardenability. * **Nickel, Chromium, Molybdenum:** These elements work synergistically to increase hardenability, strength, and toughness. Chromium also enhances corrosion resistance. * **Copper:** A key element that, along with Chromium, Phosphorus, and Nickel, promotes the formation of a dense, adherent rust patina that retards further atmospheric corrosion. This is the defining feature of Grade J. * **Boron:** A powerful hardenability intensifier. * **Vanadium:** Contributes to grain refinement and secondary hardening. #### **3. Physical & Mechanical Properties** ASTM A517 Grade J is supplied in the quenched and tempered condition. The following mechanical properties are typically required for plates up to 2.5 inches (63.5 mm) in thickness: | Property | Requirement | | :--- | :--- | | **Tensile Strength** | 115 - 135 ksi (790 - 930 MPa) | | **Yield Strength (min)** | 100 ksi (690 MPa) | | **Elongation in 2-in (50 mm) (min)** | 16% | | **Reduction of Area (min)** | 50% | | **Hardness (Brinell)** | Typically 235 - 293 HBW | **Impact Toughness:** * **Charpy V-Notch (CVN) Impact Test:** Required at **-50°F (-46°C)**. * **Minimum Average Value:** 15 ft-lb (20 J) for longitudinal specimens. **Physical Properties (Typical Values):** * **Density:** 0.284 lb/in³ (7850 kg/m³) * **Modulus of Elasticity:** 29,000 ksi (200 GPa) * **Poisson's Ratio:** 0.29 * **Coefficient of Thermal Expansion:** ~6.5 x 10^-6/°F (11.7 x 10^-6/°C) #### **4. Product Applications** The combination of high strength and improved atmospheric corrosion resistance makes ASTM A517 Grade J ideal for applications where structural components are exposed to the elements, and where the weight savings of high-strength steel are critical. * **Pressure Vessels for Corrosive Environments:** Storage tanks and vessels in coastal or industrial atmospheres. * **Construction & Mining Equipment:** Structural booms, frames, and platforms for cranes and excavators that operate outdoors, reducing the need for frequent painting and maintenance. * **Unpainted Structural Applications:** In bridges, transmission towers, and building frames where a weathering steel appearance is acceptable or desired. * **Transportation:** Frame members and trailers for heavy-duty vehicles exposed to road salts and weather. * **Wind Turbine Towers:** Where high strength reduces material usage for the tall tower sections, and corrosion resistance is beneficial. #### **5. International Standards & Equivalents** ASTM A517 Grade J is a unique grade due to its corrosion-resistant properties. While other standards have high-strength and weathering steel grades, a direct, single-equivalent grade is less common. | Standard | Equivalent / Similar Grade | Key Differences / Notes | | :--- | :--- | :--- | | **ASTM A517** | **Grade J** | The base specification. | | **ASTM A871** | **Grade 65** | This is a specification for high-strength, corrosion-resistant steel plates. The chemistry and intent are very similar, making it a close functional relative. | | **EN 10025-5** | **S690Q** | A European high-strength steel. **This is not a weathering steel.** For corrosion resistance, one would need to look at grades like S355J2W per EN 10025-5, but these have much lower strength. | | **ASTM A588** | **Grade A/K** | A well-known weathering steel specification, but with a typical yield strength of 50 ksi (345 MPa), which is significantly lower than A517 Grade J. | **Important Note on Fabrication:** Fabricating ASTM A517 Grade J requires the same stringent controls as other A517 grades, with additional consideration for its copper content. * **Welding:** Requires strict procedures including **pre-heating**, use of **low-hydrogen electrodes**, and often **Post-Weld Heat Treatment (PWHT)** to avoid hydrogen-induced cracking. * **Copper Caution:** While copper adds corrosion resistance, it can promote surface hot shortness during thermal cutting or welding if not properly controlled. Proper practices must be followed to avoid this issue. --- **Disclaimer:** This information is for reference purposes only. For critical design and fabrication, the latest version of the official **ASTM A517** standard and consultation with qualified materials engineers are essential. -:- For detailed product information, please contact sales. -: ASTM A517 Low Alloy Steel, Grade J Specification Dimensions Size： Diameter 20-1000 mm Length <4413 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 A517 Low Alloy Steel, Grade J Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A517 Low Alloy Steel Rod, Grade J -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A517 Low Alloy Steel Rod, Grade J -:- For detailed product information, please contact sales. -:

Packing of ASTM A517 Low Alloy Steel Rod, Grade J -:- 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 Rod 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 884 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