ASTM A514 Steel Rod/Bar, grade J

ASTM A514 Steel Rod, grade J, plate thickness 19 - 64 mm Product Information -:- For detailed product information, please contact sales. -: ASTM A514 Steel Rod, grade J, plate thickness 19 - 64 mm Synonyms -:- For detailed product information, please contact sales. -:

ASTM A514 Steel, grade J, plate thickness 19 - 64 mm Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: ASTM A514 Grade J Steel Plate (Thickness 19 - 64 mm)** **ASTM A514 Grade J** is a high-strength, quenched and tempered alloy steel plate designed for demanding applications where an exceptional strength-to-weight ratio, superior toughness, and good weldability are paramount. It belongs to the family of steels often referred to commercially as "T-1" type steels. Grade J is chemically formulated to maintain a minimum yield strength of 100 ksi (690 MPa) across its entire thickness range, including the critical mid-range of **19 to 64 mm**, which covers a vast majority of heavy structural components. This grade offers an optimal balance of through-thickness properties, making it a preferred choice for primary structures in mining, construction, and material handling equipment. --- #### **1. International Standards** The primary governing standard is **ASTM A514/A514M** - "Standard Specification for High-Yield-Strength, Quenched and Tempered Alloy Steel Plate, Suitable for Welding." It is crucial to note that while equivalent high-strength categories exist internationally (e.g., **EN 10025-6: S690Q**), **ASTM A514 Grade J** has a unique chemical composition that distinguishes it from other grades within the A514 standard itself, such as Grade H or F. Its specific chemistry, particularly its nickel content, is tailored for robust performance in thicker sections. --- #### **2. Chemical Composition** The chemical composition of Grade J is carefully balanced to achieve high hardenability, ensuring the development of high strength throughout the entire thickness during the quench and temper process, while maintaining good weldability. The following table outlines the specified range for key elements. | Element | Composition (Maximum %) | | :--- | :--- | | Carbon (C) | 0.12 - 0.21 | | Manganese (Mn) | 0.95 - 1.30 | | Phosphorus (P) | 0.035 | | Sulfur (S) | 0.040 | | Silicon (Si) | 0.40 - 0.80 | | Nickel (Ni) | 0.25 - 0.50 | | Chromium (Cr) | 0.40 - 0.65 | | Molybdenum (Mo) | 0.20 - 0.30 | | Vanadium (V) | 0.01 - 0.03 | | Boron (B) | 0.001 - 0.005 | **Key Points:** * The controlled carbon content is key to ensuring good weldability and minimizing the risk of cold cracking in thick sections. * The addition of **Nickel (Ni)** is a defining feature of Grade J, significantly enhancing low-temperature toughness and hardenability, which is critical for plates in this thickness range. * The synergy of Chromium, Molybdenum, and Boron ensures the steel transforms to a high-strength microstructure even at the center of a 64 mm thick plate. * Low levels of impurities (Phosphorus and Sulfur) ensure good ductility and resistance to embrittlement. --- #### **3. Physical & Mechanical Properties** For plates in the **19 to 64 mm thickness range**, the mechanical properties are as follows: | Property | Value | | :--- | :--- | | **Tensile Strength** | 760 - 895 MPa (110 - 130 ksi) | | **Yield Strength (min.)** | 690 MPa (100 ksi) | | **Elongation in 2 in. (min.)** | 18% | | **Modulus of Elasticity** | 200 GPa (29,000 ksi) | | **Hardness (Brinell)** | Typically 235 - 293 HBW | **Toughness:** ASTM A514 Grade J is renowned for its excellent impact resistance, a critical property for thick plates used in dynamic loading environments. Charpy V-Notch impact testing is typically conducted at very low temperatures, such as **-50°F (-46°C)**, with minimum average absorbed energy requirements often specified at 40 J (30 ft-lbf) or higher. **Other Physical Properties:** * **Density:** Approximately 7.85 g/cm³ (0.284 lb/in³) * **Poisson's Ratio:** 0.29 * **Machinability:** Rated as poor. Machining requires powerful equipment, rigid setups, and carbide tools with positive rake angles. --- #### **4. Product Applications** The combination of high strength and excellent toughness in thick plates makes ASTM A514 Grade J the material of choice for the most critical and heavily loaded components. * **Mining Equipment:** Bodies, frames, and booms for ultra-class haul trucks; buckets and dippers for large shovels and excavators; crusher components. * **Construction Machinery:** Main booms, sticks, and crawler undercarriages for large hydraulic excavators and cranes. * **Material Handling:** Primary structures for high-capacity port cranes, container handling equipment, and heavy-duty forklift masts. * **Energy Sector:** Support structures and components for large presses, and in the bases and platforms for wind turbine towers. * **Bridge Construction:** For critical welded components in movable bridges (lift, bascule) where reducing dead load is essential without sacrificing strength. --- #### **5. Fabrication Considerations** * **Welding:** While A514 Grade J is classified as weldable, welding thick sections (19-64 mm) demands strict procedural control. * **Low-hydrogen welding processes** (e.g., SMAW, GMAW, FCAW) are mandatory. * **Preheating** is critical. For this thickness range, preheat temperatures typically range from 150°C to 230°C (300°F to 450°F), depending on the exact thickness and joint restraint, to prevent hydrogen-induced (cold) cracking. * **Post-Weld Heat Treatment (PWHT/Stress Relieving)** is strongly recommended for most applications to relieve high residual stresses, restore toughness in the Heat-Affected Zone (HAZ), and ensure dimensional stability. * **Cutting:** Plasma arc and waterjet cutting are preferred methods. Oxy-fuel cutting is possible but requires careful procedure and often preheating to avoid cracking. * **Forming:** Cold forming is difficult and limited. Hot forming is the standard method for any significant bending of plates in this thickness and strength category. ### **Summary** **ASTM A514 Grade J steel plate in the 19-64 mm thickness range** is a premium quenched and tempered alloy steel engineered for the most demanding structural applications. Its unique nickel-bearing chemistry guarantees a minimum yield strength of 100 ksi along with exceptional toughness, even in thick sections and at low service temperatures. While it requires careful fabrication practices, particularly for welding, its unparalleled performance makes it an indispensable material for building the backbone of the world's heaviest and most critical machinery and structures. -:- For detailed product information, please contact sales. -: ASTM A514 Steel, grade J, plate thickness 19 - 64 mm Specification Dimensions Size： Diameter 20-1000 mm Length <4282 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 A514 Steel, grade J, plate thickness 19 - 64 mm Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A514 Steel Rod, grade J, plate thickness 19 - 64 mm -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A514 Steel Rod, grade J, plate thickness 19 - 64 mm -:- For detailed product information, please contact sales. -:

Packing of ASTM A514 Steel Rod, grade J, plate thickness 19 - 64 mm -:- 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 753 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