EN S275J2G4 High Manganese, Quality Steel Rod/Bar

EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod, t>200 mm Product Information -:- For detailed product information, please contact sales. -: EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod, t>200 mm Synonyms -:- For detailed product information, please contact sales. -:

EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Product Information -:- For detailed product information, please contact sales. -: # **Product Name:** EN S275J2G4 (S275J2+M) Structural Steel, Thermomechanically Rolled, Quality Grade, Ultra-Heavy Plate (t > 200 mm) **Overview:** EN S275J2G4 is a **thermomechanically controlled processed (TMCP), fine-grained structural steel** specified under EN 10025-4. The "J2G4" designation indicates a material with **guaranteed impact toughness at -20°C (J2)**, supplied in the **thermomechanically rolled condition (G4 or +M)**. For **ultra-heavy plates exceeding 200 mm in thickness**, this advanced processing route is exceptionally challenging but offers significant metallurgical advantages, including a very fine, homogeneous microstructure and enhanced toughness without a separate normalization heat treatment. It is engineered for the most critical applications where weight optimization, weldability, and performance in low-temperature environments are paramount. It is **not a "High Manganese" steel**; its properties stem from advanced rolling technology and microalloying. **Key International Standards:** * **Primary Standard:** **EN 10025-4:2019** - Hot rolled products of structural steels - Part 4: Technical delivery conditions for thermomechanical rolled weldable fine grain structural steels. * **Grade & Condition Designation:** **S275J2G4** or **S275J2+M** * **S:** Structural Steel. * **275:** Nominal yield strength class. For t > 200mm, the guaranteed minimum is **subject to specific agreement** and will be lower than standard values. * **J2:** Quality designation, guaranteeing impact energy testing at **-20°C**. * **G4/M:** Indicates **thermomechanical rolling (M)**. This is a sophisticated, computer-controlled rolling process within specific temperature ranges to achieve the final properties. * **Critical Thickness Consideration:** Producing thermomechanically rolled plates **thicker than 200 mm** is at the extreme limit of modern mill capability. It requires specialized equipment and process controls. The mechanical properties are **non-standard and must be rigorously defined by contract**. * **Special Requirements:** For this thickness, compliance with **through-thickness properties (EN 10164, typically Z35)** and **high-level ultrasonic testing (e.g., EN 10160 S3E3 or stricter)** is mandatory. **Chemical Composition (Ladle Analysis, % by weight, typical for TMCP heavy plate):** Composition is lean and optimized for the TMCP process, with precise microalloying. * **Carbon (C):** **Low, typically ≤ 0.12%** (Essential for excellent weldability and toughness in thick sections). * **Manganese (Mn):** **1.20% - 1.60%** (Provides solid solution strengthening; balanced with CEV). * **Phosphorus (P):** ≤ **0.020%** (Very low). * **Sulphur (S):** ≤ **0.005%** (Extremely low, often "calcium-treated" for shape control and superior Z-properties). * **Silicon (Si):** ≤ **0.40%**. * **Aluminum (Alt):** ≥ **0.020%** (For grain refinement). * **Microalloys (Nb, Ti, V):** Precisely added (e.g., Nb 0.02-0.05%, Ti 0.01-0.02%) to control recrystallization and precipitation during TMCP. * **Carbon Equivalent (CEV/CET):** **Very low, typically ≤ 0.36**. This is a major advantage, drastically reducing pre-heat requirements and cracking susceptibility in welding. **Physical & Mechanical Properties (for thermomechanically rolled condition, t > 200 mm):** ***All values are subject to contractual agreement. The following represent state-of-the-art achievable targets.*** * **Yield Strength (ReH):** **Agreed Minimum.** Target range **≥ 260 - 280 MPa** (May achieve closer to nominal strength than normalized grades due to TMCP efficiency). * **Tensile Strength (Rm):** **Agreed Minimum.** Target **430 - 550 MPa**. * **Elongation at Break (A5):** **Agreed Minimum.** Target **≥ 22%**. * **Impact Energy (KV):** **≥ 27 J at -20°C** is the base standard, but for this application, **≥ 40-60 J at -40°C** is often specified to ensure a large safety margin. * **Fine Grain Size:** Extremely fine, typically **ASTM 10 or finer**. * **Through-Thickness Properties (Z-direction):** **Mandatory. Z35 minimum, with Z45 often targeted.** * **Ultrasonic Testing (UT):** **Mandatory at the highest class (e.g., EN 10160 S4E4)** to guarantee flawless internal quality. * **Yield-to-Tensile Ratio:** Typically low (<0.85), indicating good capacity for plastic deformation. **Product Features for Ultra-Heavy TMCP Plate:** 1. **Superior Weldability:** The extremely low carbon equivalent is the single most important feature, allowing for welding with **lower or no pre-heat**, reduced risk of hydrogen cracking, and simpler PWHT (Post Weld Heat Treatment) regimes, leading to enormous cost and time savings in fabrication. 2. **Exceptional Toughness:** The combination of very fine grain and clean chemistry provides outstanding low-temperature impact properties, often exceeding standard requirements. 3. **Homogeneous Properties:** The TMCP process, when successfully applied to such thicknesses, can achieve remarkable uniformity of properties through the thickness. 4. **Weight Saving Potential:** Allows designers to use thinner sections or higher design stresses due to the combination of good strength and excellent toughness, though this is secondary for such massive components. **Typical Applications (for t > 200 mm):** These are flagship projects in heavy industry. * **Offshore Wind & Oil & Gas:** **Monopile transitions pieces, jacket legs and nodes for next-generation offshore platforms**, where weldability is a critical cost and safety driver. * **Arctic Marine & Shipping:** **Ice-breaking hull sections, polar-class vessel components**. * **Advanced Civil Engineering:** **Critical welded nodes in long-span bridges, seismic dampers, and ultra-high-rise building core walls**. * **Hydrogen & Cryogenic Infrastructure:** **Thick-walled sections for hydrogen storage vessels and transport modules**. **Available Forms & Quality Supplements:** * **Form:** **Ultra-heavy thermomechanically rolled plates** from a limited number of world-class mills. * **Delivery Condition:** **Thermomechanically Rolled (TMCP, +M)**. No further heat treatment. * **Mandatory Testing:** Extensive testing including: tensile tests at surface, 1/4t, 1/2t; multi-temperature Charpy curves (e.g., -20°C, -40°C, -60°C); CTOD testing may be required; full chemical analysis; **UT imaging and report**. * **Certification:** **EN 10204 Type 3.2 Inspection Certificate**, often with additional mill-specific documentation. --- **Critical Procurement & Design Note:** 1. **Extremely Specialized Product:** This is not a standard item. Procurement requires **early engagement with a capable mill** and potentially a **qualification program**. 2. **Agreed Properties are Non-Standard:** Contractual specification must detail **all mechanical properties, toughness requirements at specific temperatures, Z-quality, and UT class**. 3. **Not "High Manganese":** This term is irrelevant. The key terms are **"Thermomechanically Rolled (TMCP)"** and **"Ultra-Low Carbon Equivalent."** 4. **Example Order Clause:** *"EN 10025-4 S275J2G4 (S275J2+M), t=210mm. Min ReH ≥ 270 MPa, Min Rm ≥ 480 MPa, A5 ≥ 24%. KV ≥ 60J at -40°C (1/4t). CEV ≤ 0.36. P≤0.015%, S≤0.003%. UT per EN 10160 S4E4. Z45 per EN 10164. CTOD testing to be agreed."* **This material represents the pinnacle of modern plate steel technology for heavy welded construction. Its specification and purchase require expert knowledge and collaboration between designer, fabricator, and steel producer.** -:- For detailed product information, please contact sales. -: EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Specification Dimensions Size： Diameter 20-1000 mm Length <5826 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. -: EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Properties -:- For detailed product information, please contact sales. -:

Applications of EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod, t>200 mm -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod, t>200 mm -:- For detailed product information, please contact sales. -:

Packing of EN S275J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Rod, t>200 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 2297 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