EN S355K2G4C High Manganese, Quality Steel Rod/Bar

EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Rod Product Information -:- For detailed product information, please contact sales. -: EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Rod Synonyms -:- For detailed product information, please contact sales. -:

EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Name:** EN S355K2G4C Structural Steel for Cold Forming, Thermomechanically Rolled, High-Toughness Grade **Overview** EN S355K2G4C is a **premium, multi-attribute structural steel** that represents the pinnacle of modern material engineering for the most demanding applications. It is a **thermomechanically rolled (TMCP), fine-grained steel** with **enhanced guaranteed impact toughness at -20°C (K2 quality)** and a **chemical composition explicitly optimized for superior cold formability (C designation)**. This grade synthesizes the highest standard of toughness, advanced processing efficiency, exceptional weldability, and certified cold workability into a single material. It is designed for fabricating complex, high-strength safety-critical components that must perform flawlessly in severe low-temperature environments. It is definitively **not a "High Manganese" steel**; its unparalleled properties are achieved through ultra-lean alloy design, precise microalloying, and sophisticated thermomechanical control. **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. * The "C" (cold forming) requirement is applied as a supplementary chemical specification. * **Grade & Designation Decoding:** **S355K2G4C** * **S:** Structural Steel. * **355:** Minimum yield strength in MPa (for nominal thickness ≤ 16mm). * **K2:** **Superior quality designation.** Guarantees a higher minimum impact energy at **-20°C** than J2 grades. * **G4/M:** Delivery condition: **Thermomechanically rolled (TMCP)**. * **C:** Supplementary designation for **steels intended for cold forming**. * **Core Concept:** This is an **elite, fabrication-enabling steel** that combines four premium attributes: 1) High Strength (S355), 2) **Enhanced Fracture Toughness (-20°C, K2)**, 3) Modern, Weldable TMCP Structure (G4), and 4) Certified Severe Cold Formability (C). It is designed for the ultimate manufacturing challenge: **Cut → Severe Cold Forming → Welding → Service in critical -20°C environments**. * **Clarification on "High Manganese":** This term is **obsolete and misrepresents its advanced nature**. Manganese is part of a lean, balanced alloy design focused on achieving an ultra-low Carbon Equivalent (CEV). The value is in its **processing technology, toughness, and formability**. **Chemical Composition (Ladle Analysis, % by weight, typical for premium TMCP with 'C' and 'K2' requirements)** Ultra-clean, lean, and precision-engineered for maximum toughness and ductility. * **Carbon (C):** **Ultra-Low, typically ≤ 0.06 - 0.08%** (Core to achieving ultra-low CEV and supreme formability and toughness). * **Manganese (Mn):** **1.50% - 1.65%** (Carefully balanced to provide necessary strength with minimal impact on CEV, often at the upper end of the range for hardenability). * **Phosphorus (P):** ≤ **0.012%** (Extremely low to eliminate cold shortness and maximize toughness). * **Sulphur (S):** ≤ **0.003%** (Ultra-low, calcium-treated; critical for flawless edge formability, surface quality, and Z-direction properties). * **Silicon (Si):** ≤ **0.35%**. * **Aluminum (Alt):** ≥ **0.025%** (For potent grain refinement). * **Microalloys (Nb, Ti, Mo):** Precisely added (e.g., Nb 0.03-0.05%, Ti 0.01-0.02%, Mo ≤ 0.10%) for advanced austenite conditioning and microstructural control during TMCP. * **Carbon Equivalent (CEV):** **Exceptionally low, typically ≤ 0.30 - 0.33**. This grants **outstanding weldability with minimal to no pre-heat**. **Physical & Mechanical Properties (for thermomechanical condition, thickness ≤ 16mm)** * **Yield Strength (ReH):** ≥ **355 MPa** (Minimum, thickness-dependent). * **Tensile Strength (Rm):** **470 - 630 MPa**. * **Elongation at Break (A5):** ≥ **21%** (Minimum, typically >28%). * **Impact Energy (KV):** **≥ 40 J at -20°C** (Longitudinal, Charpy V-notch). **The defining K2 property.** Actual values are typically **> 80 J at -40°C**, providing an immense safety margin. * **Fine Grain Size:** Extremely fine, typically **ASTM 11 or finer**. * **Cold Formability:** **Outstanding.** The synergy of an ultra-low carbon, fine-grained acicular ferrite/bainite TMCP microstructure and near-zero P/S content provides exceptional ductility and strain distribution. Allows for **deep drawing, tight-radius bending (approaching 0.5t), and complex stamping** with excellent surface quality and negligible risk of edge cracking, even at this high toughness level. * **Density:** **~7.85 g/cm³**. **Product Features** 1. **Unparalleled Fabrication Flexibility & Safety:** Unites best-in-class **cold formability**, best-in-class **weldability** (ultra-low CEV), and **highest standard-grade toughness (K2)**. This de-risks complex manufacturing and guarantees end-performance in the most extreme conditions. 2. **TMCP Efficiency & Property Consistency:** Achieves unparalleled strength-toughness-formability balance directly from rolling, with exceptional batch-to-batch consistency. 3. **Enables Revolutionary Designs:** Allows engineers to specify S355 strength in **ultra-complex, cold-formed shapes** for safety-critical applications in harsh environments, enabling weight savings and design innovations previously impossible. 4. **Reduces Total Project Cost & Risk:** The high initial cost is offset by **near-zero forming scrap, simplified and faster welding (no/low pre-heat), eliminated post-forming heat treatments, and guaranteed in-service reliability**. **Typical Applications** This grade is specified for flagship projects and equipment where performance, safety, and fabricability are non-negotiable. * **Arctic & Deep-Sea Offshore Engineering:** **Complex cold-formed nodes, buoyancy modules, and pressure hull stiffeners** for subsea and polar offshore structures. * **Next-Generation Defense & Aerospace Ground Support:** **Armored vehicle hull components, protective shelters, and launch platform structures** requiring blast resistance, complex shaping, and operation in extreme climates. * **Critical Energy Infrastructure:** **Formed sections for hydrogen cryogenic storage, fusion reactor support structures, and arctic pipeline compressor stations**. * **Ultra-High-Safety Transportation:** **Cold-formed crash management systems and roll cages** for specialty vehicles operating in polar regions. * **Heavy Machinery for Extreme Conditions:** **Critical components for deep-sea mining equipment and polar excavation machinery**. **Available Forms & Processing** * **Forms:** Supplied as **thermomechanically rolled sheet, strip (for advanced roll-forming), and plates** from a select few global mills. * **Surface:** Typically supplied with **advanced surface preparation (e.g., shot blasted & coated)** for optimal forming, welding, and corrosion protection. * **Processing:** **Optimized for high-precision, severe cold forming.** Welding is exceptionally straightforward; low heat input processes are ideal to preserve the ultra-fine HAZ. --- **Critical Procurement Note** * **Specialist, Cutting-Edge Product:** This is **not a commercial stock item**. Procurement requires **early partnership with leading metallurgical producers** and often a **technical qualification program**. * **Full Contractual Specification is Mandatory:** The purchase order must explicitly state **"EN 10025-4 S355K2G4C"** and detail **all property minima, especially the K2 impact value (≥40J at -20°C), maximum CEV (e.g., ≤0.33), and required supplementary tests (CTOD, Z-quality)**. * **Justification is Lifecycle Performance:** The cost is justified by **enabling mission-critical capabilities, eliminating fabrication and in-service failure risks, and achieving the highest safety standards in the most challenging environments**. * **Not "High Manganese":** This label is fundamentally wrong. The correct descriptors are **"Ultra-Low Carbon TMCP Steel with Enhanced Cold Formability and Superior -20°C Toughness (K2 Quality)."** * **Certification:** Requires a comprehensive **Inspection Certificate 3.2**, including full traceability, chemical analysis (highlighting ultra-low C, P, S, CEV), full mechanical tests, **multi-temperature Charpy curves** (e.g., -20°C, -40°C, -60°C), grain size, and typically **fracture mechanics testing (CTOD)**. -:- For detailed product information, please contact sales. -: EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5841 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 S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Properties -:- For detailed product information, please contact sales. -:

Applications of EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Rod -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Rod -:- For detailed product information, please contact sales. -:

Packing of EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Rod -:- 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 2312 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