EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel

EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Product Information -:- For detailed product information, please contact sales. -: EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Synonyms -:- For detailed product information, please contact sales. -:

EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Name:** EN S355K2G3C Structural Steel for Cold Forming, Normalized, High-Toughness Grade **Overview** EN S355K2G3C is a **premium, multi-attribute structural steel** that integrates the most stringent performance criteria for critical fabrication. It is a **normalized, fine-grained steel (G3)** with **enhanced guaranteed impact toughness at -20°C (K2 quality)** and a **chemical composition explicitly optimized for superior cold formability (C designation)**. This grade represents the highest standard for applications requiring an uncompromising combination of high strength, exceptional fracture resistance in cold climates, excellent weldability, and the ability to withstand severe cold-forming operations. The normalization treatment provides a homogeneous, stress-relieved microstructure that is an ideal base for complex deformation. It is definitively **not a "High Manganese" steel**; its superior properties are derived from processing, grain refinement, and chemical cleanliness. **Key International Standards** * **Primary Standard:** **EN 10025-3:2019** - Hot rolled products of structural steels - Part 3: Technical delivery conditions for normalized/normalized rolled weldable fine grain structural steels. * The "C" (cold forming) requirement is applied as a supplementary chemical specification. * **Grade & Designation Decoding:** **S355K2G3C** * **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 the standard J2 grade. * **G3/N:** Delivery condition: **Normalized**. * **C:** Supplementary designation for **steels intended for cold forming**. * **Core Concept:** This is an **elite, fabrication-centric steel** integrating four premium attributes: 1) High Strength (S355), 2) **Enhanced Low-Temperature Toughness (-20°C, K2)**, 3) Normalized Homogeneity (G3), and 4) Certified Cold Formability (C). It is designed for the demanding sequence: **Cut → Severe Cold Forming → Welding → Service in critical -20°C environments**. * **Clarification on "High Manganese":** This term is **technically inaccurate and trivializes its advanced nature**. Manganese content is controlled as part of a balanced alloy design. The material's value is in its **superior toughness, normalized structure, and certified cold formability**. **Chemical Composition (Ladle Analysis, % by weight, typical for high-toughness normalized steel with 'C' requirement)** Ultra-clean chemistry for maximum toughness and ductility. * **Carbon (C):** ≤ **0.16%** (Low to maximize toughness and weldability). * **Manganese (Mn):** ≤ **1.60%** (Standard range for S355). * **Phosphorus (P):** ≤ **0.020%** (**Key Differentiator** - Extra low to prevent cold cracking and maximize toughness). * **Sulphur (S):** ≤ **0.015%** (**Key Differentiator** - Extremely low for superior edge ductility, through-thickness properties, and weldability). * **Silicon (Si):** ≤ **0.50%**. * **Aluminum (Alt):** ≥ **0.020%** (Mandatory for grain refinement). * **Nitrogen (N):** ≤ **0.012%**. * **Microalloys (Nb, Ti):** Precisely added for grain size control (e.g., Nb ≤ 0.04%). * **Carbon Equivalent (CEV):** Typically moderate (~0.36-0.40). The normalized condition and clean chemistry mitigate welding challenges. **Physical & Mechanical Properties (for normalized 'G3' condition, thickness ≤ 16mm)** * **Yield Strength (ReH):** ≥ **355 MPa** (Minimum for t ≤ 16mm; thickness-dependent). * **Tensile Strength (Rm):** **470 - 630 MPa**. * **Elongation at Break (A5):** ≥ **21%** (Minimum, typically higher due to favorable structure). * **Impact Energy (KV):** **≥ 40 J at -20°C** (Longitudinal, Charpy V-notch). **This is the defining K2 property, providing a significant safety margin over the 27J of J2 grades.** * **Fine Grain Size:** Minimum grain size **7 or finer** (EN ISO 643). * **Cold Formability:** **Excellent.** The combination of a normalized, ductile microstructure and ultra-low P/S content allows for severe cold deformation (deep drawing, tight-radius bending) with minimal risk of cracking, even at this high strength and toughness level. * **Density:** **~7.85 g/cm³**. **Product Features** 1. **Uncompromised Toughness & Formability:** Unites **high-strength, enhanced fracture toughness (K2), and excellent cold formability** in one material, eliminating the typical engineering trade-offs for critical cold-climate components. 2. **Stable & Predictable Forming Base:** The normalized condition provides a homogeneous, stress-relieved starting condition, ensuring consistent springback behavior and dimensional accuracy after complex forming. 3. **Robust Weldability for Critical Joints:** While requiring qualified procedures, the normalized, fine-grained base material offers a stable and tough condition for welding critical joints in safety assemblies. 4. **Ideal for High-Value Safety-Critical Assemblies:** Enables the production of complex, high-strength, cold-formed parts with guaranteed superior performance in severe winter environments where failure is not an option. **Typical Applications** S355K2G3C is specified for the most demanding, safety-critical cold-formed components in extreme environments. * **Arctic & Offshore Engineering:** **Complex cold-formed nodes, stiffeners, and critical connection plates** for offshore platforms, ice-breaking vessels, and polar research stations. * **Defense & Safety Equipment:** **Armored vehicle components, protective structures, and bridging equipment** requiring high strength, formability for complex shapes, and guaranteed performance in extreme cold. * **Critical Transportation:** **Cold-formed safety-critical chassis and roll-over protection structures** for emergency vehicles, snowcats, and rail transport in alpine regions. * **Energy Infrastructure in Harsh Climates:** **Formed housings and structural brackets** for remote power generation stations, arctic pipelines, and offshore wind substations. * **High-Dynamic Load Machinery:** **Components for forestry and mining equipment** where impact loads and sub-zero temperatures coincide. **Available Forms & Processing** * **Forms:** Primarily supplied as **normalized plates**. * **Surface:** Typically supplied as **shot blasted and primed** or **pickled and oiled (PO)** to facilitate precise forming and provide an ideal surface for high-quality welding. * **Processing:** **Optimized for high-precision, severe cold forming operations followed by critical welding.** Machinability is good. Non-Destructive Testing (NDT) is often specified post-forming and welding. --- **Critical Procurement Note** * **Specialist, High-Performance Product:** This is **not a standard commodity**. Procurement requires **direct technical consultation with advanced steel mills**. * **Full Contractual Specification is Mandatory:** The purchase order must explicitly state **"EN 10025-3 S355K2G3C"** and detail **all agreed property minima, especially the K2 impact value (≥40J at -20°C), maximum CEV, and required Z-quality** for thick plate applications. * **Performance & Safety Justification:** The significant cost is justified by **enabling mission-critical designs, ensuring absolute fabrication reliability, and providing an unmatched safety margin against brittle fracture in extreme conditions**. * **Not "High Manganese":** This label is incorrect and misleading. The correct descriptors are **"Normalized, Fine-Grained, Cold-Formable Structural Steel with Enhanced -20°C Toughness (K2 Quality)."** * **Certification:** Requires a comprehensive **Inspection Certificate 3.2** per EN 10204, including full traceability, ultra-clean chemical analysis, mechanical tests, impact tests at -20°C verifying ≥40J, grain size assessment, and often supplementary tests like CTOD for fracture mechanics validation. -:- For detailed product information, please contact sales. -: EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5839 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 S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Properties -:- For detailed product information, please contact sales. -:

Applications of EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel -:- For detailed product information, please contact sales. -:

Packing of EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality 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 2310 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