EN S355K2G3 High Manganese, Quality Steel Tube,Pipe

EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Tube Product Information -:- For detailed product information, please contact sales. -: EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Product Information -:- For detailed product information, please contact sales. -: # **Product Name:** EN S355K2G3 (S355K2+N) Structural Steel, Normalized, Quality Grade **Overview** EN S355K2G3 is a **high-toughness, fine-grained structural steel** specified under EN 10025-3. The "K2G3" designation indicates a material with **superior guaranteed impact toughness at -20°C (K2)**, supplied in the **normalized condition (G3 or +N)**. This grade represents a **higher tier within the S355 quality steel family**, offering not only the required strength but also **enhanced impact energy absorption** compared to the standard J2 quality. The normalized heat treatment ensures a homogeneous, refined microstructure, making it an ideal choice for critical welded structures where safety, fracture resistance, and performance in low-temperature environments are paramount. It is **not a "High Manganese" steel**; its superior toughness is achieved through fine grain practice and heat treatment. **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. * **Grade & Condition Designation:** **S355K2G3** or **S355K2+N** * **S:** Structural Steel. * **355:** Minimum yield strength (ReH) in MPa for thicknesses **≤ 16 mm**. * **K2:** **Superior quality designation.** Guarantees a higher minimum impact energy at **-20°C** compared to J2 grade. * **G3/N:** Indicates the **normalized (N)** delivery condition. Essential for achieving property uniformity. * **Key Difference from J2:** The "K" quality requires a **higher minimum impact energy value** at the same test temperature (-20°C), providing an extra margin of safety against brittle fracture. This is often specified for more critical or dynamically loaded applications. * **Common International Equivalents:** * **ASTM:** **A709 Grade 50T** (for bridge applications with toughness requirements). * **GB/T:** **Q355D** or **Q355E** (with similar low-temperature impact values). * **Specialized:** Often compliant with **EN 10225** for weldable structural steels for fixed offshore structures. **Chemical Composition (Ladle Analysis, % by weight, maximum values per EN 10025-3 for S355K2)** Composition is tightly controlled for fine grain formation and high toughness. * **Carbon (C):** ≤ **0.18%** (Low for excellent weldability and toughness). * **Manganese (Mn):** ≤ **1.60%** * **Phosphorus (P):** ≤ **0.025%** (Very low for improved toughness). * **Sulphur (S):** ≤ **0.020%** (Very low to enhance through-thickness properties). * **Silicon (Si):** ≤ **0.55%** * **Aluminum (Alt):** ≥ **0.020%** (Mandatory for grain refinement as a killing element). * **Nitrogen (N):** ≤ **0.015%** * **Microalloys (Nb, V):** May be added in controlled amounts for additional grain refinement and precipitation strengthening. * **Carbon Equivalent (CEV):** Typically ~0.38-0.42%, optimized for weldability in demanding applications. **Physical & Mechanical Properties (for normalized 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, longitudinal). * **Impact Energy (KV):** **≥ 40 J at -20°C** (Longitudinal, Charpy V-notch). **This is the defining property, higher than the 27 J required for J2 grades.** * **Fine Grain Size:** Minimum grain size **6 or finer** as per EN ISO 643. * **Yield-to-Tensile Ratio:** Typically ≤ **0.90**, ensuring good plastic deformation capacity. * **Density:** **~7.85 g/cm³**. * **Modulus of Elasticity:** **210 GPa**. **Product Features** 1. **Enhanced Fracture Toughness (Primary Feature):** The **K2 quality guarantees higher impact energy (≥40J)** at -20°C, providing a greater safety factor against brittle fracture in critical applications such as offshore nodes, dynamically loaded bridges, and seismic structures. 2. **Normalized Homogeneity (G3):** The normalization heat treatment refines the grain structure, relieves internal stresses, and ensures uniform mechanical properties throughout the plate thickness, leading to predictable fabrication behavior. 3. **Excellent Weldability with Qualified Procedures:** The fine-grained, normalized base material provides a stable condition for welding. However, due to the critical nature of its applications, welding procedures must be strictly qualified (often to EN ISO 15614-1). 4. **Superior Low-Temperature Performance:** Specifically engineered for reliable service in environments where temperatures can reach **-20°C** or where high dynamic/impact loads are present at low temperatures. **Typical Applications** S355K2G3 is specified for the most demanding structural projects where failure is not an option. * **Offshore Structures:** **Critical welded nodes, braces, and decks** for fixed offshore platforms (often to EN 10225). * **Bridge Engineering:** **Heavy welded box girders, orthotropic decks, and expansion joints** in major road and railway bridges in cold climates. * **Crane & Heavy Lifting:** **Critical welds in slewing rings, boom sections, and pedestals** for heavy-duty cranes. * **Wind Energy:** **Flanges and transition pieces** for offshore wind turbine towers. * **Seismic-Resistant Construction:** **Moment-resisting frames and critical connections** in buildings located in earthquake-prone areas. **Available Forms & Processing** * **Forms:** Primarily supplied as **normalized plates**. Can also be available as normalized sections. * **Surface:** Typically with mill scale from the normalizing furnace. Often supplied shot blasted and primed for offshore/critical applications. * **Processing:** Excellent for cutting and welding. The normalized condition is stable for machining. Cold forming is possible but should be evaluated case-by-case. **Non-Destructive Testing (NDT)** like ultrasonic testing (UT) is commonly specified. --- **Critical Procurement Note** * **Specify Correct Standard:** Ensure reference to **EN 10025-3**. The "K2" quality is not available in the base standard EN 10025-2. * **Thickness-Dependent Strength:** Confirm the applicable minimum yield strength for the ordered thickness from EN 10025-3 tables. * **Superior Toughness Requirement:** The order for "K2" explicitly demands the higher impact value (≥40J). Do not confuse it with S355J2G3. * **Not "High Manganese":** This term is incorrect. The correct classification is **"Normalized Fine Grain Structural Steel with Enhanced -20°C Toughness (K2 Quality)."** * **Certification & Testing:** Will be supplied with a full **Inspection Certificate 3.1/3.2** per EN 10204, including impact test results at -20°C verifying the ≥40J value, chemical analysis, and grain size determination. Supplementary requirements like **through-thickness testing (Z-quality per EN 10164)** are highly recommended for thick plates in highly constrained welded details. -:- For detailed product information, please contact sales. -: EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Specification Dimensions Size： Diameter 20-1000 mm Length <5838 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 S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Properties -:- For detailed product information, please contact sales. -:

Applications of EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Tube -:- For detailed product information, please contact sales. -:

Packing of EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Tube -:- 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 Tube 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 2309 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