1,We Manufacturing processes are primarily classified into four types:
1:Forging,
2:Casting,
3:Cutting,
4:Rolling.
2,We can manufacture in accordance with these standards.
Standards:
GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards).
Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others.
The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160.
The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500.
Flange Classification
1. **According to Chemical Industry Standards:** Flanges are classified as follows:
Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)).
2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows:
Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation).
3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows:
Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange.
4. **According to Connection Method/Type:** Flanges are classified as follows:
Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc.
5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges.
6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges.
A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts."
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EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **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.
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**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.
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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
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EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355K2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Standard Packing:
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Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Flange 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
