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 S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **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.
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**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.
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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
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EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355K2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355K2G3C 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 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
