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 S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **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.
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**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)**.
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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
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EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355K2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355K2G4C 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 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
