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 S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **Product Name:** EN S355J2G4C Structural Steel for Cold Forming, Thermomechanically Rolled, Quality Grade
**Overview**
EN S355J2G4C is a **premium, multi-attribute structural steel** that integrates the most advanced properties for modern heavy fabrication. It is a **thermomechanically rolled (TMCP), fine-grained steel** with **guaranteed impact toughness at -20°C (J2)** and a **chemical composition explicitly optimized for superior cold formability (C)**. This grade represents the pinnacle of material engineering for applications demanding a complex combination of high strength, exceptional low-temperature toughness, excellent weldability, and the ability to undergo severe cold-forming operations. It leverages state-of-the-art TMCP technology to create a fine-grained, ductile microstructure that is fundamentally suited for deformation. It is categorically **not a "High Manganese" steel**; its performance is derived from ultra-lean alloy design, precise microalloying, and sophisticated process 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 a supplementary chemical specification, enforcing stricter limits on residual elements.
* **Grade & Designation Decoding:** **S355J2G4C**
* **S:** Structural Steel.
* **355:** Minimum yield strength in MPa (for nominal thickness ≤ 16mm).
* **J2:** Quality designation, guaranteeing impact energy at **-20°C**.
* **G4/M:** Delivery condition: **Thermomechanically rolled (TMCP)**.
* **C:** Supplementary designation for **steels intended for cold forming**.
* **Core Concept:** This is a **specialist, fabrication-enabling steel** that combines four key attributes into one material: 1) High Strength (S355), 2) Certified Low-Temperature Toughness (-20°C), 3) Modern, Weldable TMCP Structure (G4), and 4) Enhanced Cold Formability (C). It is designed for the manufacturing sequence: **Cut → Severe Cold Forming → Welding → Service at -20°C**.
* **Clarification on "High Manganese":** This term is **technically incorrect and obsolete**. The manganese content is carefully balanced within a lean alloy design focused on achieving a low Carbon Equivalent (CEV) for weldability. The material's value is in its **processing and formability, not in high alloy content**.
**Chemical Composition (Ladle Analysis, % by weight, typical for premium TMCP with 'C' requirement)**
Ultra-clean, lean, and precisely engineered for TMCP response and maximum ductility.
* **Carbon (C):** **Very Low, typically ≤ 0.08 - 0.10%** (Core to achieving ultra-low CEV and supreme formability).
* **Manganese (Mn):** **1.30% - 1.60%** (Balanced to provide necessary strength with minimal impact on CEV and formability).
* **Phosphorus (P):** ≤ **0.015%** (Extremely low to eliminate cold shortness completely).
* **Sulphur (S):** ≤ **0.005%** (Ultra-low, typically calcium-treated; critical for flawless edge formability, surface quality, and through-thickness ductility).
* **Silicon (Si):** ≤ **0.40%**.
* **Aluminum (Alt):** ≥ **0.020%** (For grain refinement).
* **Microalloys (Nb, Ti):** Precisely added in minute amounts (e.g., Nb 0.02-0.04%, Ti 0.01-0.02%) for potent grain size control during TMCP.
* **Carbon Equivalent (CEV):** **Exceptionally low, typically ≤ 0.32 - 0.35**. This is the single most important parameter, granting **outstanding weldability with minimal pre-heat requirements**.
**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 much higher, e.g., >26%).
* **Impact Energy (KV):** **≥ 27 J at -20°C** (Longitudinal). Actual values are typically **> 60 J at -40°C**, providing a large safety margin.
* **Fine Grain Size:** Extremely fine, typically **ASTM 10 or finer**.
* **Cold Formability:** **Outstanding.** The primary feature. 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 (down to 1t), and complex stamping** with excellent surface quality and negligible risk of edge cracking.
* **Density:** **~7.85 g/cm³**.
**Product Features**
1. **Unparalleled Fabrication Flexibility:** Unites best-in-class **cold formability** with best-in-class **weldability** (due to ultra-low CEV) in a material with certified **-20°C (and beyond) toughness**. This drastically simplifies and de-risks complex manufacturing processes.
2. **TMCP Efficiency & Consistency:** Achieves required high strength and toughness without post-rolling heat treatment. The process yields highly consistent mechanical and forming properties batch-to-batch.
3. **Enables Lightweight & Innovative Designs:** Allows engineers to specify high-strength S355 steel in complex, cold-formed shapes that were previously impossible or risky with conventional steels, enabling significant weight savings and design innovation.
4. **Reduces Total Manufacturing Cost:** While having a premium purchase price, it reduces total cost by **minimizing scrap from forming cracks, eliminating or reducing pre-heat for welding, and avoiding secondary heat treatments.**
**Typical Applications**
This grade is specified for the most demanding, high-value components in advanced industries.
* **Arctic & Offshore Engineering:** **Complex cold-formed nodes, stiffeners, and platform modules** for offshore structures and vessels operating in polar regions.
* **Next-Generation Commercial Vehicles:** **High-strength, cold-formed safety-critical chassis components and cab structures** for electric and autonomous trucks designed for global operation.
* **Specialized Mobile Machinery:** **Articulated frames, boom sections, and protective ROPS/FOPS cabs** for forestry, mining, and construction equipment in extreme climates.
* **Energy Transition Infrastructure:** **Formed sections for hydrogen storage and transport modules, offshore wind turbine internals, and tidal power components**.
* **Rail & Transportation:** **Cold-formed structural elements for high-speed train underframes and locomotive bodies** requiring optimal safety in cold environments.
**Available Forms & Processing**
* **Forms:** Primarily supplied as **thermomechanically rolled sheet, strip (in coils for roll-forming lines), and plates**.
* **Surface:** Typically supplied as **pickled and oiled (PO)** or with a advanced protective coating (e.g., ECO-PICKLE) ideal for critical forming and painting processes.
* **Processing:** **Optimized for high-precision, high-severity cold forming.** Welding is exceptionally straightforward; low heat input processes (e.g., GMAW-pulse) are recommended to preserve the fine HAZ microstructure.
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**Critical Procurement Note**
* **Specialist, Non-Standard Product:** This is **not a catalogue item**. Procurement requires **early technical engagement with a limited number of world-leading steel mills** capable of this specific TMCP + ultra-clean chemistry production.
* **Full Contractual Specification is Mandatory:** The purchase order must explicitly state **"EN 10025-4 S355J2G4C"** and detail **all agreed property minima, especially impact values at defined temperatures, maximum CEV, and required Z-quality** for thick plate.
* **Justification is Performance-Based:** The cost is justified by **enabling otherwise impossible designs, guaranteeing fabrication success with near-zero scrap, and providing unparalleled lifecycle reliability in severe environments**.
* **Not "High Manganese":** This label is fundamentally wrong. The correct descriptors are **"Ultra-Low Carbon TMCP Steel with Enhanced Cold Formability and Guaranteed -20°C Toughness."**
* **Certification:** Requires a comprehensive **Inspection Certificate 3.2** per EN 10204, including full traceability, chemical analysis (highlighting ultra-low C, P, S, and CEV), full mechanical tests, multi-temperature Charpy curves, grain size assessment, and often additional testing like CTOD for critical applications.
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EN S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5835 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 S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355J2G4C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355J2G4C 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 2306 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
