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 S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **Product Name:** EN S355J2G4 (S355J2+M) Structural Steel, Thermomechanically Rolled, Quality Grade
**Overview**
EN S355J2G4 is a **thermomechanically controlled processed (TMCP), fine-grained structural steel** specified under EN 10025-4. The "J2G4" designation indicates a material with **guaranteed impact toughness at -20°C (J2)**, supplied in the **thermomechanically rolled condition (G4 or +M)**. This modern processing route delivers an exceptional combination of high strength, superior low-temperature toughness, and excellent weldability without requiring a separate normalizing heat treatment, making it both a high-performance and cost-effective choice. It is **not a "High Manganese" steel**; its properties are achieved through advanced rolling technology, precise temperature control, and microalloying, not through elevated manganese content.
**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.
* **Grade & Condition Designation:** **S355J2G4** or **S355J2+M**
* **S:** Structural Steel.
* **355:** Minimum yield strength (ReH) in MPa for thicknesses **≤ 16 mm**.
* **J2:** Quality designation, guaranteeing impact energy testing at **-20°C**.
* **G4/M:** Indicates **thermomechanical rolling (TMCP, M)**. This is a sophisticated, computer-controlled rolling process within specific temperature ranges to achieve the final properties.
* **Important Distinction:** This grade is part of the **fine-grained steel** family. The TMCP process is designed to produce a very fine grain structure, which is the key to its enhanced toughness and strength.
* **Common International Equivalents:**
* **ASTM:** **A841** (Specification for steel plates produced via the TMCP process). **A709 Grade 50** is a strength equivalent.
* **GB/T:** **Q355D** (though typically normalized, TMCP variants exist).
* **ISO:** **ISO 630-2:2021, Grade E355**, with additional TMCP condition.
**Chemical Composition (Ladle Analysis, % by weight, typical maximum values per EN 10025-4 for S355J2)**
Lean, clean chemistry optimized for the TMCP process response.
* **Carbon (C):** ≤ **0.16%** (Generally lower than normalized grades, crucial for weldability).
* **Manganese (Mn):** ≤ **1.60%**
* **Phosphorus (P):** ≤ **0.025%** (Low for toughness).
* **Sulphur (S):** ≤ **0.020%** (Low for improved weldability and formability).
* **Silicon (Si):** ≤ **0.55%**
* **Aluminum (Alt):** ≥ **0.020%** (For grain refinement).
* **Nitrogen (N):** ≤ **0.015%**
* **Microalloys (Nb, Ti, V):** Precisely added in small amounts (e.g., Nb ≤ 0.05%, Ti ≤ 0.03%) to control recrystallization and precipitation during rolling, enabling grain refinement and strengthening.
* **Carbon Equivalent (CEV):** Typically low, often **≤ 0.40**. This is a **major technical advantage**, significantly improving weldability by reducing pre-heat requirements and the risk of hydrogen-induced cracking.
**Physical & Mechanical Properties (for thermomechanical 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):** **≥ 27 J at -20°C** (Longitudinal, Charpy V-notch). Actual values are often much higher due to the fine-grained structure.
* **Fine Grain Size:** Minimum grain size **6 or finer** (EN ISO 643).
* **Density:** **~7.85 g/cm³**.
* **Modulus of Elasticity:** **210 GPa**.
**Product Features**
1. **Excellent Weldability (Key Feature):** The **low carbon equivalent (CEV)** is the standout benefit. It allows for welding with **lower or no pre-heat** in many applications, simplifies welding procedures, reduces fabrication time and cost, and minimizes the risk of cold cracking.
2. **Superior Toughness:** The thermomechanical process produces an exceptionally fine grain structure, resulting in excellent and consistent impact toughness at **-20°C** and often at even lower temperatures.
3. **Cost-Effective Production:** Properties are achieved in-line during rolling, eliminating the energy and time costs of a separate normalizing heat treatment.
4. **Good Strength-Toughness Balance:** Provides an optimal combination for dynamically loaded structures in cold environments.
**Typical Applications**
S355J2G4 is the material of choice for modern, efficiently fabricated critical structures, especially where welding is a major activity.
* **Bridge Construction:** **Welded plate girders, box sections, and orthotropic decks** for roads and railways in cold climates.
* **Offshore & Marine:** **Jacket braces, nodes, decks for offshore platforms, and hull structures** for ice-class vessels.
* **Heavy Mobile Equipment:** **Welded frames and booms for cranes, excavators, and mining trucks** operating in winter conditions.
* **Renewable Energy:** **Towers and foundations for onshore and offshore wind turbines**.
* **Building Construction:** **High-rise building cores, moment-resisting frames, and other critical seismic or high-load elements**.
**Available Forms & Processing**
* **Forms:** Commonly supplied as **thermomechanically rolled plates**. Also increasingly available as **TMCP structural sections** (e.g., HEA/HEB beams).
* **Surface:** With standard mill scale from rolling.
* **Processing:** Excellent for all cutting and welding processes. **Welding heat input should be controlled** (medium-low recommended) to avoid coarsening the fine-grained microstructure in the Heat-Affected Zone (HAZ). Good cold forming capability.
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**Critical Procurement Note**
* **Specify Correct Standard:** Ensure reference to **EN 10025-4**, not EN 10025-2 or -3.
* **Thickness-Dependent Strength:** Always use the correct guaranteed yield strength from the EN 10025-4 tables for your specific product thickness in design calculations.
* **Welding Advantage:** Actively communicate the low CEV to the fabricator to optimize welding procedures (potentially allowing lower pre-heat), which can lead to significant cost and time savings.
* **Not "High Manganese":** This term is incorrect and should not be used. The correct classification is **"Thermomechanically Rolled Fine Grain Structural Steel with -20°C Toughness."**
* **Microalloy Sensitivity:** The fine-grained HAZ can be sensitive to high heat input. Welding procedures should be qualified accordingly.
* **Certification:** Supplied with an **Inspection Certificate 3.1** per EN 10204, confirming chemistry (noting microalloys), mechanical properties, impact tests at -20°C, and grain size.
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EN S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5834 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 S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355J2G4 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355J2G4 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 2305 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
