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 S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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**Product Name:** EN S235J2G3 Structural Steel, Hot Rolled, Quality Grade
**Overview:**
EN S235J2G3 is a **non-alloy structural steel** specified under the European standard EN 10025-2, belonging to the S235 strength category. The designation indicates a material with **guaranteed impact toughness at -20°C (J2)** and supplied in the **"G3" delivery condition**, which specifically denotes **normalized or normalized rolled steel**. While it offers reliable toughness for low-temperature service, it is **not technically classified as a "High Manganese" steel**. Its manganese content is standard for the S235 grade. This steel is engineered for welded, bolted, and riveted structures where enhanced low-temperature toughness and a normalized, homogeneous microstructure are required for critical applications.
**Key International Standards:**
* **Primary Standard:** **EN 10025-2:2019** - Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels.
* **Grade & Condition Designation:** **S235J2G3**
* **S:** Structural Steel.
* **235:** Minimum yield strength in MPa (for thickness ≤ 16mm).
* **J2:** Quality designation, indicating impact energy testing at **-20°C**.
* **G3:** Supplementary designation for the **delivery condition**. "G3" specifically means the product is supplied in the **normalized or normalized rolled condition**. This is a key differentiator from standard as-rolled (AR) S235J2.
* **Clarification on "High Manganese":** This is a misnomer for this grade. S235J2G3 is a **standard non-alloy quality steel** with a standard manganese range. The "G3" condition (normalizing) is its defining processing feature, not a high manganese content.
* **Equivalents & Context:** The closest equivalent in other systems would be a **normalized A36 steel with supplemental Charpy V-notch requirements at -20°F (~-29°C)**, though no direct designation exists. The "G3" condition aligns it more closely with the intent of steels for critical applications.
**Chemical Composition (Ladle Analysis, % by weight, maximum values per EN 10025-2):**
Standard composition for S235, controlled for weldability.
* **Carbon (C):** ≤ **0.17%**
* **Manganese (Mn):** ≤ **1.40%** (Standard range, not elevated).
* **Phosphorus (P):** ≤ **0.035%**
* **Sulphur (S):** ≤ **0.035%**
* **Nitrogen (N):** ≤ **0.012%** (for killed steel, which is typical for normalized delivery).
* **Silicon (Si):** Typically present as a result of the killing process for normalized steel.
**Physical & Mechanical Properties (for normalized 'G3' condition, thickness ≤ 16mm):**
The normalized condition provides a more uniform and refined grain structure compared to as-rolled material.
* **Yield Strength (ReH):** ≥ **235 MPa** (Minimum, thickness-dependent. Normalizing may result in a yield strength at the lower end of the permissible range).
* **Tensile Strength (Rm):** **360 - 510 MPa**.
* **Elongation at Break (A5):** ≥ **26%** (Minimum, longitudinal test piece).
* **Impact Energy (KV):** **≥ 27 J at -20°C** (Longitudinal, Charpy V-notch). This is the core property of the J2 quality. The normalized condition ensures consistent toughness through the thickness.
* **Microstructure:** Equiaxed, fine-grained ferrite-pearlite structure resulting from the normalizing heat treatment, leading to more isotropic properties.
* **Density:** **~7.85 g/cm³**.
* **Modulus of Elasticity:** **210 GPa**.
**Product Features:**
1. **Guaranteed Low-Temperature Toughness:** The **J2** quality ensures reliable impact resistance down to **-20°C**, making it suitable for structures exposed to cold climates, such as outdoor bridges, pylons, and storage facilities.
2. **Normalized Delivery Condition (G3):** This heat treatment refines the grain structure, improves uniformity of mechanical properties through the cross-section, relieves internal stresses from rolling, and enhances overall toughness and ductility. It provides more predictable fabrication behavior, especially for welding.
3. **Excellent Weldability:** Very low carbon content ensures excellent weldability with all common processes. The normalized condition can also simplify post-weld heat treatment (PWHT) considerations.
4. **Homogeneous Properties:** Ideal for critical components where consistent performance in all directions is required.
**Typical Applications:**
S235J2G3 is specified for structural applications where service temperatures may fall to -20°C and where material homogeneity is valued.
* **Critical Structural Components:** Parts of **transmission towers, communication masts, and light bridges** in cold regions.
* **Offshore & Maritime Accessories:** **Staircases, platforms, and secondary structures** on offshore installations and ships where -20°C toughness is specified.
* **Cold Storage & Logistics:** **Supporting structures and frames** for large cold storage warehouses or facilities in alpine environments.
* **General Engineering:** **Critical brackets, machine frames, and lifting attachments** that require verified low-temperature performance and a normalized condition for dimensional stability.
**Available Forms & Processing:**
* **Forms:** Typically supplied as **normalized plates** and **sections** (like beams and channels). The G3 condition is most relevant for thicker plates where the benefits of normalizing are most pronounced.
* **Surface:** Usually with mill scale from the normalizing furnace.
* **Processing:** Excellent for cutting and welding. The normalized condition may result in slightly different machining characteristics compared to as-rolled steel. Cold forming is possible but with awareness of the normalized structure.
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**Procurement & Specification Note:**
It is essential to specify the **full and correct designation "S235J2G3"**. Omitting "G3" will result in supply of standard as-rolled material, which may not have the same through-thickness homogeneity and stress state. The term **"High Manganese" is incorrect for this grade**. Its key features are **impact toughness at -20°C (J2)** and the **normalized delivery condition (G3)**. For applications requiring higher strength at low temperatures, grades like **S355J2** or **S355K2** should be considered. Mechanical properties are thickness-dependent, and the applicable values for the ordered thickness must be confirmed.
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EN S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5807 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 S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S235J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S235J2G3 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 2278 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
