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 S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange, t>200 mm Product Information
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EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange, t>200 mm Synonyms
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EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Product Information
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# **Product Name:** EN S275J2G3 (S275J2+N) Structural Steel, Normalized, Quality Grade, Ultra-Heavy Plate (t > 200 mm)
**Overview:**
EN S275J2G3 is a **non-alloy, fine-grained structural quality steel**, defined by the European standard EN 10025-3 for normalized/normalized rolled weldable fine grain steels. The "J2G3" designation specifies a material with **guaranteed impact toughness at -20°C (J2)** supplied in the **normalized delivery condition (G3)**. For **ultra-heavy plates exceeding 200 mm in thickness**, this grade represents a high-integrity material choice for critical applications where exceptional through-thickness homogeneity, reliable low-temperature toughness, and weldability are paramount. The normalized heat treatment is essential for achieving a uniform, refined microstructure in such massive sections. It is **not a "High Manganese" steel**; its performance is derived from fine grain practice and heat treatment.
**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.
* **Grade & Condition Designation:** **S275J2G3**
* **S:** Structural Steel.
* **275:** Minimum yield strength in MPa **for thicknesses ≤ 16mm**. For t > 200mm, the actual guaranteed minimum is subject to agreement and will be significantly lower.
* **J2:** Quality designation, guaranteeing impact energy testing at **-20°C**.
* **G3/N:** Indicates the **normalized (N)** delivery condition. This is a mandatory and defining process for such heavy plate to ensure property uniformity.
* **Important Note on Thickness:** For plates with **t > 200 mm**, the standard's standard property tables do not apply. The mechanical properties are subject to **manufacturer's specification and customer agreement**. The "G2" concept (properties not applied) from EN 10025-2 is implicit here, though explicit negotiation is required.
* **Special Requirements:** For this thickness, compliance with supplementary standards for **through-thickness properties (EN 10164)** and **ultrasonic testing (EN 10160)** is non-negotiable.
**Chemical Composition (Ladle Analysis, % by weight, typical maximum values per EN 10025-3 for S275J2):**
Composition is controlled for fine grain formation, toughness, and weldability.
* **Carbon (C):** ≤ **0.18%** (Lower than standard S275J2 per EN 10025-2, for better weldability and toughness).
* **Manganese (Mn):** ≤ **1.50%**
* **Phosphorus (P):** ≤ **0.030%** (Tighter control).
* **Sulphur (S):** ≤ **0.025%** (Very low to ensure good through-thickness properties).
* **Silicon (Si):** ≤ **0.50%**
* **Nitrogen (N):** ≤ **0.015%**
* **Aluminum (Alt):** ≥ **0.020%** (Mandatory for grain refinement in fine grain steels).
* **Microalloys (Nb, V):** May be added in controlled amounts for additional grain refinement.
* **Carbon Equivalent (CEV):** Typically low (~0.38-0.42), critical for welding procedure specification.
**Physical & Mechanical Properties (for normalized condition, t > 200 mm):**
***All values for this thickness are subject to agreement. The following are typical/achievable targets.***
* **Yield Strength (ReH):** **Agreed Minimum.** Typically in the range of **≥ 240 - 260 MPa**.
* **Tensile Strength (Rm):** **Agreed Minimum.** Typically **410 - 540 MPa**.
* **Elongation at Break (A5):** **Agreed Minimum.** Typically **≥ 20%**.
* **Impact Energy (KV):** **≥ 27 J at -20°C** (This quality requirement usually holds, but **test location and orientation are critical**—typically at 1/4 thickness, longitudinal and transversal).
* **Fine Grain Size:** Minimum grain size **6 or finer** as per EN ISO 643 (ensures microstructure homogeneity).
* **Through-Thickness Properties (Z-direction):** **MUST be specified.** Minimum **Z25** per EN 10164, with **Z35** strongly recommended for highly constrained welds.
* **Ultrasonic Testing (UT):** **Mandatory.** Supplied to **EN 10160 Class S3E3** or higher (e.g., S4E4) to ensure internal soundness.
**Product Features for Ultra-Heavy Plate:**
1. **Normalized Homogeneity (G3):** The normalization heat treatment is essential for refining the grain structure, relieving internal stresses from rolling, and ensuring uniform mechanical properties throughout the massive cross-section.
2. **Guaranteed Low-Temperature Toughness:** J2 quality provides reliable performance for structures exposed to temperatures as low as **-20°C**, a common requirement for offshore, arctic, or winter construction.
3. **Fine Grain Practice:** The aluminum treatment ensures a fine, tough microstructure with improved resistance to brittle fracture.
4. **Superior Weldability (with Procedure):** The combination of low carbon, fine grain, and normalized condition provides a favorable base for welding. However, welding of such thick sections requires rigorously qualified procedures (PWPS per EN ISO 15614-1), including strict pre-heat, interpass control, and Post Weld Heat Treatment (PWHT).
**Typical Applications (for t > 200 mm):**
* **Offshore & Maritime:** **Critical nodes, chords, and stiffened panels for offshore jacket structures** and **ice-strengthened hull sections** for arctic vessels.
* **Heavy Civil Engineering:** **Pylon anchorages for long-span bridges, dam gate supports, and massive nodes in seismic-resistant structures**.
* **Power Generation:** **Core support structures in nuclear facilities, turbine generator pedestals, and hydraulic accumulator blocks**.
* **Press & Forging:** **Columns and platens for ultra-heavy forging presses** requiring high integrity.
**Available Forms & Quality Supplements:**
* **Form:** **Ultra-heavy normalized plates**.
* **Delivery Condition:** **Normalized (N)**. May be followed by stress relieving.
* **Mandatory Testing:** Full mechanical testing from defined locations (surface, 1/4t, 1/2t), Charpy tests at -20°C, chemical analysis, grain size determination, **UT report**, and macro-etch tests.
* **Certification:** **EN 10204 Type 3.2 Inspection Certificate** is standard.
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**Critical Procurement & Design Note:**
1. **Agreed Properties are Mandatory:** An order for **S275J2G3, t > 200mm** is invalid without **explicitly agreed minimum mechanical properties** (ReH, Rm, A5, impact values at -20°C).
2. **Essential Supplementary Requirements:** The order must include: **UT class, Z-quality designation (e.g., Z35), fine grain verification, and agreed chemistry limits**.
3. **Not "High Manganese":** This term is imprecise and should not be used. Focus on **"Normalized Fine Grain Steel for Ultra-Heavy Plate with -20°C Toughness."**
4. **Example Order Clause:** *"EN 10025-3 S275J2G3 (S275J2+N), t=220mm. Min ReH ≥ 250 MPa, Min Rm ≥ 480 MPa, A5 ≥ 22%, KV ≥ 40J at -20°C (1/4t, longitudinal & transversal). P≤0.020%, S≤0.008%. UT per EN 10160 S3E3. Z35 per EN 10164. Grain size ≥7 per EN ISO 643."*
**Using this grade for such thickness without explicit technical agreements is a critical engineering and procurement failure.**
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EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5823 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 S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel, t>200 mm Properties
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Applications of EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange, t>200 mm
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Chemical Identifiers EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange, t>200 mm
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Packing of EN S275J2G3 High Manganese, Structural, Hot Rolled, Quality Steel Flange, t>200 mm
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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 2294 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
