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 S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange Product Information
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EN S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange Synonyms
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EN S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Product Information
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# **Product Name:** EN S355J2G3C Structural Steel for Cold Forming, Normalized, Quality Grade
**Overview**
EN S355J2G3C is a **high-performance, multi-attribute structural steel** representing the convergence of four critical engineering specifications into a single material designation. It is a **normalized, fine-grained steel (G3)** with **guaranteed impact toughness at -20°C (J2)** and a **chemical composition explicitly optimized for superior cold formability (C)**. This grade is engineered for the most demanding fabrication scenarios involving severe cold-forming operations on high-strength material that must subsequently deliver reliable performance in low-temperature service environments (down to -20°C). The normalization treatment ensures a homogeneous and stress-relieved microstructure, providing an ideal, stable base for complex deformation. It is **not a "High Manganese" steel**; its capabilities are defined by processing and chemical control, not by elevated manganese content.
**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.
* The "C" (cold forming) supplementary requirement is applied, drawing from the chemical principles of EN 10025-2.
* **Grade & Designation Decoding:** **S355J2G3C**
* **S:** Structural Steel.
* **355:** Minimum yield strength in MPa (for nominal thickness ≤ 16mm).
* **J2:** Quality designation, guaranteeing impact energy at **-20°C**.
* **G3/N:** Delivery condition: **Normalized**.
* **C:** Supplementary designation for **steels intended for cold forming**.
* **Core Concept:** This is a **premium, fabrication-centric steel** integrating four key attributes: 1) High Strength (S355), 2) Low-Temperature Toughness (-20°C), 3) Normalized Homogeneity (G3), 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 is **technically inaccurate and misleading**. Manganese content is controlled as part of a balanced alloy design for strength and hardenability. The material's premium is in its **normalized structure, guaranteed -20°C toughness, and certified cold formability**.
**Chemical Composition (Ladle Analysis, % by weight, typical based on EN 10025-3 for S355J2 with 'C' grade limits)**
Chemistry is tightly controlled for fine grain formation, toughness, and maximum ductility.
* **Carbon (C):** ≤ **0.18%** (Low for excellent weldability and formability; typical for fine-grained steels).
* **Manganese (Mn):** ≤ **1.60%** (Standard range for S355, not specially elevated).
* **Phosphorus (P):** ≤ **0.025%** (**Key Differentiator** - Tighter than standard S355J2's ≤0.030%, critical for preventing cold cracking during forming).
* **Sulphur (S):** ≤ **0.020%** (**Key Differentiator** - Tighter than standard ≤0.025%, essential for superior edge ductility and through-thickness properties).
* **Silicon (Si):** ≤ **0.55%**.
* **Aluminum (Alt):** ≥ **0.020%** (Mandatory for grain refinement).
* **Nitrogen (N):** ≤ **0.015%**.
* **Carbon Equivalent (CEV):** Typically moderate (~0.38-0.42). The normalized condition mitigates some welding challenges associated with this CEV.
**Physical & Mechanical Properties (for normalized 'G3' 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, typically higher due to favorable structure and chemistry).
* **Impact Energy (KV):** **≥ 27 J at -20°C** (Longitudinal, Charpy V-notch). The normalized, fine-grained structure ensures consistent toughness.
* **Fine Grain Size:** Minimum grain size **6 or finer** (EN ISO 643).
* **Cold Formability:** **Excellent.** The primary feature. The combination of a normalized, ductile ferrite-pearlite microstructure and very low P/S content allows for severe cold deformation (deep drawing, tight-radius bending, complex stamping) with minimal risk of cracking.
* **Density:** **~7.85 g/cm³**.
**Product Features**
1. **Uncompromised Performance in Complex Fabrication:** Unites high-strength, low-temperature toughness, and excellent cold formability in one material, eliminating the typical engineering compromises when designing for cold climates.
2. **Stable & Predictable Forming Base:** The normalized condition provides a homogeneous, stress-relieved starting condition, leading to consistent springback behavior and dimensional accuracy after forming.
3. **Robust Weldability:** While CEV requires proper procedure qualification, the normalized base material offers a stable condition for welding. Post-forming welding is reliable with appropriate pre-heat for thicker sections.
4. **Ideal for High-Value Critical Assemblies:** Enables the production of complex, high-strength, cold-formed parts with guaranteed performance in severe winter environments.
**Typical Applications**
S355J2G3C is specified for high-value, safety-critical cold-formed components in demanding sectors.
* **Arctic & Cold-Climate Mobile Machinery:** **Complex cold-formed structural frames, booms, and cabs** for forestry, mining, and construction equipment operating below -20°C.
* **Specialized Transportation:** **Critical cold-formed chassis components and safety structures** for heavy-duty trucks, rescue vehicles, and rail transport in alpine or northern regions.
* **Energy Infrastructure:** **Formed housings, brackets, and access platforms** for offshore wind turbine towers, transformer stations, and remote power generation facilities exposed to harsh winters.
* **Defense & Safety Equipment:** **Components for shelters, bridging equipment, and specialized vehicles** requiring high strength, formability, and guaranteed low-temperature performance.
**Available Forms & Processing**
* **Forms:** Primarily supplied as **normalized plates** and **sheet**.
* **Surface:** Often supplied as **pickled and oiled (PO)** or with a specialized protective coating to facilitate critical cold forming and provide a clean welding surface.
* **Processing:** **Optimized for high-precision, severe cold forming operations (stamping, press-braking) followed by welding.** Machinability is good.
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**Critical Procurement Note**
* **Specialist Product:** This is not a standard stock item. It requires **direct consultation and ordering from mills** capable of producing normalized fine-grained steel to the "C" grade chemistry.
* **Full Specification is Mandatory:** The purchase order must explicitly state **"EN 10025-3 S355J2G3C"** and detail any additional requirements (e.g., specific CEV max, Z-quality for thicker plates).
* **Performance-Based Justification:** The cost premium is justified by **enabling complex designs, ensuring fabrication success (low scrap), and guaranteeing end-performance in extreme conditions**, potentially eliminating the need for more expensive alloys or sub-assemblies.
* **Not "High Manganese":** This label is incorrect. The correct descriptors are **"Normalized, Fine-Grained, Cold-Formable Structural Steel with -20°C Toughness."**
* **Certification:** Requires a comprehensive **Inspection Certificate 3.1/3.2** per EN 10204, including full chemical analysis (highlighting low P/S), mechanical tests, impact tests at -20°C, and grain size assessment.
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EN S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5833 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 S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Properties
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Applications of EN S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Chemical Identifiers EN S355J2G3C High Manganese, Structural, Hot Rolled, Quality Steel Flange
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Packing of EN S355J2G3C 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 2304 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
