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 S235JR Structural, Hot Rolled, Base Steel Flange, 16 mm < t < 25 mm Product Information
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EN S235JR Structural, Hot Rolled, Base Steel Flange, 16 mm < t < 25 mm Synonyms
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EN S235JR Structural, Hot Rolled, Base Steel, 16 mm < t < 25 mm Product Information
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**Product Name:** EN S235JR Structural Steel, Hot Rolled, Base Material, Thickness 16 mm < t < 25 mm
**Overview:**
EN S235JR is the **most fundamental and widely used non-alloy structural steel** in Europe, classified as a **base material** under the EN 10025-2 standard. It represents the baseline quality level (“JR”) with impact properties tested at room temperature (+20°C). Supplied in the hot-rolled condition, it offers an excellent balance of adequate strength, exceptional weldability, and good formability at a highly competitive cost. This product is specified for the thickness range **>16 mm to ≤25 mm**, covering a common range for many structural plates and sections.
**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 & Quality Designation:** **S235JR**
* **S:** Structural Steel
* **235:** Minimum yield strength in MPa for nominal thickness ≤ 16mm.
* **JR:** The basic quality designation. **'J'** indicates the steel is impact tested (Charpy V-notch), and **'R'** denotes the test temperature is **Room Temperature (+20°C)**.
* **Clarification:** This is a **Base Steel**, not a "Quality Steel" with guaranteed low-temperature toughness like J0, J2, etc. It is the economical choice for general applications without specific low-temperature requirements.
* **Common International Equivalents:**
* **ASTM:** **A36** (the most common direct counterpart, though chemistry differs).
* **JIS:** **SS400**.
* **GB/T:** **Q235B**.
* **ISO:** **ISO 630-2:2021, Grade Fe360B** (historical Fe 360).
**Chemical Composition (Ladle Analysis, % by weight, maximum values for thickness >16mm - 40mm):**
Standard composition optimized for cost and manufacturability.
* **Carbon (C):** ≤ **0.17%**
* **Manganese (Mn):** ≤ **1.40%**
* **Phosphorus (P):** ≤ **0.045%**
* **Sulphur (S):** ≤ **0.045%**
* **Nitrogen (N):** ≤ **0.014%** (For killed steel, common in this thickness range).
* **Note:** For this thickness range, the steel is typically **“killed”** (fully deoxidized with silicon or aluminum), resulting in a more homogeneous internal structure suitable for welding.
**Physical & Mechanical Properties (for hot-rolled condition, thickness >16mm to ≤25mm):**
* **Yield Strength (ReH):** ≥ **235 MPa** (Minimum guaranteed value for this thickness range. This is the key design property).
* **Tensile Strength (Rm):** **360 - 510 MPa**.
* **Elongation at Break (A5):** ≥ **25%** (Minimum on longitudinal test piece, indicating good ductility).
* **Impact Energy (KV):** ≥ **27 J at +20°C** (Longitudinal, Charpy V-notch). **Critical Note:** This is valid only for temperatures at or above **+20°C**. No toughness guarantee exists for lower temperatures.
* **Density:** **7.85 g/cm³**.
* **Modulus of Elasticity (Young's Modulus):** **210,000 MPa (210 GPa)**.
* **Shear Modulus:** **81,000 MPa (81 GPa)**.
* **Poisson's Ratio:** **0.3**.
**Product Features:**
1. **Cost-Effectiveness:** The most economical structural steel grade for a vast range of applications.
2. **Excellent Weldability:** Extremely low carbon equivalent allows for easy welding with all common processes (SMAW, MAG/MIG, SAW) without pre-heating requirements for most thicknesses and joint configurations.
3. **Good Formability:** Excellent for cold bending, shearing, and punching operations.
4. **Proven Reliability:** A globally recognized and trusted material with well-understood behavior.
**Typical Applications:**
S235JR in this plate/section thickness range is ubiquitous in general construction and manufacturing:
* **Building & Construction:** Plates for **base plates, column stiffeners, gusset plates**, and **general fabrication** in commercial and industrial buildings.
* **General Fabrication:** **Machine frames, guards, platforms, stair treads, and non-critical structural brackets**.
* **Transport & Logistics:** **Trailer floors, container components, and storage rack uprights** (for lighter duties).
* **Industrial Equipment:** **Housings, covers, and supports** for non-safety-critical machinery.
* **Piping & Ductwork:** **Support structures and non-pressure parts**.
**Available Forms & Processing (for thickness 16-25mm):**
* **Forms:** **Hot-rolled plates, flat bars, and structural sections** (like IPE/HEA beams, UNP channels, and angles) within this thickness range.
* **Surface:** Standard mill scale. Can be shot blasted or primed upon request.
* **Processing:** Ideal for **shearing, plasma/laser cutting, drilling, welding, and cold bending**.
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**Critical Selection & Procurement Note:**
* **Temperature Limitation:** The **JR quality has NO guaranteed impact properties below +20°C**. It is **NOT suitable** for dynamically loaded structures or primary structures exposed to service temperatures below **0°C** without rigorous engineering assessment. For such applications, specify **S235J0 (0°C)** or **S235J2 (-20°C)**.
* **Thickness vs. Strength:** The guaranteed minimum yield strength of **235 MPa applies to this specific thickness range (16-25mm)**. For thicker sections, the minimum yield strength is reduced as per EN 10025-2 tables (e.g., ≥225 MPa for t > 40mm).
* **Specification:** Always specify the full grade **“S235JR”** and the required thickness. For critical applications, consider ordering with supplementary requirement for **killed steel** to ensure better internal soundness for welding.
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EN S235JR Structural, Hot Rolled, Base Steel, 16 mm < t < 25 mm Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5811 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 S235JR Structural, Hot Rolled, Base Steel, 16 mm < t < 25 mm Properties
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Applications of EN S235JR Structural, Hot Rolled, Base Steel Flange, 16 mm < t < 25 mm
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Chemical Identifiers EN S235JR Structural, Hot Rolled, Base Steel Flange, 16 mm < t < 25 mm
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Packing of EN S235JR Structural, Hot Rolled, Base Steel Flange, 16 mm < t < 25 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 2282 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
