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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AISI 1340 Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Product Information
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AISI 1340 Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Synonyms
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AISI 1340 Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Product Information
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### **Product Introduction: AISI 1340 Steel, Normalized at 870°C (1600°F), Air Cooled, 13 mm (0.5 in.) Round Bar**
**Overview**
AISI 1340 steel in the **normalized at 870°C (1600°F) and air cooled** condition is a thermally processed medium-carbon manganese alloy steel supplied as a precision round bar with a **13 mm (0.5 in.) diameter**. Normalization is a critical heat treatment that refines the grain structure, homogenizes the microstructure, and relieves internal stresses from prior rolling or forging. This specific treatment—heating to 870°C followed by controlled air cooling—optimizes the steel for a combination of good machinability, uniform mechanical properties, and dimensional stability. It serves as an excellent, ready-to-machine starting material for small-diameter precision components that may undergo further heat treatment or be used directly in applications requiring a balance of strength and toughness.
**Key Features & Advantages**
* **Refined & Uniform Microstructure:** Normalization eliminates coarse, non-uniform grains, resulting in a fine, homogeneous mixture of ferrite and pearlite. This enhances toughness, ductility, and consistency throughout the bar.
* **Improved Machinability & Dimensional Stability:** The uniform, stress-relieved structure provides predictable chip formation during machining, reduces the risk of distortion, and ensures consistent part dimensions.
* **Optimal Balance of Properties:** Offers a favorable combination of strength, hardness, and ductility—superior to the as-rolled state but more machinable than a quenched & tempered condition.
* **Ideal Pre-Condition for Further Processing:** Creates a consistent, fine-grained starting condition ideal for subsequent through-hardening (quenching & tempering) or surface hardening processes, ensuring a uniform response.
* **Precision Size for Detailed Work:** The 13 mm (0.5 in.) diameter is well-suited for small, intricate parts produced on screw machines, CNC lathes, or for use as precision shafts and pins.
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### **1. Chemical Composition (Standard Conformance)**
| Element | Standard Range (%) | Key Function |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.38 – 0.43 | Provides base strength and hardenability. Medium-carbon level ensures good machinability and hardening potential. |
| **Manganese (Mn)** | 1.60 – 1.90 | **Key Alloying Element.** Significantly increases hardenability, strength, and contributes to the fine grain structure after normalization. |
| **Phosphorus (P)** | ≤ 0.035 (max) | Residual, kept low for toughness. |
| **Sulfur (S)** | ≤ 0.040 (max) | Residual, kept low. **Not a free-machining grade.** |
| **Silicon (Si)** | 0.15 – 0.35 | Deoxidizer; strengthens ferrite. |
| **Iron (Fe)** | Balance | Base element. |
**Key International Standard Equivalents:**
* **UNS:** G13400
* **AISI/SAE:** 1340
* **ASTM:** A29 (with normalization specified)
* **DIN (Germany):** ~1.1167 / 38Mn6 (Close analogue)
* **EN (Europe):** 1.1167 / 38Mn6
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### **2. Typical Physical & Mechanical Properties (Normalized at 870°C / 1600°F, Air Cooled, 13 mm dia.)**
*Note: Properties are for the normalized condition. The small diameter ensures rapid, uniform air cooling.*
| Property | Typical Value / Description |
| :--- | :--- |
| **Density** | 7.85 g/cm³ |
| **Tensile Strength** | 650 – 800 MPa (94 – 116 ksi) |
| **Yield Strength (0.2% Offset)** | 400 – 550 MPa (58 – 80 ksi) |
| **Elongation (in 50mm)** | 18% – 24% |
| **Reduction of Area** | 45% – 60% |
| **Brinell Hardness (HB)** | 200 – 240 |
| **Machinability (Comparison)** | Fair (~50-55% of AISI 1212). Good for an alloy steel in this condition. |
| **Microstructure** | Fine, uniform lamellar pearlite in a ferrite matrix. |
| **Surface Condition** | Typically descaled (shot blasted or pickled), with a uniform heat treatment oxide tint. |
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### **3. Product Applications**
This material is specified for small, high-quality components that require reliable properties and good machinability, often as a precursor to final hardening.
* **Precision Shafts and Pins:** Small drive shafts, guide pins, dowel pins, and actuator rods for instruments, automotive systems, and machinery.
* **Gear and Sprocket Blanks:** Blanks for small-to-medium precision gears and sprockets that will be machined and then case-hardened or through-hardened.
* **Fasteners and Studs:** High-strength bolts, studs, and pins that may be machined and then heat-treated.
* **Automotive Components:** Small transmission parts, valve train components, and linkage parts.
* **General High-Quality Machine Parts:** Any component where the normalized condition provides the optimal combination of machinability, strength, and consistency for further processing or final use.
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### **4. Heat Treatment Process & Considerations**
* **Normalization Process:** The steel is uniformly heated to **870°C (1600°F)**, held to achieve complete austenitization and homogeneity, then **cooled in still air**. For a 13 mm bar, this provides a relatively fast and uniform cooling rate.
* **Purpose:** Grain refinement, stress relief, homogenization, and improvement of toughness and ductility over the as-rolled state.
* **Advantage for Small Diameters:** The 13 mm size ensures the entire cross-section cools at a similar rate, resulting in very uniform properties from surface to core.
* **Comparison to Other Conditions:**
* **vs. As-Rolled:** More uniform, refined microstructure; higher and more consistent strength/toughness; stress-relieved.
* **vs. Annealed:** Higher strength and hardness; finer grain size; better toughness.
* **vs. Quenched & Tempered:** Lower strength/hardness but vastly better machinability and no tempering required. Serves as a pre-hardened machining stock.
* **Post-Treatment:** The oxide scale from heat treatment is typically removed. The bar is straight and ready for precision machining.
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AISI 1340 Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5023 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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AISI 1340 Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Properties
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Applications of AISI 1340 Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round
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Chemical Identifiers AISI 1340 Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round
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Packing of AISI 1340 Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round
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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 1494 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
