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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ASTM class 50 Standard gray Iron Flange test bars, as cast Product Information
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ASTM class 50 Standard gray Iron Flange test bars, as cast Synonyms
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ASTM class 50 Standard gray iron test bars, as cast Product Information
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### **Product Introduction: ASTM Class 50 Standard Gray Iron Test Bars, As-Cast**
**Product Overview**
ASTM Class 50 Standard Gray Iron Test Bars are precision-cast reference specimens specifically designed for the consistent and reliable evaluation of the chemical, mechanical, and microstructural properties of gray iron. The "As-Cast" condition indicates that the bars have undergone no post-casting heat treatment, representing the material's properties directly from the foundry process. The designation "Class 50" refers to a minimum tensile strength of 50 ksi (approximately 345 MPa). These test bars serve as a critical quality control tool for foundries, material testing laboratories, and research institutions to ensure compliance with specifications and to benchmark material performance.
**Key International Standards**
The production and testing of these bars are governed by stringent international standards, ensuring global consistency and recognition:
* **ASTM A48/A48M:** *Standard Specification for Gray Iron Castings* - This is the primary specification defining the grades (classes) of gray iron based on tensile strength measured from separately cast test bars.
* **ASTM A438:** *Standard Test Method for Transverse Testing of Gray Iron Castings* - Often used in conjunction with or as an alternative to tensile testing for evaluating strength.
* **ISO 185:** *Grey cast irons — Classification* - The international equivalent, where a tensile strength of 345 MPa corresponds to Grade GC 350.
**Typical Chemical Composition**
The chemistry is balanced to achieve the required Class 50 strength while maintaining good castability and characteristic gray iron microstructure (graphite flakes in a ferritic/pearlitic matrix).
| Element | Composition Range (%) | Role & Influence |
| :--- | :--- | :--- |
| **Carbon (C)** | 3.00 - 3.60 | Primary graphitizing element; ensures graphite formation and castability. |
| **Silicon (Si)** | 1.80 - 2.40 | Strong graphitizer; promotes ferrite, controls pearlite content, and influences hardness. |
| **Manganese (Mn)** | 0.60 - 1.00 | Stabilizes pearlite and combines with sulfur to form MnS inclusions. |
| **Phosphorus (P)** | 0.15 max | Improves fluidity but forms hard, brittle phosphide eutectic at higher levels. |
| **Sulfur (S)** | 0.15 max | Tends to inhibit graphitization; controlled to prevent chill and poor machining. |
| **Chromium (Cr)**| 0.10 - 0.40 | Pearlite stabilizer and carbide promoter; used to increase strength and hardness. |
*(Note: Exact composition may vary slightly between manufacturers to achieve the target properties.)*
**Physical & Mechanical Properties (Typical As-Cast)**
Properties are measured on standard test bars (e.g., ASTM A48 sand-cast bar with a diameter of 1.2 inches / 30 mm).
| Property | Typical Value | Test Standard |
| :--- | :--- | :--- |
| **Tensile Strength, min.** | 50 ksi (345 MPa) | ASTM A48, ASTM E8 |
| **Hardness (Brinell)** | 187 - 241 HBW | ASTM E10 |
| **Modulus of Elasticity** | 14 - 22 x 10^6 psi (97 - 152 GPa) | — |
| **Density** | 0.26 lb/in³ (7.2 g/cm³) | — |
| **Microstructure** | Type A Graphite Flakes in a Matrix of Pearlite and Ferrite | ASTM A247 |
| **Compressive Strength** | ~3-4 x Tensile Strength | — |
| **Damping Capacity** | Excellent | — |
**Product Applications & Purpose**
These test bars are not functional components but are essential **quality assurance and R&D tools**. Their primary applications include:
* **Foundry Process Control:** To verify that the melting, inoculation, and pouring practices consistently produce iron meeting the Class 50 specification.
* **Material Certification:** Supplied with production castings to provide documented proof of material grade compliance to customers.
* **Laboratory Testing:** Used by third-party labs for material verification, comparative studies, and failure analysis.
* **Research & Development:** For developing new alloy compositions, studying the effects of process variables, and calibrating testing equipment.
* **Machinability Studies:** Serving as standard material samples for testing tool wear, cutting speeds, and surface finish.
**Ordering Information**
When ordering, specify: **"ASTM Class 50 Gray Iron Test Bars, As-Cast"** along with the required dimensions (typically per ASTM A48, e.g., 1.2" diameter), quantity, and any needed certification (e.g., foundry test report with chemical analysis and tensile results).
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This product is indispensable for any stakeholder requiring verifiable, standardized data on the fundamental properties of Grade 50 gray iron, bridging the gap between foundry practice and engineered component performance.
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ASTM class 50 Standard gray iron test bars, as cast Specification
Dimensions
Size：
Diameter 20-1000 mm Length <6513 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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ASTM class 50 Standard gray iron test bars, as cast Properties
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Applications of ASTM class 50 Standard gray Iron Flange test bars, as cast
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Chemical Identifiers ASTM class 50 Standard gray Iron Flange test bars, as cast
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Packing of ASTM class 50 Standard gray Iron Flange test bars, as cast
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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 2984 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
