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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Latrobe BR-3® High Carbon-Medium Chromium Die Steel Flange (AISI A7) Product Information
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Latrobe BR-3® High Carbon-Medium Chromium Die Steel Flange (AISI A7) Synonyms
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Latrobe BR-3® High Carbon-Medium Chromium Die Steel (AISI A7) Product Information
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# **Latrobe BR-3® High Carbon-Medium Chromium Die Steel (AISI A7)**
## **Product Overview**
Latrobe BR-3® is a premium-grade, high-carbon, medium-chromium, air-hardening cold work tool steel conforming to AISI A7 classification. Renowned for its **exceptional abrasive wear resistance**—ranking among the highest of all commercial tool steels—BR-3® is specifically engineered for applications where wear is the primary failure mechanism. Its unique alloy composition results in a high volume of hard, complex carbides, making it the material of choice for blanking, forming, and punching abrasive materials over very long production runs.
## **Key Features & Benefits**
* **Unmatched Abrasive Wear Resistance:** Exceptionally high carbon and tungsten content combined with chromium and vanadium creates a large volume of hard, primary carbides, providing superior resistance to wear in severe applications.
* **Good Dimensional Stability:** As an air-hardening steel, it offers minimal distortion during heat treatment compared to oil-hardening grades, suitable for maintaining precision in complex die geometries.
* **High Compressive Strength:** Capable of withstanding significant pressure without deformation, essential for cold forming and stamping operations.
* **Limited Machinability in Annealed State:** Due to its high alloy content and carbide volume, machinability is fair; however, it offers **excellent grindability in the hardened state** for final tool finishing.
* **Moderate Toughness:** While wear-resistant, its toughness is lower than many other cold work steels (e.g., A2, D2). It is best suited for applications with minimal impact or shock loading.
## **International Standard & Designations**
* **Primary Standard:** **ASTM A681-08 (R2019):** Standard Specification for Tool Steel Alloy.
* **Grade:** **A7**
* **Unified Numbering System (UNS):** **T30107**
* **Common International Equivalents:**
* **ISO:** No direct equivalent; functionally similar to very high-carbon, high-chromium types.
* **Germany (DIN/W-Nr.):** Approximated by **~1.2365** (X155CrVMo12-1) in terms of wear resistance, though chemistry differs.
* **Japan (JIS):** No direct JIS equivalent.
## **Chemical Composition (%, typical - AISI A7)**
| Carbon (C) | Chromium (Cr) | Tungsten (W) | Molybdenum (Mo) | Vanadium (V) | Manganese (Mn) | Silicon (Si) | Iron (Fe) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 2.00 - 2.50 | 5.00 - 5.75 | 0.50 - 1.50 | 0.70 - 1.40 | 0.50 - 1.00 | 0.20 - 0.50 | 0.20 - 0.50 | Balance |
*Note:* The extremely high carbon content (>2.0%) is a defining characteristic, leading to its exceptional wear resistance and high attainable hardness.
## **Physical & Mechanical Properties (Typical)**
| Property | Value / Description |
| :--- | :--- |
| **Density** | ~7.8 g/cm³ (0.282 lb/in³) |
| **Hardness (Annealed)** | 235-265 HB (Brinell) |
| **Hardness (Heat Treated)** | **64 - 67 HRC** (Typical optimal working range for maximum wear resistance) |
| **Austenitizing Temperature** | 955 - 980°C (1750 - 1795°F) |
| **Quenching Medium** | Air (Still or Forced) |
| **Tempering Temperature** | 150 - 540°C (300 - 1000°F). Often tempered in the range of 205-425°C (400-800°F) to optimize the hardness-toughness balance. **Triple tempering is recommended.** |
| **Toughness** | Low to moderate; application must be designed to minimize tensile stress and impact. |
## **Product Applications**
Latrobe BR-3® is used in demanding wear applications where tool life on abrasive materials is the paramount concern.
* **Blanking and Punching Dies:** For extremely abrasive materials such as fiberglass, composites, sand-filled rubber, resins, hard plastics (e.g., phenolics), magnetic laminations, and abrasive sheet metals.
* **Forming Rolls and Mandrels:** Where severe abrasion is a factor.
* **Slitter Knives and Shear Blades:** For cutting abrasive non-metallic materials.
* **Wear Parts:** Liners, guides, and components subject to severe abrasive wear with minimal impact.
* **Brick and Ceramic Mold Liners.**
## **Processing & Heat Treatment Notes**
* **Machining:** Should be performed in the annealed condition. Due to its high hardness and carbide content, machinability is fair to poor; use positive rake angles, sharp tools, and moderate speeds/feeds.
* **Heat Treatment:** **Crucial preheating** (typically at 650-700°C / 1200-1300°F) is required before austenitizing to prevent cracking. Use a controlled atmosphere or vacuum furnace to prevent decarburization. Quench in still or forced air to below 65°C (150°F). **Immediate and multiple tempering cycles (2-3 times)** are essential to transform retained austenite, ensure dimensional stability, and develop optimal properties. Never use this steel in the as-quenched state.
* **Grinding:** Performs well in the hardened state. Use sharp wheels and proper coolant to avoid localized overheating and grinding checks.
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**Disclaimer**
*This product description provides typical information for A7 tool steel. Latrobe BR-3® may feature proprietary melting or processing for enhanced consistency. Its extremely high hardness and low toughness require careful application design and precise heat treatment. Properties are highly dependent on heat treatment parameters and section size. For critical applications, always consult the latest official technical data sheets and processing guidelines from Latrobe Specialty Steel to determine suitability and optimal processing parameters.*
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Latrobe BR-3® High Carbon-Medium Chromium Die Steel (AISI A7) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5350 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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Latrobe BR-3® High Carbon-Medium Chromium Die Steel (AISI A7) Properties
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Applications of Latrobe BR-3® High Carbon-Medium Chromium Die Steel Flange (AISI A7)
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Chemical Identifiers Latrobe BR-3® High Carbon-Medium Chromium Die Steel Flange (AISI A7)
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Packing of Latrobe BR-3® High Carbon-Medium Chromium Die Steel Flange (AISI A7)
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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 1821 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
