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 LSS™ A7 Mod. Wear-Resistant Tool Steel Flange (ASTM A7 Mod.) Product Information
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Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel Flange (ASTM A7 Mod.) Synonyms
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Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel (ASTM A7 Mod.) Product Information
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# **Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel (ASTM A7 Mod.)**
## **Product Overview**
Latrobe LSS™ A7 Mod. is a proprietary, modified variant of the classic AISI A7 air-hardening tool steel, engineered to push the boundaries of wear resistance while enhancing manufacturability and performance consistency. Building upon the foundational high-carbon, high-chromium chemistry of standard A7, this modified grade incorporates precise alloy adjustments and is produced under controlled conditions to deliver **exceptional abrasive wear resistance, improved dimensional stability, and more reliable heat treatment response**. It is designed for the most demanding applications where premature wear is the dominant failure mode, offering extended service life in severe abrasive environments.
## **Key Features & Benefits**
* **Superior Abrasive Wear Resistance:** Retains the very high volume of hard carbides characteristic of A7-type steels, providing outstanding resistance to wear when machining, forming, or cutting highly abrasive materials.
* **Enhanced Microstructural Uniformity:** Proprietary manufacturing controls promote a more uniform distribution of carbides, reducing the risk of localized brittleness and improving overall performance predictability.
* **Improved Dimensional Stability:** The air-hardening nature, combined with modified chemistry, results in minimal and predictable dimensional change during heat treatment, which is critical for maintaining precision in complex tooling.
* **Optimized Toughness-Balance:** While prioritizing wear resistance, the modification aims to provide a more consistent toughness profile compared to conventional A7, offering better resistance to chipping in carefully selected applications.
* **Good Grindability (in hardened state):** Despite its high hardness, the refined carbide structure allows for efficient and controllable grinding to achieve precise final tool geometries.
## **International Standard & Designifications**
* **Primary Reference Standard:** **ASTM A681-08 (R2019):** Standard Specification for Tool Steel Alloy.
* **Base Grade:** **A7 (Modified)** – This is a proprietary grade; exact specifications are defined by Latrobe Specialty Steel.
* **Manufacturer's Designation:** **Latrobe LSS™ A7 Mod.**
* **Unified Numbering System (UNS):** While standard A7 is T30107, this modified version may have proprietary specifications.
* **Common International Equivalents (Functional, not chemical):**
* This grade occupies a similar performance niche as other ultra-high wear-resistant cold work steels, such as **D7** or certain high-carbon, high-chromium modifications.
* **Germany (DIN/W-Nr.):** Functionally similar to grades like **~1.2377** or modified versions of **1.2365**.
## **Chemical Composition (%, typical - Proprietary Modified A7)**
The composition is a controlled enhancement of the standard A7 formula.
| Carbon (C) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) | Tungsten (W) | Manganese (Mn) | Silicon (Si) | Iron (Fe) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 2.10 - 2.40 | 5.00 - 6.00 | 0.70 - 1.40 | 0.60 - 1.10 | 0.50 - 1.50 | 0.20 - 0.50 | 0.20 - 0.50 | Balance |
*Note:* The precise balance and ranges of C, Cr, Mo, and V are optimized to maximize wear-resistant carbide formation while improving processing characteristics.
## **Physical & Mechanical Properties (Typical)**
| Property | Value / Description |
| :--- | :--- |
| **Density** | ~7.8 g/cm³ (0.282 lb/in³) |
| **Hardness (Annealed)** | 240-270 HB (Brinell) |
| **Hardness (Heat Treated)** | **65 - 68 HRC** (Typical optimal working range for maximum wear life) |
| **Austenitizing Temperature** | 970 - 1000°C (1775 - 1830°F) – Specific range provided by manufacturer data is critical. |
| **Quenching Medium** | Air (Still or Forced) |
| **Tempering Temperature** | 175 - 540°C (350 - 1000°F). Commonly double or triple tempered in the 205-425°C (400-800°F) range to achieve target hardness and ensure stability. |
| **Toughness** | Low to moderate; it is a wear-first material. Applications should be designed to minimize tensile stress and impact loading. |
## **Product Applications**
Latrobe LSS™ A7 Mod. is specified for tooling that requires the ultimate resistance to abrasive wear in cold work applications.
* **Precision Blanking and Punching Dies:** For highly abrasive materials such as advanced composites (carbon fiber, fiberglass), reinforced plastics, phenolic laminates, electrical steel (silicon steel), and abrasive pre-coated metals.
* **Forming Dies and Rolls:** For shaping abrasive materials where galling and wear are primary concerns.
* **Slitter Knives and Rotary Shear Blades:** For cutting abrasive non-metallic sheets, rubber, and specialty alloys.
* **Wear Parts and Liners:** In machinery processing abrasive powders, minerals, or ceramics.
* **Brick and Tile Mold Components.**
## **Processing & Heat Treatment Notes**
* **Machining:** Perform all heavy machining in the fully annealed condition. Use sharp, positive-rake cutting tools and moderate speeds/feeds due to the material's high hardness and abrasiveness in any state.
* **Heat Treatment:** **Essential preheating** (e.g., at 650°C/1200°F and 850°C/1560°F) is mandatory to minimize thermal stress. Austenitize in a controlled atmosphere or vacuum furnace. Quench in still or forced air. **Immediate and multiple tempering (2-3 cycles)** is absolutely required to transform retained austenite, develop full properties, and ensure dimensional stability. Never place the tool into service in the as-quenched condition.
* **Grinding:** Use sharp, friable grinding wheels (appropriate alumina or CBN) with ample coolant. The material's high hardness demands careful grinding practices to avoid thermal damage.
* **Surface Treatments:** Can be nitrided to further enhance surface hardness and wear resistance for specific applications.
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**Disclaimer**
*Latrobe LSS™ A7 Mod. is a proprietary tool steel. The information provided here is representative of modified A7-type steels for general description. The exact chemical composition, heat treatment parameters, and performance data are controlled by Latrobe Specialty Steel. It is the responsibility of the end-user to obtain and strictly follow the latest official technical data sheets and processing guidelines from Latrobe Specialty Steel for this specific grade. Proper application design and heat treatment are critical for safe and successful use.*
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Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel (ASTM A7 Mod.) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5351 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 LSS™ A7 Mod. Wear-Resistant Tool Steel (ASTM A7 Mod.) Properties
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Applications of Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel Flange (ASTM A7 Mod.)
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Chemical Identifiers Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel Flange (ASTM A7 Mod.)
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Packing of Latrobe LSS™ A7 Mod. Wear-Resistant Tool Steel Flange (ASTM A7 Mod.)
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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 1822 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
