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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Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Flange Product Information
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Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Flange Synonyms
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Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Product Information
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### **Böhler-Uddeholm COMPAX™ (AISI S7) MOLD QUALITY - Shock-Resisting Cold Work Tool Steel**
**Overview**
Böhler-Uddeholm COMPAX™ (AISI S7), produced under the stringent "MOLD QUALITY" standards, is an air-hardening, shock-resisting tool steel renowned for its exceptional combination of **high toughness, good wear resistance, and medium compressive strength**. It belongs to the S-group (Shock-resisting steels) and is specifically formulated to withstand severe impact and shock loading conditions without chipping or cracking. Supplied in the soft-annealed condition, it offers excellent machinability and dimensional stability during heat treatment, making it a premier choice for demanding cold work and molding applications where reliability is paramount.
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#### **1. Key Characteristics & Advantages**
* **Superior Toughness:** Outstanding resistance to chipping and cracking under high-impact conditions, surpassing many other cold work steels like D2 or A2.
* **Good Wear Resistance:** Provides a favorable balance between toughness and wear resistance, ensuring a long service life.
* **Air-Hardening:** Exhibits minimal distortion and size change during quenching, simplifying heat treatment and enabling the production of complex, precision tools.
* **Deep Hardening Penetration:** Excellent hardenability allows for full hardening of large cross-sections.
* **Good Machinability (in annealed state):** Offers superior machinability compared to high-carbon, high-chromium steels, reducing production time and cost.
* **"MOLD QUALITY" Standard:** Guarantees superior internal cleanliness (low sulfur content), uniform microstructure, and consistent isotropic properties—critical for mold applications to prevent texturing (orange peel effect) on polished surfaces and ensure predictable performance.
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#### **2. Typical Chemical Composition (Weight %)**
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Molybdenum (Mo) | Vanadium (V) |
| :--- | :---: | :---: | :---: | :---: | :---: | :---: |
| **Content** | 0.45 - 0.55 | 0.20 - 0.80 | 0.20 - 0.80 | 3.00 - 3.50 | 1.30 - 1.80 | ≤ 0.35 |
*Note: This is the standard AISI S7 composition range. Exact values are controlled to meet Böhler-Uddeholm's premium specifications.*
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#### **3. Physical & Mechanical Properties**
* **Delivery Hardness (Annealed):** ~ 200 HBW (max)
* **Typical Hardening & Tempering:**
* **Austenitizing Temperature:** 925 - 955°C (1700 - 1750°F)
* **Quenching:** Air.
* **Tempering Temperature Range:** 175 - 540°C (350 - 1000°F)
* **Achievable Hardness:** Up to **58 - 60 HRC** when tempered at lower temperatures (e.g., 175-205°C), with high toughness. At higher tempering temperatures (~540°C), hardness is around 48-50 HRC with increased ductility.
* **Density:** ~7.8 g/cm³
* **Thermal Conductivity:** ~ 36 W/(m·K) at 20°C
* **Modulus of Elasticity:** ~ 205 GPa
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#### **4. Main Applications**
COMPAX™ S7 is ideally suited for applications requiring a critical balance of toughness and wear resistance:
* **Cold Work Tooling:**
* Punching, blanking, and trimming dies for high-strength materials.
* Forming dies, shear blades, and slitters.
* Cold extrusion tools for non-ferrous metals.
* Heavy-duty riveting tools and chisels.
* **Molding Applications (Benefiting from "MOLD QUALITY"):**
* Plastic injection molds for abrasive or reinforced plastics (e.g., fiberglass).
* Core and cavity inserts for high-wear areas.
* Die-casting dies for aluminum and zinc (particularly ejector pins, cores).
* **Other Applications:**
* Knives for cutting tough materials (e.g., asbestos, rubber).
* Jackhammer parts and other impact tools.
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#### **5. Relevant International Standards & Comparable Grades**
Böhler-Uddeholm COMPAX™ is the proprietary brand name for their premium-grade AISI S7 steel.
| Standard | Grade / Designation | Similarity / Note |
| :--- | :--- | :--- |
| **AISI / ASTM A681** | **S7** | Direct equivalent in composition. COMPAX™ represents the premium quality tier. |
| **UNS** | **T41907** | Unified Numbering System equivalent. |
| **DIN / Werkstoff Nr.** | **1.3355** | Common European designation. |
| **JIS G4404** | **SKS?** | Japan does not have a direct S7 equivalent; SKS 3, 4, or 41 may be suggested for similar applications but differ in composition. |
| **ISO 4957** | **55NiCrMoV7** | The ISO standard shock-resisting grade, though composition differs slightly. |
**Important Distinction:** While "S7" is a generic standard, **Böhler-Uddeholm COMPAX™ supplied in MOLD QUALITY** signifies a superior material with guaranteed cleanliness, homogeneity, and polishability essential for critical tooling applications.
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#### **6. Supply Form & Processing**
* **Available Forms:** Precision ground flat stock, blocks, rounds, and custom forgings.
* **Machining:** Excellent machinability in the soft-annealed condition. Use standard tool steels machining practices.
* **Heat Treatment:** Air hardening is standard. Precise control of austenitizing temperature and time is crucial. Stress relieving after rough machining is recommended. It can be surface hardened via nitriding for extreme wear resistance on tough cores.
* **Grinding & Polishing:** The "MOLD QUALITY" ensures a homogeneous structure, allowing for an exceptional polish (mirror finish) and reliable EDM (Electrical Discharge Machining) performance.
**Conclusion**
Böhler-Uddeholm COMPAX™ (AISI S7) MOLD QUALITY is the definitive choice for engineers and toolmakers who cannot compromise on tool integrity under impact. Its unparalleled toughness, coupled with reliable wear resistance and the dimensional stability of air hardening, makes it an essential material for the most demanding cold work and precision molding tasks. The "MOLD QUALITY" guarantee ensures performance predictability and superior surface finish capabilities.
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Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Specification
Dimensions
Size：
Diameter 20-1000 mm Length <6872 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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Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Properties
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Applications of Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Flange
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Chemical Identifiers Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Flange
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Packing of Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Flange
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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 3343 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
