Bohler-Uddeholm,COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube,Pipe

Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube Product Information -:- For detailed product information, please contact sales. -: Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube Synonyms -:- For detailed product information, please contact sales. -:

Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Product Information -:- For detailed product information, please contact sales. -: ### **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. --- #### **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. --- #### **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.* --- #### **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 --- #### **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. --- #### **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. --- #### **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. -:- For detailed product information, please contact sales. -: 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 -:- For detailed product information, please contact sales. -: Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Properties -:- For detailed product information, please contact sales. -:

Applications of Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube -:- For detailed product information, please contact sales. -: Chemical Identifiers Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube -:- For detailed product information, please contact sales. -:

Packing of Bohler-Uddeholm COMPAX™ AISI S7 MOLD QUALITY Cold Work Steel Tube -:- For detailed product information, please contact sales. -: Standard Packing: -:- For detailed product information, please contact sales. -: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and Steel Tube 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