JIS SKH58 Molybdenum High Speed Tool Steel Flange

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." -:- For detailed product information, please contact sales. -: JIS SKH58 Molybdenum High Speed Tool Steel Flange Product Information -:- For detailed product information, please contact sales. -: JIS SKH58 Molybdenum High Speed Tool Steel Flange Synonyms -:- For detailed product information, please contact sales. -:

JIS SKH58 Molybdenum High Speed Tool Steel Product Information -:- For detailed product information, please contact sales. -: # **JIS SKH58 Molybdenum High-Speed Tool Steel** **International Standard:** JIS G4403 (Japan Industrial Standard) - High-Speed Tool Steels --- ## **1. Overview** JIS SKH58 is a **premium high-vanadium, cobalt-bearing molybdenum-based high-speed steel** that represents a specialized balance of extreme wear resistance and good high-temperature performance. Characterized by its **exceptionally high vanadium content combined with substantial cobalt addition**, this grade is engineered for applications where abrasion is the primary wear mechanism, yet some degree of red hardness is still required. SKH58 occupies a unique position between ultra-high-wear-resistant grades like SKH53 (M3:2) and high-cobalt hot-hardness grades like SKH55 (M42), offering a distinct combination for specific machining challenges. --- ## **2. Chemical Composition (Typical Weight %)** | Element | Content (%) | | :------ | :---------- | | C | 1.25–1.40 | | Si | 0.15–0.45 | | Mn | 0.15–0.40 | | Cr | 3.80–4.50 | | Mo | 4.80–5.50 | | W | 5.90–6.70 | | V | 3.00–3.50 | | Co | 7.50–8.50 | | P (max) | 0.030 | | S (max) | 0.030 | **Balance:** Iron (Fe). **Key Characteristics:** SKH58 combines **very high vanadium (3.0-3.5%) with substantial cobalt (7.5-8.5%)**, creating a unique alloy that delivers both excellent abrasion resistance (from vanadium carbides) and improved red hardness (from cobalt). The carbon content is elevated to match the high vanadium content, ensuring adequate carbon for carbide formation without excessive free carbon. --- ## **3. Physical & Mechanical Properties** ### **Physical Properties** - **Density:** ~8.15 g/cm³ - **Thermal Conductivity:** **Good** – Enhanced by cobalt content (~26-29 W/m·K at 20°C), better than high-vanadium, low-cobalt grades - **Coefficient of Thermal Expansion:** ~11.3 ×10⁻⁶ /K (20–500°C) - **Specific Heat Capacity:** ~0.46 kJ/kg·K - **Magnetic Properties:** Ferromagnetic ### **Mechanical Properties (Heat-Treated)** - **Annealed Hardness:** ≤ 293 HB - **Hardened & Tempered Hardness:** **66–69 HRC** (can achieve 68-69 HRC with optimized treatment) - **Red Hardness:** **Very Good to Excellent** – Maintains hardness effectively up to ~620-640°C - **Hot Hardness at 600°C:** ~56-58 HRC (improved over standard high-V grades due to cobalt) - **Wear Resistance:** **Exceptional** – Among the highest for conventional HSS due to high vanadium carbide volume - **Transverse Rupture Strength:** 2,700–3,100 MPa - **Compressive Strength:** 3,500–4,000 MPa - **Toughness:** **Moderate** – Lower than low-vanadium grades but better than some ultra-high-V grades due to cobalt matrix strengthening --- ## **4. Heat Treatment Specifications** ### **1. Annealing** - **Temperature:** 850–900°C - **Process:** Heat uniformly, hold for 3–4 hours, furnace cool slowly (10–15°C/h) to 600°C, then air cool - **Resulting Hardness:** ≤ 293 HB - **Spheroidize Annealing:** Recommended to optimize carbide morphology ### **2. Stress Relieving** - **Temperature:** 600–650°C - **Hold Time:** 2 hours per 25mm thickness - **Purpose:** Particularly important due to high alloy content and potential for distortion ### **3. Hardening (Quenching)** - **Preheating:** **Critical multi-stage process:** - **First Preheat:** 450–550°C - **Second Preheat:** 800–850°C - **Austenitizing Temperature:** **1190–1220°C** (Upper range often used to dissolve vanadium carbides) - **Soaking Time:** 2–4 minutes per 25mm section (adequate time needed for carbide solutioning) - **Quenching Medium:** Oil quenching recommended; salt bath for complex tools ### **4. Tempering** - **Immediate Tempering Required:** Begin when tool reaches 50–80°C - **Temperature Range:** 540–580°C - **Cycle:** **Triple tempering strongly recommended** – Each cycle: 2 hours minimum, air cool completely - **Optimal Process:** Temper at 560–570°C three times - **Hardness Development:** Strong secondary hardening response; achieves 67–69 HRC ### **5. Sub-Zero Treatment** - **Recommended:** Treatment at -70 to -100°C between quenching and first temper - **Benefits:** Particularly effective for stabilizing dimensions in high-alloy tools --- ## **5. Key Features & Advantages** 1. **Extreme Wear/Abrasion Resistance:** The high vanadium content (3.0-3.5%) provides exceptional resistance to abrasive wear, superior to most conventional HSS grades 2. **Enhanced Red Hardness:** Cobalt addition (7.5-8.5%) improves high-temperature performance compared to non-cobalt high-vanadium grades 3. **Balanced Performance:** Offers a unique combination of wear resistance and hot hardness not found in standard grades 4. **Good High-Temperature Strength:** Maintains cutting edge integrity under combined thermal and abrasive conditions 5. **Optimized for Specific Applications:** Designed for materials that are both abrasive and generate significant cutting heat **Trade-offs:** - **High Cost:** Significant cobalt and vanadium content makes it expensive - **Reduced Toughness:** Not suitable for severe interrupted cuts - **Challenging Grindability:** Hard vanadium carbides make grinding more difficult - **Complex Heat Treatment:** Requires precise control to optimize properties --- ## **6. Typical Applications** SKH58 is designed for **specialized applications where both abrasion and heat are significant factors**. ### **Primary Cutting Tool Applications:** - **Machining Highly Abrasive Materials at Higher Speeds:** - Advanced composites (carbon fiber, glass fiber, aramid composites) - High-silicon aluminum alloys (16-22% Si) at elevated cutting speeds - Metal matrix composites (MMCs) - Abrasive plastics with fillers (glass-filled, mineral-filled polymers) - Hardened steels with abrasive inclusions - **Specific Tool Types:** - **End Mills for Composites:** Where both abrasion and heat from high spindle speeds are concerns - **Drills for Abrasive Materials:** Requiring extended tool life in production environments - **Routers and Trimmers:** For composite material machining - **Broaches:** For finishing abrasive components where dimensional stability is critical - **Gear Hobs:** For cutting abrasive materials or gears with abrasive coatings ### **Specialized Industrial Applications:** - **Aerospace Composite Manufacturing:** Machining CFRP, GFRP structural components - **Automotive:** Machining aluminum-silicon alloy engine blocks and components - **Electronics:** Machining abrasive composite enclosures and components - **Mold & Die:** For molds processing abrasive filled plastics ### **Wear Part Applications:** - **Specialized Wear Components:** Where both abrasion and moderate temperatures are factors - **Guides and Bushings:** In abrasive processing environments - **Punches and Dies:** For forming abrasive materials --- ## **7. International Standard Equivalents** | Standard | Grade Designation | Notes | | :--------------- | :------------------ | :----------------------------------------- | | **JIS** | SKH58 | Original specification (JIS G4403) | | **AISI/SAE (USA)**| Similar to M4+Co* | High-vanadium, cobalt-bearing variant | | **Custom/Proprietary** | Various | Similar high-V, high-Co grades from specialty producers | | **DIN (Germany)** | Special grades | Comparable high-performance HSS | | **GB (China)** | Special grades | Custom formulations for specific needs | **Note:** SKH58 does not have a direct, universally standardized equivalent. It represents a specialized Japanese industrial grade that combines features of both high-vanadium (for wear) and high-cobalt (for hot hardness) HSS types. --- ## **8. Machining & Fabrication Guidelines** ### **Machining (In Annealed State):** - **Challenging Machinability:** Hard carbides and relatively high annealed hardness - **Tooling:** **Carbide tools essential** – Use grades for hard, abrasive materials - **Parameters:** Moderate speeds, consistent feeds, ample coolant - **Work Hardening:** Minimize tool dwell to prevent work hardening ### **Grinding:** - **Critical Consideration:** Hard vanadium carbides present grinding challenges - **Wheel Selection:** - **Optimal:** Cubic Boron Nitride (CBN) wheels – most efficient - **Alternative:** Diamond wheels for certain operations - **Conventional:** Premium ceramic aluminum oxide wheels with soft grade - **Parameters:** Light infeeds, high wheel speeds, copious high-pressure coolant - **Wheel Dressing:** Frequent dressing essential for maintaining efficiency - **Thermal Management:** Critical to avoid thermal damage ### **Electrical Discharge Machining (EDM):** - **Effective Method:** Suitable for complex shapes - **Parameters:** Use multiple passes with fine finish settings - **Post-Processing:** **Mandatory** removal of white layer - **Stress Relief:** Low-temperature tempering recommended ### **Wire EDM:** - **Suitable:** For profile cutting of hardened stock - **Considerations:** May require optimized parameters for best results --- ## **9. Surface Treatment** SKH58 benefits significantly from advanced surface treatments: 1. **PVD Coatings:** - **Recommended:** TiAlN, AlCrN, TiSiN, AlTiN - **Benefits:** Enhanced surface hardness, thermal barrier, reduced friction - **Application:** After final polishing; typical thickness 2-4 μm 2. **CVD Coatings:** - **For Specific Needs:** TiCN-based multilayer systems - **Consideration:** Higher temperature process requires careful control 3. **Nitriding:** - **Process:** Plasma or gas nitriding at 480–520°C - **Case Depth:** 0.03–0.10 mm - **Surface Hardness:** 1200–1400 HV - **Caution:** Temperature control critical 4. **Surface Engineering:** - **Laser Texturing:** For improved chip control - **Micro-blasting:** For edge preparation --- ## **10. Performance Comparison** ### **Within High-Speed Steel Categories:** | Property | SKH58 | SKH53 (M3:2) | SKH55 (M42) | SKH56 | |-----------------------|--------------|--------------|--------------|--------------| | **Vanadium Content** | 3.0–3.5% | 2.4–2.8% | 1.0–1.25% | 3.5–4.25% | | **Cobalt Content** | 7.5–8.5% | <0.5% | 8.0–9.0% | 9.5–10.5% | | **Wear Resistance** | **Excellent** | Very Good | Good | **Best** | | **Red Hardness** | Very Good | Good | **Excellent** | Excellent | | **Toughness** | Moderate | Moderate | Low-Moderate | Low | | **Primary Strength** | Abrasion | Abrasion | Heat | Both | ### **Strategic Positioning:** - **Compared to SKH53 (M3:2):** Better high-temperature performance due to cobalt - **Compared to SKH55 (M42):** Better wear resistance due to higher vanadium - **Compared to SKH56:** More balanced between wear and heat resistance - **Unique Niche:** For applications needing both abrasion resistance and moderate hot hardness --- ## **11. Quality Control** ### **Material Certification:** - Full chemical analysis with emphasis on V, Co, C balance - Microcleanliness assessment - Carbide structure analysis ### **Heat Treatment Validation:** - Hardness uniformity testing - Microstructure examination - Dimensional stability verification ### **Non-Destructive Testing:** - Ultrasonic inspection - Magnetic particle inspection - Dimensional accuracy verification --- ## **12. Economic Considerations** ### **Cost Factors:** - **Raw Material:** High due to vanadium and cobalt content - **Processing:** Higher grinding and heat treatment costs - **Tool Life:** Extended life in appropriate applications - **Productivity:** Enables efficient machining of difficult materials ### **ROI Justification:** - When machining highly abrasive materials - When both abrasion and heat are limiting factors - For critical production operations - When alternative materials fail prematurely --- ## **13. Summary & Selection Guidelines** JIS SKH58 represents a **specialized high-performance HSS grade** that fills a specific niche between pure abrasion-resistant grades and pure hot-hardness grades. **Select SKH58 when:** 1. Machining **highly abrasive materials** that also generate significant heat 2. **Both flank wear and thermal softening** are observed as failure modes 3. **Higher cutting speeds** are desired on abrasive materials 4. **Existing high-V tools** fail due to thermal issues 5. **Existing high-Co tools** fail due to abrasive wear **Optimal Application Examples:** - High-speed routing of carbon fiber composites - Drilling high-silicon aluminum at elevated speeds - Machining metal matrix composites in production quantities - Operations where switching between different tool materials is impractical **Alternative Considerations:** - **For pure abrasion:** Consider SKH53 (M3:2) or higher V grades - **For pure hot hardness:** Consider SKH55 (M42) or higher Co grades - **For extreme both:** Consider SKH56 or powder metallurgy grades - **For cost-sensitive applications:** Consider whether SKH51 (M2) with coating might suffice **Strategic Value:** SKH58 provides a **balanced solution** for specific industrial challenges where both abrasion and heat resistance are required. While not as extreme in either property as specialized grades, its balanced approach makes it versatile for certain production environments. For manufacturers facing **combined abrasive and thermal challenges** in their machining operations, SKH58 offers a **technologically advanced solution** that can improve tool life, reduce changeover frequency, and increase overall productivity in appropriate applications. -:- For detailed product information, please contact sales. -: JIS SKH58 Molybdenum High Speed Tool Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6817 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. -: JIS SKH58 Molybdenum High Speed Tool Steel Properties -:- For detailed product information, please contact sales. -:

Applications of JIS SKH58 Molybdenum High Speed Tool Steel Flange -:- For detailed product information, please contact sales. -: Chemical Identifiers JIS SKH58 Molybdenum High Speed Tool Steel Flange -:- For detailed product information, please contact sales. -:

Packing of JIS SKH58 Molybdenum High Speed Tool Steel Flange -:- 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 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 3288 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