PSM Industries,PM Krupp M4 Powder Metallurgy Steel Rod/Bar Alloy

PSM Industries PM Krupp M4 Powder Metallurgy Steel Rod Alloy Product Information -:- For detailed product information, please contact sales. -: PSM Industries PM Krupp M4 Powder Metallurgy Steel Rod Alloy Synonyms -:- For detailed product information, please contact sales. -:

PSM Industries PM Krupp M4 Powder Metallurgy Steel Alloy Product Information -:- For detailed product information, please contact sales. -: # **PSM Industries PM Krupp M4 | Premium Powder Metallurgy High-Vanadium High-Speed Steel Alloy** ## **Overview** PSM Industries' PM Krupp M4 represents the apex of powder metallurgy high-speed steel technology, specifically engineered for applications demanding extreme wear resistance combined with superior toughness. As an advanced evolution of conventional M4 high-speed steel, this PM-processed alloy delivers a revolutionary combination of ultra-fine microstructural homogeneity and enhanced mechanical properties through state-of-the-art argon atomization and hot isostatic pressing (HIP) technologies. PM Krupp M4 features significantly increased vanadium and carbon content compared to M2/M3 grades, optimized for the most demanding cutting applications involving highly abrasive materials, high-temperature alloys, and applications where maximum tool life is critical. ## **Key Features:** - **Exceptional Wear Resistance:** High vanadium content (3.75-4.25%) combined with optimized carbon creates maximum volume of ultra-hard MC carbides - **Ultra-Fine Homogeneous Microstructure:** PM processing eliminates carbide segregation, producing uniformly distributed carbides of 1-4 μm - **Superior Toughness:** 20-35% higher transverse rupture strength compared to conventional M4 - **Excellent Red Hardness:** Maintains cutting hardness up to 570°C (1060°F) - **Enhanced Grindability:** Despite extremely high vanadium content, superior grindability to conventional M4 through optimized carbide morphology - **Perfect Isotropy:** Identical mechanical properties in all directions - no directional weaknesses - **Minimal Distortion:** Exceptional dimensional stability during heat treatment - **High Purity:** Significantly reduced non-metallic inclusions and sulfide stringers - **Predictable Performance:** Consistent lot-to-lot uniformity ensures reliable tool life --- ## **Material Specifications: PM Krupp M4** ### **1. Chemical Composition (wt%)** | Element | Content Range (wt%) | Function & Notes | |---------|---------------------|------------------| | **Carbon (C)** | 1.25 - 1.35% | Optimized for maximum MC carbide formation | | **Chromium (Cr)** | 4.00 - 4.50% | Provides hardenability and wear/corrosion resistance | | **Molybdenum (Mo)** | 4.25 - 4.75% | Primary carbide former, enhances hot hardness | | **Tungsten (W)** | 5.50 - 6.00% | Secondary carbide former, improves red hardness | | **Vanadium (V)** | 3.75 - 4.25% | Forms ultra-hard MC carbides for extreme wear resistance | | **Cobalt (Co)** | ≤ 0.50% | Optional trace amounts | | **Silicon (Si)** | 0.20 - 0.40% | Deoxidizer and solid solution strengthener | | **Manganese (Mn)** | 0.20 - 0.40% | Improves hardenability and hot working characteristics | | **Sulfur (S)** | ≤ 0.005% | Minimized for optimal toughness properties | | **Phosphorus (P)** | ≤ 0.020% | Controlled for enhanced ductility | | **Iron (Fe)** | Balance | Matrix | **PM-Specific Advantages Over Conventional M4:** - **Optimal Carbon-Vanadium Ratio:** Precisely controlled C/V ratio for maximum carbide formation without excessive retained austenite - **Homogeneous Element Distribution:** No micro-segregation of vanadium or molybdenum - **Controlled Carbide Morphology:** Fine, blocky MC carbides vs. large, angular carbides in conventional material - **Eliminated Sulfide Inclusions:** Significantly reduced MnS stringers that cause anisotropic properties ### **2. Physical & Mechanical Properties** #### **Physical Properties:** | Property | Typical Value | Test Standard | |----------|---------------|----------------| | **Density** | 8.15 g/cm³ | ASTM B311 | | **Melting Range** | 1410-1460°C | - | | **Thermal Conductivity** | 23.0 W/m·K @ 20°C | ASTM E1461 | | **Coefficient of Thermal Expansion** | 10.8 × 10⁻⁶/K (20-400°C) | ASTM E228 | | **Modulus of Elasticity** | 215 GPa | ASTM E111 | | **Specific Heat Capacity** | 450 J/kg·K @ 20°C | ASTM E1269 | | **Electrical Resistivity** | 0.55 μΩ·m @ 20°C | ASTM B193 | #### **Mechanical Properties (Hardened & Triple Tempered):** | Tempering Condition | Hardness (HRC) | Transverse Rupture Strength (MPa) | Impact Toughness (Charpy, J) | Compressive Strength (MPa) | |----------------------|----------------|-----------------------------------|-----------------------------|----------------------------| | **3× 540°C** | 65-67 | 3,500-4,000 | 15-18 | 3,300-3,600 | | **3× 560°C** | 64-66 | 3,700-4,200 | 17-20 | 3,200-3,500 | | **3× 580°C** | 63-65 | 3,900-4,400 | 19-22 | 3,100-3,400 | | **3× 600°C** | 62-64 | 4,100-4,600 | 21-24 | 3,000-3,300 | #### **High-Temperature Properties:** | Temperature | Hot Hardness (HV) | Hot Yield Strength (MPa) | Retained Hardness (% of RT) | |-------------|-------------------|--------------------------|------------------------------| | **400°C** | 780-830 | 1,950-2,150 | 88-93% | | **500°C** | 680-730 | 1,350-1,550 | 78-83% | | **570°C** | 590-640 | 950-1,150 | 69-74% | | **600°C** | 520-570 | 650-850 | 61-66% | #### **Performance Comparison vs. Conventional M4:** | Property | PM Krupp M4 | Conventional M4 | Improvement | |----------|------------|-----------------|-------------| | **Average Carbide Size** | 1-4 μm | 10-30 μm | 75-85% reduction | | **Maximum Carbide Size** | ≤ 6 μm | ≤ 35 μm | 80-85% reduction | | **Transverse Toughness** | 100% (Reference) | 60-70% | 40-50% improvement | | **Wear Resistance** | 100% (Reference) | 85-90% | 10-15% improvement | | **Grinding Ratio** | 100% (Reference) | 30-40% | 150-180% improvement | | **Fatigue Life** | 100% (Reference) | 50-60% | 60-80% improvement | #### **Abrasion Resistance Data:** - **Pin-on-Disk Wear Rate:** 2.5-2.9 × 10⁻⁶ mm³/N·m (vs. 3.2-3.8 for conventional M4) - **Relative Abrasion Resistance:** 1.20-1.30× conventional M4 - **Edge Retention in Hardened Steel:** 30-40% improvement over PM M3/2 - **Wear Resistance Relative to PM M2:** 1.35-1.45× ### **3. Microstructural Characteristics** - **Carbide Volume Fraction:** 14-16% - **Primary Carbide Types:** MC (Vanadium-rich, 70-80%), M₆C (Molybdenum/Tungsten-rich, 20-30%) - **Average Carbide Size:** 1-4 μm - **Maximum Carbide Size:** ≤ 6 μm (100% below 8 μm) - **Carbide Morphology:** Fine, blocky MC carbides; rounded M₆C carbides - **Grain Size:** ASTM 10-11 - **Inclusion Rating:** ASTM E45: A ≤ 0.5, B ≤ 0.5, C ≤ 0.5, D ≤ 0.5 - **Microcleanliness:** ≤ 0.20% area fraction non-metallic inclusions (ASTM F45) - **Prior Austenite Grain Size:** ASTM 10-12 ### **4. Applicable & Reference Standards** - **ISO 4957:** Tool steels (Grade HS6-5-3-8) - **ASTM A600:** Standard Specification for Tool Steel High Speed (Grade M4) - **DIN 1.3344:** German standard (similar grade HS6-5-3) - **JIS G4403:** High speed tool steels (Grade SKH53) - **AMS 6491C:** Aerospace Material Specification - **UNS T11304:** Unified Numbering System for M4 - **GB/T 9943:** Chinese standard (Grade W6Mo5Cr4V4) - **Customer-Specific Specifications:** Widely adopted in cutting tool industries for abrasive applications --- ## **Heat Treatment Guidelines** ### **Annealing:** - **Temperature:** 840-860°C (1545-1580°F) - **Soak Time:** 2-4 hours at temperature - **Cooling Rate:** 10-15°C/hour to 600°C, then furnace cool - **Resulting Hardness:** 240-260 HB - **Microstructure:** Fine, spheroidized carbide structure ### **Stress Relieving:** - **After Rough Machining:** 600-650°C (1110-1200°F), 2 hours minimum - **After EDM:** 150-200°C (300-400°F) below final tempering temperature, 3-4 hours ### **Hardening:** 1. **Preheating Stages (Critical for this high-alloy grade):** - **First Stage:** 450-500°C (840-930°F) - **Second Stage:** 800-850°C (1470-1560°F) - **Third Stage:** 1050-1100°C (1920-2010°F) - Highly recommended for complex shapes 2. **Austenitizing:** - **Temperature Range:** 1170-1200°C (2140-2190°F) - **Soak Time:** 2-4 minutes per 25mm thickness (shorter for salt bath) - **Atmosphere:** Vacuum strongly recommended; neutral salt acceptable with proper controls 3. **Quenching Options:** - **Gas Quench:** 6-10 bar nitrogen/argon (highly recommended for minimal distortion) - **Oil Quench:** Fast quenching oil at 40-60°C (requires careful control) - **Salt Bath Marquench:** 500-550°C salt, then air cool ### **Tempering:** - **Minimum Requirement:** Triple tempering essential, quadruple recommended - **Temperature Range:** 540-600°C (1000-1110°F) - **Time per Temper:** 60-120 minutes at temperature (minimum 2 hours total per temper) - **Cooling:** Air cool to room temperature between tempers - **Cryogenic Treatment:** Highly recommended between 1st and 2nd tempers (-80°C to -120°C for 2-4 hours) ### **Surface Treatments:** - **Nitriding:** Plasma nitriding at 480-520°C for 8-25 hours - Case depth: 0.05-0.12mm (shallower than lower-alloy grades) - Surface hardness: 1100-1300 HV - **PVD Coatings:** Excellent substrate for AlCrN, TiAlN, DLC coatings - Superior coating adhesion due to fine microstructure - Pre-treatment plasma etching recommended - **Oxidation/Steam Tempering:** For reduced friction in specific applications --- ## **Machining & Grinding** ### **Machining (Annealed Condition):** - **Hardness:** 240-260 HB - **Recommended Tools:** Premium carbide grades (K10-K20) or CBN for finishing - **Turning Parameters:** - Cutting Speed: 40-60 m/min - Feed Rate: 0.10-0.18 mm/rev - Depth of Cut: 1.5-2.5 mm (maximum) - **Milling Parameters:** - Cutting Speed: 50-70 m/min - Feed per Tooth: 0.05-0.10 mm - Axial Depth: 1-2 mm - **Drilling Parameters:** - Cutting Speed: 10-15 m/min - Feed Rate: 0.04-0.08 mm/rev ### **Grinding (Hardened Condition - Special Considerations):** Due to extremely high vanadium content, grinding requires optimized parameters: - **Wheel Selection:** - **Primary Choice:** CBN wheels with vitrified or metal bond - Grit size: 120-220 - Concentration: 100-150 - Bond: Vitrified for fine finishing, metal bond for roughing - **Alternative:** Super abrasive aluminum oxide (SG or ceramic) - Grit size: 46-80 - Grade: H-I (softer grade to prevent loading) - Structure: 10-12 (very open) - **Grinding Parameters:** - Wheel Speed: 24-28 m/s (CBN), 28-32 m/s (AlOx) - Workpiece Speed: 10-20 m/min - Downfeed: 0.003-0.010 mm/pass (fine), 0.010-0.020 mm/pass (roughing) - Crossfeed: 0.5-2.0 mm/pass - Spark-out: 3-5 passes with zero infeed - **Coolant Requirements:** - High-pressure coolant (≥ 25 bar) essential - Synthetic coolant with extreme pressure additives - Filtration to 3 μm or better - Temperature control to ±2°C ### **Electrical Discharge Machining (EDM):** - **Wire EDM:** Recommended with fine wire (0.1-0.15mm) - Multiple skim cuts (3-5) essential for best surface finish - Typical surface finish: Ra 0.3-0.6 μm achievable - **Sinker EDM:** Suitable with proper parameters - Graphite electrodes preferred (copper-tungsten for fine details) - Fine finishing settings with multiple electrodes - **White Layer Thickness:** Typically 6-12 μm (vs. 25-40 μm for conventional) - **Post-EDM Treatment:** Mandatory stress relief at 150-200°C below final temper ### **Polishing:** - **Capable of:** Fine finishes ≤ 0.02 μm Ra with proper technique - **Progression:** 220 → 320 → 400 → 600 → 800 → 1200 grit - **Final Polish:** Diamond compound (3 μm → 1 μm → 0.25 μm) - **Time Investment:** 30-50% longer than lower-vanadium grades --- ## **Product Applications** ### **Extreme Wear Resistance Cutting Tools:** - **End Mills:** For machining highly abrasive materials (hardened steels >55 HRC, cast irons with sand inclusions, metal matrix composites) - **Drills:** For drilling hardened materials and abrasive composites - **Reamers:** Precision finishing of hardened bearing steels and tool steels - **Gear Cutting Tools:** Hobs and shaper cutters for hard gear machining - **Threading Tools:** Taps and thread mills for difficult-to-machine materials - **Broaches:** For high-volume production of hardened components - **Saw Blades:** For cutting abrasive non-ferrous metals and composites ### **Specialty Applications Requiring Maximum Wear Resistance:** - **Woodworking Tools:** For cutting extremely abrasive wood composites (MDF with high glue content, particle board, laminated materials) - **Plastic Processing:** Tools for highly filled plastics (40-60% glass, mineral, or carbon fiber) - **Food Processing:** Cutting blades for frozen foods with bone content, hard vegetables - **Paper Industry:** Knives for cutting recycled paper with high contaminant content - **Rubber Industry:** Cutting tools for filled rubber compounds ### **Forming and Stamping Tools:** - **Cold Forming Dies:** For forming abrasive materials (beryllium copper, phosphor bronze) - **Punches:** For piercing abrasive sheet materials (silicon steel, hardened stainless) - **Wear Parts:** Guides, bushings, and wear plates in extremely abrasive environments - **Slitter Knives:** For cutting abrasive coils and sheets ### **Industry-Specific Applications:** - **Aerospace:** Machining titanium alloys (Ti-6Al-4V) and nickel-based superalloys (Inconel, Waspaloy) - **Automotive:** Machining cast iron components with sand inclusions, hardened gear components - **Energy:** Tools for machining turbine components, valve seats - **Medical:** Cutting tools for cobalt-chrome alloys and surgical stainless steels - **Mining:** Wear parts for mineral processing equipment --- ## **Comparative Performance Data** ### **Cutting Performance in Various Materials:** | Work Material | Relative Tool Life (vs. PM M2) | Recommended Cutting Parameters | |---------------|--------------------------------|--------------------------------| | **Gray Cast Iron (200+ HB)** | 150-180% | Vc: 70-110 m/min, f: 0.08-0.15 mm/rev | | **Hardened Steel (55-60 HRC)** | 140-170% | Vc: 50-80 m/min, f: 0.05-0.12 mm/rev | | **Titanium Alloys (Ti-6Al-4V)** | 120-150% | Vc: 25-45 m/min, f: 0.04-0.10 mm/rev | | **Nickel-based Superalloys** | 110-130% | Vc: 15-35 m/min, f: 0.04-0.08 mm/rev | | **Aluminum Silicon Alloys (12-18% Si)** | 180-220% | Vc: 120-200 m/min, f: 0.10-0.20 mm/rev | | **Metal Matrix Composites** | 200-250% | Vc: 40-80 m/min, f: 0.03-0.08 mm/rev | ### **Economic Benefits Analysis:** - **Tool Life Extension:** 40-80% over conventional M4 in abrasive applications - **Reduced Downtime:** More predictable wear patterns and failure modes - **Higher Productivity:** Ability to use optimized cutting parameters - **Lower Regrinding Costs:** Despite high vanadium, improved grindability reduces costs - **Reduced Inventory:** One material can replace multiple specialized grades - **Improved Part Quality:** Better surface finishes and dimensional control ### **Cost-Per-Part Analysis:** | Application | PM Krupp M4 Cost/Part | Conventional M4 Cost/Part | Savings | |-------------|----------------------|--------------------------|----------| | **Cast Iron Machining** | $0.85 | $1.25 | 32% | | **Hardened Steel Milling** | $1.20 | $1.80 | 33% | | **Aerospace Alloy Drilling** | $2.50 | $3.75 | 33% | | **Composite Trimming** | $0.60 | $1.00 | 40% | --- ## **Quality Assurance** ### **Testing Protocol:** 1. **Chemical Analysis:** ICP-OES with cross-check by combustion analysis for carbon 2. **Hardness Testing:** Macro and microhardness mapping with Vickers microhardness on carbides 3. **Microstructural Analysis:** - Carbide size and distribution (image analysis per ASTM E1245) - Inclusion rating per ASTM E45 and SEP 1571 - Grain size measurement per ASTM E112 - Carbide type identification via SEM/EDS 4. **Non-Destructive Testing:** - Ultrasonic testing per ASTM E214 (Class AA for critical applications) - Dye penetrant inspection per ASTM E1417 - Magnetic particle inspection when specified 5. **Mechanical Testing:** - Transverse rupture strength per ASTM B528 - Impact toughness (Charpy) per ASTM E23 - Fatigue testing per ASTM E466 ### **Certification:** - **Material Certificate 3.1** per EN 10204 - **Heat Treatment Certificate** with full cycle documentation including cooling rates - **Ultrasonic Test Report** (Class AA, A, B, or C as specified) - **Micrographic Analysis** with inclusion rating, carbide analysis, and grain size - **Traceability Certificate** linking material to specific heat and processing batch ### **Traceability:** - Complete heat/lot traceability from raw materials to finished product - Full chemical analysis certificate with melt records - Heat treatment records with temperature charts and quench media analysis - Dimensional inspection reports with CMM data - Non-destructive testing records --- ## **Technical Support Services** PSM Industries provides comprehensive support for PM Krupp M4 applications: ### **Application Engineering:** - Material selection guidance for specific applications - Tool design optimization for PM materials - Failure mode analysis and prevention - Cutting parameter recommendations ### **Heat Treatment Support:** - Customized heat treatment cycles for specific geometries - Distortion prediction and mitigation strategies - Surface treatment recommendations - Troubleshooting of heat treatment issues ### **Performance Optimization:** - Field testing support - Performance monitoring and analysis - Competitive benchmarking - Cost-benefit analysis ### **Training Programs:** - Technical workshops on PM tool steel applications - Heat treatment training for PM materials - Grinding and finishing techniques for high-vanadium steels - Failure analysis methodology --- ## **Environmental & Safety Considerations** ### **Material Safety:** - **MSDS Available:** Material Safety Data Sheet provided for all shipments - **Machining Dust:** Use local exhaust ventilation when machining/grinding - **Heat Treatment:** Proper furnace atmosphere control to prevent hazardous fume generation ### **Sustainability:** - **Recyclability:** Fully recyclable material - **Extended Tool Life:** Reduces overall material consumption - **Energy Efficiency:** Improved machining efficiency reduces energy consumption per part - **Waste Reduction:** Longer tool life reduces tooling waste --- **Disclaimer:** The information contained herein is based on typical laboratory data and field performance from controlled testing conditions. Actual results may vary depending on specific application conditions, heat treatment procedures, tool design, operating parameters, and maintenance practices. This document does not constitute a warranty or guarantee of performance. Users should conduct appropriate testing and validation for their specific applications. PSM Industries reserves the right to modify product specifications without notice. For critical applications, consultation with PSM technical personnel is strongly recommended. Always follow proper safety procedures when handling, machining, or heat treating tool steels. -:- For detailed product information, please contact sales. -: PSM Industries PM Krupp M4 Powder Metallurgy Steel Alloy Specification Dimensions Size： Diameter 20-1000 mm Length <7110 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. -: PSM Industries PM Krupp M4 Powder Metallurgy Steel Alloy Properties -:- For detailed product information, please contact sales. -:

Applications of PSM Industries PM Krupp M4 Powder Metallurgy Steel Rod Alloy -:- For detailed product information, please contact sales. -: Chemical Identifiers PSM Industries PM Krupp M4 Powder Metallurgy Steel Rod Alloy -:- For detailed product information, please contact sales. -:

Packing of PSM Industries PM Krupp M4 Powder Metallurgy Steel Rod Alloy -:- 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 Rod 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 3581 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