AISI 4419H Steel Foil/Strip

AISI 4419H Steel Foil, annealed at 915°C (1675°F), 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 4419H Steel Foil, annealed at 915°C (1675°F), 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 4419H Steel, annealed at 915°C (1675°F), 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: # **Technical Data Sheet: AISI 4419H Steel - Annealed Condition** ## **Product Overview** **Material Designation:** AISI 4419H Alloy Steel (Hardenability Controlled) **Heat Treatment Condition:** Annealed at 915°C (1675°F) **Product Form:** 25 mm (1 inch) Diameter Round Bar **Surface Condition:** Clean, scale-free, ready for machining **Primary Use:** Master heat for hardenability testing, machined components requiring uniform structure, and manufacturing blanks for subsequent heat treatment --- ## **1. Chemical Composition - Hardenability Controlled** ### **Guaranteed Composition Ranges** (Weight %) | Element | Minimum | Maximum | Typical | Hardenability Contribution | |---------|---------|---------|---------|----------------------------| | **Carbon (C)** | 0.17 | 0.23 | 0.19-0.21 | Primary strength determinant | | **Manganese (Mn)** | 0.45 | 0.70 | 0.50-0.65 | Major hardenability element | | **Silicon (Si)** | 0.15 | 0.35 | 0.20-0.30 | Deoxidation, solid solution strengthening | | **Chromium (Cr)** | 0.85 | 1.20 | 0.95-1.10 | Significant hardenability enhancement | | **Molybdenum (Mo)** | 0.20 | 0.35 | 0.23-0.30 | Secondary hardening, temper resistance | | **Nickel (Ni)** | 0.40 | 0.70 | 0.50-0.65 | Toughness improvement, hardenability | | **Phosphorus (P)** | — | 0.035 | ≤0.020 | Impurity control | | **Sulfur (S)** | — | 0.040 | ≤0.025 | Machinability enhancement | | **Iron (Fe)** | Balance | | | Matrix | ### **Hardenability Characteristics (4419H Specific)** - **Hardenability Band:** Guaranteed within specified Jominy curve limits - **Ideal Critical Diameter (D₁):** 100-140 mm (4-5.5 inches) in oil quench - **Jominy Distance to 50 HRC:** J12-J18 typical - **End Quench Hardenability Curve:** Certified and provided with material - **Hardenability Factor (HF):** 4.5-5.5 --- ## **2. Annealing Process** ### **Full Annealing Cycle** **Process Parameters:** - **Temperature:** 915°C ±10°C (1675°F ±18°F) - **Soak Time:** 2 hours minimum (1 hour per 25 mm of section) - **Atmosphere:** Protective (endothermic gas or neutral) to prevent decarburization - **Cooling Rate:** Controlled furnace cooling at 15-25°C/hour (27-45°F/hour) to 600°C (1112°F) - **Final Cooling:** Air cool to ambient temperature ### **Resulting Microstructure** - **Primary Phase:** Ferrite + Spheroidized Carbides - **Carbide Morphology:** Well-spheroidized, uniform distribution - **Grain Size:** ASTM 7-9 (10-20 μm) - **Hardness:** 170-210 HBW (optimal for machining) - **Decarburization Depth:** <0.1 mm total --- ## **3. Mechanical Properties (Annealed Condition)** ### **Room Temperature Properties** | Property | Minimum | Typical Range | Maximum | Test Standard | |----------|---------|---------------|---------|---------------| | **Hardness (Brinell)** | 170 HBW | 180-200 HBW | 210 HBW | ASTM E10 | | **Ultimate Tensile Strength** | 550 MPa | 580-650 MPa | 680 MPa | ASTM A370 | | **Yield Strength (0.2% Offset)** | 350 MPa | 380-450 MPa | 480 MPa | ASTM A370 | | **Elongation (in 4D)** | 20% | 22-28% | 30% | ASTM A370 | | **Reduction of Area** | 50% | 55-65% | 70% | ASTM A370 | | **Impact Energy (Charpy V, 20°C)** | 40 J | 45-60 J | 70 J | ASTM E23 | ### **Machinability Characteristics** - **Relative Machinability Rating:** 65% (compared to 100% for AISI 12L14) - **Recommended Cutting Speeds:** 70-100 m/min for turning with carbide tools - **Chip Formation:** Good, continuous chips with proper tool geometry - **Tool Life:** Good with appropriate cutting parameters ### **Forming & Fabrication Properties** - **Cold Formability:** Good (for annealed condition) - **Weldability:** Good with proper procedures (pre-heat 150-200°C recommended) - **Forging Temperature Range:** 1150-900°C (2100-1650°F) - **Hot Working:** Excellent within recommended temperature range --- ## **4. Physical Properties** | Property | Condition | Value | Unit | |----------|-----------|-------|------| | **Density** | 20°C | 7.85 | g/cm³ | | **Thermal Conductivity** | 20°C | 42.0 | W/m·K | | | 200°C | 40.5 | W/m·K | | **Specific Heat Capacity** | 20°C | 460 | J/kg·K | | **Mean CTE** | 20-100°C | 11.5 | ×10⁻⁶/K | | | 20-300°C | 12.0 | ×10⁻⁶/K | | **Electrical Resistivity** | 20°C | 0.22 | μΩ·m | | **Modulus of Elasticity** | 20°C | 205 | GPa | | **Magnetic Properties** | Annealed | Ferromagnetic | — | --- ## **5. International Standards Compliance** ### **Material Standards** - **AISI/SAE:** 4419H (Hardenability Controlled) - **UNS:** H44190 - **ASTM:** A304 (Standard for Alloy Steel Bars Subject to End-Quench Hardenability Requirements) - **ASTM:** A322 Grade 4419H - **ISO:** 683-18:2023 (41CrMo4+NiH) - **DIN/EN:** 1.6565 / 41CrMo4+Ni (with hardenability certification) - **JIS:** G4105 SCM 4H (Similar with hardenability control) ### **Testing Standards Applied** - **Chemical Analysis:** ASTM E415, ISO 4948 - **Hardenability Testing:** ASTM A255, ISO 642 - **Tensile Testing:** ASTM A370, ISO 6892-1 - **Hardness Testing:** ASTM E10, ISO 6506 --- ## **6. Hardenability Data (Certified)** ### **Jominy End-Quench Test Results** | Distance from Quenched End (1/16") | Hardness (HRC) Minimum | Hardness (HRC) Maximum | Typical | |-----------------------------------|------------------------|------------------------|---------| | **J1 (1.6 mm)** | 45 | 52 | 48-50 | | **J4 (6.4 mm)** | 42 | 49 | 44-46 | | **J8 (12.7 mm)** | 38 | 45 | 40-42 | | **J12 (19.0 mm)** | 34 | 41 | 36-38 | | **J16 (25.4 mm)** | 31 | 38 | 33-35 | | **J20 (31.8 mm)** | 28 | 35 | 30-32 | | **J24 (38.1 mm)** | 26 | 33 | 28-30 | ### **Hardenability Interpretation for 25 mm Round** - **Expected Surface Hardness after Quench:** 45-50 HRC - **Expected Core Hardness after Quench:** 40-45 HRC - **Quenching Medium Recommendation:** Oil quench preferred - **Severity of Quench (H-value):** 0.35-0.45 recommended --- ## **7. Applications** ### **Primary Application Areas** **1. Hardenability Reference & Testing Material** - **Master Heat for Quality Control:** Reference material for hardenability verification - **Heat Treatment Development:** Process optimization and furnace qualification - **Material Certification:** Reference samples for customer qualification - **Research & Development:** Material behavior studies **2. Precision Machined Components (To be Heat Treated)** - **Gear Blanks:** Automotive, industrial, and aerospace gear manufacturing - **Shaft Components:** Drive shafts, axle shafts, transmission shafts - **Bearing Components:** Races, rollers, bearing housings - **Fastener Blanks:** High-strength bolts, studs, special fasteners **3. Tooling & Die Applications** - **Mold Bases:** Plastic injection molds, die casting molds - **Fixture Components:** Jigs, fixtures, machine tool elements - **Die Components:** Forming dies, stamping dies (to be hardened) - **Cutting Tool Blanks:** Tool holders, arbors, special cutters **4. Automotive & Transportation** - **Transmission Components:** Gears, synchronizers, shafts - **Drivetrain Parts:** Differential components, universal joints - **Suspension Components:** Control arms, steering components - **Engine Parts:** Camshafts, crankshafts (forging blanks) **5. General Engineering** - **Heavy Machinery:** Construction equipment components - **Agricultural Equipment:** Gear boxes, drive components - **Material Handling:** Conveyor components, drive systems - **Hydraulic Components:** Pump bodies, valve bodies ### **Specific Advantages for 25 mm Section** - **Uniform Machinability:** Consistent hardness throughout cross-section - **Predictable Response:** Guaranteed hardenability for reliable heat treatment results - **Cost-Effective Processing:** Optimal condition for complex machining operations - **Quality Assurance:** Certified hardenability ensures consistent final properties --- ## **8. Machining Guidelines** ### **Turning Operations** - **Tool Material:** Carbide inserts (ISO P20-P30 grade) - **Cutting Speed:** 70-120 m/min - **Feed Rate:** 0.15-0.30 mm/rev - **Depth of Cut:** 2-5 mm (roughing), 0.5-1.5 mm (finishing) - **Coolant:** Soluble oil or emulsion recommended ### **Milling Operations** - **Cutter Type:** Carbide end mills or face mills - **Cutting Speed:** 60-110 m/min - **Feed per Tooth:** 0.08-0.18 mm - **Axial Depth:** Up to 1.5× cutter diameter - **Radial Depth:** 0.3-0.6× cutter diameter ### **Drilling & Tapping** - **Drill Type:** HSS or carbide-tipped drills - **Cutting Speed:** 15-30 m/min - **Feed Rate:** 0.10-0.25 mm/rev - **Peck Drilling:** Recommended for holes >3× diameter - **Tapping:** HSS taps with adequate lubrication ### **Special Considerations** - **Chip Control:** Use chip breakers for optimal chip formation - **Surface Finish:** Ra 1.6-3.2 μm readily achievable - **Dimensional Stability:** Good for precision machining - **Tool Wear:** Moderate, predictable tool life --- ## **9. Heat Treatment Recommendations** ### **Subsequent Heat Treatment Options** **Option 1: Carburizing (Case Hardening)** - **Process:** Gas carburizing at 925-950°C - **Case Depth:** 0.5-2.0 mm typical - **Core Properties:** Maintain toughness while achieving hard case - **Applications:** Gears, bearings, wear components **Option 2: Through Hardening** - **Austenitizing:** 850-870°C - **Quenching:** Oil quench recommended - **Tempering:** 150-600°C depending on required properties - **Applications:** Shafts, fasteners, structural components **Option 3: Induction Hardening** - **Frequency:** Medium to high frequency - **Case Depth:** 1-5 mm typical - **Advantages:** Localized hardening, minimal distortion - **Applications:** Bearing surfaces, wear areas ### **Annealed Condition Benefits for Heat Treatment** - **Uniform Response:** Consistent transformation behavior - **Minimal Distortion:** Reduced stresses minimize warpage - **Predictable Growth:** Known dimensional changes - **Optimal Microstructure:** Ideal starting condition for hardening --- ## **10. Quality Assurance** ### **Certification Requirements** - **Hardenability Certificate:** Complete Jominy curve data - **Chemical Analysis:** Full spectrographic analysis - **Mechanical Properties:** Tensile and hardness data - **Traceability:** Complete heat history and identification ### **Testing Protocol** 1. **Hardenability Testing:** Jominy end-quench test per ASTM A255 2. **Chemical Analysis:** Ladle and product analysis 3. **Mechanical Testing:** Tensile and hardness verification 4. **Microstructural Examination:** Grain size and structure evaluation ### **Dimensional Specifications** - **Diameter:** 25.0 mm ±0.1 mm - **Straightness:** 0.5 mm per meter maximum - **Surface Finish:** As-annealed, scale-free - **Length Tolerance:** +10/-0 mm standard --- ## **11. Technical Advantages** ### **Hardenability Controlled Benefits** 1. **Consistent Performance:** Guaranteed hardenability within narrow bands 2. **Predictable Results:** Reliable heat treatment outcomes 3. **Reduced Variability:** Minimized property scatter in production 4. **Quality Assurance:** Certified performance for critical applications ### **Annealed Condition Advantages** 1. **Optimal Machinability:** Ideal hardness for efficient machining 2. **Uniform Structure:** Consistent properties throughout section 3. **Stress-Free Condition:** Minimal residual stresses 4. **Versatile Base Material:** Suitable for various subsequent treatments ### **25 mm Round Specific Benefits** 1. **Section Consistency:** Uniform properties across diameter 2. **Processing Efficiency:** Ideal size for many component applications 3. **Heat Treatment Predictability:** Well-characterized response 4. **Material Utilization:** Efficient use of material in manufacturing --- ## **12. Comparative Analysis** ### **vs. Standard 4419 (Non-H Controlled)** | Parameter | AISI 4419H | Standard 4419 | Advantage | |-----------|------------|---------------|-----------| | **Hardenability Control** | Guaranteed band | Normal ranges | Better consistency | | **Property Predictability** | High | Moderate | More reliable | | **Quality Certification** | Full hardenability cert | Standard cert | Enhanced assurance | | **Cost** | Slightly higher | Standard | Value for critical apps | ### **vs. Alternative Annealed Alloy Steels** | Material | Hardness (HBW) | Machinability | Hardenability | Best Application | |----------|---------------|--------------|--------------|------------------| | **AISI 4419H** | 180-200 | Good | Excellent | Critical components | | AISI 4140 Annealed | 190-210 | Good | Very Good | General purpose | | AISI 8620 Annealed | 170-190 | Very Good | Good | Carburizing applications | | AISI 4340 Annealed | 210-230 | Fair | Excellent | High strength needs | --- ## **13. Storage & Handling** ### **Storage Requirements** - **Environment:** Dry, temperature-controlled storage preferred - **Relative Humidity:** <60% recommended - **Packaging:** VCI paper wrapping or rust preventive coating - **Stacking:** Maximum 1.5 meters height with proper support - **Shelf Life:** 24 months with proper protection ### **Handling Precautions** - **Safety Equipment:** Standard workshop PPE - **Lifting:** Use appropriate equipment for weight (3.85 kg/m) - **Surface Protection:** Avoid damage to machined surfaces - **Identification:** Maintain heat number identification --- ## **14. Ordering Information** ### **Standard Specifications** - **Material:** AISI 4419H, Annealed at 915°C - **Diameter:** 25.0 mm ±0.1 mm - **Lengths:** 3000, 4000, 6000 mm standard - **Condition:** Annealed, descaled, inspected - **Certification:** Hardenability certificate included ### **Available Options** - Precision turning to specific dimensions - Cutting to exact lengths with deburring - Special testing and certification - Custom packaging requirements --- ## **15. Technical Support** ### **Services Available** 1. **Heat Treatment Consultation:** Optimal treatment recommendations 2. **Machining Support:** Parameter optimization 3. **Application Engineering:** Component design assistance 4. **Material Selection:** Comparative analysis with alternatives ### **Documentation Provided** - Material Test Certificate with hardenability data - Jominy end-quench curve - Chemical analysis report - Processing recommendations --- **Revision History:** - Revision 1.0: Initial Release - Revision 1.1: Enhanced hardenability data - Revision 1.2: Added comparative analysis **Disclaimer:** The information provided represents typical properties. Actual values may vary within specification limits. This material requires appropriate heat treatment for final applications. Users should verify suitability through testing. **Document:** TDS-4419H-ANN-25 **Revision:** 1.2 **Date:** October 2023 -:- For detailed product information, please contact sales. -: AISI 4419H Steel, annealed at 915°C (1675°F), 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5605 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. -: AISI 4419H Steel, annealed at 915°C (1675°F), 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4419H Steel Foil, annealed at 915°C (1675°F), 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4419H Steel Foil, annealed at 915°C (1675°F), 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 4419H Steel Foil/Strip, annealed at 915°C (1675°F), 25 mm (1 in.) round -:- 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 Foil/Strip 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 2076 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