AISI 4626H Steel Foil/Strip

AISI 4626H Steel Foil Product Information -:- For detailed product information, please contact sales. -: AISI 4626H Steel Foil Synonyms -:- For detailed product information, please contact sales. -:

AISI 4626H Steel Product Information -:- For detailed product information, please contact sales. -: # **AISI 4626H Alloy Steel - Hardenability Controlled Specification** ## **Medium-High Carbon Nickel-Molybdenum Steel with Guaranteed Hardenability** --- ### **1. PRODUCT OVERVIEW** **AISI 4626H Alloy Steel - Hardenability Controlled** - **Material Classification:** Medium-high carbon nickel-molybdenum alloy steel with guaranteed hardenability - **H-Designation Significance:** Complies with hardenability requirements per SAE J1268/ASTM A304 - **Carbon Content:** 0.24-0.29% (optimized for through-hardening applications) - **Key Feature:** Controlled chemistry to ensure consistent hardenability within specified Jominy bands - **Primary Advantage:** Predictable heat treatment response across production lots and suppliers - **Typical Supply Condition:** Annealed or normalized for machining - **UNS Designation:** H46260 **Critical Distinction: 4626 vs. 4626H** | Aspect | AISI 4626 (Standard) | AISI 4626H (Hardenability Controlled) | |--------|---------------------|---------------------------------------| | **Quality Focus** | Chemical composition only | Chemical + hardenability performance | | **Consistency** | Variable between heats | Guaranteed within specified bands | | **Testing** | Chemical analysis only | Chemical + Jominy end-quench test | | **Application** | General engineering | Critical components requiring reliability | | **Cost** | Standard | 10-20% premium for guaranteed performance | --- ### **2. CHEMICAL COMPOSITION SPECIFICATION** #### **AISI 4626H Standard Composition Ranges:** | Element | AISI 4626H Range (%) | Typical Aim Composition (%) | Metallurgical Function & Control Importance | |---------|---------------------|-----------------------------|---------------------------------------------| | **Carbon (C)** | 0.24-0.29 | 0.26-0.28 | Primary hardenability control; adjusted to band center | | **Manganese (Mn)** | 0.60-0.80 | 0.70-0.75 | Major hardenability element; fine-tuned per heat | | **Silicon (Si)** | 0.15-0.30 | 0.20-0.25 | Secondary effect on hardenability; kept consistent | | **Nickel (Ni)** | 0.70-1.00 | 0.85-0.95 | Toughness provider; moderate hardenability contribution | | **Molybdenum (Mo)** | 0.15-0.25 | 0.20-0.22 | Grain refinement; prevents temper embrittlement | | **Phosphorus (P)** | ≤ 0.025 | ≤ 0.015 | Tighter control than standard grade | | **Sulfur (S)** | ≤ 0.025 | 0.015-0.020 | Tighter control; may be optimized for machinability | | **Chromium (Cr)** | Report | ≤ 0.20 | Residual; monitored for consistency | | **Copper (Cu)** | Report | ≤ 0.20 | Residual; monitored | | **Boron (B)** | Optional: 0.0005-0.003 | Optional | Significant hardenability enhancer (4626HB if specified) | #### **Hardenability Control Methodology:** 1. **Carbon-Manganese Balance:** Precisely controlled within narrow bands 2. **Residual Element Management:** Tighter limits on P, S, Cu, Cr 3. **Heat-to-Heat Adjustment:** Chemistry fine-tuned while staying within H-ranges 4. **Optional Boron Addition:** For enhanced hardenability in larger sections #### **Chemistry vs. Standard 4626:** - **Tighter Ranges:** P, S limits reduced from 0.035/0.040 to 0.025 - **Mandatory Reporting:** Cr, Cu must be reported (not required for standard) - **Aim Composition:** Centered within ranges for consistency --- ### **3. INTERNATIONAL STANDARDS & EQUIVALENTS** | Standard System | Designation | Title / Description | Hardenability Reference | |----------------|-------------|---------------------|--------------------------| | **UNS** | H46260 | Unified Numbering System | Includes hardenability requirement | | **SAE** | 4626H | SAE J1268 | Hardenability Bands for Hardenability Steels | | **ASTM** | A304 | Steel Bars, Alloy, Subject to End-Quench Hardenability | Primary specification | | **ASTM** | A29/A29M | Steel Bars, Carbon and Alloy | Includes H-grade requirements | | **AMS** | 6274H | Steel Bars, Forgings, and Tubing | Aerospace H-grade specification | | **ISO** | 683-11 | Heat-treatable steels | Includes H-designation requirements | | **DIN** | 1.6525H | 26NiCrMo2 H-güte | German H-grade equivalent | | **EN** | 1.6523H | 26NiCrMo2 H-grade | European H-designation | | **JIS** | - | No direct equivalent | Similar to controlled hardenability grades | #### **Hardenability Band System (SAE J1268):** - **Multiple Bands Available:** Typically Bands 1-4 for 4626H - **Band Selection Criteria:** Based on section size and required hardness - **Customer Specification:** Often includes specific band requirements --- ### **4. HARDENABILITY SPECIFICATION (JOMINY TEST)** #### **Standard Hardenability Bands for AISI 4626H:** | Distance from Quenched End | Band 1 (HRC) | Band 2 (HRC) | Band 3 (HRC) | Band 4 (HRC) | |----------------------------|--------------|--------------|--------------|--------------| | **1.5 mm (1/16")** | 42-50 | 45-52 | 48-55 | 51-57 | | **5 mm (3/16")** | 38-46 | 41-48 | 44-51 | 47-53 | | **10 mm (3/8")** | 34-42 | 37-44 | 40-47 | 43-49 | | **15 mm (5/8")** | 30-38 | 33-40 | 36-43 | 39-45 | | **20 mm (3/4")** | 28-36 | 31-38 | 34-41 | 37-43 | | **25 mm (1")** | 26-34 | 29-36 | 32-39 | 35-41 | #### **Typical Through-Hardening Capability:** | Bar Diameter | Oil Quench | Water Quench | Expected Center Hardness (HRC) | |--------------|------------|--------------|-------------------------------| | **25 mm (1")** | Band 2: 29-36 | Band 2: 31-38 | 90-95% of surface hardness | | **50 mm (2")** | Band 2: 25-32 | Band 2: 28-35 | 80-85% of surface hardness | | **75 mm (3")** | Band 2: 22-29 | Band 2: 25-32 | 70-75% of surface hardness | #### **Hardenability Factors (Grossmann):** - **Ideal Critical Diameter (Dᵢ):** 45-75mm depending on band - **Multiplicative Factors:** - Carbon factor: 0.25-0.30 (based on 0.26-0.28% C) - Mn factor: 3.5-4.0 (based on 0.70-0.75% Mn) - Ni factor: 1.3-1.5 (based on 0.85-0.95% Ni) - Mo factor: 1.8-2.0 (based on 0.20-0.22% Mo) --- ### **5. PHYSICAL PROPERTIES** | Property | Value | Conditions / Notes | |----------|-------|-------------------| | **Density** | 7.85 g/cm³ (0.284 lb/in³) | At 20°C | | **Melting Range** | 1480-1520°C | Consistent due to controlled chemistry | | **Thermal Conductivity** | 41.5 W/m·K | At 100°C, annealed condition | | **Specific Heat Capacity** | 460 J/kg·K | At 20°C | | **Coefficient of Thermal Expansion** | 12.1 × 10⁻⁶/K | 20-100°C; consistent heat-to-heat | | **Electrical Resistivity** | 0.24 μΩ·m | At 20°C | | **Modulus of Elasticity** | 205 GPa (29.7×10⁶ psi) | Predictable across all heats | | **Shear Modulus** | 80 GPa (11.6×10⁶ psi) | - | | **Poisson's Ratio** | 0.29 | - | | **Transformational Consistency** | High | Ms: 350±10°C, Mf: 200±10°C | **Austenite Transformation Temperatures (Typical):** - **Ac₁:** 730±5°C (1345±10°F) - **Ac₃:** 790±5°C (1455±10°F) - **Ms (Martensite Start):** 350±5°C (660±10°F) - **Mf (Martensite Finish):** 200±5°C (390±10°F) --- ### **6. MECHANICAL PROPERTIES (HEAT TREATED)** #### **Guaranteed Minimum Properties:** *845°C Austenitize, Oil Quench, 540°C Temper* | Property | Minimum Values | Typical Values | Consistency Range (±) | |----------|----------------|----------------|----------------------| | **Tensile Strength** | 900 MPa (130 ksi) | 950-1100 MPa | 5% maximum | | **Yield Strength (0.2%)** | 750 MPa (109 ksi) | 800-950 MPa | 5% maximum | | **Elongation in 4D** | 12% | 14-18% | 2 percentage points | | **Reduction of Area** | 35% | 40-50% | 5 percentage points | | **Hardness** | 28 HRC | 30-34 HRC | ±2 HRC | | **Charpy V-Notch Impact** | 25 J (18 ft-lb) | 30-40 J | ±5 J | #### **Property Consistency Across Production:** | Property | Heat-to-Heat Variation | Lot-to-Lot Variation | Primary Control Factor | |----------|------------------------|----------------------|------------------------| | **Hardness** | ±2 HRC | ±3 HRC | Carbon content & hardenability | | **Tensile Strength** | ±5% | ±7% | Carbon & microstructure | | **Yield Strength** | ±5% | ±7% | Carbon & microstructure | | **Impact Energy** | ±10% | ±15% | Nickel content & inclusion control | #### **Section Size Effect (Predictable due to H-grade):** | Section Size | Predicted Hardness (HRC) | Strength Reduction Factor | |--------------|--------------------------|---------------------------| | **≤25 mm** | 100% of Jominy surface value | 0% | | **25-50 mm** | 90-95% of surface value | 5-10% | | **50-75 mm** | 80-90% of surface value | 10-20% | | **75-100 mm** | 70-80% of surface value | 20-30% | --- ### **7. HEAT TREATMENT RESPONSE & CONTROL** #### **Standard Heat Treatment for 4626H:** 1. **Austenitizing:** - Temperature: 830-850°C (1525-1560°F) ±8°C - Soak Time: 30 min/inch minimum - Atmosphere Control: Essential for consistent results 2. **Quenching:** - Medium: Fast oil (ISO VG 46-68) - Agitation: Controlled for uniformity - Temperature: 40-60°C (104-140°F) 3. **Tempering:** - Temperature Range: 200-650°C (390-1200°F) - Time: 1-2 hours/inch minimum - Cooling: Still air #### **Predictability Advantages:** - **Hardness Prediction:** ±2 HRC accuracy from Jominy data - **Case Depth Calculation:** Reliable for induction/case hardening - **Distortion Control:** More predictable transformation strains - **Residual Stress:** Consistent patterns for machining allowance #### **Critical Control Parameters:** | Parameter | Standard 4626 Tolerance | 4626H Recommended Tolerance | Reason | |-----------|-------------------------|-----------------------------|--------| | **Austenitizing Temp** | ±15°C | ±8°C | Consistent hardenability | | **Soak Time** | Variable | ±10% | Complete transformation | | **Quench Rate** | Variable | Controlled within ±10% | Predictable microstructure | | **Tempering Temp** | ±15°C | ±5°C | Consistent final properties | --- ### **8. TYPICAL APPLICATIONS** #### **Applications Requiring H-Grade Consistency:** 1. **Automotive Powertrain Components:** - Transmission gears and shafts - Differential gears and pinions - Driveshaft components - *Requirement:* Consistent hardness for uniform wear and noise control 2. **Heavy Equipment & Off-Highway:** - Track links and pins - Gearbox components - Hydraulic cylinder rods - *Requirement:* Predictable hardening in thick sections 3. **Industrial Gearing:** - Large gear sets - High-torque gearbox components - Crane and hoist gears - *Requirement:* Uniform properties across gear teeth 4. **Oil & Gas Equipment:** - Valve stems and gates - Pump shafts - Drill string components - *Requirement:* Reliability in remote service locations 5. **Agricultural Machinery:** - PTO shafts - Gearbox components - Harvesting equipment parts - *Requirement:* Consistent performance across production batches #### **Economic Justification for 4626H:** | Cost Factor | Standard 4626 | 4626H | Savings with 4626H | |-------------|---------------|-------|--------------------| | **Heat Treatment Scrap** | 3-5% typical | 1-2% | 2-3% reduction | | **Inspection Cost** | 100% testing | Statistical sampling | 40-60% reduction | | **Warranty Claims** | Higher variability | Lower and predictable | 1-2% of part cost | | **Assembly Issues** | Occasional fit problems | Consistent dimensions | Reduced rework | --- ### **9. PROCESSING CHARACTERISTICS** #### **Machinability (Annealed Condition):** - **Relative Rating:** 55-60% of B1112 steel - **Consistency Advantage:** Uniform tool wear across material lots - **Recommended Parameters:** - Cutting speed: 35-50 m/min (HSS), 80-120 m/min (carbide) - Feed rate: 0.15-0.25 mm/rev - Depth of cut: 2-5 mm for roughing - **Tool Life Predictability:** ±15% variation vs ±30% for standard grade #### **Forging and Hot Working:** - **Temperature Range:** 1150-900°C (2100-1650°F) - **Consistency:** More predictable flow stresses - **Scale Formation:** Consistent due to controlled Si content - **Post-forging Annealing:** Recommended for machinability #### **Welding Considerations:** - **Weldability Rating:** Fair (similar to standard 4626) - **Consistency Advantage:** Predictable HAZ hardness - **Recommended Procedures:** - Preheat: 150-200°C - Interpass: 150-250°C - Post-weld heat treatment: 590-650°C stress relief - **Filler Material:** AWS ER80S-D2 or equivalent --- ### **10. QUALITY ASSURANCE & TESTING** #### **Mandatory Testing for 4626H:** 1. **Chemical Analysis:** Complete spectrographic analysis per heat 2. **Jominy End-Quench Test:** Per ASTM A255 on each heat 3. **Hardness Verification:** Brinell or Rockwell on annealed material 4. **Certification:** Hardenability curve with material #### **Additional Testing (as specified):** - **Microcleanliness:** ASTM E45, Method D - **Grain Size:** ASTM E112 (typically 6-8) - **Macroetch:** ASTM E381 for soundness - **Ultrasonic Testing:** For critical applications #### **Acceptance Criteria:** | Test | Requirement | Frequency | Documentation | |------|-------------|-----------|---------------| | **Chemistry** | Within H-grade ranges | Each heat | Certificate 3.1 | | **Jominy Test** | Within specified band | Each heat | Curve provided | | **Surface Quality** | No defects per spec | 100% | Visual report | | **Dimensions** | Per ASTM A29 | Each bundle | Inspection report | #### **Traceability Requirements:** - Complete heat history maintained - Jominy test results linked to heat number - Processing records for certified applications - Material identification maintained through processing --- ### **11. DESIGN ADVANTAGES OF H-GRADES** #### **Engineering Design Benefits:** 1. **Reduced Safety Factors:** More reliable material properties 2. **Accurate FEA Modeling:** Consistent material data inputs 3. **Predictable Fatigue Life:** More reliable S-N curve data 4. **Optimized Sections:** Can design to material capabilities #### **Manufacturing Benefits:** 1. **Consistent Machining:** Uniform cutting forces and tool wear 2. **Reduced Heat Treatment Adjustments:** Fewer parameter changes 3. **Lower Inspection Frequency:** Statistical process control effective 4. **Improved Supplier Management:** Multiple sources provide equivalent material #### **Quality Benefits:** 1. **Reduced Scrap:** Fewer heat treatment failures 2. **Lower Rework:** Consistent dimensional changes 3. **Improved Traceability:** Complete material history 4. **Certification Support:** Meets aerospace/automotive requirements --- ### **12. COMPARISON WITH OTHER H-GRADES** | H-Grade | Carbon Range | Ni% Range | Typical Band | Cost Index | Best Application | |---------|--------------|-----------|--------------|------------|------------------| | **4626H** | 0.24-0.29 | 0.70-1.00 | Band 2-3 | 100 | General engineering, gears | | **4620H** | 0.17-0.22 | 1.65-2.00 | Band 2-3 | 120 | High-toughness applications | | **4140H** | 0.38-0.43 | - | Band 2-3 | 90 | High strength, low toughness | | **4340H** | 0.38-0.43 | 1.65-2.00 | Band 3-4 | 140 | Ultra-high strength | | **1045H** | 0.43-0.50 | - | Band 1-2 | 70 | General purpose, low cost | #### **Selection Matrix:** | Requirement | Recommended Grade | Reason | |-------------|------------------|--------| | **Cost-sensitive + good properties** | 4626H | Optimal balance | | **Maximum toughness** | 4620H | Higher nickel | | **Maximum strength** | 4340H | Higher carbon + nickel | | **Minimum cost** | 1045H | Plain carbon | | **Wear resistance focus** | 4626H | Higher carbon than 4620H | --- ### **13. TECHNICAL SPECIFICATION RECOMMENDATIONS** #### **Procurement Specification Example:** ``` MATERIAL: AISI 4626H Alloy Steel SPECIFICATION: ASTM A304, SAE J1268 Band 2 CONDITION: Annealed, 170-207 HB CHEMISTRY: Per SAE J404 with P≤0.020%, S≤0.020% HARDENABILITY: Jominy curve to be supplied with certification TESTING: Each heat to be Jominy tested CERTIFICATION: EN 10204 3.1 certificate with hardenability curve ADDITIONAL: Grain size ASTM 6-8, inclusion rating per ASTM E45 Method A ``` #### **Quality Documentation Required:** - Material Test Certificate 3.1 (EN 10204) - Jominy hardenability curve - Chemical analysis report (including residuals) - Heat treatment recommendations - Optional: Microcleanliness report, grain size report #### **Supplier Qualification Requirements:** - QS/ISO 9001 certification - Capability to perform Jominy testing - Statistical process control for chemistry - Traceability system in place --- ### **14. GLOBAL SUPPLY CHAIN CONSIDERATIONS** #### **Production Sources:** - **North America:** Major integrated mills and specialty producers - **Europe:** Available as 1.6525H from EU producers - **Asia:** Limited production; often supplied as equivalent grades #### **Lead Time Factors:** - **Stock Material:** 1-2 weeks for common sizes/conditions - **Mill Production:** 8-12 weeks including testing - **Testing Time:** 1-2 weeks for full certification - **Import Considerations:** Additional 2-4 weeks for non-local supply #### **Cost Structure:** | Cost Component | Percentage of Total | Notes | |----------------|---------------------|-------| | **Base Material** | 60-70% | Higher than standard grade | | **Testing & Certification** | 10-15% | Jominy test adds cost | | **Premium for H-grade** | 15-20% | For guaranteed consistency | | **Total Premium vs Standard** | 25-35% | Justified by reduced processing costs | --- **TECHNICAL SUMMARY:** AISI 4626H provides a controlled hardenability version of medium-high carbon nickel-molybdenum steel, offering predictable heat treatment response and consistent mechanical properties. The H-grade designation ensures reliable performance in critical applications where component consistency is essential for assembly, performance, and reliability. **PRIMARY VALUE PROPOSITION:** 1. **Predictability:** Accurate hardness and property prediction 2. **Consistency:** Reduced variation in manufactured components 3. **Reliability:** Improved component performance and life 4. **Cost Effectiveness:** Overall lower total cost despite material premium **APPLICATION GUIDELINES:** Specify AISI 4626H when: - Multiple production lots must be interchangeable - Heat treatment consistency is critical to function - Component reliability affects system performance - Total cost (material + processing + quality) is optimized --- **QUALITY COMMITMENT:** AISI 4626H is produced under stringent controls with mandatory Jominy testing to ensure hardenability compliance. Each heat is fully traceable and certified, providing the reliability needed for critical applications in automotive, aerospace, and industrial sectors. **DISCLAIMER:** The information provided represents typical properties based on standard specifications. Actual values for specific heats will fall within guaranteed hardenability bands. For critical applications, review of actual Jominy curves and consultation with materials engineering professionals is essential. Proper heat treatment following recommended procedures is required to achieve specified properties. -:- For detailed product information, please contact sales. -: AISI 4626H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4076 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 4626H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4626H Steel Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4626H Steel Foil -:- For detailed product information, please contact sales. -:

Packing of AISI 4626H Steel Foil/Strip -:- 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 547 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