AISI 5046H Steel Sheet,Plate

AISI 5046H Steel Sheet/Plate Product Information -:- For detailed product information, please contact sales. -: AISI 5046H Steel Sheet/Plate Synonyms -:- For detailed product information, please contact sales. -:

AISI 5046H Steel Product Information -:- For detailed product information, please contact sales. -: ## **Technical Specification: AISI 5046H (UNS H50460) Steel - Hardenability-Guaranteed Medium Carbon Chromium Steel** ### **1. Product Overview** **AISI 5046H** is a **hardenability-guaranteed, medium-carbon chromium alloy steel** that provides predictable and consistent through-hardening characteristics for quality-critical applications. The designation follows the SAE/AISI system where "50" indicates a nominal carbon content of approximately 0.48%, "46" specifies the chromium content range, and the critical **"H" suffix** signifies compliance with specific hardenability bands as defined by end-quench (Jominy) testing standards. This steel offers manufacturers the assurance of **batch-to-batch consistency** in heat treatment response while maintaining the cost advantages of a moderately alloyed chromium steel. It is engineered for components requiring **reliable and uniform mechanical properties** across production runs, particularly in automotive and general manufacturing applications. **Key Value Propositions:** - **Guaranteed Hardenability Consistency:** Each heat lot is certified to fall within SAE J1268 hardenability bands, ensuring uniform depth of hardening and mechanical properties - **Reduced Manufacturing Risk:** Predictable transformation behavior minimizes heat treatment distortion, cracking, and property variations - **Cost-Effective Quality Assurance:** Provides the reliability of higher alloy steels at a lower material cost - **Optimized Production Efficiency:** Enables precise machining and heat treatment process control due to predictable material behavior - **Improved Component Reliability:** Consistent properties lead to more predictable service performance and reduced warranty claims --- ### **2. Chemical Composition (Weight %)** The composition for 5046H is controlled within broader ranges than standard 5046 to achieve specific hardenability bands rather than fixed chemical limits. | Element | AISI 5046H Range (%) | Metallurgical Function & Hardenability Control | | :--- | :--- | :--- | | **Iron (Fe)** | Balance | Base Element | | **Carbon (C)** | 0.44 - 0.49 | **Primary strength determinant;** controlled to center the hardenability band while optimizing strength and wear resistance | | **Manganese (Mn)** | 0.70 - 0.90 | **Primary hardenability adjuster;** actively managed within this range to position the Jominy curve within the H-band | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; provides solid solution strengthening | | **Chromium (Cr)** | 0.20 - 0.35 | Enhances hardenability, wear resistance, and provides mild corrosion protection | | **Sulfur (S)** | 0.020 - 0.035 (Typical) | Optimized for machinability while maintaining transverse properties | | **Phosphorus (P)** | ≤ 0.025 (Premium) | Kept exceptionally low to ensure good impact toughness in hardened condition | | **Other Elements** | - | Typically no nickel, molybdenum, or boron additions | **Hardenability Certification:** The defining characteristic is compliance with **SAE J1268** H-band specifications. The steel producer adjusts the melt chemistry (particularly Mn and Cr within their ranges) to ensure each heat's Jominy curve falls between the established minimum and maximum limits for 5046H. --- ### **3. Typical Mechanical & Physical Properties** *Properties after oil quenching from 845°C (1550°F) and tempering, based on 25mm (1") diameter bar:* | Property | Low Temperature Temper (205°C/400°F) | Medium Temperature Temper (425°C/800°F) | High Temperature Temper (540°C/1000°F) | | :--- | :--- | :--- | :--- | | **Hardness** | 50-54 HRC | 38-43 HRC | 28-33 HRC | | **Tensile Strength** | 1550-1750 MPa (225-254 ksi) | 1150-1350 MPa (167-196 ksi) | 850-1050 MPa (123-152 ksi) | | **Yield Strength (0.2%)** | 1350-1550 MPa (196-225 ksi) | 1000-1200 MPa (145-174 ksi) | 700-900 MPa (102-131 ksi) | | **Elongation** | 10-15% | 13-18% | 18-24% | | **Reduction of Area** | 35-45% | 45-55% | 55-65% | | **Charpy V-Notch Impact** | 25-35 J (18-26 ft-lb) | 35-50 J (26-37 ft-lb) | 50-70 J (37-52 ft-lb) | | **Annealed Hardness** | **163-207 HB** (Machining condition, per ASTM A304) | | | **Guaranteed Hardenability (SAE J1268 Typical Band for 5046H):** - Distance from quenched end for 50 HRC: **J₄-J₁₀** (4/16" to 10/16") - Distance from quenched end for 40 HRC: **J₁₂-J₂₂** (12/16" to 22/16") - Distance from quenched end for 30 HRC: **J₂₀-J₃₅** (20/16" to 35/16") - Ideal hardenability for sections up to: **38mm (1.5") diameter** with oil quench **Physical Properties:** - Density: 7.85 g/cm³ (0.284 lb/in³) - Modulus of Elasticity: 205 GPa (29.7 × 10⁶ psi) - Thermal Conductivity: 48 W/m·K at 100°C - Specific Heat: 460 J/kg·K - Critical Transformation Temperatures: Ac₁ ≈ 725°C, Ac₃ ≈ 780°C --- ### **4. Heat Treatment Characteristics** **Normalizing (Pre-machining):** 870-900°C (1600-1650°F), air cool. Produces uniform fine-grained structure. **Annealing (Optimal machinability):** 790-815°C (1450-1500°F), furnace cool to 480°C at ≤25°C/hr, then air cool. Target hardness: 163-207 HB. **Austenitizing for Hardening:** **830-855°C (1525-1575°F).** Soak time: 30-60 minutes per inch of thickness. **Quenching:** **Agitated oil quench** recommended for all but the simplest shapes. Water quench generally not recommended due to cracking risk with this carbon content. **Tempering:** **Must begin within 2 hours** of quenching. Recommended ranges: - **Maximum wear resistance:** 150-260°C (300-500°F) for 1-2 hrs/inch - **General purpose/optimum balance:** 370-480°C (700-900°F) for 1-2 hrs/inch - **High toughness emphasis:** 540-650°C (1000-1200°F) for 1-2 hrs/inch **Stress Relieving:** 550-600°C (1025-1110°F) for 1 hour per inch, slow cool. --- ### **5. Target Applications** **5046H is specified for quality-critical components where predictable hardening is essential for performance and manufacturability:** | Industry | Specific Applications | Rationale for 5046H Selection | | :--- | :--- | :--- | | **Automotive (Volume Production)** | **Axle shafts** (light truck), **steering linkage components**, **transmission shafts**, **gear blanks**, **sprockets** | Consistent hardenability ensures uniform fatigue performance and dimensional stability in high-volume production | | **Agricultural Equipment** | **Implement drivelines**, **PTO shafts**, **tractor linkage pins**, **harvester components** | Predictable hardening in varying sections withstands abrasive environments | | **General Manufacturing** | **Machine tool shafts**, **power transmission components**, **industrial rollers**, **couplings** | Reduced heat treatment variability improves manufacturing yield and component reliability | | **Material Handling** | **Conveyor drive components**, **forklift mast rollers**, **warehouse equipment shafts** | Consistent properties in repetitive loading applications | | **Hydraulic Components** | **Cylinder rods** (medium pressure), **pump shafts**, **valve components** | Reliable performance in fluid power applications | | **Fastener Industry** | **High-strength bolts** (Grade 8.8 equivalent), **studs**, **specialty pins** | Consistent hardening critical for fastener reliability | **Economic Application Profile:** - **Optimal section size:** 15-38mm (0.6-1.5") diameter - **Production volume:** >10,000 pieces annually - **Quality requirement:** Parts requiring consistent case depth and core properties - **Cost position:** Where 1045H lacks hardenability but 4140H is over-specified --- ### **6. International Standards & Equivalents** | Standard System | Designation | Equivalent / Notes | | :--- | :--- | :--- | | **USA (Primary)** | **AISI 5046H** / **SAE J404** | **UNS H50460** | | **USA (Product Standard)** | **ASTM A304** | Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements | | **USA (Testing Standard)** | **SAE J1268** | Hardenability Bands for Alloy Steels | | **ISO** | **ISO 683-1** | **1.7016** with specified hardenability requirements | | **Europe** | **EN 10083-3** | **46Cr2 + H** (Similar concept with hardenability guarantee) | | **Germany** | **DIN 17200** | **46Cr2 + H** (1.7006 with hardenability guarantee) | | **Japan** | **JIS G4104** | **SCr440H** (Hardenability-guaranteed version) | | **China** | **GB/T 5216** | **46CrH** (Chromium steel with hardenability guarantee) | **Procurement Specification Example:** ``` MATERIAL: AISI 5046H per ASTM A304 CONDITION: Hot rolled, annealed to 163-207 HB HARDENABILITY: To meet SAE J1268 H-band for 5046H CERTIFICATION: Mill test report with Jominy hardenability curve required CHEMISTRY: Conform to AISI 5046H ranges SIZE: 30mm diameter round, +0/-0.25mm tolerance SPECIAL REQUIREMENTS: Grain size ASTM 5 or finer ``` --- ### **7. Quality Assurance & Testing Requirements** **Mandatory Certification (per ASTM A304):** 1. **Chemical Analysis Report** - Full spectrographic analysis 2. **Jominy Hardenability Certificate** - Actual test data showing compliance with SAE J1268 H-band 3. **Mechanical Test Report** - From representative sample in supplied condition **Enhanced Quality Requirements (for critical applications):** - **Grain Size Analysis:** ASTM E112, minimum ASTM No. 5 (typically 5-7) - **Microcleanliness:** ASTM E45 inclusion rating, typically A≤B1, C≤1 - **Macroetch Test:** ASTM E381 to check for segregation or unsoundness - **Decarburization Check:** Maximum depth specified (typically 0.3mm max total decarb) - **Non-Destructive Testing:** Ultrasonic testing per ASTM A388 for critical applications **Hardenability Band Verification:** The Jominy certificate must include: - Actual hardness values at standard distances (J₁, J₃, J₅, J₇, J₉, J₁₁, J₁₃, J₁₅, J₂₀) - Graphical plot overlaying SAE minimum and maximum curves for 5046H - Heat number and test date correlation - Compliance statement with SAE J1268 --- ### **8. Manufacturing Guidelines** **Machining (Annealed Condition: 163-207 HB):** - **Turning:** Carbide inserts, 80-120 m/min, 0.2-0.4 mm/rev feed - **Drilling:** HSS drills, 25-35 m/min, peck drilling for deep holes - **Milling:** 70-100 m/min, moderate feeds - **Threading:** Use premium coated taps, reduce speed by 25% vs. free-machining steels - **Chip Control:** Good with optimized tool geometry and appropriate sulfur content **Forging:** - **Temperature Range:** 1150-1200°C (2100-2200°F) start, finish above 850°C (1560°F) - **Reduction Ratio:** Minimum 3:1 recommended for homogenization - **Post-forging Cooling:** Air cool for simple shapes; slow furnace cool for complex shapes **Welding (Limited Applications):** - **Preheat:** 150-200°C (300-400°F) for sections >12mm - **Electrodes:** Low-hydrogen type (AWS E10018-D2 or equivalent) - **Post-Weld Heat Treatment:** Stress relieve at 595-650°C (1100-1200°F) for 1 hr/inch - **Restrictions:** Not recommended for highly stressed or critical welds **Grinding (After Heat Treatment):** - Use aluminum oxide wheels, hardness J-K - Maintain wheel sharpness to prevent burning - Use soluble oil coolant at proper concentration - Consider CBN wheels for production grinding operations --- ### **9. Comparative Analysis with Similar H-Steels** | Grade Comparison | 5046H | 5046 (Standard) | 4140H | 1045H | | :--- | :--- | :--- | :--- | :--- | | **Cost Index** | **1.00** | 0.95 | 1.30 | 0.85 | | **Hardenability Depth (50 HRC)** | J₄-J₁₀ | Variable | J₁₀-J₂₀ | J₂-J₆ | | **Max Section for Through-Hardening** | **38mm** | ~25mm | **75mm** | ~15mm | | **Max Hardness (as-quenched)** | 54-58 HRC | 54-58 HRC | 55-58 HRC | 52-55 HRC | | **Toughness (Charpy @ 425°C temper)** | 35-50 J | 30-45 J | 45-65 J | 30-40 J | | **Primary Advantage** | **Cost + Consistency** | Lowest Cost | Superior Properties | Lowest Cost with Guarantee | | **Typical Price Premium** | 5-10% over 5046 | - | 25-35% over 5046H | 10-15% less than 5046H | **Technical Justification for 5046H Selection:** 1. **When consistent hardening depth** is required but premium alloy properties are unnecessary 2. **For high-volume components** where heat treatment uniformity affects assembly and performance 3. **As a cost-effective upgrade** from 1045H when deeper hardening is needed 4. **When replacing 4140H** in non-critical applications to reduce material cost by 25-35% **Performance Limitations:** - **Not suitable** for sections >38mm requiring full through-hardening - **Avoid** for applications requiring Charpy impact >60 J consistently - **Not recommended** for temperatures above 300°C (570°F) continuous service - **Limited weldability** compared to lower carbon steels --- ### **10. Failure Prevention & Quality Control** | Common Production Issue | Root Cause | Corrective Action | | :--- | :--- | :--- | | **Variable hardness in production** | Hardenability variation between heats | Require Jominy certification for each heat; implement SPC | | **Quench cracking in complex shapes** | High carbon content + inadequate design | Redesign with generous radii (min R=3mm); use slower quench oil | | **Poor machinability variation** | Hardness variation in annealed condition | Specify hardness range (163-207 HB); verify annealing process | | **Inconsistent dimensional change** | Variable transformation characteristics | Use Jominy data to predict dimensional changes; adjust tooling | | **Premature wear or failure** | Insufficient or inconsistent surface hardness | Verify heat treatment process; implement shot peening | **Service Life Optimization Strategies:** - **For abrasive wear:** Consider induction hardening of wear surfaces - **For bending fatigue:** Implement shot peening (0.006-0.010"A intensity) - **For corrosion environments:** Specify phosphate coating or electroless nickel - **For impact applications:** Design with compressive pre-stressing in critical areas --- ### **11. Economic Analysis & Value Proposition** **Cost Structure Analysis:** - Base steel cost: 100% (relative to 5046H as baseline) - 5046 (standard): 90-95% - 4140H: 125-135% - 4340H: 200-220% - 1045H: 80-90% **Total Cost of Ownership Advantages:** 1. **Reduced heat treatment scrap:** Consistent hardenability lowers rejection rates by 2-4% 2. **Improved manufacturing yield:** Predictable dimensional changes improve fit-up and reduce rework 3. **Extended tool life:** Consistent machinability reduces tooling costs by 8-12% 4. **Reduced warranty claims:** More consistent properties lead to fewer field failures **Return on Investment Calculation Example:** ``` Scenario: Replacement of 4140H with 5046H in axle shaft production Material cost savings: 28% Additional quality assurance: 2% Net savings: 26% Production volume: 40,000 parts/year Material cost/part (4140H): $12.50 Annual savings: 40,000 × $12.50 × 26% = $130,000 Implementation cost: $25,000 (testing, qualification) Payback period: <3 months ``` **Implementation Strategy for New Applications:** 1. **Technical evaluation:** Review design requirements and confirm 5046H suitability 2. **Pilot production:** 1,000-2,000 pieces with full testing and validation 3. **Process optimization:** Fine-tune machining and heat treatment parameters 4. **Quality monitoring:** Establish SPC charts for key parameters 5. **Full implementation:** Phase in over 2-4 production cycles --- ### **12. Industry Trends & Future Outlook** **Current Market Position:** - Growing adoption in automotive component manufacturing - Increasing use as a 4140H alternative for cost reduction initiatives - Expanding applications in agricultural and off-highway equipment - Recognition as a "value engineering" material without quality compromise **Technological Developments:** - Improved inclusion control through better steelmaking practices - Enhanced hardenability prediction models - Development of modified versions with microalloying additions - Integration with advanced heat treatment technologies **Sustainability Considerations:** - **Recyclability:** 100% recyclable through standard steel recycling - **Energy content:** Lower than higher alloy steels due to reduced chromium - **Production efficiency:** Consistent properties reduce manufacturing waste - **Life cycle:** Good durability with proper design and application --- ### **Summary** **AISI 5046H** represents a **strategically optimized engineering material** that bridges the gap between cost-driven commodity steels and premium alloy grades. Its **guaranteed hardenability** provides manufacturers with the **predictability and consistency** required for modern, high-volume production systems, while its **moderate chromium content** maintains a **significant cost advantage** over more highly alloyed steels. This steel is particularly valuable in applications where **consistent heat treatment response** directly impacts manufacturing yield, component performance, and overall product reliability. The "H" designation provides a **verifiable quality assurance** that enables precise process control and reduces manufacturing risk. For engineers and procurement specialists, 5046H offers a **compelling value proposition**: the reliability of guaranteed hardenability at a cost position that makes economic sense for a wide range of medium-duty applications. When properly specified with the required certifications and integrated into well-controlled manufacturing processes, 5046H delivers **consistent performance, reduced total cost, and improved product quality** across high-volume production environments. -:- For detailed product information, please contact sales. -: AISI 5046H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6273 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 5046H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 5046H Steel Sheet,Plate -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 5046H Steel Sheet,Plate -:- For detailed product information, please contact sales. -:

Packing of AISI 5046H Steel Sheet/Plate -:- 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 Sheet/Plate 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 2744 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