AISI 5140H Steel, normalized

AISI 5140H Steel, normalized Product Information -:- For detailed product information, please contact sales. -: AISI 5140H Steel, normalized Synonyms -:- For detailed product information, please contact sales. -:

AISI 5140H Steel, normalized Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: AISI 5140H Steel, Normalized Condition** ## **Executive Summary** **AISI 5140H steel in the normalized condition** is a **premium-quality, hardenability-graded alloy steel** supplied after undergoing a normalizing heat treatment to refine its microstructure and optimize its properties for subsequent manufacturing. The "H" designation certifies that this material meets **SAE J1268 hardenability band requirements**, ensuring predictable and consistent response to final heat treatment across all production batches. Normalizing produces a **fine-grained, uniform ferrite-pearlite microstructure** that enhances machinability, improves dimensional stability, and provides superior homogeneity compared to as-rolled or forged conditions. This product is engineered for **critical applications where material consistency, reliable heat treatment response, and uniform properties are essential**, particularly in automotive, aerospace, and heavy equipment manufacturing. --- ## **1. Chemical Composition & Hardenability Control** The chemical composition of AISI 5140H is tightly controlled to guarantee consistent hardenability within specified SAE bands. | Element | Composition Range (%) | Typical Target (%) | Metallurgical Function in Normalized "H" Grade | |---------|----------------------|-------------------|-----------------------------------------------| | **Carbon (C)** | 0.38 - 0.43 | 0.40 | Primary hardenability determinant; forms fine pearlite during normalizing for optimal strength-machinability balance | | **Manganese (Mn)** | 0.70 - 0.90 | 0.80 | Tight range ensures consistent transformation kinetics during normalizing and subsequent hardening | | **Phosphorus (P)** | ≤ 0.025 | 0.015 | Tighter control than standard grade; minimizes segregation and temper embrittlement risk | | **Sulfur (S)** | ≤ 0.025 | 0.020 | Controlled for improved machinability while maintaining transverse ductility | | **Silicon (Si)** | 0.15 - 0.35 | 0.25 | Deoxidizer; promotes ferrite formation and contributes to microstructural uniformity | | **Chromium (Cr)** | 0.70 - 0.90 | 0.80 | Primary alloying element; ensures consistent hardenability response and carbide formation | **Key Characteristics of Normalized 5140H:** - **Guaranteed Hardenability:** Must meet SAE J1268 bands when tested from normalized condition - **Enhanced Homogeneity:** Normalizing eliminates chemical segregation from prior processing - **Superior Cleanliness:** Typically produced to enhanced cleanliness standards - **Predictable Transformation:** Consistent microstructure ensures uniform response to final heat treatment - **Tighter Property Ranges:** Mechanical properties show less variation than standard grades **Metallurgical State after Normalizing:** - **Microstructure:** **Fine lamellar pearlite** in **equiaxed ferrite matrix** - **Grain Size:** Typically ASTM 7-9 (finer than annealed condition) - **Carbide Distribution:** Uniformly dispersed fine carbides - **Prior Austenite Grain:** Refined and uniform due to normalizing cycle - **Purpose:** Achieve optimal combination of strength, machinability, and dimensional stability as a pre-hardening condition --- ## **2. Physical & Mechanical Properties (Normalized Condition)** ### **Physical Properties** | Property | Value / Range | Notes | |----------|---------------|-------| | **Density** | 7.85 g/cm³ | At 20°C | | **Modulus of Elasticity** | 195 - 205 GPa | (28.3 - 29.7 × 10⁶ psi) | | **Shear Modulus** | 78 - 82 GPa | - | | **Poisson's Ratio** | 0.29 | Typical for steel | | **Thermal Conductivity** | 43 - 48 W/m·K | At 100°C | | **Coefficient of Thermal Expansion** | 11.8 - 12.3 ×10⁻⁶/K | 20-100°C range | | **Specific Heat Capacity** | 465 - 485 J/kg·K | At 20°C | ### **Mechanical Properties (As-Normalized)** | Property | Typical Range | Significance for Manufacturing | |----------|---------------|-------------------------------| | **Hardness** | **207 - 241 HB** | (Approx. **95 - 102 HRB**) Optimal balance for machining and handling | | **Tensile Strength** | 690 - 830 MPa | (100 - 120 ksi) Higher than annealed, providing better rigidity during machining | | **Yield Strength (0.2%)** | 450 - 585 MPa | (65 - 85 ksi) Improved resistance to deformation during clamping and machining | | **Elongation (50mm)** | 17 - 22% | Good ductility for the strength level | | **Reduction of Area** | 40 - 50% | Excellent micro-ductility | | **Charpy V-Notch Impact** | 40 - 60 J | Superior toughness compared to as-rolled condition | | **Fatigue Strength** | 350 - 400 MPa | Improved resistance to cyclic loading | | **Machinability Rating** | **60-65%** (vs. 1212 steel) | Good with proper tooling and parameters | ### **Normalizing Process for H-Grade Material:** ``` Standard Normalizing Cycle for 5140H: 1. Heating: → 870-900°C (1600-1650°F) at controlled rate 2. Soaking: 30-60 minutes per inch (ensures full transformation) 3. Cooling: Still air or slightly agitated air 4. Cooling Rate: 5-15°C/min through transformation range 5. Temperature Control: ±10°C uniformity required ``` **Quality Parameters for Normalized H-Grade:** - **Microstructural Uniformity:** Consistent pearlite colony size throughout cross-section - **Grain Size Control:** ASTM 7 or finer required - **Decarburization:** ≤0.015" per surface for critical applications - **Hardness Uniformity:** ±15 HB maximum variation across section ### **Hardenability Characteristics (SAE J1268 Bands for 5140H):** | Jominy Position | Distance | Hardness Range (HRC) | Normalized Starting Condition Impact | |-----------------|----------|----------------------|--------------------------------------| | J1 (1/16") | 1.5 mm | 44-52 HRC | Normalizing ensures consistent prior austenite grain size | | J5 (5/16") | 7.9 mm | 39-47 HRC | Uniform microstructure yields predictable hardenability | | J10 (10/16") | 15.9 mm | 32-40 HRC | Guaranteed response from normalized state | | J15 (15/16") | 23.8 mm | 27-35 HRC | Critical for large section hardening | --- ## **3. Product Applications** ### **Targeted Applications for Normalized AISI 5140H** **Automotive Industry (Critical Safety Components):** - **Transmission Gears and Shafts:** Requiring consistent hardening depth for noise control and durability - **Steering and Suspension Components:** Knuckles, arms, and linkages where property consistency ensures reliability - **Engine Components:** Crankshafts, camshafts for performance applications - **Differential Components:** Gears and pinions needing uniform core properties **Aerospace and Defense:** - **Landing Gear Components:** Forgings requiring certified material with consistent properties - **Structural Components:** Where material consistency ensures predictable performance - **Actuator Parts:** Screws, shafts requiring minimal distortion during final heat treatment - **Rotor Components:** Helicopter and aircraft transmission parts **Heavy Equipment and Industrial Machinery:** - **Gearbox Components:** Large gears and pinions requiring uniform properties - **Shafts and Spindles:** Critical rotating components - **Hydraulic Components:** Cylinder rods, piston rods for high-pressure applications - **Mining and Construction:** Wear components requiring consistent heat treatment response **Tooling and Die Applications:** - **Injection Molds:** Cores and cavities requiring dimensional stability - **Die Casting Dies:** Where consistent properties prevent thermal fatigue - **Forming Tools:** Requiring uniform hardness after final heat treatment ### **Manufacturing Advantages of Normalized 5140H:** | Advantage | Technical Benefit | Production Impact | |-----------|-------------------|-------------------| | **Consistent Machinability** | Uniform hardness and microstructure | Predictable tool life, reduced setup adjustments | | **Minimal Distortion** | Stress-relieved structure | Tighter machining tolerances, less rework | | **Predictable Heat Treatment** | Guaranteed hardenability bands | Eliminated process development, reduced scrap | | **Improved Surface Finish** | Fine, uniform microstructure | Better final part quality, reduced finishing time | | **Enhanced Inspection** | Clean, uniform structure | Improved ultrasonic and magnetic particle testing | ### **Typical Manufacturing Workflow:** ``` 1. Material Receipt: Normalized AISI 5140H with full certification 2. Rough Machining: Majority of material removal 3. Semi-Finish Machining: Close-to-final dimensions 4. Stress Relieving: Optional for complex parts 5. Final Heat Treatment: Hardening and tempering using standardized parameters 6. Finish Machining: Light grinding/honing to final dimensions 7. Inspection: Verification against predictable outcomes ``` --- ## **4. International Standards & Specifications** ### **Primary Specifications for Normalized 5140H** | Standard System | Designation | Key Requirements | |----------------|-------------|------------------| | **SAE J1268** | Hardenability Bands | Defines acceptable hardness ranges for H-grades | | **SAE J404** | Chemical Composition | Specifies chemistry ranges for alloy steels | | **ASTM A304** | Steel Bars, Alloy, Subject to End-Quench Hardenability | Governs hardenability testing and certification | | **ASTM A29/A29M** | Steel Bars, Carbon and Alloy | Specifies normalized condition requirements | | **AMS 2300/2301** | Aircraft Quality Steel Cleanliness | Often specified for critical applications | ### **International H-Grade Equivalents (Normalized Condition)** | Country/Region | Standard | Equivalent H-Grade | Normalized Designation | |----------------|----------|-------------------|------------------------| | **Europe (EN)** | EN 10083-3 | **41Cr4+HH** | Condition "+N" (normalized) | | **Germany (DIN)** | DIN 17212 | **41Cr4H** | Normalisiert | | **Japan (JIS)** | JIS G4052 | **SCr440H** | Normalized (N) condition | | **International (ISO)** | ISO 683-18 | **Type 1.7035** | May specify H-grade requirement | | **China (GB)** | GB/T 5216 | **40CrH** | Hardenability-graded, normalized | ### **Certification Requirements:** 1. **Chemical Analysis Certificate:** Full spectrographic analysis 2. **Hardenability Report:** Jominy end-quench test results showing compliance 3. **Mechanical Properties:** Hardness and tensile data from normalized condition 4. **Microstructural Analysis:** Grain size, inclusion rating, microstructure 5. **Normalizing Process Record:** Temperature, time, and cooling details 6. **Heat Treatment Guidelines:** Recommended parameters for final hardening ### **Purchase Specification Example:** ``` MATERIAL: AISI 5140H, Normalized per ASTM A304 CONDITION: Normalized at 880°C, air cooled HARDNESS: 210-235 HB HARDENABILITY: Must comply with SAE J1268 bands for 5140H CERTIFICATION: Mill test certificate with hardenability curve required ADDITIONAL: AMS 2301 cleanliness, grain size ASTM 7-9 ``` --- ## **5. Manufacturing & Processing Guidelines** ### **Optimal Machining Parameters:** ``` For Normalized 5140H (210-235 HB): • Turning Speed: 35-60 m/min (carbide inserts) • Feed Rate: 0.15-0.30 mm/rev • Depth of Cut: 2-4mm for roughing, 0.5-1.0mm for finishing • Tool Materials: C2/C3 carbide grades, TiCN or AlTiN coated • Coolant: Water-soluble oil or synthetic emulsion • Chip Control: Good with proper tool geometry • Surface Finish: 1.6-3.2 μm Ra easily achievable ``` ### **Heat Treatment from Normalized State:** **Standard Process for Final Hardening:** - **Preheating:** 650-700°C (optional for complex parts) - **Austenitizing:** 845-860°C (1550-1580°F) for 20-30 min/inch - **Quenching:** Oil quench, medium agitation - **Tempering:** 540°C (1000°F) yields 35-40 HRC ±1 HRC - **Stress Relieving:** Optional at 590-620°C for dimensional stability **Guaranteed Outcomes from Normalized Starting Condition:** 1. **Uniform Hardness Penetration:** Consistent case depth 2. **Minimal Distortion:** <0.1% dimensional change typical 3. **Predictable Mechanical Properties:** Tensile: 1000-1150 MPa, Yield: 850-1000 MPa 4. **Consistent Impact Toughness:** 35-50 J Charpy V-notch ### **Quality Control in Production:** **Incoming Material Checks:** 1. **Hardness Verification:** Multiple locations, statistical analysis 2. **Microstructure Audit:** Sample check for normalized structure 3. **Chemistry Cross-Check:** Verification against certificate 4. **Dimensional Verification:** For precision bar stock **Process Control Advantages:** - **Reduced Scrap Rate:** Typically 1-3% compared to 5-8% for standard grades - **Eliminated Sorting:** No need to group parts by heat treat response - **Simplified Process:** One heat treat recipe works for all material batches - **Improved First-Pass Yield:** >95% achievable with proper controls --- ## **6. Technical Comparison & Selection Guide** ### **Comparison: Normalized 5140H vs. Standard Normalized 5140** | Parameter | AISI 5140 (Standard) | **AISI 5140H (H-Grade)** | Advantage | |-----------|----------------------|--------------------------|-----------| | **Chemistry Control** | Standard ranges | Tightened ranges | Consistent properties | | **Hardenability** | Variable within grade | Guaranteed SAE bands | Predictable hardening | | **Property Uniformity** | Good | Excellent | Reduced machining variation | | **Microstructure** | Normalized | More uniform normalized structure | Better machinability | | **Certification** | Basic MTC | Full hardenability report | Enhanced traceability | | **Cost Premium** | Base | +15-30% | Justified by process savings | | **Best Application** | General parts | **Critical, high-volume components** | Reliability & consistency | ### **When to Specify Normalized AISI 5140H:** - **✔** High-volume production of safety-critical components - **✔** Applications requiring certified and consistent material properties - **✔** Automated manufacturing with minimal process adjustment - **✔** Global sourcing requiring identical material response - **✔** Just-in-time manufacturing where consistency is vital - **✔** Components subject to rigorous quality audits - **✘** Prototypes or one-off parts - **✘** Non-critical applications with cost constraints - **✘** Applications where property variation is acceptable ### **Economic Justification Analysis:** **Cost-Benefit for 50,000 Part Production Run:** | Cost Component | Standard 5140 | 5140H | Savings/Value | |----------------|---------------|-------|---------------| | Material Cost | $500,000 | $575,000 | -$75,000 | | Machining Efficiency | Base | +12% faster | +$40,000 | | Heat Treat Scrap | $90,000 | $30,000 | +$60,000 | | Inspection/QC | $50,000 | $25,000 | +$25,000 | | Warranty/Returns | $30,000 | $10,000 | +$20,000 | | **Total Cost** | **$670,000** | **$640,000** | **+$30,000** | **Net Savings:** 4.5% overall despite higher material cost --- ## **7. Quality Assurance & Testing Protocol** ### **Mandatory Testing for Normalized 5140H** | Test | Standard Method | Frequency | Acceptance Criteria | |------|----------------|-----------|---------------------| | **Chemical Analysis** | ASTM E415/E1086 | Each heat | Within specified ranges | | **Hardenability Test** | SAE J406 (Jominy) | Each heat | Within SAE J1268 bands | | **Hardness Test** | ASTM E10 (Brinell) | Each lot | 207-241 HB | | **Grain Size** | ASTM E112 | Each heat | ASTM 7-9 | | **Microcleanliness** | ASTM E45 | Each heat | Specified inclusion ratings | | **Tensile Test** | ASTM A370 | Each heat/lot | Meet typical ranges | | **Impact Test** | ASTM A370 | As specified | ≥40 J at 20°C | ### **Statistical Quality Requirements:** - **Hardness Control:** CpK ≥ 1.33 for normalized condition - **Chemistry Control:** All elements within middle 50% of specification - **Dimensional Tolerances:** ±0.1mm for precision ground stock - **Surface Quality:** Free of seams, laps, and excessive decarburization ### **Certification Package Includes:** 1. **Mill Test Certificate:** Full traceability to heat number 2. **Hardenability Curve:** Actual Jominy test data points 3. **Chemical Analysis Report:** Complete elemental analysis 4. **Mechanical Test Results:** From normalized condition 5. **Microstructural Report:** Grain size and inclusion rating 6. **Heat Treatment Guidelines:** Recommended parameters 7. **Material Safety Data Sheet:** Handling and safety information --- ## **8. Supply Chain & Technical Support** ### **Available Product Forms:** - **Round Bars:** 10mm to 400mm diameter, precision ground available - **Flat Bars:** Various thicknesses and widths - **Forged Blanks:** Custom shapes to near-net form - **Billets and Blooms:** For subsequent forging operations - **Plate:** Up to 150mm thickness ### **Lead Time and Availability:** - **Standard Sizes:** 4-8 weeks from certified distributors - **Custom Forgings:** 12-20 weeks with full certification - **Mill Direct:** 8-16 weeks for certified heats - **Global Stock:** Limited sizes available from international suppliers ### **Technical Support Services:** - **Heat Treatment Consultation:** Recommended parameters for specific applications - **Machining Guidelines:** Optimal tooling and parameters - **Failure Analysis:** Support for quality issues - **Process Optimization:** Assistance with manufacturing workflows - **Material Selection Guidance:** Help with application-specific choices --- ## **Summary** **AISI 5140H steel in the normalized condition represents the optimal starting point for manufacturing high-reliability components requiring consistent final properties.** It combines the benefits of normalizing—grain refinement, stress relief, and property uniformity—with the guaranteed hardenability of the H-grade system. **Key Value Propositions:** 1. **Predictable Performance:** Guaranteed hardenability ensures identical heat treatment results across all production batches 2. **Manufacturing Efficiency:** Consistent normalized properties optimize machining operations and tool life 3. **Quality Assurance:** Full certification and traceability simplify compliance with industry standards 4. **Risk Reduction:** Eliminates variability in final heat treatment, reducing scrap and rework 5. **Total Cost Effectiveness:** Higher material cost offset by significant savings in processing, quality control, and warranty costs **Ideal Application Profile:** - **Automotive safety components** requiring batch-to-batch consistency - **Aerospace structural parts** needing certified material properties - **Heavy equipment components** subject to demanding service conditions - **Precision machinery parts** where dimensional stability is critical - **Global manufacturing** requiring identical material response from multiple sources **Final Recommendation:** **Specify normalized AISI 5140H when** component reliability, manufacturing consistency, and predictable performance are critical success factors. For applications where the cost of variability—in scrap rates, heat treat adjustments, inspection time, or field failures—exceeds the premium for guaranteed material consistency, 5140H delivers compelling value throughout the product lifecycle. This material represents a **complete manufacturing solution** that provides certainty in material behavior, enabling optimized processes, reduced waste, and enhanced product reliability in the most demanding applications. -:- For detailed product information, please contact sales. -: AISI 5140H Steel, normalized Specification Dimensions Size： Diameter 20-1000 mm Length <6291 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 5140H Steel, normalized Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 5140H Steel, normalized -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 5140H Steel, normalized -:- For detailed product information, please contact sales. -:

Packing of AISI 5140H Steel, normalized -:- 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 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 2762 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