AISI E4340 H Steel Foil/Strip,

AISI E4340 H Steel Foil, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: AISI E4340 H Steel Foil, annealed, 25 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI E4340 H Steel, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: # **AISI E4340H Alloy Steel Round Bar (Annealed Condition)** ## **Guaranteed Hardenability Steel - 25mm Diameter** --- ### **1. PRODUCT OVERVIEW** **AISI E4340H Steel, Annealed Condition** - **Product Form:** 25mm (1 inch) diameter round bar - **Condition:** Annealed for optimal machinability - **Special Feature:** "H" designation indicates controlled hardenability range - **Key Advantage:** Predictable heat treatment response for consistent through-hardening **Critical Distinction: E4340 vs E4340H** - **Standard E4340:** Standard composition ranges - **E4340H:** Composition controlled to ensure specific hardenability bands as per ASTM A304 - **Guarantee:** Jominy end-quench test results within specified bands - **Benefit:** Reduced variation in heat treatment results across different production batches --- ### **2. CHEMICAL COMPOSITION (H-STEEL RANGES)** | Element | Standard 4340 Range (%) | E4340H Controlled Range (%) | Primary Function | |---------|-------------------------|-----------------------------|------------------| | **Carbon (C)** | 0.38-0.43 | 0.37-0.44 | Base hardenability & strength | | **Manganese (Mn)** | 0.60-0.80 | 0.65-0.85 | Hardenability control element | | **Silicon (Si)** | 0.15-0.30 | 0.15-0.35 | Deoxidizer, strength | | **Nickel (Ni)** | 1.65-2.00 | 1.55-2.00 | Toughness, hardenability | | **Chromium (Cr)** | 0.70-0.90 | 0.65-0.95 | Hardenability, wear resistance | | **Molybdenum (Mo)** | 0.20-0.30 | 0.20-0.30 | Grain refinement, strength | | **Phosphorus (P)** | ≤0.035 | ≤0.025 | Tighter impurity control | | **Sulfur (S)** | ≤0.040 | ≤0.025 | Tighter impurity control | | **Boron (B)** | - | Optional: 0.0005-0.003 | Hardenability enhancer | **Note:** E4340H chemistry is adjusted lot-to-lot to hit precise hardenability bands rather than fixed composition ranges. --- ### **3. MATERIAL SPECIFICATIONS & STANDARDS** | Standard | Number | Title | Relevance to E4340H | |----------|--------|-------|---------------------| | **ASTM** | A304 | Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements | **Primary H-steel standard** | | **ASTM** | A29/A29M | Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished | General bar requirements | | **SAE** | J1268 | Hardenability Bands for Hardenability Steels | H-band specifications | | **AMS** | 6414H | Steel Bars, Forging, and Tubing 1.65Ni-0.80Cr-0.35Mo (0.38-0.43C) | Aerospace H-version | | **ISO** | 683-11 | Heat-treatable steels, alloy steels and free-cutting steels - Part 11: Hardenability steels | International equivalent | | **DIN** | 1.6565H | 34CrNiMo6 H-version | European equivalent | --- ### **4. HARDENABILITY DATA (JOMINY TEST)** **Guaranteed Hardenability Bands for 25mm Section:** | Distance from Quenched End | Hardness Range (HRC) | Corresponding Microstructure | |----------------------------|----------------------|------------------------------| | 1.5 mm (1/16 inch) | 50-57 HRC | 90-100% Martensite | | 5 mm (3/16 inch) | 47-54 HRC | 80-90% Martensite | | 10 mm (3/8 inch) | 40-48 HRC | 50-70% Martensite | | 15 mm (5/8 inch) | 35-42 HRC | 30-50% Martensite | | 20 mm (3/4 inch) | 30-38 HRC | Pearlite/Bainite formation | **Center of 25mm Bar Prediction:** - **Oil Quench:** 35-42 HRC at center - **Water Quench:** 40-48 HRC at center - **Assurance:** Consistent through-hardening across full diameter --- ### **5. MECHANICAL PROPERTIES (ANNEALED CONDITION)** | Property | Typical Value | Testing Standard | Notes | |----------|---------------|------------------|-------| | **Hardness** | 197-241 HB (93-100 HRB) | ASTM E10 | Optimized for machining | | **Tensile Strength** | 620-750 MPa | ASTM E8/E8M | As-annealed | | **Yield Strength** | 380-480 MPa | ASTM E8/E8M | As-annealed | | **Elongation** | 20-25% | ASTM E8/E8M | In 50mm gauge length | | **Reduction of Area** | 45-55% | ASTM E8/E8M | Good ductility | | **Machinability Rating** | 60% (of B1112 steel) | - | Favorable for turning/ milling | **Annealing Microstructure:** - **Structure:** Spheroidized carbide in ferrite matrix - **Grain Size:** ASTM 5-7 - **Uniformity:** Consistent throughout cross-section --- ### **6. PHYSICAL PROPERTIES** | Property | Value | Conditions | |----------|-------|------------| | Density | 7.85 g/cm³ | At 20°C | | Melting Point | 1420-1460°C | Approximate range | | Thermal Conductivity | 42.0 W/m·K | Annealed, at 100°C | | Specific Heat Capacity | 460 J/kg·K | At 20°C | | Electrical Resistivity | 0.24 µΩ·m | At 20°C | | Modulus of Elasticity | 205 GPa | - | | Poisson's Ratio | 0.29 | - | --- ### **7. TYPICAL APPLICATIONS** #### **Automotive & Truck Components** - **Gears & Pinions:** Transmission gears, differential pinions - **Axles & Shafts:** Truck axles, power take-off shafts - **Crankshafts:** High-performance engine crankshafts - **Critical Bolts:** Engine head bolts, connecting rod bolts #### **Aerospace Components** - **Landing Gear Parts:** Forgings for machining - **Engine Mounts:** Structural components - **Actuator Components:** High-strength moving parts #### **Industrial Equipment** - **Large Gears:** Industrial gearbox components - **Heavy Machinery:** Excavator pins, bearing races - **Oilfield Tools:** Drill string components, tool joints #### **Why E4340H vs Standard E4340 for These Applications:** 1. **Consistent Heat Treatment:** Less distortion, uniform hardness 2. **Reduced Scrap Rate:** Predictable hardening response 3. **Better Fatigue Performance:** Uniform microstructure 4. **Interchangeability:** Components from different batches behave identically --- ### **8. HEAT TREATMENT GUIDELINES** #### **Recommended Heat Treatment for 25mm Bars:** | Process | Temperature | Medium | Holding Time* | |---------|-------------|---------|---------------| | **Annealing** | 830-850°C | Furnace cool | 1.5-2 hours | | **Normalizing** | 870-890°C | Air cool | 30-45 min | | **Hardening** | 830-850°C | Oil quench | 45-60 min | | **Tempering** | 200-650°C | Air cool | 1-2 hours | *Holding times based on 25mm diameter; adjust for actual furnace loads. #### **Expected Properties After Heat Treatment (Example):** - **Oil Quench + 540°C Temper:** 1100-1200 MPa UTS, 35-40 HRC - **Water Quench + 200°C Temper:** 1800-2000 MPa UTS, 48-52 HRC --- ### **9. PROCESSING CHARACTERISTICS** #### **Machinability (Annealed Condition):** - **Relative Rating:** Good (60% of B1112 standard) - **Recommended Speed:** 30-45 m/min for turning - **Feed Rate:** 0.15-0.30 mm/rev - **Tool Material:** Coated carbide or high-speed steel - **Chip Formation:** Continuous chips with proper tool geometry #### **Forging:** - **Temperature Range:** 1150-900°C - **Finishing Temperature:** ≥850°C - **Post-Forging:** Must be annealed or normalized #### **Weldability:** - **Rating:** Poor (requires precautions) - **Preheat:** 200-300°C minimum - **Method:** Low-hydrogen processes (SMAW, GTAW) - **Post-Weld:** Full heat treatment recommended --- ### **10. QUALITY ASSURANCE** #### **Mandatory Testing for E4340H:** 1. **Chemical Analysis:** Spectroscopic verification 2. **Hardenability Test:** Jominy end-quench per ASTM A255 3. **Hardness Verification:** Multiple points on bar surface 4. **Macroetch Test:** Check for segregation, piping #### **Certification Provided:** - Material Test Certificate 3.1 per EN 10204 - Hardenability curve with actual test results - Chemical analysis report - Heat treatment recommendations --- ### **11. PACKAGING & IDENTIFICATION** #### **Standard Packaging:** - **Bundle Weight:** 1-3 metric tons - **Protection:** Rust preventive coating or VCI paper - **Marking:** Heat number, grade (E4340H), size, supplier ID - **End Tags:** Color-coded for grade identification #### **Traceability:** - Complete mill history including: - Heat/melt number - Forging/piercing details (if applicable) - Heat treatment records - Test reports with unique identification --- ### **12. TECHNICAL ADVANTAGES SUMMARY** **For Design Engineers:** - Predictable hardening depth in 25mm sections - Consistent mechanical properties after heat treatment - Reduced risk of soft spots or excessive distortion **For Manufacturers:** - Lower rejection rates in heat treatment - Reduced machining time due to consistent hardness - Better tool life predictability - Suitable for automated production lines **For Quality Assurance:** - Documented hardenability curves - Tight compositional control - Full traceability from melt to final bar --- **COMPLIANCE STATEMENT:** This AISI E4340H steel is produced in compliance with ASTM A304 requirements for hardenability steels. The guaranteed hardenability bands ensure consistent performance in heat treatment, making it particularly suitable for safety-critical components where predictable mechanical properties are essential. For specific application requirements, consult with our technical service team for customized recommendations. **Note:** All values are typical for properly processed material. Actual results may vary within specified ranges. For critical applications, testing of actual production material is recommended. -:- For detailed product information, please contact sales. -: AISI E4340 H Steel, annealed, 25 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <4068 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 E4340 H Steel, annealed, 25 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI E4340 H Steel Foil, annealed, 25 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI E4340 H Steel Foil, annealed, 25 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI E4340 H Steel Foil/Strip, annealed, 25 mm 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 539 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