AISI 4130H Steel, annealed

AISI 4130H Steel, annealed at 865°C (1590°F) Product Information -:- For detailed product information, please contact sales. -: AISI 4130H Steel, annealed at 865°C (1590°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 4130H Steel, annealed at 865°C (1590°F) Product Information -:- For detailed product information, please contact sales. -: # **Technical Data Sheet: AISI 4130H Steel, Annealed Condition** ## **Product Identification** **Designation:** AISI 4130H Steel, Hardenability-Guaranteed **Heat Treatment:** Full Annealing at 865°C (1590°F) **Material Classification:** Chromium-Molybdenum Low-Alloy H-Steel **Condition State:** Fully annealed - softest condition for maximum formability **Special Feature:** Guaranteed hardenability band (H-Steel) --- ## **1. Chemical Composition (H-Steel Controlled)** AISI 4130H features controlled chemistry to ensure predictable hardenability after final heat treatment: | Element | Standard Range (%) | H-Steel Control Features | Metallurgical Function | |---------|-------------------|--------------------------|------------------------| | **Carbon (C)** | 0.28 - 0.33 | Tightly controlled within band | Primary strengthening element | | **Manganese (Mn)** | 0.40 - 0.70 | Broad range for hardenability adjustment | Major hardenability enhancer | | **Silicon (Si)** | 0.15 - 0.35 | Standard control | Deoxidizer, solid solution strengthener | | **Chromium (Cr)** | 0.80 - 1.10 | Critical for hardenability consistency | Enhances hardenability and corrosion resistance | | **Molybdenum (Mo)** | 0.15 - 0.25 | Precisely controlled | Improves hardenability, reduces temper embrittlement | | **Phosphorus (P)** | ≤ 0.025 | Tighter than standard 4130 | Residual element control | | **Sulfur (S)** | ≤ 0.025 | Tighter than standard 4130 | Machinability and property control | **H-Steel Certification:** Each heat is certified to fall within specified Jominy hardenability bands per SAE J1268, regardless of exact chemistry within these ranges. --- ## **2. Annealing Process Specification** ### **Full Annealing Parameters:** - **Austenitizing Temperature:** 865°C (1590°F) ± 10°C - **Soaking Time:** 1-2 hours per inch of thickness (minimum 1 hour) - **Cooling Rate:** Controlled furnace cooling at 25-50°C/hour (45-90°F/hour) - **Cooling End Point:** Below 550°C (1020°F) before air cooling - **Atmosphere Control:** Neutral or protective to prevent decarburization - **Microstructure Goal:** Coarse pearlite in ferrite matrix for maximum softness ### **H-Steel Specific Considerations:** - **Consistency:** Annealing cycles are tightly controlled to ensure uniform results across all heats - **Certification:** Annealing parameters documented and certified - **Traceability:** Complete thermal history maintained for quality assurance ### **Resulting Microstructure:** - **Primary Phase:** Ferrite matrix with coarse pearlite islands - **Grain Size:** ASTM 5-7 (coarse for maximum machinability) - **Carbide Distribution:** Chromium and molybdenum carbides fully spheroidized - **Hardness Uniformity:** Consistent throughout cross-section due to controlled composition --- ## **3. Physical Properties** | Property | Value | Test Standard | Conditions | |----------|-------|---------------|------------| | **Density** | 7.85 g/cm³ | ASTM E1268 | At 20°C | | **Melting Range** | 1427-1510°C | - | Approximate | | **Modulus of Elasticity** | 205 GPa | ASTM E111 | 20°C | | **Shear Modulus** | 80 GPa | ASTM E143 | 20°C | | **Poisson's Ratio** | 0.29 | ASTM E132 | 20°C | | **Thermal Conductivity** | 42.7 W/m·K | ASTM E1225 | At 100°C | | **Specific Heat Capacity** | 473 J/kg·K | ASTM E1269 | At 20°C | | **Coefficient of Thermal Expansion** | 11.9 × 10⁻⁶/°C | ASTM E228 | 20-100°C | | **Electrical Resistivity** | 0.22 μΩ·m | ASTM B193 | At 20°C | | **Magnetic Properties** | Ferromagnetic | - | Below Curie point | *Note: Physical properties are essentially identical to standard AISI 4130.* --- ## **4. Mechanical Properties (Annealed Condition)** ### **Typical Properties:** | Property | Value Range | Typical Value | Test Standard | |----------|-------------|---------------|---------------| | **Hardness, Brinell** | 140-160 HB | 150 HB | ASTM E10 | | **Hardness, Rockwell B** | 75-83 HRB | 79 HRB | ASTM E18 | | **Tensile Strength** | 500-600 MPa | 550 MPa | ASTM A370 | | **Yield Strength (0.2%)** | 300-370 MPa | 335 MPa | ASTM A370 | | **Elongation (50mm)** | 26-32% | 29% | ASTM A370 | | **Reduction of Area** | 55-65% | 60% | ASTM A370 | | **Modulus of Resilience** | 0.22-0.33 MJ/m³ | 0.27 MJ/m³ | Calculated | ### **Impact Properties:** - **Charpy V-Notch @ 21°C:** 70-100 J (52-74 ft-lb) - **Charpy V-Notch @ -40°C:** 50-70 J (37-52 ft-lb) - **Transition Temperature:** Below -60°C ### **Section Size Consistency (H-Steel Advantage):** | Section Size | Hardness Variation | Tensile Strength Variation | |--------------|-------------------|----------------------------| | **< 25 mm** | ±5 HB | ±20 MPa | | **25-50 mm** | ±7 HB | ±25 MPa | | **50-100 mm** | ±10 HB | ±35 MPa | *Note: H-Steel provides better consistency than standard 4130 in annealed condition.* --- ## **5. Hardenability Characteristics (Certified)** ### **Jominy Hardenability Band:** - **Compliance Standard:** SAE J1268 - **Band Designation:** Specific to customer requirement or standard band - **Test Position:** Typically tested from 1/4 position in bar - **Certification:** Each lot supplied with actual Jominy curve ### **Predicted Hardenability After Final Heat Treatment:** | Quench Medium | Expected Surface Hardness | Through-Hardening Depth | |---------------|---------------------------|-------------------------| | **Water Quench** | 52-55 HRC | Up to 100 mm diameter | | **Oil Quench** | 48-52 HRC | Up to 75 mm diameter | | **Polymer Quench** | 45-50 HRC | Up to 50 mm diameter | *Based on certified Jominy data and Grossmann calculations* --- ## **6. Manufacturing & Processing Characteristics** ### **Machinability:** - **Machinability Rating:** 75% (vs. 100% for B1112 steel) - **Optimal Condition:** Excellent - softest state for this alloy - **Tool Life:** Extended compared to normalized or hardened states - **Surface Finish:** Can achieve 1.6 μm Ra (63 μin) with proper tooling - **Chip Control:** Long, continuous chips - chip breakers recommended ### **Formability:** - **Cold Bending Rating:** Excellent - **Minimum Bend Radius:** 0.5 × thickness for 90° bend - **Deep Drawing:** Suitable for moderate operations - **Stretch Forming:** Excellent - high uniform elongation - **Spinning:** Good for symmetrical shapes ### **Weldability:** - **Weldability Rating:** Excellent (Carbon Equivalent ≈ 0.50%) - **Preheat:** Generally not required for thin sections - **Processes:** All standard processes suitable (SMAW, GTAW, GMAW, SAW) - **Filler Metals:** AWS A5.28 ER80S-D2 or equivalent ### **Subsequent Heat Treatment Response:** This annealed condition provides the **ideal starting point** for: 1. **Normalizing:** 870-900°C, air cool 2. **Quenching & Tempering:** Predictable response due to H-steel control 3. **Carburizing:** Uniform case depth predictable from hardenability data 4. **Stress Relieving:** 595-650°C for dimensional stability --- ## **7. Product Applications** ### **Aerospace Industry:** - **Complex machined components** requiring extensive material removal - **Forging blanks** for critical rotating components - **Sheet metal parts** needing severe forming operations - **Prototype development** where machining performance is critical - **Repair parts** requiring matching of existing components ### **Oil & Gas Equipment:** - **Machined valve bodies** and complex fittings - **Drill collar blanks** before final heat treatment - **Wellhead components** requiring precision machining - **Tool joints** in soft state for machining ### **Automotive & Racing:** - **High-performance transmission components** - **Racing chassis components** requiring complex machining - **Suspension parts** in blank form - **NHRA/FIA certified components** in manufacturing stage ### **Defense Applications:** - **Weapon system components** requiring precision machining - **Armor plate blanks** before final hardening - **Military vehicle components** in manufacturing stage - **Ordnance parts** requiring complex shapes ### **General Manufacturing:** - **Die blocks and molds** in soft state for machining - **Machine tool components** requiring precision - **Gear blanks** before heat treatment - **High-strength fastener blanks** --- ## **8. International Standards & Specifications** ### **Primary Material Standards:** | Standard | Designation | Title | Notes | |----------|-------------|-------|-------| | **SAE International** | SAE J1268 | Hardenability Bands | Primary H-steel standard | | **ASTM International** | ASTM A304 | Alloy Steel Bars, H-Grades | Material specification | | **Aerospace (SAE)** | AMS 6359 | Steel Bars, Alloy | Aerospace H-steel | | **UNS Number** | H41300 | Unified Numbering System | | | **API Specification** | API Spec 7-1 | Drill Collar Specification | Optional H-grade | ### **Global Equivalent Grades:** | Country/Region | Standard | Equivalent Grade | H-Steel Designation | |----------------|----------|------------------|---------------------| | **European Union** | EN 10083-3 | 25CrMo4+H | 1.7218+H | | **Germany** | DIN 17200 | 25CrMo4+H | | | **Japan** | JIS G4052 | SCM430H | Hardenability guaranteed | | **China** | GB/T 5216 | 30CrMoH | | | **United Kingdom** | BS 970 | 708A25+H | | | **International** | ISO 683-18 | 25CrMo4+H | | ### **Heat Treatment Standards:** - **AMS 2759:** Pyrometry for Heat Treatment - **ASTM A991:** Temperature Uniformity Surveys - **NADCAP:** Aerospace heat treatment requirements ### **Testing Standards:** - **SAE J407:** Hardenability Test Methods - **ASTM A255:** Standard End-Quench Test - **ASTM E45:** Assessing Inclusion Content --- ## **9. Quality Assurance** ### **H-Steel Certification Requirements:** 1. **Chemical Analysis:** Complete spectrographic analysis 2. **Jominy Hardenability Test:** Each heat tested and certified 3. **Hardenability Band:** Certified compliance with ordered band 4. **Traceability:** Complete from melt to final product ### **Standard Testing:** - **Hardness Survey:** Multiple points for uniformity verification - **Tensile Testing:** Representative samples - **Microstructure Examination:** Grain size and phase analysis - **Non-Destructive Testing:** As specified (UT, MT, PT) ### **Documentation Provided:** - **Material Test Report:** Chemical and mechanical properties - **Hardenability Certificate:** Actual Jominy curve data - **Heat Treatment Certificate:** Annealing parameters - **Certificates of Compliance:** Against all specified standards --- ## **10. Advantages of AISI 4130H vs. Standard 4130** ### **In Annealed Condition:** | Parameter | 4130H Advantage | Benefit | |-----------|-----------------|---------| | **Property Consistency** | Better lot-to-lot uniformity | Reduced manufacturing variation | | **Machining Predictability** | Consistent tool life and feeds/speeds | Lower machining costs | | **Heat Treatment Results** | Predictable final properties | Reduced heat treatment scrap | | **Design Reliability** | Known hardenability band | Safer design margins | | **Quality Assurance** | Full certification package | Simplified compliance | ### **Cost-Benefit Analysis:** - **Premium:** Typically 15-25% over standard 4130 - **Savings:** Reduced scrap, fewer heat treatment issues, better yield - **ROI:** Positive for production runs > 1000 parts or critical components --- ## **11. Design & Engineering Guidelines** ### **When to Specify 4130H:** 1. **Critical Components:** Where failure is not an option 2. **Production Runs:** Large quantities where consistency matters 3. **Heat Treatment:** When final properties must be predictable 4. **Regulated Industries:** Aerospace, defense, nuclear applications 5. **Cost Optimization:** When total cost of ownership is considered ### **Design Considerations:** - **Final Properties:** Design based on properties after heat treatment - **Machining Allowances:** Include adequate stock for heat treatment distortion - **Testing Requirements:** Specify required certifications upfront - **Supply Chain:** Ensure suppliers understand H-steel requirements ### **Specification Example:** ``` Material: AISI 4130H per ASTM A304 Condition: Annealed at 865°C Hardenability Band: [Specify band, e.g., H1, H2, or actual Jominy limits] Certification: Full MTR with Jominy curve required ``` --- ## **12. Supply Information** ### **Available Forms:** - **Round Bars:** 10-300 mm diameter - **Flat Bars:** Various widths and thicknesses - **Sheets/Plates:** 1-50 mm thickness - **Forgings:** Custom shapes to customer design - **Billets:** For subsequent forging or machining ### **Surface Conditions:** - Hot-rolled, annealed, and descaled - Cold-drawn, annealed, and bright finished - Turned, ground, or polished as specified ### **Lead Times & Quantities:** - **Standard:** 8-12 weeks for certified material - **Minimum Order:** 500 kg for custom hardenability band - **Stock Items:** Some standard sizes and bands available - **Certification:** Additional time for full documentation --- ## **13. Technical Comparison** ### **Annealed 4130H vs. Other Conditions:** | Property | Annealed 4130H | Normalized 4130 | Quenched & Tempered | |----------|----------------|-----------------|---------------------| | **Hardness (HB)** | 140-160 | 180-220 | 250-400+ | | **Tensile (MPa)** | 500-600 | 650-800 | 800-1200+ | | **Machinability** | Excellent | Good | Poor-Fair | | **Formability** | Excellent | Good | Poor | | **Primary Use** | Machining stock | Structural apps | High-strength parts | | **Cost Premium** | 15-25% | 0% | Varies | ### **vs. Competitive Materials:** | Material | Relative Cost | Machinability | Hardenability Control | |----------|---------------|---------------|----------------------| | **4130H Annealed** | 1.0 (baseline) | Excellent | Excellent | | **4340 Annealed** | 1.3 | Good | Good | | **8620 Annealed** | 0.9 | Excellent | Good | | **4140 Annealed** | 1.1 | Good | Good | --- ## **14. Storage & Handling** ### **Best Practices:** - **Storage Environment:** Dry, covered storage preferred - **Stacking:** Proper support to prevent bending - **Identification:** Clear marking of heat numbers and H-band - **Protection:** Light oil coating for long-term storage - **Handling:** Use non-marring equipment and surfaces ### **Shelf Life:** - **Indefinite** if properly stored and protected from corrosion - **Periodic inspection** recommended for long-term storage - **Re-certification** may be required after extended storage --- ## **15. Safety & Environmental** ### **Material Safety:** - **Non-hazardous** in solid form - **Machining Dust:** Use appropriate dust collection - **No special handling** requirements beyond standard steel ### **Environmental Considerations:** - **100% Recyclable** as alloy steel scrap - **Processing Wastes:** Standard metalworking waste streams - **Compliance:** Meets all standard environmental regulations --- ## **16. Technical Support Services** ### **Available Support:** 1. **Material Selection:** Assistance choosing optimal hardenability band 2. **Process Optimization:** Machining and heat treatment recommendations 3. **Failure Analysis:** Metallurgical investigation services 4. **Application Engineering:** Component design assistance ### **Testing Capabilities:** - **Full Metallurgical Laboratory** - **Hardenability Testing** per SAE J1268 - **Non-Destructive Testing** facilities - **Performance Testing** (fatigue, wear, corrosion) --- ## **17. Revision History & References** ### **Document Control:** - **Revision:** 3.0 - **Date:** October 2024 - **Changes:** Updated standards, expanded application guidelines ### **Reference Standards:** - SAE J1268: Hardenability Bands for H-Steels - ASTM A304: Alloy Steel Bars, H-Grades - ASM Handbook, Volume 1: Properties and Selection - Aerospace Structural Metals Handbook --- ## **18. Disclaimer** This technical data sheet provides typical information for AISI 4130H steel in the annealed condition. Actual properties are guaranteed only within the certified hardenability band for each specific heat of material. Key points: 1. **Certification Required:** Always review certified test reports for specific material lots 2. **Testing Recommended:** Conduct application-specific testing for critical applications 3. **Professional Consultation:** Consult with qualified metallurgical engineers The information herein is provided without warranty, and the supplier shall not be liable for any damages arising from its use. Specifications and standards are subject to change. **For guaranteed properties, request and review certified test reports for your specific material lot.** --- **End of Technical Data Sheet** -:- For detailed product information, please contact sales. -: AISI 4130H Steel, annealed at 865°C (1590°F) Specification Dimensions Size： Diameter 20-1000 mm Length <6199 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 4130H Steel, annealed at 865°C (1590°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4130H Steel, annealed at 865°C (1590°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4130H Steel, annealed at 865°C (1590°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 4130H Steel, annealed at 865°C (1590°F) -:- 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 2670 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