AISI 5115/SAE 5115 Low Alloy Steel Foil/Strip

AISI 5115/SAE 5115 Low Alloy Steel Foil, Cold Drawn Bar Product Information -:- For detailed product information, please contact sales. -: AISI 5115/SAE 5115 Low Alloy Steel Foil, Cold Drawn Bar Synonyms -:- For detailed product information, please contact sales. -:

AISI 5115/SAE 5115 Low Alloy Steel, Cold Drawn Bar Product Information -:- For detailed product information, please contact sales. -: # **AISI 5115/SAE 5115 Low Alloy Steel (Cold Drawn Bar)** ## **1. Product Overview** **AISI/SAE 5115** is a low-carbon, chromium-case hardening steel specifically designed for **carburizing or carbonitriding** heat treatments. When supplied as **cold drawn bars**, this material offers improved dimensional accuracy, superior surface finish, and enhanced mechanical properties in the as-drawn condition, making it ideal for high-precision components that undergo subsequent case hardening. The steel contains approximately **0.7-1.0% chromium**, which provides good hardenability of the case after carburizing while maintaining a relatively tough and ductile core. The cold drawing process induces strain hardening, resulting in higher tensile strength and yield strength compared to hot-rolled products, with typical surface finishes of 63-125 µin Ra (1.6-3.2 µm Ra). --- ## **2. Chemical Composition (SAE J404/J412)** | Element | Composition Range (%) | Function & Effect | |---------|----------------------|-------------------| | **Carbon (C)** | 0.13 - 0.18 | Provides core strength; low carbon ensures good core toughness after case hardening | | **Manganese (Mn)** | 0.70 - 0.90 | Improves hardenability and strength; aids in deoxidation | | **Phosphorus (P)** | ≤ 0.035 | Residual element; minimized for improved toughness | | **Sulfur (S)** | ≤ 0.040 | Residual element; typically kept low for better transverse properties | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer; strengthens ferrite matrix | | **Chromium (Cr)** | 0.70 - 0.90 | **Key alloying element**; enhances case hardenability and wear resistance | | **Nickel (Ni)** | - | Not intentionally added | | **Molybdenum (Mo)** | - | Not intentionally added | | **Iron (Fe)** | Balance | Base metal | **Material Designation:** - **SAE/AISI:** 5115 - **UNS:** G51150 - **Cold Drawn Condition:** CD (Commercial Drawn), SHTCD (Stress Relieved & Cold Drawn), or as specified --- ## **3. Physical & Mechanical Properties** ### **Cold Drawn Condition (As-Drawn):** - **Surface Finish:** 63-125 µin Ra (1.6-3.2 µm Ra) - **Dimensional Tolerance:** ASTM A108 Grade 1018 cold drawn tolerances - **Straightness:** Typically 0.060" per foot maximum - **Hardness:** 187-229 HB (Brinell) / 88-97 HRB - **Tensile Strength:** 620-795 MPa (90-115 ksi) - **Yield Strength:** 515-690 MPa (75-100 ksi) - *Significantly higher than hot-rolled* - **Elongation (in 2"):** 12-18% - **Reduction of Area:** 35-50% - **Machinability:** 60-65% (relative to 1212 steel = 100%) ### **After Case Hardening (Typical Results):** *Carburizing Cycle:* - **Temperature:** 900-925°C (1650-1700°F) - **Case Depth:** 0.5-2.0 mm (0.020-0.080") as specified - **Quenching:** Oil quench from 815-845°C (1500-1550°F) - **Tempering:** 150-200°C (300-400°F) **Resultant Properties:** - **Surface Hardness:** 58-63 HRC - **Effective Case Depth (550 HV):** 0.5-1.5 mm - **Core Hardness:** 25-40 HRC (depends on section size) - **Core Tensile Strength:** 860-1100 MPa - **Core Toughness:** Good impact resistance ### **Physical Constants:** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **Melting Point:** 1480-1530°C (2695-2785°F) - **Modulus of Elasticity:** 205 GPa (29,700 ksi) - **Poisson's Ratio:** 0.29 - **Thermal Conductivity:** 46.6 W/m·K at 100°C - **Coefficient of Thermal Expansion:** 11.5 µm/m·°C (20-100°C) --- ## **4. Product Applications** **Cold drawn 5115 bars are extensively used for precision components requiring:** ### **Automotive Industry:** - **Gears:** Transmission gears, differential gears, timing gears - **Shafts:** Camshafts, small crankshafts, transmission shafts - **Bearings:** Needle bearing races, roller bearing races - **Fasteners:** High-strength bolts, studs, special fasteners - **Other:** Valve components, steering parts, splined shafts ### **Industrial Machinery:** - **Gear components** for power transmission equipment - **Bushings and bearings** for rotating equipment - **Pins and shafts** requiring wear resistance - **Hydraulic components** with wear surfaces - **Machine tool parts** requiring precision and wear resistance ### **Agricultural Equipment:** - **Transmission gears** for tractors and harvesters - **Implement drive components** - **PTO shaft components** ### **Consumer Products:** - **Power tool components** (gears, shafts) - **Appliance parts** requiring wear resistance - **Bicycle and motorcycle components** --- ## **5. International Standards & Equivalents** ### **Primary Standards:** | Standard | Designation | Specification | |----------|-------------|---------------| | **SAE/AISI** | **5115** | SAE J404, J412 | | **ASTM** | **5115** | A304, A322 (Bars) | | **UNS** | **G51150** | Unified Numbering System | | **ASTM (Cold Drawn)** | **A108** | Standard for Cold Finished Bars | ### **International Equivalent Grades:** | Country/Region | Standard | Equivalent Grade | Notes | |----------------|----------|-----------------|-------| | **Germany** | DIN 17210 | **16Cr3** | Close equivalent | | **Europe (EN)** | EN 10084 | **16Cr4** | Case hardening steel | | **Japan** | JIS G4105 | **SCr415** | Similar properties | | **China** | GB/T 5216 | **15Cr** | Chinese equivalent | | **International** | ISO 683-11 | **16Cr4** | Type 1.7016 | ### **Cold Drawn Bar Standards:** - **ASTM A108:** Standard for Steel Bars, Carbon, Cold-Finished - **SAE J1397:** Steel Bars, Alloy, Hot-Wrought and Cold-Finished - **DIN EN 10278:** Bright steel products - Dimensions and tolerances - **ISO 286-2:** ISO system of limits and fits --- ## **6. Manufacturing & Processing Guidelines** ### **Cold Drawing Process:** 1. **Starting Material:** Hot-rolled bars normalized or annealed 2. **Pre-treatment:** Pickling to remove scale 3. **Drawing:** Single or multiple passes through dies 4. **Optional Stress Relieving:** 550-650°C to relieve drawing stresses 5. **Final Sizing:** Straightening and cutting to length ### **Machinability (Cold Drawn Condition):** - **Cutting Speed:** 70-85 SFPM for turning operations - **Feed Rate:** Moderate - **Tool Material:** HSS or carbide recommended - **Coolant:** Required for optimum results - **Chip Formation:** Continuous chips; chip breakers recommended ### **Heat Treatment for Case Hardening:** 1. **Carburizing/Carbonitriding:** 900-925°C in carburizing atmosphere 2. **Diffusion (Optional):** Reduce temperature to equalize carbon gradient 3. **Quenching:** Oil quench from 815-845°C 4. **Sub-zero Treatment (Optional):** For maximum dimensional stability 5. **Tempering:** 150-200°C for 1-2 hours 6. **Final Grinding/Honing:** As required for precision applications ### **Welding Considerations:** - **Weldability:** Fair (pre-heat 150-200°C recommended) - **Processes:** GTAW, GMAW with low-hydrogen electrodes - **Post-weld:** Full anneal or re-heat treat if carburized area affected - **Limitations:** Avoid welding after case hardening --- ## **7. Quality & Inspection** ### **Standard Testing:** - **Chemical Analysis:** Per ASTM A751 - **Hardness Testing:** Brinell or Rockwell per ASTM E10/E18 - **Tensile Testing:** Per ASTM A370 - **Surface Inspection:** Visual and dimensional checks - **Microcleanliness:** Per ASTM E45 (if specified) ### **Cold Drawn Bar Specifics:** - **Dimensional Tolerance:** Typically ASTM A108 Table 7 - **Straightness:** 0.060"/ft maximum for commercial quality - **Surface Defects:** Free from seams, laps, and excessive drawing marks - **Decarburization:** Maximum 0.003" total decarb per side ### **Certifications:** - **Mill Test Certificate:** 2.2 or 3.1 per EN 10204 - **Material Traceability:** Full heat/lot traceability - **Compliance Certificates:** As required by specification --- ## **8. Advantages of Cold Drawn 5115 vs. Hot-Rolled** | Property | Cold Drawn 5115 | Hot-Rolled 5115 | |----------|----------------|-----------------| | **Surface Finish** | 63-125 µin Ra | 250-500 µin Ra | | **Dimensional Accuracy** | ±0.002-0.005"/inch | ±0.010-0.020"/inch | | **Yield Strength** | 75-100 ksi | 55-70 ksi | | **Straightness** | 0.060"/ft max | 0.125"/ft typical | | **Machining Time** | Reduced | Standard | | **Material Cost** | 15-30% higher | Baseline | | **Scrap Rate** | Lower | Higher | --- ## **9. Design Considerations** ### **Optimal Applications:** - Components requiring **minimal machining** before heat treatment - **High-volume production** where material consistency is critical - Applications needing **improved fatigue strength** from better surface finish - **Precision components** with tight dimensional tolerances ### **Limitations:** - **Size Limitations:** Typically available up to 4" diameter - **Residual Stresses:** May require stress relieving for critical applications - **Anisotropic Properties:** Mechanical properties vary with direction - **Cost Premium:** Higher than hot-rolled material ### **Section Size Guidelines:** - **Optimum Carburizing:** 10-50 mm diameter sections - **Maximum Effective Case:** ~1/6 of section thickness - **Minimum Wall Thickness:** 2× case depth + core requirement --- ## **10. Technical Comparison with Similar Grades** | Grade | C Range | Cr Range | Typical Use | Relative Cost | |-------|---------|----------|-------------|---------------| | **5115** | 0.13-0.18 | 0.70-0.90 | General case hardening | 1.0 | | **5120** | 0.17-0.22 | 0.70-0.90 | Higher core strength | 1.0 | | **4118** | 0.18-0.23 | 0.40-0.60 | Moderate hardenability | 0.9 | | **8620** | 0.18-0.23 | 0.40-0.60 | Nickel-chromium-molybdenum | 1.2 | --- ## **11. Storage & Handling** ### **Storage Conditions:** - **Indoor Storage:** Preferred to prevent rust - **Protection:** Oiled or coated surface if long-term storage - **Stacking:** Flat and supported to prevent bending - **Identification:** Maintain heat/lot identification ### **Rust Prevention:** - **Temporary:** Oil film or VCI paper wrapping - **Permanent:** Phosphate coating or plating after machining - **Cleaning:** Degreasing before heat treatment --- **Revision:** 1.2 **Date:** October 2023 **Disclaimer:** This technical information is for reference only. Actual properties may vary based on manufacturer, processing, and specific conditions. Always consult with material suppliers and conduct appropriate testing for critical applications. Cold drawing processes and resulting properties may vary between producers. -:- For detailed product information, please contact sales. -: AISI 5115/SAE 5115 Low Alloy Steel, Cold Drawn Bar Specification Dimensions Size： Diameter 20-1000 mm Length <4106 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 5115/SAE 5115 Low Alloy Steel, Cold Drawn Bar Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 5115/SAE 5115 Low Alloy Steel Foil, Cold Drawn Bar -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 5115/SAE 5115 Low Alloy Steel Foil, Cold Drawn Bar -:- For detailed product information, please contact sales. -:

Packing of AISI 5115/SAE 5115 Low Alloy Steel Foil/Strip, Cold Drawn Bar -:- 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 577 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