AISI 50B60 Steel Capillary

AISI 50B60 Steel Capillary Product Information -:- For detailed product information, please contact sales. -: AISI 50B60 Steel Capillary Synonyms -:- For detailed product information, please contact sales. -:

AISI 50B60 Steel Product Information -:- For detailed product information, please contact sales. -: # **AISI 50B60 Boron-Treated Steel Technical Data Sheet** ## **1. Product Overview** **AISI 50B60** is a medium-high carbon, boron-treated alloy steel designed to provide **enhanced hardenability** at relatively low alloy cost. The addition of small amounts of boron (typically 0.0005-0.003%) significantly improves the steel's ability to form martensite during heat treatment, making it suitable for components requiring high strength and wear resistance in larger cross-sections. This grade represents an **economical alternative** to more expensive chromium-molybdenum or nickel-chromium steels for many applications where maximum hardenability is required. The sulfur content is controlled to improve machinability in the annealed condition while maintaining good mechanical properties. --- ## **2. Chemical Composition (SAE J404/J412)** | Element | Composition Range (%) | Specification Limits | Notes | |---------|----------------------|---------------------|-------| | **Carbon (C)** | 0.56 - 0.64 | SAE J404 | Primary strengthening element | | **Manganese (Mn)** | 0.75 - 1.00 | SAE J404 | Enhances hardenability and strength | | **Phosphorus (P)** | ≤ 0.035 | SAE J404 | Residual element (minimized) | | **Sulfur (S)** | 0.040 - 0.070 | SAE J404 | Improves machinability | | **Silicon (Si)** | 0.15 - 0.35 | SAE J404 | Deoxidizer, strengthens ferrite | | **Boron (B)** | 0.0005 - 0.003 | SAE J404 | Critical for hardenability enhancement | | **Iron (Fe)** | Balance | - | Base metal | **Key Characteristics:** - **Boron effectiveness**: Approximately 0.001% boron provides hardenability equivalent to 0.5% chromium - **Carbon content**: Higher than 50B50/50B46 grades for increased hardness potential - **Sulfur control**: Optimized for machinability without compromising transverse properties excessively --- ## **3. Physical & Mechanical Properties** ### **As-Supplied Condition (Annealed/Normalized):** - **Hardness**: 190-220 BHN - **Tensile Strength**: 650-750 MPa - **Yield Strength**: 400-450 MPa - **Elongation**: 18-22% (in 50 mm) - **Reduction of Area**: 40-50% - **Machinability**: 60-70% (relative to 1212 steel as 100%) ### **Heat Treatment Response:** *Typical Heat Treatment Cycle:* - **Austenitizing**: 830-850°C (1525-1560°F) - **Quenching Medium**: Oil (preferred) - **Tempering Range**: 200-600°C (400-1110°F) **Hardened & Tempered Properties:** | Tempering Temperature | Hardness (HRC) | Tensile Strength (MPa) | Yield Strength (MPa) | Impact Energy (J) | |----------------------|----------------|------------------------|----------------------|-------------------| | As-quenched | 62-66 | - | - | 10-15 | | 200°C (400°F) | 58-62 | 1950-2100 | 1650-1800 | 15-25 | | 400°C (750°F) | 48-52 | 1500-1650 | 1350-1500 | 30-40 | | 550°C (1020°F) | 38-42 | 1150-1250 | 1000-1100 | 45-55 | **Hardenability Data:** - **Critical Diameter (oil quench)**: 50-65 mm - **Jominy End-Quench**: Shows excellent hardenability to at least J20 position --- ## **4. Product Applications** ### **Primary Application Areas:** **Automotive Components:** - **Heavy-duty axle shafts** for trucks and buses - **Steering components**: Steering arms, pitman arms, drag links - **Transmission parts**: Gears, shafts, synchronizer hubs - **Suspension components**: Torsion bars, heavy-duty springs - **Engine components**: Crankshafts (secondary), camshafts **Industrial Machinery:** - **Gears and pinions** for industrial gearboxes - **Heavy-duty shafts** and spindles - **Forged components**: Connecting rods, levers, yokes - **Hydraulic components**: Piston rods, cylinder barrels **Agricultural Equipment:** - **Tractor components**: PTO shafts, transmission gears - **Implement parts**: Plow beams, cultivator frames - **Harvester components**: Drive shafts, gear elements **Construction & Mining:** - **Earthmoving equipment**: Track links, roller bushings - **Drilling equipment**: Drill rods, stabilizers - **Crane components**: Boom sections, sheave pins **Hand Tools & Hardware:** - **Heavy-duty wrenches** and sockets - **Industrial cutting tools** (non-high-speed applications) - **High-strength fasteners** (Grade 12.9 equivalent) --- ## **5. International Standards & Equivalents** ### **Primary Specifications:** | Standard Organization | Designation | Specification Document | |----------------------|-------------|------------------------| | **SAE/AISI (USA)** | **50B60** | SAE J404, J412 | | **ASTM** | - | A304 (if H-grade) | | **UNS** | G50601 | - | ### **International Equivalent Grades:** | Country/Region | Standard | Grade Designation | Comparison Notes | |----------------|----------|-------------------|------------------| | **Germany** | DIN 17211 | **50B60** | Direct equivalent | | **Europe (EN)** | EN 10083-3 | **1.5534** | Similar composition | | **Japan** | JIS G4052 | **SB56** | Similar properties | | **China** | GB/T 5216 | **60MnB** | Close equivalent | | **International** | ISO 683-1 | **Type 1.5534** | International equivalent | ### **Hardenability Variant:** - **AISI 50B60H**: Same chemistry with guaranteed hardenability bands per SAE J1268 ### **Related Standards for Processing:** - **Heat Treatment**: AMS 2759, ASTM A29 - **Forging**: ASTM A788 - **Bars**: ASTM A322, A304 --- ## **6. Manufacturing & Processing Guidelines** ### **Hot Working:** - **Forging Temperature**: 1150-900°C (2100-1650°F) - **Hot Rolling**: 1100-850°C (2010-1560°F) - **Annealing after Hot Work**: 650-700°C (1200-1290°F), slow cool ### **Heat Treatment Recommendations:** **1. Full Annealing:** - Temperature: 790-820°C (1450-1510°F) - Cooling: Furnace cool to 550°C (1020°F), then air cool - Resultant hardness: 190-220 BHN **2. Normalizing:** - Temperature: 870-900°C (1600-1650°F) - Cooling: Still air - Purpose: Refine grain structure before hardening **3. Hardening:** - Austenitizing: 830-850°C (1525-1560°F), soak 20-30 min/inch - Quenching: Agitated oil (martempering oil for complex shapes) - Caution: Avoid water quenching due to cracking risk **4. Tempering:** - Temperature: Based on desired hardness - Time: Minimum 1 hour per inch of thickness - Cooling: Air cool (rapid cool through 350-550°C range to avoid temper embrittlement) ### **Machining:** - **Best Condition**: Annealed state - **Cutting Speed**: 60-75% of 1212 steel - **Feed Rate**: Moderate - **Tool Material**: Carbide recommended for production runs - **Coolant**: Required for heavy cuts ### **Welding:** - **Weldability**: Poor - not recommended for welded structures - **If welding is necessary**: - Pre-heat: 200-300°C (400-570°F) - Post-weld heat treatment: Full anneal or re-harden - Filler metal: Low-hydrogen electrodes - Process: SMAW or GTAW preferred --- ## **7. Quality & Inspection Standards** ### **Standard Tests:** - Chemical analysis per ASTM A751 - Hardness testing per ASTM E18 - Tensile testing per ASTM A370 - Macroetch testing per ASTM E340 - Hardenability testing (Jominy) per SAE J1268 (for H-grades) ### **Non-Destructive Testing:** - Magnetic particle inspection per ASTM E1444 - Ultrasonic testing per ASTM A388 - Dye penetrant inspection per ASTM E165 ### **Certification:** - Mill test certificate 2.2 or 3.1 per EN 10204 - Traceability to heat/lot number - Compliance certificates as specified --- ## **8. Advantages & Technical Considerations** ### **Advantages:** 1. **Cost-Effective**: Lower alloy cost than equivalent Cr-Mo or Ni-Cr steels 2. **High Hardenability**: Suitable for larger sections 3. **Good Machinability**: In annealed condition due to controlled sulfur 4. **Excellent Strength**: After proper heat treatment 5. **Good Fatigue Resistance**: When properly processed ### **Limitations & Considerations:** 1. **Temper Embrittlement**: Susceptible between 250-400°C tempering range 2. **Weldability**: Poor - requires special precautions 3. **Decarburization**: Sensitive during heat treatment; protective atmosphere recommended 4. **Boron Segregation**: Possible in large sections; affects hardenability uniformity 5. **Transverse Properties**: May be reduced compared to boron-free grades ### **Design Considerations:** - **Section Size**: Maximum effective hardening depth ~75 mm in oil quench - **Notch Sensitivity**: Moderate; proper fillets and surface finish important - **Surface Treatments**: Suitable for induction hardening, carburizing not typically used - **Corrosion Resistance**: Limited; requires protective coatings in corrosive environments --- ## **9. Environmental & Safety Information** ### **Material Safety:** - **MSDS Classification**: Generally not hazardous in solid form - **Dust/Fumes**: Machining produces dust/fumes requiring proper ventilation - **Fire Hazard**: Not flammable but hot material requires handling precautions ### **Environmental Impact:** - **Recyclability**: 100% recyclable as ferrous scrap - **RoHS/REACH**: Compliant with current regulations - **Disposal**: Dispose as non-hazardous metal scrap ### **Processing Safety:** - Heat treatment requires proper furnace safety procedures - Quenching oils require fire prevention measures - Machining requires standard machine shop safety protocols --- ## **10. Technical Comparison with Similar Grades** | Property | 50B60 | 5160 (Cr steel) | 1060 (C steel) | 4140 (Cr-Mo) | |----------|-------|-----------------|----------------|--------------| | **Hardenability** | Very High | High | Medium | Very High | | **Cost Factor** | 1.0 | 1.2 | 0.8 | 1.5 | | **Machinability** | Good | Fair | Good | Fair | | **Toughness** | Good | Very Good | Good | Excellent | | **Typical Use** | Shafts, gears | Springs, shafts | Springs, blades | Critical components | --- **Revision**: 1.0 **Date**: October 2023 **Disclaimer**: This technical data is for informational purposes only. Actual properties may vary depending on manufacturer, processing history, and heat treatment. Always consult with material suppliers and conduct appropriate testing for critical applications. Specifications are subject to change without notice. -:- For detailed product information, please contact sales. -: AISI 50B60 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4104 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 50B60 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 50B60 Steel Capillary -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 50B60 Steel Capillary -:- For detailed product information, please contact sales. -:

Packing of AISI 50B60 Steel Capillary -:- 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 Capillary 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 575 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