AISI 5117 Steel Seamless tube,UNS G51170

AISI 5117 Steel Seamless tube Composition Spec (UNS G51170) Product Information -:- For detailed product information, please contact sales. -: AISI 5117 Steel Seamless tube Composition Spec (UNS G51170) Synonyms -:- For detailed product information, please contact sales. -:

AISI 5117 Steel Composition Spec (UNS G51170) Product Information -:- For detailed product information, please contact sales. -: # **AISI 5117 / UNS G51170 Low Carbon Chromium Steel - Technical Specification** ## **1. Product Overview** **AISI 5117 (UNS G51170)** is a low-carbon chromium alloy steel primarily designed for **case hardening applications** through carburizing or carbonitriding processes. Characterized by its balanced composition of approximately 0.15-0.20% carbon and 0.70-0.90% chromium, this steel offers an optimal combination of core toughness and case hardenability. The chromium content enhances the hardenability of the carburized case while maintaining good ductility in the core, making it suitable for components requiring wear-resistant surfaces with impact-resistant cores. This steel is typically supplied in the hot-rolled, cold-drawn, or annealed condition and is intended for subsequent heat treatment by the end-user. Its consistent response to case hardening and good machinability in the as-supplied state make it a reliable choice for medium-duty automotive and industrial components. --- ## **2. Chemical Composition (SAE J404/J412)** | Element | Composition Range (%) | Specification Limits | Metallurgical Function | |---------|----------------------|----------------------|------------------------| | **Carbon (C)** | 0.15 - 0.20 | SAE J404 | Provides core strength; optimal balance for case/core properties | | **Manganese (Mn)** | 0.70 - 0.90 | SAE J404 | Enhances hardenability, improves strength, refines grain structure | | **Phosphorus (P)** | ≤ 0.035 | SAE J404 | Residual impurity; minimized for improved toughness | | **Sulfur (S)** | ≤ 0.040 | SAE J404 | Residual element; typically low for uniform properties | | **Silicon (Si)** | 0.15 - 0.35 | SAE J404 | Deoxidizer; provides solid solution strengthening | | **Chromium (Cr)** | 0.70 - 0.90 | SAE J404 | **Primary alloying element**; forms carbides in case, improves wear resistance and hardenability | | **Iron (Fe)** | Balance | - | Base matrix | **Material Designations:** - **SAE/AISI:** 5117 - **UNS:** G51170 - **Common Conditions:** Annealed, Hot Rolled, Cold Drawn, Normalized --- ## **3. Physical & Mechanical Properties** ### **As-Supplied Conditions:** **Hot-Rolled (Typical):** - **Hardness:** 170-212 HB (Brinell) - **Tensile Strength:** 540-690 MPa (78-100 ksi) - **Yield Strength:** 385-515 MPa (56-75 ksi) - **Elongation (in 2"):** 20-28% - **Reduction of Area:** 45-55% **Annealed (Optimal for Machining):** - **Hardness:** 156-197 HB - **Machinability Rating:** 55-60% (relative to 1212 steel = 100%) **Cold Drawn (Improved Precision):** - **Hardness:** 183-229 HB - **Tensile Strength:** 585-760 MPa (85-110 ksi) - **Yield Strength:** 485-655 MPa (70-95 ksi) - **Surface Finish:** 63-125 μin Ra - **Improved Dimensional Accuracy** ### **After Case Hardening (Typical):** *Standard Carburizing Process:* - **Temperature:** 900-925°C (1650-1700°F) - **Carbon Potential:** 0.80-0.95% - **Quench:** Oil, 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):** 0.5-2.0 mm (adjustable) - **Core Hardness:** 28-40 HRC (depends on section size) - **Core Tensile Strength:** 900-1150 MPa - **Core Toughness (Charpy V):** 35-65 J ### **Physical Constants:** - **Density:** 7.85 g/cm³ (0.284 lb/in³) - **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:** 11.5-12.5 μm/m·°C (20-400°C) - **Melting Range:** 1480-1520°C (2695-2765°F) --- ## **4. Product Applications** ### **Automotive Components:** - **Transmission Parts:** Gears, synchronizer hubs, shift forks - **Steering Components:** Steering arm balls, linkage parts - **Engine Components:** Valve train parts, cam followers, tappets - **Drivetrain:** Universal joint components, drive shaft yokes - **Fasteners:** High-strength bolts, studs (after carbonitriding) ### **Industrial Machinery:** - **Gear Components:** Small to medium-sized gears, pinions - **Bearing Elements:** Bearing races, rollers (medium duty) - **Hydraulic Components:** Pump gears, valve parts - **Agricultural Equipment:** Implement gears, drive components - **Material Handling:** Conveyor system components, rollers ### **Consumer & Specialty Products:** - **Power Tool Components:** Gear elements, drive shafts - **Appliance Parts:** Timer mechanisms, drive gears - **Hardware Components:** High-wear pins, bushings - **Recreational Equipment:** Bicycle components, exercise machine parts ### **Typical Case Depth Applications:** - **Shallow Case (0.25-0.75 mm):** Fasteners, small pins, light-duty gears - **Medium Case (0.75-1.5 mm):** Automotive gears, bearing components - **Deep Case (1.5-2.0 mm):** Heavy-duty gears, high-load components --- ## **5. International Standards & Equivalent Grades** ### **Primary Specifications:** | Standard Organization | Designation | Specification Document | |----------------------|-------------|------------------------| | **SAE/AISI (USA)** | **5117** | SAE J404, J412 | | **ASTM** | - | A322 (Alloy Steel Bars) | | **UNS** | **G51170** | Unified Numbering System | ### **Global Equivalent Grades:** | Country/Region | Standard | Equivalent Grade | Notes | |----------------|----------|-----------------|-------| | **Germany** | DIN 17210 | **17Cr3** | Close equivalent | | **Europe (EN)** | EN 10084 | **17Cr4** | Designation 1.7017 | | **Japan** | JIS G4105 | **SCr417** | Similar composition | | **China** | GB/T 5216 | **17Cr** | Chinese standard | | **International** | ISO 683-11 | **17Cr4** | Type 1.7017 | | **France** | NF A35-552 | **17C3** | French equivalent | ### **Related Processing Standards:** - **ASTM A534:** Carburizing Steels - **AMS 2300:** Steel Cleanliness (Aircraft Quality) - **ISO 2639:** Determination of Effective Case Depth - **SAE J423:** Methods of Measuring Case Depth --- ## **6. Manufacturing & Processing Characteristics** ### **Machinability:** - **As-Annealed Condition:** Good machinability - **Cutting Speed:** 60-75 SFPM for turning operations - **Tool Material:** HSS or carbide recommended - **Chip Formation:** Continuous chips; chip breakers beneficial - **Surface Finish:** Good with proper tool geometry and coolant ### **Forming & Fabrication:** - **Cold Forming:** Fair capability in annealed condition - **Hot Forming:** Excellent at 1100-900°C (2010-1650°F) - **Welding:** Fair weldability with precautions - Pre-heat: 150-200°C recommended - Process: GTAW or GMAW with low-hydrogen electrodes - Post-weld: Stress relief or full heat treatment required if carburized ### **Optimal Heat Treatment Sequence:** 1. **Initial Condition:** Annealed or normalized for machining 2. **Rough Machining:** Leave 0.2-0.5 mm stock for distortion 3. **Carburizing:** 900-925°C with controlled atmosphere 4. **Quenching:** Oil quench from 820-840°C 5. **Tempering:** 180°C for 2 hours minimum 6. **Finish Machining:** Grinding, honing as required 7. **Final Surface Treatment:** Shot peening, coating if needed ### **Distortion Control:** - Normalize or stress relieve before machining - Use fixtures during quenching - Consider carbonitriding for lower temperature process - Design symmetrical parts where possible --- ## **7. Quality Control & Inspection** ### **Standard Testing Methods:** 1. **Chemical Analysis:** - Spectrochemical analysis per ASTM A751 - Wet chemical methods for certification 2. **Mechanical Testing:** - Tensile testing per ASTM A370 - Hardness testing (Brinell, Rockwell) per ASTM E10/E18 3. **Case Hardening Evaluation:** - Microhardness traverse per ISO 2639 - Effective case depth at 550 HV (50 HRC) - Microstructure examination per ASTM E112 (grain size) 4. **Non-Destructive Testing:** - Magnetic particle inspection per ASTM E1444 - Ultrasonic testing for internal defects if specified ### **Typical Quality Requirements:** - **Grain Size:** ASTM 5-8 (fine grain preferred) - **Decarburization:** ≤ 0.25 mm total per side (as-supplied) - **Surface Quality:** Free from seams, laps, and excessive scale - **Cleanliness:** Controlled inclusion content per specified grade --- ## **8. Design Considerations** ### **Optimal Application Parameters:** - **Section Size:** 10-75 mm diameter optimal for case hardening - **Case/Depth Ratio:** Case depth typically 10-20% of radius - **Loading Conditions:** Suitable for medium to high contact stresses - **Service Temperature:** Up to 200°C (400°F) continuous ### **Advantages of 5117:** ✅ **Consistent response** to case hardening processes ✅ **Good balance** of core toughness and case hardness ✅ **Cost-effective** compared to nickel-alloyed grades ✅ **Good machinability** in annealed condition ✅ **Widely available** in various forms and sizes ✅ **Predictable distortion** characteristics ### **Limitations:** ⚠️ **Not suitable** for extremely heavy impact loading ⚠️ **Limited depth** of hardening compared to higher-alloy steels ⚠️ **Weldability** requires special procedures ⚠️ **Corrosion resistance** limited without coatings ⚠️ **Not recommended** for through-hardening applications ### **Comparison with Similar Grades:** | Property | 5117 | 5120 | 8620 | 1020 | |----------|------|------|------|------| | **Carbon Range** | 0.15-0.20 | 0.17-0.22 | 0.18-0.23 | 0.18-0.23 | | **Chromium Content** | 0.70-0.90 | 0.70-0.90 | 0.40-0.60 | - | | **Case Hardenability** | Good | Very Good | Excellent | Poor | | **Core Toughness** | Good | Good | Excellent | Excellent | | **Relative Cost** | 1.0 | 1.05 | 1.2 | 0.7 | --- ## **9. Technical Performance Data** ### **Fatigue Properties (Case Hardened):** - **Rotating Bending Fatigue Limit:** 400-550 MPa - **Contact Fatigue Resistance:** Good to very good - **Fatigue Life Improvement:** 30-50% over through-hardened at same hardness ### **Wear Characteristics:** - **Abrasive Wear Resistance:** Excellent (58-63 HRC surface) - **Adhesive Wear:** Good with proper lubrication - **Galling Resistance:** Fair to good - **Break-in Characteristics:** Good with proper surface finish ### **Dimensional Stability:** - **Growth during Carburizing:** 0.05-0.15% typical - **Distortion during Quench:** Controllable with proper fixturing - **Stability after Tempering:** Good for most applications --- ## **10. Environmental & Safety Considerations** ### **Material Safety:** - **MSDS Classification:** Not hazardous in solid form - **Dust/Fumes:** Machining requires standard ventilation - **Heat Treatment:** Standard furnace safety procedures apply ### **Environmental Impact:** - **Recyclability:** 100% recyclable as ferrous scrap - **RoHS/REACH Compliant:** Contains no restricted substances - **Processing:** Standard steel manufacturing environmental controls ### **Sustainability Factors:** - Long service life reduces replacement frequency - Energy efficient compared to some high-alloy alternatives - Compatible with modern, efficient heat treatment processes --- ## **11. Storage & Handling Guidelines** ### **Material Storage:** - **Indoor Storage:** Recommended to prevent rust - **Protection:** Oil coating or VCI paper for long-term storage - **Identification:** Maintain heat/lot traceability - **Handling:** Standard steel handling procedures ### **Rust Prevention:** - **Temporary:** Oil film, rust preventatives - **Permanent:** Phosphate coating, plating, painting - **Cleaning:** Degrease before heat treatment --- **Technical Note:** AISI 5117 represents an optimal balance for many case hardening applications where the higher carbon of 5120 is not required but better hardenability than 5115 is desired. Its consistent performance and predictable behavior make it a reliable choice for quality-conscious manufacturers. **Revision:** 1.0 **Date:** October 2023 **Disclaimer:** This technical information is for reference purposes. Actual properties may vary based on manufacturer, processing history, and specific heat treatment parameters. Always consult with material suppliers and conduct application-specific testing for critical components. Case hardening results are highly dependent on process control and equipment capabilities. -:- For detailed product information, please contact sales. -: AISI 5117 Steel Composition Spec (UNS G51170) Specification Dimensions Size： Diameter 20-1000 mm Length <4108 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 5117 Steel Composition Spec (UNS G51170) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 5117 Steel Seamless tube Composition Spec (UNS G51170) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 5117 Steel Seamless tube Composition Spec (UNS G51170) -:- For detailed product information, please contact sales. -:

Packing of AISI 5117 Steel Seamless tube Composition Spec (UNS G51170) -:- 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 Seamless tube 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 579 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