AISI 4815 Steel Tube,Pipe

AISI 4815 Steel Tube, pseudocarburized Product Information -:- For detailed product information, please contact sales. -: AISI 4815 Steel Tube, pseudocarburized Synonyms -:- For detailed product information, please contact sales. -:

AISI 4815 Steel, pseudocarburized Product Information -:- For detailed product information, please contact sales. -: # Technical Data Sheet: AISI 4815 Steel – Pseudocarburized Condition ## 1. Product Overview **AISI 4815** steel in the **pseudocarburized condition** represents a specialized material state designed for engineering development and process validation of carburized components. This nickel-molybdenum alloy steel has undergone a complete thermal simulation of the carburizing heat treatment cycle—including time at carburizing temperature—but within a neutral atmosphere that prevents actual carbon absorption. The resulting material possesses the **exact core microstructure, mechanical properties, and dimensional characteristics** that would be present in the core of a fully carburized part, but without the hardened case. This condition is essential for prototyping, machining trials, distortion analysis, and core property verification before committing to actual production carburizing of high-value components. ## 2. Material Specifications & Standards * **UNS Designation:** G48150 * **AISI/SAE:** 4815 * **Primary Material Standards:** * **SAE J404:** Chemical Compositions of SAE Alloy Steels * **ASTM A322:** Standard Specification for Steel Bars, Alloy, Standard Grades * **Heat Treatment Reference Standards:** * **AMS 2759/7:** Carburizing and Carbonitriding (Aerospace) * **SAE J1268:** Heat Treatment of Steel * **ISO 2639:** Determination of Case Hardening Depth * **International Equivalents:** * **EN/DIN:** 15NiMo7 (1.6565) * **JIS:** SNCM415 * **GB:** 15NiMo (China) ## 3. Chemical Composition (SAE J404 Standard) AISI 4815 features a moderate nickel content with molybdenum addition, providing good core toughness and hardenability suitable for carburizing applications. | Element | Content Range (%) | Metallurgical Function | |---------|-------------------|------------------------| | Carbon (C) | 0.13–0.18 | Provides base hardenability while maintaining excellent core toughness | | Manganese (Mn) | 0.40–0.60 | Enhances hardenability and strength | | Silicon (Si) | 0.15–0.35 | Deoxidizer, solid solution strengthening | | Nickel (Ni) | 3.25–3.75 | **Primary alloying element:** Significantly improves core toughness and impact resistance | | Chromium (Cr) | — | Not typically specified (may be present as residual ≤0.20%) | | Molybdenum (Mo) | 0.20–0.30 | Refines grain structure, improves hardenability, enhances toughness | | Phosphorus (P) | ≤0.035 | Residual element | | Sulfur (S) | ≤0.040 | Residual element | ## 4. Pseudocarburizing Process & Metallurgical Effects ### 4.1 Process Sequence: 1. **Pseudocarburizing Thermal Cycle:** - **Temperature:** 900–925°C (1650–1700°F) – Typical carburizing temperature range - **Atmosphere:** Neutral (endothermic gas or nitrogen-based) - **Time:** Equivalent to intended carburizing cycle duration (typically 4–12 hours depending on required simulation depth) - **Cooling:** May involve slow cooling or specific cooling rates to simulate actual process conditions 2. **Optional Additional Processing:** - May include subsequent thermal treatments to simulate final quenching and tempering cycles - Typically results in a normalized or normalized-and-tempered condition ### 4.2 Metallurgical Objectives: - **Grain Growth Simulation:** Replicates the austenite grain growth that occurs during actual carburizing - **Thermal History Replication:** Subjects material to identical time-temperature profile as production parts - **Microstructure Development:** Creates the same core microstructure (grain size, phase distribution) as carburized components - **Dimensional Change Prediction:** Allows measurement of growth and distortion patterns ## 5. Mechanical & Physical Properties (Pseudocarburized Condition) ### 5.1 Typical Properties: | Property | Typical Value | Test Standard | Notes | |----------|---------------|---------------|-------| | **Hardness** | 85–95 HRB (160–190 HB) | ASTM E18/E10 | Represents annealed/normalized core condition | | **Tensile Strength** | 500–650 MPa (72–94 ksi) | ASTM E8 | Core strength before final hardening | | **Yield Strength (0.2%)** | 275–415 MPa (40–60 ksi) | ASTM E8 | | | **Elongation** | 25–30% | ASTM E8 | Excellent ductility for machining | | **Reduction of Area** | 50–60% | ASTM E8 | | | **Impact Toughness** | 80–120 J (59–89 ft-lb) @ RT | ASTM E23 | Excellent due to nickel content | | **Grain Size** | ASTM 6–8 (may coarsen during simulation) | ASTM E112 | Depends on pseudocarburizing parameters | ### 5.2 Microstructural Characteristics: - **Structure:** Predominantly fine pearlite and ferrite - **Grain Size:** May show some coarsening compared to as-received material - **Carbides:** Minimal, distributed uniformly - **Inclusions:** Typical for aircraft-quality steel ## 6. Key Applications & Use Cases ### 6.1 Primary Engineering Applications: 1. **Prototype Development:** - Functional testing of gear designs - Assembly verification and fit-check - Load testing under simulated conditions 2. **Process Development & Validation:** - Machinability studies for post-carburize operations - Tooling design and verification - Fixture development for heat treatment 3. **Dimensional Analysis:** - Distortion prediction and compensation - Growth factor determination - Tolerance stack-up analysis 4. **Quality Assurance:** - Core property baseline establishment - Microstructure evaluation standards - Process capability studies ### 6.2 Industry Applications: - **Aerospace:** Prototype gears, bearings, and transmission components - **Automotive:** Development of high-performance drivetrain parts - **Heavy Equipment:** Large gear and bearing development - **Power Transmission:** Wind turbine gearbox component development ## 7. Manufacturing & Processing Considerations ### 7.1 Machinability: - **Excellent** in pseudocarburized condition - **Surface Finish:** Can achieve fine finishes for metrology purposes - **Tool Life:** Extended compared to hardened materials - **Chip Formation:** Favorable for precision machining ### 7.2 Dimensional Characteristics: - **Growth Prediction:** Provides data for design compensation - **Distortion Patterns:** Identifies areas requiring process optimization - **Stability:** Good dimensional stability for measurement ## 8. Quality Control & Testing ### 8.1 Required Documentation: - **Material Certification:** Chemistry and original condition - **Process Records:** Complete pseudocarburizing cycle documentation - **Test Reports:** Mechanical properties and microstructure ### 8.2 Recommended Testing: - **Full Mechanical Characterization:** Tensile, impact, hardness - **Microstructural Analysis:** Grain size, phase distribution - **Dimensional Analysis:** Before/after pseudocarburizing - **Non-Destructive Testing:** As required for specific applications ## 9. Comparative Analysis | Condition | Hardness | Machinability | Purpose | Cost Factor | |-----------|----------|---------------|---------|-------------| | **Pseudocarburized** | Low (85–95 HRB) | Excellent | Development/Testing | Medium | | Annealed | Low | Excellent | Initial Machining | Low | | Carburized & Hardened | High (58–63 HRC) | Poor (grinding only) | Final Service | High | ## 10. Technical Limitations 1. **No Case Hardness:** Surface properties differ from final carburized parts 2. **Wear Characteristics:** Cannot simulate wear resistance of carburized case 3. **Fatigue Properties:** Core fatigue properties only, no case contribution 4. **Application Restriction:** **Not suitable for final service components** ## 11. Storage & Handling - **Condition:** Supplied in processed condition - **Protection:** Standard VCI packaging or protective coating - **Identification:** Clearly marked as "PSEUDOCARBURIZED - NOT FOR SERVICE" - **Shelf Life:** Indefinite with proper corrosion protection ## 12. Special Notes **Critical Distinction:** This material represents only the **core condition** of what would become a carburized component. It lacks: - High-carbon surface layer - Case hardness (58–63 HRC) - Compressive residual stresses in the case - Wear resistance properties **Typical Development Workflow:** 1. Machine prototype from pseudocarburized material 2. Perform dimensional analysis and functional testing 3. Refine design based on results 4. Develop heat treatment compensation factors 5. Proceed with production using actual carburizing process ## 13. Environmental & Safety - **Compliance:** RoHS and REACH compliant - **Recyclability:** 100% as alloy steel scrap - **Safety:** Standard steel handling precautions apply - **Disposal:** Standard ferrous metal recycling procedures --- **IMPORTANT NOTICE:** This product is intended for **ENGINEERING DEVELOPMENT, TESTING, AND QUALIFICATION PURPOSES ONLY**. It should not be used in any final application where case hardening is required for performance or safety reasons. All design validations using this material should be verified with actual carburized production components before final approval. *Values and characteristics provided are typical and may vary based on specific processing parameters. For critical applications, conduct appropriate testing to verify properties.* -:- For detailed product information, please contact sales. -: AISI 4815 Steel, pseudocarburized Specification Dimensions Size： Diameter 20-1000 mm Length <5663 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 4815 Steel, pseudocarburized Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4815 Steel Tube, pseudocarburized -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4815 Steel Tube, pseudocarburized -:- For detailed product information, please contact sales. -:

Packing of AISI 4815 Steel Tube, pseudocarburized -:- 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 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 2134 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