AISI 6145 Steel Rod/Bar (UNS G61450)

AISI 6145 Steel Rod (UNS G61450) Product Information -:- For detailed product information, please contact sales. -: AISI 6145 Steel Rod (UNS G61450) Synonyms -:- For detailed product information, please contact sales. -:

AISI 6145 Steel (UNS G61450) Product Information -:- For detailed product information, please contact sales. -: ## **Product Introduction: AISI 6145 (UNS G61450) Chromium-Vanadium Through-Hardening Steel** ### **Overview** AISI 6145 is a medium-carbon, low-alloy **chromium-vanadium steel** designed primarily for **through-hardening** applications. Unlike the 61xx series grades used for case hardening (e.g., 6118, 6120), 6145 has a higher carbon content, allowing it to develop high strength and hardness throughout its entire cross-section when quenched and tempered. The addition of vanadium provides grain refinement and enhances toughness, making it an excellent choice for high-strength components requiring good fatigue resistance and wearability. It is widely used in automotive, machinery, and tooling applications where uniform hardness and strength are critical. --- ### **1. Chemical Composition (Typical % by Weight, AISI/SAE Standard)** The composition of AISI 6145 is balanced to provide good hardenability, strength, and toughness through its carbon, chromium, and vanadium content. | Element | Content (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.43 - 0.48 | **Key element.** Provides high strength and hardness through the formation of martensite upon quenching. The level is optimized for a combination of hardness and toughness after tempering. | | **Manganese (Mn)** | 0.70 - 0.90 | Increases hardenability, allowing deeper and more uniform hardening in larger sections. | | **Phosphorus (P)** | ≤ 0.035 | Impurity; kept low to prevent cold brittleness. | | **Sulfur (S)** | ≤ 0.040 | Impurity; standard low level ensures good ductility and fatigue properties. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens the ferrite matrix, contributing to strength. | | **Chromium (Cr)** | 0.80 - 1.10 | Enhances hardenability significantly, improves wear resistance, and provides good tempering resistance for strength retention at elevated temperatures. | | **Vanadium (V)** | 0.15 (min) | **Critical addition.** A strong carbide former and grain refiner. Inhibits grain growth during austenitizing, resulting in a finer martensitic structure that improves **toughness and fatigue strength**. | | **Iron (Fe)** | Balance | | --- ### **2. Physical & Mechanical Properties** **A. Physical Properties (Annealed State)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (Young's Modulus):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~48 W/m·K * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (After Quenching & Tempering)** *Note: Properties vary significantly with section size and tempering temperature.* * **Typical Heat Treatment:** Austenitize at 830-850°C (1525-1560°F), oil quench, and temper between 425-650°C (800-1200°F). * **Hardness Range (Tempered):** 25 - 55 HRC (Widely adjustable via tempering temperature). * **Tensile Strength:** 700 - 1400 MPa (100 - 200 ksi) * **Yield Strength (0.2% Offset):** 550 - 1200 MPa (80 - 175 ksi) * **Elongation (in 50 mm):** 10% - 20% * **Reduction of Area:** 35% - 50% * **Impact Strength (Charpy V-notch):** Good to excellent for its strength level, thanks to vanadium's grain-refining effect. **Example Properties for a Common Condition (Oil quenched & tempered at ~540°C / 1000°F):** * Hardness: ~32-36 HRC * Tensile Strength: ~1000-1100 MPa (145-160 ksi) * Yield Strength: ~850-950 MPa (123-138 ksi) * Good machinability and toughness at this condition. --- ### **3. Product Applications** AISI 6145 is valued for its ability to be heat treated to a wide range of strength-toughness combinations, making it suitable for numerous high-stress applications. * **Automotive & Trucking:** * **Shafting:** Crankshafts, camshafts, axle shafts, propeller shafts, pump shafts. * **Gears:** Medium-duty gears, pinions, and synchronizer rings. * **Fasteners:** High-strength bolts, studs, and pins. * **General Machinery & Industrial Equipment:** * Spindles, mandrels, and arbors. * Connecting rods, piston rods, and lever arms. * High-strength machine parts subject to fatigue loading. * **Tooling & Dies:** * Wrenches, sockets, and hand tools. * Dies for forming and punching. * Wear plates and guides. * **Agriculture & Off-Highway:** * Gears, shafts, and drive components in tractors and implements. * **Aerospace:** * Non-critical structural components, landing gear parts (secondary), and actuator components. --- ### **4. International Standards & Designations** AISI 6145 is recognized in several major standards, though direct equivalents may have minor compositional variations. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE/AISI 6145** | Standard designation in the "61xx" (Cr-V) series. | | **UNS (USA)** | **G61450** | Unified Numbering System designation. | | **ASTM (USA)** | **ASTM A322** (Grade 6145) | Standard specification for hot-rolled or cold-finished alloy steel bars. | | **DIN / EN (Germany/EU)** | **~1.8159 (50CrV4)** | The closest and most recognized European equivalent. 50CrV4 has a similar carbon and chromium range and is renowned for its excellent spring properties and toughness. | | **JIS (Japan)** | No direct equivalent | Similar through-hardening chromium steels like **SCr440 (JIS G4104)** have comparable applications but lack vanadium. | | **GB (China)** | **50CrVA (GB/T 3077)** | A nearly identical Chinese specification widely used for spring and high-strength applications. | | **ISO** | **Type 9** (ISO 683-11) | Falls under alloy steels for quenching and tempering. | --- ### **Summary** AISI 6145 (UNS G61450) is a versatile and reliable **medium-carbon chromium-vanadium through-hardening steel**. Its key advantages are: 1. **Excellent Hardenability:** Achieves uniform strength in moderate to large sections. 2. **Superior Toughness:** The vanadium addition refines the grain structure, providing exceptional impact and fatigue resistance for its strength level. 3. **Wide Property Range:** Allows engineers to tailor final hardness and strength (from ~30 to 55 HRC) through tempering to meet specific application needs. It serves as a cost-effective alternative to more highly alloyed steels for applications requiring a combination of high strength, good wear resistance, and reliable toughness, such as critical shafts, fasteners, and machinery components. Its closest international counterpart, **50CrV4**, underscores its standing as a globally respected material for demanding engineering purposes. -:- For detailed product information, please contact sales. -: AISI 6145 Steel (UNS G61450) Specification Dimensions Size： Diameter 20-1000 mm Length <4137 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 6145 Steel (UNS G61450) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 6145 Steel Rod (UNS G61450) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 6145 Steel Rod (UNS G61450) -:- For detailed product information, please contact sales. -:

Packing of AISI 6145 Steel Rod (UNS G61450) -:- 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 Rod 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 608 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