AISI 86B50 Steel Rod/Bar

AISI 86B50 Steel Rod, oil quenched 800°C (1470°F), 540°C (1000°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 86B50 Steel Rod, oil quenched 800°C (1470°F), 540°C (1000°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 86B50 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper Product Information -:- For detailed product information, please contact sales. -: **Product Overview: AISI 86B50 Steel, Oil Quenched & Tempered (800°C / 540°C)** This document provides a technical introduction to components manufactured from **AISI 86B50** alloy steel, heat-treated to a high-strength condition through **oil quenching from 800°C (1470°F) followed by tempering at 540°C (1000°F)**. This specific thermal treatment leverages the steel's boron-enhanced hardenability to produce a microstructure offering an outstanding combination of very high strength, good toughness, and excellent fatigue resistance. **1. International Standard Designations** * **AISI/SAE (USA):** 86B50 (The "B" denotes Boron treatment for enhanced hardenability) * **ASTM (USA):** A304 (Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements) * **UNS:** G86600 * **Common Specification for Heat-Treated Bars:** ASTM A29/A29M can be invoked for heat-treated material, though final properties are often governed by customer-specific part drawings. * **Note:** This is a distinct, boron-treated grade. Its hardenability is superior to its common non-boron counterpart (AISI 8650). Direct international equivalents are rare due to the boron addition. **2. Chemical Composition (Weight %)** The composition is engineered for high hardenability with lean alloying, centered on the potent effect of boron. | Element | Content (%) | Primary Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.48 - 0.53 | Provides core hardness and strength. | | **Manganese (Mn)** | 0.75 - 1.00 | Enhances strength and hardenability. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer, increases strength and temper resistance. | | **Chromium (Cr)** | 0.40 - 0.60 | Improves hardenability, wear, and corrosion resistance. | | **Nickel (Ni)** | 0.40 - 0.70 | Significantly increases toughness and hardenability. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Promotes deep hardening, strength, and high-temperature tempering resistance. | | **Boron (B)** | 0.0005 - 0.003 | **A powerful hardenability enhancer**; ensures full martensitic transformation in larger sections. | | **Phosphorus (P)** | ≤ 0.025 | Impurity, kept low for toughness. | | **Sulfur (S)** | ≤ 0.025 | Impurity, affects machinability. | | **Iron (Fe)** | Balance | - | **3. Heat Treatment & Resulting Microstructure** * **Austenitizing/Oil Quench:** Heated to **800°C (1470°F)** to achieve a uniform austenitic structure, followed by rapid cooling in oil. The boron addition is critical here, ensuring a deep and complete transformation to martensite even in moderate to large cross-sections. * **Tempering:** Reheated to **540°C (1000°F)** for a specified duration, then air-cooled. This mid-to-high tempering temperature effectively relieves quenching stresses, provides a substantial increase in ductility and toughness, and precipitates fine carbides to establish a stable, high-strength condition. * **Final Microstructure:** **Tempered Martensite**. This refined structure is responsible for the superior mechanical properties. **4. Resulting Physical & Mechanical Properties** *Note: Properties are highly dependent on the exact cross-section; values are typical for moderately sized sections (e.g., < 75 mm diameter).* * **Tensile Strength:** 1050 - 1200 MPa (152,000 - 174,000 psi) * **Yield Strength (0.2% Offset):** 950 - 1100 MPa (138,000 - 160,000 psi) * **Elongation (in 50mm):** ≥ 12% * **Reduction of Area:** ≥ 45% * **Hardness:** 32 - 38 HRC (Approx. 300 - 350 HBW) * **Impact Toughness (Charpy V-notch):** Good for this strength level, a direct benefit of the nickel content and the 540°C temper. * **Fatigue Strength:** Excellent, a key characteristic of the clean, tempered martensitic microstructure. **Physical Properties (Approximate at 20°C):** * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 205 GPa (29,700 ksi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~42.0 W/m·K **5. Key Characteristics & Advantages** * **High Strength with Good Toughness:** The specific tempering temperature provides an optimal balance, avoiding the embrittlement risks associated with lower tempering ranges. * **Superior Hardenability:** Boron allows for excellent through-hardening in larger sections, ensuring uniform core properties and performance. * **Excellent Fatigue and Wear Resistance:** Ideal for dynamically loaded components and applications involving sliding contact. * **Cost-Effective Performance:** The lean alloy design (enhanced by boron) provides performance comparable to more highly alloyed steels at a lower cost. * **Good Machinability (in annealed/normalized state):** Parts are typically fully machined prior to this final heat treatment. **6. Typical Applications** This heat-treated condition is specified for highly stressed, safety-critical components requiring reliability under cyclic loading. Common applications include: * **Automotive & Truck:** High-strength axle shafts, torsion bars, steering components, and critical suspension parts. * **Power Transmission:** Heavy-duty gears, pinions, and drive shafts for industrial machinery and off-highway vehicles. * **Oil & Gas:** Drill string components (e.g., subs), tool joints, and high-grade fasteners. * **Heavy Equipment:** Track pins, bushings, linkage arms, and pivot shafts for construction and mining machinery. * **Agriculture:** High-stress driveline and implement components. **7. Available Form & Notes** * **Form:** Supplied as finished or semi-finished **components** (e.g., machined forgings, turned bars) in this heat-treated condition. * **Condition:** **Oil Quenched from 800°C and Tempered at 540°C**. * **Post-Treatment Machining:** Limited grinding or hard machining is possible; welding is not recommended without extensive pre- and post-weld heat treatment. * **Quality Verification:** Properties are typically verified through hardness testing and often tensile/impact testing on sample coupons from the same heat treat lot. **Disclaimer:** The properties listed are representative. For engineering design, exact property guarantees must be agreed upon with the supplier, considering the specific part geometry and relevant testing standards (e.g., ASTM A370). The boron-treated grade requires precise heat treatment control to realize its full potential. -:- For detailed product information, please contact sales. -: AISI 86B50 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6377 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 86B50 Steel, oil quenched 800°C (1470°F), 540°C (1000°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 86B50 Steel Rod, oil quenched 800°C (1470°F), 540°C (1000°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 86B50 Steel Rod, oil quenched 800°C (1470°F), 540°C (1000°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 86B50 Steel Rod, oil quenched 800°C (1470°F), 540°C (1000°F) temper -:- 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 2848 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