AISI 50B46H Steel Seamless tube

AISI 50B46H Steel Seamless tube Product Information -:- For detailed product information, please contact sales. -: AISI 50B46H Steel Seamless tube Synonyms -:- For detailed product information, please contact sales. -:

AISI 50B46H Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 50B46H Boron-Alloyed Steel** **AISI 50B46H** is a medium-carbon, boron-alloyed, hardenable steel specifically engineered for applications requiring high surface hardness, good wear resistance, and a tough core. The key characteristic of this steel is the addition of a small but effective amount of boron (typically 0.0005%-0.003%), which significantly enhances its hardenability without the need for expensive alloying elements like chromium, nickel, or molybdenum in large quantities. This makes 50B46H a cost-effective alternative to more traditional alloy steels for many components. It is commonly supplied in the annealed or cold-drawn condition and is designed to be heat-treated (quenched and tempered) by the end-user to achieve its optimal mechanical properties. The “H” suffix in its designation explicitly indicates that its chemical composition is controlled within specific limits to guarantee a predictable hardenability band, as defined by standards like SAE J1868. --- ### **1. Chemical Composition** The chemical composition is the foundation of 50B46H's properties. The boron addition dramatically increases the depth to which the steel can be hardened during quenching. | Element | Composition Range (%) | Purpose & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.44 - 0.49 | Primary hardening element. Provides high strength and wear resistance after heat treatment. | | **Manganese (Mn)** | 0.75 - 1.00 | Increases hardenability, strength, and hardness. Aids in deoxidation during steelmaking. | | **Phosphorus (P)** | ≤ 0.035 (max) | Impurity. Kept low to prevent cold brittleness. | | **Sulfur (S)** | 0.040 - 0.070 | Intentionally added to improve machinability (forms manganese sulfide inclusions). | | **Boron (B)** | 0.0005 - 0.003 | **Key element.** Greatly boosts hardenability by retarding the formation of soft transformation products during quenching. | | **Iron (Fe)** | Balance | Base metal. | *Note: Silicon (Si) content is typically present in small amounts (e.g., 0.15-0.35%) but is not always a specified controlled element in the standard.* --- ### **2. Physical & Mechanical Properties** Properties are highly dependent on the heat treatment condition. **A. In the Annealed Condition (Typical for supplied material):** * **Hardness:** ~ 183 BHN (Brinell) * **Tensile Strength:** ~ 620 MPa (90 ksi) * **Yield Strength:** ~ 415 MPa (60 ksi) * **Elongation:** ~ 25% * **Machinability:** Good (enhanced by sulfur content). **B. After Quenching and Tempering (Example):** * **Process:** Austenitize (~850°C / 1560°F), quench in oil, and temper at a chosen temperature (e.g., 400-600°C / 750-1110°F). * **Resulting Hardness Range:** 35 - 55 HRC (depending on tempering temperature and section size). * **Core Properties:** Combines a very hard, wear-resistant surface with a tough, ductile core capable of absorbing impact and fatigue stresses. --- ### **3. Product Applications** AISI 50B46H is ideal for manufacturing high-strength, wear-resistant components that are typically heat treated after forming or machining. * **Automotive:** Axle shafts, steering components (pins, arms), universal joint crosses, clutch forks, high-strength bolts and fasteners. * **Agricultural Machinery:** Gears, shafts, plough components, tillage tool pins. * **General Engineering:** High-strength bolts, studs, pins, and other critical fasteners; hydraulic piston rods, lever arms, and spindles. * **Forgings:** Commonly used for drop-forged and hot-forged parts that require subsequent heat treatment. --- ### **4. International Standards & Equivalent Grades** AISI 50B46H is primarily recognized under the SAE/AISI system. Equivalent or closely related grades in other international standards include: | Standard | Grade Designation | Note | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **50B46H** | The primary standard. Governed by SAE J404, J412, and **J1868** for H-band hardenability. | | **UNS** | G50461 | Unified Numbering System code. | | **DIN (Germany)** | **50B46** | Similar specification, often without the explicit "H" band certification. | | **EN (Europe)** | **1.5532** | Numerical designation for boron-alloyed steels. | | **JIS (Japan)** | **SB46** | Japanese equivalent for boron steel. | | **GB (China)** | **40B** / **40MnB** | Chinese equivalents; composition is similar but not identical. | **Key Standard Reference:** **SAE J1868** is critical, as it defines the methodology for determining and reporting the hardenability band (the maximum and minimum hardness values at specified distances from the quenched end in a Jominy test). This allows engineers to predict the hardness profile across a part's cross-section. --- ### **Summary** AISI 50B46H is a **cost-effective, high-hardenability steel** that leverages boron as a potent hardenability enhancer. It delivers performance comparable to more expensive alloy steels in applications demanding a combination of surface hardness and core toughness. Its predictable response to heat treatment, guaranteed by its “H”-band certification, makes it a reliable and efficient material choice for critical, high-stress components in the automotive, agricultural, and general engineering industries. -:- For detailed product information, please contact sales. -: AISI 50B46H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4100 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 50B46H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 50B46H Steel Seamless tube -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 50B46H Steel Seamless tube -:- For detailed product information, please contact sales. -:

Packing of AISI 50B46H Steel Seamless tube -:- 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 571 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