AISI 50B50 Steel Capillary

AISI 50B50 Steel Capillary Product Information -:- For detailed product information, please contact sales. -: AISI 50B50 Steel Capillary Synonyms -:- For detailed product information, please contact sales. -:

AISI 50B50 Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 50B50 Boron-Alloyed Steel** **AISI 50B50** is a medium-carbon, boron-treated, hardenable steel designed for applications that demand a balance of high strength, good wear resistance, and reliable toughness. The defining feature of this grade is its intentional addition of boron (typically 0.0005%-0.003%), which significantly enhances hardenability—the depth and uniformity of hardening during heat treatment. This allows for the effective hardening of larger cross-sections compared to standard carbon steels, without relying heavily on costly alloying elements like chromium or nickel. 50B50 is an economical and high-performance choice for heavily stressed components. It is typically supplied in the annealed or hot-rolled condition, ready for machining or forming, and is intended to be heat treated (quenched and tempered) by the manufacturer to achieve its final mechanical properties. The carbon content is slightly higher than the similar 50B46 grade, providing the potential for greater ultimate strength and hardness in the fully heat-treated state. --- ### **1. Chemical Composition** The chemical composition is the basis for 50B50's properties. Boron dramatically increases hardenability, while sulfur improves machinability in the supplied state. | Element | Composition Range (%) | Purpose & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.48 - 0.53 | Primary hardening element. Provides high strength, hardness, and wear resistance after heat treatment. Slightly higher than 50B46 for increased strength potential. | | **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 and reduce segregation. | | **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 (like ferrite and pearlite) during quenching. | | **Iron (Fe)** | Balance | Base metal. | *Note: Silicon (Si) is typically present in small amounts (e.g., 0.15-0.35%) as a deoxidizer but is not always a primary controlled element in the standard specification.* --- ### **2. Physical & Mechanical Properties** Properties are highly dependent on the heat treatment condition. **A. In the Annealed/Hot-Rolled Condition (As-Supplied):** * **Hardness:** ~ 187 BHN (Brinell) * **Tensile Strength:** ~ 655 MPa (95 ksi) * **Yield Strength:** ~ 380 MPa (55 ksi) * **Elongation:** ~ 22% * **Machinability:** Good (enhanced by controlled sulfur content). **B. After Quenching and Tempering (Example):** * **Typical Process:** Austenitize at ~845-855°C (1550-1575°F), quench in oil, and temper at a selected temperature (e.g., 425-600°C / 800-1110°F). * **Resulting Hardness Range:** 38 - 55 HRC (depending on tempering temperature and part size). * **Core Properties:** Achieves a very hard, wear-resistant surface with a strong, tough, and ductile core, capable of withstanding high torsional and bending stresses. --- ### **3. Product Applications** AISI 50B50 is widely used for high-strength, critical components that are heat treated after forming or machining. * **Automotive & Trucking:** **Axle shafts** (a primary application), steering components (stub axles, arms), transmission shafts, **high-strength bolts and studs** (Grade 10.9 and above), clutch components, and torsion bars. * **Agricultural Machinery:** Heavy-duty gears, drive shafts, tillage tool shanks, plough beams, and pivot pins. * **Industrial Equipment:** Hydraulic piston rods, spindles, lever arms, and other high-stress machine components. * **Forgings:** Excellent for drop-forged and hot-forged parts that require subsequent heat treatment to achieve final properties, such as connecting rods and yokes. --- ### **4. International Standards & Equivalent Grades** AISI 50B50 is primarily defined under the SAE/AISI system. Equivalent or closely related grades in other international standards include: | Standard | Grade Designation | Note | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **50B50** / **50B50H** | The primary standard. Governed by SAE J404, J412, and **J1868** for H-band hardenability (if specified as "H" grade). | | **UNS** | G50500 | Unified Numbering System code. | | **DIN (Germany)** | **50B50** | Similar specification. | | **EN (Europe)** | **1.5530** | Common numerical designation for boron-alloyed steels in this carbon range. | | **JIS (Japan)** | **SB50** / **SB49** | Japanese equivalent for boron steel. | | **GB (China)** | **50B** / **50MnB** | Chinese equivalents; composition is similar but not identical. | **Key Standard Reference:** For guaranteed hardenability, the **SAE J1868** standard is critical. It defines the hardenability band for "H" grades (e.g., 50B50H), ensuring predictable and consistent depth of hardening across different production heats, which is essential for designing reliable high-performance parts. --- ### **Summary** AISI 50B50 is a **high-performance, cost-optimized steel** that leverages boron to achieve exceptional hardenability. Its slightly elevated carbon content provides excellent strength and wear resistance potential after heat treatment. It is a preferred material for **high-stress, safety-critical components** like axle shafts and high-grade fasteners, where a combination of a hard, wear-resistant surface and a tough, fatigue-resistant core is paramount. Its predictable response to heat treatment and good machinability in the supplied state make it a highly efficient and reliable choice for demanding engineering applications. -:- For detailed product information, please contact sales. -: AISI 50B50 Steel Specification Dimensions Size： Diameter 20-1000 mm Length <4101 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 50B50 Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 50B50 Steel Capillary -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 50B50 Steel Capillary -:- For detailed product information, please contact sales. -:

Packing of AISI 50B50 Steel Capillary -:- 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 Capillary 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 572 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