AISI 51B60H Steel, normalized

AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 51B60H Steel, Normalized Condition, 13 mm (0.5 in.) Round Bar** --- #### **1. Product Overview** This product is a **13 mm (0.5 inch) diameter round bar** of **AISI 51B60H alloy steel**, supplied in the **normalized condition**. It represents a **high-performance, value-optimized material specification**, combining three key attributes: 1) **Guaranteed hardenability ("H" designation)**, 2) **Cost-effective boron-enhanced hardenability ("B")**, and 3) An **optimized normalized microstructure** for machining and heat treatment preparation. This bar is engineered for high-volume production of precision components where absolute consistency in final hardened properties, dimensional stability during machining, and overall cost-effectiveness are critical success factors. #### **2. Material & Condition Concept: Precision-Engineered Consistency** - **Base Material (AISI 51B60H):** A **hardenability-controlled, boron-treated steel**. The "H" suffix guarantees the steel's Jominy hardenability falls within a strict SAE J1268 band, ensuring predictable quenching behavior. The boron addition provides a potent, economical boost to this hardenability. - **Normalized Condition:** The steel has been reheated to approximately 870-900°C (1600-1650°F) and uniformly air-cooled. For this small diameter and premium grade, normalization: 1. **Delivers a Refined, Uniform Grain Structure:** Essential for predictable machining characteristics and final part toughness. 2. **Provides Ideal Pre-Hardening State:** Creates a stable, stress-relieved condition with optimal strength for precision machining, minimizing deflection. 3. **Ensures "H" Band Validity:** The certified hardenability is predicated on a fully austenitized state; normalization provides a homogeneous, fine-grained precursor that guarantees this. #### **3. International Standard & Specifications** - **Governing Standard:** **ASTM A304** - The definitive standard for hardenability-controlled bars. - **Material Reference:** **SAE J404** (Compositions) & **SAE J1268** (Hardenability Bands for 51B60H). - **Condition Standard:** **ASTM A29/A29M** (Normalized condition). - **UNS Designation:** **H51601** - **Common Procurement Spec:** **ASTM A304, Grade 51B60H, Normalized**. - **European/Japanese Equivalent:** No direct equivalent for this combined "H"-band and boron system. #### **4. Chemical Composition (% by Weight, per SAE J1268 for 51B60H)** *Chemistry is managed within wider ranges to consistently hit the target hardenability band.* | Element | Content Range (%) | Key Role | | :--- | :--- | :--- | | **Carbon (C)** | **0.55 – 0.65** | Primary hardening element; range is tuned for the hardenability curve. | | **Manganese (Mn)** | **0.70 – 1.05** | A major hardenability driver; its wider range is critical for band control. | | **Phosphorus (P)** | **≤ 0.035** | Impurity; kept low. | | **Sulfur (S)** | **≤ 0.040** | Impurity; kept low. | | **Silicon (Si)** | **0.15 – 0.35** | Deoxidizer; strengthens ferrite matrix. | | **Chromium (Cr)** | **0.60 – 1.00** | Provides baseline hardenability and wear resistance. | | **Boron (B)** | **0.0005 – 0.003** | **Critical Performance Element.** A controlled trace addition that multiplies hardenability cost-effectively. | | **Titanium (Ti)** | **(Controlled addition)** | **Essential Boron Protectant**, ensuring boron's efficacy. | | **Iron (Fe)** | **Balance** | Base metal. | #### **5. Physical & Mechanical Properties (As-Normalized, 13mm Round)** **A. Physical Properties:** - **Diameter:** 13.0 mm ± 0.2 mm (Precision cold-drawn or turned tolerance standard for "H" grades). - **Straightness:** Excellent, suitable for automated feeding and machining. - **Surface Condition:** High-quality descaled, pickled & oiled, or precision turned finish. Excellent surface integrity with minimal decarburization. - **Density:** 7.85 g/cm³ **B. Mechanical Properties (Normalized State):** - **Hardness (Brinell):** **229 – 285 HBW** (Approx. **100 – 108 HRB / 22-30 HRC**) - **Tensile Strength:** **770 – 930 MPa** (112 – 135 ksi) - **Yield Strength (0.2% Offset):** **≥ 485 MPa** (70 ksi) - **Elongation in 50mm:** **≥ 14%** - **Machinability:** **Very Good.** Rating ~70%. The fine, consistent normalized structure offers stable cutting, good chip breakage, and excellent surface finish. **C. Certified Hardenability (The Defining Property):** *The material certification includes **actual Jominy hardenability test results** proving compliance with the SAE J1268 band for 51B60H. For a 13mm round, this guarantees that after proper austenitizing and oil quenching, the entire cross-section will transform uniformly to high-hardness martensite (e.g., 58-63 HRC as-quenched), providing a perfectly consistent foundation for tempering.* #### **6. Key Characteristics & Value Proposition** - **Elimination of Heat Treatment Variation:** The primary value. Enables "foolproof" high-volume heat treating with zero lot-to-lot adjustment, maximizing furnace throughput and eliminating sorting/rework. - **Superior Manufacturing Efficiency:** The normalized state is the optimal condition for finish machining prior to hardening, offering the perfect balance of machinability and dimensional stability for tight-tolerance parts. - **Optimized Cost-Performance:** Delivers the guaranteed consistency of an "H" grade with the hardenability boost of boron, often at a lower cost than guaranteed-hardenability grades like 86XXH, making it ideal for cost-sensitive, high-volume precision parts. - **Enhanced Quality Baseline:** "H" grade material implies stricter process controls from melting forward, resulting in better internal cleanliness and microstructure uniformity. #### **7. Typical Applications for 13mm Normalized 51B60H Round** This product is specified for high-volume, precision-critical components in automated manufacturing: - **Precision Automotive Components:** **Fuel injection pump plungers**, **small transmission shafts**, **valve guides**, and **high-strength fasteners** (e.g., critical engine bolts). - **Hydraulic & Pneumatic Spools:** **Precision valve spools** and **piston rods** for compact cylinders requiring consistent hardness and wear resistance. - **Bearing & Wear Components:** **Needle bearing rollers**, **precision pins**, and **bushings**. - **Tooling & Fixturing:** **Ejector pins**, **guide pins**, and **wear-resistant inserts** for jigs and fixtures. - **Fastener Industry:** Wire for cold-heading **high-performance screws and studs** (where normalized wire is used). #### **8. Subsequent Processing Pathway** 1. **Finish Machining:** Perform all final machining operations in this stable, normalized state. This is often the final "as-machined" condition before hardening. 2. **Hardening:** Austenitize at **830-850°C (1525-1560°F)**, then **oil quench**. The small diameter and guaranteed hardenability ensure rapid, complete through-hardening. 3. **Tempering:** Temper immediately within **400-540°C (750-1000°F)** to achieve the desired final hardness (typically **RC 45-52** for high-strength parts). 4. **Finishing:** Any required grinding, plating, or superfinishing. #### **9. Ordering & Certification Requirements** - **Specify:** **ASTM A304, Grade 51B60H, Normalized, 13 mm (0.5 in.) Round**. - **Mandatory Documentation:** The supplier **must provide a Certified Material Test Report (CMTR)** including: 1. Chemical Analysis. 2. **Jominy Hardenability Test Results** (graph and data) for SAE J1268 compliance. 3. Mechanical properties from a normalized test coupon. - **Quality:** Expect superior surface finish and tighter controls on dimensions and decarburization. --- **Disclaimer:** The normalized properties are for processing. **This material must be quenched and tempered for service use.** The "H" designation certifies the *hardenability*, enabling precise prediction of the *as-quenched* hardness. The final tempered properties are determined by the tempering cycle. This is a premium material for applications where performance consistency, traceability, and manufacturing efficiency are non-negotiable. The provided Jominy data must be used to validate the heat treatment process. -:- For detailed product information, please contact sales. -: AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <5176 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 51B60H Steel, normalized, 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 51B60H Steel, normalized, 13 mm (0.5 in.) round -:- 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 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 1647 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