AISI 1548 Steel, cold drawn

AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1548 Steel, Cold Drawn Round Bar (19-32 mm / 0.75-1.25 in)** **Overview** AISI 1548 is a high-manganese, high-carbon alloy steel supplied in the precision **cold drawn** condition as round bars in the diameter range of **19-32 mm (0.75-1.25 in)**. This advanced manufacturing process involves drawing hot-rolled stock through a die at room temperature, resulting in a product with superior dimensional accuracy, a bright, smooth surface finish, and significantly enhanced mechanical properties via strain hardening. The high manganese content (1.40-1.70%) provides exceptional inherent hardenability, while cold drawing transforms it into a premium material offering very high as-supplied strength, excellent straightness, and tight tolerances. It is engineered for the most demanding applications requiring precision, extreme load-bearing capacity, wear resistance, and a superior starting condition for final ultra-high-strength heat treatment. **Key Features & Advantages** * **Very High As-Drawn Strength & Hardness:** The cold drawing process substantially increases yield and tensile strength through intense strain hardening. This provides exceptional "ready-to-use" strength that can serve as the final condition for some applications or as a pre-hardened state for machining. * **Precision Dimensional Control & Superior Surface Quality:** Offers tight diameter tolerances (ASTM A108), excellent straightness, and a smooth, bright, scale-free surface with low roughness (Ra). This reduces machining allowances, improves part fit, and enhances fatigue performance. * **Exceptional Hardenability for Final Heat Treatment:** The high manganese content ensures deep and uniform hardenability. For ultimate strength, this material provides a consistent, cold worked microstructure that responds predictably to quenching & tempering, achieving extreme hardness (HRC 50-58+). * **Good Machinability for its Strength Class:** While challenging, it offers consistent and predictable machinability for a steel of its strength level, enabling production of precision components with proper tooling and parameters. * **Manufacturing Efficiency for High-Performance Parts:** Serves as a near-net-shape material that reduces processing steps and provides consistent quality for critical, ultra-high-strength components. --- ### **1. Chemical Composition (Standard Conformance)** | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.44 – 0.52 | **Very high carbon content.** Primary source of ultimate hardness, strength, and wear resistance. Enables formation of ultra-high-carbon martensite. | | **Manganese (Mn)** | 1.40 – 1.70 | **Primary Alloying Element.** Dramatically increases hardenability, ensuring full through-hardening of this section size. Critical for achieving uniform high strength. | | **Phosphorus (P)** | ≤ 0.040 (max) | Residual element, minimized for toughness. | | **Sulfur (S)** | ≤ 0.050 (max) | Residual element, kept low. **Not a free-machining steel.** | | **Silicon (Si)** | 0.15 – 0.35 | Deoxidizer; solid solution strengthener. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G15480 * **AISI/SAE:** 1548 * **ASTM:** **A108** (Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished) * **DIN (Germany):** No direct equivalent. * **EN (Europe):** No direct equivalent. --- ### **2. Typical Physical & Mechanical Properties (Cold Drawn Condition, 19-32 mm)** *Properties reflect intense strain hardening from cold drawing. Values are for the as-drawn state.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Tensile Strength** | 850 – 1050 MPa (123 – 152 ksi) | | **Yield Strength (0.2% Offset)** | **750 – 950 MPa (109 – 138 ksi)** – *Primary benefit of cold work* | | **Elongation (in 50mm)** | 8% – 14% | | **Brinell Hardness (HB)** | 260 – 320 | | **Machinability (Comparison)** | **Very Poor (~20-25% of AISI 1212).** Requires powerful, rigid equipment, premium carbide/PcBN tooling, low speeds, and heavy coolant flow. | | **Surface Roughness (Ra)** | 1.6 – 3.2 μm (63 – 125 μin). Bright, smooth finish. | | **Tolerances** | Meets ASTM A108 cold-drawn tolerances. | | **Hardenability Potential** | Very High; excellent candidate for subsequent quenching & tempering to achieve ultimate strength (HRC 50-58+). | --- ### **3. Product Applications** AISI 1548 cold drawn rounds are specified for the most critical, ultra-high-strength, wear-resistant components. * **Ultra-High-Strength Precision Shafting:** Axle shafts, drive shafts, and spindle shafts for extreme performance applications (racing, aerospace, heavy industry). * **High-Performance Fasteners & Pins:** Shear pins, locking pins, and high-integrity bolts for critical connections in energy, defense, and heavy machinery. * **Wear-Resistant Tooling Components:** Mandrels, guide rods, wear plates, and fixture components subject to extreme abrasion. * **Tool Steel Applications:** Punches, dies, and cutting tool blanks where high carbon and hardenability are required. * **Agricultural and Mining Wear Parts:** Cutting edges, bucket teeth adapters, and crusher components requiring maximum abrasion resistance. * **Specialty Gears and Sprockets:** For through-hardened components requiring extreme surface hardness and core strength. --- ### **4. Critical Considerations** * **Residual Stress Management:** Cold drawing induces extremely high residual surface stresses. **A mandatory stress-relieving heat treatment (e.g., 550-650°C / 1020-1200°F) prior to any significant machining is absolutely required** to prevent catastrophic distortion or cracking during machining. * **Heat Treatment Strategy:** Can be used: 1) **As-drawn** for applications utilizing its exceptional cold-worked strength (rare). 2) **Stress relieved, machined, then quenched & tempered** for maximum strength in finished parts. **Direct machining followed by quenching is extremely high-risk.** * **Machinability:** Extremely difficult to machine. Often requires grinding or hard turning operations. For extensive machining, specifying an **annealed condition** is strongly advised, though this sacrifices the as-drawn strength. * **Quenching Sensitivity:** Due to its very high carbon content, it is **extremely susceptible to quench cracking**. Oil quenching with careful control is mandatory. **Immediate tempering** is non-negotiable. * **Weldability:** **Generally Unweldable.** Should not be considered for welded fabrication. If repair is absolutely necessary, it requires exotic procedures with very high preheat, specialized filler metals, and controlled PWHT, with very high risk of failure. * **Toughness Limitation:** Inherently brittle, especially in the as-drawn or as-quenched state. Proper tempering is crucial to develop any usable toughness. Not suitable for high-impact applications. * **Comparison to Hot-Rolled 1548:** Offers superior surface finish, tighter tolerances, much higher strength, and better straightness. * **Comparison to 4140/4340 Cold Drawn:** 1548 CD can achieve higher hardness but has significantly lower toughness and weldability. 41xx/43xx steels are superior for most high-integrity engineering applications; 1548 is specialized for maximum hardness/wear. --- **Disclaimer:** **AISI 1548 Cold Drawn is an extreme-performance material requiring expert handling.** It presents significant challenges in machining, heat treatment, and fabrication. This information is based on standard specifications. Actual properties may vary. For any application, consult certified material test reports and conduct extensive process validation. This material is not suitable for general engineering use and should be selected only when its specific properties are absolutely required and can be properly managed. -:- For detailed product information, please contact sales. -: AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <5047 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 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1548 Steel, cold drawn, 19-32 mm (0.75-1.25 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 1518 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