AISI 1548 Steel Seamless tube

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

AISI 1548 Steel, annealed, 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, Annealed & Cold Drawn Round Bar (19-32 mm / 0.75-1.25 in)** **Overview** AISI 1548 steel in the **annealed and cold drawn** condition is a premium-processed, ultra-high-strength alloy steel supplied as round bars in the **19-32 mm (0.75-1.25 in)** diameter range. This specialized two-step treatment involves first subjecting the steel to a full annealing process to achieve a soft, ductile, and stress-free microstructure, followed by a controlled cold drawing operation. This sequence is specifically engineered to make this otherwise difficult-to-machine, high-carbon, high-manganese steel suitable for **precision machining of complex components**. It provides the optimal balance between exceptional machinability, dimensional precision, and a moderate strength increase, serving as the perfect pre-hardened blank for components destined for final ultra-high-strength heat treatment. **Key Features & Advantages** * **Optimized Machinability for High-Carbon Steel:** The annealing process transforms the hard, as-rolled structure into a soft, spheroidized condition, dramatically reducing cutting forces, extending tool life, and enabling the machining of complex geometries that would be impossible in the standard hot-rolled or cold drawn state. * **Precision Dimensional Control:** The subsequent cold drawing imparts excellent diameter tolerances (ASTM A108), superior straightness, and a bright, smooth surface finish. This ensures reliable performance in automated feeders and achieves precise final part dimensions after machining. * **Exceptional Dimensional Stability:** The combination of complete stress relief from annealing and the uniform, light cold work provides maximum stability during machining. This is critical for preventing warping or distortion in intricate, high-value components prior to their final hardening. * **Enhanced Handleability & Strength:** While prioritizing machinability, the final drawing step provides a controlled increase in yield strength and improves surface finish compared to purely annealed stock, offering a more robust and easier-to-handle machining blank. * **Ideal, Uniform Pre-Condition for Final Hardening:** Creates a perfectly uniform, stress-free, and machinable blank that is predictably prepared for subsequent quenching & tempering. This minimizes and controls distortion during the final ultra-high-strength heat treatment. --- ### **1. Chemical Composition (Standard Conformance)** | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.44 – 0.52 | **Very high carbon content.** Provides the fundamental potential for ultra-high hardness and strength after final heat treatment. In the annealed state, carbon exists as soft, globular carbides. | | **Manganese (Mn)** | 1.40 – 1.70 | **Primary Alloying Element.** Provides exceptional hardenability potential, ensuring the steel will transform uniformly to high-hardness martensite upon final quenching. | | **Phosphorus (P)** | ≤ 0.040 (max) | Residual element, kept low. | | **Sulfur (S)** | ≤ 0.050 (max) | Residual element, kept low. **Not a free-machining steel.** | | **Silicon (Si)** | 0.15 – 0.35 | Deoxidizer; strengthens ferrite. | | **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 – Annealed and Cold Drawn is a specified condition) * **DIN (Germany):** No direct equivalent. * **EN (Europe):** No direct equivalent. --- ### **2. Typical Physical & Mechanical Properties (Annealed & Cold Drawn Condition, 19-32 mm)** *Note: Properties reflect a fully softened state with minor strengthening from the final light drawing pass. This is a PRE-MACHINING condition.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Tensile Strength** | 620 – 780 MPa (90 – 113 ksi) | | **Yield Strength (0.2% Offset)** | 400 – 550 MPa (58 – 80 ksi) | | **Elongation (in 50mm)** | 16% – 22% | | **Brinell Hardness (HB)** | 190 – 230 | | **Machinability (Comparison)** | **Fair to Good (~55-60% of AISI 1212).** This is the key advantage – it makes machining of this ultra-high-carbon grade feasible and efficient. | | **Surface Roughness (Ra)** | 1.6 – 3.2 μm (63 – 125 μin). Bright, smooth commercial finish. | | **Tolerances** | Meets ASTM A108 cold-drawn tolerances. | | **Microstructure** | Fully spheroidized cementite in a ferrite matrix, lightly strained from drawing. | --- ### **3. Product Applications** This material is specifically engineered as the starting stock for complex, ultra-high-strength components that require extensive precision machining before final hardening. * **Complex Ultra-High-Strength Gear Blanks:** Intricate gear and spline profiles for aerospace, defense, or high-performance automotive applications that will be carburized or through-hardened to extreme hardness levels. * **Precision Tooling Blanks:** Blanks for punches, dies, molds, and forming tools requiring extensive EDM, milling, or grinding to intricate shapes before final heat treatment. * **Critical Aerospace & Defense Components:** Complex actuator parts, weapon system components, and landing gear parts that must be machined to precise tolerances in a soft state before achieving final strength. * **Specialty Fastener Blanks:** For high-integrity fasteners requiring complex machining or thread rolling prior to heat treatment. * **Wear Part Pre-Forms:** Components like wear plates or tool holders with complex internal features or mounting geometries that must be machined before being hardened for service. * **Any component** where the geometric complexity necessitates machining in a soft state, and the final service requirement demands the ultra-high hardness and strength achievable only from the 1548 chemistry after quenching & tempering. --- ### **4. Process Rationale & Critical Considerations** * **Process Sequence Rationale:** 1. **Full Anneal (Spheroidize Anneal):** Heated to the appropriate temperature and slowly cooled to transform all hard carbides into soft, globular particles. This is **essential** to make the steel machinable. 2. **Light Cold Draw:** Primarily to achieve dimensional accuracy, straightness, and surface quality. The strength increase is incidental; the goal is **not** significant strain hardening. * **Fundamental Purpose:** **This condition exists solely to enable machining.** The annealed microstructure has low strength and is unsuitable for service. Its only purpose is to be machined to final dimensions before the final, separate hardening heat treatment. * **Mandatory Subsequent Heat Treatment:** Components made from this material **MUST** undergo quenching and tempering to achieve their design properties (typically aiming for HRC 50-58+). This two-step process (machine soft, then harden) is chosen to **avoid the severe distortion and cracking risks** that would occur if one attempted to machine the already-hardened material or quench a complex, machined part from the as-rolled state. * **Distortion Management:** Even with this optimal pre-condition, the final quench will cause dimensional changes. The uniform, stress-free starting condition provided by this material allows these changes to be more predictable and manageable. * **Cost & Lead Time:** This is a premium processing route with higher cost and longer lead times than standard hot-rolled or cold drawn material. The justification is the **enabled manufacturability** of otherwise unmachinable complex geometries in an ultra-high-strength steel. * **Not a Final Material:** **It is crucial to understand that AISI 1548 Annealed and Cold Drawn is not a finished material.** It is a **manufacturing intermediary**. --- **Disclaimer:** **AISI 1548 Annealed and Cold Drawn is a specialized manufacturing intermediary for ultra-high-strength components.** It is supplied in a condition suitable **only for machining**, not for service. The final component **must** be heat treated (quenched & tempered) to achieve functional properties. This process route requires expertise in heat treatment distortion prediction and control. Selection should be based on a comprehensive analysis of part geometry, final performance requirements, and total manufacturing cost. Always specify and review the required final heat treatment cycle with your heat treater during the design phase. -:- For detailed product information, please contact sales. -: AISI 1548 Steel, annealed, cold drawn, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <5048 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, annealed, cold drawn, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 1548 Steel Seamless tube, annealed, 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 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 1519 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