AISI 1548 Steel, hot rolled

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

AISI 1548 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1548 Steel, Hot Rolled Round Bar (19-32 mm / 0.75-1.25 in)** **Overview** AISI 1548 is a high-manganese, high-carbon alloy steel supplied in the economical **hot rolled** condition as round bars in the diameter range of **19-32 mm (0.75-1.25 in)**. As part of the "15xx" series of **manganese alloy steels**, it is characterized by a significantly elevated manganese content (1.40-1.70%) combined with a high carbon level, positioning it at the upper end of medium-high carbon steels. This composition delivers exceptional hardenability, very high strength potential, and good wear resistance. Supplied in the as-rolled state, this product serves as a cost-effective raw material for demanding components that will undergo forging, machining, and subsequent heat treatment (normalizing, quenching & tempering), particularly suited for applications requiring maximum strength and abrasion resistance in this size range. **Key Features & Advantages** * **Very High Strength and Exceptional Hardenability:** The combination of high carbon and manganese provides deep and uniform hardenability, enabling full through-hardening of this diameter range to achieve very high tensile and yield strength after proper heat treatment. * **Good Wear and Abrasion Resistance:** In the hardened and tempered condition, it offers excellent resistance to surface wear, making it suitable for components in sliding or rolling contact under high stress. * **Good Toughness Balance:** When properly tempered, it can achieve a usable balance of strength and impact resistance for many demanding applications, though toughness is lower than lower-carbon alloy steels at equivalent hardness. * **Excellent Forgeability:** Highly suitable for hot forging operations. The manganese improves high-temperature workability, making it a preferred stock for high-strength forged parts like tools and implements. * **Cost-Effective Ultra-High-Strength Material:** Provides a performance level that can approach or exceed some low-alloy steels (e.g., 4140) in terms of hardness and strength at a typically lower material cost, making it economical for wear-intensive applications. --- ### **1. Chemical Composition (Standard Conformance)** | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.44 – 0.52 | **High carbon content.** Primary source of hardness, strength, and wear resistance. Enables formation of high-carbon martensite. | | **Manganese (Mn)** | 1.40 – 1.70 | **Primary Alloying Element.** Dramatically increases hardenability, ensuring deep hardening of this section size. Contributes significantly to strength and promotes a fine grain structure. | | **Phosphorus (P)** | ≤ 0.040 (max) | Residual element, kept very low to maintain toughness. | | **Sulfur (S)** | ≤ 0.050 (max) | Residual element, kept low. **This is not a free-machining steel.** | | **Silicon (Si)** | 0.15 – 0.35 | Deoxidizer; contributes to strength. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G15480 * **AISI/SAE:** 1548 * **ASTM:** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought) * **ASTM:** A519 (for mechanical tubing) * **DIN (Germany):** No direct equivalent. Similar to a modified C55 (1.1203) with high Mn. * **EN (Europe):** No direct equivalent. * **JIS (Japan):** No direct equivalent; similar to a higher-carbon version of SMn445. --- ### **2. Typical Physical & Mechanical Properties (Hot Rolled, As-Rolled Condition, 19-32 mm)** *Note: These are typical properties in the as-supplied state. Final service properties are developed through heat treatment.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Tensile Strength** | 670 – 850 MPa (97 – 123 ksi) | | **Yield Strength (0.2% Offset)** | 420 – 620 MPa (61 – 90 ksi) | | **Elongation (in 50mm)** | 14% – 19% | | **Reduction of Area** | 35% – 50% | | **Brinell Hardness (HB)** | 210 – 270 | | **Machinability (As-Rolled)** | **Very Poor (~25-30% of AISI 1212).** Machining in this state is extremely difficult; normalizing or annealing prior to any significant machining is **essential**. | | **Surface Condition** | Standard hot-rolled finish with mill scale. | --- ### **3. Product Applications** AISI 1548 hot rolled rounds in this size range are used for ultra-high-strength, wear-resistant components subject to severe service. * **High-Stress Shafts and Axles:** Drive shafts, axle shafts, and roller shafts in heavy machinery that will be through-hardened for maximum strength and fatigue resistance. * **Forged Components for Tools and Implements:** Forged lever arms, pry bars, wrench blanks, and other high-strength tools. * **Wear-Resistant Parts:** Plow shares, scraper blades, bucket teeth, crusher liners, mill hammers, and other mining/agricultural components subject to severe abrasion. * **Gears and Sprockets:** Heavy-duty gears and sprockets that are through-hardened for wear resistance where case hardening is not required. * **High-Strength Fasteners and Pins:** Very large bolts, studs, and pins requiring extreme tensile strength, often used in the oil & gas or heavy construction industries. * **General High-Wear Machine Parts:** Guide rails, wear plates, and mandrels. --- ### **4. Critical Considerations** * **Not a Free-Machining Steel:** Contains low sulfur. Machining in the as-rolled state is **prohibitively difficult**. **Normalizing or full annealing prior to any machining is mandatory** for practical production. * **Heat Treatment is Mandatory for Service:** This steel derives its value from heat treatment. It requires quenching & tempering to achieve its ultra-high-strength properties. **Immediate and proper tempering after quenching is absolutely critical** to relieve stresses, prevent cracking, and develop required toughness. * **High Quenching Sensitivity:** Due to its high carbon content, it is **highly susceptible to quench cracking**. Proper quenchant selection (typically oil, sometimes polymer), controlled agitation, and favorable part geometry (avoid sharp corners) are vital. Water quenching is generally not recommended due to extreme cracking risk. * **Toughness Consideration:** While strong and hard, its impact toughness is limited compared to alloy steels like 4140 at similar hardness levels. It is best suited for applications dominated by **compressive loads, abrasion, and controlled stress** rather than severe, unconstrained impact. * **Weldability:** **Very Poor. Not recommended for welding.** If absolutely unavoidable, it requires extensive preheating (350-450°C / 660-840°F), low-hydrogen electrodes, stringent interpass temperature control, and a controlled post-weld heat treatment (PWHT) cycle. The risk of hydrogen-induced and solidification cracking in the HAZ is very high. * **Comparison to 1048/1050:** AISI 1548 offers vastly superior hardenability and strength. * **Comparison to 4140/4340:** 1548 can achieve similar or higher hardness but generally has lower toughness, impact resistance, and tempering stability. 1548 is more economical for wear parts; 41xx/43xx steels are superior for high-integrity structural components. --- **Disclaimer:** **AISI 1548 is a specialized, high-performance steel that requires expert knowledge in heat treatment and machining.** The information provided is based on standard specifications. Actual properties may vary. This material is not suitable for general fabrication. For engineering applications, always consult certified material test reports and conduct thorough process validation. The as-rolled condition is suitable only for hot working or as stock for controlled thermal and mechanical processing. -:- For detailed product information, please contact sales. -: AISI 1548 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <5046 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, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 1548 Steel, hot rolled, 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 1517 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