AISI 1144 Steel, hot rolled

AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1144 Steel, Hot-Rolled Round Bar (19-32 mm / 0.75-1.25 in)** **Overview** AISI 1144 is a high-strength, medium-carbon, resulfurized and phosphorized free-machining steel, widely recognized as a "stress-proof" grade. Supplied as a **hot-rolled round bar** in the diameter range of **19-32 mm (0.75-1.25 in)**, this product offers a unique combination of good machinability, high yield strength, and excellent wear resistance in the as-rolled condition. It is engineered to provide enhanced mechanical properties directly from the mill, reducing or eliminating the need for heat treatment in many applications. **Key Features & Advantages** * **High As-Rolled Strength:** Delivers significantly higher yield and tensile strength compared to standard 1141/1140 grades in the same condition, often exceeding 85 ksi (586 MPa) yield strength. * **Good Machinability:** The controlled sulfur and phosphorus content promotes the formation of chip-breaking inclusions, enabling good machining performance despite its higher strength. * **"Stress-Proof" Characteristics:** Exhibits good resistance to deformation under load and maintains dimensional stability, making it suitable for stressed components. * **Good Wear Resistance:** The higher carbon content and as-rolled hardness contribute to better resistance against surface wear. * **Cost-Effective Performance:** Eliminates heat treatment costs for many applications, providing a ready-to-machine, high-strength material. --- **1. Chemical Composition (Standard Conformance)** The chemistry of AISI 1144 is carefully balanced to achieve its "stress-proof" properties. | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.40 – 0.48 | Provides high core strength, hardness, and wear resistance. | | **Manganese (Mn)** | 1.35 – 1.65 | Increases hardenability, strength, and combines with sulfur. | | **Phosphorus (P)** | 0.04 – 0.09 | **Elevated vs. 1141.** Strengthens the ferrite matrix, contributing significantly to the "stress-proof" yield strength and improving machinability. | | **Sulfur (S)** | 0.24 – 0.33 | **Elevated vs. 1141.** Primary free-machining additive; forms abundant MnS inclusions for excellent chip breaking. | | **Silicon (Si)** | 0.15 – 0.35 | Deoxidizer and strengthens ferrite. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G11440 * **ASTM:** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished) * **SAE:** J403, J412 (SAE 1144) * **DIN (Germany):** 44S20 (Similar, but P/S levels differ) * **EN (Europe):** (No direct equivalent; 44S20 is similar) * **Common Brand Names:** "Stressproof"® (a registered trademark of LaSalle Steel), 1144 SP. --- **2. Typical Physical & Mechanical Properties (Hot-Rolled, As-Rolled Condition)** *Note: Properties are for hot-rolled rounds in the specified diameter range and represent typical as-rolled (non-heat-treated) values.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Modulus of Elasticity** | 200 - 210 GPa (29,000 – 30,500 ksi) | | **Machinability (Comparison)** | ~80% (Based on 100% for AISI 1212) – **Good** for its strength level. | | **Tensile Strength** | 655 – 795 MPa (95 – 115 ksi) | | **Yield Strength (0.2% Offset)** | **586 – 689 MPa (85 – 100 ksi)** – **Key distinguishing feature.** | | **Elongation (in 50mm)** | 12% – 20% | | **Reduction of Area** | 35% – 50% | | **Brinell Hardness (HB)** | 201 – 255 | | **Surface Condition** | Standard hot-rolled finish with mill scale. | --- **3. Product Applications** AISI 1144 hot-rolled rounds are specified for demanding applications requiring a combination of strength, stability, and machinability without post-rolling heat treatment. * **High-Strength Shafts and Spindles:** Drive shafts, axle shafts, conveyor rollers, and machine tool spindles where the as-rolled strength is sufficient. * **Bolts, Studs, and Fasteners:** High-strength fasteners, especially larger diameter ones, where the material's "stress-proof" quality is critical. * **Pins, Dowels, and Bushings:** Wear-resistant pins, hinge pins, and dowel pins subject to shear and bearing stresses. * **Automotive and Off-Highway Components:** Steering components, lever arms, brake system parts, and other stressed linkages. * **General Machinery Parts:** Gears, couplings, cams, and hydraulic component bodies that require machining and inherent strength. * **Tooling and Fixtures:** Jigs, fixtures, and die components where dimensional stability under load is required. --- **4. Important Considerations** * **Mill Scale:** The surface has a characteristic oxide layer (mill scale) which must be removed via pickling, shot blasting, or machining for most finishing operations or for effective welding. * **Not for Welding:** The high sulfur and phosphorus content makes AISI 1144 **generally not recommended for fusion welding**, as it is highly prone to hot cracking and weld embrittlement. * **Cold Working:** Can be cold-drawn to further improve strength, surface finish, and dimensional tolerances (AISI 1144 Cold Drawn or Turned). * **Heat Treatment:** Can be through-hardened (quenched & tempered) for even higher strength or surface hardened. However, its primary value is in its as-rolled "stress-proof" properties. -:- For detailed product information, please contact sales. -: AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4984 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 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1144 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1144 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 1455 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