AISI 1144 Steel, as rolled

AISI 1144 Steel, as rolled Product Information -:- For detailed product information, please contact sales. -: AISI 1144 Steel, as rolled Synonyms -:- For detailed product information, please contact sales. -:

AISI 1144 Steel, as rolled Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1144 Steel, Hot-Rolled (As-Rolled) Condition** **Overview** AISI 1144 is a high-strength, medium-carbon, resulfurized and phosphorized free-machining steel, widely recognized as a "stress-proof" grade. Supplied in the **hot-rolled (as-rolled)** condition, this product represents the most economical and readily available form of the material, directly from the steel mill's rolling process without subsequent heat treatment or cold finishing. The as-rolled state provides a robust combination of good machinability, inherent high yield strength, and excellent wear resistance, making it suitable for a wide range of industrial components that may undergo further machining, forging, or heat treatment. **Key Features & Advantages** * **High As-Rolled Strength:** Naturally achieves a higher yield and tensile strength compared to standard non-resulturized grades (like 1045) in the same condition, often exceeding 85 ksi (586 MPa) yield strength directly from the mill. * **Good Machinability:** The elevated 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 without additional processing. * **Cost-Effective Base Material:** The most economical supply form, ideal for applications where surface finish is not critical or where the material will be fully machined, forged, or heat-treated. * **Good Wear Resistance:** The higher carbon content and as-rolled hardness contribute to better resistance against surface wear. --- **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.** Strengthens the ferrite matrix, significantly boosting the "stress-proof" yield strength and improving machinability. | | **Sulfur (S)** | 0.24 – 0.33 | **Elevated.** Primary free-machining additive; forms abundant manganese sulfide (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) * **Common Brand Names:** Often referred to as "Stressproof"® steel in its processed forms. --- **2. Typical Physical & Mechanical Properties (Hot-Rolled, As-Rolled Condition)** *Note: Properties are for hot-rolled material and can vary based on the final rolling temperature, cooling rate, and section size.* | 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)** | **550 – 690 MPa (80 – 100 ksi)** – **A key distinguishing feature in the as-rolled state.** | | **Elongation (in 50mm)** | 15% – 22% | | **Reduction of Area** | 40% – 55% | | **Brinell Hardness (HB)** | 201 – 255 | | **Surface Condition** | Standard hot-rolled finish with a characteristic dark blue-gray **mill scale** (iron oxide layer). | --- **3. Product Applications** AISI 1144 in the as-rolled condition is a versatile starting material for components requiring strength, stability, and machinability. * **Forging Blanks:** Excellent stock material for hot-forged parts like automotive crankshafts, connecting rods, lever arms, and other high-strength forged components. * **Machined Components:** Shafts, pins, bolts, studs, and gear blanks where the entire surface will be machined away, removing the mill scale. * **Parts for Subsequent Heat Treatment:** Components like axles, spindles, and rollers that will be through-hardened (quenched & tempered) or surface hardened after initial machining. * **General Machinery Parts:** Gears, couplings, cams, and hydraulic component bodies that require machining and inherent strength. * **Agricultural and Off-Road Equipment:** High-stress components like plow beams, pivot pins, and linkage parts. --- **4. Important Considerations** * **Mill Scale:** The surface is covered with a tightly adherent oxide layer (mill scale) which must be removed via pickling, shot blasting, or machining for most finishing operations, painting, or effective welding. * **Weldability:** The high sulfur and phosphorus content makes AISI 1144 **generally not recommended for fusion welding**. It is highly prone to hot cracking and severe weld embrittlement. * **Dimensional Tolerances:** Hot-rolled products have standard commercial tolerances which are wider than those for cold-finished bars. Suitable where dimensions are not critical or will be fully machined. * **Internal Stress:** The as-rolled condition may contain residual thermal stresses from uneven cooling. For critical machining, stress relieving is often recommended prior to final machining. * **Further Processing:** This is the standard feedstock for producing cold drawn, turned, or heat-treated (normalized, annealed, Q&T) AISI 1144 products. -:- For detailed product information, please contact sales. -: AISI 1144 Steel, as rolled Specification Dimensions Size： Diameter 20-1000 mm Length <4997 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, as rolled Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1144 Steel, as rolled -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1144 Steel, as rolled -:- For detailed product information, please contact sales. -:

Packing of AISI 1144 Steel, as rolled -:- 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 1468 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