AISI 1144 Steel, as cold drawn

AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1144 Steel, Cold Drawn Round Bar (16-22 mm / 0.625-0.875 in)** **Overview** AISI 1144 is a high-strength, medium-carbon "stress-proof" free-machining steel. This specific product is supplied as a **cold drawn round bar** in the diameter range of **16-22 mm (0.625-0.875 in)**. The cold drawing process involves pulling the hot-rolled bar through a precision die at room temperature, resulting in a material that delivers a superior combination of strength, dimensional accuracy, surface finish, and machinability. This medium-small diameter product is the optimal form of 1144 for high-precision, high-volume machining of components that require exceptional "ready-to-use" strength and stability without subsequent heat treatment. **Key Features & Advantages** * **Superior "Stress-Proof" Strength:** The cold working process significantly elevates the already high yield strength inherent to AISI 1144, achieving a minimum yield strength typically in the range of 100-120 ksi (690-825 MPa) directly from the bar. * **Excellent Machinability:** Despite its high strength, the elevated sulfur content ensures the formation of plentiful manganese sulfide inclusions that produce short, brittle chips, enabling excellent surface finishes and extended tool life during high-speed machining. * **Exceptional Dimensional Precision and Surface Quality:** Cold drawing provides tight diameter tolerances (per ASTM A108), superior straightness, and a bright, smooth, scale-free surface finish. This reduces secondary operations and ensures reliable performance in automated feeding systems. * **High Dimensional Stability:** The "stress-proof" nature of the steel, combined with the uniform cold work, provides excellent resistance to deformation under load, making it ideal for precision parts. * **Cost-Effective Production:** Delivers near-net-shape precision and high strength in a single operation, eliminating the costs and lead times associated with heat treatment for many applications. --- **1. Chemical Composition (Standard Conformance)** The chemistry is specifically engineered to provide both high strength and free-machining characteristics. | 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 | Enhances hardenability and strength, and combines with sulfur. | | **Phosphorus (P)** | 0.04 – 0.09 | Strengthens the ferrite matrix, significantly boosting the "stress-proof" yield strength and improving machinability. | | **Sulfur (S)** | 0.24 – 0.33 | **Primary free-machining additive.** Forms abundant manganese sulfide (MnS) inclusions for superior chip breaking. | | **Silicon (Si)** | 0.15 – 0.35 | Acts as a deoxidizer and strengthens ferrite. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G11440 * **ASTM:** A108 (Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished) * **SAE:** J403, J412 (SAE 1144) * **Common Brand Names:** "Stressproof"® (LaSalle Steel), 1144 CD. --- **2. Typical Physical & Mechanical Properties (Cold Drawn Condition, 16-22 mm)** *Note: Properties reflect the significant strain hardening from cold drawing in this size range.* | 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)** | **~75-80%** (Based on 100% for AISI 1212) – **Very Good** for its high-strength category. | | **Tensile Strength** | 760 – 895 MPa (110 – 130 ksi) | | **Yield Strength (0.2% Offset)** | **690 – 860 MPa (100 – 125 ksi)** – **Key distinguishing feature.** | | **Elongation (in 50mm)** | 10% – 16% | | **Reduction of Area** | 30% – 45% | | **Brinell Hardness (HB)** | 229 – 285 | | **Surface Roughness (Ra)** | 2.5 – 5.0 μm (100 – 200 μin). Very smooth, bright, commercial finish. | | **Tolerances** | Meets ASTM A108 cold-drawn tolerances for precision machining. | --- **3. Product Applications** AISI 1144 cold drawn rounds in the 16-22 mm range are the industry standard for high-performance, precision-machined components requiring inherent strength and stability. * **Precision Shafting:** Lead screws, drive shafts, spindle shafts, and piston rods in automation, robotics, and machinery. * **High-Strength Fasteners:** Critical bolts, studs, pins (dowel pins, hinge pins, clevis pins), and threaded rods where the material's as-drawn strength meets or exceeds the requirements of Grade 8 or similar fasteners. * **Hydraulic and Pneumatic Components:** Valve spools, plungers, and small cylinder rods requiring wear resistance and a good sealing surface. * **Automotive Components:** Transmission shafts, steering components (tie rods, rack pins), and high-stress engine or drivetrain parts. * **Tooling and Fixtures:** Drill bushings, ejector pins, guide rods, and fixture components that must resist deflection under load. * **General High-Strength Parts:** Gears, couplings, and bushings for power transmission applications. --- **4. Important Considerations** * **Anisotropy:** Mechanical properties exhibit directionality due to cold working. Longitudinal strength and ductility are superior to transverse properties. * **Residual Stress:** The cold drawing process introduces significant residual surface stresses. For parts undergoing complex, non-uniform machining (e.g., deep off-center holes, keyways), a **stress-relieving heat treatment prior to final machining is highly recommended** to prevent distortion. * **Weldability:** **NOT RECOMMENDED FOR FUSION WELDING.** The high sulfur and phosphorus content make it extremely prone to hot cracking and severe weld embrittlement. * **Cold Forming:** Limited cold formability due to high strength. For severe forming, annealing may be required. * **Comparison to Hot-Rolled:** Offers superior strength, much better surface finish, tighter tolerances, and improved straightness. It is the premium, ready-for-precision-machining form of AISI 1144. -:- For detailed product information, please contact sales. -: AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4993 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 cold drawn, 16-22 mm (0.625-0.875 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1144 Steel, as cold drawn, 16-22 mm (0.625-0.875 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 1464 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