AISI 1144 Steel Seamless tube

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

AISI 1144 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1144 Steel, Cold-Drawn Round Bar (19-32 mm / 0.75-1.25 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 **19-32 mm (0.75-1.25 in)**. The cold-drawing process involves pulling the hot-rolled bar through a die at room temperature, which significantly improves dimensional accuracy, surface finish, and mechanical properties. This results in a premium-grade material that offers superior machinability, exceptional yield strength, and excellent wear resistance in a ready-to-use condition, often eliminating the need for further heat treatment. **Key Features & Advantages** * **Enhanced Strength & Hardness:** The cold-working process (strain hardening) substantially increases tensile and yield strength, as well as surface hardness, compared to the hot-rolled condition. * **Superior "Stress-Proof" Performance:** Delivers very high yield strength (typically exceeding 100 ksi / 690 MPa), providing outstanding resistance to deformation under load and excellent dimensional stability for precision components. * **Excellent Machinability:** Despite its high strength, the engineered sulfur and phosphorus content ensures good chip-breaking characteristics, leading to good surface finishes and extended tool life during machining. * **Precise Dimensions & Superior Finish:** Cold drawing produces tight diameter tolerances, improved straightness, and a smooth, bright surface finish, reducing the need for secondary finishing operations. * **Ready-to-Use Condition:** Provides an optimal balance of properties directly from the supplier, minimizing additional processing costs and lead times for manufacturers. --- **1. Chemical Composition (Standard Conformance)** The fundamental chemistry of AISI 1144, optimized for free-machining and strength, remains unchanged from the hot-rolled form. | 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, boosting yield strength and improving machinability. | | **Sulfur (S)** | 0.24 – 0.33 | Primary free-machining additive; forms abundant manganese sulfide (MnS) inclusions for effective 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) * **DIN (Germany):** 44S20 (Similar, but P/S levels may differ) * **EN (Europe):** (No direct equivalent; 44S20 is similar) * **Common Brand Names:** "Stressproof"® (LaSalle Steel), 1144 CD. --- **2. Typical Physical & Mechanical Properties (Cold-Drawn Condition)** *Note: Properties are typical for cold-drawn rounds in the specified diameter range and reflect the significant effects of strain hardening.* | 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) – **Good**, considering its high strength. | | **Tensile Strength** | 760 – 895 MPa (110 – 130 ksi) | | **Yield Strength (0.2% Offset)** | **690 – 825 MPa (100 – 120 ksi)** – **A key defining characteristic.** | | **Elongation (in 50mm)** | 10% – 15% | | **Reduction of Area** | 30% – 45% | | **Brinell Hardness (HB)** | 229 – 285 | | **Surface Finish (Ra)** | 3.2 μm (125 μin) or better, typically smooth and bright. | | **Tolerances** | Meets ASTM A108 cold-drawn tolerances, which are significantly tighter than hot-rolled standards. | --- **3. Product Applications** AISI 1144 cold-drawn rounds are the material of choice for high-performance, precision-machined components that require inherent strength, stability, and a fine surface finish without post-draw heat treatment. * **Precision Shafting:** Lead screws, drive shafts, axle shafts, spindles, and piston rods where high strength, straightness, and smooth finish are critical. * **High-Stress Fasteners:** Bolts, studs, pins, and dowels subject to significant tensile and shear loads. * **Automotive & Aerospace Components:** Landing gear parts, steering system components, valve bodies, and other high-integrity parts. * **Hydraulic & Pneumatic Components:** Cylinder rods, plungers, and valve spools requiring wear resistance and a good surface seal. * **Tooling & Machinery Parts:** Shafts for gears and couplings, ejector pins, drill bushings, and fixture components that demand dimensional stability under load. * **General High-Strength Parts:** Any component where the combination of "ready-to-machine" high strength, good finish, and tight tolerances reduces total manufacturing cost. --- **4. Important Considerations** * **Anisotropic Properties:** Mechanical properties may exhibit slight directionality (anisotropy) due to the cold-drawing process, being marginally higher in the longitudinal direction. * **Residual Stress:** The cold-working process introduces residual surface stresses, which generally contribute to good fatigue resistance but may cause distortion if material is asymmetrically removed during heavy machining. Stress-relieving is recommended for complex, unbalanced machining. * **Not for Welding:** The high sulfur and phosphorus content makes AISI 1144 **generally unsuitable for fusion welding**, as it is highly prone to hot cracking and severe weld embrittlement. * **Comparison to Hot-Rolled:** Offers higher strength, better finish, and tighter tolerances but with slightly reduced ductility and machinability rating. * **Further Processing:** Can be annealed to soften for severe forming operations, or heat-treated (quenched & tempered) for applications requiring even higher strength levels. -:- For detailed product information, please contact sales. -: AISI 1144 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4985 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, cold drawn, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 1144 Steel Seamless tube, 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 1456 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