AISI 1141 Steel, normalized

AISI 1141 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: AISI 1141 Steel, normalized at 900°C (1650°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1141 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1141 Steel, Normalized at 900°C (1650°F)** **Overview** AISI 1141 is a medium-carbon, resulfurized free-machining steel supplied in a **normalized condition**, specifically heat-treated at **900°C (1650°F)**. Normalization is a critical thermal process that refines the grain structure, homogenizes the microstructure, and enhances the steel's mechanical consistency and machinability. This treatment makes AISI 1141 an ideal candidate for components requiring predictable and improved strength, better dimensional stability during machining, and a uniform response to subsequent heat treatments or surface hardening. **Key Features & Advantages** * **Refined & Uniform Microstructure:** Normalization eliminates coarse grain structures from prior hot-working, resulting in a finer, more uniform pearlitic-ferritic structure. This enhances toughness and reduces property variation. * **Improved Machinability:** A uniform, normalized structure provides more consistent chip formation and reduces tool wear during machining compared to the as-rolled condition. * **Enhanced Mechanical Properties:** Offers a favorable balance of strength, ductility, and toughness, superior to the as-rolled state. * **Stress Relief & Stability:** The process relieves internal stresses, minimizing the risk of distortion during subsequent machining or heat treatment. * **Optimal Preparation for Hardening:** Creates a consistent starting condition for processes like flame or induction hardening, ensuring uniform case depth and hardness. --- **1. Chemical Composition (Standard Conformance)** The chemical composition remains the defining characteristic of AISI 1141, consistent across all conditions. | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.37 – 0.45 | Provides base strength and hardenability. | | **Manganese (Mn)** | 1.35 – 1.65 | Enhances hardenability, strength, and combines with sulfur to form MnS inclusions for machinability. | | **Phosphorus (P)** | ≤ 0.04 | Residual element. | | **Sulfur (S)** | 0.08 – 0.13 | **Free-machining additive.** Forms soft MnS inclusions. | | **Silicon (Si)** | 0.10 – 0.30 | Deoxidizer; contributes to strength. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G11410 * **ASTM:** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished) * **SAE:** J403, J412 (SAE 1141) * **DIN (Germany):** 35S20 / 1.0726 * **EN (Europe):** 35S20 * **JIS (Japan):** SUM43 * **ISO:** 35S20 --- **2. Typical Physical & Mechanical Properties (Normalized at 900°C / 1650°F)** *Note: Properties are typical for normalized condition and can vary slightly based on section size and exact cooling rate.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Modulus of Elasticity** | 200 - 210 GPa (29,000 – 30,500 ksi) | | **Poisson's Ratio** | ~0.29 | | **Thermal Conductivity** | ~51.9 W/m·K (at 100°C) | | **Machinability (Comparison)** | ~80-85% (Based on 100% for AISI 1212) – Very Good. Slightly less than annealed but more consistent. | | **Tensile Strength** | 620 – 750 MPa (90 – 110 ksi) | | **Yield Strength (0.2% Offset)** | 380 – 520 MPa (55 – 75 ksi) | | **Elongation (in 50mm)** | 18% – 22% | | **Reduction of Area** | 35% – 50% | | **Brinell Hardness (HB)** | 187 – 229 | | **Impact Toughness** | Improved over the as-rolled condition due to grain refinement. | | **Microstructure** | Fine, uniform mixture of ferrite and pearlite. | --- **3. Product Applications** AISI 1141 in the normalized condition is specified for components that require a reliable combination of strength, machinability, and consistency, often serving as a superior starting point for critical parts. * **Precision Machined Components:** Gears, shafts, pinions, and spindles that require stable dimensions and good surface finish during high-volume CNC or screw machine production. * **Parts for Subsequent Heat Treatment:** Components like camshafts, piston rods, and lever arms that will undergo surface hardening (flame/induction) or through-hardening (quench & temper), where a uniform starting microstructure is crucial. * **Automotive & Truck Components:** Critical parts such as axle shafts, transmission shafts, and steering components that benefit from the normalized state's improved toughness and fatigue resistance. * **Industrial Machinery Parts:** High-stress pins, dowels, bolts, and hydraulic cylinder rods where predictable mechanical properties are required. * **Tooling & Fixtures:** Jigs, fixtures, and die components that need a stable, strong, and machinable material. --- **4. Heat Treatment Process & Considerations** * **Normalization Process:** The steel is uniformly heated to approximately **900°C (1650°F)** – fully into the austenite phase region – held for sufficient time to achieve temperature uniformity, and then air-cooled in still air. This specific temperature ensures complete austenitization for this chemistry. * **Purpose:** The primary goals are grain refinement, microstructure homogenization, and stress relief. * **Comparison to Annealing:** Normalization produces higher strength and hardness than full annealing but lower than the as-rolled or quenched & tempered states. It offers a good balance for machinability and performance. * **Surface Condition:** Typically supplied with the mill scale removed (by shot blasting or pickling) post-normalization to facilitate inspection and machining. * **Section Size Sensitivity:** Mechanical properties, especially hardness and strength, can vary with the cross-sectional diameter due to differences in cooling rate during air cooling. -:- For detailed product information, please contact sales. -: AISI 1141 Steel, normalized at 900°C (1650°F) Specification Dimensions Size： Diameter 20-1000 mm Length <4982 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 1141 Steel, normalized at 900°C (1650°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1141 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1141 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 1141 Steel, normalized at 900°C (1650°F) -:- 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 1453 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