AISI 1141 Steel, annealed

AISI 1141 Steel, annealed at 815°C (1500°F) Product Information -:- For detailed product information, please contact sales. -: AISI 1141 Steel, annealed at 815°C (1500°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1141 Steel, annealed at 815°C (1500°F) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1141 Steel, Annealed at 815°C (1500°F)** **Overview** AISI 1141 steel in the **annealed at 815°C (1500°F)** condition represents an optimal state for maximum machinability and formability. Annealing is a heat treatment process that involves heating the steel above its critical temperature and then allowing it to cool slowly, typically in the furnace. This specific treatment at 815°C (1500°F) for AISI 1141 results in a soft, ductile microstructure with the lowest possible hardness and the highest degree of dimensional stability, making it the premier choice for complex or extensive machining operations where tool life and surface finish are paramount. **Key Features & Advantages** * **Optimal Machinability:** The annealing process produces the softest possible state for this grade, significantly reducing cutting forces, minimizing tool wear, and enabling the highest feasible machining speeds and feeds. This results in superior surface finish on machined parts. * **Maximum Ductility and Formability:** Offers the greatest elongation and reduction of area, making it suitable for certain cold-forming operations after machining. * **Stress Relief and Homogeneity:** Eliminates internal stresses from prior rolling or forging, ensuring exceptional dimensional stability during and after machining to prevent warping or distortion. * **Uniform Microstructure:** Creates a consistent, coarse pearlitic-ferritic structure that ensures predictable and repeatable machining behavior and mechanical properties throughout the part. * **Ideal Pre-Hardening Condition:** Provides a uniform, stress-free starting condition for subsequent heat treatments like quenching and tempering or surface hardening. --- **1. Chemical Composition (Standard Conformance)** The fundamental chemistry of AISI 1141 remains unchanged and defines its core characteristics. | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | 0.37 – 0.45 | Provides base strength potential. In the annealed state, it contributes to the formation of soft pearlite. | | **Manganese (Mn)** | 1.35 – 1.65 | Enhances hardenability potential and combines with sulfur. In annealing, it aids in forming a uniform microstructure. | | **Phosphorus (P)** | ≤ 0.04 | Residual element. | | **Sulfur (S)** | 0.08 – 0.13 | **Free-machining additive.** Forms soft, globular manganese sulfide (MnS) inclusions that act as chip breakers, a feature fully utilized in the soft annealed state. | | **Silicon (Si)** | 0.10 – 0.30 | Deoxidizer. | | **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 (Annealed at 815°C / 1500°F)** *Note: These properties represent the softest achievable state for AISI 1141. Exact values depend on section size and furnace 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)** | **~90%** (Based on 100% for AISI 1212) – **Excellent.** This is the most machinable condition for this grade. | | **Tensile Strength** | 520 – 620 MPa (75 – 90 ksi) | | **Yield Strength (0.2% Offset)** | 310 – 415 MPa (45 – 60 ksi) | | **Elongation (in 50mm)** | 25% – 32% | | **Reduction of Area** | 50% – 60% | | **Brinell Hardness (HB)** | 156 – 187 | | **Microstructure** | Coarse lamellar pearlite and ferrite (often more spheroidized compared to normalized state), with globular MnS inclusions. | | **Dimensional Stability** | Excellent, due to complete stress relief. | --- **3. Product Applications** AISI 1141 in the annealed condition is specifically selected for applications where extreme machinability, complex part geometry, and minimal post-machining distortion are critical. * **High-Volume Precision Machining:** Complex gears, splined shafts, connectors, and intricate components produced on multi-axis CNC lathes and Swiss-style screw machines, where long tool life and tight tolerances are essential. * **Parts Requiring Extensive Machining:** Components where a large volume of material must be removed; the soft state reduces power consumption and improves cycle times. * **Critical Components for Subsequent Heat Treatment:** Parts like high-performance automotive valve guides, certain firearm components, or precision machinery parts that must be machined to final dimensions pre-hardening. The stable, annealed state prevents distortion during final quenching. * **Thread Rolling and Forming:** Excellent substrate for thread rolling and other cold-forming operations due to its high ductility and uniformity. * **Prototyping and Tooling:** Ideal for machining prototypes, fixtures, jigs, and non-marring tooling where easy machinability is valued over ultimate strength. --- **4. Heat Treatment Process & Considerations** * **Annealing Process:** The steel is heated to **815°C (1500°F)**, held at temperature to achieve full austenitization and chemical homogeneity, and then **slowly cooled inside the furnace** at a controlled rate (often < 25°C/hr through the critical range). This slow cooling allows for the formation of the softest possible microstructure. * **Purpose:** To achieve minimum hardness, maximum ductility, complete stress relief, and a uniform microstructure for optimal machinability. * **Comparison to Other Conditions:** * **vs. As-Rolled:** Softer, more ductile, stress-relieved, and with more consistent properties. * **vs. Normalized:** Softer and more machinable, but with lower strength. Normalized material has finer grains and better toughness. * **vs. Cold Finished:** Softer and more formable, but lacks the superior surface finish, dimensional accuracy, and increased strength from cold working. * **Post-Processing:** After annealing, scale is removed via pickling or blasting. The material is ready for immediate machining and is often the specified condition for purchase when ultimate machinability is the primary driver. -:- For detailed product information, please contact sales. -: AISI 1141 Steel, annealed at 815°C (1500°F) Specification Dimensions Size： Diameter 20-1000 mm Length <4983 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, annealed at 815°C (1500°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1141 Steel, annealed at 815°C (1500°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1141 Steel, annealed at 815°C (1500°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 1141 Steel, annealed at 815°C (1500°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 1454 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