AISI 1141 Steel, hot rolled

AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ## **Product Data Sheet: AISI 1141 Steel, Hot Rolled Round Bar (19-32 mm / 0.75-1.25 in)** --- ### **1. Product Overview** **AISI 1141** is a medium-carbon, **manganese-enhanced, resulfurized free-machining steel** supplied in the standard **hot rolled** condition. Characterized by its **elevated manganese content (1.35-1.65%) and controlled sulfur addition**, this grade offers a superior combination of free-machining characteristics, good mechanical strength, and excellent hardenability compared to standard resulfurized grades like 1140. Supplied as **hot rolled round bar** in the **19 mm to 32 mm (0.75 in to 1.25 in)** diameter range, this product represents the most economical form of AISI 1141, featuring a characteristic **mill scale** surface and commercial dimensional tolerances. It is engineered for components that require **significantly improved machinability over non-resulfurized steels** and benefit from the enhanced hardenability provided by the higher manganese content, making it particularly suitable for parts that will undergo heat treatment after machining. **Key Characteristics of Hot Rolled AISI 1141:** * **Excellent Machinability:** The sulfur addition (0.08-0.13%) provides effective chip breaking, reduced cutting forces, and improved surface finish, leading to faster machining cycles and extended tool life. * **Enhanced Hardenability:** The high manganese content (1.35-1.65%) provides significantly better through-hardening capability than standard carbon steels, allowing for effective heat treatment of larger sections. * **Good Hot Workability:** An excellent choice as feedstock for hot forging operations, with good ductility at high temperatures. * **Cost-Effective Versatility:** As a hot-rolled product, it offers an economical balance of properties for both direct use and as a pre-form for further processing. --- ### **2. Chemical Composition (Standard % by Weight)** The composition is optimized for machinability, strength, and superior hardenability. | Element | Content (%) | Function & Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.37 - 0.45 | Provides core strength and is essential for response to hardening treatments. | | **Manganese (Mn)** | 1.35 - 1.65 | **Key Hardenability Element.** Significantly increases depth and uniformity of hardening. Combines with sulfur to form manganese sulfide (MnS) inclusions. | | **Phosphorus (P)** | ≤ 0.040 | Residual element, controlled to maintain toughness. | | **Sulfur (S)** | 0.08 - 0.13 | **Machinability Enhancer.** Forms MnS inclusions that act as chip breakers, improving machinability but slightly reducing transverse ductility. | | **Iron (Fe)** | Balance | Base metal. | --- ### **3. Typical Physical & Mechanical Properties (Hot Rolled Condition)** *Properties are as-rolled and can vary based on the mill's finishing temperature and cooling practice. The presence of mill scale is standard.* | Property | Typical Value (Metric) | Typical Value (Imperial) | | :--- | :--- | :--- | | **Tensile Strength** | 570 - 720 MPa | 83,000 - 104,000 psi | | **Yield Strength (0.2% Offset)** | 430 - 580 MPa | 62,000 - 84,000 psi | | **Elongation (in 50 mm / 2 in)** | 18% - 24% | 18% - 24% | | **Reduction of Area** | 40% - 55% | 40% - 55% | | **Hardness** | 179 - 229 HB | 179 - 229 HB | | **Surface Condition** | **Mill Scale** | Dark, oxidized layer from hot rolling. | | **Dimensional Tolerance** | **Commercial** | Per standards like ASTM A29. | | **Machinability Rating** | **~ 75-80%** (AISI 1212 = 100%) | Good; superior to non-resulfurized grades of similar carbon content. | --- ### **4. International Standards & Cross-References** Hot rolled AISI 1141 conforms to standard specifications for hot-rolled carbon steel bars. | Standard System | Equivalent Designation | Applicable Specification | | :--- | :--- | :--- | | **ASTM / AISI (USA)** | AISI 1141 | **ASTM A29** (Standard Specification for Steel Bars, Carbon) | | **SAE (USA)** | SAE 1141 | SAE J403, J412 | | **UNS (USA)** | G11410 | - | | **DIN (Germany)** | **1.0726** (35S20)* | DIN 1651-1 / EN 10087 | *Note: Mn content differs; 1.0726 has ~1.00% Mn | | **BS (UK)** | **216M36** (similar) | BS 970 | Similar properties; exact match requires review. | | **JIS (Japan)** | - | No direct common equivalent. | --- ### **5. Primary Applications** Hot rolled AISI 1141 is selected as a versatile raw material for parts requiring good machinability and excellent response to heat treatment. * **Machined & Heat-Treated Components:** Shafts, gears, pins, and studs that are machined from bar stock and subsequently quenched and tempered for high strength. * **Forging Blanks:** An excellent feedstock for hot forging into components like connecting rods, levers, and tool heads that will be heat treated. * **Automotive Parts:** Transmission shafts, gear blanks, crankshafts (for some applications), and other stressed components. * **Fastener Stock:** Used for manufacturing high-strength bolts and fasteners, often after cold drawing or heat treatment. * **Agricultural & Industrial Machinery:** Wear parts, axle shafts, and pins that will be induction or flame hardened. * **General Engineering:** Components requiring a balance of machinability, strength, and hardenability. --- ### **6. Processing Notes** * **Heat Treatment:** **Excellent candidate for quenching and tempering.** The high manganese content provides good hardenability. Typical process: Austenitize at 830-850°C (1525-1560°F), quench in oil (water for simple shapes), and temper to desired hardness (typically 25-40 HRC). Also very suitable for **induction or flame hardening**. * **Machining:** **Good machinability.** The sulfur content provides chip-breaking action. Use sharp, robust tools with adequate coolant. Pre-normalizing can improve machinability consistency for complex parts. * **Weldability:** **Poor.** The combination of medium carbon and sulfur increases susceptibility to heat-affected zone cracking. Welding is not recommended for critical applications. If necessary, use low-hydrogen electrodes with thorough pre-heat (200-300°C) and post-weld heat treatment. * **Surface Preparation:** **Mill scale must be removed** prior to precision machining, heat treatment, or plating. Methods include shot blasting, pickling, or turning. * **Cold Forming:** Fair ductility allows for moderate bending. For severe cold forming, an annealing treatment is recommended. --- ### **7. Key Differentiators from Similar Grades** * **vs. AISI 1140:** AISI 1141 has **significantly higher manganese** (1.35-1.65% vs. 0.70-1.00%), giving it much better hardenability. Sulfur content is similar. * **vs. AISI 1144:** Both have high manganese. AISI 1144 has **much higher sulfur** (0.24-0.33%), giving it superior machinability but worse transverse properties and weldability. * **vs. AISI 1041:** AISI 1041 has no sulfur addition, resulting in poorer machinability but better weldability and isotropic properties. --- **Disclaimer:** The information provided is for general reference. Properties and surface condition can vary between manufacturing lots. The material exhibits anisotropic behavior typical of resulfurized steels. For critical applications, testing of the specific material and consultation with the supplier is recommended. Always consult the relevant Safety Data Sheets (SDS) and material certifications before use. -:- For detailed product information, please contact sales. -: AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4975 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, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1141 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1141 Steel, hot rolled, 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 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 1446 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