AISI 1118 Steel, normalized

AISI 1118 Steel, normalized 925°C (1700°F) Product Information -:- For detailed product information, please contact sales. -: AISI 1118 Steel, normalized 925°C (1700°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1118 Steel, normalized 925°C (1700°F) Product Information -:- For detailed product information, please contact sales. -: ## **Product Data Sheet: AISI 1118 Steel, Normalized at 925°C (1700°F)** --- ### **1. Product Overview** **AISI 1118, Normalized at 925°C (1700°F)**, is a specific heat-treated condition of this low-carbon, direct-hardening steel. Normalization involves heating the steel above its upper critical transformation temperature (ensuring full austenitization), holding for sufficient time for complete phase transformation and thermal homogenization, followed by cooling in still air. This 925°C treatment temperature is intentionally high for AISI 1118, aimed at fully dissolving carbides and creating a homogeneous austenitic grain structure prior to air cooling, resulting in a uniformly refined and stress-relieved final microstructure. This processing route is specified to establish a **consistent, fine-grained ferrite-pearlite microstructure** with optimized mechanical properties, serving as either a **superior starting condition for further heat treatment (quenching & tempering, case hardening)** or as the final treatment for components requiring a balanced combination of strength, ductility, and toughness. It is the preferred state for critical parts where microstructural uniformity and predictable performance are essential. **Key Advantages of Normalized AISI 1118:** * **Optimal Microstructural Homogeneity & Grain Refinement:** The high austenitizing temperature ensures complete carbide dissolution and uniform austenite, which upon air cooling transforms into a fine, uniform distribution of ferrite and pearlite, enhancing both strength and toughness. * **Maximum Stress Relief & Dimensional Stabilization:** Effectively eliminates internal stresses from prior rolling, forging, or machining, providing a dimensionally stable foundation for subsequent precision machining or final heat treatment, minimizing distortion. * **Enhanced and Consistent Mechanical Properties:** Delivers a reliable and improved balance of tensile strength, yield strength, and ductility compared to the as-rolled condition, with minimal property variation throughout the part. * **Superior Baseline for Further Processing:** Creates the ideal, uniform starting condition for through-hardening (quench & temper) or surface hardening (induction), leading to more predictable hardening response, more uniform case depths, and reduced risk of quench cracking. --- ### **2. Chemical Composition (Standard % by Weight)** The composition adheres to the standard AISI 1118 specification, characterized by higher manganese for hardenability. | Element | Content (%) | Function & Implication in Normalization | | :--- | :--- | :--- | | **Carbon (C)** | 0.14 - 0.20 | Determines the final pearlite content and contributes to strength in the normalized matrix. | | **Manganese (Mn)** | 1.30 - 1.60 | **Critical for Hardenability.** Retards the transformation of austenite to ferrite/pearlite during air cooling, resulting in a finer pearlite structure and higher normalized strength. | | **Phosphorus (P)** | ≤ 0.040 | Residual, kept low to prevent embrittlement. | | **Sulfur (S)** | ≤ 0.050 | **Kept Low.** This ensures good toughness and weldability, distinguishing it from free-machining grades. Low sulfur is beneficial for the normalization process. | | **Iron (Fe)** | Balance | Base metal. | --- ### **3. Typical Physical & Mechanical Properties (Normalized at 925°C / 1700°F)** *Properties are indicative and can vary with section size (cooling rate). The high normalization temperature promotes a finer grain size compared to lower temperatures.* | Property | Typical Value (Metric) | Typical Value (Imperial) | Notes | | :--- | :--- | :--- | :--- | | **Tensile Strength** | 480 - 570 MPa | 70,000 - 83,000 psi | Higher than as-rolled due to grain refinement. | | **Yield Strength (0.2% Offset)** | 345 - 450 MPa | 50,000 - 65,000 psi | Improved yield ratio. | | **Elongation (in 50 mm)** | 22% - 30% | 22% - 30% | Good ductility is maintained. | | **Reduction of Area** | 50% - 65% | 50% - 65% | - | | **Hardness** | 156 - 197 HB | 156 - 197 HB | Uniform hardness due to homogeneous structure. | | **Grain Size** | **Fine, ASTM 7-9** | | Result of high austenitizing temperature and controlled cooling. | | **Microstructure** | **Fine, uniform ferrite with refined pearlite.** | | The target outcome of normalization. | | **Impact Toughness** | **Good** | | Superior to as-rolled due to fine grain and stress relief. | --- ### **4. International Standards & Specifications** Normalization is a standard heat treatment applied to steel meeting common material specifications. | Standard System | Grade Designation | Applicable Base Specification | Heat Treatment Note | | :--- | :--- | :--- | :--- | | **ASTM / AISI (USA)** | AISI 1118 | ASTM A29 / ASTM A108 | Can be supplied normalized per ASTM A29 or as a special requirement. | | **SAE (USA)** | SAE 1118 | SAE J403 | - | | **UNS (USA)** | G11180 | - | - | | **DIN (Germany)** | 1.0725 | DIN 17222 / EN 10263-3 | Can be supplied to "**+N**" condition (Normalized). | | **EN (Europe)** | 1.0725 | EN 10263-3 | - | | **Common Callout** | **Normalized 925°C (1700°F), Air Cool** | | Often specified on engineering drawings for critical parts. | --- ### **5. Primary Applications** This normalized condition is specified for components where a reliable, high-quality microstructure is mandatory for performance or as a precursor to final hardening. * **Critical Forging & Casting Preforms:** Gear blanks, crankshafts, connecting rods, and other forged parts that are normalized post-forging to refine the coarse grain structure before final machining and hardening. * **Precision Gearing and Shafting:** Components destined for **carburizing** or **induction hardening**. Normalization ensures a uniform core structure, leading to predictable case depth and optimal core properties. * **Quench & Temper Pre-Condition:** Parts that will undergo through-hardening. The uniform, stress-relieved normalized state minimizes distortion and quench cracking risk. * **General High-Quality Components:** Bolts, pins, and structural parts requiring better and more consistent mechanical properties than as-rolled stock, where normalization is the final heat treatment. * **Tooling & Machine Components:** Jigs, fixtures, and non-cutting tool parts requiring good strength, stability, and toughness in the "as-machined" state. --- ### **6. Processing & Fabrication Notes** * **Subsequent Heat Treatment:** Serves as the **ideal preparatory treatment for quenching & tempering or case hardening**. The fine, homogeneous austenite achieved at 925°C leads to a more consistent martensitic transformation upon quenching. * **Machinability:** Offers **good and consistent machinability**. The uniform fine-grained structure provides stable cutting, good surface finish, and predictable tool life, superior to as-rolled material. Chip formation is more consistent than in the as-rolled state. * **Weldability:** **Good.** The low sulfur and carbon content, combined with the refined grain structure, make normalized AISI 1118 suitable for welding. Standard pre/post-weld procedures for low-carbon steels apply. * **Cold Working:** More ductile and uniform than in the as-rolled condition, suitable for moderate cold forming. The stress-relieved state reduces the risk of cracking during forming. * **Distortion Control:** The primary benefit for machining. Components exhibit minimal movement during and after machining, which is critical for holding tight tolerances. --- **Disclaimer:** The data provided is for general reference. Final mechanical properties are influenced by section size, which affects the air-cooling rate. For performance-critical applications, consultation with the heat treater and validation through testing of the actual processed material is essential. Always review full material certifications and Safety Data Sheets (SDS) prior to use. -:- For detailed product information, please contact sales. -: AISI 1118 Steel, normalized 925°C (1700°F) Specification Dimensions Size： Diameter 20-1000 mm Length <4941 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 1118 Steel, normalized 925°C (1700°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1118 Steel, normalized 925°C (1700°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1118 Steel, normalized 925°C (1700°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 1118 Steel, normalized 925°C (1700°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 1412 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