AISI 1117 Steel, normalized

AISI 1117 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: AISI 1117 Steel, normalized at 900°C (1650°F) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1117 Steel, normalized at 900°C (1650°F) Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1117 Steel - Normalized at 900°C (1650°F)** #### **1. Overview: A Standardized Pre-Processing Condition** This datasheet describes **AISI 1117 free-machining steel in a normalized condition**, achieved by heating to 900°C (1650°F) followed by air cooling. Normalization is a critical preparatory heat treatment for this grade, designed to **homogenize the microstructure, refine the grain size, and relieve internal stresses** inherited from prior hot rolling or forging. For AISI 1117, this process ensures a more uniform distribution of the manganese sulfide (MnS) inclusions and a consistent ferritic-pearlitic structure, which leads to **improved machinability, better dimensional stability during subsequent operations, and a more predictable response to case hardening**. This condition represents the ideal, controlled starting state for precision manufacturing. --- #### **2. Chemical Composition (AISI/SAE Standard)** | Element | Content (%) | | :--- | :--- | | **Carbon (C)** | 0.14 - 0.20 | | **Manganese (Mn)** | **1.00 - 1.30** | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | **0.08 - 0.13** | | **Iron (Fe)** | Balance | --- #### **3. Physical & Mechanical Properties (Normalized Condition)** *Properties are for material after normalization and air cooling. Section size affects cooling rate and final properties.* | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Normalized (Austenitized at 900°C, Air Cooled) | | **Microstructure** | **Fine, Uniform Ferrite + Pearlite** with well-dispersed globular MnS inclusions. | | **Hardness** | **143 - 183 HB** (Brinell) | | **Tensile Strength** | **460 - 585 MPa (67 - 85 ksi)** | | **Yield Strength (0.2% Offset)** | **275 - 380 MPa (40 - 55 ksi)** | | **Elongation (in 50 mm)** | **~ 28 - 35%** | | **Grain Size** | **Refined (ASTM 7-9)**, eliminating the coarse, uneven structure of as-rolled material. | | **Machinability** | **Excellent and More Consistent.** The uniform, fine-grained structure and evenly distributed MnS inclusions provide predictable chip formation, excellent surface finish, and extended tool life compared to the as-rolled state. | | **Internal Stress** | **Low.** The thermal cycle effectively relieves residual stresses from prior working, reducing the risk of distortion during machining. | | **Dimensional Stability** | **Very Good.** Ideal for holding tight tolerances during precision machining. | | **Response to Case Hardening** | **Optimized.** The homogeneous microstructure allows for uniform carbon diffusion during carburizing, leading to a consistent case depth and hardness profile. | --- #### **4. Key Characteristics & Metallurgical Purpose** * **Microstructure Homogenization:** Heating above the Ac3 temperature fully austenitizes the steel, dissolving carbides and homogenizing the alloying elements. Upon air cooling, a new, fine, and uniform ferrite-pearlite structure forms. * **Stress Relief and Grain Refinement:** Eliminates the banded, stressed structure from rolling, creating a stable and isotropic material with refined grains for better toughness and consistency. * **Preparation for Critical Processing:** This is the **primary purpose**. Normalization is a highly recommended step before: * **Precision Machining:** Ensures uniform cutting forces and minimizes distortion. * **Case Hardening (Carburizing):** Provides a consistent starting condition for predictable and repeatable case depth and core properties. * **Not a Final Service Condition:** The properties are insufficient for high-stress or wear applications without subsequent case hardening or other treatment. --- #### **5. Typical Applications** **Primarily as a Preparatory Condition for High-Quality Manufacturing:** * **Pre-Machining Treatment for Gears and Shafts:** Standard practice for **transmission gears, pinions, and drive shafts** that will be machined to precise tolerances before carburizing. * **Stock for Critical Machined Components:** Used for parts requiring excellent dimensional stability and surface finish from machining, such as **precision fittings, valve bodies, and bearing races**. * **Post-Forging Treatment:** Applied to **forged components** (e.g., lever arms, yokes) to refine the coarse forged grain structure before final machining and heat treatment. * **Base Material for Further Cold Working:** Provides a uniform and stress-relieved starting condition for severe cold forming or drawing operations. --- #### **6. Relevant International Standards & Specifications** | Standard / Aspect | Relevance | | :--- | :--- | | **Base Material Standard** | **AISI 1117 / SAE J403 / UNS G11170** | | **Heat Treatment Specification** | Commonly specified on engineering drawings as: "Normalize: Heat to 900°C (1650°F), air cool." | | **ASTM A29/A29M** | For the base hot-rolled bar stock. | | **SAE J416** | Standard heat treatment practices for steel. | | **DIN / EN Equivalent** | **1.0715 / 11SMn30**. Normalizing is a standard conditioning option. | --- ### **Critical Processing & Design Considerations** 1. **Section Size Sensitivity:** The cooling rate in air depends on part mass. **Thin sections will be harder and stronger**; **thick sections will be slightly softer**. For very heavy sections, the core properties may not fully achieve those listed. 2. **Decarburization:** Heating to 900°C in an air atmosphere will cause **surface decarburization**. For critical surfaces (e.g., gear teeth), this layer must be removed by subsequent machining, or the process should be performed in a protective/controlled atmosphere. 3. **Immediate Next Steps:** After normalization, parts are typically machined to near-final dimensions and then case hardened. It is not a final condition for service. 4. **Advantage Over As-Rolled:** Normalized 1117 offers superior consistency, machinability, and hardening response compared to as-rolled material, justifying the additional processing step for quality-critical parts. **Summary: AISI 1117 normalized at 900°C represents the standardized, quality-optimized starting condition for manufacturing high-performance components.** It delivers a **uniform microstructure, low stress, and excellent consistency**, which directly translate to **improved machining performance, dimensional accuracy, and reliable case hardening results**. For manufacturers of precision gears, shafts, and other case-hardened parts, this normalization step is a critical investment in product quality, reliability, and manufacturing efficiency. It transforms a commodity steel into a predictable engineering material ready for high-value manufacturing processes. -:- For detailed product information, please contact sales. -: AISI 1117 Steel, normalized at 900°C (1650°F) Specification Dimensions Size： Diameter 20-1000 mm Length <4928 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 1117 Steel, normalized at 900°C (1650°F) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1117 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1117 Steel, normalized at 900°C (1650°F) -:- For detailed product information, please contact sales. -:

Packing of AISI 1117 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 1399 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