AISI 1132 Steel, hot rolled and cold drawn

AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) Product Information -:- For detailed product information, please contact sales. -: AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1132 Steel, Hot Rolled and Cold Drawn Round Bar (< 16 mm / 0.625 in)** **Overview** AISI 1132 steel supplied as both hot rolled and cold drawn round bar in diameters less than 16 mm represents a versatile free-machining steel in its most commonly used small-diameter forms. This rephosphorized and resulfurized medium-carbon steel is specifically engineered for superior machinability in high-volume production environments. The product is available in two distinct conditions: the economical hot-rolled state with mill scale, and the premium cold-drawn state with enhanced dimensional accuracy, surface finish, and strength. Both forms leverage the inherent chemistry of 1132 to deliver exceptional chip formation and tool life, making them indispensable for manufacturing small, complex components. --- #### **1. Chemical Composition (Nominal, Weight %)** The composition is precisely controlled to achieve the optimal balance of free-machining characteristics and mechanical strength. | Element | Carbon (C) | Manganese (Mn) | **Phosphorus (P)** | **Sulfur (S)** | Silicon (Si) | Iron (Fe) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content (%)** | 0.27 - 0.34 | 1.35 - 1.65 | **0.040 - 0.090** | **0.080 - 0.130** | 0.15 - 0.35 | Balance | * **Primary Role of Elements:** * **Carbon (0.27-0.34%):** Provides core strength and enables surface hardening (e.g., carburizing). The moderate level optimizes machinability while retaining useful mechanical properties. * **Manganese (1.35-1.65%):** **Critical for machinability.** The elevated manganese combines with sulfur to form soft, elongated **manganese sulfide (MnS) inclusions** that act as internal chip breakers and lubricants during cutting. * **Phosphorus (0.040-0.090%):** Intentionally added to strengthen the ferrite matrix and promote chip brittleness, further enhancing machinability. * **Sulfur (0.080-0.130%):** The key free-machining additive. Forms MnS inclusions, which are the primary mechanism for the grade's superior cutting performance. --- #### **2. Physical & Mechanical Properties by Condition** | Property | Hot Rolled (HR) Condition | Cold Drawn (CD & Stress Relieved) Condition | | :--- | :--- | :--- | | **Hardness** | ~155-190 HB (82-90 HRB) | ~170-210 HB (84-94 HRB) | | **Tensile Strength** | 540 - 690 MPa (78 - 100 ksi) | 620 - 750 MPa (90 - 109 ksi) | | **Yield Strength** | 310 - 450 MPa (45 - 65 ksi) | **515 - 655 MPa (75 - 95 ksi)** | | **Elongation (in 50mm)** | 15% - 22% | 12% - 18% | | **Machinability** | **Excellent (~80-90%)** | **Superior (~85-95%)** | | **Surface Finish** | Mill scale surface (dark, rough). | Bright, smooth, scale-free. | | **Dimensional Tolerance** | Wide commercial tolerances. | Tight, precise tolerances (ideal for automatic feeders). | | **Key Trait** | **Most economical raw stock.** | **Premium, ready-to-machine precision stock.** | * **General Notes:** Machinability is rated relative to AISI 1212 steel (100%). Both forms exhibit **excellent chip breakage, low cutting forces, and extended tool life**. The cold-drawn condition offers improved strength and consistency. --- #### **3. Manufacturing Process & Product Forms** * **Hot Rolled (<16mm):** Produced by hot rolling billets into small diameter rounds (often referred to as "wire rod" or "hot rolled bar"). Final form has a characteristic oxide scale. It is the **lowest-cost option** and is often used as feedstock for cold drawing or for less critical parts. * **Cold Drawn (<16mm):** Hot-rolled stock is cleaned (pickled) and drawn at room temperature through a die. This **cold works** the material, increasing strength, improving surface finish, and tightening tolerances. It is typically supplied in straight lengths, **stress-relieved** for stability. This is the **primary form used in automatic screw machines and CNC lathes**. --- #### **4. Product Applications** This small-diameter 1132 is a staple in high-volume manufacturing of precision mechanical parts. * **Automatic Screw Machine Parts:** The quintessential application. Used to produce a vast array of small, complex components like shafts, pins, bushings, fittings, and fasteners on Swiss-type and multi-spindle automatics. * **Fasteners:** Small bolts, screws, nuts, studs, and specialty threaded components requiring good strength and excellent manufacturability. * **Automotive Components:** Fuel injection parts, sensor housings, small gears (for subsequent carburizing), linkage pins, and various under-hood and transmission components. * **Consumer Goods & Hardware:** Components for power tools, appliances, locks, and plumbing fixtures. * **Electrical & Drive Components:** Small motor shafts, connector parts, and drive pins. * **General Engineering:** Any small part requiring extensive drilling, turning, and threading where material cost and machining speed are critical. --- #### **5. Relevant International Standards** This free-machining grade is recognized under various international designations, though exact equivalents may vary. * **ASTM (USA):** * **ASTM A29/A29M:** For hot-wrought bars. * **ASTM A108:** For cold-finished bars (primary spec for cold drawn). * **ASTM A510:** For general requirements for wire rods. * **SAE (USA - Automotive):** **SAE J403, J412** (Grade 1132). * **UNS (Unified Numbering System):** **G11320** * **ISO (International):** * **ISO 683-18:** Heat-treatable steels... Part 18. Similar free-machining types. * **ISO 16120-4:** Wire rod for conversion to wire. * **DIN (Germany):** **DIN EN 10087:** Free-cutting steels. (Closest: **11SMn30**, **1.0715**). * **JIS (Japan):** **JIS G4804:** Free-cutting steels (Similar to **SUM 32**). * **BS (UK):** **BS 970-1:** 212M32 (Historical). --- #### **6. Key Advantages & Considerations** * **Advantages:** * **Unrivaled Machinability:** Drastically reduces cycle times, improves surface finish, and lowers tooling costs. * **Economic Efficiency (HR):** Hot-rolled form provides the cheapest cost per pound for raw material. * **Production Precision (CD):** Cold-drawn form offers the dimensional consistency required for high-speed, unattended machining. * **Good Strength-to-Machinability Ratio:** Offers better mechanical properties than low-carbon free-machining grades like 12L14. * **Considerations:** * **Directional Properties (Anisotropy):** Ductility and impact toughness are much lower across the bar (transverse) than along it (longitudinal) due to MnS stringers. **Parts must be designed with loading direction in mind.** * **Not Weldable:** High sulfur and phosphorus make it **extremely prone to hot cracking**. Welding is **not recommended**. * **Limited to Case Hardening:** Suitable for carburizing/carbonitriding but **not recommended for through-hardening** (quenching & tempering) due to risk of distortion and poor transverse properties. * **Surface Scale (HR):** Hot-rolled material requires descaling (pickling, shot blasting) before many finishing processes. --- **Summary:** AISI 1132 in small diameters (<16mm) is the **engineered solution for cost-effective, high-volume machining**. The choice between **hot-rolled** and **cold-drawn** hinges on the precision and surface finish requirements of the final part versus initial material cost. It is the material of choice for manufacturers who prioritize **minimizing machining time and cost per part** above all else, accepting the trade-offs in weldability and directional toughness. This grade is a fundamental pillar of mass production in the automotive, fastener, and general precision engineering industries. -:- For detailed product information, please contact sales. -: AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) Specification Dimensions Size： Diameter 20-1000 mm Length <6117 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 1132 Steel, hot rolled and cold drawn round (<16 mm) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) -:- For detailed product information, please contact sales. -:

Packing of AISI 1132 Steel, hot rolled and cold drawn round (<16 mm) -:- 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 2588 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