AISI 1108 Steel, hot rolled

AISI 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1108 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 1108 Steel, Hot-Rolled Round Bar (19-32 mm / 0.75-1.25 in)** #### **1. Overview** AISI 1108 is a low-carbon, re-sulfurized free-machining steel supplied in the standard hot-rolled condition. In this form, it features a characteristic mill-scaled surface and offers a cost-effective raw material solution for applications where **excellent machinability is the primary requirement**. The elevated sulfur content promotes the formation of manganese sulfide inclusions, which act as internal chip breakers during machining operations. While not as dimensionally precise or as strong as its cold-drawn counterpart, hot-rolled AISI 1108 provides the essential free-machining characteristics at a lower initial cost, making it ideal for high-volume, non-critical component production where surface finish and tight tolerances can be achieved through subsequent machining. --- #### **2. Chemical Composition (AISI/SAE Standard)** | Element | Content (%) | | :--- | :--- | | **Carbon (C)** | 0.08 - 0.13 | | **Manganese (Mn)** | 0.60 - 0.90 | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | **0.08 - 0.13** | | **Iron (Fe)** | Balance | **Key Distinction:** The controlled sulfur range (0.08-0.13%) defines it as a free-machining grade. This is the critical element that improves machinability over non-resulfurized low-carbon steels like 1008 or 1010. --- #### **3. Typical Physical & Mechanical Properties (As-Hot Rolled)** *Properties are for the "black," as-rolled state with mill scale.* | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Hot-Rolled | | **Tensile Strength** | **380 - 480 MPa (55 - 70 ksi)** | | **Yield Strength (0.2% Offset)** | **205 - 310 MPa (30 - 45 ksi)** | | **Elongation (in 50 mm)** | **~ 20 - 28%** | | **Hardness** | **~ 110 - 145 HB** | | **Machinability** | **Very Good (~130-150% of AISI 1212).** The sulfur inclusions provide excellent chip-breaking action, allowing for higher cutting speeds and feeds compared to non-free-cutting steels of similar strength. | | **Surface Finish** | Standard hot-rolled finish with adherent mill scale. Surface must be removed (by machining, pickling, or shot blasting) for final applications. | | **Dimensional Tolerance** | Commercial hot-rolled tolerances. Less precise than cold-drawn product. | | **Cold Formability** | **Good.** The low carbon content provides good ductility for bending and forming operations. | | **Hardenability** | **Very Low.** Not suitable for through-hardening. Can be case hardened via carburizing. | --- #### **4. Key Characteristics & Metallurgical Behavior** * **Free-Machining Core Property:** The primary reason for selecting this grade. Manganese sulfide (MnS) inclusions improve chip formation, reduce cutting tool wear, and often allow for a better machined surface finish. * **Cost-Effective Feedstock:** The hot-rolled form is the most economical way to purchase this material for subsequent machining. * **Low Strength, High Ductility:** Provides moderate tensile strength and very good elongation, making it suitable for parts that may undergo some forming. * **Weldability:** **Poor.** The high sulfur content significantly increases the risk of **hot cracking (solidification cracking)** during welding. Welding is generally **not recommended** for critical applications. If unavoidable, requires specialized low-sulfur filler metal, low heat input, and careful procedure control. * **Non-Responsive to Hardening:** Cannot be strengthened by quenching and tempering. Any increase in strength comes from cold working during forming or machining. --- #### **5. Primary Product Applications** This product is used as a raw material for machining components where cost and machinability are prioritized over final strength and precision. * **General Purpose Machined Parts:** **Studs, bolts, nuts, set screws, spacers, bushings, and pins** manufactured in high volume on screw machines, automatics, and CNC lathes. * **Automotive Non-Structural Components:** Various **brackets, linkages, clamps, and fittings** not subject to high stress or impact. * **Hardware & Fastener Stock:** Base material for commercially available low-strength fasteners and hardware items. * **Fixture & Jig Components:** For tooling and workholding where easy machinability is valued over extreme durability. * **Shafts & Axles for Very Light Duty:** Applications with minimal torsional or bending loads. --- #### **6. Relevant International & Industry Standards** | Standard System | Standard Designation | Title / Scope | | :--- | :--- | :--- | | **AISI / SAE / UNS (USA)** | **1108, SAE J403, UNS G11080** | Standard Free-Machining Steel Grade | | **ASTM (USA)** | **ASTM A29/A29M** | Specification for Steel Bars, Carbon and Alloy, Hot-Wrought | | **ASTM (USA)** | **ASTM A576** | Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality | | **DIN / EN (Germany/EU)** | **1.0711 / 9SMn28** | EN 10087: Free-cutting steels. A direct equivalent. | | **JIS (Japan)** | **SUM22** | Free Cutting Steel Bars (JIS G4804). | | **GB (China)** | **Y15** | Free-Cutting Steel (GB/T 8731). | --- ### **Manufacturing & Selection Guide** 1. **Material Selection:** Choose hot-rolled AISI 1108 when designing **high-volume, non-critical parts** where **machining speed and tool life are paramount**, and the initial material cost is a significant factor. 2. **First Processing Step:** Remove mill scale via **pickling, shot blasting, or turning** before precision machining or finishing. 3. **Fabrication:** Excellently suited for **high-speed turning, drilling, tapping, and milling**. Also suitable for **cold forming (bending, heading)** prior to machining. 4. **Heat Treatment:** Generally not performed. Can be **carburized** to create a hard, wear-resistant surface on a tough, machinable core if needed. 5. **Finishing:** Can be plated or painted after scale removal and cleaning. **Weldability Warning:** **Avoid welding if possible.** Design assemblies using mechanical fasteners. For necessary welds, consult a welding specialist familiar with high-sulfur steels. **Summary:** **AISI 1108 hot-rolled round bar is an economical, free-machining steel designed for production efficiency.** It delivers **superior machinability at a low entry cost**, making it a staple material for manufacturers of non-critical, mass-produced components. Its value is realized on the shop floor through **reduced cycle times, lower tooling costs, and high material yield**. While it lacks the strength for structural applications and poses welding challenges, it remains a top choice for the cost-driven manufacturing of parts where easy machining is the definitive requirement. -:- For detailed product information, please contact sales. -: AISI 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4922 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 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1108 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1108 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 1393 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