AISI 1211 Steel, hot rolled

AISI 1211 Steel, hot rolled, 19-38 mm round Product Information -:- For detailed product information, please contact sales. -: AISI 1211 Steel, hot rolled, 19-38 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1211 Steel, hot rolled, 19-38 mm round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1211 Steel, Hot Rolled Round Bar (19-38 mm)** **Overview** AISI 1211 is a highly-engineered, low-carbon, resulfurized and rephosphorized free-machining steel supplied as a **hot rolled round bar** in the diameter range of **19-38 mm**. This grade represents one of the benchmark materials for superior machinability in low-carbon applications. Its primary design purpose is to facilitate high-speed, high-volume production of components on automatic screw machines and CNC lathes with minimal tool wear and excellent chip-breaking characteristics. Supplied in the economical as-rolled condition, AISI 1211 offers an optimal combination of ease of machining, good surface finish, and adequate strength for numerous non-critical structural parts. **Key Features & Advantages** * **Excellent Machinability:** AISI 1211 is renowned for its superior machinability among low-carbon steels. The high sulfur and phosphorus content dramatically improves chip formation, allows for higher cutting speeds and feeds, and significantly extends tool life. * **Cost-Effective Production:** The exceptional machinability translates directly to reduced cycle times, lower power consumption during machining, and decreased tooling costs, making it ideal for high-volume manufacturing. * **Good Surface Finish:** Produces excellent surface quality on machined parts, often reducing or eliminating the need for secondary finishing operations. * **Adequate Strength for Many Applications:** Provides sufficient mechanical strength for a wide range of non-structural, low-stress components. * **Readily Available & Economical:** As a standard hot-rolled product, it is widely available and represents a cost-effective raw material choice. --- ### **1. Chemical Composition (Standard Conformance)** The chemistry is specifically tailored to maximize machinability at the expense of other properties like weldability and transverse ductility. | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | ≤ 0.13 (max) | Low carbon ensures good ductility and weldability (though other elements limit it) and minimizes hardening. | | **Manganese (Mn)** | 0.60 – 0.90 | Combines with sulfur to form manganese sulfide (MnS) inclusions, which are crucial for chip breaking. | | **Phosphorus (P)** | 0.07 – 0.12 | **Elevated.** Increases strength and hardness slightly, and most importantly, significantly improves machinability by promoting chip brittleness. | | **Sulfur (S)** | 0.10 – 0.15 | **Elevated.** The primary free-machining additive. Forms MnS inclusions that act as internal stress raisers and chip breakers. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G12110 * **AISI/SAE:** 1211 * **ASTM:** A29 (Specification for Steel Bars, Carbon and Alloy, Hot-Wrought) * **DIN (Germany):** 9SMn28 / 1.0715 * **EN (Europe):** 1.0715 * **JIS (Japan):** SUM22 (similar, but chemistry differs) --- ### **2. Typical Physical & Mechanical Properties (Hot Rolled, As-Rolled Condition)** *Note: Properties are for reference in the as-rolled condition. AISI 1211 is almost exclusively chosen for its machinability, not its mechanical strength.* | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.87 g/cm³ | | **Machinability Rating** | **~100%** (The **industry benchmark**. 100% is defined as the machinability of AISI 1212; 1211 is very similar). | | **Tensile Strength** | 380 – 480 MPa (55 – 70 ksi) | | **Yield Strength (0.2% Offset)** | 275 – 345 MPa (40 – 50 ksi) | | **Elongation (in 50mm)** | 15% – 25% *(Note: Ductility is highly anisotropic; longitudinal values are much higher than transverse)* | | **Brinell Hardness (HB)** | 130 – 170 | | **Surface Condition** | Standard hot-rolled finish with mill scale. | --- ### **3. Product Applications** AISI 1211 hot rolled rounds are the material of choice for high-volume production of precision parts where machinability is the paramount concern. * **Fasteners and Small Hardware:** Nuts, bolts, screws, washers, and other mass-produced fasteners. * **Screw Machine Products:** A vast array of small, complex parts produced on automatic screw machines, such as connectors, fittings, bushings, and shafts for appliances, automotive, and hydraulic systems. * **Electrical and Plumbing Fittings:** Conduit fittings, valve bodies, and couplings. * **General Non-Critical Structural Parts:** Brackets, levers, and pins where high strength is not required. * **Shafts and Pins:** Low-stress shafts, dowel pins, and hinge pins. --- ### **4. Critical Considerations & Limitations** * **Poor Weldability:** **NOT RECOMMENDED FOR ANY FUSION WELDING.** The high sulfur and phosphorus content make it extremely prone to **hot cracking** (solidification cracking) and severe embrittlement in the weld and heat-affected zone. * **Anisotropic Properties:** Mechanical properties, especially ductility and impact toughness, are highly directional. Transverse properties are significantly inferior to longitudinal properties due to the stringer-like MnS inclusions. * **Not for Forging or Severe Cold Forming:** The high inclusion content and low ductility make it unsuitable for forging or applications requiring significant cold deformation. * **Low Strength:** Should not be used for critical, high-stress, or load-bearing structural applications. * **Comparison to 1212:** AISI 1211 has slightly higher phosphorus, which can offer a marginal machinability benefit in some operations but makes it slightly more brittle. 1212 is more common and often considered the universal free-machining standard. **Disclaimer:** This material is engineered for manufacturability, not for mechanical performance in demanding service. Proper application requires understanding its significant limitations in weldability, ductility, and strength. -:- For detailed product information, please contact sales. -: AISI 1211 Steel, hot rolled, 19-38 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <5002 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 1211 Steel, hot rolled, 19-38 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1211 Steel, hot rolled, 19-38 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1211 Steel, hot rolled, 19-38 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI 1211 Steel, hot rolled, 19-38 mm 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 1473 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