AISI 1215 Steel, drawn, ground, and polished

AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round Product Information -:- For detailed product information, please contact sales. -: AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1215 Steel, Drawn, Ground, and Polished (DGP) Round Bar (19-38 mm)** **Overview** AISI 1215 is a low-carbon, resulfurized and rephosphorized free-machining steel, and this product is supplied in its most premium precision form: **Drawn, Ground, and Polished (DGP) round bar** in the diameter range of **19-38 mm**. This multi-step finishing process—cold drawing followed by centerless grinding and final polishing—produces a material with exceptional dimensional accuracy, a mirror-like surface finish, and superb straightness. It combines the excellent machinability inherent to AISI 1215 with the geometric perfection required for high-precision applications such as linear motion shafts, hydraulic pistons, and bearing surfaces, often serving as a "ready-to-use" component with minimal further processing. **Key Features & Advantages** * **Exceptional Dimensional Accuracy and Surface Finish:** Offers the tightest possible tolerances (typically within ±0.013 mm or h6/h7 IT grades) and a very low surface roughness (Ra ≤ 0.4 μm / 16 μin), eliminating the need for finish grinding or honing. * **Superior Straightness and Geometric Perfection:** Precision grinding ensures near-perfect roundness and straightness, critical for high-speed rotating or linear motion applications to prevent vibration and premature wear. * **Excellent Machinability:** Retains the very good free-machining characteristics of AISI 1215 (Machinability ~90% of 1212), allowing for efficient final machining of ends, threads, or grooves when needed. * **Enhanced Surface Integrity:** The grinding and polishing process removes surface defects and decarburization from earlier processing, providing a clean, uniform, and hardened surface layer with improved fatigue resistance. * **Cost-Effective for Precision Applications:** Eliminates multiple secondary machining and finishing steps, reducing total manufacturing lead time and cost for components requiring high-quality bearing surfaces. --- ### **1. Chemical Composition (Standard Conformance)** The chemistry is similar to 1212 but with lower sulfur, offering a balance of machinability and slightly improved mechanical properties. | Element | Standard Range (%) | Key Function | | :--- | :--- | :--- | | **Carbon (C)** | ≤ 0.09 (max) | Very low carbon to maximize machinability and prevent hardening during final grinding/polishing. | | **Manganese (Mn)** | 0.75 – 1.05 | Combines with sulfur to form manganese sulfide (MnS) inclusions for chip breaking. | | **Phosphorus (P)** | 0.04 – 0.09 | **Elevated.** Improves machinability and chip formation. | | **Sulfur (S)** | **0.26 – 0.35** | **Very High.** The primary free-machining element. This higher sulfur (vs. 1212) provides excellent chip-breaking capability. **Note:** Some standards may list 1215 with lower sulfur; this specification reflects the high-sulfur variant for optimal machining. | | **Iron (Fe)** | Balance | Base element. | **Key International Standard Equivalents:** * **UNS:** G12150 * **AISI/SAE:** 1215 * **ASTM:** A108 (Standard for Cold-Finished Bars, with supplementary requirements for grinding/polishing) * **ASTM:** A29 * **DIN (Germany):** 9SMn36 / 1.0718 (similar high-sulfur free-cutting grade) * **EN (Europe):** 1.0718 * **JIS (Japan):** SUM22L or SUM23 --- ### **2. Typical Physical & Mechanical Properties (Drawn, Ground & Polished Condition, 19-38 mm)** | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.87 g/cm³ | | **Machinability Rating** | **~90-95%** (Relative to AISI 1212=100%). Very good free-machining characteristics. | | **Tensile Strength** | 450 – 550 MPa (65 – 80 ksi) | | **Yield Strength (0.2% Offset)** | **370 – 450 MPa (54 – 65 ksi)** | | **Elongation (in 50mm)** | 15% – 25% | | **Surface Hardness** | 150 – 200 HB (Surface may be slightly harder due to cold work) | | **Surface Roughness (Ra)** | **≤ 0.4 μm (16 μin)**. Mirror-like finish is standard; values as low as 0.2 μm (8 μin) are achievable. | | **Diameter Tolerance** | **±0.013 mm** or h6/h7 IT grade is typical. Exceptional precision. | | **Straightness** | Typically ≤ 0.5 mm per meter (0.005 in/ft). | --- ### **3. Product Applications** AISI 1215 DGP rounds are the material of choice for applications requiring a combination of precision-ground geometry, fine surface finish, and good machinability. * **Linear Motion Shafts and Guide Rods:** For ball bushings, linear bearings, and precision slides in automation, machine tools, and 3D printers. * **Hydraulic and Pneumatic Piston Rods:** Where a fine surface finish is required for effective sealing and low friction. * **Rollers and Pins:** Precision rollers for conveyors, cam followers, and dowel pins where exact diameter and smoothness are critical. * **Shafts for Bearings and Bushings:** Directly installable shafts for light to moderate duty bearing applications. * **General Precision Machined Components:** Parts that require a premium, ready-made precision surface, with only end-working or threading needed. --- ### **4. Critical Considerations & Limitations** * **Non-Weldable:** **NOT SUITABLE FOR WELDING.** The high sulfur and phosphorus content make it extremely prone to hot cracking. Assembly must be mechanical. * **Anisotropic Properties:** Exhibits directional properties typical of free-machining steels, with lower transverse ductility. Best suited for applications where primary loads are axial. * **Limited High-Stress Applications:** The low carbon content limits ultimate tensile strength. Not suitable for highly stressed structural components or severe impact loading. * **Residual Stress:** The cold drawing and grinding processes introduce residual surface stresses. For critical applications, stress relieving may be specified, though the polishing process often provides a degree of stress relief. * **Surface Integrity:** While the polished surface is excellent for bearing applications, the underlying free-machining microstructure (with MnS inclusions) is not as clean as that of bearing steels (e.g., 52100), which may limit its use in very high-pressure or fatigue-critical bearing applications. * **Comparison to 1212 DGP:** 1215 (high-sulfur variant) offers slightly better machinability, while 1212 offers slightly better consistency and is more common. For DGP products, the processing often outweighs the minor chemical differences. -:- For detailed product information, please contact sales. -: AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <5008 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 1215 Steel, drawn, ground, and polished, 19-38 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1215 Steel, drawn, ground, and polished, 19-38 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI 1215 Steel, drawn, ground, and polished, 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 1479 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