AISI 1137 Steel, cold drawn

AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ## **Product Data Sheet: AISI 1137 Steel, Cold Drawn Round Bar (19-32 mm / 0.75-1.25 in)** --- ### **1. Product Overview** **AISI 1137** is a medium-carbon, **resulfurized free-machining steel** that achieves enhanced mechanical properties and superior dimensional control through the **cold drawing** process. This manufacturing method involves pulling hot-rolled stock through a precision die at room temperature, resulting in significant improvements in strength, surface finish, and dimensional accuracy compared to standard hot-rolled material. This datasheet details specifications for **cold drawn round bar** in the **19 mm to 32 mm (0.75 in to 1.25 in)** diameter range. This product represents the **premium form** of AISI 1137, combining the inherent free-machining characteristics of a sulfur-enhanced steel with the benefits of cold working. It is engineered for components requiring **excellent machinability, tight tolerances, and improved mechanical properties in the "as-finished" state**, with the option for subsequent heat treatment. **Key Advantages of Cold Drawn AISI 1137:** * **Enhanced Strength & Hardness:** Cold working significantly increases tensile and yield strength through strain hardening, providing superior mechanical properties without heat treatment. * **Exceptional Machinability:** The sulfur content (0.08-0.13%) ensures excellent chip formation and surface finish during machining, while the cold-drawn condition provides consistent cutting performance. * **Superior Dimensional Precision:** Cold drawing delivers tight diameter tolerances (±0.075 mm typical), excellent straightness, and uniform cross-sections, reducing setup time and improving part consistency in automated machining. * **Premium Surface Quality:** Features a bright, smooth, scale-free surface ready for immediate machining, plating, or assembly, eliminating the need for scale removal. * **Versatile Performance Base:** Suitable for use in the as-drawn state or as a pre-form for quenching and tempering, offering flexibility in manufacturing processes. --- ### **2. Chemical Composition (Standard % by Weight)** The composition provides an optimal balance of machinability, strength, and moderate hardenability. | Element | Content (%) | Function & Implication | | :--- | :--- | :--- | | **Carbon (C)** | 0.32 - 0.39 | **Primary strength element.** Provides the foundation for mechanical properties and enables effective response to heat treatment. | | **Manganese (Mn)** | 1.35 - 1.65 | **Critical for Hardenability.** Enhances through-hardening capability and combines with sulfur to form beneficial manganese sulfide (MnS) inclusions. | | **Phosphorus (P)** | ≤ 0.040 | Residual element, controlled to maintain toughness. | | **Sulfur (S)** | 0.08 - 0.13 | **Machinability Enhancer.** Forms MnS inclusions that act as internal chip breakers, significantly improving machinability over non-resulfurized grades. | | **Iron (Fe)** | Balance | Base metal. | --- ### **3. Typical Physical & Mechanical Properties (Cold Drawn Condition)** *Properties reflect the strain-hardened state from cold drawing. Values may vary slightly with specific reduction ratios.* | Property | Typical Value (Metric) | Typical Value (Imperial) | | :--- | :--- | :--- | | **Tensile Strength** | 620 - 760 MPa | 90,000 - 110,000 psi | | **Yield Strength (0.2% Offset)** | 515 - 655 MPa | 75,000 - 95,000 psi | | **Elongation (in 50 mm)** | 12% - 18% | 12% - 18% | | **Reduction of Area** | 35% - 50% | 35% - 50% | | **Hardness** | 197 - 255 HB | 197 - 255 HB | | **Surface Finish (Ra)** | 0.8 - 1.6 μm | 32 - 63 μin | | **Dimensional Tolerance** | **Precision (H9/g6 typical)** | Superior to hot-rolled standards | | **Machinability Rating** | **~ 80-85%** (AISI 1212 = 100%) | Excellent for a medium-carbon steel | --- ### **4. International Standards & Cross-References** This cold drawn product conforms to international standards for cold-finished steel bars. | Standard System | Equivalent Designation | Applicable Specification | Notes | | :--- | :--- | :--- | :--- | | **ASTM / AISI (USA)** | AISI 1137 | **ASTM A108** (Standard for Steel Bar, Carbon, Cold-Finished) | Grade 1137 | | **SAE (USA)** | SAE 1137 | SAE J403, J412 | | | **UNS (USA)** | G11370 | - | | | **DIN (Germany)** | **1.0735** (40S20) | DIN EN 10277 (Bright steel) | | | **BS (UK)** | **216M36** | BS 970 | | | **JIS (Japan)** | **SUM 43** | JIS G4804 | Close equivalent | | **AFNOR (France)** | 40MF4 | NF A35-552 | | --- ### **5. Primary Applications** Cold drawn AISI 1137 is selected for precision components requiring excellent machining performance, dimensional consistency, and good as-finished strength. * **Precision Machined Parts:** Shafts, pins, studs, and bushings produced on CNC lathes and automatic screw machines where tight tolerances and surface finish are critical. * **Fastener Manufacturing:** High-quality bolts, screws, and set screws requiring consistent dimensions and good thread rolling characteristics. * **Automotive Components:** Transmission shafts, gear blanks, clutch components, and fuel system parts that benefit from improved machinability. * **Hydraulic & Pneumatic Systems:** Cylinder rods, piston rods, and valve stems requiring precise dimensions and smooth surfaces. * **General Machinery:** Drive shafts, rollers, spindles, and tool holders where the combination of strength and machinability reduces manufacturing costs. * **Electrical Components:** Connector bodies and precision fittings that are plated after machining. --- ### **6. Processing & Fabrication Notes** * **Heat Treatment:** Well-suited for **quenching and tempering** to achieve higher strength levels. Typical process: Austenitize at 830-860°C (1525-1580°F), quench in oil, and temper. **Stress relieving** before hardening complex parts is recommended to minimize distortion from cold work stresses. * **Machining:** **Excellent machinability.** The sulfur inclusions provide effective chip breaking. Use sharp tools with positive rake angles. The cold-drawn condition ensures consistent cutting forces and predictable tool life. * **Weldability:** **Poor.** The combination of medium carbon and sulfur content increases the risk of heat-affected zone cracking. Welding is not recommended for critical applications. If unavoidable, use low-hydrogen procedures with extensive pre-heat and post-weld heat treatment. * **Cold Forming:** Limited capability due to work hardening. Simple bending is possible but may require annealing for complex forming operations. * **Surface Treatments:** The bright surface is ideal for plating (zinc, nickel, chrome) or painting with minimal preparation. For improved corrosion resistance, consider phosphate coating or black oxide. * **Grinding:** Responds well to grinding operations. Use proper wheel selection and coolant to avoid thermal damage. --- ### **7. Quality & Inspection** * **Dimensional Verification:** Supplied to precision tolerances per ASTM A108 or customer specifications * **Surface Inspection:** Bright finish free from scale, cracks, and significant seams * **Certification:** Mill test certificates available confirming chemical composition and mechanical properties * **Straightness:** Typically within 1.5 mm per meter of length --- **Disclaimer:** The information provided is for technical reference. Mechanical properties can vary with the specific cold reduction ratio and manufacturer's process control. For critical applications, prototype testing and consultation with the material supplier are recommended. Always review Safety Data Sheets (SDS) and material certifications before use. Note that anisotropic behavior is characteristic of resulfurized steels. -:- For detailed product information, please contact sales. -: AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4964 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 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1137 Steel, cold drawn, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1137 Steel, cold drawn, 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 1435 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