AISI 1137 Steel, hot rolled,

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

AISI 1137 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 1137 Steel, Hot Rolled, 19-32 mm (0.75-1.25 in) Round Bar** **Overview** AISI 1137 steel supplied as hot rolled round bar in the 19-32 mm (0.75-1.25 in) diameter range is the primary and most economical form of this widely used resulfurized free-machining steel. Characterized by its as-rolled condition with a dark mill scale surface, this product leverages a specific chemical composition—elevated sulfur and manganese—to deliver exceptional machinability directly in the as-supplied state. It serves as the foundational raw material for high-volume production of components where fast machining speeds, excellent chip formation, and low tooling costs are paramount, particularly in automatic screw machine and general machining operations. --- #### **1. Chemical Composition (Nominal, Weight %)** The composition is precisely formulated to prioritize machinability while providing usable strength. | Element | Carbon (C) | Manganese (Mn) | **Phosphorus (P)** | **Sulfur (S)** | Silicon (Si) | Iron (Fe) | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | **Content (%)** | 0.32 - 0.39 | 1.35 - 1.65 | **0.040 - 0.090** | **0.080 - 0.130** | 0.15 - 0.35 | Balance | * **Primary Role of Elements:** * **Carbon (0.32-0.39%):** Provides a solid foundation for strength and enables effective case hardening (e.g., carburizing) for wear resistance. * **Manganese (1.35-1.65%):** **Critical element.** The high manganese content combines with sulfur to form soft, elongated **manganese sulfide (MnS) inclusions**, which act as built-in chip breakers and lubricants during machining. * **Sulfur (0.08-0.13%):** **The key free-machining additive.** Its presence is essential for forming the MnS inclusions that define the grade's superior cutting performance. * **Phosphorus (0.04-0.09%):** Intentionally added to strengthen the ferrite matrix and increase chip brittleness, further enhancing machinability. --- #### **2. Physical & Mechanical Properties (Typical, As-Hot Rolled Condition)** *Properties reflect the material in its most economical, directly usable state for machining.* * **Hardness:** **~165-205 HB** (Approximately 83-93 HRB) * **Tensile Strength (Ultimate):** 560 - 710 MPa (81 - 103 ksi) * **Yield Strength (0.2% Offset):** 330 - 480 MPa (48 - 70 ksi) * **Elongation (in 50mm / 2in):** 15% - 22% * **Machinability:** **~80-90%** (Compared to 100% for AISI 1212). **Excellent.** The MnS inclusions promote short, broken chips, allow for higher cutting speeds and feeds, reduce cutting forces and power consumption, improve surface finish, and significantly extend tool life. * **Surface Condition:** Characteristic dark, adherent mill scale. Surface decarburization may be present. * **Key Limitation - Anisotropy:** Mechanical properties are highly **directional**. Ductility, impact toughness, and fatigue strength are significantly lower in the transverse (across the bar) direction than in the longitudinal direction due to the alignment of MnS inclusions. --- #### **3. Manufacturing Process & Metallurgical State** * **Process:** Steel is continuously cast, reheated, and hot rolled to the final round dimensions. The 19-32 mm size is a standard production size with good availability. * **Microstructure:** Consists of a ferrite-pearlite matrix with a network of elongated **manganese sulfide (MnS) inclusions** aligned in the rolling direction. * **Condition:** Standard supply is **As-Hot Rolled (HR)**. It may also be supplied as **annealed** for maximum softness or **cold drawn** for improved dimensional accuracy. --- #### **4. Product Applications** Hot rolled AISI 1137 is the workhorse material for high-volume machining of non-critical to moderately stressed components. * **Automatic Screw Machine Parts:** The quintessential application. Used to produce a vast array of components like shafts, pins, bushings, fittings, and fasteners on Swiss-type and multi-spindle automatics. * **General Machined Components:** Parts produced on CNC lathes and milling machines where material cost and machining speed are critical. * **Fasteners:** Nuts, bolts, studs, and specially threaded parts. * **Automotive Components:** Non-critical engine and chassis parts, brackets, linkages, and fittings that may be subsequently case hardened. * **Consumer Goods & Hardware:** Components for appliances, power tools, and plumbing fixtures. * **Gear and Sprocket Blanks:** For parts that will be machined and then case hardened (carburized) to provide a wear-resistant surface. --- #### **5. Relevant International Standards** This free-machining grade is recognized under various international standards, though exact compositional equivalents vary. * **ASTM (USA):** * **ASTM A29/A29M:** Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished. The primary governing standard. * **SAE (USA - Automotive):** **SAE J403, J412** (Grade 1137). * **UNS (Unified Numbering System):** **G11370** * **ISO (International):** * **ISO 683-18:** Heat-treatable steels, alloy steels and free-cutting steels – Part 18: Bright products (similar free-cutting types). * **DIN (Germany):** **DIN EN 10087:** Free-cutting steels (Comparable to **35S20**, **1.0726**). * **JIS (Japan):** JIS G4804: Free-cutting steels (Similar to **SUM 41**). * **BS (UK):** BS 970-1: (Historical grade **212M36**). --- #### **6. Key Advantages & Considerations** * **Advantages:** * **Exceptional Machinability:** Drastically reduces machining time and cost, improves surface finish, and extends tool life. * **Lowest Cost Form:** The most economical supply form for this grade. * **Good Strength for Machining:** Offers better mechanical properties than low-carbon free-machining steels like 12L14. * **Suitable for Case Hardening:** Can be carburized or carbonitrided to create a hard, wear-resistant surface. * **Considerations (CRITICAL):** * **Poor Transverse Properties:** **Not suitable for applications involving significant stress across the bar.** Components must be designed to load primarily parallel to the bar axis (longitudinal direction). * **Not Weldable:** The high sulfur and phosphorus content make it **extremely susceptible to hot cracking**. Welding is **not recommended**. * **Not for Through-Hardening:** **Unsuitable for quenching and tempering** due to very high risk of quench cracking and poor transverse toughness. * **Surface Scale:** Mill scale must be removed (via pickling, shot blasting, or machining) for many finishing operations or prior to plating/painting. * **Dimensional Tolerances:** Wider tolerances and less perfect straightness than cold-drawn product. --- **Summary:** AISI 1137 hot rolled round bar in the 19-32 mm range is a **highly specialized production material** optimized for **manufacturing economy in high-volume machining**. It is the strategic choice when minimizing machining cost per part is the dominant requirement, and the design can accommodate its directional properties and lack of weldability. It represents a classic and successful trade-off: sacrificing isotropic mechanical performance and weldability for unparalleled machining efficiency in the production of a vast range of commercial and automotive components. -:- For detailed product information, please contact sales. -: AISI 1137 Steel, hot rolled, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <6123 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, hot rolled, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 1137 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 2594 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