AISI 1084 Steel, Spheroidized Annealed and Cold Drawn,UNS G10840

AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) Product Information -:- For detailed product information, please contact sales. -: AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1084 Steel, Spheroidized Annealed & Cold Drawn Bar (UNS G10840)** #### **1. Overview** AISI 1084 (UNS G10840) in the **Spheroidized Annealed and Cold Drawn** condition represents a premium, process-optimized form of ultra-high-carbon steel. This specialized thermomechanical treatment is engineered to make this very hardenable yet brittle steel amenable to **severe cold forming and precision machining**. The spheroidized anneal produces the softest, most ductile state possible, transforming the hard carbides into benign spherical particles. The subsequent cold drawing enhances dimensional accuracy, surface finish, and imparts a beneficial increase in yield strength. This product is the essential starting material for manufacturers who must perform complex shaping at room temperature before imparting the final, extreme hardness and wear resistance through heat treatment. --- #### **2. Chemical Composition (AISI/SAE Standard)** The very high carbon content defines its ultimate performance envelope. | Element | Content (%) | | :--- | :--- | | **Carbon (C)** | **0.80 - 0.93** | | **Manganese (Mn)** | 0.60 - 0.90 | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | ≤ 0.050 | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | **Note:** This chemistry is capable of achieving the highest hardness levels among standard carbon steels after heat treatment. --- #### **3. Typical Physical & Mechanical Properties (As-Delivered)** *Properties reflect the unique soft, uniform microstructure optimized for fabrication.* | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Spheroidized Annealed + Cold Drawn | | **Microstructure** | **Spheroidite** (Globular carbides in a soft, ductile ferrite matrix) | | **Tensile Strength** | **550 - 700 MPa (80 - 102 ksi)** | | **Yield Strength (0.2% Offset)** | **450 - 620 MPa (65 - 90 ksi)** *(Enhanced by cold work)* | | **Elongation (in 50 mm)** | **≥ 12%** | | **Reduction in Area** | **≥ 45%** | | **Hardness** | **80 - 95 HRB** (Rockwell B) / **~ 150 - 210 HB** (Brinell) | | **Machinability** | **Good for its carbon level (~65% of AISI 1212).** The spheroidized structure provides excellent chip control, reduced tool wear, and a good surface finish. | | **Cold Formability** | **Excellent.** This is the primary purpose. It enables severe deformation processes like cold heading, extrusion, and bending without the cracking that would occur in any other microstructural state for this grade. | | **Surface Finish & Tolerance** | Smooth, bright, scale-free surface. Features tight dimensional tolerances and superior straightness from the cold drawing process. | | **Hardenability Potential** | **Exceptional.** After final part forming, it can be quenched and tempered to achieve **64-67 HRC**, providing supreme wear resistance and edge retention. | --- #### **4. Key Characteristics & Metallurgical Rationale** * **Spheroidized Anneal (Critical):** A prolonged heat treatment that converts the hard, lamellar cementite into soft, spherical carbides. For AISI 1084, this is **essential** to mitigate the extreme brittleness inherent in its high carbon content, making it safe for cold work. * **Cold Drawing Benefits:** Improves dimensional accuracy, provides a superior surface finish free of mill scale, imparts slight but useful strain hardening, and ensures excellent straightness. * **Dual-Phase Manufacturing Strategy:** The material is supplied in a **soft, formable phase** for fabrication and later transformed by the end-user into a **hard, wear-resistant phase** for final performance. * **Consistent Response:** This condition ensures uniform, predictable behavior during cold forming and a highly consistent response to subsequent hardening heat treatment. --- #### **5. Primary Product Applications** This product form is the specified feedstock for high-volume manufacturing of critical, high-performance components. * **High-Performance Cold Headed Fasteners:** **Extreme-strength bolts, screws, and pins** for automotive, aerospace, and defense applications where severe head forming is required and final hardness is critical. * **Cold Forged Cutting Tool Blanks:** Blanks for **knives, blades, and cutters** that are formed to near-net shape before final grinding and heat treatment. * **Springs (Cold Coiled):** Wire for the manufacture of the highest-stress **coil springs and torsion bars** via cold coiling processes. * **Precision Machined Components:** Parts such as **firearm actions, tool holders, and precision shafts** that require extensive machining prior to achieving their final extreme hardness. * **Bearing and Wear Component Blanks:** For parts that are machined to tight tolerances in the soft state and then through-hardened. --- #### **6. Relevant International & Industry Standards** | Standard System | Standard Designation | Title / Scope (Relevant to this Product Form) | | :--- | :--- | :--- | | **AISI / SAE / UNS (USA)** | **1084, SAE J403, UNS G10840** | Standard Grade Designation | | **ASTM (USA)** | **ASTM A1074** | **Key Standard:** Specification for Hot-Rolled and Spheroidized Annealed Steel Bars for Forging and Similar Applications. | | **ASTM (USA)** | **ASTM A29/A29M** | Specification for Steel Bars, Carbon and Alloy. Spheroidize annealing is an optional requirement. | | **ASTM (USA)** | **ASTM A510** | Specification for General Requirements for Wire Rods and Coarse Round Wire. | | **DIN / EN (Germany/EU)** | **1.1248 / C85W2 (+C)** | EN 10263-4: Steel rod, bars and wire for cold heading and cold extrusion. The "+C" denotes a spheroidized annealed condition. | | **JIS (Japan)** | **SWRCH82B / SWRCH87A** | Carbon steel wires for cold heading and cold forging (JIS G3507-1). Often supplied annealed. | | **GB (China)** | **85# / ML85** | Cold Heading and Cold Extruding Steel (GB/T 6478) or equivalent. | --- ### **Processing Pathway & Critical Notes** 1. **Fabrication:** The component is **cold headed, cold forged, extruded, or precision machined** from the soft, spheroidized bar. 2. **Stress Relieving (Recommended):** After severe cold work, a low-temperature stress relief (~300-400°C / 575-750°F) is recommended to prevent delayed cracking before the final hardening quench. 3. **Heat Treatment (Final Step – Requires Precision):** * **Austenitize:** ~775-790°C (1425-1450°F). **Caution:** Narrower range than lower-carbon steels to avoid grain growth and retained austenite. * **Quench:** Typically in **warm oil** for optimal balance of hardness and minimized cracking risk. Water quenching is possible for simple shapes but carries high risk. * **Temper:** Immediately to desired hardness (often 150-400°C / 300-750°F for tools and blades). 4. **Finishing:** Final grinding or surface treatment. **Weldability:** **Extremely poor.** Welding is strongly discouraged. If absolutely necessary, it must be done prior to final heat treatment with extreme precautions. **Summary:** AISI 1084 Spheroidized Annealed & Cold Drawn Bar is a **high-performance, manufacturing-critical material**. It enables the production of components with the **highest attainable carbon steel properties** through room-temperature forming processes. Its value lies in its ability to be **easily and complexly shaped in the soft state** before being transformed into an **extremely hard, wear-resistant, and high-strength final product**. It is indispensable for industries demanding the ultimate in performance from a cost-effective steel, such as premium tooling, cutlery, and high-stress fasteners. -:- For detailed product information, please contact sales. -: AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) Specification Dimensions Size： Diameter 20-1000 mm Length <4892 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 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) -:- For detailed product information, please contact sales. -:

Packing of AISI 1084 Steel, Spheroidized Annealed and Cold Drawn Bar (UNS G10840) -:- 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 1363 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