AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn

AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar Product Information -:- For detailed product information, please contact sales. -: AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar Synonyms -:- For detailed product information, please contact sales. -:

AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1085 Carbon Steel, Spheroidized Annealed & Cold Drawn Bar** #### **1. Overview** AISI 1085 in the **Spheroidized Annealed and Cold Drawn** condition is a premium, process-engineered form of ultra-high-carbon steel. This specialized treatment is critical for transforming this inherently hard and brittle steel into a material suitable for **severe cold forming and precision machining**. The spheroidized anneal converts the hard, plate-like carbides into soft, spherical particles, achieving the maximum possible ductility and uniformity. The subsequent cold drawing process enhances dimensional accuracy, improves surface finish, and provides a controlled increase in yield strength. This product is the essential starting material for manufacturers who require complex shaping at room temperature prior to achieving the steel's final, legendary hardness and wear resistance through heat treatment. --- #### **2. Chemical Composition (AISI/SAE Standard)** | Element | Content (%) | | :--- | :--- | | **Carbon (C)** | **0.80 - 0.93** | | **Manganese (Mn)** | 0.70 - 1.00 | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | ≤ 0.050 | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | **Note:** The carbon content is at the upper limit for standard carbon steels, and the manganese range is typically at the higher end of the 10xx series. This combination provides exceptional hardenability and the potential for the highest attainable hardness (~65-67 HRC) after quenching. --- #### **3. Typical Physical & Mechanical Properties (As-Delivered)** | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Spheroidized Annealed + Cold Drawn | | **Microstructure** | **Spheroidite** (Globular carbides in a soft, ductile ferrite matrix) | | **Tensile Strength** | **550 - 720 MPa (80 - 104 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 - 96 HRB** (Rockwell B) / **~ 150 - 215 HB** (Brinell) | | **Machinability** | **Good for its carbon level (~65% of AISI 1212).** The spheroidized structure offers excellent chip control, reduced tool wear, and a superior surface finish compared to a pearlitic structure. | | **Cold Formability** | **Excellent.** This is the primary purpose of this condition. It enables severe deformation processes like cold heading, extrusion, and bending without cracking. | | **Surface Finish & Tolerance** | Smooth, bright, scale-free surface with tight dimensional tolerances and excellent 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, edge retention, and elastic limit. | --- #### **4. Key Characteristics & Metallurgical Rationale** * **Essential Spheroidized Anneal:** For AISI 1085, this prolonged heat treatment is not optional—it is mandatory for any cold work. It eliminates the brittle, lamellar pearlitic structure and forms benign spherical carbides, drastically reducing hardness and increasing ductility to safe levels for forming. * **Cold Drawing Benefits:** Improves dimensional accuracy and consistency, provides a superior bright finish, imparts beneficial strain hardening (increasing yield strength), and ensures excellent straightness. * **Dual-Phase Manufacturing Strategy:** Supplied in a **soft, formable phase** for fabrication, it is later transformed by the end-user into a **hard, ultra-wear-resistant phase** for final performance. * **Consistent and Predictable:** This condition guarantees uniform behavior during cold forming and a highly consistent response to subsequent hardening, which is critical for high-volume production. --- #### **5. Primary Product Applications** This product form is the specified feedstock for manufacturing the most demanding high-strength and wear-resistant components via cold forming. * **Ultra-High-Strength Cold Headed Fasteners:** **Critical bolts, screws, and pins** for aerospace, automotive racing, and high-performance machinery where severe upsetting is required and final hardness is paramount. * **Cold Forged Cutting Tool Blanks:** Blanks for **premium knives, cutting blades, and industrial cutters** that are formed to near-net shape before final grinding and hardening. * **High-Stress Springs (Cold Coiled):** Wire for manufacturing the highest-performance **coil springs, valve springs, and torsion bars** via cold coiling processes. * **Precision Machined Components:** Parts such as **firearm components, precision shafts, and tooling inserts** that require extensive, precise machining prior to achieving final extreme hardness. * **Bearing and Wear Component Blanks:** For parts that are machined to tight tolerances in the soft state and then through-hardened for maximum service life. --- #### **6. Relevant International & Industry Standards** | Standard System | Standard Designation | Title / Scope | | :--- | :--- | :--- | | **AISI / SAE / UNS (USA)** | **1085, SAE J403, UNS G10850** | 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)** or **1.1274 (+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# / 90# (ML)** | Cold Heading and Cold Extruding Steel (GB/T 6478) or similar. | --- ### **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 (Highly Recommended):** After severe cold work, a low-temperature stress relief (~315-425°C / 600-800°F) is strongly recommended to prevent delayed cracking during the final hardening quench. 3. **Heat Treatment (Final Step – Requires High Precision):** * **Austenitize:** ~775-790°C (1425-1450°F). **Precise control is vital** to avoid grain growth. * **Quench:** Typically in **warm, agitated oil**. Provides the best balance of maximum hardness and minimized cracking risk for this grade. * **Temper:** **Immediately** after quenching. Temperature is application-dependent (e.g., 150-200°C for maximum hardness in blades, 300-450°C for springs and high-strength tools). 4. **Finishing:** Final grinding or surface treatment. **Weldability:** **Extremely poor.** Welding is strongly discouraged and should only be attempted prior to final heat treatment with extreme precautions (high preheat, post-heat, specialized fillers). **Summary:** AISI 1085 Spheroidized Annealed & Cold Drawn Bar is a **high-performance, manufacturing-enabling material**. It allows for the cost-effective, high-volume production of components that require the **ultimate in hardness, strength, and wear resistance** achievable with carbon steel. Its value lies in bridging the gap between **exceptional fabricability in the soft state** and **transformative potential into a supremely hard final product**. It is the material of choice for industries that cannot compromise on performance, such as premium cutlery, high-stress springs, and critical fasteners, where the limits of carbon steel are deliberately pushed. -:- For detailed product information, please contact sales. -: AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar Specification Dimensions Size： Diameter 20-1000 mm Length <4894 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 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar -:- For detailed product information, please contact sales. -:

Packing of AISI 1085 Carbon Steel, Spheroidized Annealed and Cold Drawn Bar -:- 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 1365 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