AISI 1084 Steel Wire,UNS G10840

AISI 1084 Steel Wire, Hot Rolled Bar (UNS G10840) Product Information -:- For detailed product information, please contact sales. -: AISI 1084 Steel Wire, Hot Rolled Bar (UNS G10840) Synonyms -:- For detailed product information, please contact sales. -:

AISI 1084 Steel, Hot Rolled Bar (UNS G10840) Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1084 Steel, Hot-Rolled Bar (UNS G10840)** #### **1. Overview** AISI 1084 (UNS G10840) is a very high-carbon, non-alloy steel supplied in the standard hot-rolled bar form. With a carbon content at the upper end of the common high-carbon range, it is renowned for its exceptional potential for hardness, strength, and wear resistance after appropriate heat treatment. In its as-rolled condition, it provides a cost-effective raw material characterized by a mill-scaled surface and a pearlitic microstructure, offering good machinability for roughing operations and suitability for forging. AISI 1084 is a premier choice for applications demanding the ultimate in performance from a plain carbon steel, particularly in tools, blades, and heavy-duty springs. --- #### **2. Chemical Composition (AISI/SAE Standard)** | 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 | **Key Distinction:** The carbon range (0.80-0.93%) positions AISI 1084 among the highest carbon non-alloy steels, providing maximum hardenability and attainable hardness within the AISI 10xx series. It is often considered alongside AISI 1095. --- #### **3. Typical Physical & Mechanical Properties (As-Hot Rolled)** *Properties are for the "black," as-rolled state prior to any further processing.* | Property | Typical Value / Description | | :--- | :--- | | **Condition** | Hot-Rolled (Pearlitic Microstructure) | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Modulus of Elasticity** | 190-210 GPa (27.5-30.5 x 10⁶ psi) | | **Tensile Strength** | **690 - 850 MPa (100 - 123 ksi)** | | **Yield Strength (0.2% Offset)** | **380 - 480 MPa (55 - 70 ksi)** | | **Elongation (in 50 mm)** | **~ 10%** | | **Reduction in Area** | **~ 20 - 25%** | | **Hardness** | **201 - 255 HB** (Brinell) | | **Machinability** | **Fair to Poor (~45% of AISI 1212).** The high carbon content and pearlitic structure make it abrasive. Machinability improves significantly after normalizing or annealing. | | **Surface Finish** | Standard hot-rolled finish with adherent mill scale. | --- #### **4. Key Characteristics & Heat Treatment Response** * **Exceptional Hardenability:** The high carbon content provides superb response to quenching. It can achieve the highest hardness levels (up to 65-67 HRC) of any standard plain carbon steel, resulting in outstanding wear resistance and edge retention. * **High Strength & Elastic Limit:** After proper quenching and tempering (e.g., to a spring temper), it develops an extremely high yield strength, making it an excellent material for high-stress springs and structural components. * **Moderate As-Rolled Ductility:** Suitable for hot forging and bending, but not for significant cold forming without intermediate annealing. * **Very Poor Weldability:** **Not recommended for welding.** The very high carbon content creates extreme susceptibility to cracking in the heat-affected zone. If welding is unavoidable, it requires stringent preheating (400-450°C / 750-850°F), post-heat, and specialized procedures. * **Sensitivity to Overheating:** During austenitizing for hardening, care must be taken not to overheat, as the high carbon content increases the risk of grain growth and quench cracking. --- #### **5. Primary Product Applications** AISI 1084 hot-rolled bar is a specialized feedstock for manufacturing components requiring extreme hardness and durability. * **Cutting Tools & Blades:** A premier choice for **high-performance knives (hunting, tactical), machetes, industrial shear blades, and scrapers** where maximum edge retention is critical. * **Springs:** Used for the most demanding **heavy-duty coil springs, leaf springs (for mining/trucking), and torsion bars** where the highest possible elastic limit is required. * **Hand Tools & Tooling:** For **chisels, punches, impact sockets, and die components** that must withstand extreme abuse without deforming. * **Wear Parts:** Components subject to severe abrasion: **agricultural plow shares, cultivator teeth, grader blades, and liners**. * **Forging Stock:** Ideal for forging **hammers, axes, and other striking tools** that require a very hard, durable working surface. --- #### **6. Relevant International & Industry Standards** | Standard System | Standard Designation | Title / Scope | | :--- | :--- | :--- | | **AISI / SAE / UNS (USA)** | **1084, SAE J403, UNS G10840** | Standard Grade Designation | | **ASTM (USA)** | **ASTM A29/A29M** | Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought | | **ASTM (USA)** | **ASTM A576** | Specification for Steel Bars, Carbon, Hot-Wrought, Special Quality (Grade 1084) | | **ASTM (USA)** | **ASTM A689** | Specification for Carbon and Alloy Steel Bars for Springs | | **DIN / EN (Germany/EU)** | **1.1248 / C85W2** | EN 10083-2: Steels for quenching and tempering. A common direct equivalent. | | **JIS (Japan)** | **SWRH82B / SWRH87A** | High Carbon Steel Wire Rods (similar composition). | | **GB (China)** | **85# / T8(A)** | Quality Carbon Structural Steel (GB/T 699) or Tool Steel equivalent. | --- ### **Manufacturing Pathway & Selection Guide** 1. **Material Selection:** Choose AISI 1084 for applications demanding **the ultimate in hardness, wear resistance, or elastic limit from a non-alloy steel**. 2. **Forming:** Shape via **hot forging, machining, or hot bending**. 3. **Heat Treatment (Critical & Requires Skill):** * **Austenitize:** Heat uniformly to ~790-800°C (1450-1475°F). **Avoid overheating.** * **Quench:** Rapidly cool in **oil** (recommended for most parts to control cracking) or **water** (for simple shapes requiring absolute maximum hardness). * **Temper:** **Immediately** reheat to a selected temperature (typically 150-400°C / 300-750°F) to achieve the desired hardness-toughness balance. 4. **Finishing:** Grinding, polishing, or surface treatment. **Summary:** **AISI 1084 hot-rolled bar is the pinnacle of performance for standard high-carbon steels.** It is selected when the design criteria call for the **maximum attainable hardness and strength** from a simple, cost-effective chemistry. Its value is realized entirely through precise and skilled heat treatment, transforming the soft as-rolled bar into an exceptionally hard and durable component. It is the material of choice for knifemakers, toolmakers, and spring manufacturers who require no-compromise performance from a plain carbon steel. -:- For detailed product information, please contact sales. -: AISI 1084 Steel, Hot Rolled Bar (UNS G10840) Specification Dimensions Size： Diameter 20-1000 mm Length <4891 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, Hot Rolled Bar (UNS G10840) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1084 Steel Wire, Hot Rolled Bar (UNS G10840) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1084 Steel Wire, Hot Rolled Bar (UNS G10840) -:- For detailed product information, please contact sales. -:

Packing of AISI 1084 Steel Wire, Hot Rolled 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 Wire 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 1362 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