AISI 1070 Steel Rod/Bar

AISI 1070 Steel Rod, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: AISI 1070 Steel Rod, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1070 Steel, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Data Sheet: AISI 1070 Steel, Cold Drawn, Spheroidized Annealed, Round Bar (19-32 mm / 0.75-1.25 in)** **1. Overview** AISI 1070 Steel, supplied as a cold-drawn and spheroidized annealed round bar in the 19-32 mm diameter range, represents a premium-grade, high-carbon steel product optimized for **cold forming and machining**. The spheroidized annealed microstructure, characterized by globular (spheroidal) carbides in a soft ferrite matrix, provides an exceptional combination of low hardness, high ductility, and good machinability for its carbon level. The subsequent cold drawing process improves dimensional accuracy, surface finish, and yield strength. This product is the ideal starting material for manufacturers who need to perform severe cold working (e.g., upset forging, cold heading) or precision machining before final heat treatment to achieve high strength and wear resistance. --- **2. Chemical Composition (Standard AISI/SAE Specification)** This grade is defined by a narrow carbon range that balances formability and final hardness potential. | Element | Content (%) | | :--- | :--- | | **Carbon (C)** | 0.65 - 0.75 | | **Manganese (Mn)** | 0.60 - 0.90 | | **Phosphorus (P)** | ≤ 0.040 | | **Sulfur (S)** | ≤ 0.050 | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | --- **3. Typical Physical & Mechanical Properties (As-Delivered: Spheroidized Annealed & Cold Drawn)** | Property | Typical Value / Description | | :--- | :--- | | **Density** | 7.85 g/cm³ (0.284 lb/in³) | | **Modulus of Elasticity** | 190-210 GPa (27,500-30,500 ksi) | | **Tensile Strength** | 515 - 620 MPa (75 - 90 ksi) | | **Yield Strength (0.2% Offset)** | **415 - 550 MPa (60 - 80 ksi)** *(Increased by cold work)* | | **Elongation (in 50 mm / 2 in)** | **≥ 12%** | | **Reduction in Area** | **≥ 45%** | | **Hardness** | **75 - 85 HRB** (Rockwell B) / **137 - 179 HB** (Brinell) | | **Machinability** | **Good for its carbon content (~65% of AISI 1212).** The spheroidized structure allows for better chip breaking and lower tool wear compared to a pearlitic structure. | | **Cold Formability** | **Excellent.** The spheroidized annealed condition is the softest possible state for high-carbon steel, permitting extensive deformation without cracking. | | **Surface Finish** | Smooth, with a superior finish and tighter tolerances compared to hot-rolled products due to the cold drawing process. | --- **4. Key Characteristics & Metallurgical Rationale** * **Spheroidized Annealed Microstructure:** The cementite (iron carbide) is present as small, round particles (spheroids) rather than the hard, plate-like lamellae found in pearlite. This drastically reduces hardness and increases ductility and toughness in the pre-form state. * **Cold Drawing Benefits:** Imparts slight strain hardening, increasing yield strength and improving dimensional consistency (±0.075 mm to ±0.175 mm), straightness, and surface quality. * **Hardenability Response:** While delivered soft, AISI 1070 has **very high hardenability potential**. After forming/machining, components can be quenched and tempered to achieve very high hardness (up to 60-65 HRC) and exceptional wear resistance. * **Limited Weldability:** As with all high-carbon steels, welding is not recommended due to extreme crack sensitivity. If unavoidable, requires stringent pre-heat, post-heat, and specialized procedures. --- **5. Primary Product Applications** This specific form of AISI 1070 is the **preferred feedstock** for manufacturing high-strength, wear-resistant components via cold forming processes. * **Cold Forged / Upset Parts:** High-strength bolts, screws, nuts, axles, and pins where severe head forming or shaping is required. * **Cold Headed Fasteners:** Critical fasteners for automotive, construction, and machinery that gain strength through work hardening and subsequent heat treatment. * **Tooling Components:** Punches, dies, blades, and other tooling parts that are machined or formed in the soft state and then hardened. * **Springs:** Coil springs, torsion bars, and leaf springs (especially where cold coiling or forming is the manufacturing method). * **Shafts & Pins:** Precision shafts, dowel pins, and rollers that require good machined finish before hardening. * **Agricultural & Cutting Tools:** Components for tillage equipment and cutting blades that are stamped or formed cold. --- **6. Relevant International & Industry Standards** This product meets dimensional and material specifications under several key standards. | Standard System | Standard Designation | Title / Scope (Relevant to this Product Form) | | :--- | :--- | :--- | | **AISI / SAE (USA)** | **1070** | Standard Carbon Steel Grade | | **ASTM (USA)** | **ASTM A510** | Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel *(Covers spheroidized wire rod feedstock)* | | **ASTM (USA)** | **ASTM A29/A29M** | Specification for Steel Bars, Carbon and Alloy *(Covers cold-finished bars. Spheroidize annealing is a specified option.)* | | **ASTM (USA)** | **ASTM A1074** | Specification for Hot-Rolled and Spheroidized Annealed Steel Bars for Forging and Similar Applications | | **UNS (USA)** | **G10700** | Unified Numbering System | | **DIN (Germany)** | **1.1231 / C70W2** | Equivalent grade for hardening steel, often supplied soft-annealed. | | **JIS (Japan)** | **SWRH72A / SWRH72B** | Similar grade for wire rod. | | **GB (China)** | **70#** | (GB/T 699, Quality Carbon Structural Steel) | --- **Processing Note:** The successful use of this material involves a standard workflow: 1. **Fabrication:** Machine or cold form the part from the soft, spheroidized annealed bar. 2. **Heat Treatment:** Harden by austenitizing (typically ~790-815°C / 1450-1500°F), quenching in oil, and then tempering at the desired temperature to achieve the final balance of hardness and toughness. 3. **Finishing:** Optional grinding or polishing. **Summary:** AISI 1070 cold-drawn, spheroidized annealed round bar is a high-performance *process-ready* material. It is engineered to facilitate complex manufacturing operations in the soft state, enabling the production of components that will ultimately possess the superior strength and durability inherent to high-carbon steel after final heat treatment. -:- For detailed product information, please contact sales. -: AISI 1070 Steel, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round Specification Dimensions Size： Diameter 20-1000 mm Length <4863 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 1070 Steel, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1070 Steel Rod, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1070 Steel Rod, cold drawn, spheroidized, annealed, 19-32 mm (0.75-1.25 in) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1070 Steel Rod, cold drawn, spheroidized, annealed, 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 Rod 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 1334 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