AISI 8630 Steel, annealed, 25 mm (1 in.) round

AISI 8630 Steel, annealed, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 8630 Steel, annealed, 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 8630 Steel, annealed, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 8630 Steel, Annealed Condition, 25 mm (1 inch) Round Bar** AISI 8630 is a versatile nickel-chromium-molybdenum low-alloy steel valued for its excellent hardenability, strength, and toughness. When supplied in the **annealed condition** as a **25 mm (1 inch) diameter round bar**, it is in its softest and most machinable state. This specific form and condition are ideal for manufacturing facilities that require stock material for machining into precise components, which will later undergo final heat treatment (such as carburizing, hardening, and tempering) to achieve their required service properties. The annealed microstructure ensures uniform machinability, minimal tool wear, and predictable dimensional stability during fabrication. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is engineered to provide a strong, tough core after final heat treatment, especially in larger sections. * **Carbon (C):** 0.28 - 0.33 * **Manganese (Mn):** 0.70 - 0.90 * **Phosphorus (P):** ≤ 0.035 * **Sulfur (S):** ≤ 0.040 * **Silicon (Si):** 0.20 - 0.35 * **Nickel (Ni):** 0.40 - 0.70 * **Chromium (Cr):** 0.40 - 0.60 * **Molybdenum (Mo):** 0.15 - 0.25 --- ### **2. Physical & Mechanical Properties (Annealed Condition, 25 mm round)** Annealing involves heating and slow cooling to produce a soft, coarse pearlitic and ferritic microstructure, optimized for machining. * **Hardness:** **149 - 179 HBW** (Brinell). This relatively low hardness is key to its excellent machinability. * **Tensile Strength:** **~520 - 655 MPa** (75 - 95 ksi) * **Yield Strength (0.2% Offset):** **~345 - 485 MPa** (50 - 70 ksi) * **Elongation:** **≥ 25%** (Typically higher in the annealed state) * **Machinability:** **Good**. Rated at approximately **60-65%** of the machinability of a 1% carbon steel (1006) standard. The uniform, soft structure allows for good chip breaking and longer tool life. * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **190 - 210 GPa** (27,500 - 30,500 ksi) * **Thermal Conductivity:** ~ **42.7 W/m·K** (at 100°C) * **Thermal Expansion Coefficient:** ~ **11.5 µm/m·°C** (20-100°C) --- ### **3. Key Features of the Annealed Condition (25 mm Round)** * **Optimal Machinability:** The primary reason for specifying annealed stock. It enables high-speed machining, drilling, and tapping with lower power consumption and reduced tool wear compared to normalized or pre-hardened states. * **Uniform Microstructure & Properties:** The 25 mm (1 in.) round cross-section ensures consistent cooling during annealing, resulting in homogeneous properties from surface to center, which is critical for predictable machining and subsequent heat treatment. * **Minimal Residual Stress:** The slow furnace cool minimizes internal stresses, reducing the risk of distortion during or after machining. * **Formability:** Can be cold-formed (bent, headed) more easily than in harder conditions, though it is less formable than low-carbon steels. * **Ideal Blank for Heat Treatment:** Provides a clean, uniform, and stress-free starting condition for processes like carburizing, carbonitriding, or through-hardening, leading to more consistent final results. --- ### **4. Primary Applications** This specific product form is used as raw material for machining **high-performance components** that will be heat-treated later. * **Gears and Pinions:** Blank stock for transmission gears, differential gears, and industrial pinions that will be **case carburized** to achieve a hard, wear-resistant surface and a tough, ductile core. * **Shafts and Axles:** Precursor material for automotive axle shafts, power take-off (PTO) shafts, and general machinery shafts that will be through-hardened and tempered. * **Hydraulic Components:** Cylinder rods, piston bodies, and valve parts requiring precise machining before surface hardening or plating. * **Fasteners and Studs:** High-strength bolts, studs, and pins that will be heat-treated after forming and threading. * **General Engineering Components:** Bushings, couplings, sprockets, and other custom parts where complex machining is required prior to final hardening. --- ### **5. Relevant International Standards & Specifications** * **USA – Primary Standards:** * **ASTM A29/A29M:** *Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished*. The annealed condition is a standard option. * **SAE J404:** *Chemical Compositions of SAE Alloy Steels*. * **SAE J414:** *Standard Specification for Alloy Steel Bars for Carburizing* (AISI 8630 is a common carburizing grade). * **AMS 2300/2301:** *Steel Cleanliness* specifications are often invoked for aerospace-quality 8630 bar stock. * **UNS Designation:** **G86300** * **International Equivalents:** * **Europe (DIN / EN):** **1.6523** (34CrNiMo6) is a closely related, often higher-alloyed grade. A direct common equivalent is **1.6546** (30NiCrMo2-2). * **International (ISO):** **ISO 683-18** covers alloy steels for heat treatment, including grades similar to 8630. * **Japan (JIS):** **SNC630** is a similar nickel-chromium steel, though molybdenum content may differ slightly. --- ### **6. Typical Annealing Process & Subsequent Processing** * **Full Annealing:** Heated to approximately **830-860°C (1525-1580°F)**, held for sufficient time (e.g., 1 hour per inch of thickness), then **slowly furnace-cooled** at a controlled rate (typically ≤ 20°C/hour) to below 500°C (930°F), then air-cooled. * **Spheroidize Annealing (Optional):** For even better machinability and formability, may be heated to just below the lower critical temperature (~680-700°C) for an extended period to produce globular carbides. * **Next Steps:** After machining, components are typically **carburized** (for case hardening) or **austenitized, quenched, and tempered** (for through-hardening) to achieve final service properties. --- ### **Conclusion** **AISI 8630 steel in the annealed condition, supplied as a 25 mm (1 inch) round bar**, represents the **ideal raw material state for manufacturability**. It prioritizes **excellent machinability and dimensional stability** to facilitate the cost-effective production of complex part geometries. This product serves as the critical first step in the manufacturing chain for high-value components, providing a uniform and predictable foundation that ensures successful subsequent heat treatment and reliable performance in demanding applications within the automotive, aerospace, and heavy machinery sectors. Its popularity stems from this reliable workflow: machine it easily in its soft state, then transform it via heat treatment into a strong, tough, wear-resistant finished component. -:- For detailed product information, please contact sales. -: AISI 8630 Steel, annealed, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <6317 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 8630 Steel, annealed, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8630 Steel, annealed, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8630 Steel, annealed, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 8630 Steel, annealed, 25 mm (1 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 2788 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