AISI 8630H Steel, annealed

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

AISI 8630H Steel, annealed, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8630H Steel, Annealed Condition, 25 mm (1 in.) Round Bar** AISI 8630H is a hardenability-controlled, nickel-chromium-molybdenum low-alloy steel, where the "H" designation guarantees consistent end-quench hardenability performance across production batches. Supplied as **25 mm (1 inch) diameter round bar in the annealed condition**, this product represents the optimal starting material for manufacturers of precision components. This specific form and condition provide exceptional machinability, uniform microstructure, and dimensional stability, making it the preferred choice for parts that will undergo complex machining operations before final heat treatment (typically carburizing or through-hardening). The guaranteed hardenability ensures predictable and consistent final properties after heat treatment. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is controlled to meet specific hardenability band requirements rather than fixed chemical limits. * **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 *H-Grade Significance:* The "H" classification allows controlled chemical variations to ensure every production lot falls within the standardized hardenability band (SAE J1268), guaranteeing consistent heat treatment response regardless of minor compositional differences. --- ### **2. Physical & Mechanical Properties (Annealed Condition, 25 mm Round)** Annealing produces a soft, coarse ferrite-pearlite microstructure optimized for machining. * **Hardness:** **149 - 179 HBW** (Brinell) * **Tensile Strength:** **520 - 655 MPa** (75 - 95 ksi) * **Yield Strength (0.2% Offset):** **345 - 485 MPa** (50 - 70 ksi) * **Elongation:** **25 - 30%** * **Reduction of Area:** **55 - 65%** * **Machinability:** **Excellent** (approximately 70% of a 1% carbon steel standard). The uniform annealed structure ensures consistent chip formation, extended tool life, and excellent surface finish. * **Hardenability Band:** Guaranteed per SAE J1268 - Provides predictable hardening depth in final heat treatment. * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **205 GPa** (29,700 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 & Manufacturing Advantages** * **Optimized Machinability:** The primary benefit of the annealed condition. The soft, uniform structure allows high-speed machining with minimal tool wear, reducing production costs for complex components. * **Guaranteed Hardenability Consistency:** Unlike standard 8630, the "H" grade ensures predictable and repeatable case depth and core hardness after final heat treatment, critical for quality control in high-volume production. * **Uniform Microstructure in Round Form:** The 25 mm (1 in.) diameter ensures consistent cooling during annealing, resulting in homogeneous properties from surface to center - essential for predictable machining and heat treatment. * **Minimal Residual Stress:** The slow furnace cooling eliminates internal stresses from prior processing, reducing the risk of distortion during and after machining. * **Excellent Formability:** Suitable for cold forming operations like bending and swaging before final hardening. * **Superior Surface Finish:** Capable of achieving fine surface finishes (≤ 1.6 µm Ra) in machining operations. --- ### **4. Primary Applications** This specific product form is the raw material of choice for high-precision components requiring subsequent heat treatment. * **Automotive Gearing:** **Transmission gears**, differential pinions, and synchronizer hubs that will be case carburized. * **Aerospace Components:** **Landing gear parts**, actuator components, and engine mounts requiring precision machining before hardening. * **Hydraulic Systems:** **Piston rods**, cylinder barrels, and valve bodies for high-pressure applications. * **Tooling & Fixtures:** **Jig and fixture components**, die sets, and machine tool elements. * **Agricultural Equipment:** **Gear blanks**, shafting, and implement components. * **General Precision Parts:** **Bushings**, couplings, bearing races, and custom machined components. --- ### **5. Relevant International Standards & Specifications** * **USA – Primary Standards:** * **ASTM A304:** *Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements* * **SAE J1268:** *Hardenability Bands for H-Steels* * **ASTM A29/A29M:** *Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished* * **AMS 2300/2301:** *Steel Cleanliness* specifications for aerospace applications * **UNS Designation:** **G86300H** * **International Equivalents:** * **Europe (DIN/EN):** **1.6523** (34CrNiMo6) with additional hardenability requirements * **ISO:** **ISO 683-18:** Heat-treatable steels, alloy steels * **Japan (JIS):** **SNC630H** (Hardenability-controlled version) * **China (GB):** **30CrNi2MoH** or **30CrNiMoH** --- ### **6. Processing & Heat Treatment Guidelines** * **Typical Annealing Cycle:** - Heat to 830-850°C (1525-1560°F) - Soak 1-2 hours per inch of diameter - Furnace cool at ≤ 20°C/hour to 500°C (930°F) - Air cool to room temperature * **Subsequent Processing Sequence:** 1. **Machining:** Complete all machining operations in annealed state 2. **Stress Relieving:** Optional at 595-650°C (1100-1200°F) for complex parts 3. **Final Heat Treatment:** - *Carburizing:* 900-925°C (1650-1700°F) for case hardening - *Through-Hardening:* 845°C (1550°F) oil quench + temper 4. **Finishing:** Grinding, honing, or polishing as required --- ### **7. Quality Control Parameters** * **Dimensional Tolerance:** Typically ±0.25 mm (±0.010 in.) for diameter * **Straightness:** ≤ 1.5 mm per meter * **Surface Condition:** Free from scale, cracks, and seams * **Microstructure:** Uniform ferrite-pearlite, grain size ASTM 5-7 * **Hardenability Test:** Jominy end-quench test certification available * **Non-Destructive Testing:** Ultrasonic testing for internal defects (optional) --- ### **8. Comparative Analysis: Annealed vs Normalized 8630H** | Parameter | Annealed 8630H (25 mm) | Normalized 8630H (25 mm) | |-----------|------------------------|--------------------------| | **Hardness (HBW)** | 149-179 | 183-212 | | **Machinability** | Excellent | Good | | **Tensile Strength** | 520-655 MPa | 620-757 MPa | | **Tool Life** | 20-30% longer | Standard | | **Distortion Risk** | Minimal | Low | | **Primary Use** | Complex machining | Simpler machining + higher strength | --- ### **Conclusion** **AISI 8630H steel in annealed condition, supplied as 25 mm (1 inch) round bar**, represents the **ideal starting point for precision manufacturing**. It combines the **exceptional machinability of full annealing** with the **performance guarantee of hardenability control**, providing manufacturers with a material that ensures both efficient production and reliable final part performance. The 25 mm diameter offers optimal balance between material availability and machining flexibility, while the "H" designation provides the critical assurance that finished components will achieve consistent mechanical properties after heat treatment. This product is particularly valuable for automotive, aerospace, and high-precision industrial applications where both manufacturing efficiency and part reliability are paramount. -:- For detailed product information, please contact sales. -: AISI 8630H Steel, annealed, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <6327 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 8630H Steel, annealed, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8630H 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 2798 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