AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper

AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 8630 Steel, Oil Quenched & Tempered (845°C / 455°C)** AISI 8630 is a nickel-chromium-molybdenum low-alloy steel known for its excellent hardenability, strength, and toughness. When subjected to the precise heat treatment of oil quenching from 845°C (1550°F) followed by tempering at 455°C (850°F), it achieves an optimal combination of **high strength and good impact resistance**. This specific tempering temperature balances the inherent toughness of the alloy with substantial yield strength, making it ideal for components subjected to high static and dynamic loads where resistance to deformation and fracture are equally critical. **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition provides deep hardenability and strong secondary hardening response. * **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 * *Key Feature:* The Ni-Cr-Mo combination ensures excellent through-hardening in moderate to heavy sections and contributes to good low-temperature toughness. **2. Physical & Mechanical Properties (Oil Quenched & Tempered @ 455°C)** This treatment produces a fine, tempered martensitic microstructure with the following representative properties: * **Typical Hardness:** **Rockwell C 36 - 42 HRC** (Approx. Brinell 331 - 388 HBW) * **Tensile Strength:** **1170 - 1380 MPa** (170 - 200 ksi) * **Yield Strength (0.2% Offset):** **1030 - 1240 MPa** (150 - 180 ksi) * **Elongation (in 50 mm):** **15 - 18%** * **Reduction of Area:** **50 - 60%** * **Impact Toughness (Charpy V-Notch):** Typically **34 - 54 J (25 - 40 ft-lb)** at room temperature. Maintains good toughness at sub-zero temperatures. * **Fatigue Strength (Rotating Beam):** ~ **550 - 620 MPa** (80 - 90 ksi) - Excellent due to high strength and clean microstructure. * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 205 GPa (29,700 ksi) **3. Key Features & Performance Characteristics** * **High Strength-to-Toughness Balance:** The 455°C temper provides a near-optimal compromise, offering very high yield strength while retaining substantial ductility and impact energy. * **Excellent Fatigue and Endurance Limit:** The high core strength combined with the alloying elements' effect on grain refinement results in exceptional resistance to cyclic loading. * **Good Hardenability:** The Ni-Cr-Mo composition allows for full through-hardening of sections several inches thick with oil quenching, ensuring uniform core properties. * **Resistance to Quench Cracking:** Lower carbon content compared to higher-carbon alloys (e.g., 86B45) reduces the risk of cracking during quenching, especially in complex shapes. * **Good Wear Resistance:** The high hardness provides good resistance to abrasion and adhesive wear. **4. Primary Applications** This heat-treated condition is specified for **high-stress, structural components** that must withstand heavy loads, shock, and fatigue. * **Oil & Gas Industry:** **Drill collars**, tool joints, heavy-duty wellhead components, valve stems, and high-pressure fitting bodies. * **Heavy Machinery & Off-Highway:** **Track rollers**, final drive pinions, axle shafts, crane hooks, high-strength bolts (ASTM A490 type performance), and heavily loaded connecting rods. * **Aerospace:** **Aircraft landing gear components** (non-case-hardened parts), engine mounts, and critical structural bolts and fittings. * **Power Transmission:** **Large gears and shafts** that require high core strength to support case-hardened surfaces or resist bending loads. * **Defense:** Components for armored vehicles and artillery where a balance of hardness and toughness is required. **5. Relevant International Standards & Specifications** * **USA – Primary Standards:** * **ASTM A322:** Standard Specification for Steel Bars, Alloy, Standard Grades. * **ASTM A434:** Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered. * **SAE J404:** Chemical Compositions of SAE Alloy Steels. * **AMS 6320:** Steel Bars, 0.30C - 0.60Cr - 0.55Ni - 0.25Mo (8630), Consumable Electrode Melted, Normalized and Tempered. * **UNS Designation:** **G86300** * **International Equivalents:** * **Europe (DIN / EN):** **34CrNiMo6** (1.6582) is a common, slightly higher-strength equivalent. The heat-treated condition is specified separately (e.g., QT 1100 - tempering at ~600°C for similar strength). * **International (ISO):** **ISO 683-18** covers comparable alloy engineering steels. * **Japan (JIS):** **SNCM630** (0.30C Ni-Cr-Mo steel) is a very close equivalent. **6. Heat Treatment Process Specifics** * **Preheat:** Recommended at 650-700°C (1200-1290°F) to minimize thermal stress. * **Austenitize:** **845°C ± 10°C (1550°F ± 20°F)**. Hold for sufficient time (typically 30 min/inch of thickness). * **Quench:** Agitated oil quench to below 65°C (150°F). * **Temper:** **Immediately** after quenching. Heat to **455°C ± 10°C (850°F ± 20°F)**, hold for 1-2 hours per inch of thickness, then air cool. **Double tempering** is highly recommended for maximum stress relief and property uniformity. **Conclusion** AISI 8630 steel, oil quenched and tempered at 455°C, is a **high-performance structural alloy** engineered for the most demanding applications. It delivers an outstanding synergy of **very high strength, good toughness, and superior fatigue life**, outperforming standard carbon steels and many lower-alloy grades. Its reliability in heavy sections and complex geometries, combined with a lower risk of quench cracking, makes it a preferred choice for mission-critical components in the energy, heavy equipment, and aerospace industries where failure is not an option. This condition fully leverages the alloy's Ni-Cr-Mo chemistry to provide a robust and predictable material solution for extreme operating conditions. -:- For detailed product information, please contact sales. -: AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6316 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, oil quenched 845°C (1550°F), 455°C (850°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 8630 Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper -:- 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 2787 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