AISI 8630 Steel, water quenched

AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Product Information -:- For detailed product information, please contact sales. -: AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Synonyms -:- For detailed product information, please contact sales. -:

AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 8630 Steel, Water Quenched & Tempered (845°C / 480°C)** AISI 8630 is a versatile nickel-chromium-molybdenum low-alloy steel, commonly oil-quenched to balance hardenability and distortion risk. The specific heat treatment of **water quenching from 845°C (1550°F) followed by tempering at 480°C (900°F)** represents a **high-severity process** designed to achieve **maximum hardness and strength** in thinner sections or for applications demanding the highest possible as-quenched hardness. This condition leverages the alloy's inherent hardenability while employing a faster quench medium (water) to produce a fully martensitic structure, subsequently tempered to develop an exceptional balance of ultra-high strength and usable toughness. It is critical for the most demanding applications where weight savings and resistance to extreme loads are paramount. **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition provides the hardenability necessary to withstand a severe water quench without excessive cracking risk. * **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 (Water Quenched & Tempered @ 480°C)** This process yields a very fine, high-strength tempered martensite. Properties are highly section-sensitive. * **Typical Hardness:** **Rockwell C 40 - 46 HRC** (Approx. Brinell 375 - 440 HBW). *Note: Significantly higher than oil-quenched equivalents.* * **Tensile Strength:** **1380 - 1655 MPa** (200 - 240 ksi) * **Yield Strength (0.2% Offset):** **1240 - 1520 MPa** (180 - 220 ksi) * **Elongation (in 50 mm):** **10 - 14%** * **Reduction of Area:** **35 - 50%** * **Impact Toughness (Charpy V-Notch):** **20 - 34 J (15 - 25 ft-lb)** at room temperature. While lower than oil-quenched tempers, it remains substantial given the extreme strength level. * **Fatigue Strength:** **~620 - 690 MPa** (90 - 100 ksi) – Exceptionally high due to the high tensile strength and fine microstructure. * **Density:** 7.85 g/cm³ * **Modulus of Elasticity:** 205 GPa (29,700 ksi) **3. Key Features & Performance Characteristics** * **Maximum Achievable Strength:** Water quenching achieves the highest possible as-quenched hardness for this alloy, resulting in the highest tensile and yield strengths after tempering. * **High Hardenability Utilization:** Fully exploits the Ni-Cr-Mo alloy system's potential, allowing through-hardening of thicker sections with water than would be possible with a plain carbon steel. * **Severe Quench Sensitivity:** The water quench introduces high thermal gradients and significant stress. **Component design is critical** – simple, symmetrical shapes with no sharp corners are essential to minimize cracking and distortion. * **Good Wear and Abrasion Resistance:** The high base hardness provides excellent resistance to surface degradation. * **Trade-off:** Achieves supreme strength at the expense of some toughness and with significantly higher risk of distortion/quench cracks compared to oil quenching. **4. Primary Applications** This condition is reserved for **high-stress, critical components** where minimizing cross-section (for weight savings) or achieving absolute maximum strength is the design driver, and the associated processing risks are managed. * **Military & Aerospace:** **Armor plate components**, ballistic inserts, lightweight artillery parts, and ultra-high-strength fasteners (e.g., special-purpose bolts). * **Oil & Gas:** **Drill bit bodies**, shock-resistant tooling, and heavy-duty wear plates in drilling assemblies where extreme abrasion and impact occur. * **Mining & Earthmoving:** **Cutter teeth**, excavator bucket tips, and dredger components subjected to severe impact-abrasive wear. * **High-Performance Automotive:** **Racing transmission gears** (for through-hardening), **competition axle shafts**, and **suspension components** where weight and strength are optimized. * **Tooling:** **Heavy-duty punches**, dies, and forming tools requiring extreme pressure resistance without case hardening. **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 (can specify liquid quenching). * **SAE J404:** Chemical Compositions of SAE Alloy Steels. * **AMS 6320:** Often specifies oil quenching; water quenching would be a special engineering requirement. * **UNS Designation:** **G86300** * **International Equivalents:** * **Europe (DIN / EN):** **34CrNiMo6** (1.6582). Water quenching is less common and typically a special process specification. * **International (ISO):** **ISO 683-18**. * **Japan (JIS):** **SNCM630**. **6. Heat Treatment Process Specifics & Critical Warnings** * **Preheat:** **Essential.** Preheat at 650-700°C (1200-1290°F) to reduce thermal shock. * **Austenitize:** **845°C ± 10°C (1550°F ± 20°F)**. Use protective atmosphere to prevent decarburization. * **Quench:** **Agitated warm water or brine.** Temperature control of the quenchant is critical. Quench completely to below 65°C (150°F). **Risk of cracking is high.** * **Temper:** **Immediately** after quenching. **480°C ± 10°C (900°F ± 20°F)** for 1-2 hours per inch, then air cool. **Double tempering is MANDATORY** to relieve extreme quenching stresses, improve toughness, and stabilize dimensions. * **Design Rule:** Avoid sharp corners, sudden section changes, and non-uniform geometries. **Conclusion** **AISI 8630 steel, water quenched and tempered at 480°C, is a specialist, high-performance condition** that pushes the alloy to its ultimate strength limits. It is not a general-purpose treatment but rather a **targeted engineering solution** for applications where the premium on strength outweighs the increased manufacturing risk and cost. Successful implementation requires meticulous control over part design, heat treatment process, and tempering practice. When applied correctly to suitable components, it delivers an unmatched strength profile for a low-alloy steel, enabling breakthrough performance in extreme-duty military, aerospace, and heavy industrial applications. -:- For detailed product information, please contact sales. -: AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6319 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, water quenched 845°C (1550°F), 480°C (900°F) temper Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°F) temper -:- For detailed product information, please contact sales. -:

Packing of AISI 8630 Steel, water quenched 845°C (1550°F), 480°C (900°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 2790 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