AISI 8630H Steel, water quenched

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

AISI 8630H Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8630H Steel, Water Quenched & Tempered (845°C / 480°C)** AISI 8630H is a hardenability-controlled, nickel-chromium-molybdenum low-alloy steel. The "H" designation signifies that the material meets specific end-quench hardenability band requirements, ensuring predictable through-hardening characteristics across production batches. When processed through the aggressive heat treatment of **water quenching from 845°C (1550°F) followed by tempering at 480°C (900°F)**, this steel achieves an exceptional combination of **ultra-high strength, good toughness, and excellent fatigue resistance**. This condition is specifically engineered for heavy-section components or applications requiring maximum as-quenched hardness where oil quenching would be insufficient, with the "H" guarantee ensuring consistent core properties in large cross-sections. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is controlled to guarantee the hardenability band, with permissible variations within ranges. * **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 Distinction:*** The "H" classification prioritizes consistent hardenability (SAE J1268) over strict chemical midpoint adherence, ensuring reliable performance in water quenching. --- ### **2. Physical & Mechanical Properties (Water Quenched & Tempered @ 480°C)** This severe quench produces a fully martensitic structure tempered to high strength levels. * **Hardness:** **375 - 444 HBW** (Approx. 40-46 HRC) * **Tensile Strength:** **1380 - 1650 MPa** (200 - 240 ksi) * **Yield Strength (0.2% Offset):** **1240 - 1520 MPa** (180 - 220 ksi) * **Elongation (in 50 mm):** **10 - 14%** * **Reduction of Area:** **40 - 55%** * **Impact Toughness (Charpy V-Notch):** **27 - 47 J** (20 - 35 ft-lb) at room temperature * **Fatigue Strength (Rotating Beam):** **~620 - 720 MPa** (90 - 105 ksi) * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **205 GPa** (29,700 ksi) * **Guaranteed Hardenability Depth:** Minimum hardness of 40 HRC achievable at significant depth (Jominy position dependent on specific H-band). --- ### **3. Key Features & Performance Advantages** * **Maximum Section Hardening Capability:** Water quenching ensures full martensitic transformation in sections up to 100-125mm (4-5 inches) diameter, far exceeding oil quench capabilities. * **Ultra-High Strength with Maintained Toughness:** Achieves strength levels typically associated with higher-carbon steels while maintaining better impact resistance due to alloy content. * **Superior Fatigue and Wear Resistance:** The fine martensitic structure provides excellent resistance to cyclic loading and abrasive wear. * **Guaranteed Consistency in Heavy Sections:** The "H" hardenability guarantee ensures uniform properties from surface to core in large components - critical for structural integrity. * **Cost-Effective Alternative to More Alloyed Steels:** Provides similar section hardening capability to more expensive alloys through controlled chemistry and severe quenching. * **Temperature Resistance:** Maintains strength at moderately elevated temperatures better than carbon steels. --- ### **4. Primary Applications** This condition is specified for ultra-heavy-duty components requiring maximum strength through thick sections. * **Mining & Construction:** **Drill rods, shovel dipper teeth, crusher components**, and excavator pins (>75mm diameter). * **Oil & Gas:** **Heavy-wall drill collars, large bore valve bodies**, blowout preventer components, and large forged fittings. * **Power Generation:** **Turbine shafts, generator retaining rings**, and large forged couplings for high-torque applications. * **Marine Engineering:** **Propeller shafts, stern tubes**, and large marine hardware requiring through-hardening. * **Heavy Machinery:** **Rolling mill rolls, large gear blanks**, and press components. * **Defense:** **Armor components, large caliber weapon parts**, and naval hardware. --- ### **5. Relevant International Standards & Specifications** * **USA – Governing 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 A434:** *Standard Specification for Steel Bars, Alloy, Hot-Wrought or Cold-Finished, Quenched and Tempered* (Class BB/BC) * **ASTM A788:** *Standard Specification for Steel Forgings, General Requirements* * **UNS Designation:** **G86300H** * **International Equivalents:** * **Europe (DIN/EN):** **1.6523** (34CrNiMo6-4) with additional hardenability requirements * **ISO:** **ISO 683-18:** Heat-treatable steels, alloy steels * **Japan (JIS):** **SNC630H** (Hardenability-controlled version) * **China (GB):** **30CrNi2MoH** --- ### **6. Heat Treatment & Processing Considerations** **Critical Process Parameters:** 1. **Preheating:** 650-700°C (1200-1290°F) mandatory for sections >50mm 2. **Austenitizing:** 845°C ± 10°C (1550°F ± 20°F), 45-60 min/inch 3. **Quenching:** Agitated water or brine at 20-40°C, complete immersion 4. **Tempering:** 480°C ± 10°C (900°F ± 20°F), 2-3 hours/inch, double temper recommended 5. **Stress Relieving:** Optional at 590-620°C (1100-1150°F) for complex geometries **Design & Manufacturing Notes:** - Avoid sharp corners and sudden section changes - Consider stress concentration factors in design - Machining best performed in annealed/normalized state - Final grinding after heat treatment for precision dimensions - Non-destructive testing (UT, MPI) recommended for critical applications --- ### **7. Property Comparison: Water vs Oil Quenched 8630H** | Property | Water Q+T (480°C) | Oil Q+T (480°C) | |----------|-------------------|-----------------| | **Max Hardening Diameter** | 100-125mm | 50-75mm | | **Surface Hardness** | 40-46 HRC | 38-43 HRC | | **Core Hardness (75mm bar)** | 38-42 HRC | 32-36 HRC | | **Tensile Strength** | 1380-1650 MPa | 1240-1450 MPa | | **Impact Toughness** | 27-47 J | 34-54 J | | **Distortion Risk** | High | Moderate | | **Typical Applications** | Ultra-heavy sections | Medium-heavy sections | --- ### **8. Quality Control & Testing** * **Mandatory Testing:** - Jominy end-quench test for hardenability verification - Hardness traverse from surface to core - Tensile testing per ASTM A370 - Charpy impact testing at service temperature * **Recommended Testing:** - Ultrasonic testing for internal discontinuities - Macro-etch test for grain flow and uniformity - Microstructural examination per ASTM E112 - Fracture toughness testing for critical applications --- ### **Conclusion** **AISI 8630H steel in the water quenched and 480°C tempered condition** represents a **specialized high-performance material solution** for applications where **maximum section hardness and ultra-high strength are paramount**. The combination of guaranteed hardenability ("H" grade) with water quenching technology enables manufacturers to produce components with exceptional through-thickness properties in sections where conventional oil quenching would be inadequate. While requiring careful process control and appropriate design considerations to manage quenching stresses, this condition provides an optimal balance of strength and toughness for the most demanding heavy industrial applications. Its consistent performance across production batches makes it particularly valuable for safety-critical components in mining, energy, and heavy machinery sectors where reliability cannot be compromised. -:- For detailed product information, please contact sales. -: AISI 8630H Steel, water quenched 845°C (1550°F), 480°C (900°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6329 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, water quenched 845°C (1550°F), 480°C (900°F) temper Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8630H 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 2800 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