AISI 8630H Steel Tube,Pipe

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

AISI 8630H Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 8630H Steel, Oil Quenched & Tempered (845°C / 455°C)** AISI 8630H is a hardenability-controlled nickel-chromium-molybdenum low-alloy steel. The "H" designation guarantees that the steel meets specific end-quench hardenability band requirements, ensuring consistent and predictable depth of hardening regardless of normal production variations. 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 excellent toughness**. This specific condition leverages the guaranteed hardenability to produce uniform mechanical properties throughout the cross-section, making it a premium choice for critical components subjected to high dynamic and static loads. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is controlled to ensure compliance with hardenability band requirements rather than strict 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 Distinction:*** While these are the aim ranges, the "H" classification permits controlled variations to ensure the steel consistently meets the standardized hardenability band (SAE J1268), providing reliable through-hardening performance. --- ### **2. Physical & Mechanical Properties (Oil Quenched & Tempered @ 455°C)** This treatment produces a fine tempered martensitic structure with exceptional strength-toughness balance. * **Hardness:** **341 - 401 HBW** (Approx. 35-42 HRC) * **Tensile Strength:** **1170 - 1380 MPa** (170 - 200 ksi) * **Yield Strength (0.2% Offset):** **1030 - 1240 MPa** (150 - 180 ksi) * **Elongation (in 50 mm):** **14 - 18%** * **Reduction of Area:** **50 - 60%** * **Impact Toughness (Charpy V-Notch):** **34 - 54 J** (25 - 40 ft-lb) at room temperature * **Fatigue Strength (Rotating Beam):** **~550 - 650 MPa** (80 - 94 ksi) * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **205 GPa** (29,700 ksi) * **Hardenability Guarantee:** The "H" designation ensures consistent Jominy curve profile, providing uniform properties in sections up to approximately 75mm (3 inches) diameter when oil quenched. --- ### **3. Key Features & Performance Advantages** * **Guaranteed Through-Hardening Consistency:** The "H" grade ensures predictable hardness penetration and microstructural transformation in oil quenching, eliminating soft spots and ensuring uniform mechanical properties in medium to heavy sections. * **Optimized Strength-Toughness Balance:** The 455°C temper provides an exceptional compromise between high yield strength and good impact resistance, making it resistant to both deformation and brittle fracture. * **Superior Fatigue Performance:** The combination of high strength, fine microstructure, and uniform properties results in excellent fatigue resistance and endurance limit. * **Excellent Dimensional Control:** Oil quenching minimizes distortion compared to water quenching, while the 455°C temper provides effective stress relief. * **Reliable Performance in Heavy Sections:** The guaranteed hardenability makes this specification ideal for components where consistent core properties are critical in thicker cross-sections. * **Good Wear Resistance:** The hardness level provides substantial resistance to abrasion and adhesive wear. --- ### **4. Primary Applications** This condition is specified for critical components where consistent performance and reliability are paramount. * **Aerospace:** **Aircraft landing gear components**, engine mounts, critical structural bolts, and flight control actuators. * **Oil & Gas:** **Drill collars**, tool joints, heavy-duty wellhead components, high-pressure valve stems, and sucker rods. * **Heavy Machinery:** **Track rollers**, final drive gears, connecting rods, crane hooks, and mining equipment components. * **Power Transmission:** **Heavy-duty shafts**, gears requiring high core strength, and industrial clutch components. * **Defense:** **Weapon system components**, armored vehicle parts, and high-stress military hardware. * **High-Performance Automotive:** **Racing components**, high-strength fasteners, and suspension parts. --- ### **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* * **AMS 6320:** *Steel Bars, 0.30C-0.60Cr-0.55Ni-0.25Mo (8630) Consumable Electrode Melted* * **UNS Designation:** **G86300H** * **International Equivalents:** * **Europe (DIN/EN):** **1.6523** (34CrNiMo6-4) with specific hardenability agreements * **ISO:** **ISO 683-18:** Heat-treatable steels, alloy steels and free-cutting steels * **Japan (JIS):** **SNC630H** (Hardenability-controlled version) * **China (GB):** **30CrNi2MoH** or **30CrNiMoH** --- ### **6. Heat Treatment Parameters & Quality Control** * **Preheating:** 650-700°C (1200-1290°F) recommended for sections >50mm * **Austenitizing:** 845°C ± 10°C (1550°F ± 20°F), 30 minutes per inch minimum * **Quenching:** Agitated fast oil at 40-60°C (104-140°F) * **Tempering:** 455°C ± 10°C (850°F ± 20°F), 2 hours per inch minimum, air cool * **Quality Verification:** - Hardness testing at multiple locations (surface and core) - Jominy end-quench test for hardenability verification - Microstructural examination per ASTM E112 - Charpy impact testing at service temperature - Tensile testing per ASTM A370 --- ### **7. Comparison with Standard 8630 (Non-H Grade)** | Property | AISI 8630H (Q&T 455°C) | Standard 8630 (Q&T 455°C) | |----------|------------------------|---------------------------| | **Hardenability** | Guaranteed band | Normal chemical range only | | **Property Uniformity** | Excellent in heavy sections | May vary in thick sections | | **Heat Treatment Predictability** | High consistency | Process sensitive | | **Quality Assurance** | Full hardenability testing | Chemical analysis only | | **Typical Applications** | Critical, safety components | General engineering parts | --- ### **8. Special Processing Considerations** 1. **Double Tempering:** Recommended for maximum stress relief and toughness 2. **Sub-Zero Treatment:** Optional for critical applications to transform retained austenite 3. **Straightening:** Performed between tempering cycles when necessary 4. **Surface Protection:** Required during heat treatment to prevent decarburization 5. **Non-Destructive Testing:** MPI or UT recommended for critical components --- ### **Conclusion** **AISI 8630H steel in the oil quenched and 455°C tempered condition** represents a **premium engineering material solution** where **performance reliability and consistency are non-negotiable**. The guaranteed hardenability ensures that critical components will achieve uniform properties throughout their cross-section, providing designers with unprecedented confidence in part performance. This condition delivers an exceptional balance of high strength (1030-1240 MPa yield) with good toughness (34-54 J impact), making it particularly valuable for aerospace, defense, and energy applications where component failure is unacceptable. The combination of nickel, chromium, and molybdenum provides not only excellent hardenability but also good corrosion resistance and fatigue performance, establishing this material as a top choice for the most demanding engineering applications. -:- For detailed product information, please contact sales. -: AISI 8630H Steel, oil quenched 845°C (1550°F), 455°C (850°F) temper Specification Dimensions Size： Diameter 20-1000 mm Length <6326 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, oil quenched 845°C (1550°F), 455°C (850°F) temper Properties -:- For detailed product information, please contact sales. -:

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

Packing of AISI 8630H Steel Tube, 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 Tube 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 2797 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