AISI 8630H Steel, normalized

AISI 8630H Steel, normalized Product Information -:- For detailed product information, please contact sales. -: AISI 8630H Steel, normalized Synonyms -:- For detailed product information, please contact sales. -:

AISI 8630H Steel, normalized Product Information -:- For detailed product information, please contact sales. -: **Product Introduction: AISI 8630H Steel, Normalized Condition** AISI 8630H is a hardenability-controlled, nickel-chromium-molybdenum low-alloy steel. The "H" designation signifies that the steel is produced to meet specific end-quench (Jominy) hardenability band requirements, ensuring predictable and consistent depth of hardening regardless of normal melting variations. Supplied in the normalized condition, this material undergoes a grain-refining heat treatment (austenitizing followed by air cooling) that produces a uniform, fine-grained ferrite-pearlite microstructure. This state offers optimized mechanical properties, improved machinability over as-rolled material, and serves as the ideal preparatory condition for components that will undergo final heat treatment such as carburizing, induction hardening, or through-hardening. --- ### **1. Chemical Composition (Typical Weight %, AISI/SAE Standard)** The composition is balanced to guarantee the specified hardenability band, with permissible variations within the ranges to achieve this goal. * **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 *Core Distinction of "H" Grade:* Unlike standard 8630, the exact chemical composition may vary slightly from heat to heat, but the final product is guaranteed to fall within the standardized hardenability band defined in SAE J1268, ensuring consistent performance in final heat treatment. --- ### **2. Physical & Mechanical Properties (Normalized Condition)** Normalization provides a homogeneous structure with the following representative properties: * **Hardness:** **183 - 212 HBW** (Brinell) * **Tensile Strength:** **620 - 757 MPa** (90 - 110 ksi) * **Yield Strength (0.2% Offset):** **415 - 550 MPa** (60 - 80 ksi) * **Elongation (in 50 mm):** **22 - 28%** * **Reduction of Area:** **50 - 60%** * **Impact Toughness (Charpy V-Notch):** Typically **41 - 68 J** (30 - 50 ft-lb) at room temperature * **Machinability:** **Good** (approximately 65% of a 1% carbon steel standard). The uniform normalized structure provides consistent tool life and surface finish. * **Density:** **7.85 g/cm³** (0.284 lb/in³) * **Modulus of Elasticity:** **205 GPa** (29,700 ksi) --- ### **3. Key Features & Advantages** * **Guaranteed Hardenability (The "H" Advantage):** The primary benefit. Designers and heat treaters can rely on consistent depth of hardness and microstructural transformation during final quenching, reducing scrap and ensuring part performance across production batches. * **Refined & Uniform Microstructure:** Eliminates the coarse, non-uniform grain structure from hot working, leading to more isotropic mechanical properties and better impact toughness. * **Improved Machinability:** Offers better and more consistent chip formation and lower cutting forces compared to the as-rolled condition, reducing manufacturing costs. * **Stress Relief:** Reduces internal stresses from forging or rolling, minimizing the risk of distortion during subsequent machining or heat treatment. * **Ideal Pre-Condition for Final Heat Treatment:** Provides a clean, predictable, and homogeneous starting structure for processes like carburizing or through-hardening, leading to more uniform case depth, core properties, and minimal distortion. * **Good Weldability:** The controlled chemistry and normalized structure allow for good weldability with appropriate pre-heat and post-weld heat treatment procedures. --- ### **4. Primary Applications** AISI 8630H normalized is the preferred starting material for critical, high-performance components that require reliable and consistent final heat treatment response. * **Gears and Pinions:** Blank stock for automotive transmissions, aerospace gearboxes, and industrial machinery that will be **case carburized**. The "H" grade ensures consistent case-core interface and hardenability after carburizing. * **Heavy-Duty Shafts and Axles:** Precursor material for axle shafts, PTO shafts, and crankshafts that will be through-hardened or induction hardened. * **Aerospace Components:** Critical structural parts, landing gear components (prior to final heat treatment), and engine parts where material consistency is non-negotiable. * **Oil & Gas Equipment:** Gears, heavy-duty fasteners, and valve components for downhole and surface equipment. * **General High-Strength Components:** Any part requiring a reliable, predictable response to final quenching and tempering. --- ### **5. Relevant International Standards & Specifications** * **USA – The Governing Standards for "H" Steels:** * **ASTM A304:** *Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements* – This is the key material specification. * **SAE J1268:** *Hardenability Bands for H-Steels* – Defines the guaranteed hardenability limits. * **SAE J404:** *Chemical Compositions of SAE Alloy Steels*. * **AMS 2300/2301/2304:** Often invoked for aerospace quality to ensure steel cleanliness (freedom from deleterious inclusions). * **UNS Designation:** **G86300H** * **International Equivalents:** * The "H" concept is primarily North American. European and ISO standards typically specify hardenability through prescribed chemical ranges and/or Jominy test values agreed upon between supplier and customer. * **Europe (DIN / EN):** **1.6523** (34CrNiMo6) is a close compositional equivalent, but not an exact "H" grade match. * **International (ISO):** **ISO 683-18** covers similar alloy steels. * **Japan (JIS):** **SNC630H** represents the hardenability-controlled version. --- ### **6. Typical Normalization & Subsequent Processing** * **Normalizing Process:** Heat uniformly to **870°C - 900°C (1600°F - 1650°F)**, soak, then cool in still air. * **Next Steps:** After machining the normalized blank, components typically undergo: 1. **Carburizing:** For case-hardened gears and bearings. 2. **Through-Hardening:** Austenitize, quench, and temper for high-strength shafts. 3. **Induction Hardening:** For localized surface hardening of specific areas like bearing journals. --- ### **Conclusion** **AISI 8630H steel in the normalized condition** is more than just a material; it is a **quality and performance assurance system**. It combines the **microstructural benefits of normalization** (uniformity, machinability, stress relief) with the **critical engineering guarantee of controlled hardenability**. This makes it the standard choice for manufacturers of high-value, safety-critical components, particularly in the automotive, aerospace, and energy sectors, where consistent heat treatment results are vital for performance, reliability, and cost control. It ensures that the final hardened part will perform as designed, batch after batch. -:- For detailed product information, please contact sales. -: AISI 8630H Steel, normalized Specification Dimensions Size： Diameter 20-1000 mm Length <6325 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, normalized Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8630H Steel, normalized -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8630H Steel, normalized -:- For detailed product information, please contact sales. -:

Packing of AISI 8630H Steel, normalized -:- 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 2796 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