AISI 8620H Steel Sheet,Plate,

AISI 8620H Steel Sheet/Plate, annealed 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 8620H Steel Sheet/Plate, annealed 13 mm (0.5 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 8620H Steel, annealed 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: ## **Product Specification: AISI 8620H Controlled-Hardenability Steel (Annealed Condition)** ### **Product Designation** * **Standard Name:** AISI 8620H / SAE 8620H * **UNS Number:** G86200 (with Hardenability Certification) * **Condition:** **Annealed** (Spheroidize Annealed) * **Product Form:** Hot-rolled or cold-finished steel bar * **Specified Size:** **13 mm (0.5 inch) diameter round** * **Key Feature:** **Certified to a guaranteed hardenability band per ASTM A304** ### **Overview** AISI 8620H is the **hardenability-controlled ("H"-grade) variant** of the ubiquitous AISI 8620 nickel-chromium-molybdenum case-hardening steel. Supplied in the **annealed condition** as a 13 mm round, it offers the same excellent machinability as standard 8620, but with the critical addition of **lot-to-lot consistency in heat treatment response**. The "H" designation guarantees that the steel's Jominy end-quench curve falls within a narrow, standardized band (ASTM A304), ensuring predictable and uniform core hardness, strength, and case depth after carburizing. This makes it the premium choice for high-volume, critical components where performance reliability and manufacturing repeatability are non-negotiable. --- ### **1. Chemical Composition (Range by Weight %, ASTM A304)** The composition ranges for 8620H are carefully controlled to achieve the specified hardenability band. It is chemically identical to standard 8620 but produced to tighter compositional aims. | Element | 8620H Range (%) | Role & Effect | | :--- | :--- | :--- | | **Carbon (C)** | 0.18 - 0.23 | Base element for core strength. Tight control ensures consistent case carbon potential and core hardness. | | **Manganese (Mn)** | 0.70 - 0.95 | Primary hardenability agent; range is optimized to precisely control the slope of the Jominy curve. | | **Phosphorus (P)** | ≤ 0.030 | Impurity; controlled at very low levels. | | **Sulfur (S)** | ≤ 0.035 | Impurity; low level ensures good transverse ductility. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and solid solution strengthener. | | **Nickel (Ni)** | 0.40 - 0.70 | Ensures superior and consistent core toughness across all production lots. | | **Chromium (Cr)** | 0.40 - 0.65 | Enhances case hardenability; range controlled for uniform case formation. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Critical for grain refinement and core hardenability control; ensures consistent response to the carburizing cycle. | | **Iron (Fe)** | Balance | | ***Procurement Basis:*** Material is purchased to **SAE 8620H** with certification to **ASTM A304**. The mill test report includes the actual Jominy hardenability test results, verifying the lot conforms to the published band for 8620H. --- ### **2. Physical & Mechanical Properties (Annealed Condition - 13 mm round)** **A. Physical Properties (Typical)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Elastic Modulus (E):** ~205 GPa (29.7 x 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** ~51.5 W/m·K * **Coefficient of Thermal Expansion:** 11.5 x 10⁻⁶ /K (20-100°C) **B. Mechanical Properties (As-Annealed)** *Typical for a spheroidize-annealed 13 mm round, ready for precision machining.* * **Hardness (Brinell):** 149 - 179 HB * **Hardness (Rockwell):** ~80 - 88 HRB * **Tensile Strength:** 500 - 655 MPa (73 - 95 ksi) * **Yield Strength (0.2% Offset):** 365 MPa (53 ksi) min. * **Elongation in 50 mm:** 25% min. * **Machinability:** **Excellent.** Identical to standard 8620 (~65% of 1006 steel). The consistent microstructure from lot-to-lation further enhances machining predictability. **C. Guaranteed Hardenability & Post-Treatment Consistency** * **Governing Standard:** **ASTM A304** * **Assurance:** The core hardness of a 13 mm round after oil quenching from the carburizing temperature will fall within a predictable, narrow range (typically ~25-35 HRC for this diameter). * **Key Benefit:** **Minimized distortion and property scatter.** Predictable core hardenability leads to uniform volume changes during quenching, reducing part distortion and the need for extensive post-heat-treatment straightening or sorting. --- ### **3. Product Applications** The 8620H annealed 13 mm round is specified for high-volume, precision components where **consistent heat treatment results directly impact performance, assembly, and cost.** * **High-Volume Automotive Transmission & Drivetrain:** * **Critical Gears:** Synchronizer hubs, rings, and gears in automatic and manual transmissions where consistent hardness ensures smooth shifting and long life. * **Precision Shafts:** Input, output, and counter shafts where uniform core properties prevent bending and ensure balanced dynamic performance. * **Aerospace Actuation Systems:** * Gears, pins, and shafts in flight control actuators requiring certified material consistency and predictable response to case hardening. * **Hydraulic & Fuel System Components:** * Pump gears, shafts, and valve parts where consistent wear resistance and dimensional stability are critical for pressure and flow control. * **Industrial Robotics & Precision Gearing:** * High-cycle, low-backlash gears and drive components in automated systems where performance uniformity across thousands of parts is essential. --- ### **4. International Standards & Designations** The "H"-grade system is a North American standard. Functional equivalents exist but may not have identical hardenability certification protocols. | Standard System | Designation | Notes / Key Comparison | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **SAE 8620H** | The standard "H"-grade designation. | | **ASTM (USA)** | **ASTM A304** (G86200H) | Governing standard for H-band requirements. Also under **ASTM A914** for bars. | | **UNS (USA)** | **G86200** (with H spec) | UNS number is the same; "H" is a procurement requirement. | | **DIN / EN (Germany/EU)** | **No direct H-equivalent.** Base grade: **1.6523 (20NiCrMo2-2)**. | The chemical equivalent is 20NiCrMo2-2. Similar consistency is achieved through "special steel" quality agreements with additional hardenability verification per customer drawing (e.g., to **SEP 1664**). | | **JIS (Japan)** | **SNC822H** | The Japanese standard **does define an "H" grade** for this steel (JIS G4102), making **SNC822H** the closest direct international equivalent. | | **GB (China)** | **20CrNiMoH** | Chinese standards (GB/T 5216) also include "H" designations for hardenability-guaranteed steels, making this a direct functional match. | --- ### **Key Advantages & Manufacturing Value** 1. **Reduced Scrap & Rework:** Eliminates heat treatment-related rejects due to material variability, lowering overall unit cost. 2. **Optimized Process Design:** Enables the design of more aggressive, cost-effective carburizing and quenching cycles with less safety margin, as material response is guaranteed. 3. **Improved Gear Performance:** Consistent core hardness directly translates to uniform bending fatigue strength and predictable tooth deflection across all gears in a set or production run. 4. **Supply Chain Assurance:** Provides OEMs with a validated material standard, simplifying supplier qualification and incoming material inspection. ### **Summary** **AISI 8620H in annealed 13 mm (0.5 inch) round** represents the **premium, consistency-ensured version of the industry's most trusted case-hardening steel**. It transforms 8620 from an excellent general-purpose material into a **precision-engineered manufacturing input**. By guaranteeing hardenability, it provides measurable benefits in part quality, production yield, and long-term performance reliability for high-volume, critical components. This product is specified when the cost of performance variation or field failure far exceeds the modest material premium, making it essential for advanced automotive drivetrains, aerospace systems, and other high-stakes applications. Its direct equivalents, **JIS SNC822H** and **GB 20CrNiMoH**, confirm its status as a globally recognized standard for quality. -:- For detailed product information, please contact sales. -: AISI 8620H Steel, annealed 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <4149 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 8620H Steel, annealed 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 8620H Steel Sheet,Plate, annealed 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 8620H Steel Sheet,Plate, annealed 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 8620H Steel Sheet/Plate, annealed 13 mm (0.5 in.) round -:- 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 Sheet/Plate 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 620 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