AISI 94B30H Steel, UNS H94301

AISI 94B30H Steel, UNS H94301 (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: AISI 94B30H Steel, UNS H94301 (Composition Spec) Synonyms -:- For detailed product information, please contact sales. -:

AISI 94B30H Steel, UNS H94301 (Composition Spec) Product Information -:- For detailed product information, please contact sales. -: # **Product Datasheet: AISI 94B30H Alloy Steel - Hardenability-Grade (UNS H94301)** ## **1. Product Overview** **AISI 94B30H (UNS H94301)** is a **hardenability-controlled, medium-carbon boron-treated alloy steel** specified under the "H-band" (hardenability band) designation system. This variant is chemically identical to standard 94B30 but is produced with tighter compositional controls and mandatory hardenability testing to ensure predictable and consistent depth of hardening after heat treatment. The "H" designation guarantees that the steel's hardenability, primarily influenced by its boron content, falls within a predetermined range defined by Jominy end-quench test data. This makes 94B30H the preferred choice for critical components where uniform mechanical properties throughout a part's cross-section are essential for performance and reliability. ## **2. International Standards & Designations** | System/Authority | Designation | Standard Title / Specification | | :--- | :--- | :--- | | **UNS** | **H94301** | Unified Numbering System for Metals | | **AISI / SAE** | **94B30H** | Standard H-Band Steel Designation | | **SAE** | J1268, J1868 | Hardenability Bands for Alloy Steels | | **ASTM** | A304 | Standard Specification for Steel Bars, Alloy, Subject to End-Quench Hardenability Requirements | | **ASTM** | A29/A29M | General Specification for Steel Bars, Alloy, Hot-Wrought and Cold-Finished (H-grade applicable) | | **AMS** | 6320 | Aerospace Material Specification (May be invoked for H-grade quality) | | **Common Names** | Boron H-Steel, Hardenability-Banded 94B30, Guaranteed Hardenability Steel | ## **3. Chemical Composition (% by Weight)** The composition is similar to standard 94B30 but controlled to a narrower range to achieve the specified hardenability band. **The defining characteristic is the guaranteed hardenability, not a unique chemistry.** | Element | AISI/SAE 94B30H Range (Typical) | UNS H94301 Reference | Primary Function | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.28 - 0.33 | 0.28 - 0.33 | Primary strength and hardness contributor. | | **Manganese (Mn)** | 0.75 - 1.00 | 0.75 - 1.00 | Enhances hardenability and strength. | | **Phosphorus (P)** | ≤ 0.035 | ≤ 0.035 | Residual element (controlled impurity). | | **Sulfur (S)** | ≤ 0.040 | ≤ 0.040 | Improves machinability; level controlled. | | **Silicon (Si)** | 0.20 - 0.35 | 0.15 - 0.35 | Deoxidizer, solid solution strengthener. | | **Chromium (Cr)** | 0.35 - 0.65 | 0.35 - 0.65 | Boosts hardenability, wear, and corrosion resistance. | | **Molybdenum (Mo)** | 0.08 - 0.15 | 0.08 - 0.15 | Potent hardenability agent, refines grain. | | **Boron (B)** | 0.0005 - 0.003** | 0.0005 - 0.003 | **Key Element:** Radically increases hardenability efficiency at very low levels. | | **Iron (Fe)** | Balance | Balance | Base metal. | ****Note on Boron:** The effectiveness of boron is highly sensitive to its "active" form. Production of H-grades includes practices to protect boron from forming nitrides/oxides, ensuring consistent hardenability. The specified hardenability band accounts for this. ## **4. Hardenability & Typical Mechanical Properties** **Core Distinction:** 94B30H is purchased based on its **Jominy Hardenability Band**. The supplier provides certification that the material meets the specified distance-from-quenched-end (DFE) hardness ranges per SAE J1268. * **Condition as Supplied:** Typically hot-rolled or cold-finished, often annealed for machinability. The guarantee is for its *potential* after austenitizing and quenching. * **Hardenability Band:** Complies with SAE J1868 specified limits for 94B30H. This band defines the minimum and maximum Rockwell C hardness values expected at specific points on a Jominy test bar. * **Post-Quench & Temper Potential:** After proper heat treatment (e.g., austenitize at 845-870°C / 1550-1600°F, oil quench, and temper), components can achieve: * **Tensile Strength:** 1000 - 1300 MPa (145 - 190 ksi) (dependent on tempering temperature) * **Hardness:** 30 - 45 HRC (typical tempered range) * **Core Properties:** The H-grade ensures that the hardness gradient from surface to center in a given section size is predictable and within acceptable limits for the design. ## **5. Key Features & Advantages** * **Predictable Heat Treatment Response:** Guarantees a defined range of hardness at the center of a specified diameter bar after quenching, eliminating "guesswork" in heat treatment design. * **Consistent Part Performance:** Ensures uniform strength and toughness throughout the cross-section of critical parts, reducing risk of failure in service. * **Design & Processing Reliability:** Allows engineers to design with confidence for load-bearing components and enables heat treaters to establish repeatable, robust processes. * **Material & Cost Efficiency:** Reduces the need for over-design or the use of more expensive alloy steels to achieve through-hardening in larger sections. * **Traceability & Certification:** Each heat/lot is tested and certified for hardenability, providing full traceability for quality-critical applications. ## **6. Primary Applications** 94B30H is specified for high-integrity, load-bearing components where consistent core properties are non-negotiable. * **Automotive Safety & Driveline:** **High-strength axle shafts, steering linkage components (tie rods, pitman arms), transmission gears and shafts, connecting rods (for some designs), and critical suspension bolts.** * **Heavy-Duty & Off-Highway:** **Drive pinions, differential gears, planetary carriers, track roller pins, and other high-wear, high-stress components in agricultural and construction machinery.** * **Industrial Gearing:** **Medium-to-large sized gears requiring good through-hardening for tooth strength and durability.** * **Fluid Power:** **High-pressure hydraulic piston rods and pump components where fatigue resistance is critical.** ## **7. Processing Guidelines** * **Heat Treatment (Quench & Temper):** **The primary intended processing step.** Austenitize in a controlled (preferably protective) atmosphere to protect boron. Oil quenching is standard. Follow by tempering to desired hardness/strength. * **Machining:** Performed in the softened (typically annealed) supplied condition prior to final heat treatment. Machinability is good, similar to standard 94B30. * **Welding:** **Not generally recommended for finished, heat-treated components.** If welding is necessary on material in the annealed state, use low-hydrogen processes with high preheat (200-300°C / 400-575°F) and mandatory post-weld stress relieving or re-heat treatment. The HAZ will have altered hardenability. * **Forging:** Can be hot forged. Must be subsequently re-austenitized and quenched to realize the guaranteed hardenability properties. ## **8. Compliance & Certification** Material is supplied with a **test report certifying compliance with ASTM A304**, which includes: * Chemical analysis results. * **Jominy end-quench hardenability test results**, showing the actual hardness values fall within the specified SAE band for 94B30H. * This certification is the fundamental quality document distinguishing it from non-H-grade material. -:- For detailed product information, please contact sales. -: AISI 94B30H Steel, UNS H94301 (Composition Spec) Specification Dimensions Size： Diameter 20-1000 mm Length <6398 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 94B30H Steel, UNS H94301 (Composition Spec) Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 94B30H Steel, UNS H94301 (Composition Spec) -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 94B30H Steel, UNS H94301 (Composition Spec) -:- For detailed product information, please contact sales. -:

Packing of AISI 94B30H Steel, UNS H94301 (Composition Spec) -:- 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 2869 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