AISI 4042H Steel Foil/Strip

AISI 4042H Steel Foil Product Information -:- For detailed product information, please contact sales. -: AISI 4042H Steel Foil Synonyms -:- For detailed product information, please contact sales. -:

AISI 4042H Steel Product Information -:- For detailed product information, please contact sales. -: ### **Product Introduction: AISI 4042H Alloy Steel (H-Steel)** **AISI 4042H** is a medium-carbon, chromium-molybdenum (Cr-Mo) alloy steel supplied with a **guaranteed hardenability band**. The **"H" suffix** is the defining characteristic, signifying that the chemical composition is controlled within narrower limits to ensure predictable and consistent depth of hardening (hardenability) after quenching, as per standard end-quench (Jominy) tests. This makes 4042H the preferred choice over standard 4042 for critical components where uniform mechanical properties throughout the cross-section are essential, especially in mass production. #### **1. Chemical Composition** The composition is similar to standard AISI 4042 but with a **broader, controlled range for key elements** to achieve the specified hardenability band. The ranges are designed to ensure consistent Jominy test results. | Element | Content Range (%) | Primary Function & H-Steel Consideration | | :--- | :--- | :--- | | **Carbon (C)** | 0.39 - 0.45 | Provides core strength and hardness. Range is controlled to balance hardenability and toughness. | | **Manganese (Mn)** | 0.65 - 0.95 | A major contributor to hardenability. Its range is carefully set to control the hardenability band width. | | **Phosphorus (P)** | ≤ 0.035 | Impurity (kept low). | | **Sulfur (S)** | ≤ 0.040 | Impurity. May be higher in 4042RH for improved machinability. | | **Silicon (Si)** | 0.15 - 0.35 | Deoxidizer and strengthens ferrite. | | **Chromium (Cr)** | 0.20 - 0.35 | Enhances hardenability and wear resistance. Its range is factored into the H-band calculation. | | **Molybdenum (Mo)** | 0.15 - 0.25 | Improves hardenability, strength at high temperatures, and reduces temper embrittlement. Critical for H-band control. | | **Boron (B)**| Optional (e.g., 94B30H) | Sometimes added in minute amounts (e.g., 0.0005-0.003%) to significantly boost hardenability at low cost, creating a different "H" grade. | *Note: The actual acceptable composition for a specific heat of 4042H is determined by the steel producer to hit the target hardenability band, not just the individual element ranges.* #### **2. Physical & Mechanical Properties** *General physical properties are identical to standard 4042.* The key difference lies in the **guaranteed and more consistent mechanical properties after heat treatment**, especially in larger sections. * **Density:** 7.85 g/cm³ * **Melting Point:** ~ 1427°C (2600°F) * **Modulus of Elasticity:** 190 - 210 GPa **Mechanical Properties (After Quenching & Tempering):** *Properties are highly dependent on section size and tempering temperature, but 4042H ensures less variation for a given size.* * **Tensile Strength:** 850 - 1100 MPa (typical range, adjustable via tempering) * **Yield Strength (0.2% Offset):** 650 - 900 MPa * **Elongation:** 15 - 20% * **Hardness:** Can be reliably achieved from 25 HRC to 50+ HRC based on heat treatment. * **Core Properties:** The main advantage is the **minimal difference between surface and core hardness/strength** in a specified section size, reducing the risk of soft centers. #### **3. Hardenability & Heat Treatment** * **Guaranteed Hardenability:** Supplied with a **Jominy Hardenability Band** (e.g., as per SAE J1268). Customers receive a hardenability curve chart showing the minimum and maximum hardness expected at each distance from the quenched end. This allows designers to predict performance in actual parts. * **Heat Treatment:** Processes (annealing, normalizing, quenching, tempering) are similar to standard 4042. However, the predictable response allows for **more reliable and repeatable heat-treating cycles in production**, reducing scrap rates. Quenching is typically in oil. #### **4. Product Applications** 4042H is specified where **consistent, predictable performance and uniform strength profile** are critical, often in safety-critical or highly stressed components. * **Automotive & Truck:** **High-stress gears** (transmission, differential), **drive shafts**, **axle shafts**, **crankshafts**, **kingpins**, and **steering components**. This is the primary application domain for H-steels. * **Heavy Equipment & Agriculture:** Gears, pinions, and shafts in tractors, earth-moving machinery, and harvesters. * **Power Transmission:** Critical gears and shafts in gearboxes and industrial drives. * **Forgings:** High-quality forged components requiring uniform properties throughout. #### **5. International Standards & Equivalent Grades** The "H" designation is recognized in several standards systems. | Standard | Designation | Note | | :--- | :--- | :--- | | **SAE / AISI (USA)** | **4042H** | The primary standard (SAE J1268) | | **ASTM (USA)** | A304 (Standard for H-Steel Bars) | Governs the requirements | | **UNS** | H40420 | | | **DIN (Germany)** | **42CrMo4+H** | The "+H" indicates hardenability testing | | **EN (European)** | **1.7225+H** | | | **JIS (Japan)** | SCM440H | | | **GB (China)** | 42CrMoH | | #### **6. Key Advantages over Standard 4042** * **Predictable Performance:** Guaranteed hardenability minimizes heat treatment guesswork. * **Uniform Properties:** Reduces the gradient between surface and core, leading to more reliable parts. * **Improved Consistency:** Less batch-to-batch variation in final mechanical properties. * **Design Optimization:** Allows engineers to design to precise strength levels, potentially enabling weight reduction. * **Manufacturing Efficiency:** Reduces heat treatment-related rejects and allows for more automated processing. **Conclusion:** **AISI 4042H** is the engineered, high-reliability version of 4042 steel. Its guaranteed hardenability makes it the material of choice for manufacturing critical, high-performance components where **consistency, reliability, and uniform strength are non-negotiable**, particularly in the automotive and heavy machinery industries. -:- For detailed product information, please contact sales. -: AISI 4042H Steel Specification Dimensions Size： Diameter 20-1000 mm Length <6190 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 4042H Steel Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4042H Steel Foil -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4042H Steel Foil -:- For detailed product information, please contact sales. -:

Packing of AISI 4042H Steel Foil/Strip -:- 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 Foil/Strip 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 2661 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