AISI 1340H Steel, annealed

AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 1340H Steel, Annealed** **Product Description:** This is a high-quality, medium-carbon, hardenable alloy steel supplied in the annealed condition. The specific heat treatment protocol—annealing at 800°C followed by a very slow furnace cool (11°C/hour) to 600°C, then air cooling—is designed to produce an ideal microstructure for subsequent machining and final heat treatment. This process maximizes softness and ductility, minimizes residual stresses, and ensures a consistent, uniform microstructure throughout the 25 mm (1 inch) diameter round bar, optimizing it for demanding applications. **Key Features:** * **Excellent Machinability:** The full annealed condition provides superior chip formation and extended tool life. * **Uniform Hardness & Structure:** Guaranteed homogeneity across the entire cross-section of the bar. * **Predictable Hardenability:** The "H" designation ensures consistent response to quenching and tempering within specified hardenability bands. * **Good Strength & Toughness Balance:** Serves as an optimal starting condition for components requiring high strength after heat treatment. --- ### **1. Chemical Composition** The composition adheres to standard AISI 1340H limits, which are broader than standard 1340 to guarantee hardenability. | Element | Composition Range (%) | | :--- | :--- | | **Carbon (C)** | 0.37 - 0.44 | | **Manganese (Mn)** | 1.35 - 1.65 | | **Phosphorus (P)** | ≤ 0.035 | | **Sulfur (S)** | ≤ 0.040 | | **Silicon (Si)** | 0.15 - 0.35 | | **Iron (Fe)** | Balance | *Note: The "H" grade includes controlled ranges for elements like Manganese to ensure consistent hardenability.* --- ### **2. Physical & Mechanical Properties (Annealed Condition)** * **Typical Hardness:** **HB 183 - 217** (Approx. HRB 88 - 95) * **Tensile Strength:** ~ 580 - 655 MPa (84 - 95 ksi) * **Yield Strength (0.2% Offset):** ~ 340 - 415 MPa (49 - 60 ksi) * **Elongation (in 50 mm):** ~ 22% - 28% * **Reduction of Area:** ~ 45% - 55% * **Machinability (Compared to 1% C steel):** ~ 65% **Microstructure:** Fine lamellar pearlite with ferrite, characteristic of a full anneal. --- ### **3. Product Specification & International Standards** * **Product Form:** Hot-rolled round bar, 25 mm diameter (1 inch). * **Condition:** Annealed as per specified cycle (800°C → FC at 11°C/hr to 600°C → AC). * **Applicable International Standards:** * **AISI / SAE:** AISI 1340H, SAE J1268 (Hardenability Bands) * **ASTM:** ASTM A304 (Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements) * **UNS:** G13400 * **European (Similar):** 1.5534 (34Cr4H) * **Japanese (Similar):** SCr440H --- ### **4. Typical Applications** This annealed 1340H bar is the preferred raw material for components that require extensive machining before being hardened and tempered to high strength. Common end-uses include: * **Automotive:** Gears, shafts, axles, spindles, and high-strength fasteners. * **Industrial Machinery:** Critical pins, connecting rods, hydraulic piston rods, and machine tool components. * **Agricultural Equipment:** Gears, drive shafts, and high-wear parts. * **General Engineering:** Any component requiring a good balance of machinability in the "soft" state and high strength/toughness in the final hardened state. --- ### **5. Subsequent Heat Treatment Recommendation** * **Forging:** Heat to 1150-1200°C (2100-2200°F). Do not forge below 850°C (1550°F). Anneal after forging to relieve stresses. * **Hardening:** Austenitize at 830-850°C (1525-1560°F), quench in oil. * **Tempering:** Temper immediately after quenching at the temperature required to achieve the desired final hardness and strength (typically 150-650°C / 300-1200°F). * **Surface Hardening:** Well-suited for processes like induction or flame hardening due to its controlled carbon content and hardenability. **Disclaimer:** The values provided are typical. For critical applications, specific testing and validation against project requirements are essential. -:- For detailed product information, please contact sales. -: AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <6168 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 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 1340H Steel, annealed at 800°C, furnace cooled 11°C/hour to 600°C, air cooled, 25 mm (1 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 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 2639 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