AISI E4340 H Steel Flange,

1,We Manufacturing processes are primarily classified into four types: 1:Forging, 2:Casting, 3:Cutting, 4:Rolling. 2,We can manufacture in accordance with these standards. Standards: GB Series (Chinese Standards), JB Series (Machinery Standards), HG Series (Chemical Industry Standards), ASME B16.5 (American Standards), BS4504 (British Standards), DIN (German Standards), and JIS (Japanese Standards). Internationally, there are two primary systems of pipe flange standards: the European system, represented by the German DIN standards (including those of the former Soviet Union), and the American system, represented by the US ANSI pipe flange standards. Other common standards include: the Chinese Ministry of Machinery Industry standards (JB series), the Ministry of Chemical Industry standards (HG series), the Chinese National Standard *GB/T 9112–9124-2010 Steel Pipe Flanges*, as well as US standards (ASME B16.5), British standards (BS4504), German standards (DIN), Japanese standards (JIS), and marine standards (CBM), among others. The nominal pressure ratings for the PN series are designated by "PN" and comprise the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160. The nominal pressure ratings for the Class series are designated by "Class" and comprise the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500. Flange Classification 1. **According to Chemical Industry Standards:** Flanges are classified as follows: Plate Flat Welding Flange (PL), Necked Flat Welding Flange (SO), Necked Butt Welding Flange (WN), Integral Flange (IF), Socket Welding Flange (SW), Threaded Flange (Th), Butt Welding Ring Loose Flange (PJ/SE), Blind Flange (BL), Flat Welding Ring Loose Flange (PJ/PJ), and Lined Blind Flange (BL(s)). 2. **According to Petrochemical (SH) Industry Standards:** Flanges are classified as follows: Threaded Flange (PL), Butt Welding Flange (WN), Flat Welding Flange (SO), Socket Welding Flange (SW), Loose Flange (LJ), and Blind Flange (no specific designation). 3. **According to Machinery (JB) Industry Standards:** Flanges are classified as follows: Integral Flange, Butt Welding Flange, Plate Flat Welding Flange, Butt Welding Ring Plate Loose Flange, Flat Welding Ring Plate Loose Flange, Lap Joint Ring Plate Loose Flange, and Blind Flange. 4. **According to Connection Method/Type:** Flanges are classified as follows: Plate Flat Welding Flange, Necked Flat Welding Flange, Necked Butt Welding Flange, Socket Welding Flange, Threaded Flange, Blind Flange, Necked Butt Welding Ring Loose Flange, Flat Welding Ring Loose Flange, Ring-Type Joint (RTJ) Flange and Blind Flange, Large-Diameter Plate Flange, Large-Diameter High-Neck Flange, Figure-8 Blind Plate, Butt Welding Ring Loose Flange, etc. 5. **According to the Component Being Connected:** Flanges can be classified into Vessel Flanges and Pipe Flanges. 6. **According to Structural Type:** Flanges include Integral Flanges, Threaded Flanges, Flat Welding Flanges, Butt Welding Flanges, Lap Joint (Loose/Swivel) Flanges, and Blind Flanges. A flange—also referred to as a flange plate or rim—is a component used to connect shafts to one another, or, more commonly, to join the ends of pipes. Flanges are also utilized at the inlet and outlet ports of equipment to facilitate connections between two devices—for instance, the flange on a speed reducer. A "flange connection" or "flanged joint" refers to a detachable joint assembly comprising three interconnected elements—a flange, a gasket, and bolts—that together form a sealed structural unit. In the context of piping systems, a "pipe flange" specifically denotes a flange used for plumbing within the installation; when applied to equipment, it refers to the inlet or outlet flange of that specific device. Flanges feature a series of holes through which bolts are inserted to securely fasten the two flanges together, while a gasket placed between the flanges ensures a leak-proof seal. Flanges are broadly categorized into three types: threaded (screw-in) flanges, welded flanges, and clamp-type flanges. Flanges are invariably used in pairs; threaded flanges are suitable for low-pressure piping applications, whereas welded flanges are required for systems operating at pressures exceeding 4 kilograms per square centimeter. A sealing gasket is inserted between the two flange plates, which are then firmly secured using bolts. The thickness of a flange—as well as the specifications of the bolts used to fasten it—vary depending on the specific pressure rating required for the application. When connecting equipment such as water pumps or valves to piping systems, the corresponding connection points on these devices are often manufactured in the shape of a matching flange; this method of attachment is also referred to as a "flange connection." Generally, any connecting component that utilizes bolts to join and seal the perimeters of two flat surfaces—such as the joints in ventilation ducts—is termed a "flange"; such components may collectively be classified as "flange-type parts." However, since such a connection often constitutes merely a *portion* of a larger device—for instance, the interface between a flange and a water pump—it would be inappropriate to classify the entire water pump itself as a "flange-type part." Conversely, smaller components—such as valves—that feature such flanged interfaces may indeed be appropriately categorized as "flange-type parts." -:- For detailed product information, please contact sales. -: AISI E4340 H Steel Flange, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: AISI E4340 H Steel Flange, annealed, 25 mm round Synonyms -:- For detailed product information, please contact sales. -:

AISI E4340 H Steel, annealed, 25 mm round Product Information -:- For detailed product information, please contact sales. -: # **AISI E4340H Alloy Steel Round Bar (Annealed Condition)** ## **Guaranteed Hardenability Steel - 25mm Diameter** --- ### **1. PRODUCT OVERVIEW** **AISI E4340H Steel, Annealed Condition** - **Product Form:** 25mm (1 inch) diameter round bar - **Condition:** Annealed for optimal machinability - **Special Feature:** "H" designation indicates controlled hardenability range - **Key Advantage:** Predictable heat treatment response for consistent through-hardening **Critical Distinction: E4340 vs E4340H** - **Standard E4340:** Standard composition ranges - **E4340H:** Composition controlled to ensure specific hardenability bands as per ASTM A304 - **Guarantee:** Jominy end-quench test results within specified bands - **Benefit:** Reduced variation in heat treatment results across different production batches --- ### **2. CHEMICAL COMPOSITION (H-STEEL RANGES)** | Element | Standard 4340 Range (%) | E4340H Controlled Range (%) | Primary Function | |---------|-------------------------|-----------------------------|------------------| | **Carbon (C)** | 0.38-0.43 | 0.37-0.44 | Base hardenability & strength | | **Manganese (Mn)** | 0.60-0.80 | 0.65-0.85 | Hardenability control element | | **Silicon (Si)** | 0.15-0.30 | 0.15-0.35 | Deoxidizer, strength | | **Nickel (Ni)** | 1.65-2.00 | 1.55-2.00 | Toughness, hardenability | | **Chromium (Cr)** | 0.70-0.90 | 0.65-0.95 | Hardenability, wear resistance | | **Molybdenum (Mo)** | 0.20-0.30 | 0.20-0.30 | Grain refinement, strength | | **Phosphorus (P)** | ≤0.035 | ≤0.025 | Tighter impurity control | | **Sulfur (S)** | ≤0.040 | ≤0.025 | Tighter impurity control | | **Boron (B)** | - | Optional: 0.0005-0.003 | Hardenability enhancer | **Note:** E4340H chemistry is adjusted lot-to-lot to hit precise hardenability bands rather than fixed composition ranges. --- ### **3. MATERIAL SPECIFICATIONS & STANDARDS** | Standard | Number | Title | Relevance to E4340H | |----------|--------|-------|---------------------| | **ASTM** | A304 | Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements | **Primary H-steel standard** | | **ASTM** | A29/A29M | Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished | General bar requirements | | **SAE** | J1268 | Hardenability Bands for Hardenability Steels | H-band specifications | | **AMS** | 6414H | Steel Bars, Forging, and Tubing 1.65Ni-0.80Cr-0.35Mo (0.38-0.43C) | Aerospace H-version | | **ISO** | 683-11 | Heat-treatable steels, alloy steels and free-cutting steels - Part 11: Hardenability steels | International equivalent | | **DIN** | 1.6565H | 34CrNiMo6 H-version | European equivalent | --- ### **4. HARDENABILITY DATA (JOMINY TEST)** **Guaranteed Hardenability Bands for 25mm Section:** | Distance from Quenched End | Hardness Range (HRC) | Corresponding Microstructure | |----------------------------|----------------------|------------------------------| | 1.5 mm (1/16 inch) | 50-57 HRC | 90-100% Martensite | | 5 mm (3/16 inch) | 47-54 HRC | 80-90% Martensite | | 10 mm (3/8 inch) | 40-48 HRC | 50-70% Martensite | | 15 mm (5/8 inch) | 35-42 HRC | 30-50% Martensite | | 20 mm (3/4 inch) | 30-38 HRC | Pearlite/Bainite formation | **Center of 25mm Bar Prediction:** - **Oil Quench:** 35-42 HRC at center - **Water Quench:** 40-48 HRC at center - **Assurance:** Consistent through-hardening across full diameter --- ### **5. MECHANICAL PROPERTIES (ANNEALED CONDITION)** | Property | Typical Value | Testing Standard | Notes | |----------|---------------|------------------|-------| | **Hardness** | 197-241 HB (93-100 HRB) | ASTM E10 | Optimized for machining | | **Tensile Strength** | 620-750 MPa | ASTM E8/E8M | As-annealed | | **Yield Strength** | 380-480 MPa | ASTM E8/E8M | As-annealed | | **Elongation** | 20-25% | ASTM E8/E8M | In 50mm gauge length | | **Reduction of Area** | 45-55% | ASTM E8/E8M | Good ductility | | **Machinability Rating** | 60% (of B1112 steel) | - | Favorable for turning/ milling | **Annealing Microstructure:** - **Structure:** Spheroidized carbide in ferrite matrix - **Grain Size:** ASTM 5-7 - **Uniformity:** Consistent throughout cross-section --- ### **6. PHYSICAL PROPERTIES** | Property | Value | Conditions | |----------|-------|------------| | Density | 7.85 g/cm³ | At 20°C | | Melting Point | 1420-1460°C | Approximate range | | Thermal Conductivity | 42.0 W/m·K | Annealed, at 100°C | | Specific Heat Capacity | 460 J/kg·K | At 20°C | | Electrical Resistivity | 0.24 µΩ·m | At 20°C | | Modulus of Elasticity | 205 GPa | - | | Poisson's Ratio | 0.29 | - | --- ### **7. TYPICAL APPLICATIONS** #### **Automotive & Truck Components** - **Gears & Pinions:** Transmission gears, differential pinions - **Axles & Shafts:** Truck axles, power take-off shafts - **Crankshafts:** High-performance engine crankshafts - **Critical Bolts:** Engine head bolts, connecting rod bolts #### **Aerospace Components** - **Landing Gear Parts:** Forgings for machining - **Engine Mounts:** Structural components - **Actuator Components:** High-strength moving parts #### **Industrial Equipment** - **Large Gears:** Industrial gearbox components - **Heavy Machinery:** Excavator pins, bearing races - **Oilfield Tools:** Drill string components, tool joints #### **Why E4340H vs Standard E4340 for These Applications:** 1. **Consistent Heat Treatment:** Less distortion, uniform hardness 2. **Reduced Scrap Rate:** Predictable hardening response 3. **Better Fatigue Performance:** Uniform microstructure 4. **Interchangeability:** Components from different batches behave identically --- ### **8. HEAT TREATMENT GUIDELINES** #### **Recommended Heat Treatment for 25mm Bars:** | Process | Temperature | Medium | Holding Time* | |---------|-------------|---------|---------------| | **Annealing** | 830-850°C | Furnace cool | 1.5-2 hours | | **Normalizing** | 870-890°C | Air cool | 30-45 min | | **Hardening** | 830-850°C | Oil quench | 45-60 min | | **Tempering** | 200-650°C | Air cool | 1-2 hours | *Holding times based on 25mm diameter; adjust for actual furnace loads. #### **Expected Properties After Heat Treatment (Example):** - **Oil Quench + 540°C Temper:** 1100-1200 MPa UTS, 35-40 HRC - **Water Quench + 200°C Temper:** 1800-2000 MPa UTS, 48-52 HRC --- ### **9. PROCESSING CHARACTERISTICS** #### **Machinability (Annealed Condition):** - **Relative Rating:** Good (60% of B1112 standard) - **Recommended Speed:** 30-45 m/min for turning - **Feed Rate:** 0.15-0.30 mm/rev - **Tool Material:** Coated carbide or high-speed steel - **Chip Formation:** Continuous chips with proper tool geometry #### **Forging:** - **Temperature Range:** 1150-900°C - **Finishing Temperature:** ≥850°C - **Post-Forging:** Must be annealed or normalized #### **Weldability:** - **Rating:** Poor (requires precautions) - **Preheat:** 200-300°C minimum - **Method:** Low-hydrogen processes (SMAW, GTAW) - **Post-Weld:** Full heat treatment recommended --- ### **10. QUALITY ASSURANCE** #### **Mandatory Testing for E4340H:** 1. **Chemical Analysis:** Spectroscopic verification 2. **Hardenability Test:** Jominy end-quench per ASTM A255 3. **Hardness Verification:** Multiple points on bar surface 4. **Macroetch Test:** Check for segregation, piping #### **Certification Provided:** - Material Test Certificate 3.1 per EN 10204 - Hardenability curve with actual test results - Chemical analysis report - Heat treatment recommendations --- ### **11. PACKAGING & IDENTIFICATION** #### **Standard Packaging:** - **Bundle Weight:** 1-3 metric tons - **Protection:** Rust preventive coating or VCI paper - **Marking:** Heat number, grade (E4340H), size, supplier ID - **End Tags:** Color-coded for grade identification #### **Traceability:** - Complete mill history including: - Heat/melt number - Forging/piercing details (if applicable) - Heat treatment records - Test reports with unique identification --- ### **12. TECHNICAL ADVANTAGES SUMMARY** **For Design Engineers:** - Predictable hardening depth in 25mm sections - Consistent mechanical properties after heat treatment - Reduced risk of soft spots or excessive distortion **For Manufacturers:** - Lower rejection rates in heat treatment - Reduced machining time due to consistent hardness - Better tool life predictability - Suitable for automated production lines **For Quality Assurance:** - Documented hardenability curves - Tight compositional control - Full traceability from melt to final bar --- **COMPLIANCE STATEMENT:** This AISI E4340H steel is produced in compliance with ASTM A304 requirements for hardenability steels. The guaranteed hardenability bands ensure consistent performance in heat treatment, making it particularly suitable for safety-critical components where predictable mechanical properties are essential. For specific application requirements, consult with our technical service team for customized recommendations. **Note:** All values are typical for properly processed material. Actual results may vary within specified ranges. For critical applications, testing of actual production material is recommended. -:- For detailed product information, please contact sales. -: AISI E4340 H Steel, annealed, 25 mm round Specification Dimensions Size： Diameter 20-1000 mm Length <4068 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 E4340 H Steel, annealed, 25 mm round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI E4340 H Steel Flange, annealed, 25 mm round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI E4340 H Steel Flange, annealed, 25 mm round -:- For detailed product information, please contact sales. -:

Packing of AISI E4340 H Steel Flange, annealed, 25 mm 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 Flange 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 539 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