AISI 4130H 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 4130H Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: AISI 4130H Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Synonyms -:- For detailed product information, please contact sales. -:

AISI 4130H Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Product Information -:- For detailed product information, please contact sales. -: # **AISI 4130H Steel, Normalized Condition Product Specification** ## **1. Product Definition & Processing History** This specification covers **AISI 4130H** alloy steel supplied in the form of **13 mm (0.5 inch) diameter round bars**, processed to the following condition: * **Heat Treatment:** Normalized * **Normalizing Temperature:** 870°C (1600°F) * **Cooling Method:** Air-cooled in still air * **Product Form:** Hot-rolled or cold-drawn round bar * **Condition:** As-normalized, un-tempered This normalized condition provides a uniform, fine-grained microstructure that optimizes machinability and serves as an ideal preparation for subsequent heat treatment or cold forming operations. ## **2. International Standards & Designations** * **Primary Standard:** ASTM A304 (Standard Specification for Carbon and Alloy Steel Bars Subject to End-Quench Hardenability Requirements) * **Material Designation:** AISI 4130H (H-indicates controlled hardenability) * **UNS Designation:** H41300 * **European Equivalent:** 1.7227H (34CrMo4H) per EN 10083-3 * **Japanese Equivalent:** SCM430H per JIS G4052 * **ISO Equivalent:** 34CrMo4 (ISO 683-18) with H-band requirements * **Processing Standard:** Normalizing per ASTM A29/A29M ## **3. Chemical Composition (Weight %)** Chemical composition is controlled to meet hardenability requirements (H-band) rather than strict percentage limits: | Element | Composition Range (%) | Typical Aim (%) | Function in 4130H | |---------|---------------------|----------------|-------------------| | **Carbon (C)** | 0.28 - 0.33 | 0.30 | Primary strengthener, provides hardenability | | **Manganese (Mn)** | 0.40 - 0.60 | 0.50 | Increases hardenability and strength | | **Phosphorus (P)** | ≤ 0.035 | 0.020 | Residual element (controlled) | | **Sulfur (S)** | ≤ 0.040 | 0.025 | Improves machinability (controlled) | | **Silicon (Si)** | 0.15 - 0.35 | 0.25 | Deoxidizer, strengthens ferrite | | **Chromium (Cr)** | 0.80 - 1.10 | 0.95 | Enhances hardenability and corrosion resistance | | **Molybdenum (Mo)** | 0.15 - 0.25 | 0.20 | Increases hardenability, reduces temper embrittlement | | **Boron (B)** *optional* | 0.0005 - 0.003 | - | Significantly increases hardenability when added | **Note:** The "H" designation means chemistry may vary within limits to achieve specified hardenability bands. Carbon is typically controlled to the lower end (0.28-0.30%) for this diameter. ## **4. Hardenability Characteristics** * **Jominy Hardenability Band:** Complies with ASTM A304 specified bands (typically Band 1 or 2) * **Ideal Critical Diameter (Dᵢ):** ~2.0-2.5 inches (51-64 mm) for oil quenching * **Hardenability at 13 mm diameter:** Through-hardening achievable with proper quench ## **5. Physical Properties (Normalized Condition)** * **Density:** 7.85 g/cm³ (0.284 lb/in³) * **Melting Range:** 1425-1520°C (2600-2770°F) * **Modulus of Elasticity:** 205 GPa (29.7 × 10⁶ psi) * **Shear Modulus:** 80 GPa (11.6 × 10⁶ psi) * **Poisson's Ratio:** 0.29 * **Thermal Conductivity:** 42.6 W/m·K at 100°C * **Specific Heat Capacity:** 473 J/kg·K at 20°C * **Coefficient of Thermal Expansion:** 11.7 µm/m·°C (20-100°C) ## **6. Mechanical Properties (Normalized at 870°C, Air-Cooled)** *These properties are guaranteed minimums for 13 mm (0.5 in.) diameter:* | Property | Value | Test Standard | |----------|-------|--------------| | **Tensile Strength** | 655 MPa (95 ksi) min | ASTM A370 | | **Yield Strength (0.2% offset)** | 415 MPa (60 ksi) min | ASTM A370 | | **Elongation in 50 mm (2 in.)** | 25% min | ASTM A370 | | **Reduction of Area** | 50% min | ASTM A370 | | **Hardness (Brinell)** | 197-229 HB | ASTM E10 | | **Hardness (Rockwell)** | 93-100 HRB | ASTM E18 | | **Impact Energy (Charpy V-notch)** | 54 J (40 ft-lb) min at 20°C | ASTM A370 | ## **7. Metallurgical Characteristics** * **Microstructure:** Fine pearlite and ferrite (normalized structure) * **Grain Size:** ASTM 5-8 (fine grain practice) * **Prior Austenite Grain Size:** ASTM 5 or finer * **Decarburization:** ≤ 0.25 mm (0.010 in.) total depth on diameter * **Surface Quality:** Free from seams, cracks, and other injurious defects ## **8. Manufacturing & Processing Characteristics** ### **Machinability** * **Relative Machinability:** 65% (compared to 100% for B1112 steel) * **Recommended Cutting Speeds:** 30-45 m/min (100-150 ft/min) for turning * **Tool Material:** Carbide or high-speed steel with positive rake angles * **Coolant:** Recommended for optimal tool life and surface finish ### **Further Processing Compatibility** * **Subsequent Heat Treatment:** Ideal condition for quenching and tempering * **Weldability:** Good with proper precautions * **Forgability:** Excellent in this condition * **Cold Forming:** Good for moderate deformation ## **9. Product Applications** This normalized 4130H product is particularly suitable for: ### **Aerospace Components** * Aircraft engine mounts and fittings * Landing gear components (prior to final heat treatment) * Structural brackets and fittings * Missile and rocket components ### **Automotive & Racing** * Roll cage tubing (before final heat treatment) * Chassis components * Suspension parts * Drive train components ### **Oil & Gas Industry** * Downhole tool components * Valve parts * Wellhead equipment ### **General Engineering** * Shafts and axles * Gears and sprockets * High-strength fasteners * Hydraulic cylinder components ## **10. Advantages of This Specific Product Form** 1. **Consistent Properties:** Normalizing ensures uniform microstructure throughout 13 mm cross-section 2. **Predictable Machining:** Uniform hardness provides consistent tool wear and dimensional control 3. **Ideal for Further Processing:** Optimal condition for subsequent heat treatment or cold working 4. **Cost-Effective:** Eliminates need for customer normalization 5. **Ready-to-Use:** Requires no additional thermal processing for many applications 6. **Hardenability Guarantee:** "H" designation ensures consistent response to final heat treatment ## **11. Quality Assurance** * **Mill Certification:** Provided with each shipment including chemical analysis, mechanical properties, and hardenability data * **Traceability:** Heat/lot traceability maintained * **Surface Inspection:** Visually inspected per ASTM A29 requirements * **Dimensional Tolerance:** ±0.4 mm (±0.015 in.) on 13 mm diameter * **Straightness:** ≤ 1.5 mm/m (≤ 0.018 in./ft) ## **12. Storage & Handling** * **Storage Conditions:** Dry, indoor environment to prevent corrosion * **Surface Protection:** Light oil coating for corrosion protection * **Handling:** Standard material handling practices apply * **Shelf Life:** Indefinite when properly stored ## **13. Safety & Environmental** * **Machining:** Use appropriate PPE and ventilation for metal dust * **Disposal:** Recyclable as ferrous scrap * **Compliance:** Meets RoHS and REACH requirements --- **Technical Notes:** 1. The normalized condition provides an ideal balance of strength and ductility for machining operations 2. For applications requiring higher strength, this material can be quenched and tempered to achieve 850-1100 MPa tensile strength 3. The 13 mm diameter ensures rapid, uniform cooling during normalization 4. "H" designation guarantees consistent hardenability across different production lots **Disclaimer:** This specification is for informational purposes. Final material selection should be based on specific application requirements and consultation with qualified engineering personnel. Properties may vary slightly based on manufacturing process and testing methods. -:- For detailed product information, please contact sales. -: AISI 4130H Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Specification Dimensions Size： Diameter 20-1000 mm Length <4039 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 4130H Steel, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4130H Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4130H Steel Flange, normalized at 870°C (1600°F), air cooled, 13 mm (0.5 in.) round -:- For detailed product information, please contact sales. -:

Packing of AISI 4130H Steel Flange, normalized at 870°C (1600°F), air cooled, 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 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 510 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