AISI 4130 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 4130 Steel Flange, Product Information -:- For detailed product information, please contact sales. -: AISI 4130 Steel Flange, Synonyms -:- For detailed product information, please contact sales. -:

AISI 4130 Steel, Product Information -:- For detailed product information, please contact sales. -: ### **Product Datasheet: AISI 4130 Alloy Steel (UNS G41300)** --- #### **1. Overview** AISI 4130 is a versatile, low-alloy chromium-molybdenum (Cr-Mo) steel renowned for its excellent combination of strength, toughness, weldability, and fatigue resistance. Its relatively low carbon content compared to higher-grade alloys like 4140 provides good formability and weldability while the chromium and molybdenum additions enhance hardenability, strength, and resistance to creep and impact. It is a workhorse material in industries where high strength-to-weight ratio and reliability under dynamic loads are critical. **Key Characteristics:** * High Strength-to-Weight Ratio * Good Toughness and Impact Resistance * Excellent Weldability (with proper procedure) * Good Machinability (in annealed condition) * Responsive to Heat Treatment --- #### **2. International Standard Designations** | Standard System | Designation | | :--- | :--- | | **UNS** | G41300 | | **AISI / SAE** | 4130 | | **ASTM** | A29 (Bar), A519 (Seamless Tube) | | **Aerospace (AMS)** | AMS 6350 (Sheet/Strip), AMS 6370 (Bars) | | **Europe (EN)** | 1.7218 | 25CrMo4 | | **Germany (DIN)** | 1.7218 | 25CrMo4 | | **Japan (JIS)** | SCM430 | | **ISO** | 25CrMo4 | --- #### **3. Chemical Composition (Weight %)** | Element | Min (%) | Max (%) | Typical (%) | | :--- | :--- | :--- | :--- | | **Carbon (C)** | 0.28 | 0.33 | 0.30 | | **Manganese (Mn)** | 0.40 | 0.60 | 0.50 | | **Silicon (Si)** | 0.15 | 0.35 | 0.25 | | **Chromium (Cr)** | 0.80 | 1.10 | 0.95 | | **Molybdenum (Mo)** | 0.15 | 0.25 | 0.20 | | **Phosphorus (P)** | - | 0.035 | 0.020 | | **Sulfur (S)** | - | 0.040 | 0.025 | | **Iron (Fe)** | Balance | | | --- #### **4. Physical Properties** | Property | Metric | Imperial | | :--- | :--- | :--- | | **Density** | 7.85 g/cm³ | 0.284 lb/in³ | | **Melting Point** | ~1427-1510 °C | ~2600-2750 °F | | **Modulus of Elasticity** | 205 GPa | 29.7 x 10⁶ psi | | **Poisson's Ratio** | 0.29 | 0.29 | | **Thermal Conductivity** | 42.7 W/m·K @ 100°C | 247 BTU·in/hr·ft²·°F | | **Coefficient of Thermal Expansion** | 12.3 µm/m·°C (20-100°C) | 6.8 µin/in·°F | --- #### **5. Mechanical Properties** *Properties are highly dependent on heat treatment and section size.* **A. Normalized & Tempered Condition (Typical for many structural applications)** * **Tensile Strength:** 670 MPa (min) | 97,000 psi (min) * **Yield Strength (0.2% Offset):** 435 MPa (min) | 63,000 psi (min) * **Elongation (% in 50mm):** 25.5% (min) * **Reduction of Area:** 50% (min) * **Hardness:** 197-229 HB **B. Quenched & Tempered Condition (Higher Strength)** * **Tensile Strength:** 930 - 1080 MPa | 135,000 - 157,000 psi * **Yield Strength:** 760 MPa (min) | 110,000 psi (min) * **Elongation:** 18% (min) * **Hardness:** 28 - 32 HRC (Varies with tempering temperature) * **Impact Toughness (Charpy V-notch):** >54 J @ RT | >40 ft-lb @ RT **Hardenability (Jominy Test Band):** Available per SAE J1268 standards. Good through-hardening in sections up to ~75mm (3 inches) diameter when oil quenched. --- #### **6. Heat Treatment** * **Annealing:** Heat to 843-871°C (1550-1600°F), slow furnace cool. Hardness: ~180 HB. * **Normalizing:** Heat to 899-927°C (1650-1700°F), air cool. * **Quenching:** Austenitize at 871-899°C (1600-1650°F), **oil quench**. * **Tempering:** Temper immediately after quenching. * **For High Toughness:** 540-650°C (1000-1200°F) * **For High Strength:** 205-425°C (400-800°F) * **Note:** Rapid cooling (water or oil) from tempering temperatures above 375°C (700°F) is recommended to avoid temper embrittlement. --- #### **7. Product Forms & Key Applications** AISI 4130 is available in a wide range of forms to suit manufacturing needs. | Product Form | Typical Applications | | :--- | :--- | | **Seamless Tubing** | **Aerospace:** Aircraft engine mounts, landing gear components, hydraulic lines. **Automotive:** Roll cages, chassis tubing, drive shafts. **Industrial:** Hydraulic cylinders, high-pressure systems. | | **Round & Flat Bars** | **General Engineering:** Shafts, gears, bolts, studs, connecting rods, machinery components. **Oil & Gas:** Tool joints, valve parts. | | **Sheets & Plates** | **Aerospace:** Structural airframe components, brackets. **Defense:** Armor plating (in processed forms). | | **Forgings** | High-stress components requiring grain flow integrity (e.g., crankshafts, yoke arms). | | **Wire** | Springs, fasteners, welding wire. | --- #### **8. Fabrication & Welding** * **Machinability:** Good in annealed or normalized condition (~65% of 1212 steel). Hardness should ideally be below 280 HB for optimal machining. * **Weldability:** **Excellent for a low-alloy steel.** Requires preheating (150-260°C / 300-500°F) for thicker sections and post-weld heat treatment (PWHT) to restore toughness in the heat-affected zone (HAZ). * **Common Methods:** GTAW (TIG), GMAW (MIG), SMAW (Stick). Use compatible low-alloy filler metals (e.g., ER80S-D2, E9018-D2). * **Formability:** Good in annealed condition. Can be cold formed with appropriate tooling. --- #### **9. Why Choose AISI 4130?** * **Proven Performance:** A well-understood and reliable material with decades of service history. * **Versatility:** Can be tailored from a tough, weldable state to a high-strength state via heat treatment. * **Favorable Cost/Performance Ratio:** Offers properties superior to plain carbon steels at a reasonable cost premium. * **Wide Availability:** Readily available in numerous forms and sizes from global suppliers. **Disclaimer:** This datasheet provides typical information. For critical applications, always consult the relevant material standard, qualified engineers, and perform appropriate testing. Mechanical properties are influenced by processing history, section size, and heat treatment practices. -:- For detailed product information, please contact sales. -: AISI 4130 Steel, Specification Dimensions Size： Diameter 20-1000 mm Length <4033 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 4130 Steel, Properties -:- For detailed product information, please contact sales. -:

Applications of AISI 4130 Steel Flange, -:- For detailed product information, please contact sales. -: Chemical Identifiers AISI 4130 Steel Flange, -:- For detailed product information, please contact sales. -:

Packing of AISI 4130 Steel Flange, -:- 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 504 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