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."
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AISI 9255 Steel Flange, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Product Information
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AISI 9255 Steel Flange, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Synonyms
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AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Product Information
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**Product Introduction: AISI 9255 Steel, Oil Quenched & Tempered**
**1. Product Overview**
AISI 9255 is a high-silicon, high-carbon spring steel engineered for supreme performance in demanding applications. This product is supplied in a **fully heat-treated condition**: oil quenched from 885°C (1625°F) and tempered at 540°C (1000°F). This specific thermal processing regimen unlocks the material's ultimate potential, yielding an exceptional combination of very high strength, excellent toughness, and outstanding fatigue resistance. It is a ready-to-use solution for critical components where maximum resilience under cyclic loading is required.
**2. International Standards & Designations**
This high-performance grade is recognized under key international standards:
* **AISI (USA):** 9255
* **ASTM (USA):** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought)
* **SAE (USA):** J403, J412 (Chemical Composition)
* **UNS:** G92550
* **EN (Europe):** 55Si7 (1.0909) - The closest comparable grade.
* **JIS (Japan):** SUP7 - A similar silicon-manganese spring steel.
**3. Chemical Composition (Typical % by Weight)**
The carefully balanced chemistry is the foundation of its superior properties.
* **Carbon (C):** 0.50 - 0.60
* **Manganese (Mn):** 0.70 - 0.95
* **Silicon (Si):** 1.80 - 2.20 *(Key element: provides solid solution strengthening, high hardenability, and resistance to temper softening)*
* **Phosphorus (P):** ≤ 0.035
* **Sulfur (S):** ≤ 0.040
* **Iron (Fe):** Balance
**4. Physical & Mechanical Properties (Quenched & Tempered Condition)**
The **885°C Quench + 540°C Temper** treatment produces a tempered martensite microstructure, optimized for high-strength spring applications.
* **Condition:** Oil Quenched (885°C / 1625°F) and Tempered (540°C / 1000°F)
* **Hardness:** 40 - 46 HRC (Typical aim ~43 HRC)
* **Tensile Strength:** 1550 - 1725 MPa (225 - 250 ksi)
* **Yield Strength (0.2% Offset):** ~1380 MPa (200 ksi)
* **Elongation (in 50 mm):** ~10%
* **Reduction of Area:** ~35%
* **Modulus of Elasticity:** ~205 GPa (30 x 10⁶ psi)
* **Fatigue Strength (Rotating Beam, polished):** Very High (> ~620 MPa / 90 ksi)
* **Density:** 7.85 g/cm³
**5. Key Product Features & Benefits**
* **Exceptional Fatigue Life:** The primary benefit, ideal for components undergoing millions of stress cycles.
* **High Strength-to-Weight Ratio:** Provides significant load capacity in a compact design.
* **Excellent Elastic Limit & Resilience:** Can absorb and return substantial energy without permanent deformation.
* **Good Toughness at High Strength:** The 540°C temper provides an optimal balance, preventing brittle failure.
* **Resistance to Tempering (due to Si):** The high silicon content allows tempering at this relatively high temperature (540°C) while retaining high hardness, which also provides good stress-relief and dimensional stability.
**6. Primary Applications**
This material is specified for the most critical, high-stress dynamic applications:
* **Heavy-Duty Coil Springs:** For high-performance automotive racing suspensions, heavy truck suspensions, and industrial shock absorbers.
* **Critical Leaf Springs:** Especially for commercial vehicles and railway freight cars.
* **High-Load Torsion Bars and Stabilizer Bars.**
* **Aerospace Grade Springs:** Including landing gear components and control system springs.
* **High-Pressure Valve Springs** in demanding internal combustion engines.
* **Industrial Disc Springs (Belleville Washers)** for high-force, limited-deflection applications.
**7. Processing Considerations**
* **Final State:** This product is supplied in a **ready-to-install** condition. No further heat treatment is required or recommended.
* **Machining & Grinding:** Machining is difficult and should be minimized. Any required finishing (e.g., grinding) must be done with light passes and ample coolant to prevent localized overheating and loss of temper.
* **Forming:** No cold forming is possible in this hardened state.
* **Welding:** **Strongly Discouraged.** The high carbon equivalent makes it extremely prone to cracking. If repair is absolutely necessary, it requires specialized procedures including full pre-heat, post-heat (tempering), and use of matching high-strength filler metals.
**Conclusion**
AISI 9255 steel in the oil-quenched and tempered condition (885°C / 540°C) represents the pinnacle of spring steel performance. It delivers an unparalleled combination of ultra-high strength, formidable toughness, and legendary fatigue resistance, making it the material of choice for engineers designing safety-critical components that must endure extreme cyclic stresses without failure. Supplied as a finished product, it guarantees consistent, reliable performance for the most demanding applications worldwide.
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AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Specification
Dimensions
Size：
Diameter 20-1000 mm Length <6394 mm
Size:We can customized as required
Standard：
Per your request or drawing
We can customized as required
Properties（Theoretical）
Chemical Composition
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AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper Properties
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Applications of AISI 9255 Steel Flange, oil quenched from 885°C (1625°F), 540°C (1000°F) temper
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Chemical Identifiers AISI 9255 Steel Flange, oil quenched from 885°C (1625°F), 540°C (1000°F) temper
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Packing of AISI 9255 Steel Flange, oil quenched from 885°C (1625°F), 540°C (1000°F) temper
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Standard Packing:
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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 2865 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
