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 1551 Steel Flange Composition Spec (UNS G15510) Product Information
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AISI 1551 Steel Flange Composition Spec (UNS G15510) Synonyms
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AISI 1551 Steel Composition Spec (UNS G15510) Product Information
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### **Product Introduction: AISI 1551 Steel Composition Specification (UNS G15510)**
**Overview**
AISI 1551 (UNS G15510) is a standardized **high-carbon, high-manganese alloy steel** defined by its specific chemical composition. As a member of the "15xx" series of **manganese alloy steels**, it is characterized by a significantly elevated manganese content (1.10-1.40%) combined with a high carbon level, positioning it as a grade with excellent hardenability and high strength potential. This composition is engineered to provide superior performance over plain carbon steels of similar carbon content (e.g., 1051, 1055) by enabling deeper and more uniform hardening in substantial cross-sections. It serves as a versatile, cost-effective engineering steel for components demanding high strength, good wear resistance, and reliable response to heat treatment.
**Key Features & Characteristics**
* **Excellent Hardenability & High Strength Potential:** The high manganese content provides deep hardenability, allowing the steel to be effectively through-hardened (quenched and tempered) in larger cross-sections to achieve high tensile and yield strength with good core properties.
* **Good Wear Resistance:** In the properly heat-treated condition, it offers good resistance to abrasion and surface wear, making it suitable for components in sliding or rolling contact under load.
* **Good Toughness Balance:** When properly tempered, it can achieve a favorable balance of strength and impact resistance for many demanding applications, though inherent toughness is lower than lower-carbon alloy steels at equivalent hardness.
* **Good Forgeability:** Suitable for hot forging operations, with manganese aiding high-temperature workability.
* **Economic High-Strength Alternative:** Provides a more economical solution compared to chromium-molybdenum alloy steels (e.g., 4150, 6150) for many applications where ultra-deep hardening is not required, but high strength and hardenability are paramount.
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### **1. Chemical Composition (Standard Conformance)**
| Element | Standard Range (%) | Key Function |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.45 – 0.56 | **High carbon content.** Primary source of hardness, strength, and wear resistance. Enables the formation of high-carbon martensite upon quenching. |
| **Manganese (Mn)** | 1.10 – 1.40 | **Primary Alloying Element.** Significantly enhances hardenability, allowing for effective through-hardening of substantial sections. Contributes to strength and promotes a fine grain structure. |
| **Phosphorus (P)** | ≤ 0.040 (max) | Residual element, kept very low to maintain toughness. |
| **Sulfur (S)** | ≤ 0.050 (max) | Residual element, kept low. **This is not a free-machining steel.** |
| **Silicon (Si)** | 0.15 – 0.35 | Acts as a deoxidizer; contributes to strength. |
| **Iron (Fe)** | Balance | Base element. |
**Key International Standard Equivalents:**
* **UNS:** G15510
* **AISI/SAE:** 1551
* **ASTM:** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought and Cold-Finished)
* **ASTM:** A519 (for mechanical tubing)
* **DIN (Germany):** ~1.1213 / C55 (approximate, but with much lower Mn; no direct equivalent)
* **EN (Europe):** No direct equivalent. Similar in concept to a higher-manganese variant of 1.1203 (C55).
* **JIS (Japan):** No direct equivalent; similar to higher-carbon grades like S55C but with higher Mn.
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### **2. Typical Physical & Mechanical Properties (Condition Dependent)**
*Properties are highly dependent on heat treatment. The as-rolled or normalized condition is for machining; quenching & tempering develops final service properties.*
| Property / Condition | Normalized/Hot-Rolled | Quenched & Tempered (Example) |
| :--- | :--- | :--- |
| **Density** | 7.85 g/cm³ | 7.85 g/cm³ |
| **Tensile Strength** | 650 – 800 MPa | 1050 – 1400+ MPa |
| **Yield Strength (0.2% Offset)** | 400 – 600 MPa | 850 – 1200+ MPa |
| **Elongation (in 50mm)** | 15% – 20% | 8% – 14% |
| **Reduction of Area** | 35% – 50% | 25% – 40% |
| **Brinell Hardness (HB)** | 200 – 250 | 350 – 450 (HRC 38-48) |
| **Machinability (Normalized)** | Poor (~35% of AISI 1212) | Very Poor |
| **Impact Toughness** | Moderate | Fair to Good (highly dependent on tempering temperature) |
| **Hardenability (Jominy)** | High. Suitable for through-hardening sections up to ~50-75mm (2-3 in) with oil quenching. | |
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### **3. Product Applications**
AISI 1551 is selected for high-stress, wear-resistant components that benefit from its excellent hardenability and high strength.
* **High-Stress Shafts and Axles:** Drive shafts, axle shafts, crankshafts, and heavy-duty transmission shafts that are through-hardened.
* **Forged Components:** Connecting rods, lever arms, yoke arms, and other high-strength forged parts.
* **Wear-Resistant Parts:** Plow shares, scraper blades, bucket teeth, crusher rolls, and other earth-moving/mining components.
* **Gears and Sprockets:** Medium to heavy-duty gears, pinions, and sprockets that are through-hardened for wear resistance.
* **High-Strength Fasteners:** Large bolts, studs, and pins requiring very high tensile strength.
* **Tooling and Die Components:** Parts requiring high hardness and good hardenability, such as certain punches and dies.
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### **4. Important Distinctions & Considerations**
* **Not a Free-Machining Steel:** Contains low sulfur. Machinability is poor. Machining is typically performed in the normalized or annealed state with robust tooling.
* **Heat Treatment is Standard:** This steel is almost always heat treated (quenched and tempered) to achieve its designed mechanical properties. Normalizing is a common pre-machining treatment.
* **Quenching & Tempering Sensitivity:** Due to its high carbon content, it is more susceptible to quench cracking than lower-carbon grades. **Proper quenchant selection (typically oil), controlled agitation, and immediate tempering are critical.**
* **Weldability:** **Poor.** Not recommended for general fabrication. If welding is unavoidable, it requires extensive preheating (300-400°C / 575-750°F), low-hydrogen electrodes, strict interpass temperature control, and a controlled post-weld heat treatment (PWHT) cycle.
* **Toughness Consideration:** While strong and hard, its toughness (especially impact toughness) is lower than that of alloy steels like 4140 or 4340 at similar hardness levels. It is best suited for applications involving high compressive or abrasive wear.
* **Comparison to 1050/1055:** Offers vastly superior hardenability and strength, allowing larger sections to be effectively heat treated.
* **Comparison to 1547/1548:** Has slightly lower manganese than 1547/1548 but a similar or slightly higher carbon range. Hardenability is slightly lower but still very high. Often interchangeable with 1547/1548 for many applications.
* **"H" Grade Availability:** **AISI 1551H** is available for applications requiring guaranteed hardenability bands (per SAE J1268), providing predictable heat treatment response for critical components.
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**Disclaimer:** The information provided is based on standard industry specifications for reference. Actual properties and performance depend on specific manufacturing methods, heat treatment cycles, section size, and final part geometry. This is a high-performance steel requiring expertise in heat treatment. For engineering applications, always consult the certified material test report (CMTR) and relevant application standards.
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AISI 1551 Steel Composition Spec (UNS G15510) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5049 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 1551 Steel Composition Spec (UNS G15510) Properties
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Applications of AISI 1551 Steel Flange Composition Spec (UNS G15510)
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Chemical Identifiers AISI 1551 Steel Flange Composition Spec (UNS G15510)
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Packing of AISI 1551 Steel Flange Composition Spec (UNS G15510)
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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 1520 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
