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 1552 Steel Flange, Hot Rolled Bar (UNS G15520) Product Information
-:-
For detailed product information, please contact sales.
-:
AISI 1552 Steel Flange, Hot Rolled Bar (UNS G15520) Synonyms
-:-
For detailed product information, please contact sales.
-:
AISI 1552 Steel, Hot Rolled Bar (UNS G15520) Product Information
-:-
For detailed product information, please contact sales.
-:
### **Product Introduction: AISI 1552 Steel, Hot Rolled Bar (UNS G15520)**
**Overview**
AISI 1552 (UNS G15520) is a high-carbon, high-manganese alloy steel supplied in the economical **hot rolled bar** condition. As a prominent member of the "15xx" series of **manganese alloy steels**, it is characterized by a significantly elevated manganese content (1.20-1.50%) combined with a high carbon level, positioning it as a grade with exceptional hardenability and very high strength potential. This composition is engineered to provide superior performance over plain carbon steels (e.g., 1052, 1055) by enabling deep and uniform hardening in substantial cross-sections. Supplied in the as-rolled state, it serves as a versatile and cost-effective raw material for demanding components that will undergo forging, machining, and subsequent heat treatment (normalizing, quenching & tempering), particularly suited for applications requiring maximum strength, good wear resistance, and toughness in heavy-duty service.
**Key Features & Advantages**
* **Exceptional Hardenability & High Strength:** The synergistic effect of high carbon and manganese provides deep hardenability, enabling effective through-hardening of large cross-sections to achieve very high tensile and yield strength after proper heat treatment.
* **Good Wear and Abrasion Resistance:** In the hardened and tempered condition, it offers good resistance to surface wear, making it suitable for components in sliding or rolling contact under high stress.
* **Good Toughness for its Strength Level:** When properly tempered, it achieves a favorable balance of strength and impact resistance, which is crucial for components subject to dynamic or shock loading in industrial and off-highway applications.
* **Excellent Forgeability:** Highly suitable for hot forging into complex shapes. The manganese improves high-temperature workability and contributes to good final forged properties.
* **Cost-Effective Ultra-High-Strength Material:** Provides a performance level that can approach that of some low-alloy steels (e.g., 4150) at a typically lower material cost, making it an economical choice for many heavy-duty, wear-intensive applications.
---
### **1. Chemical Composition (Standard Conformance)**
| Element | Standard Range (%) | Key Function |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.47 – 0.55 | **High carbon content.** Primary source of hardness, strength, and wear resistance. Enables formation of high-carbon martensite upon quenching. |
| **Manganese (Mn)** | 1.20 – 1.50 | **Primary Alloying Element.** Dramatically increases hardenability, ensuring deep and uniform hardening. Contributes significantly 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 | Deoxidizer; contributes to strength. |
| **Iron (Fe)** | Balance | Base element. |
**Key International Standard Equivalents:**
* **UNS:** G15520
* **AISI/SAE:** 1552
* **ASTM:** A29 (Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought)
* **ASTM:** A519 (for mechanical tubing)
* **DIN (Germany):** ~1.1213 / C55 (approximate, but with much lower Mn; no direct equivalent)
* **EN (Europe):** No direct equivalent.
* **JIS (Japan):** No direct equivalent; similar to a higher-carbon, higher-manganese version of SMn443.
---
### **2. Typical Physical & Mechanical Properties (Hot Rolled, As-Rolled Condition)**
*Note: These are typical properties in the as-supplied state. Final service properties are developed through heat treatment.*
| Property | Typical Value / Description |
| :--- | :--- |
| **Density** | 7.85 g/cm³ (0.284 lb/in³) |
| **Tensile Strength** | 680 – 850 MPa (99 – 123 ksi) |
| **Yield Strength (0.2% Offset)** | 430 – 620 MPa (62 – 90 ksi) |
| **Elongation (in 50mm)** | 14% – 20% |
| **Reduction of Area** | 35% – 50% |
| **Brinell Hardness (HB)** | 210 – 270 |
| **Machinability (As-Rolled)** | **Very Poor (~25-30% of AISI 1212).** Machining in this state is extremely difficult; normalizing or annealing prior to any significant machining is **essential**. |
| **Surface Condition** | Standard hot-rolled finish with mill scale. |
---
### **3. Product Applications**
AISI 1552 hot rolled bars are used for ultra-high-strength, wear-resistant components across heavy industries.
* **High-Stress Shafts and Axles:** Drive shafts, axle shafts, transmission shafts, and roller shafts in heavy machinery that will be through-hardened for maximum strength and fatigue resistance.
* **Forged Components:** Crankshafts, connecting rods, lever arms, and other high-strength forged parts requiring a combination of toughness and strength.
* **Wear-Resistant Parts:** Plow shares, scraper blades, bucket teeth, crusher liners, mill hammers, and other mining/agricultural components subject to severe abrasion.
* **Gears and Sprockets:** Heavy-duty gears and sprockets that are through-hardened for wear resistance where case hardening is not required.
* **High-Strength Fasteners and Pins:** Very large bolts, studs, and pins requiring extreme tensile strength, often used in construction, mining, and energy sectors.
* **General High-Wear Machine Parts:** Wear plates, mandrels, and other components requiring high hardness and good core strength.
---
### **4. Critical Considerations**
* **Not a Free-Machining Steel:** Contains low sulfur. Machining in the as-rolled state is **prohibitively difficult**. **Normalizing or full annealing prior to any machining is mandatory** for practical production.
* **Heat Treatment is Mandatory for Service:** This steel derives its value from heat treatment. It requires quenching & tempering to achieve its ultra-high-strength properties. **Immediate and proper tempering after quenching is absolutely critical** to relieve stresses, prevent cracking, and develop required toughness.
* **High Quenching Sensitivity:** Due to its high carbon content, it is **highly susceptible to quench cracking**. Proper quenchant selection (typically oil), controlled agitation, and favorable part geometry are vital.
* **Toughness Consideration:** While strong and hard, its impact toughness is limited compared to alloy steels like 4140 or 4340 at similar hardness levels. It is best suited for applications dominated by **compressive loads, abrasion, and controlled stress** rather than severe, unconstrained impact.
* **Weldability:** **Very Poor. Not recommended for welding.** If absolutely unavoidable, it requires extensive preheating (350-450°C / 660-840°F), low-hydrogen electrodes, stringent interpass temperature control, and a controlled post-weld heat treatment (PWHT) cycle. The risk of cracking is very high.
* **Comparison to 1052/1055:** AISI 1552 offers vastly superior hardenability and strength.
* **Comparison to 1547/1551:** Very similar in performance; often considered part of a group of closely related high-carbon, high-manganese grades (1547, 1548, 1551, 1552) with minor variations in carbon/manganese ranges. Selection among them is often based on mill availability and specific hardenability requirements.
* **"H" Grade Availability:** An **AISI 1552H** grade exists for applications requiring guaranteed hardenability bands (SAE J1268), ensuring predictable heat treatment results for critical components.
---
**Disclaimer:** **AISI 1552 is a specialized, high-performance steel that requires expert knowledge in heat treatment and machining.** The information provided is based on standard specifications. Actual properties may vary. This material is not suitable for general fabrication. For engineering applications, always consult certified material test reports and conduct thorough process validation. The as-rolled condition is suitable only for hot working or as stock for controlled thermal and mechanical processing.
-:-
For detailed product information, please contact sales.
-:
AISI 1552 Steel, Hot Rolled Bar (UNS G15520) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <5050 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 1552 Steel, Hot Rolled Bar (UNS G15520) Properties
-:-
For detailed product information, please contact sales.
-:
Applications of AISI 1552 Steel Flange, Hot Rolled Bar (UNS G15520)
-:-
For detailed product information, please contact sales.
-:
Chemical Identifiers AISI 1552 Steel Flange, Hot Rolled Bar (UNS G15520)
-:-
For detailed product information, please contact sales.
-:
Packing of AISI 1552 Steel Flange, Hot Rolled Bar (UNS G15520)
-:-
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 1521 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
