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 1139 Steel Flange Composition Spec (UNS G11390) Product Information
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AISI 1139 Steel Flange Composition Spec (UNS G11390) Synonyms
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AISI 1139 Steel Composition Spec (UNS G11390) Product Information
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## **Product Data Sheet: AISI 1139 Steel (UNS G11390) - Composition Specification**
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### **1. Product Overview**
**AISI 1139 (UNS G11390)** is a **high-sulfur, medium-carbon, free-machining steel** specifically engineered for applications where **exceptional machinability is the paramount requirement**. It represents the high-sulfur variant within the 11xx series, containing significantly more sulfur than standard grades like 1117 or 1132. This elevated sulfur content, typically ranging from 0.32% to 0.39%, creates an abundance of manganese sulfide (MnS) inclusions that act as powerful, internal chip breakers during machining operations.
This grade is designed as a **niche, high-productivity material** for manufacturing non-critical components on high-speed automatic screw machines and CNC lathes. Its primary identity is defined by its chemical composition, which prioritizes ease and speed of chip removal over other material properties such as weldability, transverse ductility, and forgeability.
**Key Characteristics of AISI 1139 (G11390):**
* **Superlative Machinability:** Possesses one of the highest machinability ratings among standard carbon steels due to its very high sulfur content, enabling maximum cutting speeds, superior surface finish, and minimal tool wear.
* **Limited Mechanical Properties:** The high sulfur content introduces significant anisotropy, resulting in poor ductility and impact toughness, especially in directions transverse to the rolling direction. It has lower tensile strength compared to lower-sulfur medium carbon steels.
* **Non-Weldable and Non-Hardenable:** The combination of high sulfur and medium carbon makes it completely unsuitable for welding (extreme hot cracking risk) and ineffective for conventional heat treatment like quenching and tempering or carburizing.
* **Economical for High-Volume Machining:** Its ability to drastically reduce machining cycle time and tooling costs can make it the most economical choice for specific high-volume production runs of non-structural parts.
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### **2. Chemical Composition (Standard % by Weight) - UNS G11390**
The composition is strictly optimized for extreme machinability, with sulfur as the dominant defining element.
| Element | Content (%) | Specification Source (Typical) | Function & Implication |
| :--- | :--- | :--- | :--- |
| **Carbon (C)** | 0.35 - 0.43 | ASTM A108, SAE J403 | Provides basic strength but is too high for easy machining without the high sulfur; the MnS inclusions counteract the tool wear typically caused by this carbon level. |
| **Manganese (Mn)** | 1.35 - 1.65 | ASTM A108, SAE J403 | **Balances Sulfur.** Present in sufficient quantity to combine with all sulfur, forming MnS inclusions. Excess Mn increases hardenability slightly, but heat treatment is not recommended. |
| **Phosphorus (P)** | ≤ 0.040 | ASTM A108, SAE J403 | Residual element, kept low. |
| **Sulfur (S)** | **0.32 - 0.39** | **DEFINING ELEMENT.** ASTM A108, SAE J403 | **Extreme Machinability Agent.** This very high level creates a high volume fraction of MnS inclusions, providing outstanding chip-breaking action but severely compromising ductility, toughness, and weldability. |
| **Iron (Fe)** | Balance | | Base metal. |
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### **3. Typical Physical & Mechanical Properties**
*Properties are highly dependent on the form (hot rolled vs. cold drawn) and size. Cold drawing improves strength and finish. Properties are highly anisotropic.*
| Property | Typical Value (Cold Drawn Condition) | Notes |
| :--- | :--- | :--- |
| **Tensile Strength** | 550 - 690 MPa (80,000 - 100,000 psi) | Moderate strength, heavily influenced by cold work. |
| **Yield Strength (0.2% Offset)** | 480 - 620 MPa (70,000 - 90,000 psi) | |
| **Elongation (in 50 mm)** | 10% - 18% (Longitudinal) | **Very low in transverse direction (often < 5%).** |
| **Reduction of Area** | 25% - 40% (Longitudinal) | **Very low in transverse direction.** |
| **Hardness** | 179 - 229 HB | |
| **Machinability Rating** | **~ 160-180%** (vs. AISI 1212 = 100%) | Excellent; among the best for a non-leaded steel. |
| **Impact Toughness** | **Very Low** | Especially poor in transverse orientation. |
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### **4. International Standards & Cross-References**
AISI 1139 is covered under standard free-machining steel specifications.
| Standard System | Equivalent Designation | Applicable Specification / Form |
| :--- | :--- | :--- |
| **UNS (USA)** | **G11390** | Unified Numbering System |
| **ASTM (USA)** | AISI 1139 | **ASTM A108** (Cold-Finished Carbon Steel Bars) |
| **SAE (USA)** | SAE 1139 | SAE J403 |
| **AMS (Aerospace)** | - | *Not typically used in aerospace due to poor properties.* |
| **DIN (Germany)** | **1.0736** (44S20) | DIN EN 10277 | German "S" designation indicates high sulfur for machining. |
| **BS (UK)** | **226M44** | BS 970 | Similar high-sulfur, free-cutting grade. |
| **JIS (Japan)** | **SUM 43** | JIS G4804 | Very close equivalent in carbon and high sulfur range. |
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### **5. Primary Applications**
AISI 1139 is used **exclusively for non-structural, non-welded, non-heat-treated components** where minimizing machining cost and time is the absolute priority.
* **High-Speed Screw Machine Products:** Nuts, bolts, studs, fittings, spacers, and bushings produced on multi-spindle automatics and Swiss-type lathes.
* **Electrical & Plumbing Fittings:** Connector bodies, coupling nuts, valve parts, and other plated or coated components.
* **Non-Critical Automotive Parts:** Door lock components, sensor housings, trim clips, and various interior brackets not subject to impact or stress.
* **Consumer Hardware & Appliance Parts:** Knobs, fasteners, decorative elements, and internal mechanism components.
* **General Free-Machining Components:** Any part requiring complex geometry and an excellent as-machined surface finish, with no subsequent service demands for strength, toughness, or weldability.
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### **6. Critical Processing & Handling Notes**
* **Heat Treatment: NOT APPLICABLE.** The high sulfur content makes it **unsuitable for case hardening or through-hardening**. Attempts will result in poor surface integrity, embrittlement, and likely cracking.
* **Machining: EXCELLENT.** This is its sole purpose. It machines with very low cutting forces, produces small, easily evacuated chips, and yields an excellent surface finish. Use sharp tools and adequate coolant.
* **Weldability: EXTREMELY POOR / PROHIBITED.** The very high sulfur content guarantees severe hot cracking (solidification cracking). **Welding is strictly forbidden** for any application.
* **Hot Working: NOT SUITABLE.** Highly prone to hot shortness (cracking) during forging or hot forming due to the sulfur-rich grain boundaries.
* **Cold Forming: VERY POOR.** Exhibits extreme anisotropy and very low transverse ductility. Any bending, heading, or forming operation carries a high risk of cracking and is not recommended.
* **Health & Safety:** Standard industrial hygiene practices for machining metals apply. Ensure proper ventilation and chip management.
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### **7. Comparison with Key Grades**
* **vs. AISI 1132:** 1139 has **much higher sulfur** (~0.35% vs. ~0.10%) and **slightly higher carbon**. This gives 1139 superior machinability but drastically worse ductility, toughness, and weldability. 1132 is a more balanced, general-purpose grade.
* **vs. 12L14:** 12L14 contains lead for even better chip control and machinability, plus higher phosphorus. 12L14 generally offers the best overall machinability. AISI 1139 is a high-sulfur, non-leaded alternative that trades some machinability for slightly higher strength due to its carbon content.
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**Disclaimer: AISI 1139 (UNS G11390) is a highly specialized material with severe limitations. Its selection must be justified solely by machining economics for non-critical parts. Engineers must fully understand and design around its poor mechanical properties, anisotropy, and non-weldability. Always consult the supplier's certification and Safety Data Sheets (SDS) before use.**
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AISI 1139 Steel Composition Spec (UNS G11390) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4955 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 1139 Steel Composition Spec (UNS G11390) Properties
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Applications of AISI 1139 Steel Flange Composition Spec (UNS G11390)
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Chemical Identifiers AISI 1139 Steel Flange Composition Spec (UNS G11390)
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Packing of AISI 1139 Steel Flange Composition Spec (UNS G11390)
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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 1426 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
