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 1140 Steel Flange Composition Spec (UNS G11400) Product Information
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AISI 1140 Steel Flange Composition Spec (UNS G11400) Synonyms
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AISI 1140 Steel Composition Spec (UNS G11400) Product Information
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## **Product Data Sheet: AISI 1140 Steel Composition Specification (UNS G11400)**
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### **1. Product Overview**
**AISI 1140 (UNS G11400)** is a medium-carbon, **resulfurized free-machining steel** designed as a versatile engineering material that balances machinability with good mechanical strength and hardenability. As a composition specification, it defines the baseline chemical requirements for this grade, which can be supplied in various conditions including hot-rolled, cold-drawn, annealed, normalized, or heat-treated.
This steel occupies a strategic position between standard carbon steels (like 1040) and high-sulfur free-machining grades (like 1144/1141). It provides **significantly improved machinability over non-resulfurized grades** while maintaining better transverse ductility and weldability than higher-sulfur variants. AISI 1140 is commonly selected for components that will undergo extensive machining followed by heat treatment to achieve required service properties.
**Key Characteristics of AISI 1140 Composition:**
* **Enhanced Machinability:** The controlled sulfur addition (0.08-0.13%) provides improved chip breaking and reduced cutting forces compared to non-resulfurized steels of similar carbon content (like 1040).
* **Good Strength & Hardenability:** The medium carbon content (0.37-0.44%) combined with manganese (0.70-1.00%) provides a solid foundation for mechanical strength and enables effective heat treatment response.
* **Balanced Engineering Properties:** Offers a practical compromise between the excellent machinability of high-sulfur steels and the better weldability/forgeability of standard carbon steels.
* **Versatile Processability:** Can be successfully hot worked, cold drawn, and heat treated to meet a wide range of mechanical property requirements.
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### **2. Chemical Composition (Standard % by Weight) - UNS G11400**
The composition is engineered to provide a balance of strength, moderate hardenability, and improved machinability.
| Element | Content (%) | Specification Source | Function & Implication |
| :--- | :--- | :--- | :--- |
| **Carbon (C)** | 0.37 - 0.44 | ASTM A29, SAE J403 | **Primary strength element.** Determines hardenability and maximum achievable strength through heat treatment. |
| **Manganese (Mn)** | 0.70 - 1.00 | ASTM A29, SAE J403 | **Moderate Hardenability Agent.** Enhances response to quenching. Combines with sulfur to form beneficial MnS inclusions. |
| **Phosphorus (P)** | ≤ 0.040 | ASTM A29, SAE J403 | Residual element, controlled to prevent embrittlement. |
| **Sulfur (S)** | 0.08 - 0.13 | **DEFINING ELEMENT.** ASTM A29, SAE J403 | **Machinability Enhancer.** Forms manganese sulfide (MnS) inclusions that act as chip breakers during machining. |
| **Iron (Fe)** | Balance | | Base metal. |
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### **3. Typical Physical & Mechanical Properties (As-Hot Rolled Condition)**
*Properties vary significantly with processing condition. Below are representative values for hot-rolled material.*
| Property | Typical Range (Hot Rolled) | Notes |
| :--- | :--- | :--- |
| **Tensile Strength** | 560 - 700 MPa (81,000 - 102,000 psi) | |
| **Yield Strength** | 420 - 560 MPa (61,000 - 81,000 psi) | |
| **Elongation (in 50 mm)** | 18% - 25% | |
| **Hardness** | 170 - 220 HB | |
| **Machinability Rating** | **~ 70-75%** (AISI 1212 = 100%) | Good; superior to 1040, less than 1144. |
| **Density** | 7.87 g/cm³ | |
| **Modulus of Elasticity** | 200 GPa | |
**Heat Treated Properties (Example - Quenched & Tempered):**
- **Tensile:** 850 - 1000 MPa
- **Hardness:** 25 - 35 HRC (tempered)
- **Good response to induction hardening**
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### **4. International Standards & Cross-References**
| Standard System | Equivalent Designation | Applicable Specification | Notes |
| :--- | :--- | :--- | :--- |
| **UNS (USA)** | **G11400** | Unified Numbering System | |
| **ASTM (USA)** | AISI 1140 | **ASTM A29** (Hot Rolled), **ASTM A108** (Cold Finished) | |
| **SAE (USA)** | SAE 1140 | SAE J403 | |
| **DIN (Germany)** | **1.0727** (35S20) | DIN EN 10277 | Similar resulfurized grade with slightly different Mn. |
| **BS (UK)** | **212M36** (similar) | BS 970 | Similar properties; exact match requires specification review. |
| **JIS (Japan)** | **SUM 43** | JIS G4804 | Close equivalent in function and composition. |
| **AFNOR (France)** | 35MF4 | NF A35-552 | |
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### **5. Primary Applications**
AISI 1140 is used for components that benefit from improved machinability during manufacturing and require good mechanical properties in service, often after heat treatment.
* **General Machinery Parts:** Shafts, axles, gears, studs, and bolts produced through machining operations.
* **Automotive Components:** Transmission parts, gear blanks, clutch components, and various brackets.
* **Fastener Manufacturing:** Higher-strength bolts, set screws, and special fasteners.
* **Agricultural Equipment:** Pins, bushings, and tillage tool components.
* **Tooling & Industrial Equipment:** Jigs, fixtures, and non-cutting tool parts.
* **Forged Components:** Parts that are hot forged to shape and then machined and heat treated.
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### **6. Processing & Fabrication Characteristics**
* **Heat Treatment:** Responds well to **quenching and tempering**. Typical process: Austenitize at 830-850°C (1525-1560°F), quench in oil or water (depending on section), temper to desired hardness. Also suitable for **surface hardening** (induction, flame).
* **Machinability:** **Good.** The sulfur content provides chip-breaking action. Better than 1040, but not as free-machining as 1144. Recommended machining practices include using sharp tools with positive rake angles.
* **Weldability:** **Fair to Poor.** The sulfur content increases susceptibility to hot cracking. Not recommended for critical welded structures. If welding is necessary, use low-hydrogen electrodes with proper pre-heat (200-300°C) and post-weld heat treatment.
* **Hot Working:** Good hot workability. Suitable for forging between 1150-900°C (2100-1650°F).
* **Cold Working:** Fair in annealed condition. Cold drawing commonly used to produce bright bar.
* **Forging:** Excellent forgeability at appropriate temperatures.
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### **7. Comparison with Key Related Grades**
| Grade | Carbon (%) | Sulfur (%) | Manganese (%) | Primary Difference from AISI 1140 |
| :--- | :--- | :--- | :--- | :--- |
| **AISI 1040** | 0.37-0.44 | ≤0.050 | 0.60-0.90 | Lower sulfur = poorer machinability, better weldability |
| **AISI 1141** | 0.37-0.45 | 0.08-0.13 | 1.35-1.65 | Higher Mn = better hardenability, similar machinability |
| **AISI 1144** | 0.40-0.48 | 0.24-0.33 | 1.35-1.65 | Higher S & Mn = superior machinability, poorer weldability |
| **AISI 1137** | 0.32-0.39 | 0.08-0.13 | 1.35-1.65 | Lower C, higher Mn = slightly lower strength, better hardenability |
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### **8. Limitations & Design Considerations**
1. **Anisotropy:** Exhibits directional properties due to MnS inclusions. Transverse ductility and impact toughness are typically 20-40% lower than longitudinal properties.
2. **Not for Severe Impact Applications:** The combination of medium carbon and sulfur limits toughness, especially in transverse direction.
3. **Weldability Limitation:** Not suitable for primary structural welding applications without extensive precautions.
4. **Heat Treatment Response:** Hardenability is moderate; large sections may not through-harden completely.
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**Disclaimer:** This specification defines chemical composition only. Mechanical properties depend entirely on processing condition (hot rolled, cold drawn, heat treated, etc.). For application-specific requirements, the processing condition must be specified in addition to the grade. Always consult material certifications and Safety Data Sheets (SDS) for the specific product form being used.
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AISI 1140 Steel Composition Spec (UNS G11400) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4974 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 1140 Steel Composition Spec (UNS G11400) Properties
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Applications of AISI 1140 Steel Flange Composition Spec (UNS G11400)
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Chemical Identifiers AISI 1140 Steel Flange Composition Spec (UNS G11400)
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Packing of AISI 1140 Steel Flange Composition Spec (UNS G11400)
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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 1445 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
