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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AK Steel Flange ASTM A 907, Grade 40 Hot Rolled Carbon Steel Flange, Structural Quality (SQ) Product Information
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AK Steel Flange ASTM A 907, Grade 40 Hot Rolled Carbon Steel Flange, Structural Quality (SQ) Synonyms
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AK Steel ASTM A 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Product Information
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# **Product Introduction: AK Steel ASTM A907 Grade 40 Hot Rolled Carbon Steel**
**AK Steel ASTM A907 Grade 40 (SQ)** is a **higher-strength, hot-rolled carbon steel sheet and strip** produced in **heavy thickness coils** for structural applications requiring **40 ksi (275 MPa) minimum yield strength**. This grade offers enhanced load-bearing capacity compared to lower-strength grades while maintaining **good fabricability and weldability**. As a coil-processed material under the A907 specification, it provides **consistent mechanical properties and dimensional uniformity** ideal for high-volume manufacturing of structural components that benefit from the 40 ksi strength level.
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## **International Standard & Key Specifications**
* **Primary Standard:** **ASTM A907/A907M** - Standard Specification for Steel, Sheet and Strip, Heavy Thickness Coils, Hot-Rolled, Carbon, Commercial, Drawing, Structural, and High-Strength Low-Alloy, Grades 30[205] Through 70[480].
* **Product Form:** **Heavy thickness coils** - Supplied in coil form for processing into cut lengths or formed products.
* **Quality Designation:** **Structural Quality (SQ)** - Meets standard requirements for structural fabrication.
* **Related Standards:**
* **ASTM A568/A568M** - General Requirements for Steel Sheet.
* **ASTM A1011/A1011M** - Specification for Hot-Rolled Structural Steel.
* **Strength Position:** Represents a **mid-range strength option** within the standard carbon steel grades, balancing increased capacity with maintainable fabricability.
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## **Chemical Composition (Weight %, max)**
The chemistry is controlled to achieve the 40 ksi yield strength while maintaining adequate weldability and formability.
| Element | Composition (%) | Role in Performance |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.25 max | Primary strengthener; typically at higher end of range for Grade 40. |
| **Manganese (Mn)** | 0.90 max | Enhances strength and hardenability; critical for 40 ksi target. |
| **Phosphorus (P)** | 0.04 max | Impurity, kept low for formability. |
| **Sulfur (S)** | 0.05 max | Impurity, controlled for weldability. |
| **Silicon (Si)** | 0.30 max | Deoxidizer and solid solution strengthener. |
| **Carbon Equivalent (CE)** | Typically 0.38-0.42 | Higher than lower grades; requires attention during welding. |
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## **Typical Physical & Mechanical Properties**
| Property | Value / Description |
| :--- | :--- |
| **Tensile Strength** | 425 - 585 MPa (62,000 - 85,000 psi) |
| **Yield Strength (min)** | **275 MPa (40,000 psi)** |
| **Elongation in 2-in (50 mm) (min)** | **21%** |
| **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) |
| **Density** | ~7.85 g/cm³ |
| **Formability** | **Moderate to Good.** Suitable for bending and moderate forming. Minimum bend radius typically **1-1.5 × thickness**. |
| **Weldability** | **Good with proper procedures.** May require preheat for thicker sections (>1/4 inch/6 mm) or highly restrained joints. |
| **Surface Finish** | Standard hot-rolled; pickled and oiled available for improved surface. |
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## **Product Applications**
**Medium-Strength Structural Components:**
- **Primary framing members** in industrial buildings (purlins, girts)
- **Heavy-duty supports and brackets** for equipment
- **Trailer main rails and structural members**
**Transportation Equipment:**
- **Truck chassis components** and frame reinforcements
- **Agricultural equipment frames** and implement parts
- **Bus and RV structural members**
**Industrial Fabrication:**
- **Machine bases and support structures**
- **Heavy-duty shelving and storage systems**
- **Platforms, walkways, and access structures**
**Construction Products:**
- **Heavy formwork and shoring components**
- **Temporary bridge and structure members**
- **Sign and signal support structures**
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## **Advantages and Fabrication Considerations**
*Advantages:*
- **Enhanced Strength:** 40 ksi yield provides 11-33% increase over lower grades (33/36 ksi)
- **Material Efficiency:** Allows lighter designs or higher load capacity
- **Good Fabricability:** Maintains reasonable formability and weldability
- **Cost-Effective:** Economical alternative to microalloyed steels for many applications
*Fabrication Considerations:*
1. **Welding Requirements:** Due to higher carbon equivalent:
- **Preheat recommended:** 200-250°F (95-120°C) for thicknesses >1/4 inch (6 mm)
- **Low-hydrogen practices:** Use E7018 electrodes or equivalent
- **Control heat input:** Avoid excessive heat to prevent HAZ brittleness
2. **Forming Limitations:**
- Increased springback compared to lower-strength grades
- May require over-bending to achieve desired angles
- Not recommended for severe forming or deep drawing
3. **Surface Preparation:**
- Mill scale must be thoroughly removed for optimal coating adhesion
- Pickled and oiled condition recommended for painting applications
4. **Alternative Considerations:**
- For better weldability/formability at similar strength, consider ASTM A1011 HSLAS Grade 45
- For higher strength needs, evaluate ASTM A1011 HSLAS Grade 50-80
**In summary, AK Steel ASTM A907 Grade 40 provides a practical 40 ksi minimum yield strength solution for structural applications requiring enhanced load capacity. While offering good strength-to-cost ratio, it requires more careful fabrication practices than lower-strength carbon steels, particularly in welding and forming operations. Proper application engineering and fabrication procedures are essential to leverage its strength advantages effectively.**
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AK Steel ASTM A 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4564 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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AK Steel ASTM A 907, Grade 40 Hot Rolled Carbon Steel, Structural Quality (SQ) Properties
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Applications of AK Steel Flange ASTM A 907, Grade 40 Hot Rolled Carbon Steel Flange, Structural Quality (SQ)
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Chemical Identifiers AK Steel Flange ASTM A 907, Grade 40 Hot Rolled Carbon Steel Flange, Structural Quality (SQ)
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Packing of AK Steel Flange ASTM A 907, Grade 40 Hot Rolled Carbon Steel Flange, Structural Quality (SQ)
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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 1035 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
