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.
-:
Bethlehem Steel Flange ASTM A678 Grade A 3/16 to 1-1/2 in. thick, Steel Flange plate Product Information
-:-
For detailed product information, please contact sales.
-:
Bethlehem Steel Flange ASTM A678 Grade A 3/16 to 1-1/2 in. thick, Steel Flange plate Synonyms
-:-
For detailed product information, please contact sales.
-:
Bethlehem Steel ASTM A678 Grade A 3/16 to 1-1/2 in. thick, steel plate Product Information
-:-
For detailed product information, please contact sales.
-:
## **Product Datasheet: Bethlehem Steel ASTM A678 Grade A Steel Plate**
**Product Overview**
Bethlehem Steel ASTM A678 Grade A is a high-strength, low-alloy (HSLA) structural steel plate produced by **quenching and tempering (Q&T) heat treatment**. This manufacturing process involves austenitizing, water quenching, and subsequent tempering, which yields a fine-grained, tempered martensite or bainitic microstructure. This structure provides an exceptional balance of high strength, excellent toughness, and superior weldability compared to as-rolled or normalized steels of similar strength levels. This plate is available in thicknesses ranging from **3/16 inch (4.8 mm) to 1-1/2 inches (38.1 mm)**.
**Key International Standards**
* **Primary Standard:** **ASTM A678 / A678M** - Standard Specification for Quenched-and-Tempered Carbon and High-Strength Low-Alloy Structural Steel Plate.
* **Governing Specification:** This product strictly conforms to all requirements for **Grade A** as defined in ASTM A678. Grade A is one of the lower-strength grades within the A678 family, designed for applications requiring improved toughness and formability alongside enhanced strength.
* **Additional Standards:** It may also be specified to meet supplementary requirements from ASTM A6, such as impact testing (S1) or ultrasonic examination (S7).
**Chemical Composition (Weight % - ASTM A678 Grade A Requirements & Typical Range)**
The chemistry is carefully controlled to ensure proper hardenability during quenching and to develop the desired tempered microstructure without compromising weldability.
| Element | ASTM A678 Grade A Requirement (Max, unless noted) | Typical Bethlehem Steel Production Range |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.23% | 0.18 - 0.22% |
| **Manganese (Mn)** | 1.50% | 1.00 - 1.40% |
| **Phosphorus (P)** | 0.035% | ≤ 0.025% |
| **Sulfur (S)** | 0.05% | ≤ 0.025% |
| **Silicon (Si)** | 0.15 - 0.50% | 0.15 - 0.30% |
| **Copper (Cu)** | 0.20% Min (when specified) | 0.20 - 0.35% (for atmospheric corrosion resistance) |
| **Nickel (Ni)** | -- | May be added in small amounts (e.g., 0.25% max) for toughness |
| **Chromium (Cr)** | -- | May be added in small amounts (e.g., 0.25% max) for hardenability |
| **Molybdenum (Mo)** | -- | May be added in small amounts (e.g., 0.08% max) for hardenability |
| **Vanadium (V)** | -- | May be added (e.g., 0.08% max) for grain refinement |
| **Carbon Equivalent (C.E. IIW)** | Not specified in standard | Typically 0.40 - 0.48 (favorable for Q&T steel) |
**Physical & Mechanical Properties (ASTM A678 Grade A Requirements)**
| Property | Requirement for Grade A | Typical Performance / Notes |
| :--- | :--- | :--- |
| **Yield Strength (Min)** | 50 ksi (345 MPa) | Typically 55 - 65 ksi (380 - 450 MPa) |
| **Tensile Strength** | 70 - 90 ksi (485 - 620 MPa) | Typically 75 - 85 ksi (517 - 586 MPa) |
| **Elongation in 2" (Min)** | 22% (for plates ≤ 3/4") | Often exceeds minimum, typically 24-28% |
| **Elongation in 8" (Min)** | 18% (for plates ≤ 3/4") | -- |
| **Modulus of Elasticity** | ~29,000 ksi (200 GPa) | ~29,000 ksi (200 GPa) |
| **Density** | 0.284 lb/in³ (7.85 g/cm³) | 0.284 lb/in³ (7.85 g/cm³) |
| **Key Feature** | **Quenched & Tempered Microstructure:** Provides a superior combination of strength and toughness, with a more uniform hardness profile through the thickness compared to as-rolled plates. Excellent low-temperature impact resistance is a hallmark of Q&T steels. | |
**Product Applications**
The unique properties of ASTM A678 Grade A Q&T plate made it suitable for demanding applications where reliability under dynamic or impact loading is critical.
* **Structural Engineering:** Welded bridges, especially fracture-critical members, building columns in seismic zones, and offshore platform nodes.
* **Heavy Equipment & Mining:** Key components for excavator arms, loader booms, and mining shovel dippers where resistance to shock and abrasion is needed.
* **Material Handling:** Crane runways, trolley frames, and heavy-duty forklift masts subjected to cyclic loading.
* **Pressure Vessels & Storage Tanks:** For applications requiring higher strength than standard carbon steel with certified impact properties.
* **Military & Defense:** Structural components in vehicles and equipment where ballistic or blast resistance is a consideration.
**Advantages & Fabrication Notes**
* **Exceptional Toughness:** The Q&T process yields excellent notch toughness and resistance to brittle fracture, often meeting stringent Charpy V-Notch requirements at low temperatures (e.g., -50°F / -46°C).
* **Good Weldability:** Despite its high strength, the relatively low carbon content and lean alloy design result in a moderate carbon equivalent. However, strict low-hydrogen welding practices and proper preheat/interpass temperature control are **essential** to preserve the heat-affected zone (HAZ) properties.
* **Uniform Properties:** The through-thickness mechanical properties are more consistent than in as-rolled plates, with less strength drop-off in the center of thick sections.
* **Formability:** Can be cold formed, but bending radii should be larger than for lower-strength steels to avoid cracking. Hot forming is possible but requires re-quenching and tempering to restore properties.
* **Legacy Product Note:** Bethlehem Steel was a significant producer of A678 plate. Modern Q&T steels meeting ASTM A678 Grade A are readily available from contemporary steel mills.
**Disclaimer:**
This datasheet is based on historical data for **Bethlehem Steel Corporation’s** product conforming to **ASTM A678 Grade A**. For current procurement, specify the active **ASTM A678 Grade A** standard along with any required supplementary conditions (e.g., impact testing temperature). Source material from modern producers who can provide current Mill Test Certificates that include heat treatment records and certified mechanical properties. Always follow the steel producer’s recommended welding and fabrication procedures.
-:-
For detailed product information, please contact sales.
-:
Bethlehem Steel ASTM A678 Grade A 3/16 to 1-1/2 in. thick, steel plate Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4662 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.
-:
Bethlehem Steel ASTM A678 Grade A 3/16 to 1-1/2 in. thick, steel plate Properties
-:-
For detailed product information, please contact sales.
-:
Applications of Bethlehem Steel Flange ASTM A678 Grade A 3/16 to 1-1/2 in. thick, Steel Flange plate
-:-
For detailed product information, please contact sales.
-:
Chemical Identifiers Bethlehem Steel Flange ASTM A678 Grade A 3/16 to 1-1/2 in. thick, Steel Flange plate
-:-
For detailed product information, please contact sales.
-:
Packing of Bethlehem Steel Flange ASTM A678 Grade A 3/16 to 1-1/2 in. thick, Steel Flange plate
-:-
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 1133 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
