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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Bethlehem Steel Flange ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, Steel Flange plate Product Information
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Bethlehem Steel Flange ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, Steel Flange plate Synonyms
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Bethlehem Steel ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, steel plate Product Information
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## **Product Datasheet: Bethlehem Steel ASTM A808 (Sulfur Restricted) Steel Plate**
**Product Overview**
Bethlehem Steel ASTM A808 (Sulfur Restricted) is a premium-grade, high-strength low-alloy (HSLA) **phosphorus-enhanced weathering steel** plate engineered for applications demanding superior **through-thickness (Z-direction) ductility**, **improved weldability**, and **enhanced toughness** alongside its inherent atmospheric corrosion resistance. This variant of the standard ASTM A808 specification incorporates a critical supplementary requirement: the strict limitation of sulfur content. By reducing sulfur to very low levels (typically ≤ 0.010%), this plate minimizes the presence of elongated manganese sulfide inclusions, which are the primary initiators of lamellar tearing in thick welded joints and can impair impact toughness. It maintains all the benefits of ASTM A808—including a 50 ksi minimum yield strength and corrosion resistance four times that of copper-bearing carbon steel—while offering improved performance for critical, restrained weldments. This plate is available in thicknesses from **3/16 inch (4.8 mm) to 1-1/2 inches (38.1 mm)**.
**Key International Standards & Specifications**
* **Primary Standard:** **ASTM A808 / A808M** - Standard Specification for High-Strength Low-Alloy Structural Steel Plate with Atmospheric Corrosion Resistance.
* **Governing Specification:** This product meets all base requirements of ASTM A808, with the mandatory application of a **supplementary sulfur restriction**, typically invoked via:
* **ASTM A6 Supplementary Requirement S18 (Maximum Sulfur Content):** Specifying a maximum sulfur limit lower than the standard 0.05% (e.g., 0.010%, 0.008%, or 0.005%).
* **Enhanced Quality Protocols:** Often ordered with additional supplementary requirements to ensure performance in demanding applications:
* **ASTM A6 S1 (Charpy V-Notch Impact Testing):** For low-temperature toughness verification.
* **ASTM A6 S5 (Fine Austenitic Grain Practice):** Standard.
* **ASTM A770 (Through-Thickness Tension Testing):** May be specified, especially for thicknesses over 1", to quantitatively verify Z-direction ductility.
* **Corrosion Resistance:** Maintains the guaranteed atmospheric corrosion resistance of standard A808: **2x that of plain carbon steel and 4x that of copper-bearing carbon steel.**
**Chemical Composition (Weight % - ASTM A808 Base with Sulfur Restriction)**
The key differentiating factor is the drastically reduced sulfur content, with other elements controlled to support the weathering performance and strength.
| Element | ASTM A808 Base Requirement | Sulfur Restricted Typical Aim |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.20% max | 0.10 - 0.16% |
| **Manganese (Mn)** | 1.35% max | 0.90 - 1.20% |
| **Phosphorus (P)** | 0.04 - 0.12% | 0.07 - 0.10% |
| **Sulfur (S)** | 0.05% max | **≤ 0.010% (often ≤ 0.008%)** |
| **Silicon (Si)** | 0.30% max | 0.15 - 0.25% |
| **Copper (Cu)** | 0.20 - 0.40% | 0.25 - 0.35% |
| **Nickel (Ni)** | 0.25 - 0.50% | 0.30 - 0.45% |
| **Chromium (Cr)** | 0.40 - 0.65% (optional) | 0.50 - 0.60% (if specified) |
| **Vanadium (V)** | 0.06% max | 0.02 - 0.05% |
| **Carbon Equivalent (C.E. IIW)** | -- | Typically 0.36 - 0.42 |
**Physical & Mechanical Properties**
The mechanical properties meet the ASTM A808 standards; the primary improvements are in ductility and toughness characteristics.
| Property | Requirement (ASTM A808) | Performance & Key Benefit of Low Sulfur |
| :--- | :--- | :--- |
| **Yield Strength (Min)** | 50 ksi (345 MPa) | 55 - 65 ksi (380 - 450 MPa) |
| **Tensile Strength** | 65 ksi (450 MPa) min | 70 - 80 ksi (483 - 552 MPa) |
| **Elongation in 2" (Min)** | 21% | 22 - 28% |
| **Charpy V-Notch Toughness** | As specified per S1. | **Improved:** Lower sulfur reduces inclusion content, leading to higher and more consistent impact energy absorption, especially at low temperatures. |
| **Through-Thickness (Z-Direction) Ductility** | Not required by base spec. | **Greatly Enhanced:** Low sulfur significantly reduces the risk of **lamellar tearing** in thick, highly restrained welded connections (e.g., T-joints, corner details). This is the primary design advantage. |
| **Atmospheric Corrosion Resistance** | 4x that of copper-bearing carbon steel. | Unaffected; maintains full weathering performance. |
| **Key Feature** | **Improved Weld Integrity & Toughness:** The combination of weathering steel performance with the enhanced resistance to weld-related cracking (lamellar tearing, HAZ cracking) and improved base metal toughness makes it ideal for critical, exposed welded structures. |
**Product Applications**
This sulfur-restricted A808 plate is specified for critical weathering steel applications where weld integrity and structural reliability are paramount, particularly in connections subject to high through-thickness stresses.
* **Fracture-Critical Bridge Members:** Thick splice plates, gusset plates, and connections in welded box girders and trusses where failure of a single weld could be catastrophic.
* **Seismic-Resistant Structures:** Moment connections in exposed steel frames (braced frames, moment frames) where weld ductility and toughness are essential for energy dissipation.
* **Heavy Industrial & Offshore Modules:** Critical welded node connections and highly restrained joints in exposed offshore topsides or plant structures.
* **Architectural Structures with Complex Welded Details:** Where aesthetic exposed steel has complex welded nodal connections that are both visually prominent and structurally critical.
* **Repair & Retrofit of Existing Weathering Steel Structures:** For splice plates and reinforcement where matching corrosion performance and ensuring weld integrity are both critical.
**Advantages & Fabrication Notes**
* **Superior Weldability and Weld Integrity:** The low sulfur content drastically reduces the risk of **solidification cracking** in the weld metal and **heat-affected zone (HAZ) liquation cracking**. It also minimizes the risk of **hydrogen-induced cracking (HIC)** and **lamellar tearing**.
* **Enhanced Toughness:** Provides more consistent and often higher Charpy impact values due to a cleaner microstructure with fewer non-metallic inclusions.
* **Maintains Weathering Performance:** All atmospheric corrosion resistance benefits of standard A808 are preserved.
* **Fabrication:** Can be welded using standard low-hydrogen procedures for weathering steels. The low sulfur content allows for greater flexibility in welding parameters and may reduce preheat requirements slightly compared to higher-sulfur steels.
* **Cost Premium:** The steelmaking process to achieve very low sulfur (e.g., ladle desulfurization) incurs a moderate cost premium over standard A808.
* **Legacy Product Note:** Bethlehem Steel offered this as a premium, solution-oriented product. Modern equivalents are readily specified by ordering **ASTM A808** with the supplementary requirement for **Maximum Sulfur Content (S18)** set at 0.010% or lower.
**Disclaimer:**
This datasheet describes the historical **Bethlehem Steel** product offering: **ASTM A808 with a Purchaser-Imposed Sulfur Restriction**. For current procurement, it is essential to specify the base standard (**ASTM A808**) and explicitly call out the supplementary requirement for maximum sulfur, e.g., **"Supplementary Requirement S18, Maximum Sulfur Content: 0.008%."** Also specify any required impact testing (S1). The Mill Test Certificate must certify that the sulfur content meets the restricted limit. While this plate significantly improves resistance to lamellar tearing, proper joint design (minimizing restraint, using balanced welds) remains a critical engineering responsibility.
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Bethlehem Steel ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, steel plate Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4687 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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Bethlehem Steel ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, steel plate Properties
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Applications of Bethlehem Steel Flange ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, Steel Flange plate
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Chemical Identifiers Bethlehem Steel Flange ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, Steel Flange plate
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Packing of Bethlehem Steel Flange ASTM A808 Sulfur Restricted 3/16 to 1-1/2 in. thick, Steel Flange plate
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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 1158 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
