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 1018, Grade 30 Hot Rolled Carbon Steel Flange, Structural Steel Flange (SS) Product Information
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AK Steel Flange ASTM A 1018, Grade 30 Hot Rolled Carbon Steel Flange, Structural Steel Flange (SS) Synonyms
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AK Steel ASTM A 1018, Grade 30 Hot Rolled Carbon Steel, Structural Steel (SS) Product Information
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**Product Name:** AK Steel ASTM A1018, Grade 30 Hot-Rolled Carbon Steel, Structural Steel (SS)
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### **1. Overview**
AK Steel's ASTM A1018 Grade 30 is a standardized, high-quality hot-rolled carbon steel sheet and strip, designed primarily for **pressure vessel and structural applications requiring improved notch toughness**. This grade is distinguished from the more general-purpose ASTM A1011 Grade 30 by its mandatory **normalization or other controlled cooling practices** after hot rolling, which imparts a more uniform, refined microstructure. The "Grade 30" designation indicates a minimum yield strength of 30 ksi (205 MPa). This steel is engineered for applications where reliability, consistency in mechanical properties, and good low-temperature performance are more critical than in standard commercial grades.
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### **2. International Standards**
This product is manufactured to meet the specific requirements of the following standard, which emphasizes improved toughness and manufacturing control:
* **ASTM A1018 / A1018M:** Standard Specification for Steel, Sheet and Strip, Heavy-Thickness Coils, Hot-Rolled, Carbon, Commercial, Drawing, Structural, High-Strength Low-Alloy, and High-Strength Low-Alloy with Improved Formability, Grade 30.
* This specification covers heavier gage coils and includes mandatory **toughness requirements** (e.g., Charpy impact testing may be specified) and mandatory **normalizing** or controlled processing.
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### **3. Chemical Composition (Typical, % by Weight)**
The chemistry is balanced to achieve the required strength and to respond well to the normalization heat treatment, ensuring good through-thickness properties.
| Element | Content (Maximum, unless specified) | Role & Implication |
| :--- | :--- | :--- |
| **Carbon (C)** | 0.18% - 0.25% (Typical range) | Provides base strength. Controlled to ensure good weldability and response to normalization. |
| **Manganese (Mn)** | 0.60% - 0.90% | Primary strengthener; enhances hardenability and aids in grain refinement during normalization. |
| **Phosphorus (P)** | 0.035% max | Residual; kept low for improved ductility and notch toughness. |
| **Sulfur (S)** | 0.035% max | Residual; controlled for weldability and to minimize anisotropy. |
| **Silicon (Si)** | 0.10% - 0.30% | Deoxidizer (typically killed steel), contributes to strength. |
| **Aluminum (Al)** | May be present (for grain refinement) | Used in killed steel practice to control grain size, which is further refined by normalization. |
| **Note:** | This is a **normalized steel**. The heat treatment refines the grain structure, homogenizes the microstructure, and relieves internal stresses from hot rolling, leading to more consistent and improved mechanical properties, especially toughness. | |
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### **4. Physical & Mechanical Properties**
Properties are guaranteed in the normalized condition, offering superior consistency compared to as-rolled grades.
| Property | Specification Minimum (ASTM A1018 Grade 30) | Typical Value / Description |
| :--- | :--- | :--- |
| **Yield Strength (min)** | 30 ksi (205 MPa) | Consistent through the thickness due to normalization. |
| **Tensile Strength** | 49 ksi min (340 MPa) | Typically ranges from 49 - 65 ksi (340 - 450 MPa). |
| **Elongation in 2" (min)** | 23% (for thickness ≥ 0.23 in.) | Good ductility, enhanced by the refined grain structure. |
| **Key Distinguishing Feature** | **Improved Notch Toughness** | The normalized microstructure provides significantly better impact resistance and lower ductile-to-brittle transition temperature than as-rolled A1011 Grade 30. Charpy V-Notch values are often specified. |
| **Microstructure** | Fine-grained ferrite-pearlite | Uniform and refined, resulting from the normalization process. |
| **Surface Finish** | Standard hot-rolled mill finish, but with more uniform scale due to controlled cooling. | |
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### **5. Key Features & Advantages**
* **Enhanced Toughness & Consistency:** The mandatory normalization process is the primary advantage, delivering reliable, uniform mechanical properties and superior resistance to brittle fracture. This is critical for safety in pressure-containing and dynamically loaded structures.
* **Excellent Weldability:** The refined, homogeneous grain structure responds well to welding, with a reduced risk of heat-affected zone (HAZ) problems compared to some as-rolled steels.
* **Good Formability:** Maintains good ductility for bending and forming operations, with properties that are more isotropic (similar in all directions) due to the heat treatment.
* **Reliable for Critical Applications:** Specifically designed and processed for applications where material integrity and predictable performance under stress are non-negotiable.
* **Better Thickness Performance:** ASTM A1018 is intended for heavier thickness coils, and normalization ensures property consistency even in thicker sections where rolling effects can be pronounced.
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### **6. Product Applications**
ASTM A1018 Grade 30 is selected for applications where material quality, toughness, and consistency outweigh pure cost considerations.
* **Pressure Vessels & Boilers:** Shells, heads, and other components for low to moderate-pressure service where code construction (e.g., ASME BPVC) often requires normalized materials.
* **Structural Applications with Toughness Requirements:** Building frames, crane runway girders, and support structures in colder climates or subject to impact loading.
* **Heavy Equipment & Machinery:** Critical frames, bases, and components in mining, agricultural, or construction machinery that require reliable performance.
* **Storage Tanks:** Fabrication of tanks for water, oil, or other non-corrosive materials where consistent properties are valued.
* **General Fabrication (Demanding):** Used where the purchaser specifies normalized steel to ensure fabrication consistency and final part performance, especially for thicker gauges.
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### **7. Fabrication & Processing Notes**
* **Descaling:** Mill scale must be removed via pickling or abrasive blasting prior to critical welding or painting.
* **Forming:** Excellent for cold bending and forming. The normalized condition provides predictable springback and reduced risk of cracking.
* **Welding:** Highly weldable using all common processes (SMAW, GMAW, FCAW, SAW). No preheat is typically required for thin to moderate sections. The normalized grain structure in the base metal contributes to a tougher HAZ.
* **Post-Weld Heat Treatment (PWHT):** Generally not required for this grade after welding, unless specified by a governing code for very thick sections or severe service conditions. The steel is already in a stable, stress-relieved condition.
* **Machining:** Normalization provides a uniform hardness, resulting in consistent and good machinability.
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**Disclaimer:**
*This description is for informational purposes. AK Steel is now part of Cleveland-Cliffs Inc.*
For all engineering, design, and procurement, it is essential to consult the latest official **ASTM A1018** standard and the certified **Mill Test Report (MTR)** from the manufacturer. The MTR will confirm the heat treatment (normalized) and report actual chemistry and mechanical properties, including any specified impact test results. This grade is often specified by **purchasing to a specific ASTM standard and grade**, rather than by generic name.
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AK Steel ASTM A 1018, Grade 30 Hot Rolled Carbon Steel, Structural Steel (SS) Specification
Dimensions
Size：
Diameter 20-1000 mm Length <4589 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 1018, Grade 30 Hot Rolled Carbon Steel, Structural Steel (SS) Properties
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Applications of AK Steel Flange ASTM A 1018, Grade 30 Hot Rolled Carbon Steel Flange, Structural Steel Flange (SS)
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Chemical Identifiers AK Steel Flange ASTM A 1018, Grade 30 Hot Rolled Carbon Steel Flange, Structural Steel Flange (SS)
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Packing of AK Steel Flange ASTM A 1018, Grade 30 Hot Rolled Carbon Steel Flange, Structural Steel Flange (SS)
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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 1060 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
