ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled

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. -: ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) Product Information -:- For detailed product information, please contact sales. -: ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) Synonyms -:- For detailed product information, please contact sales. -:

ASTM A871 HSLA Steel Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) Product Information -:- For detailed product information, please contact sales. -: # **Product Introduction: ASTM A871 Grade 65 High-Strength Low-Alloy (HSLA) Steel** **ASTM A871 Grade 65** is a **hot-rolled, high-strength, low-alloy structural steel** specifically engineered to deliver **higher strength combined with improved atmospheric corrosion resistance**. Designed for the **lighter gauge range of 5-20 mm (3/16 to 3/4 in.)**, this grade provides a **minimum yield strength of 65 ksi (450 MPa)** while maintaining **corrosion resistance approximately twice that of plain carbon steel with similar copper content**. Supplied in the hot-rolled condition, it utilizes a balanced alloy system to achieve enhanced mechanical properties without requiring post-rolling heat treatment, making it ideal for weight-sensitive structural components where durability and strength are prioritized. --- ## **International Standard & Key Specifications** * **Primary Standard:** **ASTM A871/A871M** - Standard Specification for High-Strength Low-Alloy Structural Steel Plate With Improved Atmospheric Corrosion Resistance. * **Grade Variants:** Available as **Grade 65** and **Grade 65SX**. The **"SX" designation** indicates steel produced with improved sulfide shape control, enhancing through-thickness (Z-direction) ductility and resistance to lamellar tearing in critical welded joints. * **Governing Standard:** **ASTM A6/A6M** - Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling. * **Related Specifications:** * **ASTM A709/A709M** - Structural Steel for Bridges (for comparable higher-strength applications). * **AWS D1.1** - Structural Welding Code – Steel. * **Condition:** Supplied exclusively in the **hot-rolled condition**. --- ## **Chemical Composition (Weight %, max unless range is specified) - Grade 65** The composition is optimized to achieve 65 ksi yield strength while ensuring good weldability and the specified atmospheric corrosion resistance. | Element | Composition (%) | Role in Performance | | :--- | :--- | :--- | | **Carbon (C)** | 0.23 max | Provides foundational strength; controlled to manage weldability. | | **Manganese (Mn)** | 1.35 max | Primary solid-solution strengthener; critical for achieving the higher yield strength. | | **Phosphorus (P)** | 0.04 max | Contributes to atmospheric corrosion resistance. | | **Sulfur (S)** | 0.05 max (Standard & SX)* | Impurity. In SX grades, metallurgical treatment modifies sulfide inclusion morphology to improve Z-direction properties. | | **Silicon (Si)** | 0.30 max | Deoxidizer and solid solution strengthener. | | **Copper (Cu)** | **0.20 min** | **Essential alloying element.** Provides the fundamental improvement in atmospheric corrosion resistance. | | **Chromium (Cr)** | 0.40 - 0.70 | Enhances atmospheric corrosion resistance and may contribute to hardenability. | | **Nickel (Ni)** | 0.40 max | May be present to enhance toughness. | | **Vanadium (V)** | 0.02 - 0.15 (typical) | Key microalloy for precipitation strengthening, vital for reaching the 65 ksi strength level. | | **Columbium (Cb/Nb)** | 0.005 - 0.05 (optional) | Microalloy for grain refinement. | *Note for SX Grade:* The distinguishing feature is **sulfide shape control** (e.g., via calcium treatment), which transforms elongated MnS inclusions into more globular forms, significantly improving ductility in the short transverse direction. --- ## **Typical Physical & Mechanical Properties (Hot-Rolled, Thickness 5-20 mm / 3/16 to 3/4 in.)** Properties are guaranteed for hot-rolled material within this specific, lighter thickness range. | Property | Value / Description | | :--- | :--- | | **Tensile Strength** | 550 - 725 MPa (80,000 - 105,000 psi) | | **Yield Strength (min)** | **450 MPa (65,000 psi)** | | **Elongation in 2-in (50 mm) (min)** | 17% | | **Modulus of Elasticity** | ~200 GPa (29 x 10⁶ psi) | | **Density** | ~7.85 g/cm³ (0.284 lb/in³) | | **Charpy V-Notch Impact Toughness** | Not a default requirement of the base specification but can be specified via supplementary requirements for low-temperature service (e.g., testing at 0°F / -18°C or -40°F / -40°C). | | **Atmospheric Corrosion Resistance** | Approximately **2 times** greater than plain carbon steel in similar environments. | | **Through-Thickness (Z-Direction) Ductility** | **Standard Grade:** Adequate for most applications. **SX Grade:** **Superior** resistance to lamellar tearing, recommended for highly restrained T, K, and corner joints. | --- ## **Product Applications** ASTM A871 Grade 65 is specified for structural applications where maximizing strength-to-weight ratio is critical, and where enhanced atmospheric durability adds value, particularly in medium-duty to heavy-duty components. **Primary Industries and Products:** 1. **Transportation & Heavy Equipment:** * **Chassis frames, crossmembers, and subframes** for high-performance heavy-duty trucks, buses, and specialty vehicles. * **Boom arms, lift components, and structural members** for construction and agricultural machinery. * **Railcar underframes and structural components**. 2. **Material Handling & Storage:** * **High-capacity storage rack systems** (uprights and beams for heavy loads). * **Forklift masts** and **crane components**. * **Heavy-duty industrial platforms** and **work access structures**. 3. **Structural & Construction:** * **Lightweight truss members** and **bracing** for buildings and structures. * **Supporting structures** for heavy mechanical equipment. * **Components in mobile and modular structures**. 4. **Infrastructure:** * **High-strength components** for signage, lighting, and signal supports. --- ## **Advantages and Critical Fabrication Considerations** * **Advantages:** * **High Strength-to-Weight Ratio:** 65 ksi yield strength enables significant weight reduction and material efficiency in structural designs. * **Enhanced Durability:** Provides a tangible improvement in corrosion resistance over standard high-strength steels, extending the service life of painted components. * **Fabrication-Friendly:** Good weldability and formability for its strength level in the hot-rolled condition. * **Specialized SX Grade:** Offers a direct solution to prevent lamellar tearing in critical, thick-welded assemblies, even in thinner plates. * **Critical Fabrication Considerations:** * **Welding:** Due to the higher strength and alloy content, **strict low-hydrogen welding procedures are strongly recommended.** Preheat (150-250°F / 65-120°C) is often advisable, especially for the upper end of the thickness range and restrained joints. Welding consumables should match the strength (e.g., E8018 series). * **Corrosion Performance Clarification:** This steel is **not equivalent to ASTM A588 weathering steel**. Its corrosion resistance is an **enhancement for painted systems** or for use in mild environments. It will not form a stable, protective patina like dedicated weathering steels. * **Forming:** While formable, the higher strength results in greater springback and requires more force. Minimum bend radii are larger than for mild steel (typically ≥ 3x thickness for 90-degree bends across the grain). * **Thermal Effects:** Hot-dip galvanizing after fabrication may lead to some loss of yield strength due to the thermal cycle. If galvanizing is required, the potential for property alteration should be evaluated and tested. * **Grade Selection:** For fabrication involving highly restrained welds (e.g., intersecting plates), specifying the **65SX grade** is a prudent engineering decision to mitigate the risk of through-thickness cracking. **In summary, ASTM A871 Grade 65 is a high-performance HSLA steel offering an excellent balance of 65 ksi yield strength and improved atmospheric corrosion resistance in a hot-rolled, readily fabricable form. It is ideally suited for demanding applications in transportation and material handling equipment where reducing weight without compromising durability is a key design objective. The availability of the SX grade provides an additional layer of reliability for critical welded structures.** -:- For detailed product information, please contact sales. -: ASTM A871 HSLA Steel Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) Specification Dimensions Size： Diameter 20-1000 mm Length <4551 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. -: ASTM A871 HSLA Steel Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) Properties -:- For detailed product information, please contact sales. -:

Applications of ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) -:- For detailed product information, please contact sales. -: Chemical Identifiers ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) -:- For detailed product information, please contact sales. -:

Packing of ASTM A871 HSLA Steel Flange Grade 65, Hot-Rolled, 5-20 mm (3/16 to 3/4 in.) -:- 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 1022 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